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Variable threshold overvoltage protection circuit, electronic device and method

A technology of overvoltage protection circuit and variable gate, which is applied in the direction of safety/protection circuit, emergency protection circuit device, and protection reacting to overvoltage, etc., which can solve the problems such as deterioration of circuit protection effect and achieve the goal of improving protection effect Effect

Active Publication Date: 2022-07-12
SHANGHAI WINGTECH INFORMATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the QC3.0 scheme, the input voltage varies between 5V and 9V. Since the existing OVP only has a fixed reference voltage of 1.2V, the start-up threshold can only be set to a voltage value higher than 9V. (such as 10.8V), in order to protect the subsequent circuit, but if the start-up threshold is set too high, it will lead to poor protection effect on the subsequent circuit

Method used

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  • Variable threshold overvoltage protection circuit, electronic device and method
  • Variable threshold overvoltage protection circuit, electronic device and method
  • Variable threshold overvoltage protection circuit, electronic device and method

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Embodiment Construction

[0022] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Thus, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

[0023] In one embodiment,...

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Abstract

The invention provides a variable threshold overvoltage protection circuit, electronic equipment and method. The variable threshold OVP chip in the variable threshold overvoltage protection circuit includes a voltage input pin, a startup threshold pin, a voltage output pin, an AC voltage signal detection pin, a clock signal input pin and a data signal input pin; The clock signal input pin is used to connect the clock signal line to obtain the clock signal; the data signal input pin is used to connect the data line and obtain the data signal; the variable threshold OVP chip passes the clock according to the input voltage input by the voltage input pin signal and data signal, and obtain the corresponding target threshold value, so that the target threshold value can be adapted to the input voltage and improve the protection effect of the subsequent circuit.

Description

【Technical field】 [0001] The invention relates to the technical field of overvoltage protection, in particular to a variable threshold overvoltage protection circuit, electronic equipment and method. 【Background technique】 [0002] In order to ensure the safety of the mobile phone during the charging process, an OVP (overvoltage protection) chip is usually added to the charging input to protect the subsequent circuit. When the OVP chip detects that the input voltage is higher than the set startup threshold, the OVP chip will Immediately turn off the charging circuit, prevent the voltage output, and protect the subsequent circuit. In the existing OVP chip, the start-up threshold is calculated by the pull-up and pull-down resistors, which cannot be changed after setting, and is only suitable for traditional fixed-voltage charging (such as 5V / 2A charging). [0003] After the rise of the fast charging scheme, the charging voltage is constantly adjusted during the charging proce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/20H02H7/20H02J7/00
CPCH02H3/20H02H3/006H02H7/20H02J7/0031Y02E60/10
Inventor 王瑞丰
Owner SHANGHAI WINGTECH INFORMATION TECH CO LTD