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MOS tube protection circuit

A MOS tube and protection circuit technology, which is applied in the field of MOS tube protection circuit, can solve the problems of MOS tube being easily damaged due to overcurrent

Pending Publication Date: 2020-12-18
UBTECH ROBOTICS CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of this application is to provide a protection circuit for MOS tubes, which aims to solve the problem that MOS tubes are easily damaged by overcurrent

Method used

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Embodiment Construction

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.

[0024] It should be noted that when an element is referred to as being “fixed” or “disposed on” another element, it may be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0025] It is to be understood that the terms "length", "width", "top", "bottom", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and oth...

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Abstract

The invention relates to the field of overcurrent protection, and provides an MOS transistor protection circuit, which comprises a sampling amplification circuit connected with an MOS transistor and used for sampling and amplifying the current of the MOS transistor and outputting a current sampling voltage; a comparison circuit connected with the sampling amplification circuit and used for comparing the current sampling voltage with a reference voltage and outputting a control signal according to a comparison result; and the latch circuit is connected between the comparison circuit and a driving chip of the MOS transistor, and the latch circuit is used for controlling the driving chip to drive the MOS transistor to be on and off based on the control signal and the PWM signal so as to control the current of the MOS transistor to be below a certain threshold value. The current of the MOS tube is sampled and amplified, the sampled voltage is compared with the reference voltage, the PWM signal for driving the MOS tube is latched or released according to the comparison result, the current of the MOS tube is controlled to be below a certain threshold value, the overcurrent protection ofthe MOS tube is realized, the service life of the MOS tube is prolonged, and the circuit safety is improved.

Description

technical field [0001] The application belongs to the field of electronic circuits, and in particular relates to a protection circuit for a MOS transistor. Background technique [0002] With the development of technology, the emergence of a driving integrated circuit (Integrated circuit, IC) facilitates the driving control of a field effect transistor (MOS transistor). There are two types of driver ICs for MOS transistors on the market, one with a built-in current protection function and the other without a current protection function. In practical applications, when a drive IC without current protection function is used to drive a MOS tube, the drive IC cannot protect the MOS tube when the control algorithm is out of control or the device fails. When the current of the MOS tube exceeds its limit value, it will damage, resulting in product failure. Contents of the invention [0003] The purpose of the present application is to provide a protection circuit for a MOS trans...

Claims

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Application Information

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IPC IPC(8): H03K17/082
CPCH03K17/0822
Inventor 曾勇平范文华周升
Owner UBTECH ROBOTICS CORP LTD
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