USRE42079E1 - Method and apparatus allowing a battery to regain charge in a handheld device without an applied external charge while still supplying power selected designated components - Google Patents
Method and apparatus allowing a battery to regain charge in a handheld device without an applied external charge while still supplying power selected designated components Download PDFInfo
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- USRE42079E1 USRE42079E1 US11/347,784 US34778406A USRE42079E US RE42079 E1 USRE42079 E1 US RE42079E1 US 34778406 A US34778406 A US 34778406A US RE42079 E USRE42079 E US RE42079E
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- source voltage
- handheld computer
- battery module
- internal components
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/263—Arrangements for using multiple switchable power supplies, e.g. battery and AC
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/32—Means for saving power
- G06F1/3203—Power management, i.e. event-based initiation of a power-saving mode
- G06F1/3234—Power saving characterised by the action undertaken
- G06F1/3287—Power saving characterised by the action undertaken by switching off individual functional units in the computer system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Definitions
- This invention relates to the field of handheld computers.
- the invention relates to battery management of handheld computers.
- Handheld computers are portable battery-operated units. Typically, handheld computers are used in the field, or carried on a person. The handheld computers may be docked with personal computers to exchange or synchronize information. Functions provided by handheld computers include management of databases, such as for example, calendars and phone numbers.
- Battery management is an important consideration for handheld computers. Improved battery management preserves costs associated with replacing batteries for the handheld computer.
- handheld computers employ rechargeable batteries.
- handheld computers are docked in docking stations or coupled to electrical outlets.
- the portability of these handheld computers is limited by the need to recharge or replace the batteries of the handheld computer.
- a handheld computer is provided a regulator to manage a battery module.
- the regulator receives a battery voltage, and outputs a regulated voltage for logical components of the handheld computer.
- the regulator reduces or bucks the battery voltage to output a regulated voltage profile for components of the handheld computer.
- the regulator implements a full duty-cycle to output an unregulated voltage that matches the battery voltage being supplied to the regulator.
- FIG. 1 illustrates a handheld computer, under an embodiment of the invention.
- FIG. 2 is a flow process for managing power in a handheld computer, under an embodiment of the eon.
- FIG. 3 is a flow process for managing power in a handheld computer, under an embodiment of the intention.
- FIG. 4 is a block diagram of internal components of a handheld computer, under an embodiment of the invention.
- FIG. 5 is a block diagram of a handheld computer with a power management module under an embodiment of the invention.
- FIG. 6 is a voltage profile diagram for an output of the regulator such as shown by FIG. 3 , compared output of a battery module for the handheld computer.
- FIG. 7 illustrates another regulator including a switching element to affect regulating characteristics, under an embodiment of the invention.
- FIG. 8 is a voltage profile diagram of an output of the regulator such as shown by FIGS. 3 and 7 , compared with an output of a battery module of the handheld computer, under an embodiment of the invention.
- An embodiment of the invention provides a regulator for a handheld computer.
- the regulator receives a voltage supplied from a battery module, and outputs a logic level voltage to components of the handheld computer.
- the regulator regulates the battery voltage to extend the life of the battery module.
- the regulator implements a bypass when the battery voltage drops below a designated level.
- the output of the regulator matches the battery voltage received by the regulator.
- handheld computer can perform some functions when the bypass mode is implemented, such as maintain a sleep mode, preserve memory, or sound an alarm.
- handheld computer 100 includes a monitoring module to remove most of the load from the battery, when the voltage level of the battery module drops below a certain level. When the load is removed, the battery module regains some voltage. The extended life of the battery module is then used to preserve memory.
- embodiments of the invention provide for a handheld computer having an extended battery life. Further, regulating components such as voltage boosters are eliminated, thereby simplifying regulator circuitry and extending battery life of the handheld computer.
- FIG. 1 illustrates a handheld computer 100 for use with an embodiment of the invention.
- An exemplary handheld computer includes, for example, Palm Pilot®, Palm III®, Palm V® or Palm VII® organizer manufactured by Palm, Inc.
- Other exemplary handheld computers include devices operating on a Windows CE® operating systems.
- handheld computer 100 includes a housing 110 .
- a display 120 is accessible from a front of the housing 110 .
- the display includes a Graffiti® writing section 118 to allow users to select menus and enter information.
- a plurality of application buttons 130 are available from the front of the housing 110 .
- a rocking switch actuator 135 is positioned on a surface of housing 110 to manipulate or change the configurations of display 120 .
- a speaker (not shown) may be provided on a surface of the housing 110 .
- the handheld computer 100 may include an infra-red port 140 to transfer and receive information across one type of wireless medium.
- the handhled computer 100 may also include a port to enable communications with another device, such as for example a communication cradle (not shown).
- the communication cradle may be employed to synchronize or transfer information to another computer, such as a desktop computer.
- the handheld computer 100 may operate in different power states. As described herein, handheld computer 100 may be awake, in which case input and output components of handheld computer are operable. The handheld computer 100 may be asleep, in which case the handheld computer is operable, but not active. When sleeping, handheld computer may be switched to an awake state through user-input. The handheld computer 100 may also implement a lock-out, in which case the handheld computer may be asleep or operating in a reduced power state, while locking the user out from powering the computer to an awake state. In one embodiment, battery power is used primarily to preserve memory when handheld computer 100 is in the lock-out state. The handheld computer 100 may also be in a reset state. In the reset state, the handheld computer 100 is detached from a battery source, until sufficient power is detected from the battery to erase the memory.
- FIG. 2 illustrates a process for operating a power management system, under an embodiment of the invention.
- the process may be implemented on handheld computer 100 through use of hardware components.
- other embodiments may implement the flow process through firmware, software, or a combination of hardware and programming.
- the battery module may include one or more individual batteries.
- the battery modules are lithium-ion type batteries.
- the battery module supplies a source voltage to power internal components of the handheld computer that operate at logic levels, including a processor 410 ( FIG. 4 ) and a memory 420 , 430 (FIG. 4 ).
- the battery module may also provide one or more voltages that are modified for other components not operating under logic levels.
- the battery module may provide voltages that are raised or stepped to power displays, digitizers and/or analogdigital converters.
- the source voltage from a rechargeably battery module 415 is detected as to whether the source voltage is greater than a first threshold level.
- the first threshold level is an operational level designated for handheld computer 100 .
- the operational level includes a voltage level range that is suitable for executing logical operations by internal components of handheld computer, including processor 410 and memory 420 , 430 .
- the designated operational voltage level may range between 3.0 and 3.4 volts, and preferably is about 3.2 volts.
- the source voltage is greater than the designated operational level.
- the maximum source voltage can be between 4.2-4.4 volts. Without the battery module being recharged, the source voltage drops to the first threshold, where it is detected.
- the source voltage is reduced in step 220 to the operational level designated for handheld computer 100 .
- the source voltage may be reduced by regulator 550 , shown in FIG. 5 .
- step 230 the regulator is bypassed, and the source voltage is directly supplied to at least some of the internal components of the handheld computer.
- the handheld computer 100 does not buck or boost the source voltage in supplying the source voltage to the handheld computer 100 . This is in contrast to other devices, which may boost the source voltage to the operational level.
- the regulator is bypassed only when the source voltage level is at a level that cannot feasibly sustain normal operations of the handheld computer 100 .
- handheld computer 100 initiates a lockout of the software to preserve memory data.
- the processor performs minimal functions, while memory is being sustained. User-interaction is prevented during the lock-out.
- Other internal components of handheld computer 100 may be signaled to stop drawing power from the battery module.
- the designated operational level is 3.6 volts.
- the regulator reduces the source voltage to 3.6 volts. Once the source voltage decreases below 3.6 volts, the source voltage passes through the regulator with no voltage modification.
- step 240 the source voltage is detected as to whether the source voltage is at an amnesia level. At the amnesia level, the source voltage is not sufficient to perform basic operations, such as sustaining memory. Prior to reaching this level, most components of handheld computer 100 should have been switched off to stop drawing power from the battery module.
- handheld computer 100 is in a reset state.
- the battery module is detected from the processor and memory. Once the battery module is recharged, all memory in handheld computer is erased. This avoids hardware damage to components of handheld computer 100 , including the memory 420 , 430 .
- the source voltage may initially be detected for a level that is different than the designated operational level of the handheld computer 100 , while the regulator 550 ( FIG. 5 ) may be configured to output the source voltage at the designated operational level of the handheld computer.
- the source voltage may be detected for a level of 3.8 volts. If the source voltage is greater than 3.8 volts, then the regulator reduces the source voltage to 3.6 volts. Once the source voltage falls below the first detected level, then the source voltage is unregulated.
- additional components of the handheld computer 100 other than processor 410 and memory 420 , 430 may be operable.
- a user may still input data through application buttons, or use a serial port to synchronize information from handheld computer 100 to a desktop.
- FIG. 3 illustrates another power management process for handheld computer 100 , under another embodiment of the invention.
- handheld computer 100 employs a “keep alive” voltage to preserve memory.
- Certain types of battery modules have an inherent characteristic of regaining some voltage once a load is removed from the battery.
- lithium type batteries exhibit an inherent property of regaining voltage levels after the load is removed or reduced.
- handheld computer 100 includes a battery module 415 (see FIG. 4 ) having this inherent feature to prolong the duration in which memory can be preserved, without recharging the batteries.
- step 310 the source voltage is detected as to whether the source voltage is at the designated operational level. If the source voltage is detected to be at or below the operational level, then a lockout is initiated in step 320 .
- internal components of handheld computer 100 including input and output mechanisms, are switched to stop drawing power from the battery module.
- the handheld computer 100 also locks out the user from being able to awaken the processor or operate it in anyway.
- the processor and memory are the only components receiving power from battery module. In this way, most of the load on the battery module is removed, so that the battery module to regain some of its voltage without receiving an external charge.
- the increase charge to the battery module 415 once the load is removed is referred as the “keep-alive” voltage.
- the keep-alive voltage is used to sustain memory voltage within handheld computer 100 .
- the lockout remains in force while the battery module 415 is allowed to increase.
- the source voltage is detected to determine if the level of the source voltage is greater than a recharge level.
- the recharge level indicates that the battery module 415 is recharged.
- recharge level is sufficiently greater than the operational level of handheld computer 100 to indicate that the increased charge level is not a result of inherent chemical characteristics of the battery module 415 , but rather the actual presence of an external change.
- the recharge level is 3.7 volts.
- step 335 the processor is signaled to end the lockout. The flow process then returns to step 310 .
- the source voltage is detected again to determine whether the source voltage is at the amnesia level.
- the amnesia level corresponds to a minimum voltage designated as being the cut-off for avoiding damage to handheld computer 100 .
- the amnesia level is about 2.8 volts.
- the handheld computer 100 resets in step 345 . This includes erasing the memory to avoid damage.
- the source voltage is detected to be at a warning level.
- the warning level may be 3.76 volts.
- One or more detectors may be used to detect the source voltage from the battery module and to signal the processor when the source voltage is detected to be below the warning level. If the source voltage is detected to be at the first warning level, then the warning condition is signaled to a user of handheld computer 100 .
- the warning condition is an audible or visual alert.
- the handheld computer 100 may be operable after the first warning condition is satisfied.
- the processor may be awakened by user-input to execute one or more applications.
- data may be entered into handheld computer 100 , display 120 may be powered to display data, etc.
- a second warning condition may be detected.
- the second warning condition is detected by processor 410 ( FIG. 4 ) if the battery module 415 ( FIG. 4 ) is not recharged during a designated time period after the source voltage was detected to be at the first warning level.
- the second warning condition may be detected if handheld computer 100 remains in a sleep state for three days without being charged.
- the second warning condition may also be detected if handheld computer 100 is operated in an awake state for 60 minutes after the first warning condition is satisfied.
- FIG. 4 illustrates a block diagram of handheld computer 100 , using a rechargeable battery module 415 under an embodiment of the invention.
- a power monitoring module 435 is coupled to the battery module 415 .
- the power monitoring module 435 regulates the source voltage for the internal components of the handheld computer 100 .
- handheld computer 100 includes internal components such as processor 410 , volatile memory 420 , and non-volatile memory 430 .
- the processor 410 is coupled to application buttons 462 , a speaker 464 , an IR port 466 , and an output port 468 .
- Other components that can be signaled by processor include universal asynchronous (UART) (not shown).
- the power monitoring module 435 signals processor 410 information about the voltage level of the battery module 415 to enable the processor 410 to manage the load on the power supply.
- the first and second memory components 420 , 430 may comprise a Flash memory and a dynamic random access memory (DRAM).
- An RS 432 level shifter 458 couples processor 410 to output port 468 .
- output port 468 is used to establish communications with another computer such as a personal computer.
- processor 410 is a Dragonball 68328EZ®, manufactured by the Motorola Corp.
- a power rail 432 carries the source voltage to components of handheld computer 100 that operate at logic levels.
- the power monitoring module 435 receives the source voltage from the battery module 415 .
- the power monitoring module 435 controls the source voltage being supplied to power rail 432 .
- power monitoring module 435 reduces the source voltage when the source voltage is above the operational level of handheld computer 100 .
- the source voltage is fed directly to power rail 432 when the level of the source voltage falls below a specified level, preferably below the operational level of handheld computer 100 .
- power monitoring module 435 is configured to allow a keep-alive voltage of the rechargeable battery module to maintain memory operations in handheld computer 100 .
- the power monitoring module 435 includes components to signal the processor 410 detection levels of the source voltage. The processor 410 then implement the power management controls.
- an embodiment includes a voltage modifier 456 may receive a battery input via a display power line 422 .
- the voltage modifier 456 converts the direct current (DC) on display power line 422 to an alternating voltage with a high-gain amplitude.
- the power management system 500 includes rechargeable battery module 415 , processor 410 , and power monitoring unit 435 .
- the power monitoring unit 435 includes first detector 510 , second detector 520 , third detector 530 , and regulator 550 .
- regulator 550 include a buck component 555 .
- the buck component 555 refers to a characteristic or feature of regulator 550 that causes source voltage passing through the regulator to be reduced.
- the regulator 555 may also include a bypass switch 560 .
- the bypass switch 560 is preferably an inherent characteristic of the buck component 555 or regulator 550 .
- the bypass switch causes the source voltage to bypass the buck component at specific voltage levels.
- switch 560 may be an inherent characteristic of the buck component 555 , caused by inductive properties incorporated into the buck component 455 .
- the inherent characteristics of regulator 550 determine a voltage at which the regulator stops regulating, and bypasses the source voltage from the battery module 415 to power rail 432 .
- the regulator bypasses the source voltage when the source voltage is at the operational level of handheld computer 100 .
- switch 555 can be a transistor tied to a switching voltage, and the switching voltage may correspond to the operational voltage of handheld computer 100 or another voltage.
- FIGS. 7 and 8 An example of this embodiment is shown with FIGS. 7 and 8 .
- first detector 510 detects when the source voltage is at the operational level.
- the minimum operational level is designated at approximately 3.2 volts.
- the first detector 510 signals processor 410 when the source voltage reaches this level. In response, processor 410 initiates a protective measure.
- the processor 410 initiates the lock-out state as the protective step. During the lock-out state, the processor 410 locks out the software, and signals other components to stop drawing power from rail 432 . The remaining power from battery module 415 is used to sustain memory. Other minimal functions may be performed, but once the lock-out state is initiated by processor 410 , the load on battery module 415 is significantly reduced, while memory is maintained.
- a second detector 520 is coupled to the first detector 510 and the battery module 415 to detect a recharge event.
- a recharge event is detected by processor 410 only if the first detector 510 has already signaled the processor 410 that the source voltage is below the operational level. If recharge is detected by processor 410 from second detector 520 , both the first and second detectors are reset.
- the regulator 550 receives the source voltage from battery module 415 .
- the regulator reduces the source voltage if the source voltage is greater than the operational level of handheld computer 100 . If the source voltage falls below the operational level, the regulator 550 passes the source voltage through without modification.
- buck component 555 of regulator 550 is bypassed once the source voltage falls below the operational level. The bypass maybe implemented by switch 560 . Inherent features of the regulator 550 detect the level of the source voltage. Therefore, regulator 550 operates independently of the detectors 510 - 530 .
- processor 410 initiates the lock-out to preserve memory data. This reduces the load on the battery module 415 , allowing the battery module to increase in voltage.
- the level of the source voltage may increase above the operational level again, once the first detector 510 is triggered.
- second detector 520 since second detector 520 must be triggered before first detector 510 is reset, the lock-out is not terminated.
- the second detector 520 is set to detect a voltage level that is sufficiently large to clearly indicate a recharge event, rather than an inherent increase due to the chemistry of the rechargeable battery.
- the third detector 530 detects when the source voltage reaches a minimum level for sustaining memory operations. If the third detector is triggered by the source voltage reaching the amnesia level, power on the rail 432 is discontinued. Upon a subsequest power-up, if the source voltage is detected to be greater than the amnesia level, reset mechanism 570 signals processor 410 to reset the handheld computer.
- FIG. 6 is a voltage profile illustration of a profile for the source voltage from battery module 415 (source voltage profile) compared with an output of regulator 550 to rail 432 (rail voltage profile), under an embodiment of the invention.
- the comparison illustrated by FIG. 6 assumes that battery module 415 is used continuously from a maximum charge without being recharged.
- the source voltage profile is designated by numeral 610 .
- the rail voltage profile is shown by numeral 620 . Voltage values provided in FIG. 6 or elsewhere in the text are provided as examples.
- source voltage profile 610 corresponds to an output of the battery module 415 comprising a Lithium-ion type battery pack.
- the battery module 415 When the battery module 415 is operated from a fully charged state with no additional power input, the amplitude of the source voltage profile 610 is assumed to decrease continuously while handheld computer 100 is used frequently.
- the features and characteristics of the source voltage profile 610 depend on the nature of use of handheld computer 100 , as well as the power consumption characteristics of handheld computer 100 .
- the source voltage profile 610 is described with respect to multiple time intervals. In Interval I, the amplitude of source voltage profile 610 decreases non-linearly from a maximum voltage level. In one embodiment, the maximum voltage level may be approximately 4.2 volts.
- the source voltage profile 610 decreases gradually from an initial steady-state voltage level.
- the initial steady-state range may correspond to 3.6 volts.
- Interval II ends when the source voltage profile 610 has an amplitude equal to the operational level of handheld computer 100 .
- the regulator 550 reduces the source voltage to a constant level corresponding to the operational level designated for handheld computer 100 .
- the rail voltage profile 620 is constant during Interval I and II.
- the source voltage provided on rail 432 is sufficient to enable a user to have complete use of handheld computer 100 .
- warning levels may be detected by software-implemented power management systems.
- Interval III the load applied to source voltage profile 610 is removed.
- the load may be removed when processor 410 implements the software lockout of handheld computer 100 .
- the reduction of the load on the battery module 415 causes an increase in source voltage profile 610 , due to internal resistence of the rechargeable battery module 415 .
- the rise in voltage in Interval III is the “keep-alive” voltage.
- the “keep-alive” voltage is used primarily to preserve the data in the memory when the load on the battery module 415 is reduced.
- the regulator 550 preferably reduces the source voltage when the source voltage is detected to be above the minimum operational level of handheld computer 100 . This prolongs the duration of the “keep-alive” voltage (Interval III).
- the rail voltage profile 620 is therefore constant, at the designated operational level of handheld computer 100 .
- source voltage profile 610 decreases below the operational level of handheld computer 100 . Once the level of the source voltage drops below the operational level, the regulator 550 feeds the source voltage to power rail 432 without modification. When the regulator 550 is bypassed, the source voltage and rail voltage profiles 610 and 620 exhibit the same or similar behavior. In other words, the rail voltage profile 620 decreases with the source voltage profile 610 .
- regulator 550 includes buck component 555 , which is bypassed during Interval IV. Before regulator 550 is bypassed, the rail voltage profile 620 represents a fractional duty cycle of source voltage profile 610 . After the buck component 555 is bypassed, the rail voltage profile 620 represents a full duty cycle of source voltage profile 610 .
- the source voltage profile 610 and rail voltage profile 620 may decrease sharply from the peak of the “keep-alive” voltage.
- the voltage carried on rail 432 is used to preserve the memory data. Unless a recharge is detected, the level of the source voltage decreases until the amnesia level (2.8 volts) is detected, and then handheld computer 100 is reset.
- the “keep-alive” voltage extends the duration in which memory can be preserved without recharging the handheld computer 100 .
- use of regulator 550 to reduce the source voltage to the operational level extends the life of battery module 415 with one charge.
- FIG. 7 illustrates a regulator 750 for use with handheld computer 100 , under another embodiment of the invention. As with embodiments described by FIG. 3 , regulator 750 may be coupled within handheld computer 100 to regulate the source voltage profile from battery module 415 .
- the regulator 750 may include a regulator switch 760 to switch the regulator into the bypass.
- the regulator switch 760 may be set to switch the source voltage so as to bypass the buck component 755 regulator 750 .
- the regulator 750 may implement the bypass at a voltage determined by the regulator switch 760 .
- the regulator switch 760 may be tied to a specific voltage to determine the switching level.
- FIG. 8 is a voltage profile illustration of the source voltage profile 610 compared with the rail voltage profile 820 for regulator 750 .
- regulator 750 is set so that buck component 755 is bypassed at a voltage determined by the switching voltage of a regulator switch 760 .
- the rail voltage profile 820 matches the source voltage profile once the source voltage is detected to beat the switching voltage.
- rail voltage profile 820 enables handheld computer 100 to include more functionality.
- the lock-out feature may still be implemented to create a keep-alive voltage. If the rail voltage profile 820 matches the source voltage profile 610 , then the increased voltage could be used to increase functionality to handheld computer 100 during the “keep-alive”, albeit for a shorter time period.
- the regulator switch 460 may be set approximately to, for example, 3.6 volts. Once the voltage supplied from battery module 415 decreases to the switching voltage, regulator switch 760 causes buck component 755 to be bypassed. As a result, power rail 432 is supplied voltage from battery module 415 at a full duty-cycle. The switching voltage and regulator switch 760 may be manipulated to allow buck component 755 to be bypassed at a different switching voltage. This allows power rail 432 to operate off a full duty-cycle sooner or later in relation to the source voltage profile 610 .
- An example of a regulator for use with an embodiment such as described with FIGS. 5-7 is a 1474 Linear Tech power supply controller, manufactured by Linear Tech Inc.
- the 1474 Linear Tech controller includes an inductive component to cause the source voltage to bypass modification. Further, 1474 Linear Tech controller produces an output such as described with FIG. 6 .
- An additional switch may be employed with the 1474 Linear Tech component to create a regulator profile such as described with FIG. 8 .
- a low drop-out (LDO) regulator may be employed with an embodiment of the invention.
- An example of a LDO regulator includes 801 Seiko LDO, manufactured by Seiko Inc. While the LDO regulator may lack an inductive component such as described with FIGS. 3 and 5 , the LDO regulator may provide bucking characteristics similar to embodiments described with FIGS. 5-7 .
- a switch may be used to implement the bypass of the source voltage to the power rail 432 .
Abstract
Description
Claims (39)
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US11/347,784 USRE42079E1 (en) | 2000-05-31 | 2006-02-03 | Method and apparatus allowing a battery to regain charge in a handheld device without an applied external charge while still supplying power selected designated components |
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US09/588,108 US6687839B1 (en) | 2000-05-31 | 2000-05-31 | Method and apparatus allowing a battery to regain charge in a handheld device without an applied external charge while still supplying power selected designated components |
US11/347,784 USRE42079E1 (en) | 2000-05-31 | 2006-02-03 | Method and apparatus allowing a battery to regain charge in a handheld device without an applied external charge while still supplying power selected designated components |
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US11/347,784 Expired - Lifetime USRE42079E1 (en) | 2000-05-31 | 2006-02-03 | Method and apparatus allowing a battery to regain charge in a handheld device without an applied external charge while still supplying power selected designated components |
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US6603469B1 (en) | 2000-08-28 | 2003-08-05 | Palm, Inc. | Method and apparatus for user selectable display mode for intelligently enhancing battery life |
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US20120131362A1 (en) * | 2010-11-22 | 2012-05-24 | Foundation Of Soongsil University-Industry Cooperation | Battery power control device, portable device and method for controlling portable device |
US8527791B2 (en) * | 2010-11-22 | 2013-09-03 | Foundation Of Soongsil University-Industry Cooperation | Portable device capable of extending available battery time and method for controlling portable device |
US9678554B2 (en) * | 2013-02-05 | 2017-06-13 | Nuvoton Technology Corporation | Low power mode operation when charging a device |
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