Power supply circuit and liquid crystal display

A liquid crystal display, power supply circuit technology, applied in the direction of conversion equipment without intermediate conversion to AC, etc., can solve problems affecting system stability, large output voltage fluctuations, etc.

Inactive Publication Date: 2017-05-31
SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these schemes, due to the fixed frequency, when the load fluctuates greatly, the load response will be too slow and the output voltage will fluctuate greatly, which will affect the system stability.

Method used

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  • Power supply circuit and liquid crystal display
  • Power supply circuit and liquid crystal display

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Embodiment Construction

[0021] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] In addition, the following descriptions of the various embodiments refer to the attached drawings to illustrate specific embodiments in which the present invention can be implemented. The directional terms mentioned in the present invention, for example, "upper", "lower", "front", "rear", "left", "right", "inner", "outer", "side", etc., only is to refer to the direction of the attached drawings. Therefore, the direction terms used are for ...

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Abstract

A power supply circuit includes first and second current sources, first and second switches, first and second comparators, a latch, a driver, first to the third resistors, a first capacitor, and first and second electric switches, wherein the grounding of the first current source is realized through the first switch and the first resistor, the first switch is controlled by a PWM signal, the grounding of the second current source is realized by the first capacitor, the first comparator is used to compare the voltage at the node between the first switch and the first resistor with the voltage of the first capacitor, the grounding of the second capacitor is also realized by the second switch, the second switch is controlled by a reverse PWM signal, the first comparator is connected with the driver through the latch to control the driver for PWM low level signal output, the second and third resistors are connected in series between a voltage output end and the grounding, the second comparator is used to compare the voltage at the node between the second and third resistors with a reference voltage, and the second comparator is connected the driver through the latch to control the driver for PWM high level signal output. The invention improves the system stability.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a power supply circuit and a liquid crystal display. Background technique [0002] With the development of science and technology, the requirements for electronic equipment are getting higher and higher. For example, the performance of electronic equipment is more reliable, the functions are increasing, the use is more convenient, and the volume is decreasing day by day. These make DC-DC (direct current to direct current) conversion Technology becomes more important. At present, most of the current DC-DC schemes are in the fixed frequency peak control mode. In these schemes, due to the fixed frequency, when the load fluctuates greatly, the load response will be too slow and the output voltage will fluctuate greatly, thus affecting the system stability. Contents of the invention [0003] The purpose of the present invention is to provide a power supply circuit to improve the ...

Claims

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Application Information

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IPC IPC(8): H02M3/07
CPCH02M3/07
Inventor 曹丹
Owner SHENZHEN CHINA STAR OPTOELECTRONICS TECH CO LTD
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