Title:
SIGNAL ZERO-CROSSING DETECTION CIRCUIT AND SWITCHING POWER SUPPLY
Document Type and Number:
WIPO Patent Application WO/2024/131485
Kind Code:
A1
Abstract:
A signal zero-crossing detection circuit and a switching power supply. The signal zero-crossing detection circuit comprises a signal sampling circuit and a zero-crossing identification circuit. During the operation of the signal zero-crossing detection circuit, when an alternating-current signal is at a positive half-wave, the signal sampling circuit converts the alternating-current signal into a voltage of a first set voltage plus an amplitude voltage and then outputs same to the zero-crossing identification circuit, and the zero-crossing identification circuit performs identification and determination and then outputs a low level; when the alternating-current signal is at a negative half-wave, the signal sampling circuit converts the alternating-current signal into a voltage of the first set voltage minus the amplitude voltage and then outputs same to the zero-crossing identification circuit, and the zero-crossing identification circuit performs identification and determination and then outputs a low level; and when the alternating-current signal is at zero, the signal sampling circuit converts the alternating-current signal into the first set voltage and then outputs same to the zero-crossing identification circuit, and the zero-crossing identification circuit performs identification and determination and then outputs a high level.
Inventors:
DENG, Wangang (Nanyun 4th Road Huangpu District, Guangzhou Guangdong 3, CN)
ZHANG, Qingsong (Nanyun 4th Road Huangpu District, Guangzhou Guangdong 3, CN)
CHENG, Zhiyong (Nanyun 4th Road Huangpu District, Guangzhou Guangdong 3, CN)
ZHANG, Qingsong (Nanyun 4th Road Huangpu District, Guangzhou Guangdong 3, CN)
CHENG, Zhiyong (Nanyun 4th Road Huangpu District, Guangzhou Guangdong 3, CN)
Application Number:
PCT/CN2023/134752
Publication Date:
June 27, 2024
Filing Date:
November 28, 2023
Export Citation:
Assignee:
MORNSUN GUANGZHOU SCIENCE TECHNOLOGY CO., LTD. (Nanyun 4th Road Huangpu District, Guangzhou Guangdong 3, CN)
International Classes:
G01R19/175; H02M1/00; H02M1/32; H02M7/04
Attorney, Agent or Firm:
SUNSHINE INTELLECTUAL PROPERTY INTERNATIONAL CO., LTD. (Tower A Zhongguancun Intellectual Property Building, No. 21, A, Haidian South Roa, Haidian District Beijing 0, CN)
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