CN104348195B - Realize extending out the constant-current constant-voltage charging circuit structure of function - Google Patents
Realize extending out the constant-current constant-voltage charging circuit structure of function Download PDFInfo
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- CN104348195B CN104348195B CN201310322175.XA CN201310322175A CN104348195B CN 104348195 B CN104348195 B CN 104348195B CN 201310322175 A CN201310322175 A CN 201310322175A CN 104348195 B CN104348195 B CN 104348195B
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- 238000010281 constant-current constant-voltage charging Methods 0.000 title claims abstract description 31
- 238000005070 sampling Methods 0.000 claims abstract description 90
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- 230000003321 amplification Effects 0.000 claims abstract description 13
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 13
- 238000007600 charging Methods 0.000 claims description 83
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- 238000005516 engineering process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0069—Charging or discharging for charge maintenance, battery initiation or rejuvenation
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- H02J7/0072—
Abstract
The present invention relates to a kind of constant-current constant-voltage charging circuit structure realizing extending out function, module is controlled including constant current constant voltage, output sampling drives module, output sampling feedback module, external signal amplification module, extend out enable judge module, charge saturated judge module and time delay module, described external signal amplification module is connected to described output sampling and drives between module and battery to be charged, the described first input end enabling judge module that extends out is connected with the sample rate current feedback output end of described output sampling feedback module, the described outfan extending out the second input and the described saturated judge module that charges enabling judge module is connected. the realization adopting this kind of structure extends out the constant-current constant-voltage charging circuit structure of function, can realize extending out function on the basis realize constant-current constant-voltage charging simultaneously, circuit structure is stable, it is used conveniently and safely, constant-current constant-voltage charging can be carried out for the battery of more capacity, there is wider application scope.
Description
Technical field
The present invention relates to charging field, particularly relate to constant-current constant-voltage charging field, specifically refer to a kind of constant-current constant-voltage charging circuit structure realizing extending out function.
Background technology
It is known that lithium cell charging generally all to be adopted the mode of constant current constant voltage, it is achieved method is the intelligence sample to output to battery and feeds back to control circuit to realize the charging process of constant current constant voltage. Output pipe is generally integrated in inside by this implementation, in order to gather charge information; To in battery charging process, circuit self bears certain power consumption, and due to the restriction of circuit package heat radiation, the output electric current that it can be provided by is limited; During currently set at mobile phone and some other intelligence, portable power source etc. is applied, the capacity using battery is increasing, accordingly charging current ability also being improved, in order to meet this demand, some designs on original charging scheme by extending out the ability improving charging current.
It is illustrated in figure 1 in prior art and realizes extending out the charging circuit configuration of function. Saturated control module of charging judges whether to be full of also output termination charging signals or startup charging signals. Charge control module, output driving and signal acquisition module also realize controlled charging process in conjunction with feedback signal, and this is the basic structure that a lithium cell charging controls. And the charging that extends out realized on this basis is through the external PNP pipe shown in figure, utilizing the built-in switch SW drop-down electric current of base stage to external PNP pipe of circuit, this electric current amplifies through external PNP pipe and is transported to rechargeable battery. Because it is uncontrollable to flow through switch SW electric current, it is therefore necessary to an external current-limiting resistance Rpb, it is prevented that external PNP pipe produces excessive charging current and damages.
For saturated judgement of charging, generally being utilized in constant voltage to fill the stage, charging current is down to certain ratio when constant current is filled, it is clear that in such scheme, this judgment mode cannot be realized, because the electric current of external PNP pipe exists all the time and can not change and also cannot gather current information during charging. In order to solve this problem, in the way of being periodically detected, generally judge whether cell voltage reaches to stop supplementing with money, namely increase clock in inside, under the control of clock, first stop charging, then judge that whether cell voltage is saturated, if unsaturation, recharge, go round and begin again, until saturated. In this manner, actual constant current constant voltage is nonsensical. As it was previously stated, this application designs for big charging current, during charging, battery all can embody certain internal resistance, battery difference internal resistance is different, if cell resistance is bigger than normal, then under this charging modes, cell voltage is likely to rise to the degree of danger close, thus accidents caused.
Example: cell voltage 4.0V is saturated for 4.2V, charging current 2A, the internal resistance of cell 0.2 ohm.
When so charging, the voltage at battery two ends is up to: 4+2 × 0.2=4.4V, considerably beyond 4.2V nominal voltage.
Therefore the existing charging modes extending out formula cannot really realize the charging process of constant current constant voltage, and there is hidden danger.
Summary of the invention
It is an object of the invention to the shortcoming overcoming above-mentioned prior art, it is provided that a kind of can the realization on the basis of constant-current constant-voltage charging extend out function, simple in construction, stable, safe and convenient to use, there is the realization of broader applications scope extend out the constant-current constant-voltage charging circuit structure of function.
To achieve these goals, the realization of the present invention extends out the constant-current constant-voltage charging circuit structure of function and has following composition:
This realization extends out the constant-current constant-voltage charging circuit structure of function, and it is mainly characterized by, and described charging circuit configuration includes:
Constant current constant voltage controls module;
Output sampling drives module, and this output sampling drives the outfan that the first input end of module controls module with described constant current constant voltage to be connected;
Output sampling feedback module, the input of this output sampling feedback module drives the outfan of module to be connected with described output sampling, the first input end that the sample rate current feedback output end of this output sampling feedback module controls module with described constant current constant voltage is connected, the second input that the sampled voltage feedback output end of this output sampling feedback module controls module with described constant current constant voltage is connected, and total outfan of this output sampling feedback module is connected with battery to be charged;
External signal amplification module, is connected to described output sampling and drives between module and battery to be charged;
Time delay module, the 3rd input that the outfan of this time delay module controls module with described constant current constant voltage is connected;
Charge saturated judge module, and the input of the saturated judge module of this charging is connected with the sample rate current feedback output end of described output sampling feedback module, and the outfan of the saturated judge module of this charging is connected with described time delay module;
Extend out enable judge module, this extends out the first input end enabling judge module and is connected with the sample rate current feedback output end of described output sampling feedback module, this outfan extending out the second input and the described saturated judge module that charges enabling judge module is connected, and this extends out the outfan enabling judge module and drives the second input of module to be connected with described output sampling.
Preferably, described external signal amplification module includes an external PNP pipe and a current-limiting resistance, described current-limiting resistance is connected between outfan and the base stage of described external PNP pipe that described output sampling drives module, and the colelctor electrode of described external PNP pipe is connected with described battery to be charged.
Preferably, the saturated judge module of described charging includes at least one comparator, inverting input and first reference power source of the comparator of the described saturated judge module that charges are connected, the normal phase input end of comparator of the described saturated judge module that charges is connected with the sample rate current feedback output end of described output sampling feedback module, and the outfan of the comparator of the described saturated judge module that charges is connected with the input of described time delay module, described the second input enabling judge module that extends out respectively.
Preferably, the described enable judge module that extends out includes a comparator and a rest-set flip-flop, the described normal phase input end extending out the comparator enabling judge module and the second reference power source are connected, the S end of described rest-set flip-flop is connected with the described outfan extending out the comparator enabling judge module, the R end of described rest-set flip-flop is connected with the outfan of the described saturated judge module that charges, and the Q end of described rest-set flip-flop drives the second input of module to be connected with described output sampling.
Preferably, described constant current constant voltage controls module and includes a charging operational amplifier, inverting input and the 3rd reference power source of described charging operational amplifier are connected, first normal phase input end of described charging operational amplifier is connected with the sample rate current feedback output end of described output sampling feedback module, second normal phase input end of described charging operational amplifier is connected with the sampled voltage feedback output end of described output sampling feedback module, and the 3rd input of described charging operational amplifier is connected with the outfan of described time delay module.
Preferably, described output sampling feedback module includes the first PMOS, second PMOS, 4th PMOS, follow operational amplifier, sampling resistor, first feedback resistance and the second feedback resistance, described output sampling drives module by the second described PMOS, first PMOS is connected with described battery to be charged, the second described PMOS is connected with the 4th PMOS, one end that described sampling resistor is connected with the 4th described PMOS is as the sample rate current feedback output end of described output sampling feedback module, the other end of this sampling resistor is connected with described battery to be charged, the described outfan following operational amplifier is connected with the 4th described PMOS, the described inverting input following operational amplifier and the second PMOS are connected, the described normal phase input end following operational amplifier and the first PMOS are connected, first described feedback resistance one end is connected with the first described PMOS and battery to be charged respectively, the other end of this first feedback resistance is connected with the second described feedback resistance, second described feedback resistance one end respectively with the first described feedback resistance, described constant current constant voltage controls the second input of module and is connected, the other end of this second feedback resistance is connected with described battery to be charged.
More preferably, described output sampling drives module to include the first NMOS tube, second NMOS tube, 3rd NMOS tube, 3rd PMOS and the 5th PMOS, the first described NMOS tube is all connected with the 5th PMOS with the second NMOS tube, the 5th described PMOS is connected with the 4th described PMOS common gate, the 3rd described PMOS is connected with the second PMOS common gate, the outfan that the grid of the 3rd described PMOS controls module with described constant current constant voltage is connected, the 3rd described NMOS tube is connected with the second described NMOS tube, the grid of the 3rd described NMOS tube is connected with the described outfan enabling judge module that extends out, the 3rd described NMOS tube is connected with the input of described external signal amplification module.
Preferably, described time delay module includes a constant-current source, the 6th PMOS, the 4th NMOS tube, an electric capacity and a phase inverter, the 6th described PMOS and the grid of the 4th NMOS tube are all connected to the outfan of the described saturated judge module that charges, the 6th described PMOS is connected with constant-current source, and the 3rd input that the 4th described NMOS tube controls module by described electric capacity, phase inverter with described constant current constant voltage is connected.
Have employed the realization in this invention and extend out the constant-current constant-voltage charging circuit structure of function, have the advantages that
1, provide a kind of constant-current constant-voltage charging circuit structure having and extending out function, extend out in realization and the basis of charge function also achieves constant current constant voltage control, make its saturation detection value do not extended out pass effect by secondary detection technology.
2, circuit structure is simple, easy to use, it is adaptable to the constant-current constant-voltage charging of the various batteries that can be recycled, and has wider application scope.
Accompanying drawing explanation
Fig. 1 is the structural representation realizing extending out the charging circuit configuration of function in prior art.
Fig. 2 is the comprising modules block diagram that the realization of the present invention extends out the constant-current constant-voltage charging circuit structure of function.
Fig. 3 is the structural representation that the realization of the present invention extends out the constant-current constant-voltage charging circuit structure of function.
Fig. 4 is the detailed construction schematic diagram that the realization of the present invention extends out the constant-current constant-voltage charging circuit structure of function.
Detailed description of the invention
In order to more clearly describe the technology contents of the present invention, conduct further description below in conjunction with specific embodiment.
The realization being illustrated in figure 2 the present invention extends out the constant-current constant-voltage charging circuit structure of function.
Constant current constant voltage controls module 4;
Output sampling drives module 5, and this output sampling drives the outfan that the first input end of module 5 controls module 4 with described constant current constant voltage to be connected;
Output sampling feedback module 6, the input 6 of this output sampling feedback module drives the outfan of module 5 to be connected with described output sampling, the first input end that the sample rate current feedback output end of this output sampling feedback module 6 controls module 4 with described constant current constant voltage is connected, the second input that the sampled voltage feedback output end of this output sampling feedback module 6 controls module 4 with described constant current constant voltage is connected, and total outfan of this output sampling feedback module 6 is connected with battery 7 to be charged;
External signal amplification module 8, is connected to described output sampling and drives between module 5 and battery to be charged 7;
Time delay module 3, the 3rd input that the outfan of this time delay module 3 controls module 4 with described constant current constant voltage is connected;
Charge saturated judge module 2, and the input of the saturated judge module of this charging 2 is connected with the sample rate current feedback output end of described output sampling feedback module 6, and the outfan of the saturated judge module of this charging 2 is connected with described time delay module 3;
Extend out enable judge module, this extends out the first input end enabling judge module 1 and is connected with the sample rate current feedback output end of described output sampling feedback module 6, this outfan extending out the second input and the described saturated judge module 2 that charges enabling judge module 1 is connected, and this extends out the outfan enabling judge module 1 and drives the second input of module 5 to be connected with described output sampling.
It is illustrated in figure 3 the structural representation that the realization of the present invention extends out the constant-current constant-voltage charging circuit structure of function.
Described external signal amplification module 8 includes an external PNP pipe and a current-limiting resistance, described current-limiting resistance is connected between outfan and the base stage of described external PNP pipe that described output sampling drives module 5, and the colelctor electrode of described external PNP pipe is connected with described battery to be charged 7.
It is illustrated in figure 4 the detailed construction schematic diagram that the realization of the present invention extends out the constant-current constant-voltage charging circuit structure of function.
1 is extend out enable judge module, and inside comprises a comparator and rest-set flip-flop.
The described normal phase input end extending out the comparator enabling judge module and the second reference power source are connected, the S end of described rest-set flip-flop is connected with the described outfan extending out the comparator enabling judge module, the R end of described rest-set flip-flop is connected with the outfan of the described saturated judge module 2 that charges, and the Q end of described rest-set flip-flop drives the second input of module 5 to be connected with described output sampling.
2 is the saturated judge module that charges, internal including at least a comparator.
In the present embodiment, the saturated judge module 2 of described charging includes a comparator. Inverting input and first reference power source of the comparator of the described saturated judge module that charges are connected, the normal phase input end of comparator of the described saturated judge module that charges is connected with the sample rate current feedback output end of described output sampling feedback module 6, and the outfan of the comparator of the described saturated judge module that charges is connected with the input of described time delay module 3, described the second input enabling judge module 1 that extends out respectively.
3 is delay circuit, and signal is had time-lag action, including a constant-current source, PMOS, NMOS, electric capacity and phase inverter.
In the present embodiment, described time delay module includes a constant-current source, the 6th PMOS, the 4th NMOS tube, an electric capacity and a phase inverter, the 6th described PMOS and the grid of the 4th NMOS tube are all connected to the outfan of the described saturated judge module 2 that charges, the 6th described PMOS is connected with constant-current source, and the 3rd input that the 4th described NMOS tube controls module 4 by described electric capacity, phase inverter with described constant current constant voltage is connected.
When inputting signal and having low level to become high level, its time delay can be ignored.
When inputting signal and having high level to become low level, the delay time of its generation can be estimated according to equation below:
Tdly=(Cdly × Vth)/Idly;
Wherein, Vth is the threshold voltage of described phase inverter, and Cdly is the capacitance of described electric capacity, and Idly is the current value flowing through described chronotron.
4 is that constant current constant voltage controls module, and the output electric current of detection output sampling feedback module 6 and output voltage are so as to charge according to the process of constant current constant voltage.
Described constant current constant voltage controls module 4 and includes a charging operational amplifier, inverting input and the 3rd reference power source of described charging operational amplifier are connected, first normal phase input end of described charging operational amplifier is connected with the sample rate current feedback output end of described output sampling feedback module 6, second normal phase input end of described charging operational amplifier is connected with the sampled voltage feedback output end of described output sampling feedback module 6, and the 3rd input of described charging operational amplifier is connected with the outfan of described time delay module 3.
6 is output sampling feedback module, and the current signal of sampling and the voltage signal of sampling are also fed back to constant-current and constant-voltage control circuit by output charging current.
Described output sampling feedback module 6 includes the first PMOS, second PMOS, 4th PMOS, follow operational amplifier, sampling resistor, first feedback resistance and the second feedback resistance, described output sampling drives module 5 by the second described PMOS, first PMOS is connected with described battery to be charged 7, the second described PMOS is connected with the 4th PMOS, one end that described sampling resistor is connected with the 4th described PMOS is as the sample rate current feedback output end of described output sampling feedback module 6, the other end of this sampling resistor is connected with described battery to be charged 7, the described outfan following operational amplifier is connected with the 4th described PMOS, the described inverting input following operational amplifier and the second PMOS are connected, the described normal phase input end following operational amplifier and the first PMOS are connected, first described feedback resistance one end is connected with the first described PMOS and battery to be charged 7 respectively, the other end of this first feedback resistance is connected with the second described feedback resistance, second described feedback resistance one end respectively with the first described feedback resistance, described constant current constant voltage controls the second input of module 4 and is connected, the other end of this second feedback resistance is connected with described battery to be charged 7.
5 be output sampling drive module, sample one with the electric current of constant current output current in proportion to drive external PNP pipe.
Described output sampling drives module 5 to include the first NMOS tube, second NMOS tube, 3rd NMOS tube, 3rd PMOS and the 5th PMOS, the first described NMOS tube is all connected with the 5th PMOS with the second NMOS tube, the 5th described PMOS is connected with the 4th described PMOS common gate, the 3rd described PMOS is connected with the second PMOS common gate, the outfan that the grid of the 3rd described PMOS controls module 4 with described constant current constant voltage is connected, the 3rd described NMOS tube is connected with the second described NMOS tube, the grid of the 3rd described NMOS tube is connected with the described outfan enabling judge module 1 that extends out, the 3rd described NMOS tube is connected with the input of described external signal amplification module 8.
Shown in figure three reference voltage: VREF0, VREF1 and VREF2 meet the relation of below equation:
VREF0 > VREF2 >=VREF1;
Wherein VREF0 is the magnitude of voltage of the 3rd reference power source, and VREF1 is the magnitude of voltage of the first reference power source, and VREF2 is the magnitude of voltage of the second reference power source.
In the present embodiment, three reference voltages meet following relation:
VREF2=0.5 × VREF0, VREF1=0.1 × VREF0;
Namely be down to constant-current charge stream with charging current, refer to constant current constant voltage control the built-in outlet tube charging current of module 4 1/10th as saturated basis for estimation; Described built-in outlet tube charging current could start when reaching the half of built-in outlet tube charging current and extends out charging.
Circuit realiration principle:
When the saturated judge module 2 that charges detects unsaturated cell, constant current constant voltage controls module 4 and output sampling drives module 5 to start working, and produces external output; Extend out enable judge module 1 and extend out output according to the feedback information startup of output.
Described output sampling drives the sampled current value Iext of module 5 to meet equation below:
Iext=p × Ichg, cc;
Wherein, the output sampling that p is described drives the oversampling ratio of module 5, and Ichg, cc is current value during constant-current charge.
From built-in outlet tube output current value, and exported the base stage of external PNP pipe by port E_out, to drive external pnp to manage. Driving electric current Ichg, the ext of external PNP pipe meet equation below:
Ichg, ext1=Iext × β;
Ichg, ext1=(p × Ichg, cc) β;
Wherein Ichg, cc are current value during constant-current charge, and β is the amplification coefficient of described external PNP pipe.
Whole system constant-current phase is treated the charging current Ichg of rechargeable battery and is represented by:
Ichg=Ichg, cc+(p × Ichg, cc) β;
Because the module 4 that controls constant current constant voltage detects all the time and the voltage of control output end, and the ideal base drive current of external PNP pipe also ratio exports electric current in built-in outlet tube simultaneously, the output electric current of external PNP pipe changes also with the current synchronization of internal drive pipe, so charging is to carry out according to the process of constant current constant voltage under internal circuit control.
When external PNP pipe base series current-limiting resistance Rpb, if Iext meets equation below:
Iext × Rpb < (VCC-| Vbe |);
Wherein VCC is supply voltage, and the BE that | Vbe | is PNP pipe ties pressure drop absolute value.
The then impact of the unrestricted leakage resistance Rpb of electric current in charging process;
If Iext meets equation below:
Iext × Rpb > (VCC-| Vbe |);
When then constant current is filled, the charging of external PNP pipe is represented by equation below:
Ichg, ext2=(VCC-| Vbe |)/Rpb × β;
As above formula have ignored the pressure drop between internal model pipe source and drain.
At this moment the charging current (stage is filled in constant current) of battery is represented by by whole system:
Ichg=Ichg, cc+(VCC-| Vbe |)/Rpb × β;
Filling the stage because charging current will be gradually reduced in constant voltage, Iext also will reduce therewith, when Iext is reduced to and meets equation below:
Iext≤(VCC-| Vbe |)/Rpb;
The output electric current of external PNP pipe will synchronize to reduce with Iext.
After entrance constant voltage fills the stage, being gradually reduced of charging current along with built-in power pipe and external PNP pipe, when saturated judge module 2 first time of charging detect built-in outlet tube electric current be reduced to stop filling some time, termination charging signals will be sent, because the effect of time delay module 3, stop filling signal to be first delivered to extend out enable judge module 1, make to extend out charging current to stop, the output electric current making built-in outlet tube is increased by this action, therefore the saturated judge module 2 that charges detects that unsaturation signal sends charging signals again, at this moment charging current is only provided by internal outlet tube, reduction along with charging current, the saturated judge module 2 that charges will again detect and stop charging stream, and stop whole charging process.
Without using external PNP pipe, stop charging when first time detects and stops filling.
Charge saturated judge process: when detecting that constant voltage fills the 1/N that stage current drops to electric current when constant current is filled, namely thinking saturated, N is set to 10 in the present embodiment.
Circuit work process describes:
When circuit starts battery is charged, the built-in outlet tube offer charging current of module 4 is first provided by described constant current constant voltage, its output electric current rises, voltage on sampling resistor R3 also increases, and when the voltage on sampling resistor R3 exceedes reference voltage VREF2, extends out the comparator output low level enabled in judge module 1, make rest-set flip-flop set, i.e. Q=1, starts external signal amplification module 8, and makes outside PNP pipe start to export charging current, along with battery 7 both end voltage to be charged rises near saturation value, charging current starts to reduce, voltage on sampling resistor R3 also declines therewith, when the VR3 at sampling resistor R3 two ends is reduced to reference voltage VREF1, the comparator making the saturated judge module 2 of charging is output as low level, this low level signal extends out, by making, the rest-set flip-flop reset enabled in judge module 1, Q end output low level signal, closedown extends out charge tunnel, the inside outlet tube output electric current that constant current constant voltage controls module 4 is made to increase, voltage on sampling resistor R3 raises, comparator output in saturated judge module 2 of charging becomes again high level, because the effect of time delay module 3, the former output low level signal of this comparator does not transmit rear stage circuit, constant current constant voltage controls module 4 and continues control circuit work. charging current continues to decline, until the voltage on sampling resistor R3 is down to reference voltage VREF1 again, makes the comparator in the saturated judge module 2 of charging again be reversed to level signal, postpones to close after the Tdly time whole output, charging termination through Postponement module 3.
If during constant-current charge, internal drive pipe output electric current is Ichg, cc, and external PNP pipe output electric current is Ichg, ext, and they and VREF1, VREF2 must meet below equation, to prevent from extending out the unlatching repeatedly of output, closedown.
(Ichg, ext/Ichg, cc) < (VREF2/VREF1);
Have employed the realization in this invention and extend out the constant-current constant-voltage charging circuit structure of function, have the advantages that
1, provide a kind of constant-current constant-voltage charging method having and extending out function, extend out in realization and the basis of charge function also achieves constant current constant voltage control, make its saturation detection value do not extended out pass effect by secondary detection technology.
2, circuit structure is simple, easy to use, it is adaptable to the constant-current constant-voltage charging of the various batteries that can be recycled, and has wider application scope.
In this description, the present invention is described with reference to its specific embodiment. But it is clear that still may be made that various amendment and conversion are without departing from the spirit and scope of the present invention. Therefore, specification and drawings is regarded in an illustrative, rather than a restrictive.
Claims (7)
1. a realization extends out the constant-current constant-voltage charging circuit structure of function, it is characterised in that described charging circuit configuration includes:
Constant current constant voltage controls module;
Output sampling drives module, and this output sampling drives the outfan that the first input end of module controls module with described constant current constant voltage to be connected;
Output sampling feedback module, the input of this output sampling feedback module drives the outfan of module to be connected with described output sampling, the first input end that the sample rate current feedback output end of this output sampling feedback module controls module with described constant current constant voltage is connected, the second input that the sampled voltage feedback output end of this output sampling feedback module controls module with described constant current constant voltage is connected, and total outfan of this output sampling feedback module is connected with battery to be charged;
External signal amplification module, is connected to described output sampling and drives between module and battery to be charged;
Time delay module, the 3rd input that the outfan of this time delay module controls module with described constant current constant voltage is connected;
Charge saturated judge module, and the input of the saturated judge module of this charging is connected with the sample rate current feedback output end of described output sampling feedback module, and the outfan of the saturated judge module of this charging is connected with described time delay module;
Extend out enable judge module, this extends out the first input end enabling judge module and is connected with the sample rate current feedback output end of described output sampling feedback module, this outfan extending out the second input and the described saturated judge module that charges enabling judge module is connected, and this extends out the outfan enabling judge module and drives the second input of module to be connected with described output sampling;
Described external signal amplification module includes an external PNP pipe and a current-limiting resistance, described current-limiting resistance is connected between outfan and the base stage of described external PNP pipe that described output sampling drives module, and the colelctor electrode of described external PNP pipe is connected with described battery to be charged.
2. realization according to claim 1 extends out the constant-current constant-voltage charging circuit structure of function, it is characterized in that, the saturated judge module of described charging includes at least one comparator, inverting input and first reference power source of the comparator of the described saturated judge module that charges are connected, the normal phase input end of comparator of the described saturated judge module that charges is connected with the sample rate current feedback output end of described output sampling feedback module, the outfan of the comparator of the described saturated judge module that charges respectively with the input of described time delay module, described the second input enabling judge module that extends out is connected.
3. realization according to claim 1 extends out the constant-current constant-voltage charging circuit structure of function, it is characterized in that, the described enable judge module that extends out includes a comparator and a rest-set flip-flop, the described normal phase input end extending out the comparator enabling judge module and the second reference power source are connected, the S end of described rest-set flip-flop is connected with the described outfan extending out the comparator enabling judge module, the R end of described rest-set flip-flop is connected with the outfan of the described saturated judge module that charges, the Q end of described rest-set flip-flop drives the second input of module to be connected with described output sampling.
4. realization according to claim 1 extends out the constant-current constant-voltage charging circuit structure of function, it is characterized in that, described constant current constant voltage controls module and includes a charging operational amplifier, inverting input and the 3rd reference power source of described charging operational amplifier are connected, first normal phase input end of described charging operational amplifier is connected with the sample rate current feedback output end of described output sampling feedback module, second normal phase input end of described charging operational amplifier is connected with the sampled voltage feedback output end of described output sampling feedback module, 3rd input of described charging operational amplifier is connected with the outfan of described time delay module.
5. realization according to claim 1 extends out the constant-current constant-voltage charging circuit structure of function, it is characterized in that, described output sampling feedback module includes the first PMOS, second PMOS, 4th PMOS, follow operational amplifier, sampling resistor, first feedback resistance and the second feedback resistance, described output sampling drives module by the second described PMOS, first PMOS is connected with described battery to be charged, the second described PMOS is connected with the 4th PMOS, one end that described sampling resistor is connected with the 4th described PMOS is as the sample rate current feedback output end of described output sampling feedback module, the other end of this sampling resistor is connected with described battery to be charged, the described outfan following operational amplifier is connected with the 4th described PMOS, the described inverting input following operational amplifier and the second PMOS are connected, the described normal phase input end following operational amplifier and the first PMOS are connected, first described feedback resistance one end is connected with the first described PMOS and battery to be charged respectively, the other end of this first feedback resistance is connected with the second described feedback resistance, second described feedback resistance one end respectively with the first described feedback resistance, described constant current constant voltage controls the second input of module and is connected, the other end of this second feedback resistance is connected with described battery to be charged.
6. realization according to claim 5 extends out the constant-current constant-voltage charging circuit structure of function, it is characterized in that, described output sampling drives module to include the first NMOS tube, second NMOS tube, 3rd NMOS tube, 3rd PMOS and the 5th PMOS, the first described NMOS tube is all connected with the 5th PMOS with the second NMOS tube, the 5th described PMOS is connected with the 4th described PMOS common gate, the 3rd described PMOS is connected with the second PMOS common gate, the outfan that the grid of the 3rd described PMOS controls module with described constant current constant voltage is connected, the 3rd described NMOS tube is connected with the second described NMOS tube, the grid of the 3rd described NMOS tube is connected with the described outfan enabling judge module that extends out, the 3rd described NMOS tube is connected with the input of described external signal amplification module.
7. realization according to any one of claim 1 to 6 extends out the constant-current constant-voltage charging circuit structure of function, it is characterized in that, described time delay module includes a constant-current source, the 6th PMOS, the 4th NMOS tube, an electric capacity and a phase inverter, the 6th described PMOS and the grid of the 4th NMOS tube are all connected to the outfan of the described saturated judge module that charges, the 6th described PMOS is connected with constant-current source, and the 3rd input that the 4th described NMOS tube controls module by described electric capacity, phase inverter with described constant current constant voltage is connected.
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| JP6537886B2 (en) * | 2015-05-18 | 2019-07-03 | エイブリック株式会社 | Constant current charging device |
| CN106410926A (en) * | 2016-09-21 | 2017-02-15 | 成都启立辰智科技有限公司 | Constant current charging circuit structure for electric vehicle |
| CN111463850A (en) * | 2020-03-25 | 2020-07-28 | 无锡艾为集成电路技术有限公司 | Charging current control circuit and control method, electronic equipment and charging method thereof |
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| US8159204B2 (en) * | 2008-09-29 | 2012-04-17 | Active-Semi, Inc. | Regulating current output from a buck converter without external current sensing |
| CN201904632U (en) * | 2010-12-27 | 2011-07-20 | 东莞市妙达电动工具制造有限公司 | Current-limiting and voltage-limiting lithium battery charging circuit based on comparator |
| CN202513639U (en) * | 2012-04-28 | 2012-10-31 | 深圳市瑞必达科技有限公司 | Charging circuit and three-phase battery charger |
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