CN102118052B - Power supply management system - Google Patents
Power supply management system Download PDFInfo
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- CN102118052B CN102118052B CN2011100510759A CN201110051075A CN102118052B CN 102118052 B CN102118052 B CN 102118052B CN 2011100510759 A CN2011100510759 A CN 2011100510759A CN 201110051075 A CN201110051075 A CN 201110051075A CN 102118052 B CN102118052 B CN 102118052B
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Abstract
The invention provides a power supply management system which comprises a charging circuit, a battery, a main voltage converter and an auxiliary voltage converter, wherein the charging circuit is positioned between a charging node and a power supply node; and the charging circuit is used for comparing the voltage of the charging node with the voltage of the battery, when the voltage of the battery is higher than that of the charging node, the battery supplies power to the power supply node through the main voltage converter, and when the voltage of the battery is lower than that of the charging node, the charging node supplies power to the power supply node through the auxiliary voltage converter.
Description
[technical field]
The present invention relates to circuit field, particularly relate to a kind of power-supply management system.
[background technology]
In many battery powered mancarried electronic aids, generally adopt a rechargeable battery to provide main power source for system, can realize that like this when not having external power source, system can work.When dead battery, can charge to battery by external power source.Now, increasing consumption demand wish to realize when cell voltage excessively low, can't be system power supply, but when existing external power source that battery is charged, system can work still, at this moment need by from the external power source power taking with to system power supply.
As shown in Figure 1, it shows a kind of existing power supply management system, and it comprises and is arranged on external power source and is powered charging circuit, battery Bat and voltage conversion circuit between the system.Take by described battery as example as lithium battery, when cell voltage is down to below the 2.9V, the protection chip of lithium battery interior will be forbidden discharge, can't provide power supply for the outside.In order to prevent misoperation under the low-voltage, when lithium battery forces down when certain value (such as 3.2V), generally can stop the work of the system that is powered.If cell voltage is 2.5V, even external power source connects, described charging circuit is described battery charging, but this moment, the VB node voltage can be clamped down in 2.5V by battery, and the system of being powered can't work.If the voltage that described charging circuit is forced VB is ordered rises to the required operating voltage of the system of being powered, such as 3.2V, then need excessive charging current, such charged electrical fails to be convened for lack of a quorum and damages charging circuit and battery.
Fig. 2 shows the existing power supply management system that can address the above problem, it adopts power management chip bq24070 to realize, wherein said power management chip is arranged at described power supply adaptor (AC Adapter) and is powered between the system (System), at cell voltage be powered and omitted voltage conversion circuit between the system.Can find out, battery BAT is connected with the system of being powered by switch Q2, like this can be when cell voltage be relatively lower, such as being 2.5V, described power management chip still can maintain the voltage of its output OUT more than the 3.2V, to guarantee the normal operation of the system that is powered, this moment, described switch Q2 played the effect of a dropping resistor so that the voltage of the input of battery BAT still can remain on 2.5V, so also can guarantee charging normal of described battery.Yet, be described when being powered system power supply at described battery, supply current can form certain loss at described switch Q2, and in order to reduce the efficiency losses of this switch Q2, the conducting resistance of the switch Q2 among the charging management chip bq24070 is designed to 40 milliohms.The loss power of this switch is I so
2.R
ON, wherein I is powered the required electric current that flows out from battery of system works, R
ONConducting resistance for switch Q2.In custom integrated circuit technique, a common encapsulation gold thread also has the resistance of 50 milliohms, therefore the resistance of 40 milliohms is too little concerning custom integrated circuit technique, the chip area that the switch of the conducting resistance that realization is so little needs is very large, cost is very high, even in the application of some small size chips, can't compatible compact package.In the 5V technique for conventional cmos 0.5um, the PMOS switch of 0.2 ohm of conducting resistance of realization needs the chip area of 850um * 350um.Because conducting resistance is inversely proportional to required chip area, the switch of described 40 milliohms will need at least 5 times above-mentioned area, and the gold thread resistance that connects essential metallic resistance and encapsulation does not also count.So it is fully-integrated unrealistic that this scheme realizes for custom integrated circuit technique.Even this conducting resistance is very little, but still can consume I
2.R
ONPower consumption.
Therefore, be necessary to propose a kind of new technical scheme and solve the problems referred to above.
[summary of the invention]
The purpose of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit to avoid making the purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used for limiting the scope of the invention.
The object of the present invention is to provide a kind of power-supply management system, it can be eliminated and be connected on battery to being powered in the system because of the required switch of switching, realizes simply, and can reduce power consumption.
According to goal of the invention of the present invention, the invention provides a kind of power-supply management system, it comprises the charging circuit between charge node and supply node, battery, principal voltage transducer and other electric pressure converter, wherein said charging circuit compares the voltage of described charge node and the voltage of described battery, at the voltage of described battery during greater than the voltage of described charge node, so that described battery is described supply node power supply by described principal voltage transducer, at the voltage of described battery during less than the voltage of described charge node, so that described charge node is described supply node power supply by described other electric pressure converter.
Further, at the voltage of described battery during less than the voltage of described charge node, simultaneously so that described charge node by the described battery charging of being controlled to be of described charging circuit.
Further, when large first scheduled voltage of voltage of the described charge node of voltage ratio of described battery, just so that described battery is described supply node power supply by described principal voltage transducer, when little second scheduled voltage of voltage of the described charge node of voltage ratio of described battery, just so that described charge node is described supply node power supply by described other electric pressure converter.
Further, described other electric pressure converter has the reverse current cutoff function.
Further, described principal voltage transducer also has the reverse current cutoff function.
Further, described charging circuit comprises charger detection circuit, reverser, charge controller, the first switching transistor, second switch transistor and the 3rd switching transistor, described charger detection circuit compares the voltage of described charge node and the voltage of described battery, its output links to each other with the Enable Pin of described principal voltage transducer, its output links to each other with the Enable Pin of other electric pressure converter through behind the described reverser, described the first switching transistor and second switch strings of transistors are associated between charge node and the battery, the control end of described the first switching transistor and the output of described charger detection circuit join, and the output of the transistorized control end of described second switch and described reverser joins; Described the 3rd switching transistor is connected between charge node and the battery, its control end is connected with the output of described charge controller, and described charge controller is controlled the control end of described the 3rd switching transistor according to the voltage of the voltage of described charge node and described battery.
Further, described power-supply management system also comprises a comparator, the described battery of one of them input termination, another input termination reference voltage, its output is connected with an input of a logical circuit, the output of the reverser in the described charging circuit is connected with another input of described logical circuit, and the output of described logical circuit links to each other the voltage of a little higher than described supply node of described reference voltage with the Enable Pin of described other electric pressure converter.
Further, described logical circuit is AND circuit.
Further, described principal voltage transducer is voltage descending DC-DC converter or linear voltage regulator, and described other electric pressure converter is voltage descending DC-DC converter or the linear voltage regulator with reverse current cutoff function.
Further, described voltage descending DC-DC converter or linear voltage regulator adopt NMOS or PMOS as power tube.
Compared with prior art, the present invention is provided with the two-way electric pressure converter, i.e. other electric pressure converter and principal voltage transducer are in the situation that have external power supply and cell voltage lower, for being powered system power supply, external power supply charges to battery external power supply simultaneously via other electric pressure converter; In the situation that without external power supply, battery for being powered system power supply, is connected on battery to be powered in system because of switching required switch thereby eliminated via the principal voltage transducer, has so also just eliminated the power consumption that causes because of described switch.
[description of drawings]
In order to be illustrated more clearly in the technical scheme of the embodiment of the invention, the accompanying drawing of required use was done to introduce simply during the below will describe embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.Wherein:
Fig. 1 is the structural representation of existing power supply management system;
Fig. 2 is with the structural representation of the power-supply management system of diverter switch in the prior art;
Fig. 3 is power-supply management system circuit diagram in one embodiment among the present invention;
Fig. 4 is the other electric pressure converter schematic diagram in one embodiment among the present invention, the linear voltage regulator that wherein said other electric pressure converter ends for the reverse current with NMOS power pipe;
Fig. 5 is the principal voltage transducer schematic diagram in one embodiment among the present invention, the voltage descending DC-DC converter (DC-DC Converter) that wherein said principal voltage transducer ends for the reverse current with NMOS power pipe;
Fig. 6 is the other electric pressure converter schematic diagram in another embodiment among the present invention, and wherein said other electric pressure converter is realized for the linear voltage regulator that the reverse current with PMOS power pipe ends;
Fig. 7 is the principal voltage transducer schematic diagram in another embodiment among the present invention, and wherein said principal voltage transducer is the DC-to-DC converter realization with the cut-off reverse current of PMOS power pipe;
Fig. 8 is principal voltage transducer and the schematic diagram of other electric pressure converter in another embodiment among the present invention, and wherein principal voltage transducer and other electric pressure converter all are the DC-to-DC converter with NMOS power pipe;
Fig. 9 is principal voltage transducer and other electric pressure converter schematic diagram in another embodiment among the present invention, and wherein principal voltage transducer and other electric pressure converter all are the DC-to-DC converter with NMOS power pipe; With
Figure 10 is power-supply management system circuit diagram in another embodiment among the present invention.
[embodiment]
Detailed description of the present invention is mainly come the running of direct or indirect simulation technical solution of the present invention by program, step, logical block, process or other symbolistic descriptions.Be the thorough the present invention that understands, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the present invention then may still can realize.Affiliated those of skill in the art use herein these descriptions and statement essential to the work that the others skilled in the art in the affiliated field effectively introduce them.In other words, be the purpose of the present invention of avoiding confusion, because the easily understanding of the method for knowing and program, so they are not described in detail.
Alleged " embodiment " or " embodiment " refer to be contained in special characteristic, structure or the characteristic at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.In addition, represent the sequence of modules in method, flow chart or the functional block diagram of one or more embodiment and revocablely refer to any particular order, also be not construed as limiting the invention.
The invention provides a kind of power-supply management system, it is provided with the two-way electric pressure converter, be respectively other electric pressure converter and principal voltage transducer, in the situation that have external power supply and cell voltage lower, for being powered system power supply, external power supply charges to battery external power supply simultaneously via other electric pressure converter; In the situation that without external power supply, battery for being powered system power supply, is connected on battery to be powered in system because of switching required switch thereby eliminated via the principal voltage transducer, has so also just eliminated the power consumption that causes because of described switch.
Fig. 3 is power-supply management system circuit diagram in one embodiment among the present invention, described power-supply management system 300 comprises charging circuit 310, battery 320, other electric pressure converter 330 and the principal voltage transducer 340 between charge node VCHG and supply node VS, described principal voltage transducer 340 is connected between battery 320 and the supply node VS, and described other electric pressure converter 330 is connected between charge node VCHG and the supply node VS.Described other electric pressure converter 330 and described principal voltage transducer 340 are has the reverse current cutoff function, thereby can avoid when utilizing one of them electric pressure converter to power, electric current oppositely carries out undesired charging by another electric pressure converter to described battery.
Described charging circuit 310 comprises charger detection circuit, reverser, charge controller, the first switching transistor PM1, second switch transistor PM2 and the 3rd switching transistor PM3, and it is used for the control external power source to the charging of battery and selects described principal voltage transducer and other electric pressure converter one to carry out voltage transitions and think that the system of being powered powers.
Described charger detection circuit compares the voltage of described charge node VCHG and the voltage VB of described battery, its output links to each other with the Enable Pin of described principal voltage transducer 340, its output links to each other with the Enable Pin of other electric pressure converter 330 through behind the described reverser, described the first switching transistor PM1 and second switch transistor PM2 are connected between charge node CVHG and the battery 320, the control end of described the first switching transistor PM1 links to each other with the output of described charger detection circuit, and the control end of described second switch transistor PM2 links to each other with the output of reverser; Described the 3rd switching transistor PM3 is connected between described charge node VCHG and the battery 320, its control end is connected with the output of described charge controller, and described charge controller is controlled the control end of described the 3rd switching transistor PM3 according to the voltage of the voltage of described charge node VCHG and described battery 320.
Wherein at the voltage of described battery during greater than the voltage of described charge node VCHG, the described principal voltage transducer 340 of the output enable of described charger detection circuit, described principal voltage transducer 340 carry out voltage transformation according to the voltage of described battery and think that the described system that is powered powers; At the voltage of described battery during less than the voltage of described charge node VCHG, the described other electric pressure converter 330 of the output enable of described charger detection circuit, described other electric pressure converter 330 carry out voltage transformation according to the voltage of charge node VCHG and think the described system power supply that is powered.
In a preferred embodiment, described charger detection circuit can select the hysteresis comparator to realize, it is when large first scheduled voltage of voltage of the described charge node of voltage ratio of described battery, its output just upset is effective enable signal BAT_EN, when little second scheduled voltage of voltage of the described charge node of voltage ratio of described battery, its output just upset is invalid enable signal BAT_EN, wherein the first scheduled voltage and the second scheduled voltage can be identical can be not identical yet.Use in the example at one, if the voltage of charge node is VCHG, cell voltage is VB, when VB＞(VCHG+ Δ V), the output switching activity of described charger detection circuit becomes high level (effectively enabling level), enables described principal voltage transducer, the described other electric pressure converter of disable; When VB＜(VCHG-Δ V), the output switching activity of described charger detection circuit becomes low level (the invalid level that enables), the described principal voltage transducer of disable enables described other electric pressure converter, can effectively prevent system oscillation when Δ V chooses when more reasonable.Δ V can be set as 100mV in one embodiment, can adjust Δ V according to requirement in practical systems.Delayed comparator has a lot of existing implementations, is not described in detail herein.
When operation, when large first scheduled voltage of voltage of the described charge node of voltage ratio of described battery, show and do not have external power supply access charge node VCHG, described charger detection circuit output high level, it is controlled the first switching transistor PM1 and disconnects, and make second switch transistor PM2 conducting, enable described principal voltage transducer 340, the described other electric pressure converter 330 of disable, described principal voltage transducer 340 carries out voltage transformation according to the voltage of described battery and thinks that the described system that is powered powers, described other electric pressure converter 330 has the reverse current cutoff function, thereby can prevent that the electric current reverse flow from crossing described other electric pressure converter 330.When little second scheduled voltage of voltage of the described charge node of voltage ratio of described battery, show external power supply access charge node VCHG is arranged, described charger detection circuit output low level, it controls the first switching transistor PM1 conducting, and second switch transistor PM2 is disconnected, the 3rd switching transistor PM3 conducting, the described principal voltage transducer 340 of disable, enable described other electric pressure converter 330, described other electric pressure converter 330 carries out voltage transformation according to the voltage of described charge node and thinks that the described system that is powered powers, the voltage of described charge node charges normal described battery by described the 3rd switching transistor PM3 simultaneously, described principal voltage transducer 340 has the reverse current cutoff function, thereby can prevent that the electric current reverse flow from crossing described principal voltage transducer 340.
Described other electric pressure converter 330 optional usefulness have voltage descending DC-DC converter (buck DC-DC Converter) or the linear voltage regulator (linear regulator) of reverse current cutoff function.Described principal voltage transducer 340 also optional usefulness has voltage descending DC-DC converter or the linear voltage regulator of reverse current cutoff function.In a preferred embodiment, described principal voltage transducer 340 is voltage descending DC-DC converter, although also can be consisted of by linear voltage regulator, but linear voltage regulator is lower than the efficient of voltage descending DC-DC converter, for portable electric appts, voltage descending DC-DC converter can realize that the worker after longer each charging does the time especially.Realize for other electric pressure converter 330 preferred linear voltage regulators, be conducive to like this save cost, and when usually powering with charger, relatively poor power supply conversion efficiency is acceptable to portable electric appts.
The below will introduce several examples of the specific implementation of principal voltage transducer 340 and other electric pressure converter 330 in detail.
Fig. 4 is other electric pressure converter 400 schematic diagram in one embodiment among the present invention, the linear voltage regulator that wherein said other electric pressure converter ends for the reverse current with NMOS power pipe.Described other electric pressure converter 400 also includes an error amplifier EA, a NMOS pipe MNL1, the 2nd NMOS pipe MNL2, reverser INV2, the first resistance R 1 and the second resistance R 2.The drain electrode of described NMOS pipe MNL1 among the figure can be used as charge node VCHG, it can connect external power supply, node between the first NMOS pipe MNL1 and the first resistance R 1 can be used as the VS node, described VS node connects the described system that is powered, the input of reverser INV2 is as the Enable Pin CHG_EN of described other electric pressure converter 400, and described Enable Pin CHG_EN connects the output of the reverser of described charging circuit 310.This side electric pressure converter 400 has selected NMOS as power tube, has the simple advantage of stabiloity compensation because NMOS does the implementation of power output pipe, because its output impedance is lower, the limit of output contact can be pushed away as far as high band; And because the substrate ground connection of NMOS, to can automatic cut-off from the reverse current of output (electric current that flows into from the VS node), need not special circuit.
Fig. 5 is principal voltage transducer 500 schematic diagram in one embodiment among the present invention, the voltage descending DC-DC converter (DC-DC Converter) that wherein said principal voltage transducer ends for the reverse current with NMOS power pipe.Described principal voltage transducer 500 comprises DC-DC control circuit, the first transistor MNS1, transistor seconds MNS2, inductance L 1, capacitor C 1, the first resistance R 1 and the second resistance R 2, the drain electrode of wherein said transistor MNS1 can connect the voltage VB of described battery, signal BAT_EN by charger detection circuit output can link to each other with the Enable Pin of described DC_DC control circuit, the one output control the first transistor MNS1 of DC_DC control circuit, another output control transistor seconds MNS2, MNS1 and MNS2 series connection; One end of inductance L 1 is connected on the node between MNS1 and the MNS2, and the other end of inductance L 1 connects described supply node VS, and this node links to each other with the system of being powered; One end of capacitor C 1 is connected on the node between inductance and the VS node, and the other end is connected to the source electrode of transistor seconds MNS2; The first resistance R 1 and the second resistance R 2 are connected between the node and ground between capacitor C 1 and the VS; Node in the middle of resistance R 1 is connected with resistance R is connected with the DC-DC control circuit.Here the transistor MNS1 in the principal voltage transducer 500 and MNS2 all select the NMOS pipe as power tube, so also can the automatic cut-off because of the substrate ground connection of the first transistor MNS1, transistor seconds MNS2 by the reverse current of VS input.
Fig. 6 is other electric pressure converter 600 schematic diagram in another embodiment among the present invention, and wherein said other electric pressure converter is realized for the linear voltage regulator that the reverse current with PMOS power pipe ends.Described other electric pressure converter 600 comprises error amplifier EA, the first transistor PML4, transistor seconds PML5, the 3rd transistor PML6, the 4th transistor PML7, reverser INVL2, the first resistance R L3 and the second resistance R L4, wherein the source electrode of the first transistor PML4, transistor seconds PML5 with as charge node VCHG, wherein said VCHG node can connect external power supply; The input of reverser INVL2 can be used as the Enable Pin CHG_EN of described bypass electric pressure converter, and its output is connected with the grid of transistor seconds PML5; The input of error amplifier EA is respectively reference voltage VREF, and its output is connected with the grid of the 3rd transistor PML6; The source electrode of the 3rd transistor PML6 is connected with external power source VCHG, and its drain electrode is connected with the end of the first resistance R L3; The source electrode of the 4th transistor PML7 is connected with the drain electrode of transistor seconds PML5, and its grid is connected with the CHG_EN end, and its drain electrode is connected with the drain electrode of the 3rd transistor PML6; Be connected with node VS between the drain electrode of the 3rd transistor PML6 and the first resistance R L3; The second resistance R L4 is connected between the first resistance R L3 and the ground; Node between the first resistance R L3 and the second resistance R L4 is connected with another input of error amplifier EA.If VCHG's is low level, connect the substrate switching that to pass through between the first transistor PML4, transistor seconds PML5, the 3rd transistor PML6, the 4th transistor PML7 so that from charge node VCHG to the single line conducting the VS, realize from the cut-off of the reverse current of VS input.
Fig. 7 is the principal voltage transducer schematic diagram in another embodiment among the present invention, and wherein said principal voltage transducer is the DC-to-DC converter realization with the cut-off reverse current of PMOS power pipe.Described principal voltage transducer 700 comprises DC-DC control circuit, the first transistor PMS3, transistor seconds PMS4, the 3rd transistor PMS5, the 4th transistor MNS4, reverser INVL2, inductance L 1, capacitor C 1, the first resistance R 1 and the second resistance R 2, wherein the VB node is connected with battery, the VS node is connected with the system of being powered, and the signal AT_EN that is exported by charger detection circuit can link to each other with the Enable Pin of described DC_DC control circuit; The source electrode of the first transistor PMS3, transistor seconds PMS4 is connected with the voltage VB of battery; The grid of the first transistor PMS3 is connected with the output of DC_DC control circuit, and its drain electrode is connected with the source electrode of the 4th transistor MNS4; The grid of transistor seconds PMS4 is connected with the output of reverser INVL2, and its drain electrode is connected with the source electrode of the 3rd transistor PMS5; The input of reverser INVL2 is connected with the BAT_EN end; The drain electrode of the 3rd transistor PMS5 is connected with the drain electrode of the first transistor PMS3; Inductance L 1 is connected between transistor PMS3 drain electrode and the VS node; Capacitor C 1 is connected between the source electrode of inductance L 1 and the 4th transistor MNS4; The first resistance R 1 and the second resistance R 2 are connected between VS and the ground; The first resistance R 1 be connected resistance R 2 node in connecting and be connected with the DC_DC control circuit.Wherein the first transistor PMS3, transistor seconds PMS4, the 3rd transistor PMS5 all select the PMOS pipe, the 4th transistor MNS4 is the NMOS pipe, utilize the switching between the first transistor PMS3, transistor seconds PMS4, the 3rd transistor PMS5 substrate so that from battery output VB to single line conducting the supply node VS, realize from supply node VS through the cut-off of described principal voltage transducer 700 to the reverse current of battery input.
Fig. 8 is principal voltage transducer and the schematic diagram of other electric pressure converter in another embodiment among the present invention, wherein principal voltage transducer and other electric pressure converter all are that wherein principal voltage transducer and other electric pressure converter have been shared low-end switch device MNS35, inductance L 31, output capacitance C31, feedback resistance R1 and R2 with the DC-to-DC converter of NMOS power pipe.Adopt the NMOS pipe to do the reverse current that end switch can end both direction.
Fig. 9 is principal voltage transducer and other electric pressure converter schematic diagram in another embodiment among the present invention, wherein principal voltage transducer and other electric pressure converter all are the DC-to-DC converter with NMOS power pipe, wherein the upper end switch of principal voltage transducer and other electric pressure converter all is the PMOS pipe, adopts the substrate commutation circuit to realize the reverse current cut-off of both direction.
The concrete structure of circuit sees also shown in the figure among Fig. 8 and Fig. 9, just describes in detail no longer one by one here.
The connection that the above-mentioned voltage descending DC-DC converter with reverse current cutoff function of saying is connected with linear voltage regulator in the power-supply management system 300 is that those of ordinary skill can be realized, except the above-mentioned various transducers that provide, certainly can utilize other reducing transformers with negative function to realize.
Power-supply management system of the present invention can also be realized by another mode.See also shown in Figure 10, power-supply management system circuit diagram in another embodiment among the present invention, described power-supply management system 1000 comprises charging circuit 1010, battery 1020, other electric pressure converter 1030 and the principal voltage transducer 1040 that is connected between charge node and the supply node, the structure (except the charging circuit 1010) of the power-supply management system among above-mentioned each element or circuit difference Fig. 3 is identical, for fear of burden, just no longer tell about here.
The difference of the power-supply management system 300 among described power-supply management system 1000 and Fig. 3 is: the power-supply management system 1000 in the present embodiment also comprises a comparator 1050, a described battery of input termination of described comparator 1050, another input termination reference voltage, its output is connected with an input of a logical circuit 1060, the output of the inverter in the described charging circuit 1010 is connected with another input of described logical circuit 1060, the output of described logical circuit 1060 links to each other with the Enable Pin CHG_EN of described other electric pressure converter, the enabled state of the described other electric pressure converter 1030 of described Enable Pin CHG_EN control.Described comparator 1050 switches the use between other electric pressure converter 1030 and the principal voltage transducer 1040 for auxiliary.Principal voltage transducer 1040 only needed to use common voltage descending DC-DC converter or linear voltage regulator and did not need to have reverse cutoff function this moment.
In one embodiment, the positive input of described comparator 1050 connects the voltage VB of battery, reverse input end connects reference voltage Vref, usually the voltage of supply node VS added certain threshold value under reference voltage Vref was set to and works, and prevented like this because the offset voltage of comparator 1170 leads to errors.Voltage such as supply node VS is 1.2V, and reference voltage Vref can be set to 1.3V.As the voltage VB of battery during greater than 1.3V, other electric pressure converter 1030 just may be enabled.If cell voltage VB is less than 1.3V, then other electric pressure converter 1030 can not be enabled.
As from the foregoing, described logical circuit can be an AND circuit.In one embodiment, when the voltage VB of battery than the voltage VB of little second scheduled voltage of voltage of charge node and battery during greater than reference voltage Vref, the signal of charger detection circuit output is high level (being that YM_EN is high level) after reverser is reverse, and the signal BYP_EN of comparator 1050 outputs also is high level, the output of described AND circuit then is high level, Enable Pin CHG_EN just enables other electric pressure converter 1030 like this, other electric pressure converter 1030 allows the charge node be the power supply of supply node place, this moment since the voltage of supply node VS less than cell voltage, therefore described principal voltage transducer 1040 can not have the reverse current cutoff function.At the voltage of described supply node during greater than cell voltage, be that battery carries out improper charging for fear of supply node, can utilize comparator relatively cell voltage and reference voltage, this moment, the comparator output low level just no longer enabled other electric pressure converter 1030 like this after AND circuit.
The linear voltage regulator that other electric pressure converter 1030 in the described power-supply management system 1000 can use the voltage descending DC-DC converter with reverse current cut-off function or have reverse current cut-off function, described principal voltage transducer 1040 can use common voltage descending DC-DC converter or linear voltage regulator.Wherein having the voltage descending DC-DC converter of reverse current cutoff function or have the linear voltage regulator of reverse current cut-off function can be directly referring to described above, and common voltage descending DC-DC converter or linear voltage regulator also to be those of ordinary skill in the art can both realize, just no longer describe in detail here.
In sum, the present invention has realized utilizing simultaneously external power supply to being powered system power supply external power supply being arranged constantly to described battery charging by the switching to other electric pressure converter and principal voltage transducer; Realize that without external power supply the time battery is to being powered the power supply of system.Prevented simultaneously the damage of reverse current to battery, construct very simple, and the high power consumption phenomenon when having avoided switching in the prior art.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present invention does not all break away from claims of the present invention.Correspondingly, the scope of claim of the present invention also is not limited only to previous embodiment.
Claims (9)
1. power-supply management system, charging circuit, battery, principal voltage transducer and other electric pressure converter that it comprises between charge node and supply node is characterized in that:
Described charging circuit compares the voltage of described charge node and the voltage of described battery, at the voltage of described battery during greater than the voltage of described charge node, so that described battery is described supply node power supply by described principal voltage transducer, at the voltage of described battery during less than the voltage of described charge node, so that described charge node is described supply node power supply by described other electric pressure converter
Described charging circuit comprises charger detection circuit, reverser, charge controller, the first switching transistor, second switch transistor and the 3rd switching transistor, described charger detection circuit compares the voltage of described charge node and the voltage of described battery, its output links to each other with the Enable Pin of described principal voltage transducer, its output links to each other with the Enable Pin of other electric pressure converter through behind the described reverser, described the first switching transistor and second switch strings of transistors are associated between charge node and the battery, the control end of described the first switching transistor and the output of described charger detection circuit join, and the output of the transistorized control end of described second switch and described reverser joins; Described the 3rd switching transistor is connected between charge node and the battery, its control end is connected with the output of described charge controller, and described charge controller is controlled the control end of described the 3rd switching transistor according to the voltage of the voltage of described charge node and described battery.
2. power-supply management system according to claim 1 is characterized in that: at the voltage of described battery during less than the voltage of described charge node, simultaneously so that described charge node by the described battery charging of being controlled to be of described charging circuit.
3. power-supply management system according to claim 1, it is characterized in that: when large first scheduled voltage of voltage of the described charge node of voltage ratio of described battery, just so that described battery is described supply node power supply by described principal voltage transducer, when little second scheduled voltage of voltage of the described charge node of voltage ratio of described battery, just so that described charge node is described supply node power supply by described other electric pressure converter.
4. power-supply management system according to claim 1 is characterized in that: described other electric pressure converter has the reverse current cutoff function.
5. power-supply management system according to claim 4, it is characterized in that: described principal voltage transducer also has the reverse current cutoff function.
6. power-supply management system according to claim 1, it is characterized in that: described power-supply management system also comprises a comparator, the described battery of one of them input termination, another input termination reference voltage, its output is connected with an input of a logical circuit, the output of the reverser in the described charging circuit is connected with another input of described logical circuit, the output of described logical circuit links to each other the voltage of a little higher than described supply node of described reference voltage with the Enable Pin of described other electric pressure converter.
7. power-supply management system according to claim 6, it is characterized in that: described logical circuit is AND circuit.
8. arbitrary described power-supply management system according to claim 1-5, it is characterized in that: described principal voltage transducer is voltage descending DC-DC converter or linear voltage regulator, and described other electric pressure converter is voltage descending DC-DC converter or the linear voltage regulator with reverse current cutoff function.
9. power-supply management system according to claim 8 is characterized in that: described voltage descending DC-DC converter or linear voltage regulator adopt NMOS or PMOS as power tube.
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| TWI508413B (en) * | 2014-04-15 | 2015-11-11 | Quanta Comp Inc | Computer system and power management method thereof |
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| CN102593881B (en) * | 2011-11-14 | 2014-07-09 | 深圳市海思半导体有限公司 | Charging power supply circuit, method and application apparatus |
| CN102664435B (en) * | 2012-05-04 | 2014-05-28 | 无锡中星微电子有限公司 | Charging management circuit |
| CN103825341A (en) * | 2014-03-21 | 2014-05-28 | 深圳天源中芯半导体有限公司 | Battery power indicating circuit for mobile power supply |
| CN105652105A (en) * | 2014-11-14 | 2016-06-08 | 神讯电脑(昆山)有限公司 | Test circuit of vehicle-mounted charger |
| CN107069890A (en) * | 2017-06-02 | 2017-08-18 | 江苏万邦微电子有限公司 | A kind of power-supply management system of single-chip portable electronic |
| CN110334048A (en) * | 2019-07-17 | 2019-10-15 | 陕西千山航空电子有限责任公司 | A kind of Strong Impact Loading wireless collection storage circuit |
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