CN105375780A - Vehicle soft switching inversion power supply and voltage conversion circuit thereof - Google Patents
Vehicle soft switching inversion power supply and voltage conversion circuit thereof Download PDFInfo
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Abstract
The invention relates to a vehicle soft switching inversion power supply. The vehicle soft switching inversion power supply comprises a power push-pull module, an output terminal of the power push-pull module is connected with a primary of a transformer, a secondary of the transformer is connected with a sine pulse width modulation module via a rectification module, a voltage conversion circuit of the vehicle soft switching inversion power supply is also provided with a digital controller, and the digital controller is connected with the power push-pull module via an isolation transmission module. The vehicle soft switching inversion power supply is characterized in that the secondary of the transformer is connected with a phase-shifting network, an output terminal of the phase-shifting network is connected with an input terminal of the rectification module, the phase-shifting network converts output current of the transformer to sine wave current, the digital controller samples the output of the phase-shifting network, and switching control of a high-power tube of the power push-pull module is performed at a zero-crossing point of the sine wave current. The vehicle inversion power supply is advantageous in that the size is small, the conversion efficiency is high, and the electromagnetic compatibility is good.
Description
Technical field
The present invention relates to Mobile inverse power source field, be specially a kind of vehicle-mounted Soft-switching inverter and voltage conversion circuit thereof.
Background technology
Mobile inverse power source is that the direct current in automobile engine or automobile storage battery is converted to alternating current, for general electric equipment products, is one more conveniently power supply on vehicle conversion equipment.It is conventional automobile-used automotive electronics articles for use.The electrical equipment that our use civil power at ordinary times can be used on automobile to work or to charge by it and digital product, as television set, notebook computer, mobile phone, electric drill, medical first aid instrument, military mobile unit etc., can be applicable to every profession and trade field.Divide according to output waveform, Mobile inverse power source can be divided into sinewave output and square wave to export two kinds.The former can provide continual high-quality alternating current, can adapt to any load, but its technical requirement and cost high, circuit structure more complicated.The alternating current that the latter provides second-rate, and load capacity is poor, can not connect " inductive load ".Though there is more shortcoming, but its technical requirement is low, and volume is little, and circuit is simple, and price is low.
It is large to there is power volume in the inversion that existing Mobile inverse power source mainly adopts hard switching to complete whole voltage, and conversion efficiency is low, and Electro Magnetic Compatibility difference waits series of problems.Existing Mobile inverse power source adopts hard switching technical controlling block diagram as shown in Figure 1, comprise power and recommend module, transformer, rectification module, digitial controller and isolated transmission module, recommend model calling by digitial controller by isolated transmission module and power, the high power valve of power being recommended to module carries out switching controls.The Q1 conducting when positive half cycle, Q2 ends, voltage now on Q2 to be down to the process of zero along with electric current from zero to maximum change procedure from supply voltage, the value of dv/di is very large thus bring very large turn-on consumption in this process, end Q2 conducting at negative half-cycle Q1, the voltage around here on Q1 from zero to rise to the process of supply voltage electric current from maximum reduce to zero this also make the value of dv/di very large thus produce very large turn-off power loss.And existing Mobile inverse power source SPWM bridge is all generally two high speed arm metal-oxide-semiconductors, two low speed arm metal-oxide-semiconductors, therefore on two high speed arm pipes, switching loss is comparatively large, and two low speed arm pipe switching losses are very little, so four pipe works are that thermal stress is extremely uneven.
Summary of the invention
The object of this invention is to provide the vehicle-mounted Soft-switching inverter that a kind of conversion efficiency is high, Electro Magnetic Compatibility is good.
To achieve these goals, technical scheme of the present invention is as follows: a kind of vehicle-mounted Soft-switching inverter, comprise power and recommend module, power is recommended the output of module and is connected with the elementary of transformer, transformer secondary by rectification module and sinusoidal pulse width modulation model calling, described vehicle-mounted Soft-switching inverter voltage conversion circuit is also provided with digitial controller, described digitial controller recommends model calling by isolated transmission module and power, it is characterized in that the secondary of described transformer and is shifted to network and be connected, the input of the described output and rectification module of shifting to network is connected, shift to network and transformer output current is converted to sine-wave current, digitial controller is sampled to the output shifting to network, when described sine-wave current zero crossing, module high power valve is recommended to power and carry out switching controls.
Another object of the present invention is to provide the vehicle-mounted Soft-switching inverter voltage conversion circuit that a kind of conversion efficiency is high, Electro Magnetic Compatibility is good.
To achieve these goals, technical scheme of the present invention is as follows: a kind of vehicle-mounted Soft-switching inverter voltage conversion circuit, comprise power and recommend module, power is recommended the output of module and is connected with the elementary of transformer, the secondary of transformer is connected with rectification module, described vehicle-mounted Soft-switching inverter voltage conversion circuit is also provided with digitial controller, described digitial controller recommends model calling by isolated transmission module and power, it is characterized in that the secondary of described transformer and is shifted to network and be connected, the described output shifting to network is connected with rectification module, shift to network and transformer output current is converted to sine-wave current, digitial controller is sampled to the output shifting to network, when described sine-wave current zero crossing, module high power valve is recommended to power and carry out switching controls.
Described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises a sampling module, the input of described sampling module is connected with the output of rectification module, the output of sampling module is connected with digitial controller, sampling module gathers the voltage of rectification module output, when the voltage of rectification module output is less than set point, then digitial controller judges described sine-wave current zero crossing.
Another object of the present invention is to provide the control method of the vehicle-mounted Soft-switching inverter that a kind of conversion efficiency is high, Electro Magnetic Compatibility is good.
To achieve these goals, technical scheme of the present invention is as follows: a kind of control method of vehicle-mounted Soft-switching inverter, it is characterized in that Vehicular accumulator cell provides 12V direct voltage to switch transformer T1, the first power tube conducting of push-pull circuit, second largest power tube cut-off, 12V direct voltage is chopped into 12V square-wave voltage, in the process of copped wave, transformer secondary output makes the electric current unsteady state operation in transformer become sine-wave current through phase-shift network, when sinusoidal current first time zero crossing, first power tube realizes zero current passing, when second time zero crossing, first power tube realizes zero-current switching, second largest power tube realizes zero current passing simultaneously, transformer secondary output output square-wave voltage is sent into rectification module and voltage is become 320V pulse dc high voltage after phase-shift network, power to after high-pressure electrolysis filtering alternately SPWM inverter bridge, alternately DC bus-bar voltage is transformed into the modified sine wave voltage of 50HZ by SPWM inverter bridge, the sine wave of 50HZ is become through LC filter filtering, pure sine wave alternating current is become finally by the filtering of output electromagnetic interface filter.
Advantage applies of the present invention following some:
1. Mobile inverse power source of the present invention when Same Efficieney grade than existing product volume-diminished 2-3 doubly;
2. Mobile inverse power source conversion efficiency of the present invention is at least than existing product conversion efficiency height 3-6%;
3. existing Mobile inverse power source is because adopt hard switching inversion, because there is very big current noise in the process of hard switching, therefore existing Mobile inverse power source Electro Magnetic Compatibility is poor, and Mobile inverse power source of the present invention is owing to adopting soft-switching inversion, and therefore Electro Magnetic Compatibility is good.
Accompanying drawing explanation
Fig. 1 is existing Mobile inverse power source hard switching technical controlling block diagram.
Fig. 2 is Mobile inverse power source soft switch technique control block diagram of the present invention.
Fig. 3 is soft or hard switching technique switching process loss comparison diagram.
Fig. 4 is all-digitized demodulator module Sofe Switch control flow chart.
Fig. 5 is the vehicle-mounted 150w inverter control block diagram of one embodiment of the invention.
Fig. 6 is the circuit diagram of SPWM inverter bridge.
Embodiment
As shown in Figure 2, a kind of vehicle-mounted Soft-switching inverter voltage conversion circuit, comprise power and recommend module 1, the output that power recommends module is connected with the elementary of transformer T1, secondary and the rectification module 3 of transformer T1 is connected, described vehicle-mounted Soft-switching inverter voltage conversion circuit is also provided with digitial controller 5, described digitial controller 5 is recommended module 1 by isolated transmission module 6 and power and is connected, it is characterized in that the secondary of described transformer and shift to network 7 and be connected, the described output shifting to network 7 is connected with rectification module 3, shift to network 7 and transformer output current is converted to sine-wave current, digitial controller 5 is sampled to the output current shifting to network 7, when described sine-wave current zero crossing, switching controls is carried out to the high power valve that power recommends module 1.
Module is recommended primarily of power in vehicle-mounted Soft-switching inverter voltage transformation loop, high frequency switch transformer T1, phase-shift network, rectification module, isolated transmission module U2, digitial controller U1 form.Its operation principle is as follows:
Vehicular accumulator cell BAT+ provides 12V direct current to switch transformer T1, first power tube Q1, second largest power tube Q2 forms power and recommends loop (circuit switching frequency 80KHz), its drive singal is driven through isolated transmission module by digitial controller, 12V direct current transfers to secondary output by transformer after push-pull circuit copped wave, export square-wave voltage changes voltage and electric current in transformer phase place through phase-shift network, obtain sine-wave current, export high direct voltage to rectification module rectification.Export high direct voltage and reach the stable object exported through sampling circuit sampling feedback to digitial controller Frequency-variable Modulation.Below analyze monolateral switch process: end at positive half period first power tube Q1 conducting, second largest power tube Q2, the elementary of transformer flows through square wave current, the secondary induction of transformer is to this electric current, and this electric current makes the electric current unsteady state operation in loop be sine-wave current (LC loop resonance frequency in phase-shift network through phase-shift network phase shift
), because phase-shift network produces 180 ° delayed to the current phase flowing through first power tube Q1, therefore the electric current that MOS flows through in the early stage that first power tube Q1 conducting starts becomes large gradually by zero, but the voltage on first power tube Q1 is but by gradually diminishing greatly, therefore in whole turn on process, the value of dv/di is all very little, realizes zero current turning-on thus.Before negative half period arrives in phase-shift network electric current again this zero cross signal of zero passage predicted by digitial controller, then control first power tube Q1 and end, thus realize zero-current switching.Electric current on negative half-cycle second largest power tube Q2 is also like this, no longer sets forth.
And the first power tube Q1 conducting when positive half cycle of existing vehicle-mounted inverter, second largest power tube Q2 ends, voltage now on second largest power tube Q2 to be down to the process of zero along with electric current from zero to maximum change procedure from supply voltage, the value of dv/di is very large thus bring very large turn-on consumption in this process, end at the first power tube Q1 of negative half-cycle, second largest power tube Q2 conducting, voltage around here on first power tube Q1 from zero rise to electric current the process of supply voltage from maximum reduce to zero this also make the value of dv/di very large thus produce very large turn-off power loss.
The metal-oxide-semiconductor loss comparison diagram of soft or hard switch in switching process shown in Fig. 3.Dotted line is expressed as the loss of metal-oxide-semiconductor in prior art hard switching process, wherein hatched triangle part is hard switching metal-oxide-semiconductor loss in switching process, bold portion is metal-oxide-semiconductor loss in Sofe Switch process of the present invention, and wherein triangle black graphics is the switching loss of Sofe Switch.In figure, ID represents the electric current flow through on metal-oxide-semiconductor, and VDS represents the voltage on metal-oxide-semiconductor, and Ith represents current value relevant with loss in switching process, and VDSth represents magnitude of voltage relevant with loss in switching process, and TSW represents in switching process the time producing loss.This shows, the switching loss of Sofe Switch of the present invention is far smaller than hard switching metal-oxide-semiconductor loss in switching process of prior art.
It is all-digitized demodulator module Sofe Switch control flow shown in Fig. 4, system initialization powers on, phase-shift network output signal first time zero passage detected, digital control module control Q1 conducting, Q2 cut-off then start to sample export HV+ voltage magnitude when HV value lower than the minimum of software set then think sine-wave current for the second time zero crossing arrive now digitial controller immediately control Q1 end, Q2 conducting, if the amplitude sampled is greater than minimum limit value, continues to keep Q1 conducting, the state of Q2 cut-off.If system zero crossing arrival digitial controller switching Q1, Q2 state for the second time, digital control module continues the amplitude of sampling HV+ is simultaneously that zero passage switching controls is prepared next time.Namely detect that rectification module output voltage amplitude then thinks sine-wave current zero passage lower than the minimum of software set at every turn, so go round and begin again to predict that zero crossing is to the switch conduction of control Q1, Q2 to reach the object of soft switch conversion.
The vehicle-mounted pure sine wave inverter of a 150W according to above-mentioned Sofe Switch mechanismic design, comprise vehicle-mounted Soft-switching inverter voltage conversion circuit, and the sinusoidal pulse width modulation module to be connected with vehicle-mounted Soft-switching inverter voltage conversion circuit, described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises power and recommends module 1, the output that power recommends module 1 is connected with the elementary of transformer 2, the secondary of transformer 2 is connected with sinusoidal pulse width modulation module 4 by rectification module 3, described vehicle-mounted Soft-switching inverter voltage conversion circuit is also provided with digitial controller 5, described digitial controller 5 is recommended module 1 by isolated transmission module 6 and power and is connected, it is characterized in that the secondary of described transformer and shift to network 7 and be connected, the described output shifting to network 7 is connected with the input of rectification module 3, shift to network 7 and transformer 2 output current is converted to sine-wave current, digitial controller 5 is sampled to the output shifting to network 7, when described sine-wave current zero crossing, switching controls is carried out to the high power valve that power recommends module 1.Fig. 5 is the control block diagram of this vehicle-mounted inverter.Described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises a sampling module 8, and wherein digitial controller 5 is sampled by the output voltage exporting sampling module 8 pairs of rectification modules 3, to judge to shift to sine-wave current that network exports whether zero crossing.When the voltage of rectification module output is less than set point, then digitial controller judges described sine-wave current zero crossing.
12V cell voltage and ACC voltage are recommended module 1 to power and are powered after electromagnetic interface filter (Electromagnetic interference filter) 9 filtering, being chopped into transformer secondary output in the process of 12V square-wave voltage in copped wave at positive half period Q1 conducting Q2 cut-off 12v voltage makes the electric current unsteady state operation in transformer become sine-wave current through phase-shift network, the output of sampling module to rectification module is utilized to sample, sinusoidal current first time zero crossing Q1 realizes zero current turning-on, and when second time zero crossing, Q1 realizes zero-current switching.Identical with positive half period operation principle at negative half-cycle.Transformer secondary output output square-wave voltage is sent into rectification module and voltage is become 320V pulse dc high voltage after phase-shift network, power to after high-pressure electrolysis filtering alternately SPWM inverter bridge, DC bus-bar voltage is transformed into the modified sine wave of 50HZ by SPWM inverter bridge, the sine wave of 50HZ is become through LC filter filtering, pure sine wave alternating current is become, namely our usually said civil power finally by output electromagnetic interface filter filtering.
In this embodiment, digital control employing be voltage prediction method, namely indirectly judge electric current on prime metal-oxide-semiconductor whether zero passage by the amplitude of output voltage of rectifier of sampling.In prior art, the general way adopting Direct Sampling current zero-crossing point, voltage prediction method compares the soft switch technique of Direct Sampling current zero-crossing point, has following difference:
If a) adopt the way of prime sample rate current zero crossing, usual needs are connected in series current sensor on prime metal-oxide-semiconductor, prime will be caused like this can only to adopt flyback topologies circuit structure, the power stress of flyback metal-oxide-semiconductor can be caused so very large, easily cause metal-oxide-semiconductor to damage.And the flyback soft switching power of the type can only accomplish power less (being generally no more than 300W).
If b) way of sample rate current zero crossing also adopts push-pull topology to do prime, two current sensors are then needed to be serially connected on two MOS loops, do not only small product size like this to increase, and push-pull circuit two Transformer Winding magnetic flux imbalances can be caused to cause power supply to damage because of the inconsistency of transducer.
This vehicle-mounted inverter is also provided with a current sample module 10; the input of described current sample module is connected with alternately SPWM inverter bridge; the output of current sample module is connected with control module, and the electric current gathering output loading is used for the input reference of overcurrent and short-circuit protection.
The Mobile inverse power source conversion efficiency adopting soft switch technique to make through actual test comparison is 92% exceed 4 percentage points than existing hard switching Mobile inverse power source efficiency (88%), but its volume only has the half of existing product.This shows the huge advantage adopting soft switch technique research and development product to bring.
In vehicle-mounted inverter of the present invention, also adopt alternately SPWM inverter bridge to substitute traditional SPWM inverter bridge.
Tradition SPWM inverter bridge comprises four metal-oxide-semiconductors, and by the first metal-oxide-semiconductor Q11, the second metal-oxide-semiconductor Q12 forms the low speed brachium pontis of 50HZ, the 3rd metal-oxide-semiconductor Q13, and the 4th metal-oxide-semiconductor Q14 forms the high speed brachium pontis of 18KHZ.At 50HZ positive half cycle first metal-oxide-semiconductor Q11,4th metal-oxide-semiconductor Q14 conducting, because the 4th metal-oxide-semiconductor Q14 carries out speed-sensitive switch with the frequency of 18K, so very large switching loss can be there is in the 4th metal-oxide-semiconductor Q14 thus cause the 4th metal-oxide-semiconductor Q14 can produce very large heat, and the first metal-oxide-semiconductor Q11 to be low speed switch can not produce loss heating.Negative half-cycle the 3rd metal-oxide-semiconductor Q13 can produce very large heat, and the second metal-oxide-semiconductor Q12 does not generate heat.Therefore the 3rd metal-oxide-semiconductor Q13 in the whole cycle, the 4th metal-oxide-semiconductor Q14 is awfully hot, and the first metal-oxide-semiconductor Q11, the second metal-oxide-semiconductor Q12 do not generate heat, and this just causes 4 metal-oxide-semiconductor thermal stress extremely uneven.
Alternately SPWM inverter bridge first metal-oxide-semiconductor Q11, the second metal-oxide-semiconductor Q12, the 3rd metal-oxide-semiconductor Q13, the 4th metal-oxide-semiconductor Q14 tetra-metal-oxide-semiconductor is all the high speed switch tube of the 9KHZ of equivalence.
At first 50HZ positive half cycle first metal-oxide-semiconductor Q11 as the conducting of 18KHZ high speed arm, the 4th metal-oxide-semiconductor Q14 is as the conducting of 50HZ low speed arm, and now the caloric value of the first metal-oxide-semiconductor Q11 equals the heat that 18KHZ switch MOS pipe produces.
At first 50HZ negative half period second metal-oxide-semiconductor Q12 as the conducting of 18KHZ high speed arm, the 3rd metal-oxide-semiconductor Q13 is as the conducting of 50HZ low speed arm, and now the caloric value of the second metal-oxide-semiconductor Q12 equals the heat that 18KHZ switch MOS pipe produces.
At second the positive half cycle of 50HZ the 3rd metal-oxide-semiconductor Q13 as the conducting of 18KHZ high speed arm, the second metal-oxide-semiconductor Q12 is as the conducting of 50HZ low speed arm, and now the caloric value of the 3rd metal-oxide-semiconductor Q13 equals the heat that 18KHZ switch MOS pipe produces.
At second 50HZ negative half period the 4th metal-oxide-semiconductor Q14 as the conducting of 18KHZ high speed arm, the first metal-oxide-semiconductor Q11 is as the conducting of 50HZ low speed arm, and now the caloric value of the 4th metal-oxide-semiconductor Q14 equals the heat that 18KHZ switch MOS pipe produces.
There is half period loss device in every two cycles in each metal-oxide-semiconductor in sum, thus on each metal-oxide-semiconductor, the switching frequency of equivalence is 9KHZ, caloric value on each pipe is 1/4th of the switching tube caloric value of original 18KHZ, thus the heat load of effective balanced 4 switching tubes, and the maximum temperature on high speed arm two switching tubes is reduced to 1/4th of conventional high rate arm switch pipe temperature.
Claims (6)
1. a vehicle-mounted Soft-switching inverter, comprise vehicle-mounted Soft-switching inverter voltage conversion circuit, and the sinusoidal pulse width modulation module to be connected with vehicle-mounted Soft-switching inverter voltage conversion circuit, described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises power and recommends module, power is recommended the output of module and is connected with the elementary of transformer, transformer secondary by rectification module and sinusoidal pulse width modulation model calling, described vehicle-mounted Soft-switching inverter voltage conversion circuit is also provided with digitial controller, described digitial controller recommends model calling by isolated transmission module and power, it is characterized in that the secondary of described transformer and is shifted to network and be connected, the input of the described output and rectification module of shifting to network is connected, shift to network and transformer output current is converted to sine-wave current, digitial controller is sampled to the output shifting to network, when described sine-wave current zero crossing, module high power valve is recommended to power and carry out switching controls.
2. vehicle-mounted Soft-switching inverter voltage conversion circuit according to claim 1, it is characterized in that, described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises a sampling module, the input of described sampling module is connected with the output of rectification module, and the output of sampling module is connected with digitial controller.
3. vehicle-mounted Soft-switching inverter voltage conversion circuit according to claim 1, it is characterized in that, described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises a current sample module, the input of described current sample module and sinusoidal pulse width modulation model calling, the output of current sample module is connected with digitial controller.
4. a vehicle-mounted Soft-switching inverter voltage conversion circuit, comprise power and recommend module, power is recommended the output of module and is connected with the elementary of transformer, the secondary of transformer is connected with rectification module, described vehicle-mounted Soft-switching inverter voltage conversion circuit is also provided with digitial controller, described digitial controller recommends model calling by isolated transmission module and power, it is characterized in that the secondary of described transformer and is shifted to network and be connected, the described output shifting to network is connected with rectification module, shift to network and transformer output current is converted to sine-wave current, digitial controller is sampled to the output shifting to network, when described sine-wave current zero crossing, module high power valve is recommended to power and carry out switching controls.
5. vehicle-mounted Soft-switching inverter voltage conversion circuit according to claim 4, it is characterized in that, described vehicle-mounted Soft-switching inverter voltage conversion circuit comprises a sampling module, the input of described sampling module is connected with the output of rectification module, and the output of sampling module is connected with digitial controller.
6. the control method of a vehicle-mounted Soft-switching inverter, it is characterized in that Vehicular accumulator cell provides 12V direct voltage to switch transformer, the first power tube conducting of push-pull circuit, second largest power tube cut-off, 12V direct voltage is chopped into 12V square-wave voltage, in the process of copped wave, transformer secondary output makes the electric current unsteady state operation in transformer become sine-wave current through phase-shift network, when sine-wave current first time zero crossing, first power tube realizes zero current passing, when second time zero crossing, first power tube realizes zero-current switching, second largest power tube realizes zero current passing simultaneously, transformer secondary output output square-wave voltage is sent into rectification module and voltage is become 320V pulse dc high voltage after phase-shift network, power to after high-pressure electrolysis filtering alternately SPWM inverter bridge, alternately DC bus-bar voltage is transformed into the modified sine wave voltage of 50HZ by SPWM inverter bridge, the sine wave of 50HZ is become through LC filter filtering, pure sine wave alternating current is become finally by the filtering of output electromagnetic interface filter.
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| CN201410438920.1A CN105375780A (en) | 2014-09-01 | 2014-09-01 | Vehicle soft switching inversion power supply and voltage conversion circuit thereof |
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| CN201410438920.1A CN105375780A (en) | 2014-09-01 | 2014-09-01 | Vehicle soft switching inversion power supply and voltage conversion circuit thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112067865A (en) * | 2020-09-14 | 2020-12-11 | 南方电网科学研究院有限责任公司 | Current source device and direct current fill electric pile check gauge calibrating installation |
| CN112152498A (en) * | 2020-07-30 | 2020-12-29 | 东风商用车有限公司 | Vehicle-mounted conversion power supply |
| CN112572194A (en) * | 2019-09-29 | 2021-03-30 | 比亚迪股份有限公司 | Vehicle-mounted charging system and vehicle with same |
| CN113422532A (en) * | 2021-04-29 | 2021-09-21 | 上海奉天电子股份有限公司 | Variable output power vehicle-mounted power supply inverter circuit of fuel and new energy vehicle |
-
2014
- 2014-09-01 CN CN201410438920.1A patent/CN105375780A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112572194A (en) * | 2019-09-29 | 2021-03-30 | 比亚迪股份有限公司 | Vehicle-mounted charging system and vehicle with same |
| CN112572194B (en) * | 2019-09-29 | 2022-03-18 | 比亚迪股份有限公司 | Vehicle-mounted charging system and vehicle with same |
| CN112152498A (en) * | 2020-07-30 | 2020-12-29 | 东风商用车有限公司 | Vehicle-mounted conversion power supply |
| CN112067865A (en) * | 2020-09-14 | 2020-12-11 | 南方电网科学研究院有限责任公司 | Current source device and direct current fill electric pile check gauge calibrating installation |
| CN113422532A (en) * | 2021-04-29 | 2021-09-21 | 上海奉天电子股份有限公司 | Variable output power vehicle-mounted power supply inverter circuit of fuel and new energy vehicle |
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