Driving circuit of liquid crystal light valve, liquid crystal light valve and LED lamp
A driving circuit and liquid crystal light valve technology, applied in semiconductor devices, optics, light sources, etc. of light-emitting elements, can solve the problems of low adjustment accuracy and low stability
Active Publication Date: 2020-06-23
APUTURE IMAGING IND CO LTD
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Problems solved by technology
[0004] The invention provides a driving circuit of a liquid crystal light valve, a liquid crystal light valve and an LED lamp, so as to improve the problems of low adjustment accuracy and low stability in the existing liquid crystal light valve driving circuit
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[0025] The technical solutions in the embodiments and / or examples of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention. Obviously, the embodiments and / or examples described below are only part of the implementation of the present invention. schemes and / or examples, rather than all implementations and / or examples. Based on the implementations and / or examples in the present invention, all other implementations and / or examples obtained by persons of ordinary skill in the art without creative work fall within the protection scope of the present invention.
[0026] Aiming at the problems of low adjustment accuracy and low stability in the existing liquid crystal light valve drive circuit, the present invention provides a liquid crystal light valve drive circuit, which solves the problems of adjustment accuracy and stability, and has a wide input voltage range and peripheral devices Less, simple str...
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The invention provides a driving circuit of a liquid crystal light valve, the liquid crystal light valve and an LED lamp. The driving circuit comprises an LDO step-down circuit and a full-bridge driving circuit, the LDO step-down circuit comprises a linear step-down circuit, wherein the linear step-down circuit comprises a linear step-down chip, the input end of the linear step-down chip is connected with a power supply, and the linear step-down chip is used for carrying out linear step-down processing on power supply voltage; a step-down regulation circuit which comprises at least one digitalpotentiometer, wherein a scribing arm pin of the digital potentiometer is connected with a voltage regulation pin of the linear step-down chip, and the digital potentiometer is used for regulating the voltage output by a voltage output pin of the linear step-down chip; a voltage reduction processing circuit which is used for carrying out filtering and voltage reduction processing on the voltage output by the linear voltage reduction circuit; and an output feedback circuit which is used for feeding back the voltage output by the LDO step-down circuit. The adjusting precision of the driving circuit is improved, the noise and the ripple ratio are reduced, and the stability of the liquid crystal light valve is improved.
Description
technical field [0001] The present application relates to the technical field of electronic circuits, in particular to a driving circuit of a liquid crystal light valve, a liquid crystal light valve and an LED lamp. Background technique [0002] Traditional liquid crystal light valve drivers are basically driven by unidirectional low-voltage PWM (Pulse Width Modulation, pulse width modulation). Ratio, but this adjustment method can only meet some specific low-voltage one-way application scenarios with low precision requirements, and cannot meet high-precision application scenarios. At the same time, the traditional liquid crystal light valve drive circuit is used to drive the liquid crystal light valve with high power, and an external drive circuit is required. When the power supply uses a switching circuit, this will bring large ripples and noises. Not only It will shorten the life of the liquid crystal light valve, increase the instability of the liquid crystal light valv...
Claims
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IPC IPC(8): G02F1/133F21V14/00F21Y115/10
CPCF21V14/003F21Y2115/10G02F1/13306
Inventor 刘阳谢奕周向军童鹍
Owner APUTURE IMAGING IND CO LTD