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Title:
DRIVE CIRCUIT OF LIQUID CRYSTAL SHUTTER, LIQUID CRYSTAL SHUTTER, AND LED LAMP
Document Type and Number:
WIPO Patent Application WO/2021/203649
Kind Code:
A1
Abstract:
A drive circuit of a liquid crystal shutter, a liquid crystal shutter, and an LED lamp. The drive circuit comprises an LDO step-down circuit (110) and a full-bridge drive circuit (120). The LDO step-down circuit (110) comprises: a linear step-down circuit (111) comprising a linear step-down chip (U1), wherein an input end of the linear step-down chip (U1) is connected to a power supply (130); the linear step-down chip (U1) is used for performing linear step-down processing on a power supply voltage; a step-down regulation circuit (112) comprising at least one digital potentiometer, wherein a wiper (W) of the digital potentiometer is connected to a voltage regulation pin (ADJ) of the linear step-down chip (U1); the digital potentiometer is used for regulating a voltage output by a voltage output pin (Vout) of the linear step-down chip (U1); a step-down processing circuit (113) used for performing filtering and step-down processing on a voltage output by the linear step-down circuit (111); and an output feedback circuit (114) used for feeding back a voltage output by the LDO step-down circuit (110). The regulation accuracy of the drive circuit is improved, the noise and the ripple ratio are reduced, and the stability of the liquid crystal shutter is improved.

Inventors:
LIU YANG (CN)
XIE YI (CN)
ZHOU XIANGJUN (CN)
TONG KUN (CN)
Application Number:
PCT/CN2020/120150
Publication Date:
October 14, 2021
Filing Date:
October 10, 2020
Export Citation:
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Assignee:
APUTURE IMAGING IND CO LTD (CN)
International Classes:
G02F1/133; F21V14/00; F21Y115/10
Attorney, Agent or Firm:
PURPLEVINE INTELLECTUAL PROPERTY (SHENZHEN) CO., LTD. (CN)
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