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High-side switching circuit

A high-side switch and circuit technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve problems such as low reliability of switch circuits

Active Publication Date: 2020-10-16
ZHENGZHOU SENPENG ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of this application is to provide a high-side switch circuit to solve the problem of low reliability of the existing switch circuit

Method used

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  • High-side switching circuit
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] High side switch circuit embodiment:

[0029] A high side switch circuit such as figure 1 As shown, it includes: the third switching tube Q3, the driving circuit of the third switching tube Q3, an ON terminal, an OFF terminal, a power supply terminal, an output terminal, a protection circuit and a self-locking circuit.

[0030] The third switch tube Q3 is a MOS tube Q3, which is arranged in series between the power supply terminal and the output terminal. The power supply terminal is used to connect to the power supply VBAT, and the output terminal is used to connect to the load. Specifically, the source S of the MOS transistor Q3 is connected to the power supply terminal. The drain D output of MOS transistor Q3 is connected to the output terminal; and the control terminal of MOS transistor Q3 is connected to the power supply terminal through resistor R5, resistor R5 and resistor R Q3 Form the first voltage dividing branch, the first voltage dividing branch is set betw...

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PUM

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Abstract

The invention relates to a high-side switching circuit, and belongs to the technical field of electronics and power supplies. The high-side switching circuit comprises: a third switching tube Q3 whichis serially arranged between a power supply end and an output end, wherein the control end of the third switching tube Q3 is connected with the power supply end; a driving circuit of the third switching tube Q3 which comprises a second switching tube Q2 in driving control connection with the third switching tube Q3 and a first switching tube Q1 in driving control connection with the second switching tube Q2; an ON end which is connected with the control end of the second switching tube Q2; an OFF end which is connected with the control end of the first switching tube Q1; and a protection circuit and a self-locking circuit, wherein one end of the protection circuit is connected with the output end, the other end of the protection circuit is connected with the second switch tube Q2 and is in drive control connection with one end of the third switch tube Q3, a divider resistor R8 and a thermistor RNTC with a negative temperature coefficient are arranged on the protection circuit in series, one end of the self-locking circuit is connected with voltage division points of the divider resistor R8 and the thermistor RNTC, and the other end of the self-locking circuit is connected with thecontrol end of the second switching tube Q2. According to the invention, overcurrent / overtemperature protection of the high-side switching circuit is reliably realized.

Description

technical field [0001] The invention relates to a high-side switch circuit, which belongs to the technical field of electronics and power supply. Background technique [0002] At present, the known high-side switch chips for vehicles can basically cover the control and protection of all loads with a current ≤ 10A. For loads with a current > 10A, the cost of high-side switch chips is high and less used; for currents > For loads above 20A, there is no corresponding high-side switch chip at present, and loads with a current exceeding 20A can only be controlled by relays, and fuses are used for short-circuit protection. As we all know, relays have shortcomings such as large size, heavy weight, short life, and poor reliability, and fuses also have shortcomings such as slow protection, inaccurate protection, and need to be replaced after burning out, etc. Equipment with high performance and accuracy requirements. [0003] Therefore, in order to solve the problem of high cu...

Claims

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Application Information

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IPC IPC(8): H02H3/087H02H5/04
CPCH02H3/087H02H5/041
Inventor 左成钢
Owner ZHENGZHOU SENPENG ELECTRONICS TECH