CN106891737B

CN106891737B - The control method of electric car and its onboard charger and onboard charger

Info

Publication number: CN106891737B
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: 2019-03-29
Anticipated expiration: 2035-12-18
Also published as: CN106891737A; WO2017101832A1

Abstract

The invention discloses the control methods of a kind of electric car and its onboard charger and onboard charger, wherein, for control method the following steps are included: when power battery charging, time Ty is arranged in the charging for obtaining the charging setting time Tx for controlling H bridge in the first way and controlling H bridge in a second manner；H bridge alternately control to carry out temperature equalization control to first to fourth switching tube according to Tx and Ty；When power battery externally discharges, obtains the electric discharge total time TC for controlling H bridge in the first way and control the electric discharge total time TD of H bridge in a second manner, and obtain the setting time Tm of the electric discharge in each discharge cycles and electric discharge setting time Tn；The mode controlled when externally electric discharge starting H bridge is selected according to the relationship of TC and TD, and according to Tm and Tn to H bridge alternately control to carry out temperature equalization control to the to the 4th switching tube, so that the fever relative equilibrium of first to fourth switching tube in H bridge, improves the working life of switching tube in H bridge.

Description

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

Technical field

The present invention relates to electric vehicle engineering field, in particular to a kind of control method of onboard charger of electric car, A kind of onboard charger of electric car and a kind of electric car.

Background technique

Along with electric car be commercialized progress, onboard charger of electric car have become electric car important spare part it One.

Wherein, have much by controlling the method that onboard charger charges to vehicle and vehicle is made externally to discharge, and It mostly uses the control method of single-phase H bridge greatly in the related technology, and the control method of single-phase H bridge is used to generally comprise Bipolar control Method and unipolar control method.

But when using ambipolar control method, 4 switching tubes in H bridge are all in HF switch state, switching loss Higher, the thermal losses of generation is larger；When using unipolar control method, although can solve to use bipolarity control to a certain extent Switching tube thermal losses when method processed, but always controlled according to fixed form in H bridge during vehicle charge or discharge Four switching tubes, partial switch pipe needs belt current to turn off in H bridge, and the problems of excessive heat of the switching tube of belt current shutdown can not obtain It is solved to effective.

Therefore, regardless of using ambipolar control method or unipolar control method, opening in H bridge is not can effectively solve The heating problem for closing pipe, influences the working life of switching tube.

Summary of the invention

The present invention is directed to solve one of the technical problem in above-mentioned technology at least to a certain extent.For this purpose, of the invention First purpose be to propose a kind of control method of onboard charger of electric car, enables to first to fourth in H bridge The fever relative equilibrium of switching tube improves the working life of switching tube in H bridge.

Second object of the present invention is to propose a kind of onboard charger of electric car.Third object of the present invention exists In proposing a kind of electric car.

In order to achieve the above objectives, one aspect of the present invention embodiment proposes a kind of controlling party of onboard charger of electric car Method, the onboard charger include H bridge, and the H bridge is by first switch tube, second switch, third switching tube and the 4th switch Pipe is constituted, and the control method is the following steps are included: when the onboard charger is every time to the power battery of the electric car When being charged, obtains the charging setting time Tx for controlling the H bridge in the first way and control the H bridge in a second manner Charging setting time Ty；According to Tx and Ty to the H bridge carry out alternately control with to the first switch tube, second switch, Third switching tube and the 4th switching tube carry out temperature equalization control；When the power battery of the electric car passes through the vehicle every time When load charger is externally discharged, obtains electric discharge total time TC for controlling the H bridge in the first way and control in a second manner The electric discharge total time TD of the H bridge is made, and is obtained in the discharge process of the power battery in each discharge cycles with described the One mode controls the electric discharge setting time Tm of the H bridge and time Tn is arranged with the electric discharge that the second method controls the H bridge, And judge the relationship discharged between total time TC and the electric discharge total time TD；According to electric discharge total time TC and institute Stating the relationship between electric discharge total time TD selects the onboard charger externally discharge the side that is controlled H bridge when starting Formula, and the H bridge alternately control to the first switch tube, second switch, third switching tube according to Tm and Tn Temperature equalization control is carried out with the 4th switching tube.

The control method of onboard charger of electric car according to an embodiment of the present invention is obtained when power battery charging Time Ty is arranged in the charging setting time Tx for controlling H bridge in the first way and the charging for controlling H bridge in a second manner, and according to Tx H bridge alternately control to carry out temperature to first switch tube, second switch, third switching tube and the 4th switching tube with Ty Balance route；When power battery electric discharge, obtains and control electric discharge total time TC of H bridge in the first way and control in a second manner The electric discharge total time TD of H bridge, and obtain in the discharge process of power battery and control H bridge in the first way in each discharge cycles Time Tn is arranged in electric discharge setting time Tm and the electric discharge for controlling H bridge in a second manner, and judges the relationship between TC and TD, and The mode that H bridge is controlled when externally discharging and start according to the relationship selection onboard charger between TC and TD, and according to Tm H bridge alternately control to carry out temperature to first switch tube, second switch, third switching tube and the 4th switching tube with Tn Balance route.So that the fever relative equilibrium of each switching tube, improves the working life of switching tube in H bridge, and then extend The life cycle of onboard charger.

In order to achieve the above objectives, a kind of onboard charger of electric car that another aspect of the present invention embodiment proposes, comprising: H bridge, the H bridge are made of first switch tube, second switch, third switching tube and the 4th switching tube；Control module, the control Molding block is when the onboard charger every time charges to the power battery of the electric car for obtaining with first party Formula controls the charging setting time Tx of the H bridge and controls the charging setting time Ty of the H bridge in a second manner, and according to Tx The H bridge alternately control to the first switch tube, second switch, third switching tube and the 4th switching tube with Ty Temperature equalization control is carried out, and passes through the onboard charger every time in the power battery of the electric car and is externally put It is also used to obtain electric discharge total time TC for controlling the H bridge in the first way when electric and controls putting for the H bridge in a second manner Electric total time TD, and obtain in the discharge process of the power battery in each discharge cycles described in first method control The electric discharge setting time Tm of the H bridge and electric discharge setting time Tn that the H bridge is controlled with the second method, and put described in judgement Electric total time TC and it is described electric discharge total time TD between relationship and according to electric discharge total time TC and the electric discharge total time Relationship between TD select the onboard charger externally discharge starting when mode that the H bridge is controlled, and according to Tm The H bridge alternately control to the first switch tube, second switch, third switching tube and the 4th switching tube with Tn Carry out temperature equalization control.

Onboard charger of electric car according to an embodiment of the present invention, when power battery charging, control module obtain with First method control H bridge charging setting time Tx and in a second manner control H bridge charging be arranged time Ty, and according to Tx with Ty alternately control to H bridge equal to carry out temperature to first switch tube, second switch, third switching tube and the 4th switching tube Weighing apparatus control, and in power battery electric discharge, control module is also used to obtain the electric discharge total time TC for controlling H bridge in the first way Control the electric discharge total time TD of H bridge in a second manner, and obtain in the discharge process of power battery in each discharge cycles with First method controls the electric discharge setting time Tm of H bridge and controls the electric discharge setting time Tn of H bridge in a second manner, and judges TC Relationship between TD, and select onboard charger to control when externally discharging and starting to H bridge according to the relationship between TC and TD The mode of system, and according to Tm and Tn to H bridge carry out alternately control with to first switch tube, second switch, third switching tube and 4th switching tube carries out temperature equalization control, so that the fever relative equilibrium of each switching tube, improves the work of switching tube in H bridge Service life, to extend the life cycle of onboard charger.

In addition, the embodiment of the present invention also proposed a kind of electric car comprising the vehicle-mounted charging of above-mentioned electric car Device.

The electric car of the embodiment of the present invention, when power battery is charged and discharged by above-mentioned onboard charger When, it can be realized and temperature equalization is carried out to first switch tube, second switch, third switching tube and the 4th switching tube in H bridge Control, so that the fever relative equilibrium of each switching tube, improves the working life of switching tube in H bridge, to extend vehicle-mounted fill The life cycle of electric appliance.

Detailed description of the invention

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

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

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

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

Fig. 3 is to use first method to control to power battery charging H bridge according to one embodiment of the invention When four switching tubes control waveform diagram；

Fig. 4 is to use second method to control to power battery charging H bridge according to one embodiment of the invention When four switching tubes control waveform diagram；

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

Fig. 6 is to be controlled such that power battery is external to H bridge according to the use first method of one embodiment of the invention The control waveform diagram of four switching tubes when electric discharge；

Fig. 7 is to be controlled such that power battery is external to H bridge according to the use second method of one embodiment of the invention The control waveform diagram of four switching tubes when electric discharge；And

Fig. 8 is control when externally being discharged according to the power battery of a specific embodiment of the invention by onboard charger Flow chart.

Specific embodiment

The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.

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

As shown in figures 1A-c, onboard charger of electric car according to an embodiment of the present invention includes H bridge, and H bridge is by first Switch transistor T 1, second switch T2, third switch transistor T 3 and the 4th switch transistor T 4 are constituted.Wherein, as shown in Figure 1A, the electronic vapour Vehicle onboard charger includes the first inductance L1 and the second inductance L2, and one end or AC network AC of the first inductance L1 and load are just Extreme to be connected, the second inductance L2 is connected with the negative pole end of the other end of load or AC network AC；As shown in Figure 1B, the electronic vapour Vehicle onboard charger only includes an inductance such as the first inductance L1, one end or AC network AC of the first inductance L1 and load Positive terminal is connected；As shown in Figure 1 C, which only includes an inductance such as the first inductance L1, the first electricity Sense L1 is connected with the negative pole end of the other end of load or AC network AC.When onboard charger to the power battery of electric car into When row charging, electric energy can be provided by AC network AC；When power battery is externally discharged by onboard charger, can be Grid-connected electric discharge discharges into AC network AC, is also possible to 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 includes following step It is rapid:

S1, when onboard charger every time charges to the power battery of electric car, acquisition controls H in the first way Time Ty is arranged in the charging setting time Tx of bridge and the charging for controlling H bridge in a second manner.

According to one embodiment of present invention, as shown in figure 3, when A controls H bridge in the first way, wherein vehicle-mounted when supplying When the power grid instantaneous voltage of charger is greater than 0, control first switch tube T1 is in opening state always, and controls second switch T2 is in off state always, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, wherein When controlling third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turns on and off, the PWM wave of third switch transistor T 3 is controlled The PWM waveform of shape and the 4th switch transistor T 4 is complementary, and the duty ratio for controlling the PWM waveform of third switch transistor T 3 becomes again from becoming smaller greatly Greatly, the duty ratio for controlling the PWM waveform of the 4th switch transistor T 4 becomes smaller again from small become larger；When the power grid of supply onboard charger is instantaneous When voltage is less than 0, control third switch T3 is in opening state always, and the 4th switch transistor T 4 of control is in and turns off shape always State, and control first switch tube T1 and second switch T2 alternating, complementary turn on and off, wherein in control first switch tube When T1 and second switch T2 alternating, complementary turn on and off, the PWM waveform and second switch T2 of first switch tube T1 are controlled PWM waveform it is complementary, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes larger again from becoming smaller greatly, controls second switch The duty ratio of the PWM waveform of pipe T2 becomes smaller again from small become larger.

Also, as shown in figure 4, when B controls H bridge in a second manner, wherein when the power grid of supply onboard charger is instantaneously electric When pressure is greater than 0, control second switch T2 is in opening state always, and controls first switch tube T1 and be in and turn off shape always State, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, wherein in control third switching tube When T3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, the PWM waveform and the 4th switch transistor T 4 of third switch transistor T 3 are controlled PWM waveform it is complementary, and the duty ratio for controlling the PWM waveform of third switch transistor T 3 becomes smaller again from small become larger, the 4th switch of control The duty ratio of the PWM waveform of pipe T4 becomes larger again from becoming smaller greatly；When supplying the power grid instantaneous voltage of onboard charger less than 0, control It makes the 4th switch transistor T 4 and is in opening state always, and control third switch transistor T 3 and be in off state always, and control the One switch transistor T 1 and second switch T2 alternating, complementary turn on and off, wherein in control first switch tube T1 and second switch When pipe T2 alternating, complementary turns on and off, the PWM waveform of the PWM waveform and second switch T2 that control first switch tube T1 is mutual It mends, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes smaller again from small become larger, controls the PWM wave of second switch T2 The duty ratio of shape becomes larger again from becoming smaller greatly.

S2, according to Tx and Ty to H bridge carry out alternately control with to first switch tube, second switch, third switching tube and 4th switching tube carries out temperature equalization control.

Wherein, it should be noted that during onboard charger is to power battery charging, if only with first party Formula A controls H bridge, and when network voltage instantaneous value is greater than 0, first switch tube T1 keeps open-minded always, second switch T2 Holding turns off always, and third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, and open in third switch transistor T 3 Induction charging when logical, the 4th switch transistor T 4 turns off in onboard charger is opened in the shutdown of third switch transistor T 3, the 4th switch transistor T 4 Inductive discharge when logical；When network voltage instantaneous value is less than 0, third switch transistor T 3 keeps open-minded always, and the 4th switch transistor T 4 is kept Turn off always, first switch tube T1 and second switch T2 alternating, complementary turn on and off, and open in first switch tube T1, Induction charging when two switch transistor Ts 2 turn off in onboard charger, when first switch tube T1 shutdown, second switch T2 are opened Inductive discharge.To induction charging when being opened due to first switch tube T1 and third switch transistor T 3, it is bigger to open duty, therefore One switch transistor T 1, third switch transistor T 3 can overheat.

Similarly, during onboard charger is to power battery charging, if only with second method B to H bridge into Row control, when network voltage instantaneous value is greater than 0, first switch tube T1 holding is turned off always, and second switch T2 holding is opened always Logical, third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, and open in the 4th switch transistor T 4, third switch Induction charging when pipe T3 is turned off in onboard charger, when the shutdown of the 4th switch transistor T 4, third switch transistor T 3 are opened, inductance is put Electricity；When network voltage instantaneous value is less than 0, the 4th switch transistor T 4 keeps open-minded always, and the holding of third switch transistor T 3 turns off always, the One switch transistor T 1 and second switch T2 alternating, complementary turn on and off, and open in second switch T2, first switch tube T1 Induction charging when shutdown in onboard charger, the inductive discharge when second switch T2 shutdown, first switch tube T1 are opened.By To induction charging when second switch T2 and the 4th switch transistor T 4 are opened, it is bigger to open duty, therefore second switch T2, 4th switch transistor T 4 can overheat.

Therefore, in an embodiment of the present invention, when onboard charger every time charges to power battery, first be arranged Tx and Ty first can be controlled such that onboard charger to H bridge using first method A then during to power battery charging To power battery charging, until reaching Tx using the time that first method A controls H bridge, it is switched to using second method B To H bridge be controlled such that onboard charger to power battery charging, until using second method B to H bridge controlled when Between reach Ty, so complete a charging cycle (i.e. a charge cycle time=Tx+Ty), then be switched to using first method A to H bridge be controlled such that onboard charger to power battery charging, until using first method A to H bridge controlled when Between reach Tx, then switch to using second method B to H bridge be controlled such that onboard charger to power battery charging, directly Reach Ty to the time controlled using second method B H bridge ... ..., carry out repeatedly, realization replaces H bridge Control carries out temperature equalization control to first switch tube, second switch, third switching tube and the 4th switching tube to realize. Certainly, during to power battery charging, onboard charger first can also be controlled such that H bridge using second method B To power battery charging, until reaching Ty using the time that second method B controls H bridge, it is switched to using first method A To H bridge be controlled such that onboard charger to power battery charging, until using first method A to H bridge controlled when Between reach Tx, so complete a charging cycle, and be repeated according to such charging cycle, until power battery charging is complete At.

In other words, alternately control is carried out to H bridge according to Tx and Ty in above-mentioned steps S2, comprising: when using first method control When the time of H bridge processed reaches Tx, H bridge is controlled using second method, until being reached using the time of second method control H bridge To Ty；Or when the time using second method control H bridge reaches Ty, H bridge is controlled using first method, until adopting Reach Tx with the time of first method control H bridge.

According to one embodiment of present invention, the charging setting time Tx for controlling H bridge in the first way can be equal to second Mode controls the charging setting time Ty of H bridge.

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

S501, wave is opened in charging, i.e., when onboard charger is to power battery charging, needs to export control waveform and come to H bridge In switching tube controlled.

Tx and Ty is arranged in S502.

S503 is controlled such that onboard charger charges to power battery to H bridge using first method A, and Judge whether this charging terminates in charging process, if so, terminating process, continues to judge if not, returning.

S504 judges whether reach Tx using the time of first method A control H bridge.If so, executing step S505；Such as Fruit is no, return step S503.

S505 is controlled such that onboard charger charges to power battery to H bridge using second method B, and Judge whether this charging terminates in charging process, if so, terminating process, continues to judge if not, returning.

S506 judges whether reach Ty using the time of second method B control H bridge.If so, returning to step S503；If not, return step S505.

Therefore, the control method of the onboard charger of electric car of the embodiment of the present invention can make onboard charger right every time Guarantee that first switch tube, second switch, third switching tube and the fever of the 4th switching tube are relatively flat during power battery charging Weighing apparatus, improves the working life of onboard charger.

S3 is obtained when the power battery of electric car, which passes through onboard charger every time, externally to be discharged with first party Formula controls the electric discharge total time TC of H bridge and controls the electric discharge total time TD of H bridge in a second manner, and obtains the electric discharge of power battery It controls the electric discharge setting time Tm of H bridge in each discharge cycles in the first way in the process and controls putting for H bridge in a second manner Electricity setting time Tn, and the relationship between judgement electric discharge total time TC and the total time TD that discharges.

According to one embodiment of present invention, as shown in fig. 6, when A controls H bridge in the first way, wherein work as vehicle-mounted charge When the external electric discharge instantaneous voltage of device is greater than 0, control first switch tube T1 is in opening state always, and controls second switch T2 is in off state always, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, wherein When controlling third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turns on and off, the PWM wave of third switch transistor T 3 is controlled The PWM waveform of shape and the 4th switch transistor T 4 is complementary, and the duty ratio for controlling the PWM waveform of third switch transistor T 3 becomes again from becoming smaller greatly Greatly, the duty ratio for controlling the PWM waveform of the 4th switch transistor T 4 becomes smaller again from small become larger；When the external electric discharge of onboard charger is instantaneous When voltage is less than 0, control third switch transistor T 3 is in opening state always, and the 4th switch transistor T 4 of control is in and turns off shape always State, and control first switch tube T1 and second switch T2 alternating, complementary turn on and off, wherein in control first switch tube When T1 and second switch T2 alternating, complementary turn on and off, the PWM waveform and second switch T2 of first switch tube T1 are controlled PWM waveform it is complementary, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes larger again from becoming smaller greatly, controls second switch The duty ratio of the PWM waveform of pipe T2 becomes smaller again from small become larger.

Also, as shown in fig. 7, when B controls H bridge in a second manner, wherein when the instantaneous electricity of external electric discharge of onboard charger When pressure is greater than 0, control second switch T2 is in opening state always, and controls first switch tube T1 and be in and turn off shape always State, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, wherein in control third switching tube When T3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, the PWM waveform and the 4th switch transistor T 4 of third switch transistor T 3 are controlled PWM waveform it is complementary, and the duty ratio for controlling the PWM waveform of third switch transistor T 3 becomes smaller again from small become larger, the 4th switch of control The duty ratio of the PWM waveform of pipe T4 becomes larger again from becoming smaller greatly；When the external electric discharge instantaneous voltage of onboard charger is less than 0, control It makes the 4th switch transistor T 4 and is in opening state always, and control third switch transistor T 3 and be in off state always, and control the One switch transistor T 1 and second switch T2 alternating, complementary turn on and off, wherein in control first switch tube T1 and second switch When pipe T2 alternating, complementary turns on and off, the PWM waveform of the PWM waveform and second switch T2 that control first switch tube T1 is mutual It mends, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes smaller again from small become larger, controls the PWM wave of second switch T2 The duty ratio of shape becomes larger again from becoming smaller greatly.

S4 externally discharges starting according to the relationship selection onboard charger between electric discharge total time TC and the total time TD that discharges When mode that H bridge is controlled, and according to Tm and Tn to H bridge alternately control with to first switch tube, second switch, Third switching tube and the 4th switching tube carry out temperature equalization control.

Wherein, it should be noted that during power battery is externally discharged by onboard charger, if only with First method A controls H bridge, and when external discharge voltage instantaneous value is greater than 0, first switch tube T1 keeps open-minded always, the The holding of two switch transistor Ts 2 turns off always, and third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, and in third The shutdown of switch transistor T 3, induction charging of the 4th switch transistor T 4 when opening in onboard charger, are opened in third switch transistor T 3, the 4th Inductive discharge when switch transistor T 4 turns off；When external discharge voltage instantaneous value is less than 0, third switch transistor T 3 keeps open-minded always, the The holding of four switch transistor Ts 4 turns off always, and first switch tube T1 and second switch T2 alternating, complementary turn on and off, and first The shutdown of switch transistor T 1, induction charging of second switch T2 when opening in onboard charger, are opened in first switch tube T1, second Inductive discharge when switch transistor T 2 turns off.To induction charging when being opened due to second switch T2 and the 4th switch transistor T 4, so Two switch transistor Ts 2 and the shutdown of 4 belt current of the 4th switch transistor T, carry out hard switching, therefore second switch T2 and the 4th switch transistor T 4 It will appear superheating phenomenon.

Similarly, during power battery is externally discharged by onboard charger, if only with B pairs of second method H bridge is controlled, and when external discharge voltage instantaneous value is greater than 0, first switch tube T1 holding is turned off always, and second switch T2 is protected To hold open-minded always, third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, and turn off in the 4th switch transistor T 4, Induction charging when third switch transistor T 3 is opened in onboard charger is opened in the 4th switch transistor T 4, third switch transistor T 3 turns off When inductive discharge；When external discharge voltage instantaneous value is less than 0, the 4th switch transistor T 4 keeps open-minded always, and third switch transistor T 3 is protected Hold and turn off always, first switch tube T1 and second switch T2 alternating, complementary turn on and off, and second switch T2 turn off, Induction charging when first switch tube T1 is opened in onboard charger is opened in second switch T2, first switch tube T1 shutdown When inductive discharge.To induction charging when being opened due to first switch tube T1 and third switch transistor T 3, thus first switch tube T1 and The shutdown of 3 belt current of third switch transistor T carries out hard switching, therefore first switch tube T1 and third switch transistor T 3 will appear overheat now As.

Therefore, in an embodiment of the present invention, power battery, which passes through vehicle, to be controlled such that H bridge using first method A When load charger externally discharges, the time that record controls H bridge using first method A, thus available A in the first way The electric discharge total time TC for controlling H bridge, is then stored；Power battery, which passes through, to be controlled such that H bridge using second method B When onboard charger externally discharges, the time that record controls H bridge using second method B, thus available with second party Formula B controls the electric discharge total time TD of H bridge, is then stored.Then pass through onboard charger every time in power battery externally to put When electric, the relationship discharged between total time TC and the total time TD that discharges is judged, finally according to electric discharge total time TC and when discharging total Between relationship selection onboard charger between TD externally discharge the mode that H bridge is controlled when starting.

Specifically, according to one embodiment of present invention, according to the pass between electric discharge total time TC and the total time TD that discharges System's selection onboard charger externally discharge starting when H bridge is controlled mode when, wherein when electric discharge total time TC is greater than putting When electric total time TD, when onboard charger externally discharges starting, selection second method controls H bridge, until when discharging total Between TC be equal to electric discharge total time TD；When the total time TC that discharges is less than electric discharge total time TD, externally discharges and open in onboard charger Selection first method controls H bridge when dynamic, until electric discharge total time TC is equal to electric discharge total time TD；As electric discharge total time TC Equal to electric discharge total time TD when, onboard charger externally discharge starting when selection first method or second method with according to Tm with Tn carries out alternately control to H bridge.

Wherein, alternately control is carried out to H bridge according to Tm and Tn, comprising: when the time using first method control H bridge reaches When Tm, H bridge is controlled using second method, until reaching Tn using the time of second method control H bridge；Or works as and use When the time of second method control H bridge reaches Tn, H bridge is controlled using first method, until controlling H using first method The time of bridge reaches Tm.

That is, before power battery externally discharge and started by onboard charger, from storage region acquisition with the One mode controls the electric discharge total time TC of H bridge and controls the electric discharge total time TD of H bridge in a second manner, then Tm and Tn is arranged, so Judge electric discharge total time TC and electric discharge total time TD determine it is first to control using first method according to judging result afterwards H bridge processed still first controls H bridge using the second control mode, i.e., the electric discharge for controlling H bridge in the first way is obtained from storage region Total time TC and the electric discharge total time TD for controlling H bridge in a second manner, and between electric discharge total time TC and electric discharge total time TD The purpose that is judged of relationship be to confirm the mode to the control of H bridge first selected when onboard charger electric discharge starting.For example, such as The TC=20 minute, TD=18 minutes that fruit gets, then this electric discharge when first select second method B to H bridge controlled with So that power battery is externally discharged by onboard charger, and is switched to H bridge is controlled using first method A after the 2 minutes So that power battery is externally discharged by onboard charger, until being reached using the time that first method A controls H bridge Tm, then be switched to and power battery is externally discharged by onboard charger to be controlled such that H bridge using second method B, until Tn is reached using the time that second method B controls H bridge, so completes a discharge cycles (i.e. when a discharge cycles Between=Tm+Tn), then be switched to and power battery is externally put by onboard charger to be controlled such that H bridge using first method A Electricity, until the time controlled H bridge using first method A reaches Tm, then switch to using second method B to H bridge into Row controls so that power battery is externally discharged by onboard charger, until the time controlled using second method B H bridge Reach Tn ... ..., carry out repeatedly, realize and alternately control is carried out to H bridge, to realize to first switch tube, second switch Pipe, third switching tube and the 4th switching tube carry out temperature equalization control.And if the TC=18 minute got, TD=20 points Clock then first selects first method A to be controlled such that power battery is externally put by onboard charger to H bridge in this electric discharge Electricity, and be switched to power battery is external by onboard charger to be controlled such that H bridge using second method B after the 2 minutes Electric discharge, until the time controlled H bridge using second method B reaches Tn, then be switched to using first method A to H bridge into Row controls so that power battery is externally discharged by onboard charger, until the time controlled using first method A H bridge Reach Tm, so completes a discharge cycles (i.e. a discharge cycles time=Tm+Tn), then be switched to using second method B Power battery is externally discharged by onboard charger to be controlled such that H bridge, until controlling using second method B to H bridge The time of system reaches Tn, then switches to and is controlled such that power battery passes through onboard charger to H bridge using first method A Externally electric discharge carries out repeatedly until reaching Tm using the time that first method A controls H bridge ... ..., realizes to H Bridge carries out alternately control, carries out temperature to first switch tube, second switch, third switching tube and the 4th switching tube to realize Balance route.

Certainly, when the electric discharge total time TC got is equal to electric discharge total time TD, when onboard charger discharges and starts Power battery is externally discharged by onboard charger first directly can be controlled such that H bridge using first method A, until using The time that first method A controls H bridge reaches Tm, is switched to and is controlled such that power electric to H bridge using second method B Pond is externally discharged by onboard charger, until reaching Tn using the time that second method B controls H bridge, is so completed One discharge cycles (i.e. a discharge cycles time=Tm+Tn), then be switched to use first method A to H bridge controlled with Power battery is set externally to discharge by onboard charger, until Tm is reached using the time that first method A controls H bridge, It then switches to and power battery is externally discharged by onboard charger to be controlled such that H bridge using second method B, until adopting Reach Tn with the time that second method B controls H bridge ... ..., carry out repeatedly, realizes and alternately control is carried out to H bridge, Temperature equalization control is carried out to first switch tube, second switch, third switching tube and the 4th switching tube to realize.Alternatively, When the electric discharge total time TC got is equal to electric discharge total time TD, directly can also first be used when onboard charger discharges and starts Second method B is controlled such that power battery is externally discharged by onboard charger to H bridge, until using second method B to H The time that bridge is controlled reaches Tn, is switched to and is controlled such that power battery is filled by vehicle-mounted to H bridge using first method A Electric appliance externally discharges, until reaching Tm using the time that first method A controls H bridge, so completes a discharge cycles, And be repeated according to such discharge cycles, until power battery electric discharge terminates.

Wherein, mode is chosen in each discharge cycles later just according to fixed form i.e. first method or second method control H bridge processed discharges to power battery, record electric discharge total time when switching mode, for example, controlling H bridge using first method in the ban When, the electric discharge total time for controlling H bridge in the first way that when switching mode records is that this electric discharge obtains when starting from storage region The electric discharge total time for controlling H bridge in the first way taken controls H bridge plus what is recorded in this discharge cycles in the first way Discharge time.

In one embodiment of the invention, the electric discharge setting time Tm for controlling H bridge in the first way can be equal to second Mode control H bridge electric discharge setting time Tn, thus accurately control first switch tube, second switch, third switching tube and 4th switching tube fever relative equilibrium.

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

Wave is opened in S801, electric discharge, i.e., when power battery is externally discharged by onboard charger, needs to export control waveform Switching tube in H bridge is controlled.

S802, read in the first way A control H bridge electric discharge total time TC and in a second manner B control H bridge electric discharge it is total Time TD.

Tm and Tn is arranged in S803.

S804, judges whether TC is greater than TD.If so, executing step S805；If not, executing step S806.

S805 selects second method B to control H bridge, until TC=TD, then executes step S808.

S806, judges whether TC is less than TD.If so, executing step S807；If not, executing step S808 or S809.

S807 selects first method A to control H bridge, until TC=TD, then executes step S809.

S808 is controlled such that power battery is externally discharged by onboard charger to H bridge using first method A, and Judge whether this electric discharge terminates during discharge, if so, terminating process, continues to judge if not, returning.

S809 is controlled such that power battery is externally discharged by onboard charger to H bridge using second method B, and Judge whether this electric discharge terminates during discharge, if so, terminating process, continues to judge if not, returning.

S810 judges whether reach Tm using the time of first method A control H bridge.If so, executing step S809；Such as Fruit is no, return step S808.

S811 judges whether reach Tn using the time of second method B control H bridge.If so, returning to step S808；If not, return step S809.

Therefore, the control method of the onboard charger of electric car of the embodiment of the present invention can be such that power battery passes through every time Guarantee first switch tube, second switch, third switching tube and the fever of the 4th switching tube in the external discharge process of onboard charger Relative equilibrium improves the working life of onboard charger.

As shown in figures 1A-c, onboard charger of electric car according to an embodiment of the present invention includes H bridge and control module Such as MCU (Micro Control Unit, microcontroller).Wherein, H bridge is by first switch tube T1, second switch T2, third Switch transistor T 3 and the 4th switch transistor T 4 are constituted.Control module every time fills the power battery of electric car in onboard charger When time Tx being set and controls the charging setting of H bridge in a second manner for obtaining the charging of control H bridge in the first way when electric Between Ty, and according to Tx and Ty to H bridge carry out alternately control to first switch tube T1, second switch T2, third switch transistor T 3 Temperature equalization control is carried out with the 4th switch transistor T 4, and it is external in the power battery of electric car to pass through onboard charger every time It is also used to obtain the electric discharge total time TC for controlling H bridge in the first way when being discharged and controls the electric discharge of H bridge in a second manner Total time TD, and obtain the electric discharge setting for controlling H bridge in the discharge process of power battery in each discharge cycles in the first way Time Tn, and judgement electric discharge total time TC and electric discharge total time TD is arranged in time Tm and the electric discharge for controlling H bridge in a second manner Between relationship and externally discharge and open according to the relationship selection onboard charger between electric discharge total time TC and the total time TD that discharges The mode that H bridge is controlled when dynamic, and H bridge alternately control to open first switch tube T1, second according to Tm and Tn It closes pipe T2, third switch transistor T 3 and the 4th switch transistor T 4 and carries out temperature equalization control.

According to one embodiment of present invention, when control module alternately control to H bridge according to Tx and Ty, wherein when When reaching Tx using the time of first method control H bridge, H bridge is controlled using second method, until using second method The time of control H bridge reaches Ty；Or when the time using second method control H bridge reaches Ty, using first method to H bridge It is controlled, until reaching Tx using the time of first method control H bridge.

That is, in an embodiment of the present invention, when onboard charger every time charges to power battery, controlling mould Tx and Ty is first arranged in block, then during to power battery charging, can first use first method A to H bridge controlled with Make onboard charger to power battery charging, until reaching Tx using the time that first method A controls H bridge, is switched to Onboard charger is controlled such that power battery charging, until using second method B to H bridge to H bridge using second method B The time controlled reaches Ty, so completes a charging cycle (i.e. a charge cycle time=Tx+Ty), then be switched to Onboard charger is controlled such that power battery charging, until using first method A to H bridge to H bridge using first method A The time controlled reaches Tx, then switches to and is controlled such that onboard charger to power on H bridge using second method B Battery charging carries out repeatedly until reaching Ty using the time that second method B controls H bridge ... ..., realizes to H Bridge carries out alternately control, carries out temperature to first switch tube, second switch, third switching tube and the 4th switching tube to realize Balance route.Certainly, during to power battery charging, vehicle first can also be controlled such that H bridge using second method B Charger is carried to power battery charging, until reaching Ty using the time that second method B controls H bridge, is switched to use First method A is controlled such that onboard charger to power battery charging, until carrying out using first method A to H bridge to H bridge The time of control reaches Tx, so completes a charging cycle, and be repeated according to such charging cycle, until power electric Pond charging complete.

Wherein, the charging that the charging setting time Tx of control H bridge can be equal to control H bridge in a second manner in the first way is set Set time Ty.

According to one embodiment of present invention, when control module controls H bridge in the first way, wherein filled when supply is vehicle-mounted When the power grid instantaneous voltage of electric appliance is greater than 0, control module controls first switch tube T1 and is in opening state always, and controls second Switch transistor T 2 is in off state always, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T are opened and closed It is disconnected, wherein when controlling third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turns on and off, to control third switch transistor T 3 PWM waveform and the 4th switch transistor T 4 PWM waveform it is complementary, and control third switch transistor T 3 PWM waveform duty ratio from big Become smaller and become larger again, the duty ratio for controlling the PWM waveform of the 4th switch transistor T 4 becomes smaller again from small become larger；When supply onboard charger When power grid instantaneous voltage is less than 0, control module controls third switch transistor T 3 and is in opening state always, and controls the 4th switching tube T4 is in off state always, and control first switch tube T1 and second switch T2 alternating, complementary turn on and off, wherein When controlling first switch tube T1 and second switch T2 alternating, complementary turns on and off, the PWM wave of first switch tube T1 is controlled The PWM waveform of shape and second switch T2 are complementary, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes again from becoming smaller greatly Greatly, the duty ratio for controlling the PWM waveform of second switch T2 becomes smaller again from small become larger.

Also, when control module controls H bridge in a second manner, wherein when the power grid instantaneous voltage of supply onboard charger When greater than 0, control module controls second switch T2 and is in opening state always, and controls first switch tube T1 and be in and close always Disconnected state, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, wherein open in control third When pass pipe T3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, the PWM waveform and the 4th switch of third switch transistor T 3 are controlled The PWM waveform of pipe T4 is complementary, and the duty ratio for controlling the PWM waveform of third switch transistor T 3 becomes smaller again from small become larger, control the 4th The duty ratio of the PWM waveform of switch transistor T 4 becomes larger again from becoming smaller greatly；When the power grid instantaneous voltage of supply onboard charger is less than 0 When, control module controls the 4th switch transistor T 4 and is in opening state always, and controls third switch transistor T 3 and be in and turn off shape always State, and control first switch tube T1 and second switch T2 alternating, complementary turn on and off, wherein in control first switch tube When T1 and second switch T2 alternating, complementary turn on and off, the PWM waveform and second switch T2 of first switch tube T1 are controlled PWM waveform it is complementary, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes smaller again from small become larger, and controls second switch The duty ratio of the PWM waveform of pipe T2 becomes larger again from becoming smaller greatly.

In an embodiment of the present invention, control module is controlled such that power battery passes through to H bridge using first method A When onboard charger externally discharges, the time that record controls H bridge using first method A, thus available with first party Formula A controls the electric discharge total time TC of H bridge, is then stored；Power battery is controlled such that H bridge using second method B When externally being discharged by onboard charger, the time that record controls H bridge using second method B, thus available with the Two mode B control the electric discharge total time TD of H bridge, are then stored.Then pass through onboard charger pair every time in power battery When outer electric discharge, the relationship discharged between total time TC and the total time TD that discharges is judged, finally according to electric discharge total time TC and electric discharge Relationship selection onboard charger between total time TD externally discharge the mode that is controlled H bridge when starting.

Specifically, according to one embodiment of present invention, control module is according to electric discharge total time TC and electric discharge total time TD Between relationship selection onboard charger externally discharge starting when H bridge is controlled mode when, wherein when total time of discharging When TC is greater than electric discharge total time TD, control module selection second method when onboard charger externally discharges starting carries out H bridge Control, until electric discharge total time TC is equal to electric discharge total time TD；When the total time TC that discharges is less than electric discharge total time TD, mould is controlled Block selection first method when onboard charger externally discharges starting controls H bridge, puts until electric discharge total time TC is equal to Electric total time TD；When the total time TC that discharges is equal to electric discharge total time TD, control module is externally discharged starting in onboard charger When selection first method or second method with according to Tm and Tn to H bridge carry out alternately control.

Also, when control module alternately control to H bridge according to Tm and Tn, wherein when using first method control H bridge Time when reaching Tm, H bridge is controlled using second method, until reaching Tn using the time of second method control H bridge； Or when the time using second method control H bridge reaches Tn, H bridge is controlled using first method, until using the The time that one mode controls H bridge reaches Tm.

According to one embodiment of present invention, when control module controls H bridge in the first way, wherein work as onboard charger External electric discharge instantaneous voltage when being greater than 0, control module controls first switch tube T1 and is in opening state always, and controls second Switch transistor T 2 is in off state always, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T are opened and closed It is disconnected, wherein when controlling third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turns on and off, to control third switch transistor T 3 PWM waveform and the 4th switch transistor T 4 PWM waveform it is complementary, and control third switch transistor T 3 PWM waveform duty ratio from big Become smaller and become larger again, the duty ratio for controlling the PWM waveform of the 4th switch transistor T 4 becomes smaller again from small become larger；It is external when onboard charger When discharging instantaneous voltage less than 0, control module controls third switch transistor T 3 and is in opening state always, and controls the 4th switching tube T4 is in off state always, and control first switch tube T1 and second switch T2 alternating, complementary turn on and off, wherein When controlling first switch tube T1 and second switch T2 alternating, complementary turns on and off, the PWM wave of first switch tube T1 is controlled The PWM waveform of shape and second switch T2 are complementary, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes again from becoming smaller greatly Greatly, the duty ratio for controlling the PWM waveform of second switch T2 becomes smaller again from small become larger.

Also, when control module controls H bridge in a second manner, wherein when the external electric discharge instantaneous voltage of onboard charger When greater than 0, control module controls second switch T2 and is in opening state always, and controls first switch tube T1 and be in and close always Disconnected state, and control third switch transistor T 3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, wherein open in control third When pass pipe T3 and 4 alternating, complementary of the 4th switch transistor T turn on and off, the PWM waveform and the 4th switch of third switch transistor T 3 are controlled The PWM waveform of pipe T4 is complementary, and the duty ratio for controlling the PWM waveform of third switch transistor T 3 becomes smaller again from small become larger, control the 4th The duty ratio of the PWM waveform of switch transistor T 4 becomes larger again from becoming smaller greatly；When the external electric discharge instantaneous voltage of onboard charger is less than 0 When, control module controls the 4th switch transistor T 4 and is in opening state always, and controls third switch transistor T 3 and be in and turn off shape always State, and control first switch tube T1 and second switch T2 alternating, complementary turn on and off, wherein in control first switch tube When T1 and second switch T2 alternating, complementary turn on and off, the PWM waveform and second switch T2 of first switch tube T1 are controlled PWM waveform it is complementary, and the duty ratio for controlling the PWM waveform of first switch tube T1 becomes smaller again from small become larger, and controls second switch The duty ratio of the PWM waveform of pipe T2 becomes larger again from becoming smaller greatly.

In an embodiment of the present invention, as shown in Figure 1A or Figure 1B or Fig. 1 C, first switch tube T1, second switch T2, Third switch transistor T 3 and the 4th switch transistor T 4 are that (Insulated Gate Bipolar Transistor, insulated gate are double by IGBT Bipolar transistor), certainly, in other embodiments of the invention, first switch tube T1, second switch T2, third switching tube T3 and the 4th switch transistor T 4 or metal-oxide-semiconductor.

According to one embodiment of present invention, the electric discharge setting time Tm for controlling H bridge in the first way can be equal to second Mode control H bridge electric discharge setting time Tn, thus accurately control first switch tube, second switch, third switching tube and 4th switching tube fever relative equilibrium.

In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.

In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three It is a etc., unless otherwise specifically defined.

In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary The interaction relationship of the connection in portion or two elements, unless otherwise restricted clearly.For those of ordinary skill in the art For, the specific meanings of the above terms in the present invention can be understood according to specific conditions.

In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below " One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height 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. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples It closes and combines.

Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned Embodiment is changed, modifies, replacement and variant.

Claims

1. a kind of control method of onboard charger of electric car, which is characterized in that the onboard charger includes H bridge, the H Bridge is made of first switch tube, second switch, third switching tube and the 4th switching tube, and the control method includes following step It is rapid:

When the onboard charger every time charges to the power battery of the electric car, acquisition controls in the first way The charging setting time Tx of the H bridge and charging setting time Ty for controlling the H bridge in a second manner；

According to Tx and Ty to the H bridge carry out alternately control with to the first switch tube, second switch, third switching tube and 4th switching tube carries out temperature equalization control；

When the power battery of the electric car passes through the onboard charger every time externally to be discharged, obtain with first party Formula controls electric discharge total time TC of the H bridge and controls the electric discharge total time TD of the H bridge in a second manner, and obtains described dynamic In the discharge process of power battery in each discharge cycles with the first method control the H bridge electric discharge setting time Tm and with The second method controls the electric discharge setting time Tn of the H bridge, and judges that electric discharge total time TC and the electric discharge are total Relationship between time TD；

The onboard charger is selected externally to put according to the relationship between the electric discharge total time TC and the electric discharge total time TD The mode that the H bridge is controlled when electrically activating, and the H bridge alternately control to described first according to Tm and Tn Switching tube, second switch, third switching tube and the 4th switching tube carry out temperature equalization control.

2. the control method of onboard charger of electric car as described in claim 1, which is characterized in that described according to Tx and Ty Alternately control is carried out to the H bridge, comprising:

When the time for controlling the H bridge using the first method reaching Tx, the H bridge is carried out using the second method Control, until reaching Ty using the time that the second method controls the H bridge；Or

When the time for controlling the H bridge using the second method reaching Ty, the H bridge is carried out using the first method Control, until reaching Tx using the time that the first method controls the H bridge.

3. the control method of onboard charger of electric car as described in claim 1, which is characterized in that described according to Tm and Tn Alternately control is carried out to the H bridge, comprising:

When the time for controlling the H bridge using the first method reaching Tm, the H bridge is carried out using the second method Control, until reaching Tn using the time that the second method controls the H bridge；Or

When the time for controlling the H bridge using the second method reaching Tn, the H bridge is carried out using the first method Control, until reaching Tm using the time that the first method controls the H bridge.

4. the control method of onboard charger of electric car as claimed in any one of claims 1-3, which is characterized in that according to When relationship between the electric discharge total time TC and the electric discharge total time TD selects the onboard charger externally discharge to start When the mode controlled to the H bridge, wherein

When electric discharge total time TC being greater than the electric discharge total time TD, selected when the onboard charger externally discharges starting It selects the second method to control the H bridge, until electric discharge total time TC is equal to electric discharge total time TD；

When electric discharge total time TC being less than the electric discharge total time TD, selected when the onboard charger externally discharges starting It selects the first method to control the H bridge, until electric discharge total time TC is equal to electric discharge total time TD；

When electric discharge total time TC being equal to the electric discharge total time TD, selected when the onboard charger externally discharges starting The first method or the second method are selected to carry out alternately control to the H bridge according to Tm and Tn.

5. the control method of onboard charger of electric car as claimed in any one of claims 1-3, which is characterized in that with institute When stating the first method control H bridge, wherein

When the power grid instantaneous voltage for supplying the onboard charger is greater than the instantaneous electricity of external electric discharge of 0 or the onboard charger It when pressure is greater than 0, controls the first switch tube and is in opening state always, and control the second switch and be in and turn off always State, and the control third switching tube and the 4th switching tube alternating, complementary turn on and off；

When supplying the power grid instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneous electric It when pressure is less than 0, controls the third switching tube and is in opening state always, and control the 4th switching tube and be in and turn off always State, and the control first switch tube and the second switch alternating, complementary turn on and off.

6. the control method of onboard charger of electric car as claimed in any one of claims 1-3, which is characterized in that with institute When stating the second method control H bridge, wherein

When the power grid instantaneous voltage for supplying the onboard charger is greater than the instantaneous electricity of external electric discharge of 0 or the onboard charger It when pressure is greater than 0, controls the second switch and is in opening state always, and control the first switch tube and be in and turn off always State, and the control third switching tube and the 4th switching tube alternating, complementary turn on and off；

When supplying the power grid instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneous electric It when pressure is less than 0, controls the 4th switching tube and is in opening state always, and control the third switching tube and be in and turn off always State, and the control first switch tube and the second switch alternating, complementary turn on and off.

7. the control method of onboard charger of electric car as described in claim 1, which is characterized in that with the first method The charging setting time Tx for controlling the H bridge, which is equal to, is arranged time Ty with the charging that the second method controls the H bridge.

8. the control method of onboard charger of electric car as claimed in any one of claims 1-3, which is characterized in that with institute It states first method and controls the electric discharge setting time Tm of the H bridge equal to the electric discharge setting for controlling the H bridge with the second method Time Tn.

9. a kind of onboard charger of electric car characterized by comprising

H bridge, the H bridge are made of first switch tube, second switch, third switching tube and the 4th switching tube；

Control module, the control module every time charge to the power battery of the electric car in the onboard charger When control the charging setting time Tx of the H bridge in the first way for obtaining and in a second manner control the charging of the H bridge Time Ty is set, and the H bridge alternately control to the first switch tube, second switch, the according to Tx and Ty Three switching tubes and the 4th switching tube carry out temperature equalization control, and pass through every time in the power battery of the electric car described It is also used to obtain when onboard charger is externally discharged and controls electric discharge total time TC of the H bridge and in the first way with second Mode controls the electric discharge total time TD of the H bridge, and obtain in the discharge process of the power battery in each discharge cycles with The first method is controlled the electric discharge setting time Tm of the H bridge and is controlled the electric discharge setting of the H bridge with the second method Time Tn, and judge it is described electric discharge total time TC and it is described electric discharge total time TD between relationship and according to it is described electric discharge it is total when Between relationship between TC and the electric discharge total time TD select the onboard charger externally discharge starting when to H bridge progress The mode of control, and the H bridge alternately control to the first switch tube, second switch, the according to Tm and Tn Three switching tubes and the 4th switching tube carry out temperature equalization control.

10. onboard charger of electric car as claimed in claim 9, which is characterized in that the control module is according to Tx and Ty When alternately control to the H bridge, wherein

11. onboard charger of electric car as claimed in claim 9, which is characterized in that the control module is according to Tm and Tn When alternately control to the H bridge, wherein

12. the onboard charger of electric car as described in any one of claim 9-11, which is characterized in that the control module It selects the onboard charger externally to discharge according to the relationship between the electric discharge total time TC and the electric discharge total time TD to open When the mode controlled when dynamic to the H bridge, wherein

When electric discharge total time TC being greater than the electric discharge total time TD, the control module is external in the onboard charger The second method is selected to control the H bridge when electric discharge starting, until electric discharge total time TC is equal to the electric discharge Total time TD；

When electric discharge total time TC being less than the electric discharge total time TD, the control module is external in the onboard charger The first method is selected to control the H bridge when electric discharge starting, until electric discharge total time TC is equal to the electric discharge Total time TD；

When electric discharge total time TC being equal to the electric discharge total time TD, the control module is external in the onboard charger Select the first method or the second method to carry out alternately control to the H bridge according to Tm and Tn when electric discharge starting.

13. the onboard charger of electric car as described in any one of claim 9-11, which is characterized in that the control module When controlling the H bridge with the first method, wherein

When the power grid instantaneous voltage for supplying the onboard charger is greater than the instantaneous electricity of external electric discharge of 0 or the onboard charger When pressure is greater than 0, the control module controls the first switch tube and is in opening state always, and controls the second switch It is turned on and off in off state always, and the control third switching tube and the 4th switching tube alternating, complementary；

When supplying the power grid instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneous electric When pressure is less than 0, the control module controls the third switching tube and is in opening state always, and controls the 4th switching tube It is turned on and off in off state always, and the control first switch tube and the second switch alternating, complementary.

14. the onboard charger of electric car as described in any one of claim 9-11, which is characterized in that the control module When controlling the H bridge with the second method, wherein

When the power grid instantaneous voltage for supplying the onboard charger is greater than the instantaneous electricity of external electric discharge of 0 or the onboard charger When pressure is greater than 0, the control module controls the second switch and is in opening state always, and controls the first switch tube It is turned on and off in off state always, and the control third switching tube and the 4th switching tube alternating, complementary；

When supplying the power grid instantaneous voltage of the onboard charger less than 0 or the external electric discharge of the onboard charger is instantaneous electric When pressure is less than 0, the control module controls the 4th switching tube and is in opening state always, and controls the third switching tube It is turned on and off in off state always, and the control first switch tube and the second switch alternating, complementary.

15. onboard charger of electric car as claimed in claim 9, which is characterized in that control the H with the first method The charging setting time Tx of bridge, which is equal to, is arranged time Ty with the charging that the second method controls the H bridge.

16. the onboard charger of electric car as described in any one of claim 9-11 and 15, which is characterized in that with described The electric discharge setting time Tm that one mode controls the H bridge, which is equal to, is arranged the time with the electric discharge that the second method controls the H bridge Tn。

17. a kind of electric car, which is characterized in that fill including the electric car as described in any one of claim 9-16 is vehicle-mounted Electric appliance.