Title:
DIRECT CURRENT VOLTAGE CONVERSION CIRCUIT AND LIQUID CRYSTAL DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/015182
Kind Code:
A1
Abstract:
Provided are a direct current voltage conversion circuit and a liquid crystal display device. The direct current voltage conversion circuit comprises a voltage-dividing unit (100), a voltage conversion unit (200), a first subtractor (310), an adder (320), a second subtractor (330), and a pulse width modulation unit (400). If a voltage outputted from an output end of the second subtractor (330) is less than or greater than a preset voltage difference value, the pulse width modulation unit (400) correspondingly adjusts a duty cycle of a pulse signal outputted therefrom, such that the outputted voltage and a feedback voltage increase or decrease until the voltage outputted from the output end of the second subtractor (330) is equal to the preset voltage difference value. Accordingly, an outputted voltage of the direct current voltage conversion circuit is increased when a current outputted from the direct current voltage conversion circuit increases, and an outputted voltage of the direct current voltage conversion circuit is decreased when a current outputted from the direct current voltage conversion circuit decreases, thereby ensuring that an electric element connected to the direct current voltage conversion circuit receives a consistent voltage, and improving product quality.
Inventors:
ZHANG XIANMING (CN)
Application Number:
PCT/CN2017/110994
Publication Date:
January 24, 2019
Filing Date:
November 15, 2017
Export Citation:
Assignee:
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECH CO LTD (CN)
International Classes:
H02M3/156
Foreign References:
| CN204258633U | 2015-04-08 | |||
| CN102802062A | 2012-11-28 | |||
| CN102290989A | 2011-12-21 | |||
| CN201127003Y | 2008-10-01 | |||
| CN102195495A | 2011-09-21 | |||
| US6583610B2 | 2003-06-24 |
Attorney, Agent or Firm:
COMIPS INTELLECTUAL PROPERTY OFFICE (CN)
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