CN103107577A - Battery management circuit and terminal - Google Patents
Battery management circuit and terminal Download PDFInfo
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- CN103107577A CN103107577A CN2013100473994A CN201310047399A CN103107577A CN 103107577 A CN103107577 A CN 103107577A CN 2013100473994 A CN2013100473994 A CN 2013100473994A CN 201310047399 A CN201310047399 A CN 201310047399A CN 103107577 A CN103107577 A CN 103107577A
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Abstract
The invention belongs to the technical field of electronics, and discloses a battery management circuit and a terminal. The battery management circuit comprises a management switch and a starting circuit, wherein the management switch is used for connecting a battery with a power supply management chip, and the starting circuit is connected with a positive electrode of the battery and a control end of the management switch. The starting circuit is used for utilizing voltage provided by the positive electrode of the battery to switch the management switch to a conducting state from a non-conducting state after receiving a power-on signal. According to the battery management circuit and the terminal, the starting circuit is arranged additionally for utilizing the voltage provided by the battery in the terminal to switch the management switch to the conducting state from the non-conducting state, and therefore the problem that a charger is needed for turning on a switching tube again after the switching tube is shut off in a power-off state is solved, and the effect that on the premise that very little electric power is consumed or no electric power is consumed, the switching tube can be turned on again without the aid of the charger after being shut off in the power-off state is achieved.
Description
Technical field
The present invention relates to electronic technology field, particularly a kind of battery management circuit and terminal.
Background technology
Mobile terminal such as smart mobile phone, panel computer and E-book reader is the most widely used electronic product in people's daily life.Mobile terminal is all powered by built-in battery usually.
Please refer to Fig. 1, it shows the connection diagram between each assembly relevant to power supply in mobile terminal.This mobile terminal comprises USB(Universal Serial BUS, USB) interface 102, charging input end 104, battery 106, power management chip 108, switch control module 110 and system 112.Wherein, the positive pole of battery 106 is connected with power management chip 108 by management switch P1, and the control end of management switch P1 is connected with switch control module 110.When mobile terminal is in when shutdown, management switch P1 normally is in conducting state.Although this moment, system was not activated, power management chip 108 and some other circuit remain power consumption.Through measuring as can be known, this shutdown electric current is probably in the 0.2mA left and right, and the electric current during with respect to normal the use is very little, almost can ignore.But in some occasion, this shutdown electric current will exert an influence, and for example: this mobile terminal is the mobile phone that can not plug battery, also namely when storing battery be non-removable, can only be contained in and make battery continue power consumption in mobile phone.The capacity of supposing battery 106 is 1600mA, calculates according to 70% of this electric weight when dispatching from the factory, and the battery electric quantity in battery 106 can be kept 1600*0.7/ (0.2*24)=233 day.That is to say, if mobile phone used over 233 days after dispatching from the factory, will cause mobile phone to start shooting.And mobile phone is with this low discharging current of 0.2MA size, probably battery 106 is become be difficult to recover can't use state.In addition, some power management chip 108 exists certain defect, running status is uncertain in the situation that do not start shooting, may cause some DC-DC(DC-to-DC) the circuit on-line operation, the shutdown electric current will arrive the mA rank like this, calculate with 5mA, the battery electric quantity in this battery 106 can be kept 1600*0.7/ (5*24)=9 day., during some mobile phone shutdown, can management switch P1 acquiescence be turn-offed by switch control module 110 for this reason, make battery 106 and power management chip 108 disconnect, thereby make the battery 106 can power consumption.
In realizing process of the present invention, the inventor finds that there is following problem at least in background technology: if when shutting down, management switch P1 acquiescence is turn-offed, due to power management chip 108 not power supply when shutting down, must insert charger when making start, utilize the power supply that charger provides to come control switch control module 110 that management switch P1 is opened, then give power management chip 108 power supplies by battery 106.Obviously, under this kind scheme, can't not start shooting if the user carries charger, have larger defective.
Summary of the invention
The problem that reopens in order to solve the switching tube that needs charger could be had no progeny in off-mode ShiShimonoseki, the embodiment of the present invention provides a kind of battery management circuit and terminal.Described technical scheme is as follows:
According to a first aspect of the invention, provide a kind of battery management circuit, described circuit comprises: be used for to connect the management switch of battery and power management chip, the start-up circuit that is connected respectively with control end with the positive pole of described battery, described management switch;
Described start-up circuit is used for utilizing the voltage that described battery provides that described management switch is switched to conducting state by cut-off state after receiving starting-up signal.
Preferably, described management switch is the PMOS switching tube, and described start-up circuit comprises: the first resistance, the second resistance and the first switch;
One end of described the first resistance is connected with the positive pole of described battery by described the first switch, and the other end of described the first resistance is connected with the control end of described management switch;
One end of described the second resistance is connected with the control end of described management switch, the other end ground connection of described the second resistance;
Described the first switch is used for switching to cut-off state by conducting state after receiving starting-up signal;
The ratio of the resistance R2 of the resistance R1 of described the first resistance and described the second resistance satisfies:
R1/R2＜V
G/ (V
BAT-V
G), wherein, V
GBe the conducting voltage threshold value of described management switch, V
BATCathode voltage for described battery.
Preferably, described the first switch is the electronic switch that control end is in cut-off state when receiving high level, and described battery management circuit also comprises: the first switch enable circuit;
Described the first switch enable circuit comprises: mains switch, the 3rd resistance, T trigger and inverter;
One end ground connection of described mains switch, the other end of described mains switch is connected with the positive pole of described battery by described the 3rd resistance;
The CLK end of described T trigger is connected with the other end of described mains switch, and the Q end of described T trigger is connected with the control end of described the first switch;
The input of described inverter is connected with the Q end of described T trigger, and the output of described inverter is connected with the T end of described T trigger.
Preferably, described management switch is the PMOS switching tube, and described start-up circuit comprises: the first resistance, the first switch and second switch;
One end of described the first resistance is connected with the positive pole of described battery by described the first switch, and the other end of described the first resistance is connected with the control end of described management switch;
One end of described second switch is connected with the control end of described management switch, the other end ground connection of described second switch;
Described the first switch is used for switching to cut-off state by conducting state after receiving starting-up signal;
Described second switch is used for switching to conducting state by cut-off state after receiving starting-up signal.
Preferably, described the first switch is the electronic switch that control end is in cut-off state when receiving high level, and described battery management circuit also comprises: the first switch enable circuit;
Described the first switch enable circuit comprises: mains switch, the 3rd resistance, T trigger and inverter;
One end ground connection of described mains switch, the other end of described mains switch is connected with the positive pole of described battery by described the 3rd resistance;
The CLK end of described T trigger is connected with the other end of described mains switch, and the Q end of described T trigger is connected with the control end of described the first switch;
The input of described inverter is connected with the Q end of described T trigger, and the output of described inverter is connected with the T end of described T trigger.
Preferably, described second switch is the electronic switch that control end is in conducting state when receiving high level, and described battery management circuit also comprises: the second switch enable circuits;
Described second switch enable circuits comprises: mains switch, the 3rd resistance, T trigger and inverter;
One end ground connection of described mains switch, the other end of described mains switch is connected with the positive pole of described battery by described the 3rd resistance;
The CLK end of described T trigger is connected with the other end of described mains switch, and the Q end of described T trigger is connected with the control end of described second switch;
The input of described inverter is connected with the Q end of described T trigger, and the output of described inverter is connected with the T end of described T trigger.
Preferably, the CLR of described T trigger end is connected with the shutdown module;
Described shutdown module is used for when receiving off signal, and the output reset signal is given the CLR end of described T trigger.
Preferably, described T trigger is the T trigger that trailing edge triggers upset.
Preferably, described T trigger is the T trigger that rising edge triggers upset, also is provided with the second inverter between the other end of described T trigger and described mains switch;
The input of described the second inverter is connected with the other end of described mains switch, and the output of described the second inverter is connected with the CLK end of described T trigger.
According to a second aspect of the invention, provide a kind of terminal, described terminal comprises battery, power management chip and electric power management circuit;
Described electric power management circuit is the electric power management circuit described in the various preferred versions of first aspect or first aspect.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
The voltage that utilizes the battery in terminal to provide by the increase start-up circuit switches to conducting state with management switch by cut-off state; The problem that the switching tube that having solved needs charger could be had no progeny in off-mode ShiShimonoseki reopens; Reached and expended considerably less electric weight or do not expending under the prerequisite of electric weight, need not the effect that reopens by the switching tube that charger also can be had no progeny off-mode ShiShimonoseki.
Description of drawings
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, during the below will describe embodiment, the accompanying drawing of required use is done to introduce simply, apparently, accompanying drawing in the following describes is only 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.
Fig. 1 be in mobile terminal to relevant each assembly of power supply between connection diagram;
Fig. 2 is the structural representation of the electric power management circuit that provides of the embodiment of the present invention one;
Fig. 3 is the circuit diagram of the electric power management circuit that provides of the embodiment of the present invention two;
Fig. 4 is the circuit diagram of the electric power management circuit that provides of the embodiment of the present invention three;
Fig. 5 is the circuit diagram of the electric power management circuit that provides of the embodiment of the present invention four;
Fig. 6 is the circuit diagram of the electric power management circuit that provides of the embodiment of the present invention five.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with accompanying drawing, embodiment of the present invention is done preferably to describe in detail.
Embodiment one
Please refer to Fig. 2, it shows the structural representation of the electric power management circuit that the embodiment of the present invention one provides.This electric power management circuit can be used for the terminal such as smart mobile phone, panel computer, E-book reader, MP3 and MP4.This electric power management circuit comprises: be used for to connect the management switch P1 of battery 202 and power management chip 204, the start-up circuit 220 that is connected respectively with control end with the positive pole of battery 202, management switch P1.
Start-up circuit 220 is used for utilizing the voltage that battery 202 provides that management switch P1 is switched to conducting state by cut-off state after receiving starting-up signal.
In sum, the electric power management circuit that the present embodiment provides, the voltage that utilizes the battery in terminal to provide by the increase start-up circuit switches to conducting state with management switch by cut-off state; The problem that the switching tube that having solved needs charger could be had no progeny in off-mode ShiShimonoseki reopens; Reached and expended considerably less electric weight or do not expending under the prerequisite of electric weight, need not the effect that reopens by the switching tube that charger also can be had no progeny off-mode ShiShimonoseki.
Embodiment two
Please refer to Fig. 3, it shows the circuit diagram of the electric power management circuit that the embodiment of the present invention two provides.This electric power management circuit can be used for the terminal such as smart mobile phone, panel computer, E-book reader, MP3 and MP4.As the more preferred embodiment that provides based on embodiment one, in the present embodiment, (Positive Channel Metal Oxide Semiconductor, P-channel metal-oxide-semiconductor) illustrates mainly take management switch as the PMOS switching tube.This electric power management circuit comprises: management switch P1 and start-up circuit 220.
Management switch P1 can be the PMOS switching tube.The end of management switch P1 is connected with the positive pole of battery 202, and the other end of management switch P1 is connected with power management chip 204.
Start-up circuit 220 comprises the first resistance R 1, the second resistance R 2 and the first K switch 1.Wherein:
One end of the first resistance R 1 is connected with the positive pole of battery 202 (the drain electrode S that is also management switch P1) by the first K switch 1, and the other end of the first resistance R 1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
One end of the second resistance R 2 is connected with the control end of management switch P1, the other end ground connection of the second resistance R 2.Obviously, the first resistance R 1 and the second resistance R 2 have consisted of bleeder circuit.Need to prove, the resistance of the second resistance R 2 needs enough large, and is very little to guarantee the electric weight that consumes.Simultaneously, when the resistance of the second resistance R 2 is enough large with respect to the resistance of the first resistance R 1, also can make the voltage between the drain and gate of assigning to management switch P1 very little, and this voltage is less than the conducting voltage threshold value V of management switch P1
GThat is to say, the resistance of supposing the first resistance is R1, and the resistance of the second resistance is R2, should satisfy:
V
BAT-V
BAT*R2/（R1+R2）<V
G。
Calculate as can be known R1/R2＜V according to following formula
G/ (V
BAT-V
G), wherein, V
GBe the conducting voltage threshold value of management switch P1, V
BATCathode voltage for battery 202.
The first K switch 1 is used for switching to cut-off state by conducting state after receiving starting-up signal.
Take the resistance of the first resistance R 1 as 50K, the resistance of the second resistance R 2 is 1M, and the voltage of battery 202 positive poles is that 3.8V is example, and under off-mode, management switch P1 is in cut-off state, and the first K switch 1 is in conducting state.The electric current of the bleeder circuit consumption that is comprised of the first resistance R 1 and the second resistance R 2 at this moment, equals: V
BAT/ (R1+R2)=3.8/1050000=3.62 μ A almost can ignore.Pressure reduction between the grid G of management switch P1 and drain electrode S is 3.8*1000000/1050000-3.8=-0.181V simultaneously, less than the switching threshold (more than generally wanting 0.5V) of management switch P1.
But when the user pressed the start of mains switch (not shown), the first K switch 1 can receive starting-up signal and switch to cut-off state from conducting state.At this moment, the grid G of management switch P1 is by the second resistance R 2 ground connection, and namely voltage is 0V, and the voltage of the drain electrode S of management switch P1 is V
BAT, reaching the conducting voltage threshold value of opening management switch P1, management switch P1 switches to conducting state by cut-off state.After this, battery 202 begins to power management chip 204 power supplies, can the normal boot-strap operation.
The first K switch 1 can be mechanical switch, can be also electronic switch.Illustrate as the mechanical electronic switch as example take the first K switch 1 in the present embodiment.The first K switch 1 meets following condition: after once being pressed, the first K switch 1 switches to conducting state by cut-off state, and unclamp the first K switch 1, the first K switch 1 and also can keep conducting state this moment.Only have after again being pressed, the first K switch 1 just can switch to cut-off state by conducting state, when unclamping the first K switch 1 equally, also will continue to keep cut-off state.
In sum, the electric power management circuit that the present embodiment provides includes by increase the voltage that the start-up circuit of bleeder circuit utilizes the battery in terminal to provide management switch is switched to conducting state by cut-off state; The problem that the switching tube that having solved needs charger could be had no progeny in off-mode ShiShimonoseki reopens; Reached under the prerequisite that expends considerably less electric weight, need not the effect that reopens by the switching tube that charger also can be had no progeny off-mode ShiShimonoseki.
Embodiment three
Please refer to Fig. 4, it shows the circuit diagram of the electric power management circuit that the embodiment of the present invention three provides.This electric power management circuit can be used for the terminal such as smart mobile phone, panel computer, E-book reader, MP3 and MP4.As the more preferred embodiment that provides based on embodiment two, in the present embodiment mainly to realize that by electronic switch the first K switch 1 is illustrated.This electric power management circuit comprises: management switch P1, start-up circuit 220 and the first switch driving circuit 240.
Management switch P1 can be the PMOS switching tube.The end of management switch P1 is connected with the positive pole of battery 202, and the other end of management switch P1 is connected with power management chip 204.
Start-up circuit 220 comprises the first resistance R 1, the second resistance R 2 and the first K switch 1.Wherein:
One end of the first resistance R 1 is connected with the positive pole of battery 202 (the drain electrode S that is also management switch P1) by the first K switch 1, and the other end of the first resistance R 1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
One end of the second resistance R 2 is connected with the control end of management switch P1, the other end ground connection of the second resistance R 2.Obviously, the first resistance R 1 and the second resistance R 2 have consisted of bleeder circuit.Need to prove, the resistance of the second resistance R 2 needs enough large, and is very little to guarantee the electric weight that consumes.Simultaneously, when the resistance of the second resistance R 2 is enough large with respect to the resistance of the first resistance R 1, also can make the voltage between the drain and gate of assigning to management switch P1 very little, and this voltage is less than the conducting voltage threshold value V of management switch P1
GThat is to say, the resistance of supposing the first resistance is R1, and the resistance of the second resistance is R2, should satisfy:
V
BAT-V
BAT*R2/（R1+R2）<V
G。
Calculate as can be known R1/R2＜V according to following formula
G/ (V
BAT-V
G), wherein, V
GBe the conducting voltage threshold value of management switch P1, V
BATCathode voltage for battery 202.
The first K switch 1 is used for switching to cut-off state by conducting state after receiving starting-up signal.The first K switch 1 can be electronic switch, such as PMOS pipe, and the perhaps electronic switch realized of other integrated circuit or packaged switching device etc.
The first switch driving circuit 240 is used for controlling conducting or the cut-off of the first K switch 1.The first switch driving circuit 240 comprises: mains switch P2, the 3rd resistance R 3, T trigger 242 and inverter 244.
The end ground connection of mains switch P2, the other end of mains switch P2 is connected with the positive pole of battery 202 by the 3rd resistance R 3.
The CLK end of T trigger 242 is connected with the other end of mains switch P2, and the Q end of T trigger 242 is connected with the control end of the first K switch 1.
The input of inverter 244 is connected with the Q end of T trigger 242, and the output of inverter 244 is connected with the T end of T trigger 242.
The first K switch 1 can be the electronic switch that control end is in cut-off state when receiving high level.T trigger 242 can be the T trigger that trailing edge triggers upset.Under off-mode, the CLK of T trigger 242 end is high level, and the Q end of T trigger 242 is output as low level, and at this moment, the first K switch 1 is in conducting state, and management switch P1 is in cut-off state.When user's pushing power switch P2, the CLK of T trigger 242 end has trailing edge to occur, and the Q end output high level of T trigger 242 enables the first K switch 1 and becomes cut-off state by conducting state, and correspondingly, management switch P1 becomes conducting state by cut-off state.Terminal begins to start shooting normally flow process.When the user unclamps mains switch P2, the CLK end of T trigger 242 has rising edge to occur, but because the Q end of T trigger 242 is input to the T end of T trigger 242 by inverter 244, this moment, the T end was low level, so the Q of T trigger 242 end still is output as high level, can not overturn.
The CLR end of T trigger 242 can also be connected with shutdown module 260.Shutdown module 260 is used for when receiving off signal, and the output reset signal is to the CLR end of T trigger 242.The Q end output low level of T trigger 242, the first K switch 1 keeps conducting state, and management switch P1 is in cut-off state.The terminal normal shutdown enters battery saving mode.Shutdown module 260 can comprise a pin on the mainboard of terminal, and this pin is controlled by the operating system of terminal.
Need to prove, the first K switch 1 can be also the electronic switch that control end is in conducting state when receiving high level, only need between the Q of T trigger 242 end and the first K switch 1 and second switch K2, an inverter be set more and get final product.In like manner, T trigger 242 also can adopt more general rising edge to trigger the T trigger of upset, only need between the CLK of mains switch P2 and T trigger 242 end, an inverter be set more and get final product.
In sum, the electric power management circuit that the present embodiment provides includes by increase the voltage that the start-up circuit of bleeder circuit utilizes the battery in terminal to provide management switch is switched to conducting state by cut-off state; The problem that the switching tube that having solved needs charger could be had no progeny in off-mode ShiShimonoseki reopens; Reached under the prerequisite that expends considerably less electric weight, need not the effect that reopens by the switching tube that charger also can be had no progeny off-mode ShiShimonoseki.
Embodiment four
Please refer to Fig. 5, it shows the circuit diagram of the electric power management circuit that the embodiment of the present invention four provides.This electric power management circuit can be used for the terminal such as smart mobile phone, panel computer, E-book reader, MP3 and MP4.As the more preferred embodiment that provides based on embodiment two, in the present embodiment mainly to realize that by electronic switch the first K switch 1 and second switch K2 are illustrated.This electric power management circuit comprises: management switch P1, start-up circuit 220, first/second switch drive circuit 270.
Management switch P1 can be the PMOS switching tube.The end of management switch P1 is connected with the positive pole of battery 202, and the other end of management switch P1 is connected with power management chip 204.
Start-up circuit 220 comprises the first resistance R 1, the first K switch 1 and second switch K2.Wherein:
One end of the first resistance R 1 is connected with the positive pole of battery 202 (the drain electrode S that is also management switch P1) by the first K switch 1, and the other end of the first resistance R 1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
The end of second switch K2 is connected with the control end of management switch P1, the other end ground connection of second switch K2.
The first K switch 1 is used for switching to cut-off state by conducting state after receiving starting-up signal.
Second switch K2 is used for switching to conducting state by cut-off state after receiving starting-up signal.
Continuation is take the resistance of the first resistance R 1 as 50K, the voltage of battery 202 positive poles is that 3.8V is example, and under off-mode, management switch P1 is in cut-off state, the first K switch 1 is in conducting state, and second switch is in cut-off state (can be considered as the infinitely-great resistance of resistance).At this moment, the pressure reduction between the grid G of management switch P1 and drain electrode S is almost 0, less than the switching threshold of management switch P1.
But when the user pressed the start of mains switch (not shown), the first K switch 1 can receive starting-up signal and switch to cut-off state from conducting state, and second switch K2 can receive starting-up signal and switch to conducting state from cut-off state.At this moment, the grid G of management switch P1 is by second switch K2 ground connection, and namely voltage is 0V, and the voltage of the drain electrode S of management switch P1 is V
BAT, reaching the conducting voltage threshold value of opening management switch P1, management switch P1 switches to conducting state by cut-off state.After this, battery 202 begins to power management chip 204 power supplies, can the normal boot-strap operation.
The first K switch 1 can be mechanical switch, can be also electronic switch.Illustrate as the mechanical electronic switch as example take the first K switch 1 in the present embodiment.The first K switch 1 meets following condition: after once being pressed, the first K switch 1 switches to conducting state by cut-off state, and unclamp the first K switch 1, the first K switch 1 and also can keep conducting state this moment.Only have after again being pressed, the first K switch 1 just can switch to cut-off state by conducting state, if unclamp the first K switch 1 this moment, also will continue to keep cut-off state.
Second switch K2 can be mechanical switch, can be also electronic switch.Illustrate as the mechanical electronic switch as example take second switch K2 in the present embodiment.Second switch K2 can be set to a button in appearance with the first K switch 1, second switch K2 meets following condition: after once being pressed, second switch K2 switches to cut-off state by conducting state, and unclamp second switch K2 this moment, and second switch also can be kept cut-off state.Only have after again being pressed, second switch K2 just can switch to conducting state by cut-off state, if unclamp second switch K2 this moment, also will continue to keep conducting state.
In sum, the electric power management circuit that the present embodiment provides, the voltage that utilizes the battery in terminal to provide by the increase start-up circuit switches to conducting state with management switch by cut-off state; The problem that the switching tube that having solved needs charger could be had no progeny in off-mode ShiShimonoseki reopens; Reached under the prerequisite that does not expend electric weight, need not the effect that reopens by the switching tube that charger also can be had no progeny off-mode ShiShimonoseki.
Embodiment five
Please refer to Fig. 6, it shows the circuit diagram of the electric power management circuit that the embodiment of the present invention five provides.This electric power management circuit can be used for the terminal such as smart mobile phone, panel computer, E-book reader, MP3 and MP4.As the more preferred embodiment that provides based on embodiment four, in order to obtain the effect of power saving more, mainly realize that to replace the second resistance R 2 by switch start-up circuit is illustrated in the present embodiment.This electric power management circuit comprises: management switch P1 and start-up circuit 220.
Management switch P1 can be the PMOS switching tube.The end of management switch P1 is connected with the positive pole of battery 202, and the other end of management switch P1 is connected with power management chip 204.
Start-up circuit 220 comprises the first resistance R 1, the first K switch 1 and second switch K2.Wherein:
One end of the first resistance R 1 is connected with the positive pole of battery 202 (the drain electrode S that is also management switch P1) by the first K switch 1, and the other end of the first resistance R 1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
The end of second switch K2 is connected with the control end of management switch P1, the other end ground connection of second switch K2.
The first K switch 1 is used for switching to cut-off state by conducting state after receiving starting-up signal.The first K switch 1 can be electronic switch, such as PMOS pipe, and the perhaps electronic switch realized of other integrated circuit or packaged switching device etc.
Second switch K2 is used for switching to conducting state by cut-off state after receiving starting-up signal.Second switch K2 can be electronic switch, such as MMOS pipe, and the perhaps electronic switch realized of other integrated circuit or packaged switching device etc.
First/second switch drive circuit 270 is used for controlling conducting or the cut-off of the first K switch 1, and the cut-off of second switch K2 or conducting.First/second switch drive circuit 270 comprises: mains switch P2, the 3rd resistance R 3, T trigger 272 and inverter 274.
The end ground connection of mains switch P2, the other end of mains switch P2 is connected with the positive pole of battery 202 by the 3rd resistance R 3.
The CLK end of T trigger 272 is connected with the other end of mains switch P2, and the Q end of T trigger 272 is connected with the control end of the first K switch 1 and second switch K2 respectively.
The input of inverter 274 is connected with the Q end of T trigger 272, and the output of inverter 274 is connected with the T end of T trigger 272.
The first K switch 1 can be the electronic switch that control end is in cut-off state when receiving high level, and second switch K2 can be the electronic switch that control end is in conducting state when receiving high level.T trigger 272 can be the T trigger that trailing edge triggers upset.Under off-mode, the CLK of T trigger 272 end is high level, and the Q end of T trigger 272 is output as low level, and at this moment, the first K switch 1 is in conducting state, and second switch K2 is in cut-off state, and management switch P1 is in cut-off state.When user's pushing power switch P2, the CLK of T trigger 272 end has trailing edge to occur, and the Q end output high level of T trigger 272 enables the first K switch 1 and becomes cut-off state by conducting state, and enables second switch K2 and become conducting state by cut-off state.Correspondingly, management switch P1 becomes conducting state by cut-off state.Terminal begins to start shooting normally flow process.When the user unclamps mains switch P2, the CLK end of T trigger 272 has rising edge to occur, but because the Q end of T trigger 272 is input to the T end of T trigger 272 by inverter 274, this moment, the T end was low level, so the Q of T trigger 272 end still is output as high level, can not overturn.
The CLR end of T trigger 272 can also be connected with shutdown module 260.Shutdown module 260 is used for when receiving off signal, and the output reset signal is to the CLR end of T trigger 272.The Q end output low level of T trigger 272, the first K switch 1 keeps conducting state, and second switch K2 is in cut-off state, and management switch P1 is in cut-off state.The terminal normal shutdown enters battery saving mode.Shutdown module 260 can comprise a pin on the mainboard of terminal, and this pin is controlled by the operating system of terminal.
Need to prove, only share same drive circuit with the first K switch 1 and second switch K2 in the present embodiment and illustrate.But should recognize, second switch K1 and second switch K2 can have respectively drive circuit separately.The first K switch 1 can be also the electronic switch that control end is in conducting state when receiving high level; Second switch K2 can be also the electronic switch that control end is in cut-off state when receiving high level, only need between the Q of T trigger 272 end and the first K switch 1 and second switch K2, an inverter be set more and get final product.In like manner, T trigger 272 also can adopt more general rising edge to trigger the T trigger of upset, only need between the CLK of mains switch P2 and T trigger 272 end, an inverter be set more and get final product.
In sum, the electric power management circuit that the present embodiment provides, the voltage that utilizes the battery in terminal to provide by the increase start-up circuit switches to conducting state with management switch by cut-off state; The problem that the switching tube that having solved needs charger could be had no progeny in off-mode ShiShimonoseki reopens; Reached under the prerequisite of consumes battery electric weight not, need not the effect that reopens by the switching tube that charger also can be had no progeny off-mode ShiShimonoseki.
The invention described above embodiment sequence number does not represent the quality of embodiment just to description.
One of ordinary skill in the art will appreciate that all or part of step that realizes above-described embodiment can complete by hardware, also can come the relevant hardware of instruction to complete by program, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium of mentioning can be read-only memory, disk or CD etc.
The above is only preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a battery management circuit, is characterized in that, described circuit comprises: be used for to connect the management switch of battery and power management chip, the start-up circuit that is connected respectively with control end with the positive pole of described battery, described management switch;
Described start-up circuit is used for after receiving starting-up signal, utilizes the voltage that the positive pole of described battery provides that described management switch is switched to conducting state by cut-off state.
2. battery management circuit according to claim 1, is characterized in that, described management switch is the PMOS switching tube, and described start-up circuit comprises: the first resistance, the second resistance and the first switch;
One end of described the first resistance is connected with the positive pole of described battery by described the first switch, and the other end of described the first resistance is connected with the control end of described management switch;
One end of described the second resistance is connected with the control end of described management switch, the other end ground connection of described the second resistance;
Described the first switch is used for switching to cut-off state by conducting state after receiving starting-up signal;
The ratio of the resistance R2 of the resistance R1 of described the first resistance and described the second resistance satisfies:
R1/R2＜V
G/ (V
BAT-V
G), wherein, V
GBe the conducting voltage threshold value of described management switch, V
BATCathode voltage for described battery.
3. battery management circuit according to claim 2, is characterized in that, described the first switch is the electronic switch that control end is in cut-off state when receiving high level, and described battery management circuit also comprises: the first switch enable circuit;
Described the first switch enable circuit comprises: mains switch, the 3rd resistance, T trigger and inverter;
One end ground connection of described mains switch, the other end of described mains switch is connected with the positive pole of described battery by described the 3rd resistance;
The CLK end of described T trigger is connected with the other end of described mains switch, and the Q end of described T trigger is connected with the control end of described the first switch;
The input of described inverter is connected with the Q end of described T trigger, and the output of described inverter is connected with the T end of described T trigger.
4. battery management circuit according to claim 1, is characterized in that, described management switch is the PMOS switching tube, and described start-up circuit comprises: the first resistance, the first switch and second switch;
One end of described the first resistance is connected with the positive pole of described battery by described the first switch, and the other end of described the first resistance is connected with the control end of described management switch;
One end of described second switch is connected with the control end of described management switch, the other end ground connection of described second switch;
Described the first switch is used for switching to cut-off state by conducting state after receiving starting-up signal;
Described second switch is used for switching to conducting state by cut-off state after receiving starting-up signal.
5. battery management circuit according to claim 4, is characterized in that, described the first switch is the electronic switch that control end is in cut-off state when receiving high level, and described battery management circuit also comprises: the first switch enable circuit;
Described the first switch enable circuit comprises: mains switch, the 3rd resistance, T trigger and inverter;
One end ground connection of described mains switch, the other end of described mains switch is connected with the positive pole of described battery by described the 3rd resistance;
The CLK end of described T trigger is connected with the other end of described mains switch, and the Q end of described T trigger is connected with the control end of described the first switch;
The input of described inverter is connected with the Q end of described T trigger, and the output of described inverter is connected with the T end of described T trigger.
6. battery management circuit according to claim 5, is characterized in that, described second switch is the electronic switch that control end is in conducting state when receiving high level, and described battery management circuit also comprises: the second switch enable circuits;
Described second switch enable circuits comprises: mains switch, the 3rd resistance, T trigger and inverter;
One end ground connection of described mains switch, the other end of described mains switch is connected with the positive pole of described battery by described the 3rd resistance;
The CLK end of described T trigger is connected with the other end of described mains switch, and the Q end of described T trigger is connected with the control end of described second switch;
The input of described inverter is connected with the Q end of described T trigger, and the output of described inverter is connected with the T end of described T trigger.
7. according to claim 3,5 or 6 arbitrary described electric power management circuits, is characterized in that, the CLR end of described T trigger is connected with the shutdown module;
Described shutdown module is used for when receiving off signal, and the output reset signal is given the CLR end of described T trigger.
8. according to claim 3,5 or 6 arbitrary described electric power management circuits, is characterized in that, described T trigger is the T trigger that trailing edge triggers upset.
9. according to claim 3,5 or 6 arbitrary described electric power management circuits, is characterized in that, described T trigger is the T trigger that rising edge triggers upset, also is provided with the second inverter between the other end of described T trigger and described mains switch;
The input of described the second inverter is connected with the other end of described mains switch, and the output of described the second inverter is connected with the CLK end of described T trigger.
10. a terminal, is characterized in that, described terminal comprises battery, power management chip and electric power management circuit;
Described electric power management circuit is as arbitrary described electric power management circuit in claim 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310047399.4A CN103107577B (en) | 2013-02-05 | 2013-02-05 | Battery management circuit and terminal |
| CN201510009542.XA CN104600797B (en) | 2013-02-05 | 2013-02-05 | Battery management circuit and terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310047399.4A CN103107577B (en) | 2013-02-05 | 2013-02-05 | Battery management circuit and terminal |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510009542.XA Division CN104600797B (en) | 2013-02-05 | 2013-02-05 | Battery management circuit and terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103107577A true CN103107577A (en) | 2013-05-15 |
| CN103107577B CN103107577B (en) | 2015-06-24 |
Family
ID=48315227
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310047399.4A Active CN103107577B (en) | 2013-02-05 | 2013-02-05 | Battery management circuit and terminal |
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| Country | Link |
|---|---|
| CN (1) | CN103107577B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104795858A (en) * | 2015-03-27 | 2015-07-22 | 小米科技有限责任公司 | Charging method and device |
| CN106033968A (en) * | 2015-03-19 | 2016-10-19 | 富港电子（东莞）有限公司 | Power saving circuit and electronic equipment with power saving circuit |
| CN109980726A (en) * | 2019-03-29 | 2019-07-05 | 维沃移动通信有限公司 | A kind of charging control circuit and terminal |
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| WO2001019126A1 (en) * | 1999-09-03 | 2001-03-15 | Neopoint, Inc. | Automatic power-on feature for wireless communication device |
| CN2779456Y (en) * | 2005-01-20 | 2006-05-10 | 英业达股份有限公司 | Electrical power control unit (EPCU) with reduced shutdown power consumption |
| CN100501641C (en) * | 2004-09-06 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Starting circuit for decreasing stand-by power consumption of notebook computer |
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2013
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001019126A1 (en) * | 1999-09-03 | 2001-03-15 | Neopoint, Inc. | Automatic power-on feature for wireless communication device |
| CN100501641C (en) * | 2004-09-06 | 2009-06-17 | 鸿富锦精密工业（深圳）有限公司 | Starting circuit for decreasing stand-by power consumption of notebook computer |
| CN2779456Y (en) * | 2005-01-20 | 2006-05-10 | 英业达股份有限公司 | Electrical power control unit (EPCU) with reduced shutdown power consumption |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106033968A (en) * | 2015-03-19 | 2016-10-19 | 富港电子（东莞）有限公司 | Power saving circuit and electronic equipment with power saving circuit |
| CN104795858A (en) * | 2015-03-27 | 2015-07-22 | 小米科技有限责任公司 | Charging method and device |
| CN109980726A (en) * | 2019-03-29 | 2019-07-05 | 维沃移动通信有限公司 | A kind of charging control circuit and terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103107577B (en) | 2015-06-24 |
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