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A cascade inverter for electric vehicle drive charging and braking energy recovery

A technology for electric vehicles and energy recovery, applied in electric vehicle charging technology, electric vehicles, battery/battery traction, etc., can solve the problems of high control signal frequency, large inverter output waveform distortion rate, and large inverter switching loss and other problems, to achieve the effect of small switching loss and saving special charging devices

Active Publication Date: 2019-05-31
陈钢 +1
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AI Technical Summary

Problems solved by technology

[0002] Existing AC inverters for electric vehicles use the DC output from the battery to convert the three-phase AC output through the inverter to the motor to drive the vehicle. Most of the control uses PWM modulation, and the high frequency of the control signal causes great interference to the outside world. In addition, the inverter The distortion rate of the output waveform is also large, and the most important thing is that the switching loss of the inverter is large

Method used

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  • A cascade inverter for electric vehicle drive charging and braking energy recovery
  • A cascade inverter for electric vehicle drive charging and braking energy recovery
  • A cascade inverter for electric vehicle drive charging and braking energy recovery

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Embodiment Construction

[0037] Below in conjunction with accompanying drawing, the present invention will be further described:

[0038] In the step inverter used for electric vehicle drive charging and braking energy recovery in the present invention, the step inverter adopts three different H bridges to form an inverter unit bridge, and the inverter unit bridge includes a main inverter unit and two Auxiliary inverter unit.

[0039] Three different H-bridges share a DC voltage source, and different H-bridges generate voltages of different amplitudes, and the voltages of different amplitudes are synthesized into approximate sinusoidal waveforms through series-connected transformers.

[0040] The single-phase or three-phase ladder inverter consists of three inverter unit bridges with different ratings connected to single-phase or three-phase transformers with different winding ratios and different capacities, and one of the inverter unit bridges is the main inverter unit , the other two auxiliary inv...

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Abstract

The invention relates to a step inverter for electric vehicle driving charging and brake energy recovery, which is characterized in that the step inverter adopts three different H bridges to form an inverter unit bridge; the inverter unit bridge comprises a main inverter unit and two auxiliary inverter units; the three different H bridges share one DC voltage source; different H bridges generate voltage of different amplitudes; and the voltage of different amplitudes is synthesized into an approximate sinusoidal waveform through serially-connected transformers. According to the step inverter of the invention, through synthesizing the voltage of different amplitudes to obtain the approximate sinusoidal wave AC to drive the motor, the driving function of the motor, the charging function of a vehicle-used battery and a brake energy recovery function can be integrated on the same part. The step inverter and a super capacitor are connected in parallel, the charging rate and the discharging rate can be greatly improved, the electric vehicle brake and the energy recovery effects can be improved, and the start power of the electric vehicle is increased.

Description

technical field [0001] The invention relates to a cascade inverter used for driving, charging and braking energy recovery of electric vehicles. Background technique [0002] Existing AC inverters for electric vehicles use the DC output from the battery to convert the three-phase AC output through the inverter to the motor to drive the vehicle. Most of the control uses PWM modulation, and the high frequency of the control signal causes great interference to the outside world. In addition, the inverter The distortion rate of the output waveform is also large, and the most important thing is that the switching loss of the inverter is large. Contents of the invention [0003] Aiming at the problems existing in the prior art, the object of the present invention is to provide a technical solution for a step inverter used for electric vehicle drive charging and braking energy recovery, using a step inverter with a new topology to invert the DC It is an approximate AC sine wave t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02J7/00H02J7/32B60L53/31
CPCB60L50/50H02J7/00H02J7/32H02M7/5387Y02T10/70Y02T10/7072Y02T10/72Y02T90/12
Inventor 亓明陈钢
Owner 陈钢
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