The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 2024
Filed:
Sep. 14, 2022
Santak Electronic (Shenzhen) Co., Ltd., Shenzhen, CN;
Jianxiong Yu, Shanghai, CN;
Jiajie Duan, Shanghai, CN;
Qiang Chen, Shanghai, CN;
Han Li, Shanghai, CN;
Cheng Luo, Shanghai, CN;
SANTAK ELECTRONIC (SHENZHEN) CO., LTD., Shenzhen, CN;
Abstract
The present invention provides a Pulse Width Modulation (PWM) method for a Cascaded H-bridge (CHB) converter. Each phase of the converter is provided with n Cascaded H-bridge rectifier circuits, or may also be provided with n Cascaded H-bridge rectifier circuits+1 redundant H-bridge rectifier circuit. The method includes following steps of: S1, generating groups of sinusoidal signals as reference waveforms, and generating n carrier signals having sequentially decreasing levels and equal amplitudes to correspond to the H-bridge rectifier circuit at the first to the nlevels, where the levels of the n carrier signals are cascaded to fill the voltage amplitude of a unipolar half cycle of the reference waveform; and S2, determining PWM signals for controlling power transistors of the corresponding H-bridge rectifier circuits based on each reference waveform and each carrier signal. According to the present invention, the CHB converter allows the MV grid to be directly coupled with a LV side without a conventional transformer, which reduces the heat loss and balances the distribution of heat loss between the power transistors and between the H-bridges at all levels, thus prolonging the service life.