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A program-controlled overcurrent protection circuit and its implementation method

An overcurrent protection circuit, overcurrent protection technology, applied in emergency protection circuit devices, protections that respond to overcurrent, circuit devices, etc., to achieve the effects of improving flexibility, high program control consistency, and improving accuracy

Active Publication Date: 2018-10-19
THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the needs of automatic testing and high-precision program control, the existing over-current protection circuit has been unable to meet, so a reliable, simple and effective high-precision program-controlled over-current protection circuit and its implementation method are needed to solve the above problems

Method used

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  • A program-controlled overcurrent protection circuit and its implementation method
  • A program-controlled overcurrent protection circuit and its implementation method
  • A program-controlled overcurrent protection circuit and its implementation method

Examples

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Embodiment Construction

[0038] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0039] Such as figure 1 The program-controlled overcurrent protection circuit shown includes a current detection operation circuit 1, an overcurrent programming operation circuit 2, a level comparison conversion circuit 3, a protection duration control circuit 4, a threshold setting control circuit 5, a protection trigger clearing circuit 6 and Protection shutdown reset circuit 7;

[0040] The current detection operation circuit 1 is configured to perform I-V conversion on the weak current detection signal and convert it into a voltage signal;

[0041] The overcurrent programming operation circuit 2 is configured to compare and operate the voltage signal and the overcurrent programming signal to obtain an overcurrent protection analog signal;

[0042] The level comparison conversion circuit 3 is configured to convert the over-current protectio...

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Abstract

The invention discloses a program-controlled over-current protection circuit and a realization method thereof, and belongs to the field of test. A differential operational amplifier is used as the input stage, which improves the accuracy of over-current protection and avoids influence such as noise. A protection length control circuit is adopted, and the over-current protection signal rising time and the protection state locking time are designed reasonably, so false protection triggering caused by instant current overshoot is eliminated effectively, and the phenomenon of protection dithering is avoided. A protection trigger clear circuit is used to make the protection state program-controlled. A protection shutoff reset circuit is used to quickly shut off a power circuit.

Description

technical field [0001] The invention belongs to the technical field of testing, and in particular relates to a program-controlled overcurrent protection circuit and a realization method. Background technique [0002] Existing overcurrent protection circuits generally use resistors for current sampling, that is, through special precision sampling resistors, the current signal is converted into a voltage sampling signal, and then the voltage sampling signal is compared with the reference voltage of the current protection point to generate overcurrent protection. signal to control and turn off the PWM output, so as to achieve the over-current protection function. At present, there are common problems such as low precision of protection points, false triggering and difficulty in program control. In the program-controlled power supply, especially when the program-controlled DC power supply provides excitation, there are various back-end loads, including inductive loads and capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08H02H3/06
CPCH02H3/066H02H3/08
Inventor 王文廷李斌王俊王群栗永强汪定华吕士如
Owner THE 41ST INST OF CHINA ELECTRONICS TECH GRP
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