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switch protection circuit

A technology for protecting circuits and shutting down circuits, which is applied to emergency protection circuit devices, electronic switches, electrical components, etc., and can solve problems such as long power supply fault diagnosis time, and achieve the effect of avoiding damage

Active Publication Date: 2019-11-22
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a switch protection circuit to solve the problem that the existing low-side switch output end is short-circuited and the power supply fault diagnosis time is too long

Method used

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Embodiment Construction

[0038]The switch protection circuit proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0039] The core idea of ​​the present invention is to provide a switch protection circuit to solve the problem of too long diagnosis time from the short circuit of the output end of the existing low-side switch to the power failure.

[0040] In order to realize the above ideas, the present invention provides a switch protection circuit, the switch protection circuit includes a fast turn-off circuit and a controllable switch, wherein: the fast turn-off circuit includes a fir...

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Abstract

The invention provides a switch protection circuit, and the circuit comprises a quick switching-off circuit and a controllable. The quick switching-off circuit comprises a first diode, a second diode,a third resistor, a fourth resistor, and a second capacitor. The anode of the first diode is connected with the anode of the second diode and the first end of the fourth resistor. The second end of the second resistor is connected with the output end of a low-side switch, and the cathode of the first diode is coupled to the input end of the low-side switch. The cathode of the second diode is connected with the input end of a controllable switch. The output end of the controllable switch is connected with the input end of the low-side switch. One end of the third resistor is connected with thecathode of the second diode, and the other end of the third resistor is grounded. One end of the second capacitor is connected with the first end of the fourth resistor, and the other end of the second capacitor is grounded.

Description

technical field [0001] The invention relates to the technical field of analog electronics, in particular to a switch protection circuit. Background technique [0002] Figure 1~2 They are schematic diagrams of switch type and PWM type low-side drive circuits respectively, both of which are mainly composed of two parts: low-side drive circuit and diagnostic circuit. The low-side drive circuit is that when the switching signal or PWM signal S1 output by the main controller is at a high level and supplied to the input terminal 11 of the switch K1, the load terminal 12 of the switch K1 is conducted to the ground, and one terminal of the load 10 is connected to the power supply Vbat. The other end 13 is grounded, so the load 10 is supplied with power. When S1 is at a low level, the K1 load end 12 of the switch is disconnected from GND. During the process of switching K1 from on to off, for figure 1 In the switch-type low-side circuit shown, if the load 10 is an inductive load, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/22H03K17/081
CPCH02H7/222H03K17/081
Inventor 吴宏达黄腾云刘斌彬吴建宏何月青李磊
Owner UNITED AUTOMOTIVE ELECTRONICS SYST