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Driver output overcurrent protection circuit and its protection method

An overcurrent protection circuit and driver technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as device damage, achieve the effects of ensuring normal operation, overcoming high current impact, and improving stability and reliability

Active Publication Date: 2018-10-02
ZHEJIANG KAIYAO LIGHTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the driver generates overcurrent to the load during the hot plugging process of the prior art, which causes irreversible device damage to small electrical components represented by LEDs, and provides a driver output overcurrent protection circuit and its protection method

Method used

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  • Driver output overcurrent protection circuit and its protection method
  • Driver output overcurrent protection circuit and its protection method
  • Driver output overcurrent protection circuit and its protection method

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A driver output overcurrent protection circuit (see attached Figures 2 to 4 ), overcome the prior art (see attached figure 1 ) technical defect, in this embodiment, a capacitor is connected between the positive output terminal of the driver and the negative output terminal of the driver, the positive output terminal of the driver is connected to the positive input terminal of the load through the switch S or the hot-swappable interface, and the negative input terminal of the load It is connected to the negative output terminal of the driver, and the negative output terminal of the driver is grounded, including a weak power supply, a strobe signal circuit, a detection signal circuit, a first strobe switch and a second strobe switch, the control terminal of the first strobe switch and the second strobe switch The control end switches of the two gates are respectively connected to the output terminals of the gate signal circuit, the first input terminal of the detection s...

Embodiment 2

[0035] This example (see attached Figure 5) is the same as Embodiment 1 in terms of basic idea and principle, similar in scope of application, and the difference is that: the gate signal circuit is a single-chip microcomputer, the weak current power supply is connected with the power supply end of the single-chip microcomputer through a voltage stabilizing chip, and the single-chip microcomputer is connected with the detection signal circuit respectively The first output terminal is connected to the second output terminal of the detection signal circuit, one output terminal of the single-chip microcomputer is connected to the gate of the field effect transistor Q1 through the resistor R1, the gate of the field effect transistor Q1 is grounded through the resistor R2, and the other output of the single-chip microcomputer terminal is connected to the gate of the field effect transistor Q2 through the resistor R6, and the gate of the field effect transistor Q2 is grounded through...

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PUM

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Abstract

The invention relates to an output overcurrent protection circuit of a driver and a protection method thereof, which solves the deficiencies of the prior art. The control end of the first gating switch and the second gating switch are respectively connected to the output end of the gating signal circuit, the first input end of the detection signal circuit is connected to the negative output end of the driver, and the detection signal circuit The second input end of the first gating switch is connected to the load, the output end of the detection signal circuit is connected to the input end of the gating signal circuit, the first end of the first gating switch is connected to the positive output end of the driver, and the output end of the first gating switch is connected to the positive output end of the driver. The second end is connected to the negative output end of the driver, the first end of the second gating switch is connected in series with the load, the second end of the second gating switch is connected to the negative output end of the driver, and the gating signal circuit is powered by a weak current Power supply.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, and in particular provides a driver output overcurrent protection circuit and a protection method for the problem of driver output overcurrent. Background technique [0002] Small electrical components represented by LEDs are greatly affected by overcurrent, especially LEDs, which are prone to irreversible device damage when receiving overcurrent impacts. In the prior art, the LED driver maintains a constant The no-load voltage, and the no-load voltage is generally greater than the output voltage under full load. Experiments show that under full-load and light-load conditions, when the driver input switch is turned on, no overcurrent will be generated at the driver output position (that is, at the LED load position) (the current exceeding the rated current of the LED load can be defined as overcurrent, overcurrent The current will cause irreversible damage to the LED load); afte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/34
CPCH02M1/34H02M1/344
Inventor 赵旭李胜村袁宗乾朱士海
Owner ZHEJIANG KAIYAO LIGHTING