阅读说明：本技术 一种电动汽车的车载双向充电机电路 (A kind of vehicle-mounted bidirectional charger circuit of electric car ) 是由 肖泽福 范自立 阮世良 于 2019-08-30 设计创作，主要内容包括：本发明公开了一种电动汽车的车载双向充电机电路,包括整流模块、DC/DC转换模块和控制电路,整流模块通过直流母线接DC/DC转换模块,车载双向充电机电路的工作模式包括正向电池充电模式和反向交流电输出模式；在正向电池充电模式下,整流模块作为全桥PWM整流电路进行工作,DC/DC转换模块作为全桥LLC整流电路进行工作；在反向交流电输出模式下,DC/DC转换模块作为全桥LC整流电路进行工作,整流模块作为全桥逆变电路进行工作。本发明的车载双向充电机成本低、功率密度高、能用较小的体积实现大功率输出。(The invention discloses a kind of vehicle-mounted bidirectional charger circuits of electric car, including rectification module, DC/DC conversion module and control circuit, rectification module connects DC/DC conversion module by DC bus, and the operating mode of vehicle-mounted bidirectional charger circuit includes positive battery charging mode according to user and Opposed crossing electricity output mode；Under positive battery charging mode according to user, rectification module works as full bridge PWM rectification circuit, and DC/DC conversion module works as full-bridge LLC rectification circuit；Under Opposed crossing electricity output mode, DC/DC conversion module works as full-bridge LC rectification circuit, and rectification module works as full bridge inverter.Vehicle-mounted bidirectional charger of the invention is at low cost, power density is high, can realize high-power output with lesser volume.)

1. a kind of vehicle-mounted bidirectional charger circuit of electric car, including rectification module, DC/DC conversion module and control circuit, Rectification module connects DC/DC conversion module by DC bus, and the operating mode of vehicle-mounted bidirectional charger circuit includes positive battery Charge mode and Opposed crossing electricity output mode, which is characterized in that under positive battery charging mode according to user, rectification module is as full-bridge PWM rectification circuit works, and DC/DC conversion module works as full-bridge LLC rectification circuit；In Opposed crossing electricity output Under mode, DC/DC conversion module works as full-bridge LC rectification circuit, and rectification module carries out work as full bridge inverter Make.

2. vehicle-mounted bidirectional charger circuit according to claim 1, which is characterized in that rectification module includes ac filter electricity Two switching tubes of 4 switching tubes that appearance, the first inductance, the first bus capacitor are connected with bridge-type, the first half-bridge use metal-oxide-semiconductor, Two switching tubes of the second half-bridge are managed using IGBT；When rectification module is worked as full bridge PWM rectification circuit, the first electricity Sense is used as boost inductance；When rectification module is worked as full bridge inverter, the first inductance is as ac filter inductance.

3. vehicle-mounted bidirectional charger circuit according to claim 2, which is characterized in that when rectification module is as full bridge PWM When rectification circuit is worked, the control signal of the second switching tube of half-bridge two is that lagging leg sends out wave waveform, and switching frequency exists 40HZ~60HZ, waveform is complementary, and switching frequency follows input AC electric；The control signal of first switching tube of half-bridge two is advanced Arm sends out wave waveform, and switching frequency is that fixed HF switch frequency obtains by adjusting the duty ratio of first two switching tubes of half-bridge Obtain stable DC bus-bar voltage.

4. vehicle-mounted bidirectional charger circuit according to claim 3, which is characterized in that DC bus-bar voltage setting value subtracts Instantaneous d-c bus voltage value, the difference of generation enter Voltage loop PI adjusting, and the numerical value that Voltage loop PI is adjusted multiplies in input Instantaneous voltage obtains data, then subtracts input current instantaneous value and obtain difference and enter electric current loop PI adjusting, obtains PWM value and goes the The duty ratio of one two switching tubes of half-bridge.

5. vehicle-mounted bidirectional charger circuit according to claim 2, which is characterized in that when rectification module is as full-bridge inverting When circuit is worked, the control signal of the second switching tube of half-bridge two is that lagging leg sends out wave waveform, and fixed hair wave frequency rate is set to 50HZ, waveform are complementary；The control signal of first switching tube of half-bridge two is that leading arm sends out wave waveform, and switching frequency is fixed height The duty ratio of frequency switching frequency, first two switching tubes of half-bridge progressively increases to maximum value from zero, then gradually decreases from maximum value To zero, to obtain the sine wave of 50HZ.

6. vehicle-mounted bidirectional charger circuit according to claim 5, which is characterized in that the voltage value for exporting setting subtracts wink When output voltage values generate difference enter Voltage loop PI adjusting, obtain accounting for for two switching tubes of the first half-bridge of PWM value de-regulation Sky than duty ratio,.

7. vehicle-mounted bidirectional charger circuit according to claim 1, which is characterized in that DC/DC conversion module includes transformation Device, primary circuit and secondary circuit, primary circuit include 4 that the second bus capacitor, resonant capacitance, resonant inductance are connected with bridge-type A primary side switch pipe, secondary circuit include 4 secondary-side switch pipes that DC filter capacitor is connected with bridge-type；Primary side bridge circuit two The midpoint of a half-bridge connects the series circuit of resonant capacitance, resonant inductance and transformer primary winding, secondary side bridge circuit two and half The midpoint of bridge connects the vice-side winding of transformer.

8. vehicle-mounted bidirectional charger circuit according to claim 7, which is characterized in that primary side switch pipe and secondary-side switch pipe The duty ratio for controlling signal is 50%；Under positive battery charging mode according to user, by adjusting primary side switch pipe and secondary-side switch pipe Switching frequency, come adjust DC/DC conversion module output battery charging voltage；Under Opposed crossing electricity output mode, pass through The switching frequency of primary side switch pipe and secondary-side switch pipe is adjusted, to adjust the DC bus-bar voltage of DC/DC conversion module output；In Under both of which, DC bus-bar voltage all follows the voltage for the power battery pack connecting with DC/DC conversion module to be adjusted.

9. vehicle-mounted bidirectional charger circuit according to claim 8, which is characterized in that under positive battery charging mode according to user, The battery charging voltage value of DC/DC conversion module setting subtracts the battery charging voltage instantaneous value of DC/DC conversion module output, Difference enters Voltage loop PI adjusting, obtains the first difference；The battery charge current value of DC/DC conversion module setting subtracts DC/DC The battery charge instantaneous value of conversion module output, difference enter electric current loop PI adjusting, obtain the second difference；It is poor by first Value takes the switching frequency of smaller value de-regulation primary side switch pipe and secondary-side switch pipe compared with the second difference.

10. vehicle-mounted bidirectional charger circuit according to claim 8, which is characterized in that in Opposed crossing electricity output mode Under, the linear voltage value of DC/DC conversion module setting subtracts the busbar voltage instantaneous value of DC/DC conversion module output, difference It is adjusted into Voltage loop PI, obtains third difference；The bus current value of DC/DC conversion module setting subtracts DC/DC conversion module The bus current instantaneous value of output, difference enter electric current loop PI adjusting, obtain the 4th difference；By third difference and the 4th difference It compares, takes the switching frequency of smaller value de-regulation primary side switch pipe and secondary-side switch pipe.

[technical field]

The present invention relates to Vehicular charger more particularly to a kind of vehicle-mounted bidirectional charger circuits of electric car.

[background technique]

There are two types of mainstream topological structures for traditional great power bidirectional electric car Special vehicle-mounted charger main circuit.First Kind, the full bridge rectifier that rectifying part uses four high frequency MOS to constitute, the part DC uses BOOST+BUCK+LLC topology knot The topological circuit of structure, this scheme is complicated, and cost is high；Second, rectifying part is whole using the full-bridge that four high frequency MOS are constituted Current circuit, DC adopt CLLC topological structure in part.The topology of this scheme generates two gains using CLLC topology, and product is stablized Property substantially reduce, while rectifying part uses four high frequency metal-oxide-semiconductors, and the part DC will use two groups of resonant capacitances, two groups of resonance electricity Sense, structure is complicated, and cost is also relatively high.

[summary of the invention]

A kind of the technical problem to be solved in the present invention is to provide circuit structures simple, lower-cost electric car it is vehicle-mounted Bidirectional charger circuit.

In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that, a kind of the vehicle-mounted of electric car two-way is filled Motor circuit, including rectification module, DC/DC conversion module and control circuit, rectification module meet DC/DC by DC bus and convert Module, the operating mode of vehicle-mounted bidirectional charger circuit include positive battery charging mode according to user and Opposed crossing electricity output mode；In Under positive battery charging mode according to user, rectification module works as full bridge PWM rectification circuit, and DC/DC conversion module is as full-bridge LLC rectification circuit works；Under Opposed crossing electricity output mode, DC/DC conversion module as full-bridge LC rectification circuit into Row work, rectification module work as full bridge inverter.

Above-described vehicle-mounted bidirectional charger circuit, rectification module include ac filter capacitor, the first inductance, the first mother 4 switching tubes that line capacitance is connected with bridge-type, two switching tubes of the first half-bridge use metal-oxide-semiconductor, two switches of the second half-bridge Pipe is managed using IGBT；When rectification module is worked as full bridge PWM rectification circuit, the first inductance is as boost inductance；When When rectification module is worked as full bridge inverter, the first inductance is as ac filter inductance.

Above-described vehicle-mounted bidirectional charger circuit, when rectification module is worked as full bridge PWM rectification circuit, The control signal of second switching tube of half-bridge two is that lagging leg sends out wave waveform, and for switching frequency in 40HZ~60HZ, waveform is complementary, opens Close frequency following input AC electricity；The control signal of first switching tube of half-bridge two is that leading arm sends out wave waveform, and switching frequency is Fixed HF switch frequency obtains stable DC bus-bar voltage by adjusting the duty ratio of first two switching tubes of half-bridge.

Above-described vehicle-mounted bidirectional charger circuit, DC bus-bar voltage setting value subtract instantaneous DC bus-bar voltage Value, the difference of generation enter Voltage loop PI adjusting, and the numerical value that Voltage loop PI is adjusted multiplies to be counted in input voltage instantaneous value According to, then subtract input current instantaneous value obtain difference enter electric current loop PI adjusting, obtain PWM value and remove two switching tubes of the first half-bridge Duty ratio.

Above-described vehicle-mounted bidirectional charger circuit, when rectification module is worked as full bridge inverter, the The control signal of two switching tubes of half-bridge two is that lagging leg sends out wave waveform, and fixed hair wave frequency rate is set to 50HZ, and waveform is complementary；First The control signal of two switching tubes of half-bridge is that leading arm sends out wave waveform, and switching frequency is fixed HF switch frequency, the first half The duty ratio of two switching tubes of bridge progressively increases to maximum value from zero, then is gradually reduced to zero from maximum value, to obtain 50HZ Sine wave.

Above-described vehicle-mounted bidirectional charger circuit, the voltage value for exporting setting subtract instantaneous output voltage value generation Difference enters Voltage loop PI adjusting, obtains the duty ratio duty ratio of two switching tubes of the first half-bridge of PWM value de-regulation,.

Above-described vehicle-mounted bidirectional charger circuit, DC/DC conversion module include transformer, primary circuit and secondary side electricity Road, primary circuit include 4 primary side switch pipes that the second bus capacitor, resonant capacitance, resonant inductance are connected with bridge-type, secondary side electricity Road includes 4 secondary-side switch pipes that DC filter capacitor is connected with bridge-type；The midpoint of two half-bridges of primary side bridge circuit connects resonance The midpoint of the series circuit of capacitor, resonant inductance and transformer primary winding, secondary two half-bridges of side bridge circuit connects transformer Vice-side winding.

The duty ratio that above-described vehicle-mounted bidirectional charger circuit, primary side switch pipe and secondary-side switch manage signal processed is equal It is 50%；Under positive battery charging mode according to user, by adjusting the switching frequency of primary side switch pipe and secondary-side switch pipe, to adjust The battery charging voltage of DC/DC conversion module output；Under Opposed crossing electricity output mode, by adjusting primary side switch pipe and pair The switching frequency of side switching tube, to adjust the DC bus-bar voltage of DC/DC conversion module output；In both modes, direct current is female Line voltage all follows the voltage for the power battery pack connecting with DC/DC conversion module to be adjusted.

Above-described vehicle-mounted bidirectional charger circuit, under positive battery charging mode according to user, the setting of DC/DC conversion module Battery charging voltage value subtracts the battery charging voltage instantaneous value of DC/DC conversion module output, and difference enters Voltage loop PI tune Section, obtains the first difference；The battery charge current value of DC/DC conversion module setting subtracts the battery of DC/DC conversion module output Charging current instantaneous value, difference enter electric current loop PI adjusting, obtain the second difference.By the first difference compared with the second difference Compared with taking the switching frequency of smaller value de-regulation primary side switch pipe and secondary-side switch pipe.

Above-described vehicle-mounted bidirectional charger circuit, under Opposed crossing electricity output mode, the setting of DC/DC conversion module Linear voltage value subtract DC/DC conversion module output busbar voltage instantaneous value, difference enter Voltage loop PI adjusting, obtain Third difference；The bus current value of DC/DC conversion module setting subtracts the bus current instantaneous value of DC/DC conversion module output, Its difference enters electric current loop PI adjusting, obtains the 4th difference.Third difference is compared with the 4th difference, takes smaller value de-regulation The switching frequency of primary side switch pipe and secondary-side switch pipe.

Vehicle-mounted bidirectional charger of the invention is at low cost, power density is high, can realize high-power output with lesser volume.

[Detailed description of the invention]

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 1 is vehicle-mounted bidirectional charger circuit main circuit topology figure of the embodiment of the present invention.

Fig. 2 is rectification module topological diagram of the embodiment of the present invention.

Fig. 3 is one waveform diagram of rectification module of embodiment of the present invention operating mode.

Fig. 4 is one loop control principle drawing of rectification module of embodiment of the present invention operating mode.

Fig. 5 is two waveform diagram of rectification module of embodiment of the present invention operating mode

Fig. 6 is rectification module implementation pattern Second Ring Road control principle drawing of the embodiment of the present invention.

Fig. 7 is DC/DC conversion module topological diagram of the embodiment of the present invention.

Fig. 8 is DC/DC conversion module waveform diagram of the embodiment of the present invention.

Fig. 9 is one loop control principle drawing of DC/DC conversion module of embodiment of the present invention operating mode.

Figure 10 is DC/DC conversion module operating mode Second Ring Road control principle drawing of the embodiment of the present invention.

[specific embodiment]

Vehicle-mounted bidirectional charger circuit main circuit topology of the embodiment of the present invention is as shown in Figure 1, include rectification module, DC/DC Conversion module and control circuit.Rectification module connects DC/DC conversion module by DC bus, and vehicle-mounted bidirectional charger circuit has Two operating modes, the Opposed crossing electricity output mode of positive battery charging mode according to user and mode two including mode one.

Under positive battery charging mode according to user, rectification module works as full bridge PWM rectification circuit, DC/DC modulus of conversion Block works as full-bridge LLC rectification circuit；Under Opposed crossing electricity output mode, DC/DC conversion module is as full-bridge LC Rectification circuit works, and rectification module works as full bridge inverter.

As shown in Figure 1, it is whole once, after alternating current Vin input by 4 days to close pipe Q1, Q2, Q3, Q4 full bridge PWM in mode Busbar voltage Vbus is flowed, it is complete using 8 switching tubes Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12 after reaching 370Vdc~470Vdc Bridge LLC rectification, so that 250Vdc~450Vdc voltage output be reached to charge power battery pack.Under mode two, 250Vdc The power battery voltage of~450Vdc realizes full-bridge LC rectification by 8 metal-oxide-semiconductors Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12, After reaching 300Vdc~470Vdc busbar voltage, then by 4 metal-oxide-semiconductor Q1, Q2, Q3, Q4 full-bridge invertings, 250Vdc~ Stable 220Vac exchange electricity output can be realized in 450Vdc gamut.

As shown in Fig. 2, mode one is by filter capacitor C1, boost inductance L1, metal-oxide-semiconductor Q1, Q2, IGBT pipe Q3, Q4, bus electricity It solves capacitor C2 and constitutes a full bridge PWM rectification circuit.Mode two by bus electrolytic capacitor C2, metal-oxide-semiconductor Q1, Q2, IGBT pipe Q3, Q4, filter capacitor C1, ac filter inductance L1 constitute a full bridge inverter.

In Fig. 3, the AC power input waveform that Vin refers to, Q3, Q4 be lagging leg send out wave waveform, switching frequency 40HZ~ 60HZ, waveform is complementary, follows input AC electric forever, however Q1, Q2 are that leading arm sends out wave waveform, and switching frequency is fixed high frequency Switching frequency obtains stable DC bus-bar voltage, and power factor asymptotic 1 by adjusting Q1, Q2 duty ratio.

In Fig. 4, rectification module works in the loop of mode one, the voltage value for the busbar voltage setting that Vref refers to, Vbus The instantaneous bus voltage value referred to, IS1 input current instantaneous value, Vin input voltage instantaneous value.Vref subtracts the difference of Vbus generation It is adjusted into Voltage loop PI, obtained value, which multiplies, obtains data in Vin, then subtracts the raw error amount of IS1 and enter electric current loop PI adjusting, obtains To PWM value de-regulation S1, S2 duty ratio.

In Fig. 5, the output ac power waveform that Vin refers to, Q3, Q4 are that lagging leg sends out wave waveform, and fixed hair wave frequency rate is set to 50HZ, waveform is complementary, however Q1, Q2 are that leading arm sends out wave waveform, and switching frequency is fixed HF switch frequency, Q1, Q2 duty Than progressively increasing to maximum value from zero, then it is gradually reduced to zero from maximum value, to obtain 50HZ sine wave.

In Fig. 6, rectification module works in the loop of mode two, and what Vref1 referred to exports the voltage value set, what Vin referred to Instantaneous output voltage value, IS1 export current instantaneous value, Vin input voltage instantaneous value.The difference that Vref1 subtracts Vin generation enters Voltage loop PI is adjusted, and obtains PWM value de-regulation S1, S2 duty ratio, IS1 is not involved in loop here, only does output overcurrent protection.

In Fig. 7, mode is first is that by bus electrolytic capacitor C3, primary side metal-oxide-semiconductor Q5, Q6, Q7, Q8, resonant capacitance C4, resonance Inductance L2, main transformer T1-A, secondary side metal-oxide-semiconductor Q9, Q10, Q11, Q12, it is electric that filter capacitor C6 constitutes the synchronous full-bridge LLC of a band Road.Mode is second is that by input capacitance C6, primary side metal-oxide-semiconductor Q9, Q10, Q11, Q12, main transformer T1-A, secondary side metal-oxide-semiconductor Q5, Q6, Q7, Q8, resonant capacitance C4, resonant inductance L2, main transformer T1-A, bus electrolytic capacitor C3 constitute a full-bridge lc circuit.

In fig. 8, respectively 8 metal-oxide-semiconductors of Q5, Q6, Q7, Q8, Q9, Q10, Q11, Q12 send out wave waveform, no matter work in Mode one is also operate on mode two, and all, duty ratio is 50% to hair wave.Unlike, work in mode for the moment, input 250Vdc~450Vdc voltage output is realized to obtain for busbar voltage Vbus by adjusting 8 metal-oxide-semiconductor switching frequencies, from And reach and charge to power battery pack, it when operating mode two, inputs as power battery pack Vout, is switched by adjusting 8 metal-oxide-semiconductors Frequency, to obtain stable busbar voltage Vbus.Both of which busbar voltage Vbus requires to follow power battery pack Vout It is adjusted, if power battery pack Vout declines, busbar voltage Vbus follows downward, strives for obtaining maximum gain.

Fig. 9 is that DC/DC conversion module works in one loop figure of mode, the voltage value for the output setting that Vref2 refers to, Iref refers to Output setting current value, the instantaneous output voltage value that Vout refers to, IS2 export current instantaneous value.Vref2 subtracts Vout generation Difference enter Voltage loop PI adjusting, obtain COMP1 value.The difference that Iref subtracts IS2 generation enters electric current loop PI adjusting, obtains COMP2 value.COMP1 value compares with COMP2 value, takes smaller value de-regulation S5, S6, S7, S8, S9, S10, S11, S12 switch frequency Rate.

Figure 10 is that DC/DC conversion module works in mode Second Ring Road figure, and what Vref3 referred to exports the bus voltage value set, The current value for the output setting that Iref refers to, the instantaneous bus voltage value that Vbus refers to, IS2 export current instantaneous value.Vref3 is subtracted The difference that Vbus is generated enters Voltage loop PI adjusting, obtains COMP3 value.The difference that Iref subtracts IS2 generation enters electric current loop PI It adjusts, obtains COMP4 value.COMP3 value compares with COMP4 value, take smaller value de-regulation S5, S6, S7, S8, S9, S10, S11, S12 switching frequency.

The vehicle-mounted bidirectional charger circuit of above embodiments of the present invention has the advantages that

1) under positive battery charging mode according to user, alternating current 220Vac is rectified by full bridge PWM, reaches 370Vdc~470Vdc It after busbar voltage, is rectified using full-bridge LLC, realizes 250Vdc~450Vdc voltage output, power battery pack is filled to reach Electricity.

2) under Opposed crossing electricity output mode, 250Vdc~450Vdc power battery voltage is rectified by full-bridge LC, After reaching 300Vdc~470Vdc busbar voltage, using full-bridge inverting, it can be realized in real 250Vdc~450Vdc gamut steady Fixed 220Vac exchanges electricity output.

3) in full bridge PWM rectification topology, two switching tubes of the second half-bridge are managed using IGBT, and working frequency is in low Frequently, ac frequency is followed, can be good at reducing cost.

The vehicle-mounted bidirectional charger circuit main circuit cost of implementation of above embodiments of the present invention is low, power density is high, can use Lesser volume realizes the two-way biography energy of the vehicle-mounted charger of bidirectional electric automobile specified.