Delta Electronics (shanghai) Co., Ltd

Boyu Pu

Yi Zhang

Hailong Wang

Jianping Ying

Ming Hsi Wang

Wei Zhu Chen

Zheng Wang

Jinping Zhou

Zhao Wang

Lifeng Qiao

Peng Xiao

Hongwei Xiao

The present disclosure discloses a method of discharging a bus capacitor in a power converter, the method comprising: outputting a plurality of pulse control signals to the corresponding plurality of power semiconductor switch groups when the working state of the power converter is in a discharge state and the state of the main circuit breaker is open to control the ON and OFF of the plurality of power semiconductor switch groups, respectively, so as to form a discharge loop between the positive terminal and the negative terminal of the bus capacitor within at least a preset time, thereby causing the bus capacitor to discharge. Since a discharge loop is formed by the bus capacitor and the bridge arms and the energy of the bus capacitor is consumed by a power device, thereby the peak value and discharge rate of discharge current can be effectively controlled without adding additional discharge elements.

Discharge control method for bus capacitor in power converter

The present disclosure relates to a system and method for pulse driving. The system is configured to drive a multi-level converter, including: a main control module generating encoding information which contains driving information according to sampling information; a local control module electrically coupled to the multi-level converter to output control signals to the multi-level converter so as to control on and off of the at least M power switches in the multi-level converter; a first optical fiber coupled to the main control module and the local control module, wherein the local control module receives the encoding information output from the main control module via the first optical fiber and generates the control signals according to the encoding information.

System and method for pulse driving for reducing number of optical fibers

A three-phase rectification module, the system thereof and harmonic suppression method are provided. The module includes an LCL filter unit, a Vienna rectifier coupled to the LCL filter unit, and a rectifier control unit for controlling the power factor of the three-phase AC power source and the DC output voltage of the Vienna rectifier. A commutation diode is serially connected on the bridge-arm of each set of uni-directional rectification branches which are included in the Vienna rectifier, making it function as current uni-directionally. Herein, the power factor of the three-phase AC power source is matched with the parameters of the LCL filter unit, such that the absolute value of the phase difference between the AC input voltage and the current of the Vienna rectifier is close or equal to zero.

Three-phase rectification module, the system thereof and harmonic suppression method

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Shanghai, China

Boyu Pu