CN106891737A

CN106891737A - The control method of electric automobile and its onboard charger and onboard charger

Info

Publication number: CN106891737A
Application number: CN201510955366.9A
Authority: CN
Inventors: 王兴辉
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2015-12-18
Filing date: 2015-12-18
Publication date: 2017-06-27
Anticipated expiration: 2035-12-18
Also published as: WO2017101832A1; CN106891737B

Abstract

The invention discloses a kind of electric automobile and its control method of onboard charger and onboard charger, wherein, control method is comprised the following steps：When power battery charging, the charging setting time Tx of control H bridges in the first way and in a second manner charging setting time Ty of control H bridges are obtained；Alternately control is carried out to H bridges according to Tx and Ty carries out temperature equalization control with to first to fourth switching tube；When electrokinetic cell externally discharges, obtain electric discharge total time TC of control H bridges in the first way and control the electric discharge total time TD of H bridges in a second manner, and obtain setting time Tm of the electric discharge in each discharge cycles and electric discharge setting time Tn；The mode that relation selection according to TC and TD is controlled H bridges when externally electric discharge starts, and to H bridges, alternately control carries out temperature equalization control with to the to the 4th switching tube according to Tm and Tn, so that the heating relative equilibrium of first to fourth switching tube in H bridges, improves the working life of H bridge breaker in middle pipes.

Description

The control method of electric automobile and its onboard charger and onboard charger

Technical field

The present invention relates to electric vehicle engineering field, more particularly to a kind of control method of onboard charger of electric car, one kind Onboard charger of electric car and a kind of electric automobile.

Background technology

Progress is commercialized along with electric automobile, onboard charger of electric car has turned into one of electric automobile important spare part.

Wherein, by controlling onboard charger to charge vehicle and the method that vehicle externally discharges is had a lot, and it is related Mostly using the control method of single-phase H bridges in technology, and Bipolar control side is generally comprised using the control method of single-phase H bridges Method and unipolar control method.

But, during using ambipolar control method, 4 switching tubes in H bridges all in HF switch state, switching loss compared with Height, the thermal losses of generation is larger；During using unipolar control method, although can solve to a certain extent using bipolarity control Switching tube thermal losses during method processed, but in always controlling H bridges during vehicle charge or discharge according to fixed form Four switching tubes, partial switch pipe needs belt current to turn off in H bridges, and the problems of excessive heat of the switching tube of belt current shut-off can not Effectively solved.

Therefore, no matter using ambipolar control method or unipolar control method, can not effectively solve the switch in H bridges The heating problem of pipe, influences the working life of switching tube.

The content of the invention

It is contemplated that at least solving one of technical problem in above-mentioned technology to a certain extent.Therefore, of the invention first Individual purpose is to propose a kind of control method of onboard charger of electric car, enables to first to fourth switch in H bridges The heating relative equilibrium of pipe, improves the working life of H bridge breaker in middle pipes.

Second object of the present invention is to propose a kind of onboard charger of electric car.Third object of the present invention is to carry Go out a kind of electric automobile.

To reach above-mentioned purpose, one aspect of the present invention embodiment proposes a kind of control method of onboard charger of electric car, The onboard charger includes H bridges, and the H bridges are by first switch pipe, second switch pipe, the 3rd switching tube and the 4th switch Pipe is constituted, and the control method is comprised the following steps：When the onboard charger is every time to the electrokinetic cell of the electric automobile When being charged, acquisition controls the charging of the H bridges to set time Tx and control the H bridges in a second manner in the first way Charging set time Ty；Alternately control is carried out to the H bridges according to Tx and Ty to be opened with to the first switch pipe, second Guan Guan, the 3rd switching tube and the 4th switching tube carry out temperature equalization control；When the electrokinetic cell of the electric automobile passes through every time When the onboard charger is externally discharged, acquisition controls electric discharge total time TC of the H bridges and with second in the first way Mode controls the electric discharge total time TD of the H bridges, and obtain in the discharge process of the electrokinetic cell in each discharge cycles with The first method controls the electric discharge setting time Tm of the H bridges and controls the electric discharge of the H bridges to set with the second method Time Tn, and judge the relation between electric discharge total time TC and electric discharge total time TD；It is total according to the electric discharge Relation between time TC and electric discharge total time TD selects the onboard charger externally to discharge when starting to the H bridges The mode being controlled, and the H bridges are carried out according to Tm and Tn alternately control to be opened with to the first switch pipe, second Guan Guan, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.

The control method of onboard charger of electric car according to embodiments of the present invention, when power battery charging, obtains with the One mode controls the charging setting time Tx of H bridges and controls the charging of H bridges to set time Ty in a second manner, and according to Tx Alternately control is carried out to H bridges with Ty carries out temperature with to first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube Degree Balance route；When electrokinetic cell discharges, electric discharge total time TC and in a second manner of control H bridges in the first way is obtained The electric discharge total time TD of H bridges is controlled, and is obtained in the discharge process of electrokinetic cell and is controlled in the first way in each discharge cycles The electric discharge setting time Tm of H bridges and the in a second manner electric discharge of control H bridges set time Tn, and judge between TC and TD Relation, and the side that is controlled to H bridges when starting of externally being discharged according to the relation selection onboard charger between TC and TD Formula, and alternately control is carried out to H bridges with to first switch pipe, second switch pipe, the 3rd switching tube and the according to Tm and Tn Four switching tubes carry out temperature equalization control.So that the heating relative equilibrium of each switching tube, improves H bridge breaker in middle pipes Working life, and then extend the life cycle of onboard charger.

To reach above-mentioned purpose, a kind of onboard charger of electric car that another aspect of the present invention embodiment is proposed, including：H Bridge, the H bridges are made up of first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube；Control module, institute State when electrokinetic cell of the control module in the onboard charger every time to the electric automobile charges for obtaining with first Mode controls the charging setting time Tx of the H bridges and controls the charging of the H bridges to set time Ty in a second manner, and According to Tx and Ty to the H bridges carry out alternately control with to the first switch pipe, second switch pipe, the 3rd switching tube and 4th switching tube carries out temperature equalization control, and electrokinetic cell in the electric automobile passes through the onboard charger every time Externally it is additionally operable to obtain electric discharge total time TC for controlling the H bridges in the first way when being discharged and controls institute in a second manner The electric discharge total time TD of H bridges is stated, and is obtained in the discharge process of the electrokinetic cell in each discharge cycles with the first party Formula controls the electric discharge setting time Tm of the H bridges and controls the electric discharge of the H bridges to set time Tn with the second method, And judge it is described electric discharge total time TC and electric discharge total time TD between relation and according to it is described electric discharge total time TC with Relation between electric discharge total time TD selects the onboard charger externally to discharge what is be controlled to the H bridges when starting Mode, and alternately control is carried out to the H bridges with to the first switch pipe, second switch pipe, the 3rd according to Tm and Tn Switching tube and the 4th switching tube carry out temperature equalization control.

Onboard charger of electric car according to embodiments of the present invention, when power battery charging, control module is obtained with first Mode control H bridges charging setting time Tx and in a second manner the charging of control H bridges time Ty is set, and according to Tx and Ty carries out alternately control to H bridges and enters trip temperature with to first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube Balance route, and when electrokinetic cell discharges, control module be additionally operable to obtain control H bridges in the first way electric discharge it is total when Between TC and control the electric discharge total time TD of H bridges in a second manner, and each electric discharge is followed in obtaining the discharge process of electrokinetic cell The electric discharge setting time Tm of control H bridges and in a second manner the electric discharge setting time Tn of control H bridges in the first way in ring, And the relation for judging between TC and TD, and externally discharged startup according to the relation selection onboard charger between TC and TD When the mode that is controlled to H bridges, and alternately control carried out to H bridges according to Tm and Tn opened with to first switch pipe, second Guan Guan, the 3rd switching tube and the 4th switching tube carry out temperature equalization control so that the heating relative equilibrium of each switching tube, carry The working life of H bridges breaker in middle pipe high, so as to extend the life cycle of onboard charger.

Additionally, embodiments of the invention also proposed a kind of electric automobile, it includes above-mentioned onboard charger of electric car.

The electric automobile of the embodiment of the present invention, when electrokinetic cell is charged and discharged by above-mentioned onboard charger, energy It is enough to realize carrying out temperature equalization control to the first switch pipe in H bridges, second switch pipe, the 3rd switching tube and the 4th switching tube, So that the heating relative equilibrium of each switching tube, improves the working life of H bridge breaker in middle pipes, so as to extend onboard charger Life cycle.

Brief description of the drawings

Figure 1A is the circuit diagram of the onboard charger of electric car according to one embodiment of the invention；

Figure 1B is the circuit diagram of the onboard charger of electric car according to another embodiment of the present invention；

Fig. 1 C are the circuit diagram of the onboard charger of electric car according to another embodiment of the invention；

Fig. 2 is the flow chart of the control method of the onboard charger of electric car according to the embodiment of the present invention；

Fig. 3 is that H bridges are controlled during with to power battery charging according to the first method that uses of one embodiment of the invention Four control waveform diagrams of switching tube；

Fig. 4 is that H bridges are controlled during with to power battery charging according to the second method that uses of one embodiment of the invention Four control waveform diagrams of switching tube；

Fig. 5 be according to the present invention one specific embodiment by onboard charger to power battery charging when control flow chart；

Fig. 6 is to be controlled such that electrokinetic cell externally discharges to H bridges according to the use first method of one embodiment of the invention When four switching tubes control waveform diagram；

Fig. 7 is to be controlled such that electrokinetic cell externally discharges to H bridges according to the use second method of one embodiment of the invention When four switching tubes control waveform diagram；And

Fig. 8 is control flow when externally being discharged by onboard charger according to one electrokinetic cell of specific embodiment of the present invention Figure.

Specific embodiment

Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein identical from start to finish Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing The embodiment stated is exemplary, it is intended to for explaining the present invention, and be not considered as limiting the invention.

With reference to the accompanying drawings come describe the embodiment of the present invention proposition onboard charger of electric car control method, electronic vapour Car onboard charger and the electric automobile with the onboard charger.

As shown in figures 1A-c, onboard charger of electric car according to embodiments of the present invention include H bridges, H bridges by First switch pipe T1, second switch pipe T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4 are constituted.Wherein, such as Figure 1A institutes Show, the onboard charger of electric car includes the one of the first inductance L1 and the second inductance L2, the first inductance L1 and load The positive terminal of end or AC network AC is connected, the negative pole end of the other end or AC network AC of the second inductance L2 and load It is connected；As shown in Figure 1B, the onboard charger of electric car only includes an inductance such as the first inductance L1, the first electricity Sense L1 is connected with one end of load or the positive terminal of AC network AC；As shown in Figure 1 C, the vehicle-mounted charging of the electric automobile Device only includes inductance such as first inductance a L1, the first inductance L1 with the other end of load or bearing for AC network AC It is extreme to be connected.When onboard charger charges to the electrokinetic cell of electric automobile, electricity can be provided by AC network AC Energy；Can be that grid-connected electric discharge discharges into AC network AC when electrokinetic cell is externally discharged by onboard charger, It can also be off-network inversion i.e. inversion powering load.

Also, as shown in Fig. 2 the control method of the onboard charger of electric car of the embodiment of the present invention is comprised the following steps：

S1, when electrokinetic cell of the onboard charger every time to electric automobile charges, obtains and controls H bridges in the first way Charging setting time Tx and in a second manner control H bridges charging set time Ty.

According to one embodiment of present invention, as shown in figure 3, in the first way A control H bridges when, wherein, when supply car When the power network instantaneous voltage for carrying charger is more than 0, control first switch pipe T1 is in opening state always, and controls second to open Close pipe T2 and be in off state always, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, Wherein, when controlling the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 to turn on and off, the 3rd switch transistor T 3 is controlled PWM waveform and the 4th switch transistor T 4 PWM waveform it is complementary, and the PWM waveform of the 3rd switch transistor T 3 of control dutycycle Become again from diminishing greatly big, control the dutycycle of the PWM waveform of the 4th switch transistor T 4 to diminish again greatly from small change；Filled when supply is vehicle-mounted When the power network instantaneous voltage of electrical equipment is less than 0, control the 3rd switchs T3 and is in opening state always, and controls the 4th switching tube T4 is in off state always, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries are turned on and off, its In, when controlling first switch pipe T1 and second switch pipe T2 alternating, complementaries to turn on and off, control first switch pipe T1's The PWM waveform of PWM waveform and second switch pipe T2 is complementary, and the PWM waveform of control first switch pipe T1 dutycycle from Diminishing greatly, it is big become again, and the dutycycle of the PWM waveform of control second switch pipe T2 diminishes greatly again from small change.

Also, as shown in figure 4, in a second manner B control H bridges when, wherein, when supply onboard charger power network it is instantaneous When voltage is more than 0, control second switch pipe T2 is in opening state always, and controls first switch pipe T1 to be in close always Disconnected state, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, wherein, in control the When three switch transistor Ts 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, the PWM waveform and the of the 3rd switch transistor T 3 is controlled The PWM waveform of four switch transistor Ts 4 is complementary, and the dutycycle of the PWM waveform of the 3rd switch transistor T 3 of control diminishes greatly again from small change, Control the 4th switch transistor T 4 PWM waveform dutycycle from it is big diminish become again it is big；When the power network of supply onboard charger is instantaneously electric Press during less than 0, the switch transistor T 4 of control the 4th is in and turns off always in opening state always, and the switch transistor T 3 of control the 3rd State, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries are turned on and off, wherein, in control first When switch transistor T 1 and second switch pipe T2 alternating, complementaries are turned on and off, the PWM waveform and second of control first switch pipe T1 The PWM waveform of switch transistor T 2 is complementary, and the dutycycle of the PWM waveform of control first switch pipe T1 diminishes greatly again from small change, The dutycycle of the PWM waveform of control second switch pipe T2 become again big from diminishing greatly.

S2, according to Tx and Ty to H bridges carry out alternately control with to first switch pipe, second switch pipe, the 3rd switching tube and 4th switching tube carries out temperature equalization control.

, wherein it is desired to explanation, during onboard charger is to power battery charging, if only with first Mode A is controlled to H bridges, and when line voltage instantaneous value is more than 0, first switch pipe T1 keeps open-minded always, the Two switch transistor Ts 2 are kept turning off always, and the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, and Open in the 3rd switch transistor T 3, induction charging when the 4th switch transistor T 4 is turned off in onboard charger, in the 3rd switch Inductive discharge when pipe T3 shut-offs, the 4th switch transistor T 4 are opened；When line voltage instantaneous value is less than 0, the 3rd switching tube T3 keeps open-minded always, and the 4th switch transistor T 4 keeps turning off always, and first switch pipe T1 and second switch pipe T2 replaces Complementation is turned on and off, and open in first switch pipe T1, electricity when second switch pipe T2 is turned off in onboard charger Sense is charged, the inductive discharge when first switch pipe T1 shut-offs, second switch pipe T2 are opened.Due to first switch pipe T1 To induction charging when being opened with the 3rd switch transistor T 3, it is larger to open dutycycle, therefore first switch pipe T1, the 3rd switch Pipe T3 can be overheated.

Similarly, during onboard charger is to power battery charging, if only with second method B to H bridges It is controlled, when line voltage instantaneous value is more than 0, first switch pipe T1 keeps turning off always, second switch pipe T2 Keep open-minded always, the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, and in the 4th switch Induction charging when pipe T4 is opened, the 3rd switch transistor T 3 is turned off in onboard charger, turn off in the 4th switch transistor T 4, Inductive discharge when 3rd switch transistor T 3 is opened；When line voltage instantaneous value is less than 0, the 4th switch transistor T 4 keeps always Open-minded, the 3rd switch transistor T 3 keeps turning off always, first switch pipe T1 and second switch pipe T2 alternating, complementaries open and Shut-off, and open in second switch pipe T2, induction charging when first switch pipe T1 is turned off in onboard charger, Inductive discharge when second switch pipe T2 shut-offs, first switch pipe T1 are opened.Because second switch pipe T2 and the 4th is switched Pipe T4 is to induction charging when opening, and it is larger to open dutycycle, therefore second switch pipe T2, the 4th switch transistor T 4 were understood Heat.

Therefore, in an embodiment of the present invention, when onboard charger charges to electrokinetic cell every time, Tx is first set And Ty, then during to power battery charging, car first can be controlled such that to H bridges using first method A Charger is carried to power battery charging, until reaching Tx to the time that H bridges are controlled using first method A, is switched Onboard charger is controlled such that to power battery charging to H bridges to using second method B, until using second party Formula B reaches Ty to the time that H bridges are controlled, and so completes charging cycle (i.e. one charge cycle time =Tx+Ty), then be switched to onboard charger is controlled such that to power battery charging to H bridges using first method A, Until reaching Tx to the time that H bridges are controlled using first method A, then switch to using second method B to H Bridge is controlled such that onboard charger to power battery charging, until H bridges are controlled using second method B Time reaches Ty ... ..., is so repeated, realize to H bridges carry out alternately control so that realize to first switch pipe, Second switch pipe, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.Certainly, in the mistake to power battery charging Cheng Zhong, also first can be controlled such that onboard charger to power battery charging using second method B to H bridges, until Ty is reached to the time that H bridges are controlled using second method B, is switched to H bridges are controlled using first method A Make so that onboard charger is to power battery charging, until being reached to the time that H bridges are controlled using first method A Tx, so completes a charging cycle, and is repeated according to such charging cycle, until power battery charging is complete Into.

Say, alternately control is carried out to H bridges according to Tx and Ty in above-mentioned steps S2, including：When using first method When controlling the time of H bridges to reach Tx, H bridges are controlled using second method, until using second method control H bridges Time reaches Ty；Or when Ty is reached using the time of second method control H bridges, H bridges are carried out using first method Control, until reaching Tx using the time of first method control H bridges.

According to one embodiment of present invention, charging setting time Tx of control H bridges can be equal in a second manner in the first way Control the charging of H bridges that time Ty is set.

Specifically, according to one embodiment of present invention, as shown in figure 5, above-mentioned onboard charger of electric car Control method is comprised the following steps：

Ripple is opened in S501, charging, i.e., it is necessary to output control waveform comes in H bridges when onboard charger is to power battery charging Switching tube be controlled.

S502, sets Tx and Ty.

S503, is controlled such that onboard charger charges to electrokinetic cell using first method A to H bridges, and Judge whether this charging terminates in charging process, if it is, terminate flow, if not, return to continue to judge.

Whether S504, judges reach Tx using the time of first method A control H bridges.If it is, performing step S505； If not, return to step S503.

S505, is controlled such that onboard charger charges to electrokinetic cell using second method B to H bridges, and Judge whether this charging terminates in charging process, if it is, terminate flow, if not, return to continue to judge.

Whether S506, judges reach Ty using the time of second method B control H bridges.If it is, return performing step S503； If not, return to step S505.

Therefore, the control method of the onboard charger of electric car of the embodiment of the present invention can make onboard charger every time to power Ensure first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube heating relative equilibrium in battery charging process, Improve the working life of onboard charger.

S3, when the electrokinetic cell of electric automobile is externally discharged by onboard charger every time, acquisition is controlled in the first way Electric discharge total time TC of H bridges processed and in a second manner the electric discharge total time TD of control H bridges, and obtain the electric discharge of electrokinetic cell During the electric discharge setting time Tm of control H bridges and control putting for H bridges in a second manner in the first way in each discharge cycles Electric setting time Tn, and judge the relation between electric discharge total time TC and electric discharge total time TD.

According to one embodiment of present invention, as shown in fig. 6, in the first way A control H bridges when, wherein, filled when vehicle-mounted When the external electric discharge instantaneous voltage of electrical equipment is more than 0, control first switch pipe T1 is in opening state always, and controls second to open Close pipe T2 and be in off state always, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, Wherein, when controlling the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 to turn on and off, the 3rd switch transistor T 3 is controlled PWM waveform and the 4th switch transistor T 4 PWM waveform it is complementary, and the PWM waveform of the 3rd switch transistor T 3 of control dutycycle Become again from diminishing greatly big, control the dutycycle of the PWM waveform of the 4th switch transistor T 4 to diminish again greatly from small change；Work as onboard charger External electric discharge instantaneous voltage when being less than 0, the switch transistor T 3 of control the 3rd controls the 4th switching tube in opening state always T4 is in off state always, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries are turned on and off, its In, when controlling first switch pipe T1 and second switch pipe T2 alternating, complementaries to turn on and off, control first switch pipe T1's The PWM waveform of PWM waveform and second switch pipe T2 is complementary, and the PWM waveform of control first switch pipe T1 dutycycle from Diminishing greatly, it is big become again, and the dutycycle of the PWM waveform of control second switch pipe T2 diminishes greatly again from small change.

Also, as shown in fig. 7, in a second manner B control H bridges when, wherein, when the external electric discharge of onboard charger is instantaneous When voltage is more than 0, control second switch pipe T2 is in opening state always, and controls first switch pipe T1 to be in close always Disconnected state, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, wherein, in control the When three switch transistor Ts 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, the PWM waveform and the of the 3rd switch transistor T 3 is controlled The PWM waveform of four switch transistor Ts 4 is complementary, and the dutycycle of the PWM waveform of the 3rd switch transistor T 3 of control diminishes greatly again from small change, Control the 4th switch transistor T 4 PWM waveform dutycycle from it is big diminish become again it is big；When the external electric discharge of onboard charger is instantaneously electric Press during less than 0, the switch transistor T 4 of control the 4th is in and turns off always in opening state always, and the switch transistor T 3 of control the 3rd State, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries are turned on and off, wherein, in control first When switch transistor T 1 and second switch pipe T2 alternating, complementaries are turned on and off, the PWM waveform and second of control first switch pipe T1 The PWM waveform of switch transistor T 2 is complementary, and the dutycycle of the PWM waveform of control first switch pipe T1 diminishes greatly again from small change, The dutycycle of the PWM waveform of control second switch pipe T2 become again big from diminishing greatly.

S4, according to electric discharge total time TC and electric discharge total time TD between relation selection onboard charger externally discharge startup when The mode being controlled to H bridges, and alternately control is carried out to H bridges with to first switch pipe, second switch according to Tm and Tn Pipe, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.

, wherein it is desired to explanation, during electrokinetic cell is by onboard charger externally electric discharge, if only adopted H bridges are controlled with first method A, when external discharge voltage instantaneous value is more than 0, first switch pipe T1 keeps one Head straight for leading to, second switch pipe T2 keeps turning off always, and the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 are open-minded And shut-off, and turn off in the 3rd switch transistor T 3, induction charging when the 4th switch transistor T 4 is opened in onboard charger, Open in the 3rd switch transistor T 3, inductive discharge when the 4th switch transistor T 4 is turned off；External discharge voltage instantaneous value is less than 0 When, the 3rd switch transistor T 3 keeps open-minded always, and the 4th switch transistor T 4 keeps turning off always, first switch pipe T1 and The alternating, complementary of two switch transistor T 2 is turned on and off, and first switch pipe T1 shut-off, second switch pipe T2 open when car The induction charging in charger is carried, is opened in first switch pipe T1, inductive discharge when second switch pipe T2 is turned off.By To induction charging when second switch pipe T2 and the 4th switch transistor T 4 are opened, so the switches of second switch pipe T2 and the 4th Pipe T4 belt currents are turned off, and carry out hard switching, therefore second switch pipe T2 and the 4th switch transistor T 4 occur superheating phenomenon.

Similarly, during electrokinetic cell is by onboard charger externally electric discharge, if only with second method B H bridges are controlled, when external discharge voltage instantaneous value is more than 0, first switch pipe T1 keeps turning off always, second Switch transistor T 2 keeps open-minded always, and the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, and Induction charging when 4th switch transistor T 4 is turned off, the 3rd switch transistor T 3 is opened in onboard charger, in the 4th switching tube Inductive discharge when T4 is opened, the 3rd switch transistor T 3 is turned off；When external discharge voltage instantaneous value is less than 0, the 4th switching tube T4 keeps open-minded always, and the 3rd switch transistor T 3 keeps turning off always, and first switch pipe T1 and second switch pipe T2 replaces Complementation is turned on and off, and the electricity when second switch pipe T2 shut-offs, first switch pipe T1 are opened in onboard charger Sense is charged, and is opened in second switch pipe T2, inductive discharge when first switch pipe T1 is turned off.Due to first switch pipe T1 To induction charging when being opened with the 3rd switch transistor T 3, so first switch pipe T1 and the shut-off of the belt current of the 3rd switch transistor T 3, Hard switching is carried out, therefore first switch pipe T1 and the 3rd switch transistor T 3 occur superheating phenomenon.

Therefore, in an embodiment of the present invention, electrokinetic cell passes through to be controlled such that to H bridges using first method A When onboard charger externally discharges, time for being controlled to H bridges using first method A of record so that it is available with First method A controls the electric discharge total time TC of H bridges, is then stored；H bridges are controlled using second method B During so that electrokinetic cell externally being discharged by onboard charger, record using second method B H bridges are controlled when Between, so that available B in a second manner controls the electric discharge total time TD of H bridges, then stored.Then in power electric When pond is externally discharged by onboard charger every time, the relation between electric discharge total time TC and electric discharge total time TD is judged, Externally discharged finally according to the relation selection onboard charger between electric discharge total time TC and electric discharge total time TD when starting to H The mode that bridge is controlled.

Specifically, according to one embodiment of present invention, according to the relation between electric discharge total time TC and electric discharge total time TD Selection onboard charger externally discharge the mode being controlled to H bridges when starting when, wherein, when electric discharge total time TC is more than putting During electric total time TD, when onboard charger externally discharges startup, selection second method is controlled to H bridges, until electric discharge is total Time TC is equal to electric discharge total time TD；It is external in onboard charger when total time TC of discharging is less than electric discharge total time TD Selection first method is controlled to H bridges when electric discharge starts, until electric discharge total time TC is equal to electric discharge total time TD；When putting When electric total time TC is equal to electric discharge total time TD, first method or second party are selected when onboard charger externally discharges startup Formula carries out alternately control to H bridges with according to Tm and Tn.

Wherein, alternately control is carried out to H bridges according to Tm and Tn, including：Reached when using the time of first method control H bridges During to Tm, H bridges are controlled using second method, until reaching Tn using the time of second method control H bridges；Or Person is controlled using first method when Tn is reached using the time of second method control H bridges to H bridges, until using the One mode controls the time of H bridges to reach Tm.

That is, before electrokinetic cell is started by the external electric discharge of onboard charger, being obtained with first from storage region Mode controls electric discharge total time TC of H bridges and controls the electric discharge total time TD of H bridges in a second manner, then sets Tm and Tn, Then electric discharge total time TC and electric discharge are judged total time TD determine it is first to use first method according to judged result To control H bridges that H bridges are still first controlled using the second control mode, i.e., obtained from storage region and control H bridges in the first way Electric discharge total time TC and in a second manner control H bridges electric discharge total time TD, and to electric discharge total time TC and discharge it is total when Between the side to the control of H bridges that first selects when being and confirming that onboard charger electric discharge starts of the purpose that is judged of relation between TD Formula.If for example, TC=20 minutes got, TD=18 minutes, second method B is first selected when this discharges to H Bridge is controlled such that electrokinetic cell is externally discharged by onboard charger, and is switched to uses first method after the 2 minutes A is controlled such that electrokinetic cell is externally discharged by onboard charger to H bridges, until using first method A to H The time that bridge is controlled reaches Tm, then is switched to and is controlled such that electrokinetic cell leads to H bridges using second method B Onboard charger is crossed externally to discharge, until Tn is reached to the time that H bridges are controlled using second method B, it is so complete Into a discharge cycles (i.e. one discharge cycles time=Tm+Tn), then it is switched to enter H bridges using first method A Row is controlled so that electrokinetic cell is externally discharged by onboard charger, until being controlled to H bridges using first method A Time reach Tm, then switch to be controlled such that H bridges electrokinetic cell is filled by vehicle-mounted using second method B Electrical equipment externally discharges, until reaching Tn to the time that H bridges are controlled using second method B ... ..., so repeatedly Carry out, realize carrying out H bridges alternately control, so as to realize to first switch pipe, second switch pipe, the 3rd switching tube and the Four switching tubes carry out temperature equalization control.And if TC=18 minutes got, TD=20 minutes, then when this discharges First selection first method A is controlled such that electrokinetic cell is externally discharged by onboard charger to H bridges, and at 2 minutes After be switched to electrokinetic cell is externally discharged by onboard charger to be controlled such that to H bridges using second method B, until Tn is reached to the time that H bridges are controlled using second method B, then is switched to H bridges are carried out using first method A Control so that electrokinetic cell is externally discharged by onboard charger, until H bridges are controlled using first method A Time reaches Tm, so completes a discharge cycles (i.e. one discharge cycles time=Tm+Tn), then be switched to use Second method B is controlled such that electrokinetic cell is externally discharged by onboard charger to H bridges, until using second party Formula B reaches Tn to the time that H bridges are controlled, and then switches to be controlled such that H bridges using first method A Electrokinetic cell is externally discharged by onboard charger, until being reached to the time that H bridges are controlled using first method A Tm ... ..., is so repeated, and realizes carrying out H bridges alternately control, so as to realize opening first switch pipe, second Guan Guan, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.

Certainly, when electric discharge total time TD is equal to electric discharge total times TC for getting, can when onboard charger discharges and starts Electrokinetic cell is externally discharged by onboard charger first directly to be controlled such that to H bridges using first method A, until Tm is reached to the time that H bridges are controlled using first method A, is switched to H bridges are controlled using second method B Make so that electrokinetic cell is externally discharged by onboard charger, until using second method B H bridges are controlled when Between reach Tn, so complete a discharge cycles (i.e. one discharge cycles time=Tm+Tn), then be switched to and use the One mode A is controlled such that electrokinetic cell is externally discharged by onboard charger to H bridges, until using first method A Tm is reached to the time that H bridges are controlled, then switches to be controlled such that power to H bridges using second method B Battery is externally discharged by onboard charger, until being reached to the time that H bridges are controlled using second method B Tn ... ..., is so repeated, and realizes carrying out H bridges alternately control, so as to realize opening first switch pipe, second Guan Guan, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.Or, it is equal in the electric discharge total time TC for getting During electric discharge total time TD, also directly H bridges can be controlled using second method B first when onboard charger discharges and starts So that electrokinetic cell is externally discharged by onboard charger, until the time being controlled to H bridges using second method B Tn is reached, is switched to and electrokinetic cell is externally put by onboard charger to be controlled such that to H bridges using first method A Electricity, until reaching Tm to the time that H bridges are controlled using first method A, so completes a discharge cycles, and It is repeated according to such discharge cycles, until electrokinetic cell electric discharge terminates.

Wherein, chosen in each discharge cycles after mode just according to fixed form i.e. first method or second method control H Bridge discharges electrokinetic cell, and electric discharge total time is recorded during switching mode, for example, when controlling H bridges using first method in the ban, It is that this electric discharge is obtained when starting from storage region that what is recorded during switching mode controls the electric discharge total time of H bridges in the first way The electric discharge that in the first way controls H bridge of the electric discharge total time of control H bridges plus record in this discharge cycles in the first way Time.

In one embodiment of the invention, electric discharge setting time Tm of control H bridges can be equal in a second manner in the first way Control the electric discharge of H bridges that time Tn is set, so as to accurately control first switch pipe, second switch pipe, the 3rd switching tube and the Four switching tubes heating relative equilibrium.

Specifically, according to one embodiment of present invention, as shown in figure 8, above-mentioned onboard charger of electric car Control method is comprised the following steps：

Ripple is opened in S801, electric discharge, i.e., it is necessary to output control waveform is come to H when electrokinetic cell is externally discharged by onboard charger Switching tube in bridge is controlled.

S802, reads electric discharge total time TC of A controls H bridges in the first way and B controls the electric discharge of H bridges total in a second manner Time TD.

S803, sets Tm and Tn.

Whether S804, judge TC more than TD.If it is, performing step S805；If not, performing step S806.

S805, selection second method B is controlled to H bridges, until TC=TD, then performs step S808.

Whether S806, judge TC less than TD.If it is, performing step S807；If not, perform step S808 or S809。

S807, selection first method A is controlled to H bridges, until TC=TD, then performs step S809.

S808, is controlled such that electrokinetic cell is externally discharged by onboard charger using first method A to H bridges, And judge whether this electric discharge terminates in discharge process, if it is, terminate flow, if not, return to continue to judge.

S809, is controlled such that electrokinetic cell is externally discharged by onboard charger using second method B to H bridges, And judge whether this electric discharge terminates in discharge process, if it is, terminate flow, if not, return to continue to judge.

Whether S810, judges reach Tm using the time of first method A control H bridges.If it is, performing step S809； If not, return to step S808.

Whether S811, judges reach Tn using the time of second method B control H bridges.If it is, return performing step S808； If not, return to step S809.

Therefore, the control method of the onboard charger of electric car of the embodiment of the present invention can make electrokinetic cell every time by vehicle-mounted Ensure that the heating of first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube is relative in the external discharge process of charger Balance, improves the working life of onboard charger.

As shown in figures 1A-c, onboard charger of electric car according to embodiments of the present invention includes H bridges and control mould Block such as MCU (Micro Control Unit, microcontroller).Wherein, H bridges are opened by first switch pipe T1, second Pipe T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4 is closed to constitute.Control module is in onboard charger every time to electric automobile Charging when electrokinetic cell is charged for obtaining control H bridges in the first way sets time Tx and controls H in a second manner The charging of bridge sets time Ty, and alternately control is carried out to H bridges with to first switch pipe T1, second switch according to Tx and Ty Pipe T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4 carry out temperature equalization control, and every in the electrokinetic cell of electric automobile It is secondary to be additionally operable to obtain electric discharge total time TC of control H bridges in the first way when externally being discharged by onboard charger and with the Two modes control the electric discharge total time TD of H bridges, and obtain in the discharge process of electrokinetic cell in each discharge cycles with first party The electric discharge setting time Tm of formula control H bridges and the in a second manner electric discharge of control H bridges set time Tn, and judge electric discharge Total time TC and electric discharge total time TD between relation and according to electric discharge total time TC and electric discharge total time TD between relation Selection onboard charger externally discharges the mode that is controlled to H bridges when starting, and H bridges are replaced according to Tm and Tn Control carries out temperature equalization control with to first switch pipe T1, second switch pipe T2, the 3rd switch transistor T 3 and the 4th switch transistor T 4 System.

According to one embodiment of present invention, when control module carries out alternately control to H bridges according to Tx and Ty, wherein, when When reaching Tx using the time of first method control H bridges, H bridges are controlled using second method, until using second party The time of formula control H bridges reaches Ty；Or when Ty is reached using the time of second method control H bridges, using first party Formula is controlled to H bridges, until reaching Tx using the time of first method control H bridges.

That is, in an embodiment of the present invention, when onboard charger charges to electrokinetic cell every time, controlling mould Block first sets Tx and Ty, then during to power battery charging, H bridges can be carried out using first method A first Control so that onboard charger is to power battery charging, until being reached to the time that H bridges are controlled using first method A To Tx, it is switched to and onboard charger is controlled such that to power battery charging to H bridges using second method B, until Ty is reached to the time that H bridges are controlled using second method B, (i.e. one charging of a charging cycle is so completed Circulation time=Tx+Ty), then be switched to and be controlled such that onboard charger to power on H bridges using first method A Battery charges, until reaching Tx to the time that H bridges are controlled using first method A, then switches to use second Mode B is controlled such that onboard charger to power battery charging to H bridges, until using second method B to H bridges The time being controlled reaches Ty ... ..., is so repeated, and realizes carrying out H bridges alternately control, right so as to realize First switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.Certainly, to power During battery charges, also first onboard charger can be controlled such that to power electric H bridges using second method B Pond is charged, until reaching Ty to the time that H bridges are controlled using second method B, is switched to using first method A Onboard charger is controlled such that to power battery charging to H bridges, until being controlled to H bridges using first method A The time of system reaches Tx, so completes a charging cycle, and is repeated according to such charging cycle, until dynamic Power battery charging complete.

Wherein, the charging setting time Tx of control H bridges can be equal to the charging setting of control H bridges in a second manner in the first way Time Ty.

According to one embodiment of present invention, when control module controls H bridges in the first way, wherein, when supply vehicle-mounted charge When the power network instantaneous voltage of device is more than 0, control module control first switch pipe T1 is in opening state always, and controls second Switch transistor T 2 is in off state always, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are opened and closed It is disconnected, wherein, when controlling the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 to turn on and off, control the 3rd is switched The PWM waveform of the PWM waveform of pipe T3 and the 4th switch transistor T 4 is complementary, and controls accounting for for the PWM waveform of the 3rd switch transistor T 3 It is empty bigger than become again from diminishing greatly, control the dutycycle of the PWM waveform of the 4th switch transistor T 4 to diminish again greatly from small change；When supply car When the power network instantaneous voltage for carrying charger is less than 0, the switch transistor T 3 of control module control the 3rd is controlled in opening state always The 4th switch transistor T 4 is made to be opened in off state always, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries It is logical and turn off, wherein, when controlling first switch pipe T1 and second switch pipe T2 alternating, complementaries to turn on and off, control the The PWM waveform of one switch transistor T 1 and the PWM waveform of second switch pipe T2 are complementary, and control the PWM ripples of first switch pipe T1 The dutycycle of shape become again big from big diminishing, and the dutycycle of the PWM waveform of control second switch pipe T2 diminishes greatly again from small change.

Also, when control module controls H bridges in a second manner, wherein, when the power network instantaneous voltage of supply onboard charger is big When 0, control module control second switch pipe T2 is in opening state always, and controls first switch pipe T1 to be in always Off state, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, wherein, in control When 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, control the 3rd switch transistor T 3 PWM waveform and The PWM waveform of the 4th switch transistor T 4 is complementary, and the dutycycle of the PWM waveform of the 3rd switch transistor T 3 of control becomes greatly again from small change It is small, control the 4th switch transistor T 4 PWM waveform dutycycle from it is big diminish become again it is big；When the power network wink of supply onboard charger When voltage when being less than 0, the switch transistor T 4 of control module control the 4th controls the 3rd switch transistor T 3 in opening state always Turned on and off in off state always, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries, wherein, When controlling first switch pipe T1 and second switch pipe T2 alternating, complementaries to turn on and off, the PWM of control first switch pipe T1 The PWM waveform of waveform and second switch pipe T2 is complementary, and the PWM waveform of control first switch pipe T1 dutycycle from small change Diminish again greatly, the dutycycle of the PWM waveform of control second switch pipe T2 from it is big diminish become again it is big.

In an embodiment of the present invention, control module is controlled such that electrokinetic cell leads to H bridges using first method A When crossing onboard charger and externally discharging, the time that record is controlled using first method A to H bridges, so that available A controls the electric discharge total time TC of H bridges in the first way, is then stored；H bridges are controlled using second method B When system is so that electrokinetic cell is externally discharged by onboard charger, what record was controlled using second method B to H bridges Time, so that available B in a second manner controls the electric discharge total time TD of H bridges, then stored.Then in power When battery is externally discharged by onboard charger every time, the relation between electric discharge total time TC and electric discharge total time TD is judged, Externally discharged finally according to the relation selection onboard charger between electric discharge total time TC and electric discharge total time TD when starting to H The mode that bridge is controlled.

Specifically, according to one embodiment of present invention, control module according to electric discharge total time TC with electric discharge total time TD it Between relation selection onboard charger externally discharge start when H bridges are controlled mode when, wherein, when electric discharge total time When TC is more than electric discharge total time TD, control module selection second method when onboard charger externally discharges startup is entered to H bridges Row control, until electric discharge total time TC being equal to electric discharge total time TD；When total time TC of discharging is less than electric discharge total time TD, Control module selection first method when onboard charger externally discharges startup is controlled to H bridges, until electric discharge total time TC Equal to electric discharge total time TD；When total time TC of discharging electric discharge total time TD is equal to, control module is external in onboard charger Selection first method or second method carry out alternately control to H bridges with according to Tm and Tn when electric discharge starts.

Also, when control module carries out alternately control to H bridges according to Tm and Tn, wherein, when using first method control H When the time of bridge reaches Tm, H bridges are controlled using second method, until being reached using the time of second method control H bridges To Tn；Or when Tn is reached using the time of second method control H bridges, H bridges are controlled using first method, Until reaching Tm using the time of first method control H bridges.

According to one embodiment of present invention, when control module controls H bridges in the first way, wherein, when onboard charger When externally electric discharge instantaneous voltage is more than 0, control module control first switch pipe T1 is in opening state always, and controls second Switch transistor T 2 is in off state always, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are opened and closed It is disconnected, wherein, when controlling the 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 to turn on and off, control the 3rd is switched The PWM waveform of the PWM waveform of pipe T3 and the 4th switch transistor T 4 is complementary, and controls accounting for for the PWM waveform of the 3rd switch transistor T 3 It is empty bigger than become again from diminishing greatly, control the dutycycle of the PWM waveform of the 4th switch transistor T 4 to diminish again greatly from small change；Filled when vehicle-mounted When the external electric discharge instantaneous voltage of electrical equipment is less than 0, the switch transistor T 3 of control module control the 3rd is controlled in opening state always The 4th switch transistor T 4 is made to be opened in off state always, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries It is logical and turn off, wherein, when controlling first switch pipe T1 and second switch pipe T2 alternating, complementaries to turn on and off, control the The PWM waveform of one switch transistor T 1 and the PWM waveform of second switch pipe T2 are complementary, and control the PWM ripples of first switch pipe T1 The dutycycle of shape become again big from big diminishing, and the dutycycle of the PWM waveform of control second switch pipe T2 diminishes greatly again from small change.

Also, when control module controls H bridges in a second manner, wherein, when the external electric discharge instantaneous voltage of onboard charger is big When 0, control module control second switch pipe T2 is in opening state always, and controls first switch pipe T1 to be in always Off state, and the 3rd switch transistor T 3 of control and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, wherein, in control When 3rd switch transistor T 3 and the alternating, complementary of the 4th switch transistor T 4 are turned on and off, control the 3rd switch transistor T 3 PWM waveform and The PWM waveform of the 4th switch transistor T 4 is complementary, and the dutycycle of the PWM waveform of the 3rd switch transistor T 3 of control becomes greatly again from small change It is small, control the 4th switch transistor T 4 PWM waveform dutycycle from it is big diminish become again it is big；When the external electric discharge wink of onboard charger When voltage when being less than 0, the switch transistor T 4 of control module control the 4th controls the 3rd switch transistor T 3 in opening state always Turned on and off in off state always, and control first switch pipe T1 and second switch pipe T2 alternating, complementaries, wherein, When controlling first switch pipe T1 and second switch pipe T2 alternating, complementaries to turn on and off, the PWM of control first switch pipe T1 The PWM waveform of waveform and second switch pipe T2 is complementary, and the PWM waveform of control first switch pipe T1 dutycycle from small change Diminish again greatly, the dutycycle of the PWM waveform of control second switch pipe T2 from it is big diminish become again it is big.

In an embodiment of the present invention, as shown in Figure 1A or Figure 1B or Fig. 1 C, first switch pipe T1, second switch pipe T2, 3rd switch transistor T 3 and the 4th switch transistor T 4 are IGBT (Insulated Gate Bipolar Transistor, insulation Grid bipolar transistor), certainly, in other embodiments of the invention, first switch pipe T1, second switch pipe T2, Three switch transistor Ts 3 and the 4th switch transistor T 4 can also be metal-oxide-semiconductor.

According to one embodiment of present invention, electric discharge setting time Tm of control H bridges can be equal in a second manner in the first way Control the electric discharge of H bridges that time Tn is set, so as to accurately control first switch pipe, second switch pipe, the 3rd switching tube and the Four switching tubes heating relative equilibrium.

In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", the orientation or position relationship of the instruction such as " clockwise ", " counterclockwise ", " axial direction ", " radial direction ", " circumference " be based on Orientation shown in the drawings or position relationship, are for only for ease of and describe of the invention and simplify description, rather than instruction or hint institute The device or element of finger must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to this hair Bright limitation.

Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or implying relative importance Or the implicit quantity for indicating indicated technical characteristic.Thus, " first " is defined, the feature of " second " can be expressed Or implicitly include at least one this feature.In the description of the invention, " multiple " is meant that at least two, such as two It is individual, three etc., unless otherwise expressly limited specifically.

In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " Should be interpreted broadly Deng term, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be Mechanically connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be two The connection of individual element internal or two interaction relationships of element, unless otherwise clearly restriction.It is common for this area For technical staff, above-mentioned term concrete meaning in the present invention can be as the case may be understood.

In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can Being the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, the One feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or Oblique upper, or fisrt feature level height is merely representative of higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be fisrt feature immediately below second feature or obliquely downward, or to be merely representative of first special Level height is levied less than second feature.

In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. mean to combine the specific features of the embodiment or example description, structure, material or Feature is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term Necessarily it is directed to identical embodiment or example.And, the specific features of description, structure, material or feature can be with Combined in an appropriate manner in any one or more embodiments or example.Additionally, in the case of not conflicting, ability The technical staff in domain can enter the feature of the different embodiments or example described in this specification and different embodiments or example Row is combined and combined.

Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment be it is exemplary, It is not considered as limiting the invention, one of ordinary skill in the art within the scope of the invention can be to above-described embodiment It is changed, changes, replacing and modification.

Claims

1. a kind of control method of onboard charger of electric car, it is characterised in that the onboard charger includes H bridges, institute H bridges are stated to be made up of first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube, the control method include with Lower step：

When electrokinetic cell of the onboard charger every time to the electric automobile charges, acquisition is controlled in the first way The charging setting time Tx of the H bridges and control in a second manner the H bridges charging set time Ty；

Alternately control is carried out to the H bridges with to the first switch pipe, second switch pipe, the 3rd switch according to Tx and Ty Pipe and the 4th switching tube carry out temperature equalization control；

When the electrokinetic cell of the electric automobile is externally discharged by the onboard charger every time, obtain with first party Formula controls electric discharge total time TC of the H bridges and controls the electric discharge total time TD of the H bridges in a second manner, and obtains institute The interior electric discharge with the first method control H bridges of each discharge cycles sets time Tm in stating the discharge process of electrokinetic cell Time Tn is set with the electric discharge for controlling the H bridges with the second method, and judge it is described discharge total time TC with it is described Relation between electric discharge total time TD；

The onboard charger is selected externally to put according to the relation between electric discharge total time TC and electric discharge total time TD The mode being controlled to the H bridges when electrically activating, and alternately control is carried out to the H bridges with to described according to Tm and Tn First switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.

2. the control method of onboard charger of electric car as claimed in claim 1, it is characterised in that described according to Tx Alternately control is carried out to the H bridges with Ty, including：

When the time that the H bridges are controlled using the first method reaches Tx, the H bridges are entered using the second method Row control, until reaching Ty using the time of the second method control H bridges；Or

When the time that the H bridges are controlled using the second method reaches Ty, the H bridges are entered using the first method Row control, until reaching Tx using the time of the first method control H bridges.

3. the control method of onboard charger of electric car as claimed in claim 1, it is characterised in that described according to Tm Alternately control is carried out to the H bridges with Tn, including：

When the time that the H bridges are controlled using the first method reaches Tm, the H bridges are entered using the second method Row control, until reaching Tn using the time of the second method control H bridges；Or

When the time that the H bridges are controlled using the second method reaches Tn, the H bridges are entered using the first method Row control, until reaching Tm using the time of the first method control H bridges.

4. the control method of the onboard charger of electric car as any one of claim 1-3, it is characterised in that root The onboard charger is selected externally to discharge startup according to the relation between electric discharge total time TC and electric discharge total time TD When the H bridges are controlled mode when, wherein,

When the electric discharge total time TC electric discharge total time TD is more than, when the onboard charger externally discharges startup The second method is selected to be controlled the H bridges, until electric discharge total time TC is equal to electric discharge total time TD；

When the electric discharge total time TC electric discharge total time TD is less than, when the onboard charger externally discharges startup The first method is selected to be controlled the H bridges, until electric discharge total time TC is equal to electric discharge total time TD；

When the electric discharge total time TC electric discharge total time TD is equal to, when the onboard charger externally discharges startup Select the first method or the second method carries out alternately control to the H bridges with according to Tm and Tn.

5. the control method of the onboard charger of electric car as any one of claim 1-3, it is characterised in that with When the first method controls the H bridges, wherein,

When supplying the power network instantaneous voltage of the onboard charger more than 0 or the external electric discharge of the onboard charger is instantaneously electric Press during more than 0, control the first switch pipe in opening state always, and control the second switch pipe to be in and close always Disconnected state, and control the 3rd switching tube and the 4th switching tube alternating, complementary to turn on and off；

When supplying the power network instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneously electric Press during less than 0, control the 3rd switching tube in opening state always, and control the 4th switching tube to be in and close always Disconnected state, and control the first switch pipe and the second switch pipe alternating, complementary to turn on and off.

6. the control method of the onboard charger of electric car as any one of claim 1-3, it is characterised in that with When the second method controls the H bridges, wherein,

When supplying the power network instantaneous voltage of the onboard charger more than 0 or the external electric discharge of the onboard charger is instantaneously electric Press during more than 0, control the second switch pipe in opening state always, and control the first switch pipe to be in and close always Disconnected state, and control the 3rd switching tube and the 4th switching tube alternating, complementary to turn on and off；

When supplying the power network instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneously electric Press during less than 0, control the 4th switching tube in opening state always, and control the 3rd switching tube to be in and close always Disconnected state, and control the first switch pipe and the second switch pipe alternating, complementary to turn on and off.

7. the control method of onboard charger of electric car as claimed in claim 1, it is characterised in that with the first party Formula controls the charging setting time Tx of the H bridges to be equal to and sets time Ty with the charging of the second method control H bridges.

8. the control method of the onboard charger of electric car as any one of claim 1-6, it is characterised in that with The first method controls the electric discharge setting time Tm of the H bridges to be set equal to the electric discharge of the second method control H bridges Put time Tn.

9. a kind of onboard charger of electric car, it is characterised in that including：

H bridges, the H bridges are made up of first switch pipe, second switch pipe, the 3rd switching tube and the 4th switching tube；

Control module, the control module charges to the electrokinetic cell of the electric automobile every time in the onboard charger When control the charging setting time Tx of the H bridges in the first way and control the charging of the H bridges in a second manner for obtaining Setting time Ty, and according to Tx and Ty to the H bridges carry out alternately control with to the first switch pipe, second switch pipe, 3rd switching tube and the 4th switching tube carry out temperature equalization control, and electrokinetic cell in the electric automobile passes through institute every time State and be additionally operable to obtain electric discharge total time TC for controlling the H bridges in the first way and with when onboard charger is externally discharged Two modes control the electric discharge total time TD of the H bridges, and obtain in the discharge process of the electrokinetic cell in each discharge cycles The electric discharge of the H bridges is controlled to set with the electric discharge setting time Tm of the first method control H bridges and with the second method Put time Tn, and judge relation between electric discharge total time TC and electric discharge total time TD and according to the electric discharge Relation between total time TC and electric discharge total time TD selects the onboard charger externally to discharge when starting to the H The mode that bridge is controlled, and alternately control is carried out to the H bridges with to the first switch pipe, second according to Tm and Tn Switching tube, the 3rd switching tube and the 4th switching tube carry out temperature equalization control.

10. onboard charger of electric car as claimed in claim 9, it is characterised in that the control module according to Tx and When Ty carries out alternately control to the H bridges, wherein,

11. onboard charger of electric car as claimed in claim 9, it is characterised in that the control module according to Tm and When Tn carries out alternately control to the H bridges, wherein,

12. onboard charger of electric car as any one of claim 9-11, it is characterised in that the control mould Root tuber selects the onboard charger externally to discharge according to the relation between electric discharge total time TC and electric discharge total time TD During the mode being controlled to the H bridges during startup, wherein,

When the electric discharge total time TC electric discharge total time TD is more than, the control module is in the onboard charger pair Outer electric discharge selects the second method to be controlled the H bridges when starting, until electric discharge total time TC is equal to described putting Electric total time TD；

When the electric discharge total time TC electric discharge total time TD is less than, the control module is in the onboard charger pair Outer electric discharge selects the first method to be controlled the H bridges when starting, until electric discharge total time TC is equal to described putting Electric total time TD；

When the electric discharge total time TC electric discharge total time TD is equal to, the control module is in the onboard charger pair The first method or the second method are selected during outer electric discharge startup carries out alternately control to the H bridges with according to Tm and Tn.

13. onboard charger of electric car as any one of claim 9-11, it is characterised in that the control mould When block controls the H bridges with the first method, wherein,

When supplying the power network instantaneous voltage of the onboard charger more than 0 or the external electric discharge of the onboard charger is instantaneously electric When pressure is more than 0, the control module controls the first switch pipe to be in opening state always, and controls the second switch Pipe is in off state always, and controls the 3rd switching tube and the 4th switching tube alternating, complementary to turn on and off；

When supplying the power network instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneously electric When pressure is less than 0, the control module controls the 3rd switching tube to be in opening state always, and controls the 4th switch Pipe is in off state always, and controls the first switch pipe and the second switch pipe alternating, complementary to turn on and off.

14. onboard charger of electric car as any one of claim 9-11, it is characterised in that the control mould When block controls the H bridges with the second method, wherein,

When supplying the power network instantaneous voltage of the onboard charger more than 0 or the external electric discharge of the onboard charger is instantaneously electric When pressure is more than 0, the control module controls the second switch pipe to be in opening state always, and controls the first switch Pipe is in off state always, and controls the 3rd switching tube and the 4th switching tube alternating, complementary to turn on and off；

When supplying the power network instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneously electric When pressure is less than 0, the control module controls the 4th switching tube to be in opening state always, and controls the 3rd switch Pipe is in off state always, and controls the first switch pipe and the second switch pipe alternating, complementary to turn on and off.

15. onboard charger of electric car as claimed in claim 9, it is characterised in that institute is controlled with the first method The charging setting time Tx for stating H bridges is equal to charging setting time Ty that the H bridges are controlled with the second method.

16. onboard charger of electric car as any one of claim 9-15, it is characterised in that with described first Mode controls electric discharge setting time Tm of the H bridges to be equal to and sets the time with the electric discharge of the second method control H bridges Tn。

17. a kind of electric automobiles, it is characterised in that vehicle-mounted including the electric automobile as any one of claim 9-16 Charger.