CN102175977A - Lithium battery detection device with mutual charge/discharge function - Google Patents
Lithium battery detection device with mutual charge/discharge function Download PDFInfo
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Abstract
The invention relates to a lithium battery detection device with a mutual charge/discharge function. The device is characterized by mainly comprising an enclosure, a clamp and a mutual charge/discharge control circuit, wherein the clamp for a battery to be detected and an energy storage battery is arranged on the surface of the enclosure, and the mutual charge/discharge control circuit consists of a relay, a charge/discharge switching circuit, a boost-buck circuit and a singlechip control circuit; and the singlechip control circuit is connected with the boost-buck circuit and a relay driving circuit. Because of the realization of the lithium battery pack detection device with the mutual charge/discharge function, the problems of energy conservation and emission reduction in charge/discharge detection of a battery or a battery pack can be well solved, a large amount of power utilization cost is saved, and the detection productivity can be improved; and because of full utilization of energy, the emission of heat is reduced, and influence on equipment operation, guarantee of battery quality, staff operating environment and the like is greatly improved.
Description
Technical field
The invention belongs to the lithium battery pick-up unit, relate in particular to a kind of lithium battery pick-up unit that discharges and recharges function each other that has.
Background technology
Rechargeable battery is called secondary cell again, is meant behind battery discharge to make active substance activate the battery that continues use by the mode of charging.The charge and discharge cycles of rechargeable battery can reach thousands of times, so the more economical practicality of its relative dry cell.For secondary cell, be an important parameter weighing the battery performance quality serviceable life.Secondary cell is called one-period through once charging and discharging.Under certain system that discharges and recharges, battery capacity reaches the life cycle that number of times is called secondary cell that discharges and recharges that battery can stand before a certain setting.Lithium ion battery has good shelf characteric and long cycle life.Secondary cell needs the key property to battery in process of production: dozens of parameters such as operating voltage, charging voltage and the electric current of the shunting voltage of battery, the internal resistance of battery, battery, capacity detect.Charging voltage is meant secondary cell when charging, and external power is added in the voltage at battery two ends.The basic skills of charging is constant voltage charging behind the first constant current charge, and its constant current characteristics are that charging current is invariable in charging process.Along with the carrying out of charging, active substance is resumed, and the electrode reaction area constantly dwindles, and polarization of electrode increases gradually.At present, battery production generally adopts direct supply or charger charging, the test or the detection method of resistance-type discharge.The structure of pick-up unit comprises that the control gear of charging set, discharge circuit, signals collecting and change-over circuit constitute.By cycle collection, detect every performance of battery to the battery charging and discharging signal.This kind method is that a kind of need become heat with electric energy and the detection mode that bleeds off in vain.Along with the expansion of battery industry, the waste of this energy more and more highlights.The equipment that has has at present adopted the method that back electric quantity is fed to electrical network.Just can use but must become pure alternating current, and the electric weight of user institute feedback is not easy again to get the nod, variety of problems makes and adopts the equipment of the method can not be by widespread usage.Battery industry demands developing a kind of lithium battery pick-up unit of not only having saved the energy but also having improved detection efficiency urgently.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned technology, and provide a kind of simple and practical lithium battery pick-up unit that discharges and recharges function each other that has, in testing process, the electric weight that it can be emitted when detecting battery discharge, charge to another group energy-storage battery simultaneously, charging and discharging process has not only been saved the energy but also improved detection efficiency each other.Also can detect two Battery packs simultaneously, also the electric weight that stores can being used for down, the charging of primary cell detects.
The present invention for achieving the above object, by the following technical solutions: a kind of have a lithium battery pick-up unit that discharges and recharges function each other, it is characterized in that: mainly contain casing, place the mesuring battary on casing surface and the anchor clamps of energy-storage battery, by discharging and recharging commutation circuit, the charge-discharge control circuit each other that step-up/step-down circuit and single chip machine controlling circuit constitute, the described commutation circuit that discharges and recharges is by discharging and recharging transfer relay J-1, J-2, J-3, J-4 and start relay K 1 constitute, the anchor clamps positive terminal of described detection battery is connected with the start relay, the start relay is connected with the step-up/step-down circuit input end by the normally closed point of relay J-1, the common formation that the normally closed point of described relay J-2 is connected with detection battery clamp negative pole end detects the link circuit of battery, described step-up/step-down circuit output terminal is connected with the anchor clamps positive terminal of energy-storage battery by the normally closed point of relay J-4, the step-up/step-down circuit output terminal is connected the common link circuit that constitutes energy-storage battery by the normally closed point of relay J-3 with the anchor clamps negative pole end of energy-storage battery, described single chip machine controlling circuit is connected with step-up/step-down circuit and relay drive circuit.
Described step-up/step-down circuit is by insulated gate bipolar transistor, schottky diode, inductance, the BUCK-BOOST step-up/step-down circuit that electric capacity constitutes, described inductance, electric capacity is the ∏ formula with schottky diode and is connected, the emitter of described insulated gate bipolar transistor is connected with schottky diode, emitter is connected with relay K 2 again, relay K 2 normal battles connect the benefit discharge resistance, normally closed point connects inductance, the other end of inductance is connected with relay (K3), it is connected with detection battery cathode end anchor clamps through the current sensor Iin and the normally closed point of relay (J-2) of input circuit again simultaneously, and the collector of insulated gate bipolar transistor is by the normally closed point of relay (J-1), relay (K1) is connected with the anchor clamps positive terminal that detects battery; The normal battle of described relay (K3) is connected with additional electric charger, replenish electric charger and be connected with detection battery cathode end anchor clamps, the gate pole of described edge grid bipolar transistor is connected with pwm control circuit, and described inductance is connected with the anchor clamps positive terminal and the negative pole end anchor clamps of energy-storage battery respectively through current sensor Io, the normally closed point of relay (J-4) and the normally closed point of relay (J-3) of output loop.
The pwm control circuit that described edge grid bipolar transistor gate pole connects is made of saw-toothed wave generator, pulse producer, driving circuit, totalizer, amplifier, zeroing and full scale regulating circuit, described saw-toothed wave generator, pulse producer and driving circuit are connected successively, described pulse producer is connected with totalizer successively with amplifier, and described totalizer is connected with zeroing and full scale regulating circuit respectively.
Beneficial effect: because the realization of the lithium battery set detecting device that discharges and recharges each other not only can solve the energy-saving and emission-reduction problem in the detection of battery or battery set charge/discharge preferably, save electric cost in large quantities, also can improve detection throughput rate; Because the making full use of of the energy reduced the discharging of heat, also will improve influence widely to aspects such as the assurance of equipment operation, battery quality and personnel operation environment.
Description of drawings
Fig. 1 is a charging and discharging lithium battery testing circuit schematic diagram of the present invention;
Fig. 2 is a single chip machine controlling circuit schematic diagram among Fig. 1;
Fig. 3 is a PWM control principle block diagram
Fig. 4 is the pwm circuit schematic diagram;
Fig. 5 is a contour structures synoptic diagram of the present invention.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with accompanying drawing and preferred embodiment.As Fig. 1-shown in Figure 5, a kind of have a lithium battery pick-up unit that discharges and recharges function each other, mainly contain casing, place the mesuring battary on casing surface and the anchor clamps of energy-storage battery, by relay, discharge and recharge commutation circuit, step-up/step-down circuit, replenish/mend the charge-discharge control circuit each other that discharge circuit and single chip machine controlling circuit constitute, the described commutation circuit that discharges and recharges is by discharging and recharging transfer relay J-1, J-2, J-3, J-4 and start relay K 1 constitute, J-1, J-2, J-3, the normally closed point of J-4 is for detecting the discharge condition of battery, and normal the battle to detecting the charged state of battery, the anchor clamps positive terminal of described detection battery is connected with start relay K 1, start relay K 1 is connected with the step-up/step-down circuit input end by the normally closed point of relay J-1, the normally closed point of described relay J-2 is connected to form input circuit with detection battery clamp negative pole end, described step-up/step-down circuit output terminal is connected with the anchor clamps positive terminal of energy-storage battery by the normally closed point of relay J-4, the step-up/step-down circuit output terminal connects and composes output loop by the anchor clamps negative pole end of normally closed point of relay J-3 and energy-storage battery, and described single chip machine controlling circuit is connected with the pwm control circuit and the relay drive circuit JK of step-up/step-down circuit.Described step-up/step-down circuit is by insulated gate bipolar transistor IGBT, schottky diode, inductance, the BUCK-BOOST step-up/step-down circuit that electric capacity constitutes, described inductance, electric capacity is the ∏ formula with schottky diode and is connected, the collector C of described IGBT is connected with relay J-1, the emitter E of described IGBT is connected with schottky diode, and be connected with relay K 2, its normally closed some B connects inductance, the other end of inductance is connected with relay K 3, this end of inductance is connected with detection battery cathode end anchor clamps through the current sensor Iin and the normally closed point of relay J-2 of input circuit again simultaneously, constitutes the input circuit of step-up/step-down circuit; The output loop that described inductance institute reserve of electricity connects and composes step-up/step-down circuit with the anchor clamps positive terminal and the negative pole end anchor clamps of energy-storage battery respectively through current sensor Io, the normally closed point of relay J-4 and the normally closed point of relay J-3.Describedly replenish and mend the discharge road and mainly constitute and mend the road of discharging, constitute supplementary circuitry by relay K 3 normal battle of K and charger by relay K 2 normal battle of K and discharge resistance.The gate pole G of described IGBT connects pwm control circuit.Described relay (K3) is normal makes war to be connected with and replenishes electric charger, and replenish electric charger and be connected with detection battery cathode end anchor clamps,
Additional/benefit that the charge/discharge commutation circuit of being made up of J-1/J-2/J-3/J-4 relay and K1 start relay, BUCK-BOOST step-up/step-down circuit, K2 relay/discharge resistance (the R)/K3 relay/charger that IGBT/ schottky diode (D)/inductance (L)/electric capacity (C) is formed are formed discharge road and single chip machine controlling circuit.Detect the K1 start relay that the positive B1+ end of anchor clamps of battery BT1 connects, the normally closed point that discharges and recharges transfer relay by J-1 is connected to the collector C of BUCK-BOOST circuit I GBT; Its emitter E connects diode, and meets the K2 that benefit is put transfer relay, and its open circuit point K connects the benefit discharge resistance, and closed circuit some B connects inductance L; Their loop is the normally closed point that discharges and recharges transfer relay through Iin current sensor and J-2 and detect battery negative terminal anchor clamps B1-and be connected; Promptly constitute input circuit.Another road of inductance L, through the Io current sensor be connected to the J-3 of B2-end that J-4 discharges and recharges normally closed point, B2+ battery clamp and the BT2 energy-storage battery of transfer relay, transfer relay normally closed point, be connected to capacitor C 2, diode D has promptly constituted output loop.K3 is that the charger that replenishes electricity replenishes the commutation circuit relay of electricity for battery BT1 among the figure; JK in the single chip machine controlling circuit is to be total sampled voltage of BT1 detection battery to Drive and Control Circuit, VB1 that each relay switches, VB2 is total sampled voltage of BT2 energy-storage battery, VX1 is the connecting circuit that BT1 detects each shunt monomer sampled voltage of battery, VX2 is the connecting circuit of each shunt monomer sampled voltage of BT2 energy-storage battery, Iin is a BUCK-BOOST circuit input circuit current sensor, and Io is the output loop current sensor; The pulse width modulation (PWM) control circuit, then by chip microcontroller to the control of IGBT, thereby the constant current/constant voltage control when having realized that BUCK-BOOST circuit I/O two ends are detected battery BT1 and energy-storage battery BT2 charge/discharge.Insulated gate bipolar transistor IGBT (Insulated Gate Bipolar Transistor) is by the compound full-control type voltage driven type power semiconductor device that BJT (double pole triode) and MOS (insulating gate type field effect tube) form, and has the advantage of low conduction voltage drop two aspects of the high input impedance of MOSFET and GTR concurrently.Little and the saturation pressure of IGBT driving power reduces.The pwm control circuit that described edge grid bipolar transistor gate pole connects is by saw-toothed wave generator; pulse producer; driving circuit; totalizer; amplifier; zeroing and full scale regulating circuit constitute; described saw-toothed wave generator is to connect reference voltage with LM358 operational amplifier positive input terminal; anode also is connected a positive feedback resistor with output terminal; negative input end is connected a diode with output terminal by the resistance forward that is connected in series; negative terminal connects on again and connects an electric capacity under the resistance; the circuit of Gou Chenging thus; output terminal at amplifier can produce continuous sawtooth wave; described pulse producer is the positive input terminal connection control voltage with operational amplifier; negative input end connects the sawtooth wave output signal; thus according to the size of controlling voltage; just produced the pulse of distinct pulse widths at output terminal; described driving circuit is to pass through photoisolator; triode and protective resistance constitute conventional IGBT driving circuit; described totalizer is to form with operational amplifier; two additive signals are to connect zero potentiometer signal end and full scale regulator potentiometer signal end at negative input end; be output as the negative value of two signal plus after the computing; described amplifier is to pass through resistance eutral grounding with the operational amplifier anode; negative terminal is to output termination one feedback resistance; connect an input resistance again and be connected to the output terminal of totalizer; constitute sign-changing amplifier; after becoming real control voltage; be connected to the positive input terminal of pulse producer, constitute practical pwm control circuit thus.
Principle of work:
One, detects the discharge loop of battery: at first connect BT1 and detect electric battery and BT2 energy-storage battery group, when connecting start relay K 1 and discharging and recharging normally closed some B of transfer relay J-I/J-2/J-3/J-4, detect the discharge condition of battery for BT1, and the normally closed some B of K2 connects the L inductance, promptly is the buck duty of BUCK-BOOST circuit.This moment, the control through PWM can make discharge current be controlled at desired constant current state; Its principle of work is: when the pulse enable signal IGBT of PWM opened, the electric current inductance of flowing through from top to bottom formed the loop by the Iin sensor, this moment the inductance upper end for just, the lower end is for bearing; When PWM turn-offed IGBT, inductance was the last electric energy of just bearing and emitting with reverse; These electric energy are by after the C2 filtering, again through J-4 to energy-storage battery BT2 charging, and form the discharge loop of inductance by J-3 and diode D, also formed the charge circuit of energy-storage battery simultaneously; This has just realized detecting the energy storage purpose of the electric energy transfer of battery BT1 to energy-storage battery.When detecting that battery BT1 has not been put electricity and under the situation that energy-storage battery BT2 has been full of, K2 can be switched to normal battle of K, connect discharge resistance R, the BT1 discharge energy became heat energy through resistance and made it mend to discharge and finish discharge process this moment.Single-chip microcomputer passes through the control of the sampling of Iin and PWM, forms the closed-loop control to the discharge constant current/constant voltage.
Two, detect the charge circuit of battery: switch to normal battle of K simultaneously, become the charged state that detects battery BT1 when discharging and recharging transfer relay J-1/J-2/J-3/J-4, at this moment the B2+ of energy-storage battery BT2 is switched to the IGBT input end by J-1, and the negative pole of BUCK-BOOST input circuit is connected with B2-by J-4, has promptly formed the discharge loop of energy-storage battery; At this moment the output loop positive pole of BUCK-BOOST circuit, be connected to the anode anchor clamps B1+ that detects battery BT1 by J-2, and negative terminal B1-has received diode D through J-3, has formed detecting the charge circuit of battery BT1; The energy-storage battery discharge loop stores the electric flux in the inductance L into like this, has formed detecting the charging process of battery BT1; But when BT1 does not charge electricity and BT2 has reached under the situation of discharge lower limit, Single-chip Controlling K3 switches to normal battle of K, connects the charger that replenishes electricity, and this moment, BT1 continued charging, and then finishes charging process to BT1 with supplementary circuitry.
Wherein the principle of work of BUCK-BOOST step-up/step-down circuit is Uo=K/ (1-K) Ui; Key is to adjust the ratio of the size of dutycycle K value with regard to may command output/input, and because of pulse width modulation circuit PWM is the effective ways that dutycycle is adjusted, promptly PWM control just can realize by IGBT being carried out effectively.
Described each actuating of relay is finished under single-chip microcomputer is controlled by relay drive circuit JK.The control that discharges and recharges constant current mainly is that the constant current controlling unit that single-chip microcomputer passes through the negative feedback PWM closed loop that the Iin current sampling signal constitutes realizes, constant voltage control is that the constant voltage controlling unit that single-chip microcomputer passes through the negative feedback charging PWM closed loop that VB1 total voltage signal constitutes realizes.Wherein the VX1/VX2/VB2/Io signal is the security monitoring to two battery operation states, in case exceed the damage that limit value causes battery.
Three, experimentation: from 2006 we begin to have designed some simple testing tools; As: simple and easy porcelain tube resistance-type Electrical Discharge Machine, charger detector, balance-type protection management board;
(1) main circuit that begins to determine is a reduction voltage circuit, at first for satisfying the requirement of voltage and current, selects qualified high-power switch tube; Through tens times experiments, screening, determined IGBT with " 40N60 " model.But after buying the hundreds of sheet for the second time, burnt out more than totally two hundred IGBT in succession; When finding the same but quality of first both two batches of model out of question not simultaneously, just select else to decide both 48N60 of producer and model.
(2) in order to adapt to the requirement of dynamic control circuit, must carry out shaping to the battery-end after the copped wave handles, and be applicable to that again the electric battery that detects different electric current and voltages had both adapted to the needs of load on a large scale, so the definite of the big inductance in the circuit, big electric capacity also goes through again and again, front and back have tens times experiment just to obtain comparatively ideal waveform.
(3) determining of PWM Drive and Control Circuit, constantly perfect in experiment fully.Begin us and select the prior PWM chip for use, there all do not have after the experiment to be suitable; So we use instead from the circuit of taking, some problems such as feedback accuracy that control at zero point, full scale control, ground connection interference, waveform adjustment, frequency setting, PID control have been solved; Selecting for use of the adjustment of circuit and experiment and components and parts all passed through many times repeatedly for this reason, and light changes to be PCB and just to reach tens editions.
(4) both discharging and recharging the commutation circuit of configuration also is constantly to pinpoint the problems in tens times debugging and improve perfectly, has determined that at last high power relay adds the scheme of crowbar circuit.
(5) treat main circuit success after, for testing energy-conservation testing circuit, comprise that IGBT, electric capacity even experiment all have in various degree damage with power supply etc., passed through many time of half a year successively, until finding the device Success in Experiment progressively just that is suitable for this circuit.
(6) at last according to design and experimental result, this energy-conservation testing circuit is formed by discharging and recharging commutation circuit, buck main circuit, additional/discharge road and four essential parts of single chip machine controlling circuit.
Four, experiment for example
(1) points for attention
● the switching tube of main circuit can be used MOSFET, IGBT, but the parasitic backward dioded of all unavailable band;
● the diode of main circuit preferably adopts schottky diode;
● the PWM driving circuit begins the also available existing chip of experiment, but driving circuit voltage can not be less than 12V
(2) test objective:, realize having the electric current that discharges and recharges to change qualitatively along with the size of control to two same electric battery, by the control of this step-up/step-down circuit.
(3) test procedure
● the position that peripheral commutation circuit is connected with normally closed point among the figure connects main circuit, but battery does not insert earlier;
● whether examination Single-chip Controlling and PWM driving circuit waveform be intact, and can reach the duty cycle adjustment scope of 10-90% at least;
● PWM transfers to 1HZ, surveys with multimeter resistance break-make shelves that IGBT pipe C, E two ends, positive test pencil connect the C end, negative test pencil connects the E end, observes whether break-make is normal;
● frequency transfers to about 20KHZ, and PWM is transferred to minimum;
● insert and detect battery, regulate PWM, make the rise and fall of main circuit output voltage along with adjusting; Notice that input is opposite with the voltage direction of output;
● insert energy-storage battery, along with the adjusting of PWM, after output voltage surpasses energy-storage battery voltage, input current and and then changing; To this is normal to the main circuit test.
The above only is preferred embodiment of the present invention, is not structure of the present invention is done any pro forma restriction.Every foundation technical spirit of the present invention all still belongs in the scope of technical scheme of the present invention any simple modification, equivalent variations and modification that above embodiment did.
Claims (3)
1. one kind has the lithium battery pick-up unit that discharges and recharges function each other, it is characterized in that: mainly contain casing, place the mesuring battary on casing surface and the anchor clamps of energy-storage battery, by relay, discharge and recharge commutation circuit, the charge-discharge control circuit each other that step-up/step-down circuit and single chip machine controlling circuit constitute, the described commutation circuit that discharges and recharges is by discharging and recharging transfer relay (J-1), (J-2), (J-3), (J-4) and start relay (K1) constitute, the anchor clamps positive terminal of described detection battery is connected with the start relay, the start relay is connected with the step-up/step-down circuit input end by the normally closed point of relay (J-1), the common formation that the normally closed point of described relay (J-2) is connected with detection battery clamp negative pole end detects the link circuit of battery, described step-up/step-down circuit output terminal is connected with the anchor clamps positive terminal of energy-storage battery by the normally closed point of relay (J-4), the step-up/step-down circuit output terminal is connected the common link circuit that constitutes energy-storage battery by the normally closed point of relay (J-3) with the anchor clamps negative pole end of energy-storage battery, described single chip machine controlling circuit is connected with step-up/step-down circuit and relay drive circuit.
2. according to claim 1 have a lithium battery pick-up unit that discharges and recharges function each other, it is characterized in that: described step-up/step-down circuit is by insulated gate bipolar transistor, schottky diode, inductance, the BUCK-BOOST step-up/step-down circuit that electric capacity constitutes, described inductance, electric capacity is the ∏ formula with schottky diode and is connected, the emitter of described insulated gate bipolar transistor is connected with schottky diode, emitter is connected with relay (K2) again, the normal battle of relay (K2) connects the benefit discharge resistance, normally closed point connects inductance, the other end of inductance is connected with relay (K3), it is connected with detection battery cathode end anchor clamps through the current sensor Iin and the normally closed point of relay (J-2) of input circuit again simultaneously, and the collector of insulated gate bipolar transistor is by the normally closed point of relay (J-1), relay (K1) is connected with the anchor clamps positive terminal that detects battery; The normal battle of described relay (K3) is connected with additional electric charger, replenish electric charger and be connected with detection battery cathode end anchor clamps, the gate pole of described edge grid bipolar transistor is connected with pwm control circuit, and described inductance is connected with the anchor clamps positive terminal and the negative pole end anchor clamps of energy-storage battery respectively through current sensor Io, the normally closed point of relay (J-4) and the normally closed point of relay (J-3) of output loop.
3. according to claim 1 and 2 have a lithium battery pick-up unit that discharges and recharges function each other, it is characterized in that: the pwm control circuit that described edge grid bipolar transistor gate pole connects is made of saw-toothed wave generator, pulse producer, driving circuit, totalizer, amplifier, zeroing and full scale regulating circuit, described saw-toothed wave generator, pulse producer and driving circuit are connected successively, described pulse producer is connected with totalizer successively with amplifier, and described totalizer is connected with zeroing and full scale regulating circuit respectively.
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| CN103823190A (en) * | 2014-03-11 | 2014-05-28 | 淄博洁力电气设备有限公司 | Comprehensive parameter testing device for large-capacity power battery and testing method of comprehensive parameter testing device |
| CN104199328A (en) * | 2014-08-26 | 2014-12-10 | 国网上海市电力公司 | Current switching device for detecting life of sodium-sulphur battery electrolyte ceramic tube |
| CN104199328B (en) * | 2014-08-26 | 2017-05-10 | 国网上海市电力公司 | Current switching device for detecting life of sodium-sulphur battery electrolyte ceramic tube |
| CN104377402A (en) * | 2014-12-02 | 2015-02-25 | 天津航空机电有限公司 | Control and fault diagnosing system of battery heater |
| CN109075603A (en) * | 2016-05-12 | 2018-12-21 | 西门子股份公司 | Determine the capacity of the accumulator of the DC power supply unit without interruption |
| CN106153200A (en) * | 2016-08-05 | 2016-11-23 | 哈尔滨威克科技有限公司 | Portable blackbody demarcation instrument |
| CN106153200B (en) * | 2016-08-05 | 2023-05-26 | 哈尔滨国铁科技集团股份有限公司 | Portable blackbody calibrator |
| CN107238807A (en) * | 2017-08-02 | 2017-10-10 | 东华理工大学 | A kind of intelligent electric power parameter detection device |
| CN108551189A (en) * | 2018-05-14 | 2018-09-18 | 广东电网有限责任公司电力科学研究院 | A kind of transformer station direct current system holds method and device from kinetonucleus |
| CN108551189B (en) * | 2018-05-14 | 2021-03-12 | 广东电网有限责任公司电力科学研究院 | Automatic capacity checking method and device for direct current system of transformer substation |
| CN114204802A (en) * | 2021-11-17 | 2022-03-18 | 深圳技术大学 | Charging circuit |
| CN114204802B (en) * | 2021-11-17 | 2023-05-16 | 深圳技术大学 | Charging circuit |
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