CN102710000B - 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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Abstract
The invention 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 communication signal lines; and the charging modules are connected through average current signal lines, and 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 invention, 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 present invention relates to electric automobile field, be 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; at aspects such as alleviating energy crisis, promotion environment and mankind's harmonious development, there is incomparable advantage; 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, 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 is a kind ofly arranged on that electric automobile is external, AC energy to be transformed to direct current energy and to adopt conduction pattern be the special purpose device 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, phase control type charger is owing to existing the shortcomings such as efficiency is low, large to mains by harmonics interference, maintenance is inconvenient to be replaced by high frequency switch type charger gradually.In order to meet the especially charging demand of electric commercial vehicle electrokinetic cell high-voltage great-current of current electric automobile, and consider the performance index such as reliability and maintainability of charger, 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 cannot 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, conventional current-sharing control method mainly contains following several:
(1) output impedance method.This method is mainly by regulating the external characteristic gradient (being regulation output impedance) of each charged in parallel module, to reach the object of parallel module load-sharing electric current.This method is fairly simple, and major defect is that 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, from module, only has current closed-loop to control, and allly from module, by the given value of current signal of following primary module and producing, realizes current-sharing.The shortcoming of this method is that the primary module whole system that lost efficacy can not be worked, and reliability is not high.
(3) by average current value automatic current equalizing method.This method can accurately realize current-sharing, but is short-circuited when bus, or a power supply on bus be when can not work, and busbar voltage declines, and will make each supply voltage lower, and even arrives its lower limit, causes fault.
(4) maximum current automatic current equalizing method.This current-sharing control method effect is better, shortcoming be principal and subordinate's module always in continuous switching, can cause the output current of modules to produce low-frequency oscillation; And because each all take maximum current as regulating object from module, will inevitably make parallel system output voltage higher than rated voltage, produce overvoltage, and the larger overvoltage phenomenon of the output impedance of power supply be more obvious.
The shortcoming and defect of existing current sharing control method, has limited the overall performance of electric automobile battery charger charging module parallel running, has affected the Industry Promotion application of electric automobile battery charger.
Summary of the invention
For the deficiencies in the prior art, the invention provides a kind of parallel current-equalizing circuit of electric automobile battery charger charging module, improved the utilance of charging module, realized current-sharing precision high, the advantages such as rapid dynamic response speed.
The parallel current-equalizing circuit of a kind of electric automobile battery charger charging module provided by the invention, comprises charger monitoring unit formation in parallel with at least one charging module; In parallel between charging module; Its improvements are, described charger monitoring unit is connected with charging module by signal of communication line; Between described charging module, by current signal line, connect; Described charging module exchanges end with electrical network respectively and is connected with 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;
The given value of current value that described current controller provides according to described power transforming main circuit output end current value and the described CPU of described current sampling circuit collection is carried out current closed-loop FEEDBACK CONTROL; The described power transforming main circuit output end voltage value of the magnitude of voltage that described voltage controller provides according to described flow equalizing circuit, described voltage sampling circuit collection and the voltage given value that described CPU provides are carried out voltage close loop FEEDBACK CONTROL; The output signal of described current controller and the output signal of described voltage controller are passed to after described PWM generative circuit is modulated and are passed to described power transforming main circuit by described drive circuit;
Described power transforming main circuit is connected with electric automobile power battery.
Wherein, described flow equalizing circuit, using the output signal of described current sampling circuit output signal and described equal current relay as input signal, carries out after difference computing, through operation amplifier and isolation, the input signal using its output signal as described voltage controller.
Wherein, described current-sharing relay comprises control signal end S1 and control signal end S2, and when the control signal of the control signal of control signal end S1 and control signal end S2 is low level simultaneously, all current relay is open-minded; If high level appears in the control signal of the control signal of control signal end S1 or control signal end S2, all current relay disconnects.
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 the input in the same way of described operational amplifier U1 with resistance R 3 through the resistance R 1 of series connection; 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 output of described operational amplifier U1 is connected with the input in the same way of described operational amplifier U2 with resistance R 6 by the resistance R 5 of series connection; The output of described operational amplifier U2 is by resistance R 7 and resistance R 8 ground connection of series connection; The common port of resistance R 7 and resistance R 8 is connected with high level by resistance R 9; Described CBB capacitor C 4 one end are connected with described voltage controller by described resistance R 10, other end ground connection; Described photoelectrical coupler U3 is connected in parallel between described resistance R 8 and described CBB capacitor C 4;
Described resistance R 2 and a 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 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 emitter;
Control signal end S2 is connected with described operational amplifier U4 reverse input end; Described operational amplifier U4 in the same way input by connect+5V of resistance R 14 voltage; Described resistance R 15 and described CBB capacitor C 6 be in parallel forms 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 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 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 end are connected with control signal end S2, other end ground connection.
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, one end is connected with described power transforming main circuit, and the other end is connected with described voltage controller; Described resistance R 13 and a 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 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 series connection successively.
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 by 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 forms 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 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 by resistance R 25 and described operational amplifier U7 in the same way input be connected; Described operational amplifier U7 output is connected with described PWM generative circuit with resistance R 23 by the diode D2 of series connection; Described CBB capacitor C 15 one end are connected to described resistance R 25 and operational amplifier U7 in the same way between 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.
Compared with the prior art, beneficial effect of the present invention is:
1, flow equalizing circuit of the present invention 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 current-sharing parameter can regulate easily according to actual needs and arrange.Current-sharing precision is high, rapid dynamic response speed, and nonuniform fluid is less than 2%.
2, the present invention regulates different from traditional current-sharing control method by regulating the given signal of output voltage of parallel module to realize charging current, in the present invention, the output regulating and controlling signal of flow equalizing circuit is connected to the output voltage sampling feedback circuit of charging module, by dynamic adjustment charging module output voltage feedback parameter, is realized the charging current of each charging module is regulated; Meanwhile, by controlling opening of equal current relay, constantly make flow equalizing circuit after charging module output voltage is set up completely, just put into parallel system, the defect that can avoid traditional flow equalizing circuit easily to cause parallel system output voltage to raise.
3, the equal current relay of the present invention is only controlled CPU at charging module and is sent while opening signal and charging module fault-free just open-mindedly, and flow equalizing circuit is just put into parallel system thereafter.During operational blocks which partition system fault, this module main circuit quits work automatically, all current relay automatic disconnections, and this module exits 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.
Accompanying drawing explanation
Fig. 1 is electric automobile battery charger theory diagram provided by the invention.
Fig. 2 is charger charging module structured flowchart provided by the invention.
Fig. 3 is charging module power transforming main circuit theory diagram provided by the invention.
Fig. 4 is charging module output voltage sampling provided by the invention and flow equalizing circuit schematic diagram.
Fig. 5 is equal current relay provided by the invention and control circuit schematic diagram thereof.
Fig. 6 is charging module electric current and voltage controller provided by the invention and PWM generative circuit implementation.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
Its block diagram of parallel current-equalizing circuit of a kind of electric automobile battery charger charging module of the present embodiment as shown in Figure 1, comprises charger monitoring unit formation in parallel with at least one charging module; In parallel between charging module; Charger monitoring unit is connected with charging module by signal of communication line; Between described charging module, by average current signal line, connect; Described charging module exchanges end with electrical network respectively and is connected with electric automobile power battery DC terminal.Monitoring unit major function is: collect the related data of each charging module and upload to charging station monitoring system on the one hand; The dependent instruction that receives on the other hand and carry out charging station monitoring system and electric automobile power battery management system (BMS), carries out control and management to the operating state of charger and charging process.
Its structure chart of charging module as shown in Figure 2, 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.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 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 (by user or electric automobile power battery management system, being set) are carried out voltage close loop FEEDBACK CONTROL; During constant voltage charge, control loop automatically switches to voltage close loop, charging module output constant voltage; During constant current charge, control loop automatically switches to current closed-loop, charging module output constant current.The output signal of current controller and the output signal of voltage controller are passed to after described PWM generative circuit is modulated and are passed to power transforming main circuit by drive circuit; Power transforming main circuit is connected with electric automobile power battery.
In Fig. 2, man-machine interface is the interactive interface between charging module attended operation personnel and charging module, for showing the relevant informations such as the operating state of charging module and running parameter, and for providing charging module, charger attended operation personnel control the correlation functions such as calibration, Measurement and calibration and manual operation; Communication equipment comprises the two parts of communicating by letter between charging module CPU and charger monitoring unit and charging module CPU and man-machine interface, has been used between charging module and 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, CPU receives the charge parameters such as charging voltage that charger monitoring unit issues, charging current by communication equipment, 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; Meanwhile, CPU gathers other related work state informations of the actual charging voltage of charging module, charging current and charging module by sample circuit, and information is uploaded to charger monitoring unit.
Power transforming main circuit block diagram as shown in Figure 3, comprises three-phase rectifier, LC filter I, high-frequency inverter, high frequency transformer, hf rectifier and the LC filter II of series connection successively.As shown in the figure, the three-phase and four-line alternating current of input obtains Rectified alternating current after three-phase rectifier rectification, through LC filter smoothing, filtering obtains the direct current that alternating current component is very little again, this direct current is transformed into high frequency square wave alternating voltage after high-frequency inversion, then after the isolation of high frequency transformer transformation, hf rectifier rectification and LC filtering, obtains high-quality direct current energy to electric automobile power battery charging.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.
Flow equalizing circuit structure chart as shown in Figure 4, it is using the output signal of described current sampling circuit output signal and described equal current relay as input signal, carry out after difference computing, through operation amplifier and isolation, the input signal using 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 described current sampling circuit sampled signal Iof1 dividing potential drop, its output is connected with the input in the same way of described operational amplifier U1 with resistance R 3 through the resistance R 1 of series connection; 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 output of described operational amplifier U1 is connected with the input in the same way of described operational amplifier U2 with resistance R 6 by the resistance R 5 of series connection; Operational amplifier U2 is by the difference of equalizing controller output signal Iav1 and Iof1 after proportional integral computing, and its output is by resistance R 7 and resistance R 8 ground connection of series connection; The common port of resistance R 7 and resistance R 8 is connected with high level by resistance R 9; Described CBB capacitor C 4 one end are connected with described voltage controller by described resistance R 10, other end ground connection; Described photoelectrical coupler U3 is connected in parallel between described resistance R 8 and described CBB capacitor C 4, resistance R 8 earth terminals are connected with the negative electrode of the former limit light-emitting diode of photoelectrical coupler U3, and the other end of resistance R 8 is connected 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 a 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 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 tries 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, when module output voltage is normal, provide equal current relay and open signal (S1 output low level), when module output voltage is abnormal, S1 exports high level and disconnects equal current relay through control circuit; The control signal of control signal end S2, from module total failare signal, provides equal current relay and opens signal (S2 output low level) when module fault-free, once charging module breaks down, S2 output high level also disconnects equal current relay through control circuit.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 emitter; Control signal end S2 is connected with described operational amplifier U4 reverse input end; Described operational amplifier (U4) in the same way input by connect+5V of resistance R 14 voltage; Described resistance R 15 and described CBB capacitor C 6 be in parallel forms 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 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 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 end are connected with control signal end S2, other end ground connection.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 conventional transistors 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, one end is connected with described power transforming main circuit, and the other end is connected with described voltage controller; Described resistance R 13 and a 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 described voltage controller.
Current sampling circuit can consist of various types of current sensors such as Halls, also can adopt series resistance sample mode.
Voltage controller as shown in Figure 6, 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 by 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 forms 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 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 as shown in Figure 6, 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 by resistance R 25 and described operational amplifier U7 in the same way input be connected; Described operational amplifier U7 output is connected with described PWM generative circuit with resistance R 23 by the diode D2 of series connection; Described CBB capacitor C 15 one end are connected to described resistance R 25 and operational amplifier U7 in the same way between 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 to make for a certain reason the charging current sampled signal Iof1 of module 1 to be greater than all parallel module average current signal Iav1, analyze the known proportional-plus-integral action due to 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, now in the effect lower module charging voltage of the voltage and current closed control circuit of module, reducing charging current reduces, until Iof1 equates with Iav1, thereby realize the object of each parallel module load-sharing electric current.Same analysis is known, once make for a certain reason the charging current sampled signal Iof1 of module 1 be 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 present invention and control circuit schematic diagram thereof.Analyze knownly, be only low level when fault-free (only normal at module output voltage and) at S1 and S2 simultaneously, and Q2 just understands conducting and makes current-sharing relay closes.As long as occurring that the abnormal or module of module output voltage breaks down makes S1 or S2 become high level, will inevitably cause Uc voltage is zero, Q2 cut-off; all current relay disconnects; malfunctioning module exits parallel system, prevents that fault from expanding, thereby improves the reliability of parallel system.
Fig. 6 has provided a kind of charging module electric current and voltage closed loop controller based on 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/voltage phase shift full bridge PWM controller that American TI Company is produced, 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 Uof1 signal is connected to the output of flow equalizing circuit on the one hand, for current-sharing, regulates, and is connected on the other hand voltage controller, for charging module output voltage control.When the charging module constant voltage of the present embodiment is worked, in current closed-loop controller, operational amplifier U7 is in positive saturation condition, and voltage close loop controller is in linear working state, and diode D2 ends, the charging voltage of module stable output; In charging module constant current when work,, in voltage close loop controller, operational amplifier U6 is in positive saturation condition, and current closed-loop controller is in linear working state, the automatic conducting of diode D2, and control module is exported constant charging current.Vipid is that voltage controller (PID control) and the current controller (PID control) of charging module exported the signal obtaining after processing, it is input to the E/A+ of the input in the same way 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 power transforming main circuit by drive circuit.
Overall flow of the present invention is: the charging voltage that charging module CPU issues according to charger monitoring unit and charging current information, provide charging module voltage given signal and given value of current signal, module voltage controller carries out PID adjusting to voltage given signal and charging voltage sampled signal, it is Vipid that blocks current controller carries out obtaining total PID signal after PID adjusting 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, after drive amplification, control the power switch pipe in charging module power conversion principal current, the adjusting of realization to charging module charging voltage and charging current.The present invention has higher current-sharing precision and current-sharing dynamic responding speed, is conducive to improve the reliability and maintainability energy of charger, can better meet the charging demand of electric automobile power battery.
Finally should be noted that: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although the present invention is had been described in detail with reference to above-described embodiment, those of ordinary skill in the field are to be understood that: still can modify or be equal to replacement the specific embodiment of the present invention, and do not depart from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of claim scope of the present invention.
Claims (9)
1. a parallel current-equalizing circuit for electric automobile battery charger charging module, comprises charger monitoring unit formation in parallel with at least one charging module; In parallel between charging module; It is characterized in that, described charger monitoring unit is connected with charging module by signal of communication line; Between described charging module, by current signal line, connect; Described charging module exchanges end with electrical network respectively and is connected with electric automobile power battery DC terminal
Described parallel current-equalizing circuit, 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;
The given value of current value that described current controller provides according to described power transforming main circuit output end current value and the described CPU of described current sampling circuit collection is carried out current closed-loop FEEDBACK CONTROL; The described power transforming main circuit output end voltage value of the magnitude of voltage that described voltage controller provides according to described flow equalizing circuit, described voltage sampling circuit collection and the voltage given value that described CPU provides are carried out voltage close loop FEEDBACK CONTROL; The output signal of described current controller and the output signal of described voltage controller are passed to after described PWM generative circuit is modulated and are passed to described power transforming main circuit by described drive circuit;
Described power transforming main circuit is connected with electric automobile power battery.
2. parallel current-equalizing circuit as claimed in claim 1, it is characterized in that, described flow equalizing circuit is using the output signal of described current sampling circuit output signal and described equal current relay as input signal, carry out after difference computing, through operation amplifier and isolation, the input signal using its output signal as described voltage controller.
3. parallel current-equalizing circuit as claimed in claim 2, it is characterized in that, described current-sharing relay comprises control signal end S1 and control signal end S2, and when the control signal of the control signal of control signal end S1 and control signal end S2 is low level simultaneously, all current relay is open-minded; If high level appears in the control signal of the control signal of control signal end S1 or control signal end S2, all current relay disconnects.
4. parallel current-equalizing circuit as claimed in claim 3, is characterized in that, 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 the input in the same way of described operational amplifier U1 with resistance R 3 through the resistance R 1 of series connection; 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 output of described operational amplifier U1 is connected with the input in the same way of described operational amplifier U2 with resistance R 6 by the resistance R 5 of series connection; The output of described operational amplifier U2 is by resistance R 7 and resistance R 8 ground connection of series connection; The common port of resistance R 7 and resistance R 8 is connected with high level by resistance R 9; Described CBB capacitor C 4 one end are connected with described voltage controller by described resistance R 10, other end ground connection; Described photoelectrical coupler U3 is connected in parallel between described resistance R 8 and described CBB capacitor C 4;
Described resistance R 2 and a 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 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.
5. parallel current-equalizing circuit as claimed in claim 4, is characterized in that, 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 emitter;
Control signal end S2 is connected with described operational amplifier U4 reverse input end; Described operational amplifier U4 in the same way input by connect+5V of resistance R 14 voltage; Described resistance R 15 and described CBB capacitor C 6 be in parallel forms 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 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 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 end are connected with control signal end S2, other end ground connection.
6. parallel current-equalizing circuit as claimed in claim 2, is characterized in that, 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, one end is connected with described power transforming main circuit, and the other end is connected with described voltage controller; Described resistance R 13 and a 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 described voltage controller.
7. 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 series connection successively.
8. parallel current-equalizing circuit as claimed in claim 2, is characterized in that, 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 by 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 forms 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 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.
9. parallel current-equalizing circuit as claimed in claim 2, is characterized in that, 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 by resistance R 25 and described operational amplifier U7 in the same way input be connected; Described operational amplifier U7 output is connected with described PWM generative circuit with resistance R 23 by the diode D2 of series connection; Described CBB capacitor C 15 one end are connected to described resistance R 25 and operational amplifier U7 in the same way between 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.
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| CN201210158893.3A CN102710000B (en) | 2012-05-21 | 2012-05-21 | Parallel current sharing circuit of charging module of electric automobile charger |
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