CN105186877A - Charging power source module parallel circuit and power source module thereof - Google Patents
Charging power source module parallel circuit and power source module thereof Download PDFInfo
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Abstract
The invention relates to a charging power source module parallel circuit and a power source module thereof. The charging power source module parallel circuit comprises at least two parallel switching power source modules; the switching power source module includes a main circuit unit and a control unit; and the control circuit comprises a voltage detection circuit, a current equalizing current outer-loop circuit, a voltage inner-loop circuit, an anti-failure circuit unit and a PWM circuit unit, wherein the anti-failure circuit unit controls the current equalizing current outer-loop circuit, and disables the current equalizing current outer-loop circuit when the voltage of a voltage adjustment transformer is lower than a set value, and enables the current equalizing current outer-loop circuit when the voltage of the voltage adjustment transformer is higher than the set value. With the charging power source module parallel circuit of the invention adopted, the problem that a certain power source module quits a working state when the output voltage of the power source module is low and is clamped by the output voltage of the other parallel power source modules in a charging circuit parallel power source module can be solved.
Description
Technical field
The present invention relates to a kind of charging power modules parallel circuits and power module thereof, mainly effectively solve charging electric vehicle time parallel electric source module in a certain power module by the problem of dieback.
Background technology
The world today; environmental pollution is serious, and crisis appears in the energy, and electric automobile becomes the focus of people's concern gradually with the feature of its emission-free pollution, low energy consumption; commercially tool has an enormous advantage, and the powerful growth momentum of electric automobile has also driven the research and development of charging electric vehicle power supply.
At present, State Grid Corporation of China promotes the development of electric automobile charging station energetically, and this just requires that powerful electric automobile battery charger must follow up.Charging electric vehicle power supply adopts the mode of multiple power module parallel operation to realize powerful output usually, due to the factor such as restriction and part characteristic difference of technological level, only that each power module is simply in parallel, be difficult to ensure the even load sharing electric current of each module.Simultaneously, in the power module of parallel connection, there is startup sequence problem in modules, the power module first started is by with whole loads, simultaneously its output voltage can by the output voltage of the power module of rear startup to clamp, cause start the delayed power module of sequential cannot start or start after can not the problem of bringing onto load work.
For such problem, the measure taked at present has three kinds: (1) adds at output and cuts off diode (see accompanying drawing 1), and the power consumption that this measure cuts off on diode in High-current output occasion is comparatively large, causes efficiency not increase; (2) add D.C. contactor (see accompanying drawing 2) at output, heavy DC contactor cost is higher, and volume is comparatively large, and need increase by tunnel isolation drive power supply, this measure decreases device Available volume, adds cost.(3) increase a failure detector circuit (see accompanying drawing 3), this circuit comprises voltage detecting circuit and drive circuit, is detected the size of output voltage by the resistance value changing feedback resistance in voltage feedback network.
As the patent of invention that application number is 201410290815.8 " parallel power supply system and power modules thereof for fault detect ", just provide a kind of execution mode of aforesaid way (3), as shown in Figure 3, voltage detecting circuit comprises an isolating transformer Tr1, the former limit of Tr1 is connected on the output terminals A of full-bridge circuit, B, can sample A, B two point voltage signal play buffer action simultaneously.Tr1 secondary drives connection switching tube Q5 by a rectifier bridge (D7, D8, D9, D10), and the output of Q5 is connected to the I/O port of MCU.Primary voltage of transformer is gathered by isolating transformer Tr1, when power module does not start, Q1, Q4 not conducting, Tr1 cannot detect A, the voltage that B is 2, switching tube Q5 is without drive singal then not conducting, microprocessor detect is to high level signal, system validation fault, then Q6 drive singal is high conducting, at this moment output voltage feedback resistance is RF2, the parallel feedback network of RF1 composition, feedback resistance is RF2, the resistance in parallel of RF1, feedback resistance detects that output voltage is less, voltage close loop is exported increase, output voltage raises, module will restart and raise voltage, output voltage is made to reach balance, to realize the startup of power module, solve the problem of parallel electric source module dieback.
In such scheme (3), when practical operation, still can produce dieback phenomenon.Discovery is analyzed through us, this type of power module generally arranges double-closed-loop control, inner ring is voltage inter-loop, and outer shroud is current-sharing electric current outer shroud, and electric current loop input is respectively given value of current value IF and current-sharing electric current CS (on average being obtained by each power module electric current of parallel connection).Adopt such scheme, although can feedback resistance be reduced, but the output of current-sharing electric current outer shroud can affect the voltage given value VG of (reduction) voltage inter-loop, the error signal EO of VG and VF is caused effectively not increase, therefore, if in fact only adopt such scheme, not necessarily dieback phenomenon can be solved completely.
Summary of the invention
The object of this invention is to provide a kind of charging power modules parallel circuits, effectively can not solve the defect of parallel electric source module dieback problem in order to solve prior art.In addition, present invention also offers the power module being applied to above-mentioned parallel circuits.
For achieving the above object, the solution of the present invention comprises:
A kind of charging power modules parallel circuits, comprise at least two switch power modules in parallel, switch power module comprises main circuit unit and control unit, control circuit comprises voltage detecting circuit, the outer loop circuit of current-sharing electric current, voltage inter-loop circuit, anti-dieback circuit unit and pwm circuit unit, voltage detecting circuit is for detecting the voltage of the voltage regulating transformer in main circuit, described anti-dieback circuit unit sampling connects described voltage detecting circuit, described pwm circuit is for controlling the current transformer in main circuit, described anti-dieback circuit unit controls the outer loop circuit of described current-sharing electric current, when the voltage of voltage regulating transformer is lower than set point, the outer loop circuit of invalid described current-sharing electric current, when the voltage of voltage regulating transformer is higher than set point, the outer loop circuit of effective described current-sharing electric current.
Further, the outer loop circuit of described current-sharing electric current comprises an operational amplifier (U11B), two inputs of this operational amplifier (U11B) are respectively used to the current output signal (IF) and the current-sharing signal (CS) that connect corresponding power module, output is used for being connected to outer voltage circuit, described anti-dieback circuit unit controls a switching tube (Q5), and this switching tube is located between described current-sharing signal (CS) and operational amplifier (U15B); Or between the current output signal of corresponding power module (IF) and operational amplifier (U15B), or operational amplifier (U11B) exports between outer voltage circuit.
Further, described voltage detecting circuit sampling connects former limit or the secondary of the voltage regulating transformer in described main circuit.
Further, described voltage inter-loop circuit connects voltage feedback signal, voltage feedback signal takes from parallel feedback resistance circuit, described parallel feedback resistance circuit is made up of feedback network branch resistance (R12) and resistance branch (R28, R29, R30) in parallel with it, and in resistance branch, string is provided with the switch (V2) being controlled by described anti-dieback circuit unit.
Further, described switching tube Q5 is triode or MOSFET.
Present invention also offers a kind of charging power modules, switch power module comprises main circuit unit and control unit, control circuit comprises voltage detecting circuit, the outer loop circuit of current-sharing electric current, voltage inter-loop circuit, anti-dieback circuit unit and pwm circuit unit, voltage detecting circuit is for detecting the voltage of the voltage regulating transformer in main circuit, described anti-dieback circuit unit sampling connects described voltage detecting circuit, described pwm circuit is for controlling the current transformer in main circuit, described anti-dieback circuit unit controls the outer loop circuit of described current-sharing electric current, when the voltage of voltage regulating transformer is lower than set point, the outer loop circuit of invalid described current-sharing electric current, when the voltage of voltage regulating transformer is higher than set point, the outer loop circuit of effective described current-sharing electric current.
Further, the outer loop circuit of described current-sharing electric current comprises an operational amplifier (U11B), two inputs of this operational amplifier (U11B) are respectively used to the current output signal (IF) and the current-sharing signal (CS) that connect corresponding power module, output is used for being connected to outer voltage circuit, described anti-dieback circuit unit controls a switching tube (Q5), and this switching tube is located between described current-sharing signal (CS) and operational amplifier (U15B); Or between the current output signal of corresponding power module (IF) and operational amplifier (U15B), or operational amplifier (U11B) exports between outer voltage circuit.
Further, described voltage detecting circuit sampling connects former limit or the secondary of the voltage regulating transformer in described main circuit.
Further, described voltage inter-loop circuit connects voltage feedback signal, voltage feedback signal takes from parallel feedback resistance circuit, described parallel feedback resistance circuit is made up of feedback network branch resistance (R12) and resistance branch (R28, R29, R30) in parallel with it, and in resistance branch, string is provided with the switch (V2) being controlled by described anti-dieback circuit unit.
Further, described switching tube Q5 is triode or MOSFET.
In the present invention, anti-dieback circuit unit is when the voltage of voltage regulating transformer is lower than set point, the outer loop circuit of invalid described current-sharing electric current, current-sharing electric current outer shroud is not exported, voltage reference value VG would not be affected, ensure that error signal EO can effectively increase, thus the defect that prior art effectively can not solve parallel electric source module dieback problem can be solved, make the power supply that each power module in charging power modules parallel circuits can be continual and steady.
Anti-dieback circuit, when the outer loop circuit of invalid current-sharing electric current, has three kinds of modes, can arbitrarily select.
Anti-dieback circuit unit in charging power modules parallel circuits power module, adopt switching tube be triode or MOSFET pipe, power consumption is less, and circuit can be made well to raise the efficiency; Anti-dieback circuit unit simultaneously in power module adopt triode or metal-oxide-semiconductor integrated, make power module cost lower and small volume.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of prior art (1);
Fig. 2 is the circuit theory diagrams of prior art (2);
Fig. 3 is the circuit theory diagrams of prior art (3);
Fig. 4 is overall theory structure schematic diagram of the present invention;
Fig. 5 is the circuit theory diagrams of the embodiment of the present invention 1;
Fig. 6 is the circuit theory diagrams of the embodiment of the present invention 2.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Embodiment 1
Lower mask body introduces a kind of charge power supply parallel circuits for electric automobile.
Charging power modules parallel circuits as shown in Figure 4,5, the output of each power module is connected in parallel on bus, each power module comprises main circuit and control circuit, control circuit comprises voltage detecting circuit, current-sharing electric current outer loop circuit, voltage inter-loop circuit, anti-dieback circuit unit and pwm circuit, voltage detecting circuit is for detecting the voltage of the voltage regulating transformer in main circuit, and pwm circuit is for controlling the current transformer in main circuit.
Concrete, main circuit agent structure is current transformer, comprise H bridge rectification circuit (as MOSFET pipe Q1, Q2, Q3, Q4 in Fig. 5 the circuit that forms), voltage regulating transformer T1, do not control inverter circuit (as diode D1, D2, D3, D4 in Fig. 5 the circuit that forms).
Voltage detecting circuit comprises two parts, and as shown in Figure 4, a part is for gathering main circuit output voltage, and R12 and R10, R11 are connected on main circuit and export upper (as shown in Figure 5), and R12 is feedback resistance.Another part is transformer Acquisition Circuit, for gathering voltage regulating transformer secondary voltage.Concrete, as shown in Figure 5, transformer Acquisition Circuit comprises: form sampled voltage at the Same Name of Ends voltage of voltage regulating transformer secondary through diode D20, the D21 of over commutation, divider resistance R21, R22, sampled voltage is connected to the base stage of triode V1 through resistance R23.The collector electrode of triode V1 connects power supply VCC by pull-up resistor R25, and the collector electrode of triode V1 connects the positive pole of diode D22, and the negative pole of diode D22 forms PDS signal.
Voltage inter-loop circuit comprises amplifier U11B, and its input connects feedback voltage signal VF and voltage given signal VG, and it exports as error signal EO.
The outer loop circuit of current-sharing electric current comprises amplifier U15B, and its input is respectively used to connect current-sharing signal CS and given value of current signal IF.(belong to prior art about the generation of CS signal and IF signal, be not introduced at this)
Anti-dieback circuit unit comprises triode V2, V4, MOSFET pipe Q5.The effect of anti-dieback circuit unit comprises: 1, blocks the connection of CS to the outer loop circuit (i.e. U15B) of current-sharing electric current, U15B is not exported, thus can not affect VG by Q5; 2, by V2, feedback resistance is reduced, thus VF signal is reduced, according to error signal EO=(VG-VS)-VF, can find out that the effect of these two aspects all can play the effect increasing EO, therefore, it is possible to effectively prevent dieback.
In the 1st, PDS signal is by the connection between V4, Q5 control CS signal and U15B input, and when Q5 ends, U15B input is high-impedance state.
In the 2nd, the scheme (3) in background technology gives a kind of execution mode, is utilize Single-chip Controlling, feedback resistance is reduced---and the present invention also can adopt this means.In the present embodiment, what specifically provide is a kind ofly do not use the means of single-chip microcomputer: V2, R29, R28, R30 form a resistance branch, and when V2 opens, this resistance branch is in parallel with resistance R12 forms feedback resistance; When V2 ends, feedback resistance is R12.V2 opens and ends with above-mentioned PDS signal relevant, does not need by single-chip microcomputer.
Specifically: triode V2 base stage is connected to the collector electrode of triode V1, and collector series connection has resistance R29, R30, emitter is by resistance R28 ground connection; The base stage of triode V4 is connected to PDS signal, grounded emitter, collector electrode connects the grid of MOSFET pipe Q5, metal-oxide-semiconductor Q5 controls the in-phase end that can current-sharing signal CS enter amplifier U15B, the end of oppisite phase of amplifier U15B is connected to current signal IF, the output of U15B is connected to the in-phase end of amplifier U11B, the end of oppisite phase input voltage signal VF of amplifier U11B, simultaneously output error signal EO.
Voltage detecting circuit gathers voltage regulating transformer voltage, when the voltage detecting circuit of a certain power module detects voltage regulating transformer voltage lower than set point, then the anti-dieback circuit unit of this power module is started working, the outer loop circuit of idle current thus the input of shielding current-sharing signal CS, now amplifier U15B outputs in the signal of amplifier U11B in-phase end, only comprises the operation result of amplifier U15B to current signal IF; Triode V2 conducting simultaneously, in feedback resistive network, feedback resistance R12 and branch resistance R28, R29, R30 are in parallel, feedback resistive network resistance diminishes, voltage signal VF diminishes, thus become large through the error signal EO that amplifier U11B computing exports, effectively regulate power module output voltage by the current transformer in pwm circuit drived control main circuit, this power module will restart raises voltage, output voltage is made to reach balance, to realize the startup of power module.
When power module normally works, triode V1 conducting.PDS is low level, triode V4 not conducting, MOSFET or triode Q5 conducting, current-sharing signal CS enters the in-phase input end of amplifier U15B, the current signal IF of this module enters the inverting input of amplifier U15B simultaneously, the output of amplifier U15B is connected to the in-phase input end of amplifier U11B by resistance R42, voltage given signal VG is connected to the in-phase input end of amplifier U11B by resistance R43, in addition output voltage is by resistance R12 and R10, R11 obtains feedback voltage V F, VF is connected to the inverting input of amplifier U11B by resistance R44, resistance R45, electric capacity C41 and electric capacity C42 forms the pi regulator of voltage loop unit, the output error signal EO of amplifier U11B enters drive circuit, carrying out driving power switching tube is opening and shutoff of Q1 ~ Q4, realize output voltage VF and follow given voltage VG, and carry out the electric current current-sharing for each parallel module by current-sharing signal CS.Now anti-dieback circuit unit does not work.
When the voltage regulating transformer voltage of power module, lower than during set point, (set point can according to circumstances be arranged, the dividing potential drop of R21 and R22 is set, set point can be 0, namely starts during power module no-output), triode V1 not conducting, PDS is high level, anti-dieback circuit working, triode V4 conducting, makes MOSFET or triode Q5 not conducting, current-sharing signal CS does not enter electric current loop, thus gets rid of current-sharing current signal to the impact of voltage given VG.Meanwhile, V2 conducting, feedback resistance is that R12 is in parallel with resistance R28, resistance R29 and resistance R30, and the voltage of feedback signal VF is reduced.Thus EO can be increased by a relatively large margin, realize the startup of this power module.
In the present embodiment, also comprise warning circuit: the output current of transformer secondary flows through diode D20 and D21, carry out rectification, electric capacity E21 carries out filtering to this signal, the voltage signal dividing potential drop that voltage R21, R22 export secondary, obtain d. c. voltage signal, i.e. above-mentioned sampled voltage, this d. c. voltage signal is connected to the base stage of triode V3 by resistance R31, described triode V3 grounded emitter, be connected to resistance R31 on ground with between base stage, the collector electrode of V3 has output signal FAUL by pull-up resistor R33.During normal work, triode V3 conducting, FAUL send low level signal to enter single-chip microcomputer, shows that transformer is normal.When transless or transformer break down, triode V3 not conducting, FAUL is that the high level of VCC enters single-chip microcomputer, and single-chip microcomputer provides corresponding control signal, realizes alarm.Because the pressure regulation of single chip circuit and this circuit does not have direct relation, therefore specifically do not draw in circuit.
After power module normally works, PDS becomes low level, and current-sharing signal CS enters the outer loop circuit of current-sharing electric current, and finally enter into voltage inter-loop circuit, flow equalizing function is loaded into again.
Embodiment 2
Embodiment 1 is, when power module does not work, the in-phase end of amplifier U15B is arranged to high-impedance state, thus shielding current-sharing signal CS.In order to make current-sharing signal inoperative, as other execution modes, the output of amplifier U15B output signal to amplifier U11B can also be cut off, thus invalid current-sharing electric current outer shroud.
Concrete, as shown in Figure 6, when the output voltage of this power module is lower than set point, triode V1 not conducting, PDS is high level, triode V4 conducting, makes MOSFET or triode Q5 not conducting, the signal outputting to amplifier U11B in-phase end of amplifier U15B is cut off, and current-sharing electric current outer shroud is deactivated state.
Embodiment 3
From embodiment 2, embodiment 1 is different is, in order to invalid current-sharing electric current outer shroud, between IF signal and U15B input, arranges switching tube.Particular circuit configurations and embodiment 1 roughly the same, do not repeat them here.
In above embodiment 1,2,3, while invalid current-sharing electric current outer shroud, also regulate feedback resistive network that output voltage VF is diminished, as other execution modes, feedback resistive network can not also be changed, make voltage VF constant, only invalid current-sharing electric current outer shroud, does not namely increase feedback resistance branch road R28, R29, R30.
As other execution modes, the circuit in background technology shown in Fig. 3 can also be adopted, regulate feedback resistive network by Single-chip Controlling, make the reduction of parallel resistance resistance.
In above embodiment, transformer testing circuit is connected on the secondary of voltage regulating transformer in current transformer, gathers secondary voltage, as other execution modes, also transformer testing circuit can be connected to the former limit of voltage regulating transformer in current transformer, gathers original edge voltage.
Charge power supply parallel circuits above in all embodiments can not only be used for electric motor car, also may be used for the field that other need large current charge.
Owing to all relating to power module in above parallel circuits embodiment, therefore introduce no longer separately power module embodiment.
Be presented above and the present invention relates to concrete execution mode, but the present invention is not limited to described execution mode.Under the thinking that the present invention provides; the mode easily expected to those skilled in the art is adopted to convert the technological means in above-described embodiment, replace, revise; and the effect played goal of the invention that is substantially identical with the relevant art means in the present invention, that realize is also substantially identical; the technical scheme of such formation is carried out fine setting to above-described embodiment and is formed, and this technical scheme still falls within the scope of protection of the present invention.
Claims (10)
1. a charging power modules parallel circuits, comprise at least two switch power modules in parallel, switch power module comprises main circuit unit and control unit, control circuit comprises voltage detecting circuit, the outer loop circuit of current-sharing electric current, voltage inter-loop circuit, anti-dieback circuit unit and pwm circuit unit, voltage detecting circuit is for detecting the voltage of the voltage regulating transformer in main circuit, described anti-dieback circuit unit sampling connects described voltage detecting circuit, described pwm circuit is for controlling the current transformer in main circuit, it is characterized in that, described anti-dieback circuit unit controls the outer loop circuit of described current-sharing electric current, when the voltage of voltage regulating transformer is lower than set point, the outer loop circuit of invalid described current-sharing electric current, when the voltage of voltage regulating transformer is higher than set point, the outer loop circuit of effective described current-sharing electric current.
2. charging power modules parallel circuits according to claim 1, it is characterized in that, the outer loop circuit of described current-sharing electric current comprises an operational amplifier (U11B), two inputs of this operational amplifier (U11B) are respectively used to the current output signal (IF) and the current-sharing signal (CS) that connect corresponding power module, output is used for being connected to outer voltage circuit, described anti-dieback circuit unit controls a switching tube (Q5), and this switching tube is located between described current-sharing signal (CS) and operational amplifier (U15B); Or between the current output signal of corresponding power module (IF) and operational amplifier (U15B), or operational amplifier (U11B) exports between outer voltage circuit.
3. charging power modules parallel circuits according to claim 1, is characterized in that, described voltage detecting circuit sampling connects former limit or the secondary of the voltage regulating transformer in described main circuit.
4. charging power modules parallel circuits according to claim 1, it is characterized in that, described voltage inter-loop circuit connects voltage feedback signal, voltage feedback signal takes from parallel feedback resistance circuit, described parallel feedback resistance circuit is made up of feedback network branch resistance (R12) and resistance branch (R28, R29, R30) in parallel with it, and in resistance branch, string is provided with the switching tube (V2) being controlled by described anti-dieback circuit unit.
5. charging power modules parallel circuits according to claim 1, is characterized in that, described switching tube Q5 is triode or MOSFET.
6. a charging power modules, switch power module comprises main circuit unit and control unit, control circuit comprises voltage detecting circuit, the outer loop circuit of current-sharing electric current, voltage inter-loop circuit, anti-dieback circuit unit and pwm circuit unit, voltage detecting circuit is for detecting the voltage of the voltage regulating transformer in main circuit, described anti-dieback circuit unit sampling connects described voltage detecting circuit, described pwm circuit is for controlling the current transformer in main circuit, it is characterized in that, described anti-dieback circuit unit controls the outer loop circuit of described current-sharing electric current, when the voltage of voltage regulating transformer is lower than set point, the outer loop circuit of invalid described current-sharing electric current, when the voltage of voltage regulating transformer is higher than set point, the outer loop circuit of effective described current-sharing electric current.
7. charging power modules according to claim 6, it is characterized in that, the outer loop circuit of described current-sharing electric current comprises an operational amplifier (U11B), two inputs of this operational amplifier (U11B) are respectively used to the current output signal (IF) and the current-sharing signal (CS) that connect corresponding power module, output is used for being connected to outer voltage circuit, described anti-dieback circuit unit controls a switching tube (Q5), and this switching tube is located between described current-sharing signal (CS) and operational amplifier (U15B); Or between the current output signal of corresponding power module (IF) and operational amplifier (U15B), or operational amplifier (U11B) exports between outer voltage circuit.
8. charging power modules according to claim 6, is characterized in that, described voltage detecting circuit sampling connects former limit or the secondary of the voltage regulating transformer in described main circuit.
9. charging power modules according to claim 6, it is characterized in that, described voltage inter-loop circuit connects voltage feedback signal, voltage feedback signal takes from parallel feedback resistance circuit, described parallel feedback resistance circuit is made up of feedback network branch resistance (R12) and resistance branch (R28, R29, R30) in parallel with it, and in resistance branch, string is provided with the switching tube (V2) being controlled by described anti-dieback circuit unit.
10. charging power modules according to claim 6, is characterized in that, described switching tube Q5 is triode or MOSFET.
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| CN201510422290.3A CN105186877B (en) | 2015-07-17 | 2015-07-17 | A kind of charging power modules parallel circuit and its power module |
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