CN106891742B

CN106891742B - The control method of electric car and its onboard charger and onboard charger

Info

Publication number: CN106891742B
Application number: CN201510956598.6A
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: 2019-11-05
Anticipated expiration: 2035-12-18
Also published as: WO2017101833A1; CN106891742A

Abstract

The invention discloses the control methods of a kind of electric car and its onboard charger and onboard charger, wherein, control method obtains the charging total time TA for controlling H bridge in the first way and controls the charging total time TB of H bridge in a second manner the following steps are included: when power battery charging；According to the mode that the selection of the relationship of TA and TB controls H bridge to carry out temperature equalization control to first to fourth switching tube；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 power battery of the onboard charger to the electric car carries out When charging, the charging for obtaining charging total time TA for controlling the H bridge in the first way and controlling the H bridge in a second manner is total Time TB, and judge the relationship between the charging total time TA and the charging total time TB；According to the charging total time Relationship between TA and the charging total time TB selects the mode that is controlled the H bridge, 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 is every It is secondary when externally being discharged by the onboard charger, obtain electric discharge total time TC for controlling the H bridge in the first way and The electric discharge total time TD of the H bridge is controlled in a second manner, and is obtained each electric discharge in the discharge process of the power battery and followed The electric discharge setting time Tm of the H bridge is controlled with the first method in ring and putting for the H bridge is controlled with the second method Electricity setting time Tn, and judge the relationship between the electric discharge total time TC and the electric discharge total time TD；It is put according to described Relationship between electric total time TC and the electric discharge total time TD selects the onboard charger externally to discharge when starting to the H The mode that bridge is controlled, and the H bridge alternately control to the first switch tube, second switch according to Tm and Tn Pipe, third switching tube and the 4th switching tube carry out temperature equalization control.

The control method of onboard charger of electric car according to an embodiment of the present invention is obtained in power battery charging The charging total time TA of H bridge is controlled in the first way and controls the charging total time TB of H bridge in a second manner, and judges TA and TB Between relationship, and the mode that is controlled H bridge is selected according to the relationship between TA and TB, to first switch tube, the Two switching tubes, third switching tube and the 4th switching tube carry out temperature equalization control；When power battery electric discharge, obtain 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 judge the relationship between TC and TD, and onboard charger pair is selected according to the relationship between TC and TD The mode that H bridge is controlled when outer electric discharge starting, and H bridge alternately control to first switch according to Tm and Tn Pipe, second switch, third switching tube and the 4th switching tube carry out temperature equalization control.So that the fever of each switching tube Relative equilibrium improves the working life of switching tube in H bridge, and then extends 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 controlled when power battery of the onboard charger to the electric car charges for obtaining in the first way It makes charging total time TA of the H bridge and controls the charging total time TB of the H bridge in a second manner, and judge that the charging is total Relationship between time TA and the charging total time TB, and according to charging total time TA and charging total time TB Between relationship select the mode that is controlled the H bridge, to be switched to the first switch tube, second switch, third Pipe and the 4th switching tube carry out temperature equalization control, and pass through described vehicle-mounted fill every time in the power battery of the electric car It is also used to obtain electric discharge total time TC for controlling the H bridge in the first way when electric appliance is externally discharged and controls 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 relationship between the electric discharge total time TC and the electric discharge total time TD and according to electric discharge total time TC and Relationship between the electric discharge total time TD selects the onboard charger externally discharge to control the H bridge when starting Mode, and the H bridge alternately control to switch the first switch tube, second switch, third according to Tm and Tn Pipe and the 4th switching tube carry out temperature equalization control.

Onboard charger of electric car according to an embodiment of the present invention, in power battery charging, control module obtain with First method controls the charging total time TA of H bridge and controls the charging total time TB of H bridge in a second manner, and judge TA and TB it Between relationship, and the mode that is controlled H bridge is selected according to the relationship between TA and TB, to first switch tube, second Switching tube, third switching tube and the 4th switching tube carry out temperature equalization control, and in power battery electric discharge, control module is also For obtaining the electric discharge total time TC of control H bridge in the first way and in a second manner the electric discharge total time TD of control H bridge, and obtain Take the electric discharge setting time Tm for controlling H bridge in the discharge process of power battery in each discharge cycles in the first way and with second Mode controls the electric discharge setting time Tn of H bridge, and judges the relationship between TC and TD, and select according to the relationship between TC and TD Select onboard charger externally discharge starting when mode that H bridge is controlled, and alternately control is carried out to H bridge according to Tm and Tn To carry out temperature equalization control to first switch tube, second switch, third switching tube and the 4th switching tube, so that each switch The fever relative equilibrium of pipe improves the working life of switching tube in H bridge, 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 is obtained when power battery of the onboard charger to electric car charges and is controlled H bridge in the first way The charging total time TA and charging total time TB for controlling H bridge in a second manner, and judge charge total time TA and charging total time Relationship between TB.

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 less 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 power grid instantaneous voltage for supplying onboard charger is greater 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 selects the mode controlled H bridge according to the relationship between charging total time TA and the total time TB that charges, with Temperature equalization control is carried out to first switch tube, second switch, third switching tube and the 4th switching tube.

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 less 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 greater 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, it is controlled such that onboard charger to dynamic on H bridge using first method A When power battery charges, the time that record controls H bridge using first method A, so that available control H bridge in the first way Charging total time TA, then stored；It is controlled such that onboard charger to power electric on H bridge using second method B When pond is charged, the time that record controls H bridge using second method B, so that available control filling for H bridge in a second manner Electric total time TB, is then stored.Then the relationship between judgement charging total time TA and the total time TB that charges, last basis Relationship between charging total time TA and the total time TB that charges selects the mode controlled H bridge, opens to realize first Guan Guan, second switch, third switching tube and the 4th switching tube carry out temperature equalization control.

Wherein, the mode controlled H bridge is selected according to the relationship between charging total time TA and the total time TB that charges, It specifically includes: when the total time TA that charges is greater than charging total time TB, second method being selected to control H bridge；When charging is total When time TA is less than charging total time TB, first method is selected to control H bridge；When the total time TA that charges, which is equal to, charges total Between TB when, select first method or second method to control 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.

S502, read in the first way A control H bridge charging total time TA and in a second manner B control H bridge charging it is total Time TB.

S503, judges whether TA is greater than TB.If so, executing step S504；If not, executing step S508.

S504 selects second method B to control H bridge.

S505, onboard charger carry out charging process to power battery.

S506, judges whether this charging process terminates.If so, executing step S507；If not, return step S505。

S507 records this charging time, thus when total from the charging that storage region obtains when being started according to this charging Between TB plus this charging time come update charging total time TB.

S508, judges whether TA is less than TB.If so, executing step S509；If not, executing step S513.

S509 selects first method A to control H bridge.

S510, onboard charger carry out charging process to power battery.

S511, judges whether this charging process terminates.If so, executing step S512；If not, return step S510。

S512 records this charging time, thus when total from the charging that storage region obtains when being started according to this charging Between TA plus this charging time come update charging total time TA.

S513 selects first method A or second method B to control H bridge.

S514, onboard charger carry out charging process to power battery.

S515, judges whether this charging process terminates.If so, executing step S516；If not, return step S514。

S516 records this charging time.Wherein, H bridge is controlled if it is selection first method A, thus according to this The charging total time TA obtained when charging starts from storage region updates charging total time TA plus this charging time；If It is that selection second method B controls H bridge, to add when being started according to this charging from the charging total time TB that storage region obtains This upper charging time updates charging total time TB.

It is to be controlled using first method or second method H bridge, and record use when therefore, by recording charging every time Charging total time TA when first method and charging total time TB when using second method, then to the relationship between TA and TB Judged, to select the mode of control H bridge, opening in H bridge can be realized in the whole life cycle of onboard charger The calorific value and overcurrent relative equilibrium for closing pipe T1, T2, T3 and T4, can just increase the working life of onboard charger in this way, Reduce failure rate.

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 less 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 greater 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 less 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 greater 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.

The control method of onboard charger of electric car according to an embodiment of the present invention is obtained when power battery charging The charging total time TA of H bridge is controlled in the first way and controls the charging total time TB of H bridge in a second manner, and judges TA and TB Between relationship, and the mode that is controlled H bridge is selected according to the relationship between TA and TB, to first switch tube, the Two switching tubes, third switching tube and the 4th switching tube carry out temperature equalization control；When power battery electric discharge, obtain 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 judge the relationship between TC and TD, and onboard charger pair is selected according to the relationship between TC and TD Mode that H bridge is controlled when outer electric discharge starting, 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.So that the fever phase of each switching tube To balance, the working life of switching tube in H bridge is improved, and then extends the life cycle 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 is when power battery of the onboard charger to electric car charges For obtaining the charging total time TA of control H bridge in the first way and in a second manner the charging total time TB of control H bridge, and sentence Relationship between disconnected charging total time TA and the total time TB that charges, and according between charging total time TA and charging total time TB Relationship select the mode that is controlled H bridge, to first switch tube T1, second switch T2, third switch transistor T 3 and the Four switch transistor Ts 4 carry out temperature equalization control, and pass through onboard charger every time in the power battery of electric car and externally carry out Be also used to when electric discharge obtain in the first way control H bridge electric discharge total time TC and in a second manner control H bridge electric discharge it is total when Between TD, and obtain the electric discharge setting time for controlling H bridge in the discharge process of power battery in each discharge cycles in the first way Tm and the electric discharge for controlling H bridge in a second manner are arranged between time Tn, and judgement electric discharge total time TC and electric discharge total time TD Relationship and according to electric discharge total time TC and discharge total time TD between relationship selection onboard charger externally discharge start when H bridge alternately control to first switch tube T1, second switch to the mode that H bridge is controlled, and according to Tm and Tn T2, third switch transistor T 3 and the 4th switch transistor T 4 carry out temperature equalization control.

According to one embodiment of present invention, control module is according to the pass between charging total time TA and the total time TB that charges When the mode that system's selection controls H bridge, wherein when the total time TA that charges is greater than charging total time TB, control module choosing Second method is selected to control H bridge；When the total time TA that charges is less than charging total time TB, control module selects first method H bridge is controlled；When the total time TA that charges is equal to charging total time TB, control module selects first method or second method H bridge is controlled.

That is, in an embodiment of the present invention, control module is controlled such that vehicle to H bridge using first method A When carrying charger to power battery charging, the time that record controls H bridge using first method A, thus available with the One mode controls the charging total time TA of H bridge, is then stored；Control module use second method B to H bridge controlled with When making onboard charger to power battery charging, the time that record controls H bridge using second method B, thus available The charging total time TB for controlling H bridge in a second manner, is then stored.Then control module judges charging total time TA and fills Relationship between electric total time TB, finally according to charging total time TA and charge total time TB between relationship selection to H bridge into The mode of row control, to realize equal to first switch tube, second switch, third switching tube and the 4th switching tube progress temperature Weighing apparatus control.

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 less 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 greater 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 less 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 greater 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.

Onboard charger of electric car according to an embodiment of the present invention, when power battery charging, control module obtain with First method controls the charging total time TA of H bridge and controls the charging total time TB of H bridge in a second manner, and judge TA and TB it Between relationship, and the mode that is controlled H bridge is selected according to the relationship between TA and TB, to first switch tube, second Switching tube, third switching tube and the 4th switching tube carry out temperature equalization control, and in power battery electric discharge, control module is also For obtaining the electric discharge total time TC of control H bridge in the first way and in a second manner the electric discharge total time TD of control H bridge, and obtain Take the electric discharge setting time Tm for controlling H bridge in the discharge process of power battery in each discharge cycles in the first way and with second Mode controls the electric discharge setting time Tn of H bridge, and judges the relationship between TC and TD, and select according to the relationship between TC and TD Select onboard charger externally discharge starting when mode that H bridge is controlled, and alternately control is carried out to H bridge according to Tm and Tn To carry out temperature equalization control to first switch tube, second switch, third switching tube and the 4th switching tube, so that each switch The fever relative equilibrium of pipe improves the working life of switching tube in H bridge, to extend the life cycle of onboard charger.

The electric car of the embodiment of the present invention is charged and discharged in power battery 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.

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 power battery of the onboard charger to the electric car charges, obtain described in control in the first way Charging total time TA of H bridge and the charging total time TB for controlling the H bridge in a second manner, and judge charging total time TA With the relationship between the charging total time TB；

The side controlled the H bridge is selected according to the relationship between the charging total time TA and the charging total time TB Formula, to carry out temperature equalization control to the first switch tube, second switch, third switching tube and the 4th switching tube；

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；

The first method includes: the first control mode when the power grid instantaneous voltage for supplying the onboard charger is greater than 0 With when supplying second control mode of the power grid instantaneous voltage of the onboard charger less than 0 when, first control mode and Second control mode is different；The second method includes: when the power grid instantaneous voltage for supplying the onboard charger is greater than 0 When third control mode and when supplying fourth control mode of the power grid instantaneous voltage of the onboard charger less than 0 when, institute It is different with the 4th control mode to state third control mode.

2. the control method of onboard charger of electric car as described in claim 1, which is characterized in that total according to the charging Relationship between time TA and the charging total time TB selects the mode controlled the H bridge, specifically includes:

When charging total time TA being greater than the charging total time TB, the second method is selected to control the H bridge System；

When charging total time TA being less than the charging total time TB, the first method is selected to control the H bridge System；

When charging total time TA being equal to the charging total time TB, the first method or the second method pair are selected The H bridge is controlled.

3. the control method of onboard charger of electric car as described in claim 1, which is characterized in that total according to the electric discharge Relationship between time TC and the electric discharge total time TD select the onboard charger externally discharge when starting to the H bridge into When the mode of row control, 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.

4. 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.

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 second method control H bridge, wherein

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 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 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 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.

6. the control method of onboard charger of electric car as claimed in any one of claims 1-3, which is characterized in that described Alternately control is carried out to the H bridge according to Tm and Tn, 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.

7. the control method of onboard charger of electric car as claimed in claim 6, which is characterized in that with the first method The electric discharge setting time Tm for controlling the H bridge, which is equal to, is arranged time Tn with the electric discharge that the second method controls the H bridge.

8. 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 are used when power battery of the onboard charger to the electric car charges In obtaining charging total time TA for controlling the H bridge in the first way and control charging total time of the H bridge in a second manner TB, and judge the relationship between the charging total time TA and the charging total time TB, and according to the charging total time Relationship between TA and the charging total time TB selects the mode that is controlled the H bridge, with to the first switch tube, Second switch, third switching tube and the 4th switching tube carry out temperature equalization control, and in the power electric of the electric car Pond be also used to when externally being discharged by the onboard charger every time obtain control in the first way the H bridge electric discharge it is total The time TC and electric discharge total time TD for controlling the H bridge in a second manner, and obtain every in the discharge process of the power battery Time Tm is arranged and described in second method control in the interior electric discharge for controlling the H bridge with the first method of a discharge cycles Time Tn is arranged in the electric discharge of H bridge, and judges the relationship and root between the electric discharge total time TC and the electric discharge total time TD The onboard charger is selected externally to discharge starting according to the relationship between the electric discharge total time TC and the electric discharge total time TD When mode that the H bridge is controlled, and the H bridge alternately control to the first switch according to Tm and Tn Pipe, second switch, third switching tube and the 4th switching tube carry out temperature equalization control；

Wherein, the first method includes: the first control when the power grid instantaneous voltage for supplying the onboard charger is greater than 0 Mode and the second control mode when the power grid instantaneous voltage of the supply onboard charger is less than 0, first controlling party Formula is different with second control mode；The second method includes: when the power grid instantaneous voltage for supplying the onboard charger Third control mode when greater than 0 and the 4th controlling party when the power grid instantaneous voltage of the supply onboard charger is less than 0 Formula, the third control mode are different with the 4th control mode.

9. onboard charger of electric car as claimed in claim 8, which is characterized in that the control module is according to the charging When the mode that the relationship selection between total time TA and the charging total time TB controls the H bridge, wherein

When charging total time TA being greater than the charging total time TB, the control module selects the second method to institute H bridge is stated to be controlled；

When charging total time TA being less than the charging total time TB, the control module selects the first method to institute H bridge is stated to be controlled；

When charging total time TA being equal to the charging total time TB, the control module selects the first method or institute Second method is stated to control the H bridge.

10. onboard charger of electric car as claimed in claim 8, which is characterized in that the control module is put according to Relationship between electric total time TC and the electric discharge total time TD selects the onboard charger externally to discharge when starting to the H When the mode that bridge is controlled, 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.

11. the onboard charger of electric car as described in any one of claim 8-10, 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.

12. the onboard charger of electric car as described in any one of claim 8-10, which is characterized in that the control module When controlling the H bridge with the second method, wherein

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 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 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 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.

13. the onboard charger of electric car as described in any one of claim 8-10, which is characterized in that the control module When alternately control to the H bridge according to Tm and Tn, wherein

14. onboard charger of electric car as claimed in claim 13, which is characterized in that described in first method control The electric discharge setting time Tm of H bridge, which is equal to, is arranged time Tn with the electric discharge that the second method controls the H bridge.

15. a kind of electric car, which is characterized in that fill including the electric car as described in any one of claim 8-14 is vehicle-mounted Electric appliance.