CN103107577B - Battery management circuit and terminal - Google Patents
Battery management circuit and terminal Download PDFInfo
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- CN103107577B CN103107577B CN201310047399.4A CN201310047399A CN103107577B CN 103107577 B CN103107577 B CN 103107577B CN 201310047399 A CN201310047399 A CN 201310047399A CN 103107577 B CN103107577 B CN 103107577B
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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
The such as mobile terminal of smart mobile phone, panel computer and E-book reader and so on 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 illustrates 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 shutdown, management switch P1 to be normally in conducting state.Although now system is not activated, power management chip 108 and some other circuit remain power consumption.Known through measuring, this shutdown electric current is probably at about 0.2mA, very little, almost negligible relative to electric current during normal use.Such as, but in some occasion, this shutdown electric current will have an impact, and: this mobile terminal is the mobile phone of not pluggable battery, also namely when storing, battery is non-removable, can only be contained in mobile phone and make battery last power consumption.The capacity supposing battery 106 is 1600mA, and calculate according to 70% of this electricity when dispatching from the factory, then the battery electric quantity in battery 106 can maintain 1600*0.7/ (0.2*24)=233 day.That is, if mobile phone did not use more than 233 days after dispatching from the factory, mobile phone will be caused 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 cannot using state.In addition, some power management chip 108 also exists certain defect, when not starting shooting, running status is uncertain, the on-line operation of some DC-DC (DC-to-DC) circuit may be caused, such shutdown electric current will arrive mA rank, calculate with 5mA, then the battery electric quantity in this battery 106 can maintain 1600*0.7/ (5*24)=9 day.For this reason, during some mobile phone shutdown, by switch control module 110 management switch P1 can be given tacit consent to and turn off, battery 106 and power management chip 108 are disconnected, thus makes battery 106 can not power consumption.
Realizing in process of the present invention, inventor finds that background technology at least exists following problem: turn off if given tacit consent to by management switch P1 during shutdown, then because power management chip 108 is not powered when shutting down, make must insert charger during start, the power supply utilizing charger to provide carrys out control switch control module 110 and management switch P1 is opened, and then powers to power management chip 108 by battery 106.Obviously, under this kind of scheme, if user does not carry charger, cannot start shooting, there is larger defect.
Summary of the invention
In order to solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened, embodiments provide 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, comprising: for connecting the management switch of battery and power management chip, and the start-up circuit be connected respectively with the positive pole of described battery, the control end of described management switch;
Described start-up circuit, for after receiving starting-up signal, described management switch is switched to conducting state by cut-off state by the voltage utilizing described battery to provide;
Described management switch is PMOS switch pipe, and described start-up circuit, comprising: the first resistance, the second resistance and the first switch; One end of described first resistance is connected with the positive pole of described battery by described first switch, and the other end of described first resistance is connected with the control end of described management switch; One end of described second resistance is connected with the control end of described management switch, the other end ground connection of described second resistance; Described first switch, for after receiving starting-up signal, switches to cut-off state by conducting state; The ratio of the resistance R1 of described first resistance and the resistance R2 of described second resistance meets: R1/R2<V
g/ (V
bAT-V
g), wherein, V
gfor the conducting voltage threshold value of described management switch, V
bATfor the cathode voltage of described battery.
Preferably, described 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 first switch enable circuit, comprising: 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 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 first switch;
The input of described inverter is held with the Q of described T trigger and is connected, and the output of described inverter is held with the T of described T trigger and is connected.
Preferably, the CLR end of described T trigger is connected with shutdown module;
Described shutdown module, for when receiving off signal, exporting reset signal and holding to the CLR 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, is also provided with the second inverter between described T trigger and the other end of described mains switch;
The input of described second inverter is connected with the other end of described mains switch, and the output of described second inverter is held with the CLK of described T trigger and is connected.
According to a second aspect of the invention, provide a kind of battery management circuit, described circuit, comprising: for connecting the management switch of battery and power management chip, and the start-up circuit be connected respectively with the positive pole of described battery, the control end of described management switch;
Described start-up circuit, for after receiving starting-up signal, described management switch is switched to conducting state by cut-off state by the voltage utilizing described battery to provide;
Described start-up circuit, for after receiving starting-up signal, described management switch is switched to conducting state by cut-off state by the voltage utilizing the positive pole of described battery to provide; Described management switch is PMOS switch pipe, and described start-up circuit, comprising: the first resistance, the first switch and second switch; One end of described first resistance is connected with the positive pole of described battery by described first switch, and the other end of described 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 first switch, for after receiving starting-up signal, switches to cut-off state by conducting state; Described second switch, for after receiving starting-up signal, switches to conducting state by cut-off state.
Preferably, described 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 first switch enable circuit, comprising: 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 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 first switch;
The input of described inverter is held with the Q of described T trigger and is connected, and the output of described inverter is held with the T of described T trigger and is connected.
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: second switch enable circuits;
Described second switch enable circuits, comprising: 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 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 held with the Q of described T trigger and is connected, and the output of described inverter is held with the T of described T trigger and is connected.
Preferably, the CLR end of described T trigger is connected with shutdown module;
Described shutdown module, for when receiving off signal, exporting reset signal and holding to the CLR 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, is also provided with the second inverter between described T trigger and the other end of described mains switch;
The input of described second inverter is connected with the other end of described mains switch, and the output of described second inverter is held with the CLK of described T trigger and is connected.
According to a third aspect of the invention we, provide a kind of terminal, described terminal comprises battery, power management chip and battery management circuit;
Battery management circuit described in the various preferred versions of the various preferred versions that described battery management circuit is such as first aspect, first aspect, second aspect or second aspect.
The beneficial effect that the technical scheme that the embodiment of the present invention provides is brought is:
Management switch is switched to conducting state by cut-off state by the voltage utilizing the battery in terminal to provide by increasing start-up circuit; Solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened; Reach expend considerably less electricity or do not expend electricity prerequisite under, without the need to the effect that also switching tube had no progeny in off-mode ShiShimonoseki can be reopened by charger.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the connection diagram between each assembly relevant to power supply in mobile terminal;
Fig. 2 is the structural representation of the electric power management circuit that the embodiment of the present invention one provides;
Fig. 3 is the circuit diagram of the electric power management circuit that the embodiment of the present invention two provides;
Fig. 4 is the circuit diagram of the electric power management circuit that the embodiment of the present invention three provides;
Fig. 5 is the circuit diagram of the electric power management circuit that the embodiment of the present invention four provides;
Fig. 6 is the circuit diagram of the electric power management circuit that the embodiment of the present invention five provides.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is preferably described in detail.
Embodiment one
Please refer to Fig. 2, it illustrates the structural representation of the electric power management circuit that the embodiment of the present invention one provides.This electric power management circuit may be used in the terminal of such as smart mobile phone, panel computer, E-book reader, MP3 and MP4 and so on.This electric power management circuit, comprising: for connecting the management switch P1 of battery 202 and power management chip 204, and the start-up circuit 220 be connected respectively with the positive pole of battery 202, the control end of management switch P1.
Start-up circuit 220, for after receiving starting-up signal, management switch P1 is switched to conducting state by cut-off state by the voltage utilizing battery 202 to provide.
In sum, the electric power management circuit that the present embodiment provides, management switch is switched to conducting state by cut-off state by the voltage utilizing the battery in terminal to provide by increasing start-up circuit; Solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened; Reach expend considerably less electricity or do not expend electricity prerequisite under, without the need to the effect that also switching tube had no progeny in off-mode ShiShimonoseki can be reopened by charger.
Embodiment two
Please refer to Fig. 3, it illustrates the circuit diagram of the electric power management circuit that the embodiment of the present invention two provides.This electric power management circuit may be used in the terminal of such as smart mobile phone, panel computer, E-book reader, MP3 and MP4 and so on.As the more preferred embodiment provided based on embodiment one, main in the present embodiment is that PMOS switch pipe (Positive Channel Metal Oxide Semiconductor, P-channel metal-oxide-semiconductor) illustrates with management switch.This electric power management circuit, comprising: management switch P1 and start-up circuit 220.
Management switch P1 can be PMOS switch pipe.One 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 R1, the second resistance R2 and the first K switch 1.Wherein:
One end of first resistance R1 is connected with the positive pole of battery 202 (the drain electrode S being also management switch P1) by the first K switch 1, and the other end of the first resistance R1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
One end of second resistance R2 is connected with the control end of management switch P1, the other end ground connection of the second resistance R2.Obviously, the first resistance R1 and the second resistance R2 constitutes bleeder circuit.It should be noted that, the resistance of the second resistance R2 needs enough large, very little to ensure the electricity consumed.Meanwhile, when the resistance of the second resistance R2 is enough large relative to the resistance of the first resistance R1, the voltage assigned between the drain and gate of management switch P1 also can be made very little, and this voltage is less than the conducting voltage threshold value V of management switch P1
g.That is, suppose that the resistance of the first resistance is R1, the resistance of the second resistance is R2, then should meet:
V
BAT-V
BAT*R2/(R1+R2)<V
G。
Calculate known according to above formula, R1/R2<V
g/ (V
bAT-V
g), wherein, V
gfor the conducting voltage threshold value of management switch P1, V
bATfor the cathode voltage of battery 202.
First K switch 1, for after receiving starting-up signal, switches to cut-off state by conducting state.
With the resistance of the first resistance R1 for 50K, the resistance of the second resistance R2 is 1M, and the voltage of battery 202 positive pole is 3.8V is example, and in the power-offstate, management switch P1 is in cut-off state, and the first K switch 1 is in conducting state.Now, the electric current of the bleeder circuit consumption be made up of the first resistance R1 and the second resistance R2 equals: V
bAT/ (R1+R2)=3.8/1050000=3.62 μ A, almost negligible.Pressure reduction simultaneously between the grid G of management switch P1 and drain electrode S is 3.8*1000000/1050000-3.8=-0.181V, is less than the switching threshold (generally wanting more than 0.5V) of management switch P1.
But when user presses 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.Now, the grid G of management switch P1 is by the second resistance R2 ground connection, and namely voltage is 0V, and the voltage of the drain electrode S of management switch P1 is V
bAT, reach the conducting voltage threshold value opening management switch P1, management switch P1 switches to conducting state by cut-off state.After this, battery 202 starts to power to power management chip 204, can run by normal boot-strap.
First K switch 1 can be mechanical switch, also can be electronic switch.Illustrate for mechanical electronic switch for the first K switch 1 in the present embodiment.First K switch 1 meets following condition: after being once pressed, and the first K switch 1 switches to conducting state by cut-off state, now unclamps the first K switch 1, first K switch 1 and also can maintain conducting state.Only have after being again 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 maintain cut-off state.
In sum, the electric power management circuit that the present embodiment provides, management switch is switched to conducting state by cut-off state by the voltage that the start-up circuit including bleeder circuit by increase utilizes the battery in terminal to provide; Solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened; Reach under the prerequisite expending considerably less electricity, without the need to the effect that also switching tube had no progeny in off-mode ShiShimonoseki can be reopened by charger.
Embodiment three
Please refer to Fig. 4, it illustrates the circuit diagram of the electric power management circuit that the embodiment of the present invention three provides.This electric power management circuit may be used in the terminal of such as smart mobile phone, panel computer, E-book reader, MP3 and MP4 and so on.As the more preferred embodiment provided based on embodiment two, be mainly illustrated to be realized the first K switch 1 by electronic switch in the present embodiment.This electric power management circuit, comprising: management switch P1, start-up circuit 220 and the first switch driving circuit 240.
Management switch P1 can be PMOS switch pipe.One 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 R1, the second resistance R2 and the first K switch 1.Wherein:
One end of first resistance R1 is connected with the positive pole of battery 202 (the drain electrode S being also management switch P1) by the first K switch 1, and the other end of the first resistance R1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
One end of second resistance R2 is connected with the control end of management switch P1, the other end ground connection of the second resistance R2.Obviously, the first resistance R1 and the second resistance R2 constitutes bleeder circuit.It should be noted that, the resistance of the second resistance R2 needs enough large, very little to ensure the electricity consumed.Meanwhile, when the resistance of the second resistance R2 is enough large relative to the resistance of the first resistance R1, the voltage assigned between the drain and gate of management switch P1 also can be made very little, and this voltage is less than the conducting voltage threshold value V of management switch P1
g.That is, suppose that the resistance of the first resistance is R1, the resistance of the second resistance is R2, then should meet:
V
BAT-V
BAT*R2/(R1+R2)<V
G。
Calculate known according to above formula, R1/R2<V
g/ (V
bAT-V
g), wherein, V
gfor the conducting voltage threshold value of management switch P1, V
bATfor the cathode voltage of battery 202.
First K switch 1, for after receiving starting-up signal, switches to cut-off state by conducting state.First K switch 1 can be electronic switch, such as PMOS, or electronic switch or packaged switching device etc. that other integrated circuit realizes.
First switch driving circuit 240 is for controlling conducting or the cut-off of the first K switch 1.First switch driving circuit 240 comprises: mains switch P2, the 3rd resistance R3, T trigger 242 and inverter 244.
One 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 R3.
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 held with the Q of T trigger 242 and is connected, and the output of inverter 244 is held with the T of T trigger 242 and is connected.
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.In the power-offstate, the CLK end of T trigger 242 is high level, and the Q end of T trigger 242 exports as low level, and now, the first K switch 1 is in conducting state, and management switch P1 is in cut-off state.As user's pushing power switch P2, the CLK end of T trigger 242 has trailing edge to occur, the Q end of T trigger 242 exports high level, and enable first K switch 1 becomes cut-off state from conducting state, and correspondingly, management switch P1 becomes conducting state from cut-off state.Terminal starts normal starting procedure.When user unclamps mains switch P2, T trigger 242 CLK end have rising edge to occur, but due to T trigger 242 Q end by inverter 244 be input to T trigger 242 T end, now T end is low level, so the Q end of T trigger 242 still exports as high level, can not overturn.
The CLR end of T trigger 242 can also be connected with shutdown module 260.Shutdown module 260, for when receiving off signal, exporting reset signal and holding to the CLR of T trigger 242.The Q of T trigger 242 holds output low level, and the first K switch 1 keeps conducting state, and management switch P1 is in cut-off state.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.
It should be noted that, the first K switch 1 also can be the electronic switch that control end is in conducting state when receiving high level, only need T trigger 242 Q end and between the first K switch 1 and second switch K2, an inverter is set more.In like manner, T trigger 242 also can adopt more general rising edge to trigger the T trigger of upset, only needs to arrange an inverter between the CLK of mains switch P2 and T trigger 242 holds more.
In sum, the electric power management circuit that the present embodiment provides, management switch is switched to conducting state by cut-off state by the voltage that the start-up circuit including bleeder circuit by increase utilizes the battery in terminal to provide; Solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened; Reach under the prerequisite expending considerably less electricity, without the need to the effect that also switching tube had no progeny in off-mode ShiShimonoseki can be reopened by charger.
Embodiment four
Please refer to Fig. 5, it illustrates the circuit diagram of the electric power management circuit that the embodiment of the present invention four provides.This electric power management circuit may be used in the terminal of such as smart mobile phone, panel computer, E-book reader, MP3 and MP4 and so on.As the more preferred embodiment provided based on embodiment two, mainly to realize the first K switch 1 by electronic switch and second switch K2 is illustrated in the present embodiment.This electric power management circuit, comprising: management switch P1, start-up circuit 220, first/second switch drive circuit 270.
Management switch P1 can be PMOS switch pipe.One 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 R1, the first K switch 1 and second switch K2.Wherein:
One end of first resistance R1 is connected with the positive pole of battery 202 (the drain electrode S being also management switch P1) by the first K switch 1, and the other end of the first resistance R1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
One end of second switch K2 is connected with the control end of management switch P1, the other end ground connection of second switch K2.
First K switch 1, for after receiving starting-up signal, switches to cut-off state by conducting state.
Second switch K2 is used for after receiving starting-up signal, switches to conducting state by cut-off state.
Continue with the resistance of the first resistance R1 as 50K, the voltage of battery 202 positive pole is 3.8V is example, and in the power-offstate, management switch P1 is in cut-off state, 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).Now, the pressure reduction between the grid G of management switch P1 and drain electrode S is almost 0, is less than the switching threshold of management switch P1.
But when user presses 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.Now, 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, reach the conducting voltage threshold value opening management switch P1, management switch P1 switches to conducting state by cut-off state.After this, battery 202 starts to power to power management chip 204, can run by normal boot-strap.
First K switch 1 can be mechanical switch, also can be electronic switch.Illustrate for mechanical electronic switch for the first K switch 1 in the present embodiment.First K switch 1 meets following condition: after being once pressed, and the first K switch 1 switches to conducting state by cut-off state, now unclamps the first K switch 1, first K switch 1 and also can maintain conducting state.Only have after being again pressed, the first K switch 1 just can switch to cut-off state by conducting state, if now unclamp the first K switch 1, also will continue to maintain cut-off state.
Second switch K2 can be mechanical switch, also can be electronic switch.In the present embodiment for second switch K2 for mechanical electronic switch illustrates.Second switch K2 can be set to a button in appearance with the first K switch 1, second switch K2 meets following condition: after being once pressed, second switch K2 switches to cut-off state by conducting state, now unclamps second switch K2, and second switch also can maintain cut-off state.Only have after being again pressed, second switch K2 just can switch to conducting state by cut-off state, if now unclamp second switch K2, also will continue to maintain conducting state.
In sum, the electric power management circuit that the present embodiment provides, management switch is switched to conducting state by cut-off state by the voltage utilizing the battery in terminal to provide by increasing start-up circuit; Solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened; Reach under the prerequisite not expending electricity, without the need to the effect that also switching tube had no progeny in off-mode ShiShimonoseki can be reopened by charger.
Embodiment five
Please refer to Fig. 6, it illustrates the circuit diagram of the electric power management circuit that the embodiment of the present invention five provides.This electric power management circuit may be used in the terminal of such as smart mobile phone, panel computer, E-book reader, MP3 and MP4 and so on.As the more preferred embodiment provided based on embodiment four, in order to obtain the effect of power saving more, mainly realizing start-up circuit be illustrated to be replaced the second resistance R2 by switch in the present embodiment.This electric power management circuit, comprising: management switch P1 and start-up circuit 220.
Management switch P1 can be PMOS switch pipe.One 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 R1, the first K switch 1 and second switch K2.Wherein:
One end of first resistance R1 is connected with the positive pole of battery 202 (the drain electrode S being also management switch P1) by the first K switch 1, and the other end of the first resistance R1 is connected with the control end of management switch P1, is also the grid G of management switch P1.
One end of second switch K2 is connected with the control end of management switch P1, the other end ground connection of second switch K2.
First K switch 1, for after receiving starting-up signal, switches to cut-off state by conducting state.First K switch 1 can be electronic switch, such as PMOS, or electronic switch or packaged switching device etc. that other integrated circuit realizes.
Second switch K2 is used for after receiving starting-up signal, switches to conducting state by cut-off state.Second switch K2 can be electronic switch, such as MMOS pipe, or electronic switch or packaged switching device etc. that other integrated circuit realizes.
First/second switch drive circuit 270 is 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 R3, T trigger 272 and inverter 274.
One 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 R3.
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 second switch K2 with the first K switch 1 respectively.
The input of inverter 274 is held with the Q of T trigger 272 and is connected, and the output of inverter 274 is held with the T of T trigger 272 and is connected.
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.In the power-offstate, the CLK end of T trigger 272 is high level, and the Q end of T trigger 272 exports as low level, and now, 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.As user's pushing power switch P2, the CLK end of T trigger 272 has trailing edge to occur, the Q end of T trigger 272 exports high level, and enable first K switch 1 becomes cut-off state from conducting state, and enable second switch K2 becomes conducting state from cut-off state.Correspondingly, management switch P1 becomes conducting state from cut-off state.Terminal starts normal starting procedure.When user unclamps mains switch P2, T trigger 272 CLK end have rising edge to occur, but due to T trigger 272 Q end by inverter 274 be input to T trigger 272 T end, now T end is low level, so the Q end of T trigger 272 still exports as high level, can not overturn.
The CLR end of T trigger 272 can also be connected with shutdown module 260.Shutdown module 260, for when receiving off signal, exporting reset signal and holding to the CLR of T trigger 272.The Q of T trigger 272 holds output low level, and 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.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.
It should be noted that, only share same drive circuit to illustrate with the first K switch 1 and second switch K2 in the present embodiment.But should recognize, second switch K1 and second switch K2 can have respective drive circuit respectively.First K switch 1 also can be the electronic switch that control end is in conducting state when receiving high level; Second switch K2 also can be the electronic switch that control end is in cut-off state when receiving high level, only need T trigger 272 Q end and between the first K switch 1 and second switch K2, an inverter is set more.In like manner, T trigger 272 also can adopt more general rising edge to trigger the T trigger of upset, only needs to arrange an inverter between the CLK of mains switch P2 and T trigger 272 holds more.
In sum, the electric power management circuit that the present embodiment provides, management switch is switched to conducting state by cut-off state by the voltage utilizing the battery in terminal to provide by increasing start-up circuit; Solve the problem needing charger the switching tube had no progeny in off-mode ShiShimonoseki could be reopened; Reach under the prerequisite of not consumes battery electricity, without the need to the effect that also switching tube had no progeny in off-mode ShiShimonoseki can be reopened by charger.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a battery management circuit, is characterized in that, described circuit, comprising: for connecting the management switch of battery and power management chip, and the start-up circuit be connected respectively with the positive pole of described battery, the control end of described management switch;
Described start-up circuit, for after receiving starting-up signal, described management switch is switched to conducting state by cut-off state by the voltage utilizing the positive pole of described battery to provide;
Described management switch is PMOS switch pipe, and described start-up circuit, comprising: the first resistance, the second resistance and the first switch; One end of described first resistance is connected with the positive pole of described battery by described first switch, and the other end of described first resistance is connected with the control end of described management switch; One end of described second resistance is connected with the control end of described management switch, the other end ground connection of described second resistance; Described first switch, for after receiving starting-up signal, switches to cut-off state by conducting state; The ratio of the resistance R1 of described first resistance and the resistance R2 of described second resistance meets: R1/R2<V
g/ (V
bAT-V
g), wherein, V
gfor the conducting voltage threshold value of described management switch, V
bATfor the cathode voltage of described battery.
2. battery management circuit according to claim 1, is characterized in that, described 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 first switch enable circuit, comprising: 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 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 first switch;
The input of described inverter is held with the Q of described T trigger and is connected, and the output of described inverter is held with the T of described T trigger and is connected.
3. battery management circuit according to claim 2, is characterized in that, the CLR end of described T trigger is connected with shutdown module;
Described shutdown module, for when receiving off signal, exporting reset signal and holding to the CLR of described T trigger.
4. battery management circuit according to claim 2, is characterized in that, described T trigger is the T trigger that trailing edge triggers upset.
5. battery management circuit according to claim 2, is characterized in that, described T trigger is the T trigger that rising edge triggers upset, is also provided with the second inverter between described T trigger and the other end of described mains switch;
The input of described second inverter is connected with the other end of described mains switch, and the output of described second inverter is held with the CLK of described T trigger and is connected.
6. a terminal, is characterized in that, described terminal comprises battery, power management chip and battery management circuit;
Described battery management circuit is as the battery management circuit as described in arbitrary in claim 1 to 5.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510009542.XA CN104600797B (en) | 2013-02-05 | 2013-02-05 | Battery management circuit and terminal |
| CN201310047399.4A CN103107577B (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 |
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| Publication Number | Publication Date |
|---|---|
| CN103107577A CN103107577A (en) | 2013-05-15 |
| CN103107577B true CN103107577B (en) | 2015-06-24 |
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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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Families Citing this family (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 |
| CN109980726B (en) * | 2019-03-29 | 2021-01-08 | 维沃移动通信有限公司 | Charging control circuit and terminal |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Family Cites Families (1)
| 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 |
-
2013
- 2013-02-05 CN CN201310047399.4A patent/CN103107577B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| CN103107577A (en) | 2013-05-15 |
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