CN203871879U - Lithium battery pack charging status indicating circuit - Google Patents
Lithium battery pack charging status indicating circuit Download PDFInfo
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- CN203871879U CN203871879U CN201420122063.XU CN201420122063U CN203871879U CN 203871879 U CN203871879 U CN 203871879U CN 201420122063 U CN201420122063 U CN 201420122063U CN 203871879 U CN203871879 U CN 203871879U
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Abstract
A lithium battery pack charging status indicating circuit comprises a lithium battery pack. The circuit is characterized in that the circuit also comprises a battery voltage sampling circuit, a gate circuit, a charging control circuit and an indicator light switch circuit; a third sample signal input terminal of the battery voltage sampling circuit is connected to the negative electrode of a first lithium battery; a second sample signal output terminal of the battery voltage sampling circuit is connected to a second sample signal input terminal of the gate circuit; a charging control triggering terminal is connected with a first sample signal input terminal of the gate circuit; a charging control input terminal is connected with the negative electrode of the first lithium battery; and a charging control output terminal is connected with a fourth sample signal input terminal of the battery voltage sampling circuit and then connected with the negative electrode of a charger. The circuit checks the battery life of each lithium battery, and only when each battery is fully charged, an indicator light is on, so that it is ensured that the entire battery pack is charged to the maximum capacity. The current of the indicator light is always powered by the external charger. Once the charger is removed, the indicator light is off, and the storage time of the battery pack is extended.
Description
Technical field
The utility model relates to a kind of charging indication, particularly a kind of charged state indicating circuit of lithium battery group.
Background technology
Lithium battery is that a class is negative material, the battery that uses non-aqueous electrolytic solution by lithium metal or lithium alloy.Lithium battery is because have the advantages that than conventional nickel-cadmium cell, Ni-MH battery power supply capacity is higher and power quality is lighter, by widely as the rechargeable battery of all kinds of portable or mobile products such as mobile phone, electric tool.
Lithium battery in use; overcharge, overdischarge and overcurrent all can affect battery and performance, are safe design, the battery core of lithium battery; especially lithium-ion electric core must install protective circuit additional, to prevent from overcharging, to cross danger such as putting the burning that causes with short circuit, blast.
At present, lithium battery of the prior art (group) charge protector is all designed with charging indication, this charging indication majority is all serially connected with light-emitting diode, by the change color of light-emitting diode in charging process, inform the charged state of user's battery, as orange expression is charged, green represent to be full of etc.; But, current this charging indication has certain defect, charging indication just detects the total voltage of battery (group), in the time of cannot guaranteeing for multiple serial lithium battery group that charging indicator light (light-emitting diode) is bright, every batteries has all been full of electricity, can cause the charging of every batteries inhomogeneous; In addition, existing charging indication is full of after electricity when battery, charging indicator light (light-emitting diode) if withdraw together with charger, the electric energy that indicator light certainly can consuming cells group, but, charging indicator light (as light-emitting diode) is if when be connected as a single entity with battery pack, and this charging indicator light can be always in illuminating state consuming cells electric weight, thereby reduces the resting period of battery.
Utility model content
Technical problem to be solved in the utility model is for above-mentioned prior art present situation, to provide a kind of to guarantee every batteries charging evenly and long charged state indicating circuit of battery pack resting period.
The utility model solves the problems of the technologies described above adopted technical scheme: a kind of charged state indicating circuit of lithium battery group, include the lithium battery that at least two joints are connected successively mutually, and it is characterized in that: described charged state indicating circuit also includes
Battery voltage sampling circuit, has a plurality of sampling inputs and a sampling output, and the positive and negative end of the described lithium battery of every joint is connected to respectively the correspondence sampling input of described battery voltage sampling circuit;
Gate circuit, includes the first sampled signal input, the second sampled signal input and the first sampled signal output, and the first sampled signal input of the sampling output of described battery voltage sampling circuit and described gate circuit is connected;
Charged state sample circuit, include the 3rd sampled signal input, the 4th sampled signal input and the second sampled signal output, the 3rd sampled signal input of described charged state sample circuit and the first segment cathode of lithium battery of described serial lithium battery are connected, and the second sampled signal output of described charged state sample circuit and the second sampled signal input of described gate circuit are connected;
Charging control circuit, include charging and control trigger end, charging control input end and charging control output end, the first sampled signal input that trigger end and described gate circuit are controlled in described charging is connected, the negative pole of the first segment lithium battery of described charging control input end and described serial lithium battery is connected, and after the 4th sampled signal input of described charging control output end and described charged state sample circuit connects altogether, can be connected with external charger negative pole;
Indicator light switch circuit, include indicator light trigger end, indicator light first input end and indicator light the second input, the first sampled signal output of described indicator light trigger end and described gate circuit is connected, after the 4th sampled signal output of described indicator light the second input and described charged state sample circuit connects altogether, can be connected with external charger negative pole, the positive pole of external charger can connect the positive pole of the final section lithium battery (DCn) of described serial lithium battery; And, between described indicator light first input end and the positive pole of described external charger, be serially connected with the light-emitting diode as indicator light, the negative pole of this light-emitting diode is connected with described indicator light first input end, and the positive pole of the final section lithium battery of the positive pole of this light-emitting diode and described serial lithium battery is connected.Indicator light can be used light-emitting diode, also can realize with other light sources.
As preferably, the sampled signal of described battery voltage sampling circuit can be series connection output, and this battery voltage sampling circuit includes voltage sample constant-current source, voltage sample comparator and the voltage sample AND circuit that corresponding each joint lithium battery arranges, wherein, described in each, the negative input of the voltage sample comparator of the positive pole of voltage sample constant-current source and corresponding this section lithium battery is connected, described in each, the electrode input end of voltage sample comparator is connected with the positive pole of corresponding this section lithium battery, described in each, the negative pole of voltage sample constant-current source is connected with the negative pole of corresponding this section lithium battery, described in each, the second input of the voltage sample AND circuit of the output of voltage sample comparator and corresponding this section lithium battery is connected, except first segment lithium battery, described in all the other each, the output of voltage sample AND circuit is directly connected with the first input end of the corresponding voltage sample AND circuit of an adjacent joint lithium battery below, and, the output of the corresponding voltage sample AND circuit of first segment lithium battery is as the sampling output of described battery voltage sampling circuit, and the first input end of the corresponding voltage sample AND circuit of final section lithium battery is directly connected with the positive pole of this final section lithium battery.
Preferred as another, the sampled signal of described battery voltage sampling circuit can be exported for parallel connection, and this battery voltage sampling circuit includes voltage sample constant-current source, voltage sample comparator, P channel voltage sampling field effect transistor, the second triode, the 3rd triode, the 4th resistance, the 5th resistance and the 6th resistance that corresponding each joint lithium battery arranges, wherein, described in each, the negative input of the voltage sample comparator of the positive pole of voltage sample constant-current source and corresponding this section lithium battery is connected, described in each, the electrode input end of voltage sample comparator is connected with the positive pole of corresponding this section lithium battery, described in each, the negative pole of voltage sample constant-current source is connected with the negative pole of corresponding this section lithium battery, described in each, the grid of the voltage sample field effect transistor of the output of voltage sample comparator and corresponding this section lithium battery is connected, described in each, the source electrode of voltage sample field effect transistor is connected with the positive pole of corresponding this section lithium battery, described in each, the drain electrode of voltage sample field effect transistor is divided into two-way after being connected to altogether a bit, one tunnel is connected with the negative pole of first segment lithium battery through described the 6th resistance, another road is connected with the base stage of described the second triode, the collector electrode first via of this second triode connects DC power supply through described the 4th resistance, the second tunnel is connected with the base stage of described the 3rd triode, the collector electrode of described the 3rd triode connects described DC power supply as the sampling output of described battery voltage sampling circuit through described the 5th resistance, the emitter of the emitter of described the second triode and described the 3rd triode connects the negative pole of the described first segment lithium battery of rear connection altogether.
As preferably, described gate circuit can be AND circuit, the first input end of described AND circuit is connected as the sampling output of described the first sampled signal input and described battery voltage sampling circuit, the second input of this AND circuit is connected as the second sampled signal output of described the second sampled signal input and described charged state sample circuit, and the output of this AND circuit is connected with described indicator light trigger end as described the first sampled signal output.
Preferred as another, described gate circuit can be also OR-NOT circuit, the first input end of described OR-NOT circuit is connected as the sampling output of described the first sampled signal input and described battery voltage sampling circuit, the second input of this OR-NOT circuit is connected as the second sampled signal output of described the second sampled signal input and described charged state sample circuit, and the output of this OR-NOT circuit is connected with described indicator light trigger end as described the first sampled signal output.
As preferably, described charged state sample circuit can be comparator simply, the electrode input end of described comparator is connected with described indicator light the second input, the negative pole of the first segment lithium battery of the negative input of this comparator and described serial lithium battery is connected, and the second sampled signal input of the output of described comparator and described gate circuit is connected.
In order to prevent comparator misoperation, improve the detection accuracy of comparator, as preferably, described charged state sample circuit also includes voltage stabilizing DC source, the positive pole of described voltage stabilizing DC source is connected with the electrode input end of described comparator, and the negative pole of described voltage stabilizing DC source is connected with described indicator light the second input.
As preferably, described charging control circuit can be following structure, this charging control circuit includes not circuit and N raceway groove the first field effect transistor, the first sampled signal input of the input of described not circuit and described gate circuit is connected, the output of described not circuit is connected with the grid of described the first field effect transistor, and the drain electrode of this first field effect transistor is connected with the negative pole of described first segment lithium battery; Correspondingly, described indicator light switch circuit includes N raceway groove the second field effect transistor, the grid of described the second field effect transistor is connected with the output of described gate circuit, the source electrode of described the second field effect transistor is connected with the source electrode of described the first field effect transistor, the drain electrode of described the second field effect transistor is connected with the light-emitting diode negative pole as indicator light, and the positive pole of the final section lithium battery of the positive pole of light-emitting diode and described serial lithium battery is connected.
Preferred as another, described charging control circuit can be also following structure: this charging control circuit includes the first resistance, the second resistance, the first triode, N raceway groove the 3rd field effect transistor and P raceway groove the 4th field effect transistor, wherein, the drain electrode of the 3rd described field effect transistor is connected with the negative pole of described first segment lithium battery, grid one tunnel of the 3rd field effect transistor is connected with DC power supply through described the first resistance, another road is connected with the collector electrode of described the first triode, base stage one tunnel of described the first triode is connected with the emitter of this first triode through described the second resistance, another road is connected with the drain electrode of described the 4th field effect transistor, the source electrode of the 4th field effect transistor connects described DC power supply, the first sampled signal input that the grid of the 4th field effect transistor is controlled trigger end and described gate circuit as charging is connected, correspondingly, described indicator light switch circuit includes the 3rd resistance and the 4th triode, base stage one tunnel of described the 4th triode and the first sampled signal output of described gate circuit are connected, another road is connected with the emitter of the 4th triode through described the 3rd resistance, the collector electrode of described the 4th triode is connected with the light-emitting diode negative pole as indicator light, the positive pole of the final section lithium battery of the positive pole of light-emitting diode and described serial lithium battery is connected, after connecing altogether, the emitter of the source electrode of described the 3rd field effect transistor and the first triode is connected with the emitter of described the 4th triode.
Compared with prior art, the utility model has the advantage of: existing charged state indicating circuit is improved, make charging indication after improving when work, can detect the electric weight of each joint lithium battery, only at every joint lithium battery, be all full of after electricity, indicator light is just bright, to guarantee that whole batteries charging is to heap(ed) capacity; In addition, circuit design scheme of the present utility model can guarantee that the electric current of charging indicator light powered by external charger all the time, if indicator light and battery pack are connected as a single entity, once charger is withdrawn, indicator light does not work, in battery pack, be full of the electric weight that electric rear indicator light can consuming cells, thereby extend the resting period of battery pack.
Accompanying drawing explanation
Fig. 1 is one of circuit theory diagrams of the present utility model.
Fig. 2 is two of circuit theory diagrams of the present utility model.
Fig. 3 is the particular circuit configurations figure of the utility model embodiment mono-.
Fig. 4 is the particular circuit configurations figure of the utility model embodiment bis-.
Fig. 5 is the particular circuit configurations figure of the utility model embodiment tri-.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
As shown in Figure 1 and Figure 2, be circuit theory diagrams of the present utility model, the utility model relates to a kind of charged state indicating circuit of lithium battery group, and this charged state indicating circuit includes
Lithium battery DCi (the i=1,2 that at least two joints are connected successively mutually ... n);
Battery voltage sampling circuit 1, has a plurality of sampling inputs and a sampling output 12, every joint lithium battery DCi (i=1,2 ... n) positive and negative end is connected to respectively the correspondence sampling input of battery voltage sampling circuit 1;
Gate circuit 2, includes the first sampled signal input 21, the second sampled signal input 22 and the first sampled signal output 23, and the first sampled signal input 21 of the sampling output of battery voltage sampling circuit 1 and gate circuit 2 is connected;
Charged state sample circuit 3, include the 3rd sampled signal input 31, the 4th sampled signal input 32 and the second sampled signal output 33, the first segment lithium battery DC1 negative pole of the 3rd sampled signal input 31 of charged state sample circuit 3 and serial lithium battery is connected, and the second sampled signal output 33 of charged state sample circuit 3 and the second sampled signal input 22 of gate circuit 2 are connected;
Charging control circuit 4, include charging and control trigger end 41, charging control input end 42 and charging control output end 43, the first sampled signal input 21 that trigger end 41 and gate circuit 2 are controlled in charging is connected, the negative pole of the first segment lithium battery DC1 of charging control input end 42 and serial lithium battery is connected, and after the 4th sampled signal input 32 of charging control output end 43 and charged state sample circuit 3 connects altogether, can be connected with external charger 6 negative poles;
Indicator light switch circuit 5, include indicator light trigger end 51, indicator light first input end 52 and indicator light the second input 53, the first sampled signal output 23 of indicator light trigger end 51 and gate circuit 2 is connected, and after the 4th sampled signal input 32 of indicator light the second input 53 and charged state sample circuit 3 connects altogether, can be connected with external charger 6 negative poles.
Indicator light in charged state indicating circuit of the present utility model is preferably LED (indicator light can be also other light source), this LED is to be connected between indicator light first input end 52 and the positive pole of external charger 6, the negative pole of LED is connected with indicator light first input end 52, and the positive pole of the positive pole of LED and external charger 6 connects the positive pole of the final section lithium battery DCn of rear connection serial lithium battery altogether; LED can be connected as a single entity with lithium battery group, only has the positive and negative end of charger 6 can depart from lithium battery circuit, referring to Fig. 1; LED also can be connected as a single entity with charger 6, and the both positive and negative polarity of the negative pole of LED, charger 6 all can depart from lithium battery circuit, referring to Fig. 2.Fig. 3～Fig. 5 is for the designed physical circuit johning knot composition of the utility model circuit theory diagrams.
Embodiment mono-, as shown in Figure 3:
The present embodiment includes the lithium battery DCi (i=1,2 that more piece is connected successively mutually ... n), battery voltage sampling circuit, gate circuit, charged state sample circuit, charging control circuit, indicator light switch circuit, LED and dismountable external charger 6.
Wherein, battery voltage sampling circuit includes corresponding each joint lithium battery DCi (i=1,2 ... n) the voltage sample constant-current source Ei (i=1,2 arranging ... n), voltage sample comparator BGi (i=1,2 ... n) and voltage sample AND circuit ANDi (i=1,2 ... n);
Each voltage sample constant-current source Ei (i=1, 2 ... n) positive pole and corresponding this section lithium battery DCi (i=1, 2 ... n) voltage sample comparator BGi (i=1, 2 ... n) negative input is connected, each voltage sample comparator BGi (i=1, 2 ... n) electrode input end and corresponding this section lithium battery DCi (i=1, 2 ... n) positive pole is connected, each voltage sample constant-current source Ei (i=1, 2 ... n) negative pole and corresponding this section lithium battery DCi (i=1, 2 ... n) negative pole is connected, each voltage sample comparator BGi (i=1, 2 ... n) output and corresponding this section lithium battery DCi (i=1, 2 ... n) voltage sample AND circuit ANDi (i=1, 2 ... n) the second input is connected, except first segment lithium battery DC1, all the other each voltage sample AND circuit ANDi (i=1, 2 ... n) output is directly connected with the first input end of the corresponding voltage sample AND circuit of an adjacent joint lithium battery below, the output of the corresponding voltage sample AND circuit of first segment lithium battery DC1 AND1 is as the sampling output of whole battery voltage sampling circuit 1, and the first input end of the corresponding voltage sample AND circuit of final section lithium battery DCn ANDn is directly connected with the positive pole of this final section lithium battery DCn.
Gate circuit adopts AND circuit AND0, charged state sample circuit is comparator BGO, wherein, the first input end of AND circuit AND0 is connected with the output of the corresponding voltage sample AND circuit of first segment lithium battery DC1 AND1, the second input of AND circuit AND0 is connected with the output of comparator BGO, and the negative pole of the first segment lithium battery DC1 of the negative input of comparator BGO and serial lithium battery is connected.
Charging control circuit 4 includes not circuit INVO and N raceway groove the first field effect transistor K1, the input of not circuit INVO is connected with the first input end of AND circuit AND0, the output of not circuit INVO is connected with the grid of the first field effect transistor K1, and the drain electrode of the first field effect transistor K1 is connected with the negative pole of first segment lithium battery DC1;
Correspondingly, indicator light switch circuit 5 includes N raceway groove the second field effect transistor K2, the grid of the second field effect transistor K2 is connected with the output of AND circuit AND0, after connecing altogether, the source electrode of the source electrode of the second field effect transistor K2 and the first field effect transistor K1 is connected with the electrode input end of comparator BGO, the drain electrode of the second field effect transistor K2 is connected with the LED negative pole as indicator light, the anodal positive pole that connects final section lithium battery DCn of this LED; Dismountable being connected on charging indication in two ends of charger 6, wherein, the positive pole of charger 6 and the negative pole of LED connect the positive pole of rear connection final section lithium battery DCn altogether, and the source electrode of negative pole with the second field effect transistor K2 of charger 6 is connected.
The operation principle of foregoing circuit is: after external charger 6, lithium battery group is initially located in charged state, as long as there is a joint lithium battery not to be full of electricity, the sampling output 12 of battery voltage sampling circuit does not just have signal output, only have and be all full of after electricity when whole lithium batteries, the sampling output 12 of battery voltage sampling circuit just outputs signal to subsequent conditioning circuit, guarantee that thus every joint lithium battery can charge evenly, whole batteries charging is to heap(ed) capacity, now, LED is lighted, and the electric weight of prompting lithium battery is full of; After withdrawing charger 6, voltage between two inputs of comparator BGO recovered nought state, now, the first field effect transistor K1 and the second field effect transistor K2 disconnect, LED extinguishes, be that LED no longer continues to light after external charger is withdrawn, can not consume the electric energy of lithium battery group, extend the resting period of lithium battery group.
Embodiment bis-, as shown in Figure 4:
The circuit difference of the circuit of the present embodiment and embodiment mono-is: charging control circuit is different with indicator light switch circuit, and remaining circuit connection structure is identical with embodiment mono-.
The charging control circuit 4 of the present embodiment includes the first resistance R 1, the second resistance R 2, the first triode Q1, N raceway groove the 3rd field effect transistor K3 and P raceway groove the 4th field effect transistor K4, wherein, the drain electrode of the 3rd field effect transistor K3 is connected with the negative pole of first segment lithium battery DC1, grid one tunnel the first resistance R 1 of the 3rd field effect transistor K3 is connected with DC power supply DC, another road is connected with the collector electrode of the first triode Q1, base stage one tunnel the second resistance R 2 of the first triode Q1 is connected with the emitter of this first triode Q1, another road is connected with the drain electrode of the 4th field effect transistor K4, the source electrode of the 4th field effect transistor K4 connects described DC power supply DC, the grid of the 4th field effect transistor K4 is controlled trigger end as charging and is connected with the first input end of AND circuit AND0,
Correspondingly, indicator light switch circuit 5 includes the 3rd resistance R 3 and the 4th triode Q4, base stage one tunnel of the 4th triode Q4 is connected with the output of AND circuit AND0, another Lu Jing tri-resistance R 3 are connected with the emitter of the 4th triode Q4, the collector electrode of the 4th triode Q4 is connected with LED negative pole, the positive pole of the positive pole of LED and charger 6 connects the positive pole of rear connection final section lithium battery DCn altogether, the negative pole of charger 6 is connected on the emitter of the 4th triode Q4, after connecing altogether, the emitter of the source electrode of the 3rd field effect transistor K3 and the first triode Q1 is connected with the emitter of the 4th triode Q4, the electrode input end of comparator BGO is also connected to the emitter of the 4th triode Q4 altogether.
The circuit working principle of the present embodiment is identical with embodiment mono-.
Embodiment tri-, as shown in Figure 5:
The present embodiment includes the lithium battery DCi (i=1,2 that more piece is connected successively mutually ... n), battery voltage sampling circuit, gate circuit, charged state sample circuit, charging control circuit, indicator light switch circuit, dismountable LED and dismountable external charger 6.
Wherein, the battery voltage sampling circuit of the present embodiment adopts following structure: this battery voltage sampling circuit includes corresponding each joint lithium battery DCi (i=1,2 ... n) the voltage sample constant-current source Ei (i=1,2 arranging ... n), voltage sample comparator BGi (i=1,2 ... n), P channel voltage sampling field effect transistor Kdi (i=1,2 ... n), the second triode Q2, the 3rd triode Q3, the 4th resistance R 4, the 5th resistance R 5 and the 6th resistance R 6;
Wherein, each voltage sample constant-current source Ei (i=1, 2 ... n) positive pole and corresponding this section lithium battery DCi (i=1, 2 ... n) voltage sample comparator BGi (i=1, 2 ... n) negative input is connected, each voltage sample comparator BGi (i=1, 2 ... n) electrode input end and corresponding this section lithium battery DCi (i=1, 2 ... n) positive pole is connected, each voltage sample constant-current source Ei (i=1, 2 ... n) negative pole and corresponding this section lithium battery DCi (i=1, 2 ... n) negative pole is connected, each voltage sample comparator BGi (i=1, 2 ... n) output and corresponding this section lithium battery DCi (i=1, 2 ... n) voltage sample field effect transistor Kdi (i=1, 2 ... n) grid is connected, each voltage sample field effect transistor Kdi (i=1, 2 ... n) source electrode and corresponding this section lithium battery DCi (i=1, 2 ... n) positive pole is connected, each voltage sample field effect transistor Kdi (i=1, 2 ... n) drain electrode is divided into two-way after being connected to altogether a bit, one tunnel the 6th resistance R 6 is connected with the negative pole of first segment lithium battery DC1, another road is connected with the base stage of the second triode Q2, the collector electrode first via of this second triode Q2 connects DC power supply through the 4th resistance R 4, the second tunnel is connected with the base stage of the 3rd triode Q3, the collector electrode of the 3rd triode Q3 connects described DC power supply DC as the sampling output of battery voltage sampling circuit through the 5th resistance R 5, the emitter of the emitter of the second triode Q2 and the 3rd triode Q3 connects the negative pole of rear connection first segment lithium battery DC1 altogether.
The gate circuit of the present embodiment adopts OR-NOT circuit OR, charged state sample circuit 3 is comparator BGO, the first input end of OR-NOT circuit OR is connected with the collector electrode of the 3rd triode Q3, the second input of OR-NOT circuit OR is connected with the output of comparator BGO, the negative pole of the first segment lithium battery DC1 of the negative input of comparator BGO and serial lithium battery is connected, and the second sampled signal input 22 of the output of comparator BGO and gate circuit 2 is connected.
Charging control circuit 4 includes the first resistance R 1, the second resistance R 2, the first triode Q1, the 3rd field effect transistor K3 and the 4th field effect transistor K4, wherein, the drain electrode of the 3rd field effect transistor K3 is connected with the negative pole of first segment lithium battery DC1, grid one tunnel the first resistance R 1 of the 3rd field effect transistor K3 is connected with DC power supply DC, another road is connected with the collector electrode of the first triode Q1, base stage one tunnel the second resistance R 2 of the first triode Q1 is connected with the emitter of this first triode Q1, another road is connected with the drain electrode of the 4th field effect transistor K4, the source electrode of the 4th field effect transistor K4 connects DC power supply DC, the grid of the 4th field effect transistor K4 is controlled trigger end as charging and is connected with the first input end of OR-NOT circuit OR.
Correspondingly, indicator light switch circuit 5 includes the 3rd resistance R 3 and the 4th triode Q4, base stage one tunnel of the 4th triode Q4 is connected with the output of OR-NOT circuit OR, another Lu Jing tri-resistance R 3 are connected with the emitter of the 4th triode Q4, the collector electrode of the 4th triode Q4 is connected with LED negative pole, the electrode input end of comparator BGO, the emitter of the source electrode of the 3rd field effect transistor K3 and the first triode Q1 connects altogether and is all connected with the emitter of the 4th triode Q4 afterwards, the positive pole of charger 6 and the positive pole of LED connect the positive pole of rear connection final section lithium battery DCn altogether, the negative pole of charger 6 is connected on the emitter of the 4th triode Q4.
The operation principle of the present embodiment is identical with embodiment mono-, the different particular circuit configurations that adopts the battery voltage sampling circuit of the present embodiment and gate circuit has realized the same effect of corresponding circuits in embodiment mono-and embodiment bis-, can be by the related circuit structure of the battery voltage sampling circuit in the first two embodiment and gate circuit alternative costs embodiment, can reach equally guarantee every joint lithium cell charging all even light-emitting diode after charger is removed, do not consume the object of lithium battery group electric energy.
In addition, in order to guarantee job stability and the reliability of comparator circuit, avoid interference and misoperation, charged state sample circuit 3 in above-mentioned three embodiment is interior can also include a voltage stabilizing DC source E0, referring to Fig. 5, the positive pole of this voltage stabilizing DC source E0 is connected with the electrode input end of comparator BGO, and the negative pole of voltage stabilizing DC source E0 is connected with the indicator light of indicator light switch circuit 5 the second input 53, be shown in Fig. 5, the negative pole of voltage stabilizing DC source E0 is connected with the emitter of the 4th triode Q4.
Claims (9)
1. a charged state indicating circuit for lithium battery group, includes lithium battery (DC1, DC2 that at least two joints are connected successively mutually ... DCn), it is characterized in that: described charged state indicating circuit also includes
Battery voltage sampling circuit (1), there is a plurality of sampling inputs and a sampling output (12), the described lithium battery of every joint (DC1, DC2 ... DCn) positive and negative end is connected to respectively the correspondence sampling input of described battery voltage sampling circuit (1);
Gate circuit (2), include the first sampled signal input (21), the second sampled signal input (22) and the first sampled signal output (23), the first sampled signal input (21) of the sampling output of described battery voltage sampling circuit (1) and described gate circuit (2) is connected;
Charged state sample circuit (3), include the 3rd sampled signal input (31), the 4th sampled signal input (32) and the second sampled signal output (33), the 3rd sampled signal input (31) of described charged state sample circuit (3) and first segment lithium battery (DC1) negative pole of described serial lithium battery are connected, and the second sampled signal output (33) of described charged state sample circuit (3) and the second sampled signal input (22) of described gate circuit (2) are connected;
Charging control circuit (4), include charging and control trigger end (41), charging control input end (42) and charging control output end (43), the first sampled signal input (21) that trigger end (41) and described gate circuit (2) are controlled in described charging is connected, the negative pole of the first segment lithium battery (DC1) of described charging control input end (42) and described serial lithium battery is connected, and after the 4th sampled signal input (32) of described charging control output end (43) and described charged state sample circuit (3) connects altogether, can be connected with external charger (6) negative pole;
Indicator light switch circuit (5), include indicator light trigger end (51), indicator light first input end (52) and indicator light the second input (53), the first sampled signal output (23) of described indicator light trigger end (51) and described gate circuit (2) is connected, after the 4th sampled signal input (32) of described indicator light the second input (53) and described charged state sample circuit (3) connects altogether, can be connected with external charger (6) negative pole, the positive pole of external charger (6) can connect the positive pole of the final section lithium battery (DCn) of described serial lithium battery; And, between the positive pole of described indicator light first input end (52) and described external charger (6), be serially connected with the light-emitting diode (LED) as indicator light, the indicator light first input end (52) of the negative pole of this light-emitting diode (LED) and described indicator light switch circuit (5) is connected, and the positive pole of the final section lithium battery (DCn) of the positive pole of this light-emitting diode (LED) and described serial lithium battery is connected.
2. the charged state indicating circuit of lithium battery group according to claim 1, is characterized in that: described battery voltage sampling circuit (1) includes corresponding each joint lithium battery (DC1, DC2 ... DCn) the voltage sample constant-current source (E1, the E2 that arrange ... En), voltage sample comparator (BG1, BG2 ... BGn) and voltage sample AND circuit (AND1, AND2 ... ANDn);
Wherein, described in each, the negative input of the voltage sample comparator of the positive pole of voltage sample constant-current source and corresponding this section lithium battery is connected, described in each, the electrode input end of voltage sample comparator is connected with the positive pole of corresponding this section lithium battery, described in each, the negative pole of voltage sample constant-current source is connected with the negative pole of corresponding this section lithium battery, described in each, the second input of the voltage sample AND circuit of the output of voltage sample comparator and corresponding this section lithium battery is connected, except first segment lithium battery (DC1), described in all the other each, the output of voltage sample AND circuit is directly connected with the first input end of the corresponding voltage sample AND circuit of an adjacent joint lithium battery below,
And, the output of the corresponding voltage sample AND circuit of first segment lithium battery (DC1) is as the sampling output of described battery voltage sampling circuit (1), and the first input end of the corresponding voltage sample AND circuit of final section lithium battery (DCn) is directly connected with the positive pole of this final section lithium battery (DCn).
3. the charged state indicating circuit of lithium battery group according to claim 1, is characterized in that: described battery voltage sampling circuit (1) includes corresponding each joint lithium battery (DC1, DC2 ... DCn) the voltage sample constant-current source (E1, the E2 that arrange ... En), voltage sample comparator (BG1, BG2 ... BGn), P channel voltage sampling field effect transistor (Kd1, Kd2 ... Kdn), the second triode (Q2), the 3rd triode (Q3), the 4th resistance (R4), the 5th resistance (R5) and the 6th resistance (R6);
Wherein, described in each, the negative input of the voltage sample comparator of the positive pole of voltage sample constant-current source and corresponding this section lithium battery is connected, described in each, the electrode input end of voltage sample comparator is connected with the positive pole of corresponding this section lithium battery, described in each, the negative pole of voltage sample constant-current source is connected with the negative pole of corresponding this section lithium battery, described in each, the grid of the voltage sample field effect transistor of the output of voltage sample comparator and corresponding this section lithium battery is connected, described in each, the source electrode of voltage sample field effect transistor is connected with the positive pole of corresponding this section lithium battery, described in each, the drain electrode of voltage sample field effect transistor is divided into two-way after being connected to altogether a bit, one tunnel is connected with the negative pole of first segment lithium battery (DC1) through described the 6th resistance (R6), another road is connected with the base stage of described the second triode (Q2), the collector electrode first via of this second triode (Q2) connects DC power supply through described the 4th resistance (R4), the second tunnel is connected with the base stage of described the 3rd triode (Q3), the collector electrode of described the 3rd triode (Q3) connects described DC power supply as the sampling output of described battery voltage sampling circuit (1) through described the 5th resistance (R5), the emitter of the emitter of described the second triode (Q2) and described the 3rd triode (Q3) connects the negative pole of the described first segment lithium battery of rear connection (DC1) altogether.
4. the charged state indicating circuit of lithium battery group according to claim 1, it is characterized in that: described gate circuit (2) is AND circuit (AND0), the first input end of described AND circuit (AND0) is connected with the sampling output of described battery voltage sampling circuit (1) as described the first sampled signal input (21), second input of this AND circuit (AND0) is connected as the second sampled signal output (33) of described the second sampled signal input (22) and described charged state sample circuit (3), the output of this AND circuit (AND0) is connected with described indicator light trigger end (51) as described the first sampled signal output (23).
5. the charged state indicating circuit of lithium battery group according to claim 1, it is characterized in that: described gate circuit (2) is OR-NOT circuit (OR), the first input end of described OR-NOT circuit (OR) is connected with the sampling output of described battery voltage sampling circuit (1) as described the first sampled signal input (21), second input of this OR-NOT circuit (OR) is connected as the second sampled signal output (33) of described the second sampled signal input (22) and described charged state sample circuit (3), the output of this OR-NOT circuit (OR) is connected with described indicator light trigger end (51) as described the first sampled signal output (23).
6. the charged state indicating circuit of lithium battery group according to claim 1, it is characterized in that: described charged state sample circuit (3) is comparator (BGO), the electrode input end of described comparator (BGO) is connected with described indicator light the second input (53), the negative pole of the first segment lithium battery (DC1) of the negative input of this comparator (BGO) and described serial lithium battery is connected, and the second sampled signal input (22) of the output of described comparator (BGO) and described gate circuit (2) is connected.
7. the charged state indicating circuit of lithium battery group according to claim 6, it is characterized in that: described charged state sample circuit (3) also includes voltage stabilizing DC source (E0), the positive pole of described voltage stabilizing DC source (E0) is connected with the electrode input end of described comparator (BGO), and the negative pole of described voltage stabilizing DC source (E0) is connected with described indicator light the second input (53).
8. the charged state indicating circuit of lithium battery group according to claim 1, it is characterized in that: described charging control circuit (4) includes not circuit (INVO) and N raceway groove the first field effect transistor (K1), the first sampled signal input (21) of the input of described not circuit (INVO) and described gate circuit (2) is connected, the output of described not circuit (INVO) is connected with the grid of described the first field effect transistor (K1), and the drain electrode of this first field effect transistor (K1) is connected with the negative pole of described first segment lithium battery (DC1);
Correspondingly, described indicator light switch circuit (5) includes N raceway groove the second field effect transistor (K2), the output (23) of the grid of described the second field effect transistor (K2) and described gate circuit (2) is connected, the source electrode of described the second field effect transistor (K2) is connected with the source electrode of described the first field effect transistor (K1), the drain electrode of described the second field effect transistor (K2) is connected with light-emitting diode (LED) negative pole, and the positive pole of the final section lithium battery (DCn) of the positive pole of this light-emitting diode (LED) and described serial lithium battery is connected.
9. the charged state indicating circuit of lithium battery group according to claim 1, it is characterized in that: described charging control circuit (4) includes the first resistance (R1), the second resistance (R2), the first triode (Q1), N raceway groove the 3rd field effect transistor (K3) and P raceway groove the 4th field effect transistor (K4), wherein, the drain electrode of the 3rd described field effect transistor (K3) is connected with the negative pole of described first segment lithium battery (DC1), grid one tunnel of the 3rd field effect transistor (K3) is connected with DC power supply through described the first resistance (R1), another road is connected with the collector electrode of described the first triode (Q1), base stage one tunnel of described the first triode (Q1) is connected with the emitter of this first triode (Q1) through described the second resistance (R2), another road is connected with the drain electrode of described the 4th field effect transistor (K4), the source electrode of the 4th field effect transistor (K4) connects described DC power supply, the first sampled signal input (21) that the grid of the 4th field effect transistor (K4) is controlled trigger end (41) and described gate circuit (2) as charging is connected,
Correspondingly, described indicator light switch circuit (5) includes the 3rd resistance (R3) and the 4th triode (Q4), the first sampled signal output (23) of base stage one tunnel of described the 4th triode (Q4) and described gate circuit (2) is connected, another road is connected with the emitter of the 4th triode (Q4) through described the 3rd resistance (R3), the collector electrode of described the 4th triode (Q4) is connected with light-emitting diode (LED) negative pole, the positive pole of the final section lithium battery (DCn) of the positive pole of this light-emitting diode (LED) and described serial lithium battery is connected, after connecing altogether, the emitter of the source electrode of described the 3rd field effect transistor (K3) and the first triode (Q1) is connected with the emitter of described the 4th triode (Q4).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122063.XU CN203871879U (en) | 2014-03-18 | 2014-03-18 | Lithium battery pack charging status indicating circuit |
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| CN201420122063.XU CN203871879U (en) | 2014-03-18 | 2014-03-18 | Lithium battery pack charging status indicating circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872733A (en) * | 2014-03-18 | 2014-06-18 | 何岳明 | Charging state indicating circuit of lithium battery pack |
| CN104475906A (en) * | 2014-10-30 | 2015-04-01 | 东莞莱玛电子科技有限公司 | Charging electric soldering iron device |
| WO2015176554A1 (en) * | 2014-05-23 | 2015-11-26 | 无锡英诺浦斯微电子有限公司 | Battery power detection display method and device |
| CN106772088A (en) * | 2016-12-28 | 2017-05-31 | 浙江威星智能仪表股份有限公司 | A kind of tool circuit of automatic batch detection lithium thionyl chloride cell |
-
2014
- 2014-03-18 CN CN201420122063.XU patent/CN203871879U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103872733A (en) * | 2014-03-18 | 2014-06-18 | 何岳明 | Charging state indicating circuit of lithium battery pack |
| CN103872733B (en) * | 2014-03-18 | 2016-05-25 | 何岳明 | A kind of charged state indicating circuit of lithium battery group |
| WO2015176554A1 (en) * | 2014-05-23 | 2015-11-26 | 无锡英诺浦斯微电子有限公司 | Battery power detection display method and device |
| CN104475906A (en) * | 2014-10-30 | 2015-04-01 | 东莞莱玛电子科技有限公司 | Charging electric soldering iron device |
| CN106772088A (en) * | 2016-12-28 | 2017-05-31 | 浙江威星智能仪表股份有限公司 | A kind of tool circuit of automatic batch detection lithium thionyl chloride cell |
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