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.
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Inventors:
LIU YANG (CN)
XIE YI (CN)
ZHOU XIANGJUN (CN)
TONG KUN (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:
Assignee:
APUTURE IMAGING IND CO LTD (CN)
International Classes:
G02F1/133; F21V14/00; F21Y115/10
Foreign References:
| CN111323948A | 2020-06-23 | |||
| CN108011528A | 2018-05-08 | |||
| CN2537041Y | 2003-02-19 | |||
| CN103021356A | 2013-04-03 | |||
| CN106125374A | 2016-11-16 | |||
| CN104734501A | 2015-06-24 | |||
| CN107147316A | 2017-09-08 | |||
| CN201017135Y | 2008-02-06 | |||
| CN206757238U | 2017-12-15 | |||
| CN207429157U | 2018-06-01 | |||
| US20050041020A1 | 2005-02-24 | |||
| KR102018352B1 | 2019-10-21 |
Attorney, Agent or Firm:
PURPLEVINE INTELLECTUAL PROPERTY (SHENZHEN) CO., LTD. (CN)
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