CN202616820U - Charging management circuit - Google Patents
Charging management circuit Download PDFInfo
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- CN202616820U CN202616820U CN 201220199246 CN201220199246U CN202616820U CN 202616820 U CN202616820 U CN 202616820U CN 201220199246 CN201220199246 CN 201220199246 CN 201220199246 U CN201220199246 U CN 201220199246U CN 202616820 U CN202616820 U CN 202616820U
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Abstract
The utility model discloses a charging management circuit comprising a power supply control circuit, an output circuit, a charge and discharge switch connected between an internal system node and a battery charging node and a charge and discharge control circuit, wherein 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, and the output circuit adjusts the voltage of the external charging node into the voltage of the internal system node according to the control of the power supply control circuit. The charge and discharge control circuit is used for controlling the charge switch. Therefore, the application of a power switch is reduced to decrease the cost of the charging management circuit.
Description
[technical field]
The utility model relates to electronic circuit field, particularly a kind of charge management circuit.
[background technology]
Charge management circuit can be used to prolong the useful life and the fail safe that improves lithium battery of lithium battery usually.Charge management circuit comprises switching mode charge management circuit and linear model charge management circuit.Wherein, the switching mode charge management circuit is widely used in relating in the charging management chip of big electric current because of its high efficiency characteristic.
Please refer to shown in Figure 1ly, it is the circuit diagram of switching mode charge management circuit in the 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 the ground successively; Inductance L 1 and capacitor C 1 are connected between the intermediate node and ground between K switch 1 and the K switch 2 successively, and the intermediate node between inductance L 1 and the capacitor C 1 links to each other with battery charge node VBAT; The positive and negative electrode of battery BAT links to each other with ground with battery charge node VBAT respectively; K switch 3 and capacitor C 2 are connected between battery charge connected node VBAT and the ground successively, and wherein, the intermediate node between K switch 3 and the capacitor C 2 links to each other with built-in system supply node VSYS; K switch 4 is connected between node VCHG and the node VSYS; The input of charging control circuit 110 links to each other with node VBAT, and its two outputs link to each other with the control end of K switch 1 and the control end of K switch 2 respectively; Two outputs of power-supplying circuit 120 link to each other with the control end of K switch 3 and the control end of K switch 4 respectively.
The operation principle of this switching mode charge management circuit is following.
When node VCHG is connected to adapter (Adapter; Usually constitute by the AC-DC transducer) time; And if the voltage of battery BAT is when being in the underfill state; Charging control circuit 110 is through control switch K1 and 2 pairs of battery BAT chargings of K switch, and power-supplying circuit 120 is through control switch K4 conducting simultaneously, and K switch 3 is ended; Make node VCHG to node VSYS power supply, node VSYS is connected to voltage regulator (Regulator) usually or DC-to-dc converter (DC-DC converter) is the built-in system power supply.When the built-in system power consumption is big, preferentially satisfy system's power consumption, suitably reduce charging current to battery BAT.When built-in system power consumption during 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, this moment, K switch 4 and K switch 3 conductings simultaneously were system's power supply by node VCHG and battery BAT simultaneously.
When node VCHG was not connected to adapter, by power-supplying circuit 120 control switch K3 conductings, K4 broke off, and by battery BAT node VSYS is supplied power.
In the charge management circuit as shown in Figure 1, because K switch 1 ~ K4 is a power switch, require the conducting resistance of switch very little, therefore, no matter charging control circuit is to be integrated in the chip, still constitutes with the 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.
[utility model content]
The purpose of this part be to summarize the utility model embodiment some aspects and briefly introduce some preferred embodiments.In this part and the application's specification digest and denomination of invention, may do a little simplification or omit avoiding the making purpose of this part, specification digest and denomination of invention fuzzy, and this simplification or omit the scope that can not be used to limit the utility model.
The purpose of the utility model is to provide a kind of charge management circuit, under the prerequisite that realizes the Charge Management function, can reduce the use of power switch, and then reduce the cost of charge management circuit.
In order to reach the purpose of the utility model, the utility model provides a kind of charge management circuit, and it comprises: power-supplying circuit; Output circuit, its input connects external charge node, and output connects the built-in system node, and it is the voltage of built-in system node according to the control of said power-supplying circuit with the voltage-regulation of external charge node; Be connected in the charge and discharge switch between built-in system node and the battery charge node; And charge-discharge control circuit, it is used for said charge and discharge switch is controlled.
Further; Said output circuit comprises first switch, second switch, first inductance and first electric capacity; First switch and second switch are connected between external charge node and the ground successively; First inductance and first electric capacity are connected between the intermediate node and ground between first switch and the second switch successively, and the intermediate node between first inductance and first electric capacity is the output of said output circuit.
Further; Said power-supplying circuit is controlled 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 said charge-discharge control circuit is controlled charge and discharge switch according to the voltage of battery charge node and the charging current of battery.
Further again, when the external charge node is not connected to adapter, the complete conducting of charge-discharge control circuit control charge and discharge switch, power-supplying circuit controls first switch and second switch turn-offs.
Further again; When the external charge node is connected to adapter; And the voltage of battery charge node is during less than the minimum operating voltage of system; Said power-supplying circuit controls first switch and second switch makes the voltage of built-in system node be maintained at the minimum operating voltage of system, and said charge-discharge control circuit makes battery charge with constant charging current according to the linear conducting of charging current control charge and discharge switch of battery.
Further again; When the external charge node is connected to adapter; And the voltage of battery charge node greater than the minimum operating voltage of system less than battery be full of voltage the time; Said power-supplying circuit controlling the voltage of built-in system node, and then makes that the built-in system node is that battery charges through constant charging current still through control first switch and second switch, and said charge-discharge control circuit is controlled the full conducting of said charge and discharge switch.
Further again; When the external charge node is connected to adapter; And the voltage of battery charge node rise to battery be full of voltage the time; Said power-supplying circuit makes the voltage constant of built-in system node be full of voltage in said battery through controlling first switch and second switch, said charge-discharge control circuit control the full conducting of said charge and discharge switch and the charging current of battery during less than predetermined value the control charge and discharge switch turn-off.
Further again, when the external charge node is connected to adapter, and the voltage of battery charge node is less than the minimum operating voltage of system; And during also less than predetermined voltage threshold; Said charge-discharge control circuit makes battery charge to battery with pre-charge current, when the external charge node is connected to adapter according to the linear conducting of charging current control charge and discharge switch of battery; And the voltage of battery charge node is less than the minimum operating voltage of system; And during greater than predetermined voltage threshold, said charge-discharge control circuit makes battery charge to battery with predetermined constant current charge electric current according to the linear conducting of charging current control charge and discharge switch of battery.
Further again; Said power-supplying circuit comprises power supply control module, first selector and power supply comparison module; Said power supply comparator comprises first comparator, second comparator, the 3rd comparator and the 4th comparator; Said 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; First comparator is the minimum operating voltage of voltage and system of external charge node relatively, and provides first comparative result, and second comparator is the minimum operating voltage of voltage and system of battery charge node relatively; And provide 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 the said power supply control module to control first switch and second switch according to each comparative result, and the first constant voltage control circuit is controlled at minimum operating voltage place according to the voltage output control signal of built-in system node with the voltage constant with the built-in system node; Said constant current/constant voltage control circuit is according to the voltage and sampling charging current output control signal of battery charge node; With control with predetermined constant current charge electric current be battery charge or the voltage constant of control the battery charge node in battery be full of the voltage place, the second constant voltage control circuit is exported control signal according to the voltage of built-in system node, is full of the voltage place with what the voltage constant with the built-in system node was controlled at battery; The said output control signal that switches off control circuit is to control the shutoff of first switch and second switch.
Further again; Said charge-discharge control circuit comprises and discharges and recharges control module, second selector and discharge and recharge comparison module that the said comparison module that discharges and recharges comprises first comparator, second comparator, the 3rd comparator and the 4th comparator, and the said control module that discharges and recharges comprises precharge/constant current charge control circuit, full turn-on control circuit and switches off control circuit; First comparator is the minimum operating voltage of voltage and system of external charge node relatively; And providing first comparative result, second comparator is the minimum operating voltage of voltage and system of battery charge node relatively, and provides 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 selects the said control signal that discharges and recharges a control circuit output in the control module to control charge and discharge switch according to each comparative result; Said precharge/constant current charge control circuit carries out Linear Control to charge and discharge switch, so that battery is carried out precharge or constant current charge according to the voltage of battery charge node and the charging current output control signal of sampling; Said full turn-on control circuit output control signal; With the full conducting of control charge and discharge switch, the said output control signal that switches off control circuit is with the shutoff of control charge and discharge switch.
Compared with prior art; External charge node VCHG realizes the power supply to inner system node VSYS through the control of power-supplying circuit in the utility model; Said built-in system node VSYS realizes the control that discharges and recharges to battery charge node VBAT through the control of charge-discharge control circuit; Can reduce the use of power switch like this, thereby reduce the cost of charge management circuit.
[description of drawings]
In conjunction with reference to accompanying drawing and ensuing detailed description, the utility model will be more readily understood, the structure member that wherein same Reference numeral is corresponding same, wherein:
Fig. 1 is the electrical block diagram of existing charge management circuit;
Fig. 2 is the charge management circuit electrical block diagram in one embodiment in the utility model;
Fig. 3 is the power-supplying circuit electrical block diagram in one embodiment among Fig. 2; With
Fig. 4 is the charging control circuit electrical block diagram in one embodiment among Fig. 2.
[embodiment]
The detailed description of the utility model is mainly come the running of direct or indirect simulation the utility model technical scheme through program, step, logical block, process or other symbolistic descriptions.Be the thorough the utility model of understanding, in ensuing description, stated a lot of specific detail.And when not having these specific detail, the utility model then possibly still can be realized.Affiliated those of skill in the art use these descriptions here and state that the others skilled in the art in affiliated field effectively introduce their work essence.In other words, be the purpose of the utility model of avoiding confusion, owing to method, program, composition and the circuit known are readily appreciated that, so they are not described in detail.
Alleged here " embodiment " or " embodiment " are meant special characteristic, structure or the characteristic that can be contained at least one implementation of the utility model.Different in this manual local " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or optionally mutually exclusive with other embodiment embodiment.In addition, represent that the sequence of modules and revocable in method, flow chart or the functional block diagram of one or more embodiment refers to any particular order, also do not constitute restriction the utility model.
The emphasis and the bright spot of the charge management circuit that provides in the utility model are: first switch and second switch through control is connected between external charge node VCHG and the ground successively can directly be supplied power to inner system node VSYS; 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 through Linear Control the 3rd switch to battery charge node VBAT; Thereby reduced the number of power switch, and then reduced the cost of charge management circuit.
Please refer to shown in Figure 2ly, it shows charge management circuit 200 structural representation in one embodiment in the utility model.Said charge management circuit 200 comprises 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 the ground successively; Inductance L 1 and capacitor C 1 are connected between the intermediate node and ground between K switch 1 and the K switch 2 successively, and node links to each other with built-in system node VSYS between inductance L 1 and the capacitor C 1; K switch 3 and capacitor C 2 are connected between node VSYS and the ground successively, and the node that K switch 3 is connected with capacitor C 2 links to each other with battery charge node VBAT, and the both positive and negative polarity of battery BAT links to each other with ground with node VBAT respectively.
Power-supplying circuit 210 carries out the control to switch K1 and K switch 2 through the voltage of detection node VSYS, the voltage of node VBAT and the charging current ISEN (the actual samples charging current of battery) of battery BAT, thereby can realize the power supply to node VSYS.Charge-discharge control circuit 220 carries out the Linear Control to switch K3 through 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 concrete operation principle of said charge management circuit is following.
When node VCHG was not connected to adapter, by the complete conducting of charge-discharge control circuit 220 control switch K3, battery BAT was to node VSYS discharge, for built-in system provides power supply.Power-switching circuit in the built-in system serves as the input power supply with the voltage of node VSYS; For built-in system produces various needed voltages; Such as 3.3V, 2.8V, 1.8V or 1.2V, the power-switching circuit that is connected node VSYS can comprise one or more voltage regulator and DC-to-dc converter.At this moment, turn-off by said power-supplying circuit 210 control switch K1 and K2.
VCHG is connected to adapter when node; And when cell voltage VBAT was lower than minimum operating voltage VSYS_MIN, said power-supplying circuit 210 was through voltage cut-out K1 and the K switch 2 of detected node VSYS, thereby the voltage of node VSYS is adjusted into the required minimum operating voltage VSYS_MIN of system; 3.5V for example; For the voltage regulator of 3.3V output, 3.5V is than the high 0.2V of 3.3V, and the minimum differntial pressure that satisfies voltage regulator requires to get final product; Realized that like this cell voltage VBAT crosses when hanging down, to the requirement of system's power supply.
VCHG is connected to adapter when node; And when cell voltage VBAT is lower than minimum operating voltage VSYS_MIN; Also be lower than the pre-charge voltage threshold value (to the lithium battery of routine; Be generally 3.0V) time; Charge-discharge control circuit 220 is according to detected cell voltage VBAT and the linear conducting of charging current ISEN control switch K3, and this moment, the conducting resistance of said K switch 3 changed, and with less pre-charge current Iterm (a predefined current value) battery BAT was carried out constant current charge; Be that charge-discharge control circuit 220 is operated in the 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.
VCHG is connected to adapter when node; And be lower than minimum operating voltage VSYS_MIN as cell voltage VBAT, and when being higher than said pre-charge voltage threshold value, charge-discharge control circuit 220 switches to constant current charging mode battery BAT is carried out constant current charge; Charge to battery BAT with predetermined constant current charge electric current this moment; VBAT constantly rises along with cell voltage, and for enough big constant current charge electric current is provided, 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 littler.
VCHG is connected to adapter when node; And when cell voltage VBAT is higher than minimum operating voltage VSYS_MIN and is lower than when being full of voltage VBAT_FULL; The said K switch 3 of said charging control circuit 220 controls is in complete conducting state, and (K switch 3 can be the PMOS transistor in the actual design; The Rule of judgment of its complete conducting state can be the about 50mv of its grid voltage decline); Said power-supplying circuit 210 is by VSYS_MIN constant voltage state; Changing into the voltage of detection node VBAT and the electric current of electric current on the K switch 3 (charging current of promptly sampling ISEN) or K switch 1 serves as according to switch K1 and K switch 2 being controlled, allow node VSYS voltage to rise with the rising of cell voltage VBAT at this moment, can being higher than 3.5V; Be that said power-supplying circuit 210 is operated in the constant current operating state, thereby continue to realize battery BAT is carried out constant current charge.
VCHG is connected to adapter when node; And cell voltage VBAT rises to and (for example is full of voltage VBAT_FULL; Lithium battery is generally 4.2V) time, said charging control circuit 220 control switch K3 continue to keep complete conducting, and power-supplying circuit 210 is through voltage cut-out K1 and the K switch 2 of detected node VSYS; The voltage of keeping node VBAT is in and is full of voltage VBAT_FULL, and promptly power-supplying circuit 210 is operated in constant voltage mode.BAT is full of gradually along with battery, and charging current ISEN reduces gradually, and when charging current ISEN was reduced to pre-charge current Iterm, promptly 1/10 of the constant current charge electric current o'clock, charging finished.When charging finishes, can be designed to different schemes according to the different demands of system: the voltage that a kind of design, design continue to keep node VBAT is 4.2V; Another kind of design can be designed to charging and accomplish; By charge-discharge control circuit 220 control stopcock K3; Come control switch K1 and K switch 2 by power-supplying circuit 210 according to the voltage of the node VSYS that collects; Thereby the voltage of keeping node VSYS is VBAT_FULL (4.2V), also can keep node VSYS in other magnitudes of voltage, for example 4.4V or VSYS_MIN etc. according to other considerations.
K switch 1 among 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 links to each other with said power-supplying circuit 210, this output circuit under the control of power-supplying circuit 210 with the input voltage regulation of node VCHG output voltage for the node VSYS that needs.In other embodiments, also can adopt the output circuit of other form, as long as can realize voltage-regulation to node VSYS.
In sum; In the utility model; Control through 210 couples of switch K1 of power-supplying circuit and K2 realizes node VCHG to node VSYS power supply, and the control through 220 couples of switch K3 of charge-discharge control circuit realizes discharging and recharging between node VSYS and the node VBAT.With respect to prior art, reduced the quantity of power switch, thereby can reduce cost.
Please refer to shown in Figure 3ly, it is power-supplying circuit 210 electrical block diagram in one embodiment among Fig. 2.
Said power-supplying circuit comprises power supply control module, first selector and power supply comparison module.Said 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.
The said 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 the 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.
Said constant current/constant voltage control circuit is according to the voltage and sampling charging current ISEN output control signal K1BAT and K2BAT of node VBAT; If this control signal K1BAT and K2BAT be respectively as the control signal K1G and the K2G of K switch 1 and K switch 2, be that battery charges or is full of voltage VBAT_FULL place with what the voltage constant of node VBAT was controlled in battery with the constant current charge electric current of being scheduled to regard to may command.
The said 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 the 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.
Said switch off control circuit output control signal K1OFF and K2OFF are if this control signal K1OFF and K2OFF just can realize the shutoff to switch K1 and K switch 2 respectively as the control signal K1G and the K2G of K switch 1 and K switch 2.
Said 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, the 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 a 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 are that battery is full of voltage VBAT_FULL, its output output signal E.
The signal of a kind of control circuit output of the signal A that first selector is exported according to the power supply comparison module, B, D, E selection power supply control module is as the control signal of control switch K1 and K2.
The concrete course of work of said power-supplying circuit is following.
When signal A is low level (expression node VCHG be not connected to adapter), signal B no matter, which kind of logic D, 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 (expression node VCHG has been connected to adapter); And signal B is low level (expression cell voltage VBAT is lower than minimum operating voltage VSYS_MIN); D no matter; 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 (expression node VCHG has been connected to adapter); And signal B is high level (expression cell voltage VBAT is higher than minimum operating voltage VSYS_MIN); And when signal E is low level (expression cell voltage VBAT be lower than be 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, and K2BAT is to K1G and K2G, and this moment, the constant current/constant voltage control circuit carried out constant current charge with predetermined constant current charge electric current to battery to battery.
When signal A is a high level; And signal B is a high level; And signal E is high level (expression cell voltage VBAT be higher than be full of voltage VBAT_FULL); When signal D also was high level (expression charging current less than pre-charge current), first selector selected output K1FUL and the K2FUL of the second constant voltage control circuit to K1G and K2G.
As signal A; B; E is a high level, and when signal D was low level (the expression charging current is greater than pre-charge current), first selector was selected the output K1BAT of constant current/constant voltage control circuit; K2BAT is to K1G and K2G, and this moment, said constant current/constant voltage control circuit was full of voltage VBAT_FULL place with what the voltage constant of said node VBAT was controlled at battery.
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 to get final product, and in order to simplify description, the utility model does not describe in detail to it; The constant current/constant voltage Control current can adopt that the constant current/constant voltage control circuit in the switching mode charge controller gets final product in the prior art, and in order to simplify description, the utility model does not describe in detail to it.
Please refer to shown in Figure 4ly, it is the charge-discharge control circuit structural representation in one embodiment among Fig. 2.
Said charge-discharge control circuit comprises and discharges and recharges control module, second selector and discharge and recharge comparison module.The said control module that discharges and recharges is used to export control signal, and it comprises precharge/constant current charge control circuit, full turn-on control circuit with switch off control circuit.
Said precharge/constant current charge control circuit is according to voltage and the charging current ISEN output control signal K3BAT of node VBAT; 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 with sampling charging current ISEN node VBAT being carried out precharge or constant current charge, promptly battery charged with pre-charge current or constant current charge electric current according to the voltage VBAT of battery charge node.
Said full turn-on control circuit output control signal K3FON is if this control signal K3FON just can realize the full conducting of K switch 3 as the control signal K3G of K switch 3.
The said output control signal K3OFF that switches off control circuit is if this control signal K3OFF just can realize the shutoff of K switch 3 as the control signal K3G 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 imported a reference current Iterm, and in one embodiment, this reference current Iterm is 1/10 of a continuous current, 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 imported a reference voltage, and this reference voltage is for being full of voltage VBAT_FULL, its output output control signal E.
Second selector 2 comes control switch K3 according to a kind of control circuit that the signal A that discharges and recharges comparison module output, B, D, E select to discharge and recharge control module, thereby realizes:
When signal A is low level, signal B no matter, which kind of logic E, D are, second selector selects the output K3FON signal of full turn-on control circuit to K3G, is the implementation of PMOS for K3, is about to K3FON during full conducting and is changed to ground level.
When signal A is a high level, and signal B is low level, D no matter, 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 the linear-charging circuit of the prior art to get final product, and in order to simplify description, the utility model does not describe in detail to it.
When signal A is a high level, and signal B is high level, and signal E is when 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 a high level, and signal B is when being high level, and signal D and E be when also being high level, and the output K3OFF that second selector is selected to switch off control circuit is to K3G.Switch off control circuit and promptly realize the function of stopcock K3.When K3 is the PMOS implementation, switches off control circuit ceiling voltage in transistorized source electrode of PMOS or the drain electrode promptly can be turn-offed the PMOS transistor switch as output.
As signal A, B, E are high level, and when signal D was low level, second selector selected the output K3FON of full turn-on control circuit to K3G.
What need know is, the physical meaning that discharges and recharges each signal A, B, E and D in each signal A, B, E and D and the power supply comparison module in the comparison module all is identical, has no longer repeated here.In one embodiment, said charge-discharge control circuit 220 can be shared a comparison module with said 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 embodiment of the utility model.It is pointed out that any change that the technical staff that is familiar with this field does the embodiment of the utility model does not all break away from the scope of claims of the utility model.Correspondingly, the scope of the claim of the utility model also is not limited only to said embodiment.
Claims (10)
1. charge management circuit is characterized in that it comprises:
Power-supplying circuit;
Output circuit, its input connects external charge node, and output connects the built-in system node, and it is the voltage of built-in system node according to the control of said power-supplying circuit with the voltage-regulation of external charge node;
Be connected in the charge and discharge switch between built-in system node and the battery charge node; With
Charge-discharge control circuit, it is used for said charge and discharge switch is controlled.
2. charge management circuit according to claim 1 is characterized in that, said output circuit comprises first switch, second switch, first inductance and first electric capacity,
First switch and second switch are connected between external charge node and the ground successively; First inductance and first electric capacity are connected between the intermediate node and ground between first switch and the second switch successively, and the intermediate node between first inductance and first electric capacity is the output of said output circuit.
3. charge management circuit according to claim 2; It is characterized in that; Said power-supplying circuit is controlled 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 said charge-discharge control circuit is controlled charge and discharge switch according to the voltage of battery charge node and the charging current of battery.
4. charge management circuit according to claim 3 is characterized in that, when the external charge node is not connected to adapter, and the complete conducting of charge-discharge control circuit control charge and discharge switch, power-supplying circuit controls first switch and second switch turn-offs.
5. charge management circuit according to claim 4 is characterized in that,
When the external charge node is connected to adapter; And the voltage of battery charge node is during less than the minimum operating voltage of system; Said power-supplying circuit controls first switch and second switch makes the voltage of built-in system node be maintained at the minimum operating voltage of system; Said charge-discharge control circuit makes battery charge with constant charging current according to the linear conducting of charging current control charge and discharge switch of battery.
6. charge management circuit according to claim 5 is characterized in that, when the external charge node is connected to adapter, and the voltage of battery charge node greater than the minimum operating voltage of system less than battery be full of voltage the time,
Said power-supplying circuit is through controlling first switch and the second switch voltage with control built-in system node; And then making that the built-in system node is that battery charges through constant charging current still, said charge-discharge control circuit is controlled the full conducting of said charge and discharge switch.
7. charge management circuit according to claim 6; It is characterized in that; When the external charge node is connected to adapter; And the voltage of battery charge node rise to battery be full of voltage the time, said power-supplying circuit makes the voltage constant of built-in system node be full of voltage in said battery through controlling first switch and second switch, said charge-discharge control circuit control the full conducting of said charge and discharge switch and the charging current of battery during less than predetermined value the control charge and discharge switch turn-off.
8. charge management circuit according to claim 5 is characterized in that,
When the external charge node is connected to adapter; And the voltage of battery charge node is less than the minimum operating voltage of system; And during also less than predetermined voltage threshold; Said charge-discharge control circuit makes battery charge to battery with pre-charge current according to the linear conducting of charging current control charge and discharge switch of battery
When the external charge node is connected to adapter; And the voltage of battery charge node is less than the minimum operating voltage of system; And during greater than predetermined voltage threshold; Said charge-discharge control circuit makes battery charge to battery with predetermined constant current charge electric current according to the linear conducting of charging current control charge and discharge switch of battery.
9. charge management circuit according to claim 7 is characterized in that, said power-supplying circuit comprises power supply control module, first selector and power supply comparison module,
Said power supply comparator comprises first comparator, second comparator, the 3rd comparator and the 4th comparator; Said 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
First comparator is the minimum operating voltage of voltage and system of external charge node relatively, and provides first comparative result, and second comparator is the minimum operating voltage of voltage and system of battery charge node relatively; And provide 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 the said power supply control module to control first switch and second switch according to each comparative result,
The first constant voltage control circuit is controlled at minimum operating voltage place according to the voltage output control signal of built-in system node with the voltage constant with the built-in system node,
Said constant current/constant voltage control circuit is according to the voltage of battery charge node and sampling charging current output control signal, with control with predetermined constant current charge electric current be battery charge or the voltage constant of controlling the battery charge node in battery be full of the voltage place,
The second constant voltage control circuit is according to the voltage of built-in system node output control signal, is full of the voltage place with what the voltage constant with the built-in system node was controlled at battery,
The said output control signal that switches off control circuit is to control the shutoff of first switch and second switch.
10. charge management circuit according to claim 7 is characterized in that, said charge-discharge control circuit comprises and discharge and recharge control module, second selector and discharge and recharge comparison module,
The said comparison module that discharges and recharges comprises first comparator, second comparator, the 3rd comparator and the 4th comparator, and the said control module that discharges and recharges comprises precharge/constant current charge control circuit, full turn-on control circuit and switch off control circuit,
First comparator is the minimum operating voltage of voltage and system of external charge node relatively, and provides first comparative result, and second comparator is the minimum operating voltage of voltage and system of battery charge node relatively; And provide 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 selects the said control signal that discharges and recharges a control circuit output in the control module to control charge and discharge switch according to each comparative result,
Said precharge/constant current charge control circuit carries out Linear Control according to the charging current output control signal of the voltage of battery charge node and sampling to charge and discharge switch, so that battery is carried out precharge or constant current charge,
Said full turn-on control circuit output control signal, with the full conducting of control charge and discharge switch,
The said output control signal that switches off control circuit is with the shutoff of control charge and discharge switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220199246 CN202616820U (en) | 2012-05-04 | 2012-05-04 | Charging management circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220199246 CN202616820U (en) | 2012-05-04 | 2012-05-04 | Charging management circuit |
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| Publication Number | Publication Date |
|---|---|
| CN202616820U true CN202616820U (en) | 2012-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220199246 Withdrawn - After Issue CN202616820U (en) | 2012-05-04 | 2012-05-04 | Charging management circuit |
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| CN (1) | CN202616820U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664435A (en) * | 2012-05-04 | 2012-09-12 | 无锡中星微电子有限公司 | Charging management circuit |
| CN109586363A (en) * | 2018-11-15 | 2019-04-05 | 上海移远通信技术股份有限公司 | A kind of charging circuit |
-
2012
- 2012-05-04 CN CN 201220199246 patent/CN202616820U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664435A (en) * | 2012-05-04 | 2012-09-12 | 无锡中星微电子有限公司 | Charging management circuit |
| CN109586363A (en) * | 2018-11-15 | 2019-04-05 | 上海移远通信技术股份有限公司 | A kind of charging circuit |
| CN109586363B (en) * | 2018-11-15 | 2022-06-07 | 上海移远通信技术股份有限公司 | Charging circuit |
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Granted publication date: 20121219 Effective date of abandoning: 20140528 |
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| RGAV | Abandon patent right to avoid regrant |