CN104158233A - Determination method for charging ending point - Google Patents
Determination method for charging ending point Download PDFInfo
- Publication number
- CN104158233A CN104158233A CN201310176161.1A CN201310176161A CN104158233A CN 104158233 A CN104158233 A CN 104158233A CN 201310176161 A CN201310176161 A CN 201310176161A CN 104158233 A CN104158233 A CN 104158233A
- Authority
- CN
- China
- Prior art keywords
- charging
- pulse width
- rechargeable battery
- utilize
- battery unit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention relates to a determination method for a charging ending point. The method comprises that a power input unit converts input power supply into voltage dividing power supply and output power supply; a PWM (Pulse Width Modulation) drive controller receives the voltage dividing power supply, generates PWM drive signals, and controls a switching transistor to generate charging current; conduction of the charging current is carried out by a charging inductor to charge a chargeable battery unit; the chargeable battery unit is connected with a sensing resistor and thus grounded; the PWM drive controller adjusts the working width of the PWM drive signals according to the sensing voltage of the sensing resistor; and the PWM drive controller compares the working width with a preset width and determines whether the present working width is lower than the preset width to end a charging operation. Thus, whether charging is completed or not can be accurately determined needless of using a high-sensitivity high-gain complex amplifier.
Description
Technical field
The present invention has the determination methods about a kind of end point of charging, especially in the time determining voltage low current charge, utilize working width that pulse width modulation driving governor judges pulse width modulating signal whether lower than predetermined width to determine charging end point.
Background technology
Many hand-hold types or portable electronic installation, such as wrist-watch, mobile phone, pen electricity (mobile computer), flat computer, remote controller, radio-tape recorder, walkman, recording pen, camera, cannot use the civil power that price is low be used as power supply and operate, but need volume little, lightweight, have suitable electric weight and quite just the battery of property so that required electric power to be provided, such as the carbon zinc battery of disposable battery, alkaline battery, mercury battery, or the nickel-cadmium cell of rechargeable battery, Ni-MH battery, lithium battery, lithium Fe battery, wherein rechargeable battery has and can repeatedly charge, the repetitive cycling operating characteristic of electric discharge, not only can reduce discarded object, also there is suitable carbon reduction effect simultaneously, therefore, become the main power source of above-mentioned electronic installation, especially mobile phone, pen electricity, flat computer.
According to the electrochemical properties of rechargeable battery, general charging procedure can comprise constant-current charge, constant-voltage charge, low current charge etc. step, uses and shortens the charging interval, improves chargeable amount simultaneously as far as possible.But rechargeable battery is in when charging, especially lithium is battery, must avoid overcharging, otherwise may occur overheated, produce high activity material (such as hydrogen) and cause and damage or even on fire from explosion.Therefore, be responsible for the charger of charging and conventionally need to detect battery and whether reach the full degree of filling, and filling when full, stop charging, with the danger that prevents from overcharging.
In the prior art, whether to fill the simplest and normal full means that use are current sense modes to detecting battery.Particularly, use sense measuring resistance is serially connected in switching transistor, allows the On current of switching transistor flow through sensing resistor, and mat control circuit is detected the sensing voltage in sensing resistor and determined the full degree of filling of battery.But, on side circuit, be generally to use as far as possible very small resistor, to avoid the waste of power consumption, therefore current sensor and sensing voltage are very low.Especially approach and fill when full at battery, current sensor can be lower, makes sensing voltage too low and be not easy accurate detecting, may cause the erroneous judgement of charging end point, such as too early finishing and charge volume deficiency, or finishes too late and overcharge, and even affects fail safe.
The prior art solution of the problems referred to above is the analogue amplifiers that use high sensitivity and high-gain, configurable in control circuit, in order to the small sensing voltage of accurate amplification, this not only can cause cost to increase, and also because being easily subject to the interference of electric circumstance around, this class A amplifier A affects electrical characteristic, greatly increase the degree of difficulty on entity circuit layout, even cannot specific implementation.
Therefore, need a kind of determination methods of the end point of charging, can approach in rechargeable battery unit and fill while satisfying, accurately judge the end point of charging and stop further charging, avoid rechargeable battery unit charge volume not enough or overcharged and damage, raising can utilize electric weight and improve fail safe, uses the problem that solves above-mentioned prior art.
Summary of the invention
Main purpose of the present invention is to provide a kind of determination methods of the end point of charging, to carry out in the constant-voltage charge after constant-current charge, wherein in the time of constant-voltage charge, charged electrical fails to be convened for lack of a quorum and fills gradually full reduction with rechargeable battery, therefore determination methods of the present invention comprises: utilize power input unit to receive input power, and process and generation dividing voltage supply and out-put supply through dividing potential drop and filtering, supply respectively pulse width modulation (Pulse Width Modulation, PWM) driving governor and switching transistor; Utilize PWM driving governor to produce PWM and drive signal, in order to control the switching action of switching transistor, make switching transistor conducting and close and utilize out-put supply with produce charging current, and via charging inductance, rechargeable battery unit is carried out to charging operations, and rechargeable battery unit is through sensing resistor and ground connection, and the cross-pressure of sensing resistor is sensing voltage; Utilize PWM driving governor to receive sensing voltage, and regulate PWM to drive the working width (duty) of signal according to sensing voltage; Utilize relatively working width and predetermined width of PWM driving governor, and judge that whether current working width is lower than predetermined width; And if working width is greater than predetermined width, continue produce PWM drive signal for inductive charging electric current to charging inductance, if and working width is equal to or less than predetermined width, stop producing PWM and drive signal, use and close switching transistor and stop providing charging current to charging inductance, and then finish the charging operations to rechargeable battery unit.
Therefore, method of the present invention can not need to use under high-sensitivity amplifier, just can utilize PWM driving governor to determine whether the working width of the pwm signal producing accurately judges the end point of charging end point lower than predetermined width, and then stop further charging, prevent from overcharging, not only can significantly reduce costs, can also improve noise resisting ability, especially can significantly improve the impact of temperature, stability and the reliability of promoting overall charging operations.
Brief description of the drawings
Fig. 1 shows the operational flowchart according to the determination methods of first embodiment of the invention charging end point.
Fig. 2 shows the system schematic according to the determination methods of first embodiment of the invention charging end point.
Fig. 3 shows the operational flowchart according to the determination methods of second embodiment of the invention charging end point.
Fig. 4 shows the system schematic according to the determination methods of second embodiment of the invention charging end point.
Wherein, description of reference numerals is as follows:
10 power input unit
20 pulse width modulations (PWM) driving governor
30 switching transistors
BT rechargeable battery unit
C filter capacitor
I charging current
IS current sensor
L charging inductance
RS sensing resistor
S10 to S60 step
Vin input power
VS sensing voltage
S10 utilizes power input unit to produce dividing voltage supply and out-put supply
S20 utilizes pulse width modulation (PWM) driving governor to produce PWM and drives signal
S30 utilizes PWM to drive signal controlling switching transistor to produce charging current
S40 utilizes charging inductance transmission charging current to rechargeable battery
S41 utilizes charging inductance and sensing resistor transmission charging current to rechargeable battery
S50 utilize PWM driving governor according to sensing voltage with regulate working width
S60 utilizes PWM driving governor to judge whether this charging operations completes and complete charge operation
Embodiment
Below coordinate accompanying drawing and Reference numeral to do more detailed description to embodiments of the present invention, make to have the knack of those skilled in the art and studying carefully after this specification and can implement according to this.
Please also refer to Fig. 1 and Fig. 2, according to operational flowchart and the system schematic of the determination methods of first embodiment of the invention charging end point.Determination methods of the present invention is mainly the charging end point that judges rechargeable battery in the constant-voltage charge after constant-current charge, uses complete charge operation.The whole charging operations of rechargeable battery comprises the constant-current charge and the constant-voltage charge that sequentially carry out, wherein in the time of constant-voltage charge, charged electrical fails to be convened for lack of a quorum and fills gradually full reduction with rechargeable battery, and determination methods of the present invention is in order to judge the charging end point of rechargeable battery when the constant-voltage charge.
Particularly, determination methods of the present invention is to utilize charging device to charge to rechargeable battery unit B T, and charging device can comprise power input unit 10, switching transistor 30, pulse width modulation (PWM) driving governor 20, charging inductance L and sensing resistor RS.
Above-mentioned rechargeable battery unit B T is limited to a rechargeable battery unit, unit, but can comprise by rechargeable battery unit, at least one unit through in parallel and/or be connected in series the rechargeable battery set that combines one.
The charging method of first embodiment of the invention judgement charging end point is from step S10, mainly to utilize power input unit 10 to receive input power Vin, such as civil power, other interchange or DC power supply, and produce dividing voltage supply and out-put supply through suitably processing, such as dividing potential drop, filtering and/or rectification processing.
Then, enter step S20, the dividing voltage supply that utilizes pulse width modulation (PWM) driving governor 20 to receive from power input unit 10, to be used as supply power supply, and produces PWM driving signal.
In step S30, utilize switching transistor 30 to receive the out-put supply from power input unit 10, and drive the switching of signal controlling switching transistor 30 to move by PWM, and then utilize out-put supply to produce charging current I.Particularly, switching transistor 30 can be power transistor, such as MOS (metal-oxide-semiconductor) transistor (MOS), wherein the gate of switching transistor 30 is connected to PWM and drives signal, therefore, PWM drives signal can control switching transistor 30 for conducting or close, that is makes the out-put supply can be via switching transistor 30 with the form transmission of charging current I.
Then in step S40, utilize charging inductance L to be electrically connected to switching transistor 30 to receive charging current I, and utilize charging current I to carry out charging operations to the rechargeable battery unit B T that is electrically connected to charging inductance L.In addition, rechargeable battery unit B T is through sensing resistor RS and ground connection, and the current sensor IS that flows through sensing resistor RS can produce sensing voltage VS on sensing resistor RS, that is one end of sensing resistor RS is ground connection, and the other end of sensing resistor RS is connected to rechargeable battery unit B T, therefore the voltage of the other end of sensing resistor RS is sensing voltage VS.
Enter step S50, utilize PWM driving governor 20 to receive sensing voltage VS, and drive the working width of signal according to sensing voltage VS with adjusting PWM, thereby charging current I is formed to feedback control loop, reach the object of constant charge electric current I.Particularly, sensing voltage VS more hour, represent that current sensor IS is too low, that is charging current I is too low, and therefore PWM driving governor 20 need to increase working width, uses and improves charging current I, and vice versa.
Finally perform step S60, utilize relatively working width and the predetermined width of PWM driving signal of PWM driving governor 20, full to judge whether rechargeable battery unit B T has filled, or noly reach the charging end point of charging operations and stop charging operations, to complete whole charging operations.Preferably, predetermined width can be set as PWM drive signal work period 5% to 0.2% between any number, such as 2% of the work period.
Particularly, if working width is greater than predetermined width, also do not reach charging end point, and the lasting PWM driving signal that produces of PWM driving governor 20, make switching transistor 30 that charging current I is provided and rechargeable battery unit B T is charged.Another situation is, if working width is equal to or less than predetermined width, reach charging end point, and PWM driving governor 20 stops producing PWM and drives signal, or drive the working width of signal to be set as zero PWM, use and close switching transistor 30 and stop providing charging current I to charging inductance L, that is finish the charging operations to rechargeable battery unit B T.
Above-mentioned PWM driving governor 20 can be realized by microprocessor (MCU), uses the flow process of carrying out specific firmware program and control whole charging operations.In addition, for further improving the electrical quality of charging current I, such as filtering noise, can be as shown in Figure 2, utilize filter capacitor C that the serial connection point of charging inductance L and rechargeable battery unit B T is connected to ground connection.
In addition, with further reference to Fig. 3 and Fig. 4, be respectively operational flowchart and the system schematic of the determination methods of second embodiment of the invention charging end point, wherein the second embodiment is similar to the first embodiment, its main difference is that the step S41 of the second embodiment utilizes the charging inductance L of serial connection and sensing resistor RS to charge to rechargeable battery unit with transmission charging current J, as shown in Figures 3 and 4, that is the first embodiment and the second embodiment be the feedback control path that uses different connected modes.Particularly, in the step S41 of the second embodiment, sensing resistor RS is connected between charging inductance L and rechargeable battery unit B T, now, the terminal voltage of sensing resistor RS is required sensing voltage VS, and in the step S40 of the first embodiment, sensing resistor RS is connected between rechargeable battery unit B T and ground connection.
Because all the other operational processes steps of the second embodiment are as the first embodiment, do not repeat them here.
Be noted that further, also can be as shown in Figure 4, utilize filter capacitor C that the serial connection point of charging inductance L and sensing resistor RS is connected to ground connection, use and improve the charging quality of charging current I to rechargeable battery unit B T.
In addition, for further improving the electrical quality of charging current I, such as filtering noise, can be as shown in Figure 2, utilize filter capacitor that the serial connection point of charging inductance L and rechargeable battery unit B T is connected to ground connection.
In sum, feature of the present invention is not use analog hardware mode but utilizes digital processing mode, to judge the full degree of filling of rechargeable battery unit, therefore, the analogue amplifier that does not need high sensitivity and be easily disturbed, and can directly utilize the PWM driving governor of numeral running to drive the work period of signal according to PWM, just can accurately judge whether rechargeable battery unit fills full, and then determine the end point of charging operations.Therefore, the present invention not only can significantly simplify circuit design and physical layout, can also reduce cost of manufacture simultaneously, especially PWM driving governor is originally as digital circuit, therefore can improve noise resisting ability, improve the accuracy of charging end point, stability and the reliability of promoting overall charging operations.
Above said content is only in order to explain preferred embodiment of the present invention; not attempt is done any pro forma restriction to the present invention according to this; therefore, all have under identical invention spirit, do relevant any modification of the present invention or change, all must be included in the category that the invention is intended to protection.
Claims (7)
1. the determination methods of the end point of charging, in order to mat one charging device, one rechargeable battery unit is carried out to a charging operations, this charging device comprises a power input unit, a switching transistor, a pulse width modulation driving governor, a charging inductance and a sensing resistor, it is characterized in that, the method is to comprise the following steps:
Utilize this power input unit to receive the input power from outside, and process and generation one dividing voltage supply and an out-put supply through dividing potential drop, filtering and/or rectification;
Utilize this pulse width modulation driving governor to receive this dividing voltage supply to be used as supply power supply, and produce a pulse width modulated driving signal;
Utilize this switching transistor to receive this out-put supply, and produce a charging current by the switching action of this this switching transistor of pulse width modulated driving signal control;
Utilize this charging inductance to be electrically connected to this switching transistor, in order to receive this charging current, and utilize this charging current and carry out this charging operations to being electrically connected to this rechargeable battery unit of this charging inductance, this rechargeable battery unit is through this sensing resistor and ground connection, and a current sensor flows through this sensing resistor, and the cross-pressure of this sensing resistor is a sensing voltage;
Utilize this pulse width modulation driving governor to receive this sensing voltage, and according to this sensing voltage to regulate a working width of this pulse width modulated driving signal;
This pulse width modulation driving governor is working width and a predetermined width of this pulse width modulated driving signal relatively, completes to judge this charging operations whether to reach a charging end point; And
If this working width is greater than this predetermined width, this charging end point does not also reach and lasting this pulse width modulated driving signal that produces of this pulse width modulation driving governor, if and this working width is equal to or less than this predetermined width, the working width that this charging end point has reached and this pulse width modulation driving governor is set this pulse width modulated driving signal is zero, use and close this switching transistor and stop providing this charging current to this charging inductance, thereby finish the charging operations to this rechargeable battery unit.
2. the determination methods of the end point of charging, in order to mat one charging device, one rechargeable battery unit is carried out to a charging operations, this charging device comprises a power input unit, a switching transistor, a pulse width modulation driving governor, a charging inductance and a sensing resistor, it is characterized in that, the method comprises the following steps:
Utilize this power input unit to receive the input power from outside, and process and generation one dividing voltage supply and an out-put supply through dividing potential drop, filtering and/or rectification;
Utilize this pulse width modulation driving governor to receive this dividing voltage supply to be used as supply power supply, and produce a pulse width modulated driving signal;
Utilize this switching transistor to receive this out-put supply, and produce a charging current by the switching action of this this switching transistor of pulse width modulated driving signal control;
Utilize this charging inductance and this sensing resistor of serial connection, this charging current is transferred to this rechargeable battery unit, carry out this charging operations in order to this rechargeable battery unit, and this sensing resistor is to be connected between this charging inductance and this rechargeable battery unit, and the terminal voltage of this sensing resistor is a sensing voltage, the one end not being connected with this sensing resistor in this rechargeable battery unit is ground connection;
Utilize this pulse width modulation driving governor to receive this sensing voltage, and according to this sensing voltage to regulate a working width of this pulse width modulated driving signal;
This pulse width modulation driving governor is working width and a predetermined width of this pulse width modulated driving signal relatively, completes to judge this charging operations whether to reach a charging end point; And
If this working width is greater than this predetermined width, this charging end point does not also reach and lasting this pulse width modulated driving signal that produces of this pulse width modulation driving governor, if and this working width is equal to or less than this predetermined width, the working width that this charging end point has reached and this pulse width modulation driving governor is set this pulse width modulated driving signal is zero, use and close this switching transistor and stop providing this charging current to this charging inductance, thereby finish the charging operations to this rechargeable battery unit.
3. determination methods as claimed in claim 1 or 2, is characterized in that, the work period that this predetermined width is this pulse width modulated driving signal 5% to 0.2% between any number.
4. determination methods as claimed in claim 1 or 2, is characterized in that, this pulse width modulation driving governor is a microprocessor, uses and carries out a firmware program and control this charging operations.
5. determination methods as claimed in claim 1 or 2, is characterized in that, this rechargeable battery unit comprises by least one unit rechargeable battery cell formation and through in parallel and/or be connected in series a rechargeable battery set that combines one.
6. determination methods as claimed in claim 1, is characterized in that, further comprises:
Utilize a filter capacitor that the serial connection point of this charging inductance and this rechargeable battery unit is connected to ground connection.
7. determination methods as claimed in claim 2, is characterized in that, further comprises:
Utilize a filter capacitor that the serial connection point of this charging inductance and this sensing resistor is connected to ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310176161.1A CN104158233B (en) | 2013-05-14 | 2013-05-14 | The determination methods of charging end point |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310176161.1A CN104158233B (en) | 2013-05-14 | 2013-05-14 | The determination methods of charging end point |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104158233A true CN104158233A (en) | 2014-11-19 |
| CN104158233B CN104158233B (en) | 2016-08-03 |
Family
ID=51883676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310176161.1A Expired - Fee Related CN104158233B (en) | 2013-05-14 | 2013-05-14 | The determination methods of charging end point |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104158233B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972566A (en) * | 2017-04-11 | 2017-07-21 | 深圳市华星光电技术有限公司 | Battery charger and method for charging batteries |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5204611A (en) * | 1991-03-13 | 1993-04-20 | Norvik Technologies Inc. | Charging circuits for rechargeable batteries and cells |
| US5376875A (en) * | 1993-12-03 | 1994-12-27 | Motorola, Inc. | Battery charger status monitor circuit and method therefor |
| CN101777674A (en) * | 2010-03-04 | 2010-07-14 | 飞毛腿(福建)电子有限公司 | High-capacity lithium-ion battery backup state managing method |
| TW201138259A (en) * | 2010-04-21 | 2011-11-01 | Dynapack Internat Technology Corp | Charging method for rechargeable battery and its charging battery |
-
2013
- 2013-05-14 CN CN201310176161.1A patent/CN104158233B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5204611A (en) * | 1991-03-13 | 1993-04-20 | Norvik Technologies Inc. | Charging circuits for rechargeable batteries and cells |
| US5376875A (en) * | 1993-12-03 | 1994-12-27 | Motorola, Inc. | Battery charger status monitor circuit and method therefor |
| CN101777674A (en) * | 2010-03-04 | 2010-07-14 | 飞毛腿(福建)电子有限公司 | High-capacity lithium-ion battery backup state managing method |
| TW201138259A (en) * | 2010-04-21 | 2011-11-01 | Dynapack Internat Technology Corp | Charging method for rechargeable battery and its charging battery |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106972566A (en) * | 2017-04-11 | 2017-07-21 | 深圳市华星光电技术有限公司 | Battery charger and method for charging batteries |
| CN106972566B (en) * | 2017-04-11 | 2019-05-31 | 深圳市华星光电技术有限公司 | Battery charger and method for charging batteries |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104158233B (en) | 2016-08-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9465081B2 (en) | Battery power detecting device and method | |
| US20140062417A1 (en) | Intelligent charge-discharge controller for battery and electronic device having same | |
| CN102005795B (en) | Electric quantity detecting device for rechargeable battery | |
| JP2017506873A (en) | Monitoring or controlling charging current in a resonantly regulated inductive charger | |
| EP1263111A3 (en) | Method, program and apparatus for detecting internal information of a rechargeable battery and apparatus including said detecting apparatus | |
| JP2002050410A (en) | Inner state detecting method for secondary cell, detecting device, apparatus equipped with detecting device, inner state detecting program, medium equipped with inner state detecting program | |
| CN105006871B (en) | A kind of method and device for being used to simulate actual battery charging process | |
| CN108802616A (en) | Electrical equipment and its battery capacity management method and system | |
| CN105911458A (en) | Battery analog circuit | |
| CN103760495A (en) | Method for generating SOC source in BMS detection and method for testing SOC estimated accuracy | |
| JP2019504451A (en) | Effective battery cell balancing method and system using duty control | |
| CN105990879A (en) | Device for battery charging and electronic device | |
| CN102944845B (en) | The method and system of battery electric quantity is detected in the constant-voltage charge process of mobile terminal | |
| He et al. | iCharge: User-interactive charging of mobile devices | |
| CN104122884A (en) | Simulation test device of battery management system | |
| CN105425159A (en) | Device and method for detecting remaining power of battery | |
| CN208367184U (en) | A kind of charging and discharging lithium battery test device | |
| CN202906503U (en) | Control device for mobile power supply and mobile charging power supply | |
| CN104779670A (en) | Method for detecting whether storage battery is fully charged or not | |
| CN104267350A (en) | Automatic storage battery charging-discharging and capacity detection device | |
| CN106291386A (en) | A kind of method of quick detection rechargeable battery capacity and detection device thereof | |
| CN106058971A (en) | Charging protection method and mobile terminal | |
| CN103529390A (en) | Battery residual electric amount measuring device based on single-chip microcomputer | |
| CN205139344U (en) | Power display device and electronic equipment | |
| CN203352252U (en) | Intelligent mobile power supply device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160803 Termination date: 20210514 |