CN102664435B - Charging management circuit - Google Patents
Charging management circuit Download PDFInfo
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- CN102664435B CN102664435B CN201210137284.XA CN201210137284A CN102664435B CN 102664435 B CN102664435 B CN 102664435B CN 201210137284 A CN201210137284 A CN 201210137284A CN 102664435 B CN102664435 B CN 102664435B
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- 238000007600 charging Methods 0.000 title claims abstract description 64
- 230000000052 comparative effect Effects 0.000 claims description 20
- 238000005070 sampling Methods 0.000 claims description 11
- 238000007599 discharging Methods 0.000 abstract description 5
- 239000003990 capacitor Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 238000012512 characterization method Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010277 constant-current charging Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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Abstract
The invention discloses a charging management circuit, which comprises a power supply control circuit, an output circuit, a charging and discharging switch and a charging and discharging control circuit, wherein the charging and discharging switch is connected between an internal system node and a battery charging node; the input end of the output circuit is connected with an external charging node; the output end of the output circuit is connected with the internal system node; the voltage of the external charging node is adjusted into the voltage of the internal system node according to the control of the power supply control circuit; and the charging and discharging control circuit is used for controlling the charging switch. According to the charging management circuit, the use of a power switch can be reduced, and the cost of the charging management circuit is reduced.
Description
[technical field]
The present invention relates to electronic circuit field, particularly a kind of charge management circuit.
[background technology]
Charge management circuit can be used to extend the useful life of lithium battery and the fail safe that improves lithium battery conventionally.Charge management circuit comprises switching mode charge management circuit and linear model charge management circuit.Wherein, switching mode charge management circuit is widely used in relating in the charging management chip of large electric current because of its high efficiency characteristic.
Please refer to shown in Fig. 1, it is the circuit diagram of switching mode charge management circuit in prior art.This charge management circuit comprises K switch 1, K switch 2, K switch 3 and K switch 4, charging control circuit 110, power-supplying circuit 120, inductance L 1, capacitor C 1 and capacitor C 2.Wherein, K switch 1 and K switch 2 are connected between external charge node VCHG and ground successively; Inductance L 1 and capacitor C 1 are connected between the intermediate node and ground between K switch 1 and K switch 2 successively, and the intermediate node between inductance L 1 and capacitor C 1 is connected with battery charge node VBAT; The positive and negative electrode of battery BAT is connected with ground with battery charge node VBAT respectively; K switch 3 and capacitor C 2 are connected between battery charging connected node VBAT and ground successively, and wherein, the intermediate node between K switch 3 and capacitor C 2 is connected with built-in system supply node VSYS; K switch 4 is connected between node VCHG and node VSYS; The input of charging control circuit 110 is connected with node VBAT, and two output is connected with the control end of K switch 2 with the control end of K switch 1 respectively; Two outputs of power-supplying circuit 120 are connected with the control end of K switch 4 with the control end of K switch 3 respectively.
The operation principle of this switching mode charge management circuit is as follows.
When node VCHG is connected to adapter (Adapter, conventionally formed by AC-DC transducer) time, if and the voltage of battery BAT is in the time of underfill state, charging control circuit 110 charges to battery BAT by control switch K1 and K switch 2, power-supplying circuit 120 is by control switch K4 conducting simultaneously, K switch 3 is ended, make node VCHG to node VSYS power supply, node VSYS is conventionally connected to voltage regulator (Regulator) or DC-to-DC converter (DC-DCconverter) is built-in system power supply.In the time that built-in system power consumption is larger, preferentially meet system power consumption, suitably reduce the charging current to battery BAT.In the time that built-in system power consumption is greater than the available maximum current of node VCHG, charging current to battery BAT is decreased to zero, and by power-supplying circuit 120 control switch K3 conductings, now K switch 4 and K switch 3 conductings are simultaneously system power supply by node VCHG and battery BAT simultaneously.
In the time that node VCHG is not connected to adapter, by power-supplying circuit 120 control switch K3 conductings, K4 disconnects, and by battery BAT, node VSYS is powered.
In charge management circuit as shown in Figure 1, because K switch 1 ~ K4 is power switch, require the conducting resistance of switch very little, therefore, no matter charging control circuit is to be integrated in chip, or forms with discrete device form, and its cost is all very high.
For this reason, be necessary to provide a kind of new technical scheme to solve the problems referred to above.
[summary of the invention]
The object of this part is to summarize some aspects of embodiments of the invention and briefly introduces some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit to avoid the making object of this part, specification digest and denomination of invention fuzzy, and this simplification or omit and can not be used for limiting the scope of the invention.
The object of the present invention is to provide a kind of charge management circuit, realizing under the prerequisite of Charge Management function, can reduce the use of power switch, and then reduced the cost of charge management circuit.
In order to reach object of the present invention, the invention provides a kind of charge management circuit, it comprises: power-supplying circuit; Output circuit, its input connects external charge node, and output connects built-in system node, and it is the voltage of built-in system node by the voltage-regulation of external charge node according to the control of described power-supplying circuit; Be connected in the charge and discharge switch between built-in system node and battery charge node; And charge-discharge control circuit, it is for controlling described charge and discharge switch.
Further, described output circuit comprises the first switch, second switch, the first inductance and the first electric capacity, the first switch and second switch are connected between external charge node and ground successively, the first inductance and the first electric capacity are connected between the intermediate node and ground between the first switch and second switch successively, the output that the intermediate node between the first inductance and the first electric capacity is described output circuit.
Further, described power-supplying circuit is controlled the first switch and second switch according to the voltage of built-in system node, the voltage of battery charge node and the charging current of battery, and described charge-discharge control circuit is controlled charge and discharge switch according to the charging current of the voltage of battery charge node and battery.
Further, in the time that external charge node is not connected to adapter, the complete conducting of charge-discharge control circuit control charge and discharge switch, power-supplying circuit control the first switch and second switch turn-off.
Further, when external charge node is connected to adapter, and when the voltage of battery charge node is less than the minimum operating voltage of system, described power-supplying circuit control the first switch and second switch make the voltage of built-in system node be maintained at the minimum operating voltage of system, described charge-discharge control circuit, according to the linear conducting of the charging current control charge and discharge switch of battery, makes battery charge with constant charging current.
Further, when external charge node is connected to adapter, and the voltage of battery charge node be greater than the minimum operating voltage of system and be less than battery be full of voltage time, described power-supplying circuit is by controlling the first switch and second switch to control the voltage of built-in system node, and then to make built-in system node be still that battery charges by constant charging current, the full conducting of charge and discharge switch described in described charge-discharge control circuit control.
Further, when external charge node is connected to adapter, and the voltage of battery charge node rise to battery be full of voltage time, described power-supplying circuit makes the voltage constant of built-in system node be full of voltage in described battery by controlling the first switch and second switch, the full conducting of charge and discharge switch control charge and discharge switch and turn-off in the time that the charging current of battery is less than predetermined value described in described charge-discharge control circuit control.
Further, when external charge node is connected to adapter, and the voltage of battery charge node is less than the minimum operating voltage of system, and while being also less than predetermined voltage threshold, described charge-discharge control circuit is according to the linear conducting of the charging current control charge and discharge switch of battery, battery is charged to battery with pre-charge current, when external charge node is connected to adapter, and the voltage of battery charge node is less than the minimum operating voltage of system, and while being greater than predetermined voltage threshold, described charge-discharge control circuit is according to the linear conducting of the charging current control charge and discharge switch of battery, battery is charged to battery with the constant current charge electric current of being scheduled to.
Further, described power-supplying circuit comprises power supply control module, first selector and power supply comparison module, described power supply comparator comprises the first comparator, the second comparator, the 3rd comparator and the 4th comparator, described power supply control module comprises the first constant voltage control circuit, constant current/constant voltage control circuit, the second constant voltage control circuit and switching off control circuit, the first comparator is voltage and the minimum operating voltage of system of external charge node relatively, and provide the first comparative result, the second comparator is voltage and the minimum operating voltage of system of battery charge node relatively, and provide the second comparative result, the 3rd comparator compares the sampling charging current of pre-charge current value and battery, and provide the 3rd comparative result, the voltage of the 4th comparator comparison battery charge node and battery be full of voltage, and provide the 4th comparative result, first selector selects the control signal of a control circuit output in described power supply control module to control the first switch and second switch according to each comparative result, the first constant voltage control circuit is according to the Voltage-output control signal of built-in system node, the voltage constant of built-in system node is controlled to minimum operating voltage place, described constant current/constant voltage control circuit is according to the voltage of battery charge node and sampling charging current output control signal, be full of voltage place to control the voltage constant that charges take the constant current charge electric current be scheduled to as battery or control battery charge node in battery, the second constant voltage control circuit is according to the Voltage-output control signal of built-in system node, be full of voltage place with what the voltage constant of built-in system node is controlled to battery, the described output control signal that switches off control circuit, to control the shutoff of the first switch and second switch.
Further, described charge-discharge control circuit comprises and discharges and recharges control module, second selector and discharge and recharge comparison module, the described comparison module that discharges and recharges comprises the first comparator, the second comparator, the 3rd comparator and the 4th comparator, the described control module that discharges and recharges comprises precharge/constant current charge control circuit, full turn-on control circuit and switching off control circuit, the first comparator is voltage and the minimum operating voltage of system of external charge node relatively, and provide the first comparative result, the second comparator is voltage and the minimum operating voltage of system of battery charge node relatively, and provide the second comparative result, the 3rd comparator compares the sampling charging current of pre-charge current value and battery, and provide the 3rd comparative result, the voltage of the 4th comparator comparison battery charge node and battery be full of voltage, and provide the 4th comparative result, second selector is controlled charge and discharge switch according to the control signal that discharges and recharges a control circuit output in control module described in each comparative result selection, described precharge/constant current charge control circuit is according to the charging current output control signal of the voltage of battery charge node and sampling, charge and discharge switch is carried out to Linear Control, so that battery is carried out to precharge or constant current charge, described full turn-on control circuit output control signal, to control the full conducting of charge and discharge switch, the described output control signal that switches off control circuit, to control the shutoff of charge and discharge switch.
Compared with prior art, external charge node VCHG realizes the power supply to inner system node VSYS by the control of power-supplying circuit in the present invention, described built-in system node VSYS realizes the control that discharges and recharges to battery charge node VBAT by the control of charge-discharge control circuit, can reduce like this use of power switch, thereby reduce the cost of charge management circuit.
[accompanying drawing explanation]
In conjunction with reference to accompanying drawing and ensuing detailed description, the present invention will be easier to understand, wherein structure member corresponding to same Reference numeral, wherein:
Fig. 1 is the electrical block diagram of existing charge management circuit;
Fig. 2 is charge management circuit in the present invention electrical block diagram in one embodiment;
Fig. 3 is power-supplying circuit in Fig. 2 electrical block diagram in one embodiment; With
Fig. 4 is charging control circuit in Fig. 2 electrical block diagram in one embodiment.
[embodiment]
Detailed description of the present invention is mainly carried out the running of direct or indirect simulation technical solution of the present invention by program, step, logical block, process or other symbolistic descriptions.For the thorough the present invention that understands, a lot of specific detail in ensuing description, are stated.And in the time there is no these specific detail, the present invention may still can realize.Under those of skill in the art uses these descriptions herein and states the work essence of effectively introducing them to the others skilled in the art in affiliated field.In other words, be the object of the present invention of avoiding confusion, because the method for knowing, program, composition and circuit are readily appreciated that, therefore they are not described in detail.
Alleged " embodiment " or " embodiment " refers to special characteristic, structure or the characteristic that can be contained at least one implementation of the present invention herein.Different local in this manual " in one embodiment " that occur not all refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.In addition, represent sequence of modules in method, flow chart or the functional block diagram of one or more embodiment and revocablely refer to any particular order, not also being construed as limiting the invention.
Emphasis and the bright spot of the charge management circuit providing in the present invention are: can directly power to inner system node VSYS by controlling the first switch and the second switch that are connected in successively between external charge node VCHG and ground, the 3rd switch (also can claim charge and discharge switch) is set between built-in system node VSYS and battery charge node VBAT, realize the discharge and recharge control of built-in system node VSYS to battery charge node VBAT by Linear Control the 3rd switch, thereby reduce the number of power switch, and then reduced the cost of charge management circuit.
Please refer to shown in Fig. 2, it shows charge management circuit 200 in the present invention structural representation in one embodiment.Described charge management circuit 200 comprises the first K switch 1, second switch K2 and charge and discharge switch K3, power-supplying circuit 210, charge-discharge control circuit 220, inductance L 1, capacitor C 1 and capacitor C 2.K switch 1 and K switch 2 are connected between external charge node VCHG and ground successively; Inductance L 1 and capacitor C 1 are connected between the intermediate node and ground between K switch 1 and K switch 2 successively, and between inductance L 1 and capacitor C 1, node is connected with built-in system node VSYS; K switch 3 and capacitor C 2 are connected between node VSYS and ground successively, and the node that K switch 3 is connected with capacitor C 2 is connected with battery charge node VBAT, and the both positive and negative polarity of battery BAT is connected with ground with node VBAT respectively.
Power-supplying circuit 210 is by the actual samples charging current of voltage, the voltage of node VBAT and the charging current ISEN(battery of battery BAT of detection node VSYS) carry out the control to switch K1 and K switch 2, thus can realize the power supply to node VSYS.Charge-discharge control circuit 220 carries out the Linear Control to switch K3 by voltage and the charging current ISEN of detection node VBAT, thereby realizes the control that discharges and recharges to battery BAT.
In one embodiment, the specific works principle of described charge management circuit is as follows.
In the time that node VCHG is not connected to adapter, by the complete conducting of charge-discharge control circuit 220 control switch K3, battery BAT is to node VSYS electric discharge, for built-in system provides power supply.Power-switching circuit in built-in system is take the voltage of node VSYS as input power, for built-in system produces various needed voltage, such as 3.3V, 2.8V, 1.8V or 1.2V, the power-switching circuit that is connected to node VSYS can comprise one or more voltage regulator and DC-to-DC converter.Now, turn-offed by described power-supplying circuit 210 control switch K1 and K2.
When node, VCHG is connected to adapter, and when cell voltage VBAT is during lower than minimum operating voltage VSYS_MIN, described power-supplying circuit 210 is by voltage cut-out K1 and the K switch 2 of the node VSYS that detects, thereby the voltage of node VSYS is adjusted into the required minimum operating voltage VSYS_MIN of system, for example 3.5V, for the voltage regulator of 3.3V output, 3.5V is than the high 0.2V of 3.3V, the minimum differntial pressure that meets voltage regulator requires, realize like this cell voltage VBAT when too low, to the requirement of system power supply.
When node, VCHG is connected to adapter, and when cell voltage VBAT is lower than minimum operating voltage VSYS_MIN, also lower than pre-charge voltage threshold value (to conventional lithium battery, be generally 3.0V) time, charge-discharge control circuit 220 is according to the cell voltage VBAT detecting and the linear conducting of charging current ISEN control switch K3, now the conducting resistance of described K switch 3 is changing, with less pre-charge current Iterm (a predefined current value), battery BAT is carried out to constant current charge, be that charge-discharge control circuit 220 is operated in pre-charge current pattern, 1/10 of the battery VBAT constant current charge electric current (another predefined current value) that general pre-charge current Iterm is setting.
When node, VCHG is connected to adapter, and when cell voltage VBAT is lower than minimum operating voltage VSYS_MIN, and during higher than described pre-charge voltage threshold value, charge-discharge control circuit 220 switches to constant current charging mode battery BAT is carried out to constant current charge, now with the constant current charge electric current of being scheduled to, battery BAT is charged, along with cell voltage, VBAT constantly rises, for large constant current charge electric current is provided enough, the conducting degree of K switch 3 is constantly strengthened, its conducting resistance reduces gradually, and the conduction voltage drop on it is more and more less.
When node, VCHG is connected to adapter, and when cell voltage VBAT is higher than minimum operating voltage VSYS_MIN and when being full of voltage VBAT_FULL, described charging control circuit 220 is controlled described K switch 3, and in complete conducting state, (in actual design, K switch 3 can be PMOS transistor, the Rule of judgment of its complete conducting state can be its grid voltage about 50mv that declines), described power-supplying circuit 210 is by VSYS_MIN constant voltage state, change into take the electric current of the electric current in voltage and the K switch 3 of detection node VBAT (charging current of sampling ISEN) or K switch 1 as according to switch K1 and K switch 2 are controlled, now allow node VSYS voltage to rise with the rising of cell voltage VBAT, can be higher than 3.5V, be that described power-supplying circuit 210 is operated in constant current operating state, thereby continue to realize battery BAT is carried out to constant current charge.
When node, VCHG is connected to adapter, and cell voltage VBAT rises to and is for example full of voltage VBAT_FULL(, lithium battery is generally 4.2V) time, described charging control circuit 220 control switch K3 continue to maintain complete conducting, power-supplying circuit 210 is by voltage cut-out K1 and the K switch 2 of the node VSYS that detects, maintain the voltage of node VBAT in being full of voltage VBAT_FULL, power-supplying circuit 210 is operated in constant voltage mode.Along with battery, BAT is full of gradually, and charging current ISEN reduces gradually, and in the time that charging current ISEN is reduced to pre-charge current Iterm, 1/10 of constant current charge electric current o'clock, charging finished.In the time that charging finishes, can be designed to different schemes according to the different demands of system: a kind of design, the voltage that design continues to maintain node VBAT is 4.2V; Another kind of design can be designed to charge, control stopcock K3 by charge-discharge control circuit 220, come control switch K1 and K switch 2 by power-supplying circuit 210 according to the voltage of the node VSYS collecting, thereby the voltage that maintains node VSYS is VBAT_FULL (4.2V), also can maintain node VSYS in other magnitudes of voltage according to other considerations, such as 4.4V or VSYS MIN etc.
K switch 1 in Fig. 2 and K2, L1 and C1 have formed the output circuit of a power supply changeover device, the input of this output circuit is node VCHG, output is node VSYS, the control end of this output circuit is connected with described power-supplying circuit 210, and this output circuit is the output voltage of the node VSYS of needs by the input voltage regulation of node VCHG under the control of power-supplying circuit 210.In other embodiments, also can adopt the output circuit of other form, as long as can realize the voltage-regulation to node VSYS.
In sum, in the present invention, by power-supplying circuit 210, the control of switch K1 and K2 is realized to node VCHG to node VSYS power supply, by charge-discharge control circuit 220, the control of switch K3 is realized to discharging and recharging between node VSYS and node VBAT.With respect to prior art, reduce the quantity of power switch, thereby can reduce costs.
Please refer to shown in Fig. 3, it is power-supplying circuit 210 in Fig. 2 electrical block diagram in one embodiment.
Described power-supplying circuit comprises power supply control module, first selector and power supply comparison module.Described power supply control module comprises the first constant voltage control circuit, constant current/constant voltage control circuit, the second constant voltage control circuit and switch off control circuit.
Described the first constant voltage control circuit is according to Voltage-output control signal K1SYS and the K2SYS of node VSYS, if control signal K1SYS and K2SYS as control signal K1G and the K2G of K switch 1 and K switch 2, just can be controlled at the voltage constant of node VSYS minimum operating voltage VSYS_MIN place respectively.
Described constant current/constant voltage control circuit is according to the voltage of node VBAT and sampling charging current ISEN output control signal K1BAT and K2BAT, if this control signal K1BAT and K2BAT be respectively as control signal K1G and the K2G of K switch 1 and K switch 2, the constant current charge electric current that just can control to be scheduled to be battery charge or the voltage constant of node VBAT is controlled in to battery be full of voltage VBAT_FULL place.
Described the second constant voltage control circuit is according to Voltage-output control signal K1FUL and the K2FUL of node VSYS, if this control signal K1FUL and K2FUL as control signal K1G and the K2G of K switch 1 and K switch 2, just can be controlled at the voltage constant of node VSYS voltage VBAT_FULL place respectively.
Described switch off control circuit output control signal K1OFF and K2OFF, if this control signal K1OFF and K2OFF are respectively as control signal K1G and the K2G of K switch 1 and K switch 2, just can realize the shutoff to switch K1 and K switch 2.
Described power supply comparison module comprises the first comparison circuit Comp1, the second comparison circuit Comp2, the 3rd comparison circuit Comp3 and the 4th comparison circuit Comp4.
The voltage of the normal phase input end input node VCHG of the first comparison circuit Comp1, inverting input input reference voltage is the minimum operating voltage VSYS_MIN of system, its output output signal A.
The voltage of the normal phase input end input node VBAT of the second comparison circuit Comp2, its inverting input input reference voltage is the minimum operating voltage VSYS_MIN of system, its output output signal B.
The normal phase input end input reference electric current of the 3rd comparison circuit Comp3 is pre-charge current Iterm, and in one embodiment, pre-charge current Iterm is continuous current 1/10, its inverting input input charging current ISEN, its output output signal D.
The voltage of the normal phase input end input node VBAT of the 4th comparison circuit Comp4, its inverting input input reference voltage, this reference voltage is that battery is full of voltage VBAT_FULL, its output output signal E.
First selector is the control signal as control switch K1 and K2 according to the signal of a kind of control circuit output of signal A, the B of the output of power supply comparison module, D, E selection power supply control module.
The concrete course of work of described power-supplying circuit is as follows.
In the time that signal A is low level (represent node VCHG be not connected to adapter), no matter signal B, D, which kind of logic E be, and first selector is selected the control signal K1OFF that switches off control circuit and export, and K2OFF is to K1G and K2G.
When signal A is high level (representing that node VCHG has been connected to adapter), and signal B is low level (representing that cell voltage VBAT is lower than minimum operating voltage VSYS_MIN), no matter D, which kind of logic E is, first selector is selected the output signal K1SYS of the first constant voltage control circuit, and K2SYS is to K1G and K2G.
When signal A is high level (representing that node VCHG has been connected to adapter), and signal B is high level (representing that cell voltage VBAT is higher than minimum operating voltage VSYS_MIN), and when signal E is low level (representing that cell voltage VBAT is lower than being full of voltage VBAT_FULL), no matter signal D is any logic, first selector is selected the output K1BAT of constant current/constant voltage control circuit, K2BAT is to K1G and K2G, and now constant current/constant voltage control circuit carries out constant current charge with the constant current charge electric current of being scheduled to battery to battery.
When signal A is high level, and signal B is high level, and signal E is high level (representing that cell voltage VBAT is higher than being full of voltage VBAT_FULL), signal D is during also for high level (represent charging current be less than pre-charge current), and first selector selects the output K1FUL of the second constant voltage control circuit and K2FUL to K1G and K2G.
As signal A, B, E is high level, when signal D is low level (representing that charging current is greater than pre-charge current), first selector is selected the output K1BAT of constant current/constant voltage control circuit, K2BAT is to K1G and K2G, and what now the voltage constant of described node VBAT was controlled at battery by described constant current/constant voltage control circuit is full of voltage VBAT_FULL place.
Wherein, the first constant voltage control circuit and the second constant voltage control circuit can adopt the DC-to-DC converter implementation of constant voltage output of the prior art, and for simplified characterization, the present invention does not describe in detail to it; Constant current/constant voltage control electric current can adopt the constant current/constant voltage control circuit in switching mode charge controller in prior art, and for simplified characterization, the present invention does not describe in detail to it.
Please refer to shown in Fig. 4, it is charge-discharge control circuit in Fig. 2 structural representation in one embodiment.
Described charge-discharge control circuit comprises and discharges and recharges control module, second selector and discharge and recharge comparison module.The described control module that discharges and recharges is for exporting control signal, and it comprises precharge/constant current charge control circuit, full turn-on control circuit and switching off control circuit.
Described precharge/constant current charge control circuit is according to the voltage of node VBAT and charging current ISEN output control signal K3BAT, if this control signal K3BAT is as the control signal K3G of K switch 3, just can carry out Linear Control to charge and discharge switch K3, just can realize according to the voltage VBAT of battery charge node and sampling charging current ISEN node VBAT is carried out to precharge or constant current charge, with pre-charge current or constant current charge electric current, battery be charged.
Described full turn-on control circuit output control signal K3FON, if this control signal K3FON, as the control signal K3G of K switch 3, just can realize the full conducting of K switch 3.
The described output control signal K3OFF that switches off control circuit, if this control signal K3OFF is as the control signal K3G of K switch 3, just can realize the shutoff of K switch 3.
Discharge and recharge comparison module and comprise the first comparison circuit Comp1, the second comparison circuit Comp2, the 3rd comparison circuit Comp3 and the 4th comparison circuit Comp4.
The voltage of the normal phase input end input node VCHG of the first comparison circuit Comp1, the minimum operating voltage VSYS_MIN of inverting input input system, its output output control signal A.
The voltage of the normal phase input end input node VBAT of the second comparison circuit Comp2, the minimum operating voltage VSYS_MIN of its inverting input input system, its output output control signal B.
The normal phase input end of the 3rd comparison circuit Comp3 is inputted a reference current Iterm, and in one embodiment, this reference current Iterm is continuous current 1/10, its inverting input input charging current ISEN, its output output control signal D.
The voltage of the normal phase input end input node VBAT of the 4th comparison circuit Comp4, its inverting input is inputted a reference voltage, and this reference voltage is for being full of voltage VBAT_FULL, and its output is exported control signal E.
Second selector 2 selects a kind of control circuit that discharges and recharges control module to carry out control switch K3 according to signal A, the B, D, the E that discharge and recharge comparison module output, thereby realizes:
In the time that signal A is low level, no matter signal B, E, which kind of logic D is, and second selector selects the output K3FON signal of full turn-on control circuit to K3G, and the implementation that is PMOS for K3 is set to ground level by K3FON when full conducting.
When signal A is high level, and signal B is low level, no matter D, and which kind of logic E is, second selector all selects the output K3BAT of precharge/constant current charge control circuit to K3G.Precharge/constant current charge control circuit can adopt the precharge/constant current charge control circuit in linear-charging circuit of the prior art, and for simplified characterization, the present invention does not describe in detail to it.
When signal A is high level, and signal B is high level, and signal E is while being low level, and no matter signal D is any logic, and second selector will select the output K3FON of full turn-on control circuit to K3G.
When signal A is high level, and signal B is while being high level, and signal D and E be while being also high level, and second selector selects the output K3OFF switching off control circuit to K3G.Switch off control circuit and realize the function of stopcock K3.In the time that K3 is PMOS implementation, switches off control circuit ceiling voltage in transistorized PMOS source electrode or drain electrode, as output, can be turn-offed to PMOS transistor switch.
As signal A, B, E is high level, when signal D is low level, second selector selects the output K3FON of full turn-on control circuit to K3G.
Need to know, each signal A, B, E and the D that discharge and recharge in comparison module are identical with the physical meaning of each signal A, B, E and D in power supply comparison module, have no longer repeated here.In one embodiment, described charge-discharge control circuit 220 can be shared a comparison module with described power-supplying circuit 210, utilizes signal A, B, E and the D of this comparison module output to control selector separately.
Above-mentioned explanation has fully disclosed the specific embodiment of the present invention.It is pointed out that and be familiar with the scope that any change that person skilled in art does the specific embodiment of the present invention does not all depart from claims of the present invention.Correspondingly, the scope of claim of the present invention is also not limited only to described embodiment.
Claims (5)
1. a charge management circuit, is characterized in that, it comprises:
Power-supplying circuit;
Output circuit, its input connects external charge node, and output connects built-in system node, and it is the voltage of built-in system node by the voltage-regulation of external charge node according to the control of described power-supplying circuit;
Be connected in the charge and discharge switch between built-in system node and battery charge node; With
Charge-discharge control circuit, it is for described charge and discharge switch is controlled,
Described output circuit comprises the first switch, second switch, the first inductance and the first electric capacity,
The first switch and second switch are connected between external charge node and ground successively, the first inductance and the first electric capacity are connected between the intermediate node and ground between the first switch and second switch successively, the output that intermediate node between the first inductance and the first electric capacity is described output circuit
Described power-supplying circuit is controlled the first switch and second switch according to the voltage of built-in system node, the voltage of battery charge node and the charging current of battery, described charge-discharge control circuit is controlled charge and discharge switch according to the charging current of the voltage of battery charge node and battery
In the time that external charge node is not connected to adapter, the complete conducting of charge-discharge control circuit control charge and discharge switch, power-supplying circuit control the first switch and second switch turn-off,
When external charge node is connected to adapter, and when the voltage of battery charge node is less than the minimum operating voltage of system, described power-supplying circuit control the first switch and second switch make the voltage of built-in system node be maintained at the minimum operating voltage of system, described charge-discharge control circuit is according to the linear conducting of the charging current control charge and discharge switch of battery, battery is charged with constant charging current
When external charge node is connected to adapter, and the voltage of battery charge node is less than the minimum operating voltage of system, and while being also less than predetermined voltage threshold, described charge-discharge control circuit is according to the linear conducting of the charging current control charge and discharge switch of battery, battery is charged with pre-charge current
When external charge node is connected to adapter, and the voltage of battery charge node is less than the minimum operating voltage of system, and while being greater than predetermined voltage threshold, described charge-discharge control circuit, according to the linear conducting of the charging current control charge and discharge switch of battery, makes battery charge with the constant current charge electric current of being scheduled to.
2. charge management circuit according to claim 1, is characterized in that, when external charge node is connected to adapter, and the voltage of battery charge node be greater than the minimum operating voltage of system and be less than battery be full of voltage time,
Described power-supplying circuit is by controlling the first switch and second switch to control the voltage of built-in system node, and then to make built-in system node be still that battery charges by constant charging current, the full conducting of charge and discharge switch described in described charge-discharge control circuit control.
3. charge management circuit according to claim 2, it is characterized in that, when external charge node is connected to adapter, and the voltage of battery charge node rise to battery be full of voltage time, described power-supplying circuit makes the voltage constant of built-in system node be full of voltage in described battery by controlling the first switch and second switch, the full conducting of charge and discharge switch control charge and discharge switch and turn-off in the time that the charging current of battery is less than predetermined value described in described charge-discharge control circuit control.
4. charge management circuit according to claim 3, is characterized in that, described power-supplying circuit comprises power supply control module, first selector and power supply comparison module,
Described power supply comparator comprises the first comparator, the second comparator, the 3rd comparator and the 4th comparator, described power supply control module comprises the first constant voltage control circuit, constant current/constant voltage control circuit, the second constant voltage control circuit and switches off control circuit
The first comparator is voltage and the minimum operating voltage of system of external charge node relatively, and provide the first comparative result, the second comparator is voltage and the minimum operating voltage of system of battery charge node relatively, and provide the second comparative result, the 3rd comparator is the sampling charging current of pre-charge current value and battery relatively, and provides the 3rd comparative result, the voltage of the 4th comparator comparison battery charge node and battery be full of voltage, and provide the 4th comparative result
First selector selects the control signal of a control circuit output in described power supply control module to control the first switch and second switch according to each comparative result,
The first constant voltage control circuit is according to the Voltage-output control signal of built-in system node, the voltage constant of built-in system node is controlled to minimum operating voltage place,
Described constant current/constant voltage control circuit is according to the voltage of battery charge node and sampling charging current output control signal, charge take the constant current charge electric current controlling to be scheduled to as battery or the voltage constant of controlling battery charge node in battery be full of voltage place,
The second constant voltage control circuit is according to the Voltage-output control signal of built-in system node, is full of voltage place with what the voltage constant of built-in system node is controlled to battery,
The described output control signal that switches off control circuit, to control the shutoff of the first switch and second switch.
5. charge management circuit according to claim 3, is characterized in that, described charge-discharge control circuit comprises and discharge and recharge control module, second selector and discharge and recharge comparison module,
The described comparison module that discharges and recharges comprises the first comparator, the second comparator, the 3rd comparator and the 4th comparator, described in discharge and recharge control module and comprise precharge/constant current charge control circuit, full turn-on control circuit and switch off control circuit,
The first comparator is voltage and the minimum operating voltage of system of external charge node relatively, and provide the first comparative result, the second comparator is voltage and the minimum operating voltage of system of battery charge node relatively, and provide the second comparative result, the 3rd comparator is the sampling charging current of pre-charge current value and battery relatively, and provides the 3rd comparative result, the voltage of the 4th comparator comparison battery charge node and battery be full of voltage, and provide the 4th comparative result
Second selector is controlled charge and discharge switch according to the control signal that discharges and recharges a control circuit output in control module described in each comparative result selection,
Described precharge/constant current charge control circuit, according to the charging current output control signal of the voltage of battery charge node and sampling, carries out Linear Control to charge and discharge switch, so that battery is carried out to precharge or constant current charge,
Described full turn-on control circuit output control signal, to control the full conducting of charge and discharge switch,
The described output control signal that switches off control circuit, to control the shutoff of charge and discharge switch.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210137284.XA CN102664435B (en) | 2012-05-04 | 2012-05-04 | Charging management circuit |
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| CN201210137284.XA CN102664435B (en) | 2012-05-04 | 2012-05-04 | Charging management circuit |
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| CN102664435B true CN102664435B (en) | 2014-05-28 |
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| CN103199593B (en) * | 2013-04-26 | 2015-02-04 | 无锡中星微电子有限公司 | Charging management circuit and system |
| CN105703411A (en) * | 2014-11-26 | 2016-06-22 | 中兴通讯股份有限公司 | Control method, control device and electronic equipment |
| CN105871031B (en) * | 2016-05-24 | 2018-08-28 | 无锡中感微电子股份有限公司 | A kind of management of charging and discharging circuit and portable equipment |
| KR102346020B1 (en) * | 2017-04-17 | 2021-12-30 | 삼성전자주식회사 | Semiconductor device |
| CN107565645B (en) * | 2017-09-25 | 2022-05-24 | 珠海市杰理科技股份有限公司 | Battery charging management circuit |
| CN108365651A (en) * | 2018-03-13 | 2018-08-03 | 杰华特微电子（张家港）有限公司 | Battery charge-discharge circuit and charging/discharging thereof |
| CN109256831B (en) * | 2018-09-27 | 2020-12-01 | 吉林大学 | Charging device based on fuzzy control algorithm and charging control method |
| CN109624743A (en) * | 2019-01-18 | 2019-04-16 | 上海蔚来汽车有限公司 | Charging commutator and charging system |
| CN113949127B (en) * | 2021-10-19 | 2023-03-24 | 珠海智融科技股份有限公司 | Power supply management circuit for system power supply and control method |
| CN114448062B (en) * | 2022-04-11 | 2022-07-22 | 深圳市思远半导体有限公司 | Charging circuit, charging chip and charging control method of portable equipment |
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| US8450977B2 (en) * | 2007-12-20 | 2013-05-28 | O2Micro, Inc. | Power management systems with charge pumps |
| CN201590668U (en) * | 2009-10-22 | 2010-09-22 | 中兴通讯股份有限公司 | Charging device for mobile terminal |
| CN102118052B (en) * | 2011-03-03 | 2013-04-24 | 无锡中星微电子有限公司 | Power supply management system |
| CN202616820U (en) * | 2012-05-04 | 2012-12-19 | 无锡中星微电子有限公司 | Charging management circuit |
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Address after: 214028 10th Floor, Area A, 530 Building, Qingjia Road, Taihu International Science Park, Wuxi New District, Jiangsu Province Patentee after: Zgmicro Corporation Address before: 214028 10th Floor, Area A, 530 Building, Qingjia Road, Taihu International Science Park, Wuxi New District, Jiangsu Province Patentee before: WUXI VIMICRO Corp. |
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