CN202840651U - Parallel current sharing circuit of charging module of electric automobile charger - Google Patents
Parallel current sharing circuit of charging module of electric automobile charger Download PDFInfo
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- CN202840651U CN202840651U CN 201220229725 CN201220229725U CN202840651U CN 202840651 U CN202840651 U CN 202840651U CN 201220229725 CN201220229725 CN 201220229725 CN 201220229725 U CN201220229725 U CN 201220229725U CN 202840651 U CN202840651 U CN 202840651U
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Abstract
The utility model provides a parallel current sharing circuit of a charging module of an electric automobile charger, comprising a charger monitoring unit and at least one charging module which are connected in parallel, wherein the charging modules are linked in parallel; the charger monitoring unit is connected with the charging modules through signal lines; and the charging modules are connected with a grid alternating current end and a power battery direct current end of the electric automobile respectively. By using the current sharing circuit disclosed by the utility model, the sampling feedback coefficient of the output voltage of the module is adjusted according to the differential value between a module charging current sampling signal and average current signals of all the parallel modules, thus the charging voltage and the charging current of the module are further adjusted to reach the purpose of load-sharing current in parallel of every charging module. The parallel current sharing circuit has relatively high current sharing precision and current sharing dynamic responding speed, is beneficial to improving the reliability and the maintainable performance of the charger and better satisfies the charging requirement of the power battery of the electric automobile.
Description
Technical field
The utility model relates to the electric automobile field, is specifically related to a kind of parallel current-equalizing circuit of electric automobile battery charger charging module.
Background technology
Electric automobile is as a kind of new traffic tool; has incomparable advantage at aspects such as alleviating energy crisis, promotion environment and human harmonious development; it is the effective carrier that advances transport development mode to change; represented the trend of future automobile development, and the electrically-charging equipment construction such as electric automobile charging station are prerequisite and basis that ev industry develops in a healthy way.Typical electric automobile charging station mainly comprises other auxiliary equipment such as electric power system, charging system, supervisory control system and civil engineering.Wherein, the charging station charging system mainly comprises alternating-current charging pile and non-Vehicular charger, is the nucleus equipment of charging station.
Electric automobile battery charger (being non-Vehicular charger) refers to and a kind ofly is installed in that electric automobile is external, AC energy is transformed to direct current energy and adopts conduction pattern is the isolated plant of electric powered motor charge in batteries.At present, non-Vehicular charger mainly contains phase control rectifier and two kinds of technical schemes of HF switch rectification.Along with the development of power electronic technology, the phase control type charger is owing to exist the shortcomings such as efficient is low, large to the mains by harmonics interference, maintenance is inconvenient to be replaced by the high frequency switch type charger gradually.In order to satisfy the especially charging demand of electric commercial vehicle electrokinetic cell high-voltage great-current of present electric automobile, and consider the performance index such as reliability and maintainability of charger, the high frequency switch type charger is general at present adopts a plurality of HF switch charging modules to compose in parallel.When a plurality of identical charging module parallel running, because the parameter of each charging module can't be accomplished in full accord, the charging current that causes each module to be shared differs, and this can have a strong impact on the reliability of whole charger and the stability of operation, therefore must take corresponding current-sharing measure.At present, current-sharing control method commonly used mainly contains following several:
(1) output impedance method.This method is mainly by regulating the external characteristic gradient (being the regulation output impedance) of each charged in parallel module, to reach the purpose of parallel module load-sharing electric current.This method is fairly simple, and major defect is that the current-sharing precision is low, and voltage regulation rises.
(2) principal and subordinate arranges method: this method is applicable in the paralleling switch power-supply system of current-mode control.Primary module is taked the two closed-loop controls of voltage and current, only has current closed-loop control from module, the given value of current signal realization current-sharing that all produce by following primary module from module.The shortcoming of this method is that the primary module whole system that lost efficacy then can not be worked, and reliability is not high.
(3) by the average current value automatic current equalizing method.This method can accurately realize current-sharing, is short-circuited but work as bus, and when perhaps a power supply on bus can not be worked, busbar voltage descended, and will make each supply voltage downward modulation, even arrive its lower limit, causes fault.
(4) maximum current automatic current equalizing method.This current-sharing control method effect is better, and shortcoming is that principal and subordinate's module always is in the continuous switching, can cause the output current of modules to produce low-frequency oscillation; And since respectively from module all take maximum current as regulating purpose, will inevitably make the parallel system output voltage be higher than rated voltage, produce overvoltage, and the larger overvoltage phenomenon of the output impedance of power supply is more obvious.
Have the shortcoming and defect of current sharing control method now, limited the overall performance of electric automobile battery charger charging module parallel running, the Industry Promotion that has affected electric automobile battery charger is used.
The utility model content
For the deficiencies in the prior art, the utility model provides a kind of parallel current-equalizing circuit of electric automobile battery charger charging module, has improved the utilance of charging module, has realized that the current-sharing precision is high, the advantages such as rapid dynamic response speed.
The parallel current-equalizing circuit of a kind of electric automobile battery charger charging module that the utility model provides comprises charger monitoring unit formation in parallel with at least one charging module; In parallel between the charging module; Its improvements are that described charger monitoring unit is connected with charging module; Connect between the described charging module; Described charging module exchanges end with electrical network respectively and is connected with the electric automobile power battery dc terminal.
Wherein, described charging module comprises power transforming main circuit, current sampling circuit, voltage sampling circuit, equal current relay, flow equalizing circuit, current controller, voltage controller, CPU, communication equipment, PWM generative circuit and drive circuit;
Described current controller is connected with described current sampling circuit collection, described CPU and the PWM generative circuit of being connected respectively, consists of the current closed-loop feedback circuit; Described voltage controller is connected with described flow equalizing circuit, described voltage sampling circuit, described CPU and the PWM generative circuit of being connected respectively, consists of the voltage close loop feedback circuit; Described PWM generative circuit is connected with described power transforming main circuit by described drive circuit;
Described power transforming main circuit is connected with electric automobile power battery; Connect between described power transforming main circuit and the described electric automobile power battery current sampling circuit is set, be arranged in parallel voltage sampling circuit;
Described CPU is connected with described communication equipment, man-machine interface and the equal current relay of being connected respectively.
Wherein, described flow equalizing circuit comprises resistance R 1 ~ R10, CBB capacitor C 1 ~ C4, operational amplifier U1, U2 and photoelectrical coupler U3;
The output of described current sampling circuit is connected with resistance R through the resistance R 1 of series connection and is connected with the in the same way input of described operational amplifier U1; The reverse input end of described operational amplifier U1 is connected with its output; The output of described operational amplifier U1 is connected with the reverse input end of described operational amplifier U2 by resistance R 4, and the resistance R 5 that the output of described operational amplifier U1 passes through to connect is connected with resistance R and is connected with the in the same way input of described operational amplifier U2; The output of described operational amplifier U2 is by resistance R 7 and resistance R 8 ground connection of series connection; The common port that resistance R 7 is connected with resistance R is connected with high level by resistance R 9; Described CBB capacitor C 4 one ends are connected other end ground connection with described voltage controller by described resistance R 10; Described photoelectrical coupler U3 is connected in parallel between described resistance R 8 and the described CBB capacitor C 4;
Described resistance R 2 and branch road of described CBB capacitor C 1 formation in parallel, its branch road one end ground connection, the other end is connected between described resistance R 1 and the resistance R 3;
In parallel with described CBB capacitor C 3 and described operational amplifier U2 after described CBB capacitor C 2 and resistance R 7 series connection.
Wherein, described current-sharing relay comprises resistance R 14 ~ R18, CBB capacitor C 7 ~ C9, triode Q1, Q2, diode D1, operational amplifier U4 and relay U5;
Control signal end S1 is connected with described triode Q1 base stage by described resistance R 16; Described triode Q1 grounded emitter; Described CBB capacitor C 8 is connected in parallel between described triode Q1 base stage and the emitter;
Control signal end S2 is connected with described operational amplifier U4 reverse input end; Described operational amplifier U4 in the same way input connects+5V voltage by resistance R 14; Described resistance R 15 and described CBB capacitor C 6 be in parallel to consist of a branch road, its branch road one end ground connection, and the other end is connected to described resistance R 14 and operational amplifier U4 in the same way between the input; Described operational amplifier U4 output is connected with described triode Q2 base stage by resistance R 18; Described CBB capacitor C 9 is connected in parallel between described triode Q2 base stage and the emitter; Described triode Q2 collector electrode connects high level by diode D1; Described relay U5 is in parallel with described diode D1;
Described operational amplifier U4 output is connected with described triode Q1 collector electrode;
Described CBB capacitor C 7 one ends are connected other end ground connection with control signal end S2.
Wherein, described voltage sampling circuit comprises resistance R 11 ~ R13 and CBB capacitor C 5; After described resistance R 11 and resistance R 12 series connection, an end is connected with described power transforming main circuit, and the other end is connected with described voltage controller; Described resistance R 13 and branch road of described CBB capacitor C 5 formations in parallel, its branch road one end ground connection, the other end is connected between described resistance R 12 and the described voltage controller.
Wherein, described power transforming main circuit comprises three-phase rectifier, LC filter I, high-frequency inverter, high frequency transformer, hf rectifier and the LC filter II of successively series connection.
Wherein, described voltage controller comprises resistance R 19 ~ R23, CBB capacitor C 10 ~ C12 and operational amplifier U6; Described flow equalizing circuit output is connected with described operational amplifier U6 reverse input end by resistance R 19, described CPU output pass through resistance R 20 and described operational amplifier U6 in the same way input be connected; Described operational amplifier U6 output is connected with described PWM generative circuit by resistance R 23; Described resistance R 21 and described CBB capacitor C 10 be in parallel to consist of a branch road, its branch road one end ground connection, and the other end is connected to described resistance R 20 and operational amplifier U6 in the same way between the input;
In parallel with described CBB capacitor C 12 and described operational amplifier U6 after described CBB capacitor C 11 and resistance R 22 series connection.
Wherein, described current controller comprises resistance R 24 ~ R27, CBB capacitor C 13 ~ C15 diode D2 and operational amplifier U7; Described current sampling circuit output is connected with described operational amplifier U7 reverse input end by resistance R 24, described CPU output pass through resistance R 25 and described operational amplifier U7 in the same way input be connected; Described operational amplifier U7 output is connected with resistance R and is connected with described PWM generative circuit by the diode D2 of series connection; Described CBB capacitor C 15 1 ends are connected to described resistance R 25 and operational amplifier U7 in the same way between the input, other end ground connection;
In parallel with described CBB capacitor C 13 and described operational amplifier U7 after described CBB capacitor C 13 and resistance R 26 series connection.
Wherein, described operational amplifier U6 comprises operational amplifier LM358 exclusive disjunction amplifier LF353.
Wherein, described operational amplifier U7 comprises operational amplifier LM358 exclusive disjunction amplifier LF353.
Wherein, the PWM generative circuit comprises that model is UC3875 current/voltage phase-shifting full-bridge PWM controller.
Compared with the prior art, the beneficial effects of the utility model are:
1, the utility model flow equalizing circuit is comprised of two operational amplifiers, a common optical coupler and a small amount of components and parts such as resistance capacitance, and circuit structure is simple, and the current-sharing parameter can regulate and arrange according to actual needs easily.The current-sharing precision is high, rapid dynamic response speed, and nonuniform fluid is less than 2%.
2, the utility model realizes that by the given signal of output voltage of regulating parallel module the charging current adjusting is different from traditional current-sharing control method, the output regulating and controlling signal of flow equalizing circuit is connected to the output voltage sampling feedback circuit of charging module in the utility model, realizes the charging current of each charging module is regulated by dynamic adjustment charging module output voltage feedback parameter; Simultaneously, open constantly so that flow equalizing circuit is just put into parallel system after the charging module output voltage is set up fully the defective that can avoid traditional flow equalizing circuit to cause easily the parallel system output voltage to raise by what control equal current relay.
3, the equal current relay of the utility model only sends when opening signal and charging module fault-free just open-mindedly at charging module control CPU, and flow equalizing circuit is just put into parallel system thereafter.During the operational blocks which partition system fault, this module main circuit quits work automatically, all current relay automatic disconnections, and this module withdraws from parallel system automatically, and the module of all the other normal operations is charging electric vehicle automatically.
4, redundant parallel between each charging module of charger, without master-slave, the performance index of whole charger are not less than the performance index of single charging module, have higher reliability and maintainability energy.
Description of drawings
The electric automobile battery charger theory diagram that Fig. 1 provides for the utility model.
The charger charging module structured flowchart that Fig. 2 provides for the utility model.
The charging module power transforming main circuit theory diagram that Fig. 3 provides for the utility model.
The sampling of charging module output voltage and flow equalizing circuit schematic diagram that Fig. 4 provides for the utility model.
Equal current relay and control circuit schematic diagram thereof that Fig. 5 provides for the utility model.
Charging module electric current and voltage controller and PWM generative circuit implementation that Fig. 6 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Its block diagram of parallel current-equalizing circuit of a kind of electric automobile battery charger charging module of present embodiment comprises charger monitoring unit formation in parallel with at least one charging module as shown in Figure 1; In parallel between the charging module; The charger monitoring unit is connected with charging module by the signal of communication line; Connect by the average current signal line between the described charging module; Described charging module exchanges end with electrical network respectively and is connected with the electric automobile power battery dc terminal.The monitoring unit major function is: collect the related data of each charging module and upload to charging station monitoring system on the one hand; Receive on the other hand and carry out the dependent instruction of charging station monitoring system and electric automobile power battery management system (BMS), operating state and the charging process of charger are carried out control and management.
Its structure chart of charging module comprises power transforming main circuit, current sampling circuit, voltage sampling circuit, equal current relay, flow equalizing circuit, current controller, voltage controller, CPU, communication equipment, PWM generative circuit and drive circuit as shown in Figure 2.The given value of current value that current controller provides according to power transforming main circuit output end current value and the CPU of current sampling circuit collection (being set by user or electric automobile power battery management system) is carried out the current closed-loop FEEDBACK CONTROL; The power transforming main circuit output end voltage value of the magnitude of voltage that voltage controller provides according to flow equalizing circuit, voltage sampling circuit collection and the voltage given value that CPU provides (being set by user or electric automobile power battery management system) are carried out the voltage close loop FEEDBACK CONTROL; Control loop automatically switches to voltage close loop during constant voltage charge, charging module output constant voltage; Control loop automatically switches to current closed-loop during constant current charge, charging module output constant current.The output signal of current controller and the output signal of voltage controller are passed to and are passed to power transforming main circuit by drive circuit after described PWM generative circuit is modulated; Power transforming main circuit is connected with electric automobile power battery.
Among Fig. 2, man-machine interface is the interactive interface between charging module attended operation personnel and the charging module, be used for to show the relevant informations such as the operating state of charging module and running parameter, and provide the correlation functions such as charging module control calibration, Measurement and calibration and manual operation for charger attended operation personnel; Communication equipment comprises the two parts of communicating by letter between charging module CPU and charger monitoring unit and charging module CPU and the man-machine interface, is used for finishing between charging module and the charger monitoring unit and the communication function of charging module CPU and man-machine interface inside; CPU is the control and management center of whole charging module.On the one hand, the charge parameters such as the charging voltage that CPU issues by communication equipment reception charger monitoring unit, charging current provide the given signal of charging module charging voltage and the given signal of charging current, and carry out the instructions such as charging, shutdown; Simultaneously, CPU gathers the actual charging voltage of charging module, charging current and other related work state informations of charging module by sample circuit, and information is uploaded to the charger monitoring unit.
The power transforming main circuit block diagram comprises three-phase rectifier, LC filter I, high-frequency inverter, high frequency transformer, hf rectifier and the LC filter II of successively series connection as shown in Figure 3.As shown in the figure, the three-phase and four-line alternating current of input obtains Rectified alternating current after the three-phase rectifier rectification, filtering obtains the very little direct current of alternating current component through the LC filter smoothing again, this direct current is transformed into the high frequency square wave alternating voltage through behind the high-frequency inversion, then through obtaining high-quality direct current energy to electric automobile power battery charging after the isolation of high frequency transformer transformation, hf rectifier rectification and the LC filtering.The power transforming main circuit of charging module can also adopt existing various direct-current switch power supply circuit, as recommend, phase-shifting full-bridge and series resonance etc.
The flow equalizing circuit structure chart as shown in Figure 4, its with the output signal of described current sampling circuit output signal and described equal current relay as input signal, after carrying out the difference computing, through operation amplifier and isolation, with the input signal of its output signal as described voltage controller.Flow equalizing circuit comprises resistance R 1～R10, CBB capacitor C 1～C4, operational amplifier U1, U2 and photoelectrical coupler U3; After the described current sampling circuit sampled signal Iof1 dividing potential drop, its output is connected with resistance R through the resistance R 1 of series connection and is connected with the in the same way input of described operational amplifier U1; The reverse input end of described operational amplifier U1 is connected with its output; The output of described operational amplifier U1 is connected with the reverse input end of described operational amplifier U2 by resistance R 4, and the resistance R 5 that the output of described operational amplifier U1 passes through to connect is connected with resistance R and is connected with the in the same way input of described operational amplifier U2; After the difference process proportional integral computing of operational amplifier U2 with equalizing controller output signal Iav1 and Iof1, its output is by resistance R 7 and resistance R 8 ground connection of series connection; The common port that resistance R 7 is connected with resistance R is connected with high level by resistance R 9; Described CBB capacitor C 4 one ends are connected other end ground connection with described voltage controller by described resistance R 10; Described photoelectrical coupler U3 is connected in parallel between described resistance R 8 and the described CBB capacitor C 4, resistance R 8 earth terminals link to each other with the negative electrode of the former limit light-emitting diode of photoelectrical coupler U3, and the other end of resistance R 8 links to each other with the anode of the former limit light-emitting diode of photoelectrical coupler U3; The secondary transistor collector voltage of photoelectrical coupler U3 (charging module output voltage conditioning signal) Uad1 is connected to output voltage sampled signal Uof1 by resistance R 10, the grounded emitter of the secondary triode of U3.Resistance R 2 and branch road of described CBB capacitor C 1 formation in parallel, its branch road one end ground connection, the other end is connected between described resistance R 1 and the resistance R 3; In parallel with described CBB capacitor C 3 and described operational amplifier U2 after CBB capacitor C 2 and resistance R 7 series connection.The operation principle of flow equalizing circuit is: in the situation that the equal current relay of all charging modules is all opened, short and the resolution according to the void of operational amplifier U1 and U2, resistance R 5 resistances of supposing all charging modules are identical, the charging current sampled signal of N charging module is respectively Iof1, Iof2 ... IofN, easily try to achieve:
Therefore, Iav1 has represented the mean value of each parallel module charging current sampled signal.
All its circuit diagram of current relay as shown in Figure 5, comprise control signal end S1 and control signal end S2, the control signal of control signal end S1 is from module CPU, CPU can be according to module self operating state, provide equal current relay and open signal (S1 output low level) when the module output voltage is normal, S1 exports high level and disconnects equal current relay through control circuit when the module output voltage is unusual; The control signal of control signal end S2 provides equal current relay and opens signal (S2 output low level) from module total failare signal when the module fault-free, S2 exports high level and disconnects equal current relay through control circuit in case charging module breaks down.The current-sharing relay comprises resistance R 14 ~ R18, CBB capacitor C 7 ~ C9, triode Q1, Q2, diode D1, operational amplifier U4 and relay U5; Control signal end S1 is connected with described triode Q1 base stage by described resistance R 16; Described triode Q1 grounded emitter; Described CBB capacitor C 8 is connected in parallel between described triode Q1 base stage and the emitter; Control signal end S2 is connected with described operational amplifier U4 reverse input end; Described operational amplifier U4 in the same way input connects+5V voltage by resistance R 14; Described resistance R 15) and described CBB capacitor C 6 is in parallel consists of a branch road, its branch road one end ground connection, the other end is connected to described resistance R 14 and operational amplifier U4 in the same way between the input; Described operational amplifier U4 output is connected with described triode Q2 base stage by resistance R 18; Described CBB capacitor C 9 is connected in parallel between described triode Q2 base stage and the emitter; Described triode Q2 collector electrode connects high level by diode D1; Described relay U5 is in parallel with described diode D1; Operational amplifier U4 output is connected with triode Q1 collector electrode; CBB capacitor C 7 one ends are connected other end ground connection with control signal end S2.Wherein, all current relay can adopt the signal relay of the various models such as the TX of Panasonic, TN, and Q1 and Q2 can adopt the transistors commonly used such as S8050, and U4 can adopt the voltage comparators such as LM311.
Voltage sampling circuit adopts resistance series connection dividing potential drop mode, comprises resistance R 11 ~ R13 and CBB capacitor C 5; After described resistance R 11 and resistance R 12 series connection, an end is connected with described power transforming main circuit, and the other end is connected with described voltage controller; Described resistance R 13 and branch road of described CBB capacitor C 5 formations in parallel, its branch road one end ground connection, the other end is connected between described resistance R 12 and the described voltage controller.
Current sampling circuit can be made of various types of current sensors such as Halls, also can adopt the series resistance sample mode.
Voltage controller comprises resistance R 19 ~ R23, CBB capacitor C 10 ~ C12 and operational amplifier U6 as shown in Figure 6; Described flow equalizing circuit output is connected with described operational amplifier U6 reverse input end by resistance R 19, described CPU output pass through resistance R 20 and described operational amplifier U6 in the same way input be connected; Described operational amplifier U6 output is connected with described PWM generative circuit by resistance R 23; Described resistance R 21 and described CBB capacitor C 10 be in parallel to consist of a branch road, its branch road one end ground connection, and the other end is connected to described resistance R 20 and operational amplifier U6 in the same way between the input; In parallel with described CBB capacitor C 12 and described operational amplifier U6 after CBB capacitor C 11 and resistance R 22 series connection.
Current controller comprises resistance R 24 ~ R27, CBB capacitor C 13 ~ C15 diode D2 and operational amplifier U7 as shown in Figure 6; Described current sampling circuit output is connected with described operational amplifier U7 reverse input end by resistance R 24, described CPU output pass through resistance R 25 and described operational amplifier U7 in the same way input be connected; Described operational amplifier U7 output is connected with resistance R and is connected with described PWM generative circuit by the diode D2 of series connection; Described CBB capacitor C 15 1 ends are connected to described resistance R 25 and operational amplifier U7 in the same way between the input, other end ground connection; In parallel with CBB capacitor C 13 and operational amplifier U7 after CBB capacitor C 13 and resistance R 26 series connection.
Central processor CPU can adopt digital signal processor (DSP), single-chip microcomputer, ARM etc. to have device and the device of Digital Signal Processing, calculation function.
Concrete, referring to Fig. 4, take first module as example, suppose for a certain reason so that the charging current sampled signal Iof1 of module 1 greater than all parallel module average current signal Iav1, analyze as can be known because the proportional-plus-integral action of operational amplifier U2, the output voltage of U2 reduces, and then cause node voltage Ux lower voltage, the former limit light-emitting diode light intensity of photoelectrical coupler U3 weakens, the secondary transistor collector electric current of photoelectrical coupler U3 reduces, module output voltage equivalence feedback factor increases, this moment, the effect lower module charging voltage reduction charging current at the voltage and current closed control circuit of module reduced, until Iof1 equates with Iav1, thereby realize the purpose of each parallel module load-sharing electric current.The same analysis as can be known, in case for a certain reason so that the charging current sampled signal Iof1 of module 1 less than average current signal Iav1, the voltage of Ux can raise, the collector current of photoelectrical coupler U3 secondary triode increases, effect lower module charging current at charging module voltage and current closed control circuit increases, thereby until Iof1 equates to realize parallel current-sharing with Iav1.
Fig. 5 has provided the equal current relay of the utility model and control circuit schematic diagram thereof.Analyzing as can be known, be low level (namely only at the module output voltage normally and during fault-free) at S1 and S2 simultaneously only, and Q2 just understands conducting so that the current-sharing relay closes.As long as it is unusual or module breaks down so that S1 or S2 become high level the module output voltage to occur, will inevitably cause Uc voltage is zero, the Q2 cut-off; all current relay disconnects; malfunctioning module withdraws from parallel system, prevents that fault from enlarging, thereby improves the reliability of parallel system.
Fig. 6 has provided a kind of based on the charging module electric current and voltage closed loop controller of phase-shifting full-bridge control technology and the typical implementation of PWM generative circuit.Wherein, U6 and U7 can adopt the common operational amplifiers such as LM358, LF353, UC3875 is a kind of high-performance current of producing of American TI Company/voltage phase shift full bridge PWM controller, Uof1 and Uref1 are respectively module charging voltage sampled signal and the given signal of charging voltage, Iof1 and Iref1 are respectively module charging current sampled signal and the given signal of charging current, and S2 is module total failare signal.Wherein the Uof1 signal is connected to the output of flow equalizing circuit on the one hand, is used for current-sharing and regulates, and is connected on the other hand voltage controller, is used for the charging module output voltage control.When the charging module constant voltage of present embodiment was worked, operational amplifier U7 was in positive saturation condition in the current closed-loop controller, and the voltage close loop controller is in linear working state, diode D2 cut-off, the charging voltage of module stable output; During charging module constant current work, operational amplifier U6 is in positive saturation condition in the voltage close loop controller, and the current closed-loop controller is in linear working state, the automatic conducting of diode D2, the charging current that control module output is constant.Vipid is that voltage controller (PID control) and the current controller (PID control) of charging module exported the signal that obtains after the processing, it is input to the in the same way input E/A+ end of PWM controller, and the OUTA～OUTD of PWM controller can have according to the level output of Vipid the PWM waveform of different phase shifting angles.This waveform is input in the power transforming main circuit by drive circuit.
Overall flow of the present utility model is: charging voltage and charging current information that charging module CPU issues according to the charger monitoring unit, provide charging module voltage given signal and given value of current signal, the module voltage controller carries out the PID adjusting to voltage given signal and charging voltage sampled signal, it is Vipid that the blocks current controller carries out obtaining total PID signal after PID regulates to given value of current signal and current sampling signal, UC3875 is according to the different pwm pulses with phase shifting angle of size output of Vipid, this pulse signal is through isolation, power switch pipe behind the drive amplification in the control charging module power conversion principal current is realized the adjusting to charging module charging voltage and charging current.The utlity model has higher current-sharing precision and current-sharing dynamic responding speed, be conducive to improve the reliability and maintainability energy of charger, can better meet the charging demand of electric automobile power battery.
Should be noted that at last: above embodiment is only in order to illustrate that the technical solution of the utility model is not intended to limit, although with reference to above-described embodiment the utility model is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement embodiment of the present utility model, and do not break away from any modification of the utility model spirit and scope or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (11)
1. the parallel current-equalizing circuit of an electric automobile battery charger charging module comprises charger monitoring unit formation in parallel with the charging module of at least one; In parallel between the charging module; It is characterized in that described charger monitoring unit is connected with charging module; Connect between the described charging module; Described charging module exchanges end with electrical network respectively and is connected with the electric automobile power battery dc terminal.
2. parallel current-equalizing circuit as claimed in claim 1, it is characterized in that described charging module comprises power transforming main circuit, current sampling circuit, voltage sampling circuit, equal current relay, flow equalizing circuit, current controller, voltage controller, CPU, communication equipment, PWM generative circuit and drive circuit;
Described current controller is connected with described current sampling circuit collection, described CPU and the PWM generative circuit of being connected respectively, consists of the current closed-loop feedback circuit; Described voltage controller is connected with described flow equalizing circuit, described voltage sampling circuit, described CPU and the PWM generative circuit of being connected respectively, consists of the voltage close loop feedback circuit; Described PWM generative circuit is connected with described power transforming main circuit by described drive circuit;
Described power transforming main circuit is connected with electric automobile power battery; Connect between described power transforming main circuit and the described electric automobile power battery current sampling circuit is set, be arranged in parallel voltage sampling circuit;
Described CPU is connected with described communication equipment, man-machine interface and the equal current relay of being connected respectively.
3. parallel current-equalizing circuit as claimed in claim 2, it is characterized in that, described flow equalizing circuit comprise resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8, resistance R 9, resistance R 10, CBB capacitor C 1, CBB capacitor C 2, CBB capacitor C 3, CBB capacitor C 4,, operational amplifier U1, operational amplifier U2 and photoelectrical coupler U3;
The output of described current sampling circuit is connected with resistance R through the resistance R 1 of series connection and is connected with the in the same way input of described operational amplifier U1; The reverse input end of described operational amplifier U1 is connected with its output; The output of described operational amplifier U1 is connected with the reverse input end of described operational amplifier U2 by resistance R 4, and the resistance R 5 that the output of described operational amplifier U1 passes through to connect is connected with resistance R and is connected with the in the same way input of described operational amplifier U2; The output of described operational amplifier U2 is by resistance R 7 and resistance R 8 ground connection of series connection; The common port that resistance R 7 is connected with resistance R is connected with high level by resistance R 9; Described CBB capacitor C 4 one ends are connected other end ground connection with described voltage controller by described resistance R 10; Described photoelectrical coupler U3 is connected in parallel between described resistance R 8 and the described CBB capacitor C 4;
Described resistance R 2 and branch road of described CBB capacitor C 1 formation in parallel, its branch road one end ground connection, the other end is connected between described resistance R 1 and the resistance R 3;
In parallel with described CBB capacitor C 3 and described operational amplifier U2 after described CBB capacitor C 2 and resistance R 7 series connection.
4. parallel current-equalizing circuit as claimed in claim 2, it is characterized in that described current-sharing relay comprises resistance R 14, resistance R 15, resistance R 16, resistance R 17, resistance R 18, CBB capacitor C 7, CBB capacitor C 8, CBB capacitor C 9, triode Q1, triode Q2, diode D1, operational amplifier U4 and relay U5;
Control signal end S1 is connected with described triode Q1 base stage by described resistance R 16; Described triode Q1 grounded emitter; Described CBB capacitor C 8 is connected in parallel between described triode Q1 base stage and the emitter;
Control signal end S2 is connected with described operational amplifier U4 reverse input end; Described operational amplifier U4 in the same way input connects+5V voltage by resistance R 14; Described resistance R 15 and described CBB capacitor C 6 be in parallel to consist of a branch road, its branch road one end ground connection, and the other end is connected to described resistance R 14 and operational amplifier U4 in the same way between the input; Described operational amplifier U4 output is connected with described triode Q2 base stage by resistance R 18; Described CBB capacitor C 9 is connected in parallel between described triode Q2 base stage and the emitter; Described triode Q2 collector electrode connects high level by diode D1; Described relay U5 is in parallel with described diode D1;
Described operational amplifier U4 output is connected with described triode Q1 collector electrode;
Described CBB capacitor C 7 one ends are connected other end ground connection with control signal end S2.
5. parallel current-equalizing circuit as claimed in claim 2 is characterized in that, described voltage sampling circuit comprises resistance R 11, resistance R 12, resistance R 13 and CBB capacitor C 5; After described resistance R 11 and resistance R 12 series connection, an end is connected with described power transforming main circuit, and the other end is connected with described voltage controller; Described resistance R 13 and branch road of described CBB capacitor C 5 formations in parallel, its branch road one end ground connection, the other end is connected between described resistance R 12 and the described voltage controller.
6. parallel current-equalizing circuit as claimed in claim 2 is characterized in that, described power transforming main circuit comprises three-phase rectifier, LC filter I, high-frequency inverter, high frequency transformer, hf rectifier and the LC filter II of successively series connection.
7. parallel current-equalizing circuit as claimed in claim 2 is characterized in that, described voltage controller comprises resistance R 19, resistance R 20, resistance R 21, resistance R 22, resistance R 23, CBB capacitor C 10, CBB capacitor C 11, CBB capacitor C 12 and operational amplifier U6; Described flow equalizing circuit output is connected with described operational amplifier U6 reverse input end by resistance R 19, described CPU output pass through resistance R 20 and described operational amplifier U6 in the same way input be connected; Described operational amplifier U6 output is connected with described PWM generative circuit by resistance R 23; Described resistance R 21 and described CBB capacitor C 10 be in parallel to consist of a branch road, its branch road one end ground connection, and the other end is connected to described resistance R 20 and operational amplifier U6 in the same way between the input;
In parallel with described CBB capacitor C 12 and described operational amplifier U6 after described CBB capacitor C 11 and resistance R 22 series connection.
8. parallel current-equalizing circuit as claimed in claim 2 is characterized in that, described current controller comprises resistance R 24, resistance R 25, resistance R 26, resistance R 27, CBB capacitor C 13, CBB capacitor C 14, CBB capacitor C 15 diode D2 and operational amplifier U7; Described current sampling circuit output is connected with described operational amplifier U7 reverse input end by resistance R 24, described CPU output pass through resistance R 25 and described operational amplifier U7 in the same way input be connected; Described operational amplifier U7 output is connected with resistance R and is connected with described PWM generative circuit by the diode D2 of series connection; Described CBB capacitor C 15 1 ends are connected to described resistance R 25 and operational amplifier U7 in the same way between the input, other end ground connection;
In parallel with described CBB capacitor C 13 and described operational amplifier U7 after described CBB capacitor C 13 and resistance R 26 series connection.
9. parallel current-equalizing circuit as claimed in claim 7 is characterized in that, described operational amplifier U6 comprises with LM358 operational amplifier or LF353 operational amplifier.
10. parallel current-equalizing circuit as claimed in claim 8 is characterized in that, described operational amplifier U7 comprises with LM358 operational amplifier or LF353 operational amplifier.
11., it is characterized in that the PWM generative circuit comprises that model is UC3875 current/voltage phase-shifting full-bridge PWM controller such as claim 2,7 or 8 arbitrary described parallel current-equalizing circuits.
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| CN 201220229725 CN202840651U (en) | 2012-05-21 | 2012-05-21 | Parallel current sharing circuit of charging module of electric automobile charger |
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| CN 201220229725 CN202840651U (en) | 2012-05-21 | 2012-05-21 | Parallel current sharing circuit of charging module of electric automobile charger |
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| CN202840651U true CN202840651U (en) | 2013-03-27 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734285A (en) * | 2015-02-26 | 2015-06-24 | 张家港市华为电子有限公司 | Method for guaranteeing current-equalizing charging of charging machines when charging machines are connected in parallel |
| CN106787759A (en) * | 2016-12-30 | 2017-05-31 | 山东鲁能智能技术有限公司 | A kind of load current equalization methods of charging pile, device and charging pile |
| CN108111074A (en) * | 2018-01-15 | 2018-06-01 | 陕西航空电气有限责任公司 | A kind of high tension direct current generator Regulation Control device with parallel current-sharing |
| CN109030030A (en) * | 2018-08-16 | 2018-12-18 | 杭州容大智造科技有限公司 | A kind of device and method using current detecting suspension |
| CN110014886A (en) * | 2017-10-12 | 2019-07-16 | 现代自动车株式会社 | On-board charging system |
| CN110171305A (en) * | 2019-03-29 | 2019-08-27 | 重庆金康动力新能源有限公司 | Charging method, system, device, equipment, storage medium and electric car |
| CN110497808A (en) * | 2019-08-28 | 2019-11-26 | 哈尔滨理工大学 | A kind of charging system for electric automobile and charging method with a variety of charge modes |
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- 2012-05-21 CN CN 201220229725 patent/CN202840651U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734285A (en) * | 2015-02-26 | 2015-06-24 | 张家港市华为电子有限公司 | Method for guaranteeing current-equalizing charging of charging machines when charging machines are connected in parallel |
| CN106787759A (en) * | 2016-12-30 | 2017-05-31 | 山东鲁能智能技术有限公司 | A kind of load current equalization methods of charging pile, device and charging pile |
| CN110014886A (en) * | 2017-10-12 | 2019-07-16 | 现代自动车株式会社 | On-board charging system |
| CN108111074A (en) * | 2018-01-15 | 2018-06-01 | 陕西航空电气有限责任公司 | A kind of high tension direct current generator Regulation Control device with parallel current-sharing |
| CN108111074B (en) * | 2018-01-15 | 2020-07-03 | 陕西航空电气有限责任公司 | High-voltage direct-current generator voltage regulation control device with parallel current sharing function |
| CN109030030A (en) * | 2018-08-16 | 2018-12-18 | 杭州容大智造科技有限公司 | A kind of device and method using current detecting suspension |
| CN110171305A (en) * | 2019-03-29 | 2019-08-27 | 重庆金康动力新能源有限公司 | Charging method, system, device, equipment, storage medium and electric car |
| CN110171305B (en) * | 2019-03-29 | 2021-03-30 | 重庆金康动力新能源有限公司 | Charging method, system, device, equipment, storage medium and electric vehicle |
| CN110497808A (en) * | 2019-08-28 | 2019-11-26 | 哈尔滨理工大学 | A kind of charging system for electric automobile and charging method with a variety of charge modes |
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