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Display device and control circuit

A display device and control circuit technology, applied in the electronic field, can solve the problems of increasing synchronous rectification MOSFET loss, synchronous rectification MOSFET heating, affecting the voltage value of SR drive chip, etc.

Active Publication Date: 2021-05-11
HISENSE VISUAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, due to the parasitic inductance on the pin of the synchronous rectification MOSFET of the rectification circuit, it affects the voltage value collected by the SR driver chip, thus affecting the processor's control of the synchronous rectification MOSFET The timing of turn-on and turn-off leads to a serious phenomenon of overall heating of the synchronous rectification MOSFET, which increases the loss of the synchronous rectification MOSFET

Method used

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  • Display device and control circuit
  • Display device and control circuit
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Embodiment Construction

[0062]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 some, not all, embodiments of the present invention. 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.

[0063] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the present invention and the above drawings are used to distinguish similar objects, and not necessarily Used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of practice in sequences...

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Abstract

The present invention provides a display device and a control circuit. A switch tube connected in parallel with the synchronous rectification MOSFET of the rectification circuit is added in the control circuit, and the pin parasitic inductance of the switch tube is relatively small, so that the voltage at the two sides of the switch tube can more accurately reflect the voltage generated by the current actually flowing through the synchronous rectification MOSFET, and therefore, the controller can determine the voltage generated by the current flowing through the synchronous rectification MOSFET by detecting the voltage on the two sides of the switching tube, so that the influence of parasitic inductance on the pin of the synchronous rectification MOSFET on the voltage on the two sides of the MOSFET can be counteracted when the voltage on the two sides of the synchronous rectification MOSFET is directly detected.

Description

[0001] This application claims the priority of the Chinese patent application with the application number 201911067970.2 and the application name "Control Method and Circuit of Synchronous Rectification MOSFET" submitted to the China Patent Office on November 04, 2019, the entire contents of which are incorporated by reference in this application middle. technical field [0002] The present application relates to electronic technology, in particular to a display device and a control circuit. Background technique [0003] The rectifier circuit in the display device is a circuit used to convert alternating current into direct current. In some application scenarios, it is necessary to collect the voltage value on both sides of the synchronous rectification MOSFET in the rectifier circuit, and use the voltage value as a trigger to judge the function of the display device in accordance with. For example, a synchronous rectification (synchronous rectification, SR for short) drive...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335G09G3/00G09G3/20
CPCH02M3/33523H02M3/33592G09G3/001G09G3/20
Inventor 庞震华
Owner HISENSE VISUAL TECH CO LTD