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A self-recovery protection circuit and device

A protection circuit and self-recovery technology, which is applied in the electronic field, can solve problems such as high cost, inconvenient construction, and great difficulty, and achieve the effects of fast response to overcurrent, improved safety and stability, and guaranteed safety

Active Publication Date: 2021-08-17
宜宾听点科技有限公司
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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 overcome the deficiencies in the self-recovery protection circuit in the prior art, realize the overcurrent detection that has been restored before the self-recovery power supply, improve the safety and stability of the entire circuit system, and solve the problem of using digital circuits to design protection circuits The problems of inconvenient construction, high cost and great difficulty brought about by

Method used

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  • A self-recovery protection circuit and device
  • A self-recovery protection circuit and device
  • A self-recovery protection circuit and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] In an exemplary embodiment, such as figure 1 As shown, a self-recovery protection circuit is provided, including:

[0059] The power supply circuit provides power to the load; the power supply control circuit is used to control the on-off of the power supply circuit; the self-recovery control circuit is used to detect the signal of the power supply circuit and control the on-off self-recovery of the power supply control circuit, and the self-recovery control circuit include:

[0060] The current sampling circuit is used to collect the power supply current of the power supply circuit, and simultaneously convert the collected power supply current into a voltage, and output the voltage V0 of the equivalent power supply current to the first comparator;

[0061] The first comparator circuit is used to receive the voltage V0 of the equivalent power supply current and determine whether the power supply circuit is in an overcurrent state. When the power supply circuit is in an...

Embodiment 2

[0069] On the basis of Embodiment 1, a self-recovery protection circuit is provided, such as figure 2 As shown, the first comparator circuit includes:

[0070] a first comparator, configured to determine the magnitude of the voltage V0 of the equivalent supply current and the first reference voltage Vref1, and output a first comparison signal V1;

[0071] A self-locking circuit, configured to lock the output of the first comparator to a high level when the voltage V0 is greater than the first reference voltage Vref1;

[0072] The reset control self-recovery circuit includes sequentially connected:

[0073] The first charging and discharging circuit includes a first capacitor C1, and the first capacitor C1 is charged and discharged according to the level state of the first comparison signal V1;

[0074] The second comparator circuit includes a second comparator, and the second comparator outputs a second comparison signal V2 according to the magnitude of the voltage Vc1 of t...

Embodiment 3

[0079]Based on Embodiment 2, this embodiment provides a specific structural diagram of the self-recovery control circuit. The second charging and discharging circuit adopts the first parallel capacitor structure, and the technical solution of the present invention is described in conjunction with the specific structures of other parts of the circuit.

[0080] Specifically, such as image 3 As shown, the dotted box 1 represents the current sampling circuit, and the current sampling circuit can use Hall sensors or sampling resistors to sample the current of the power supply circuit.

[0081] The dotted box 2 represents the first comparator circuit, wherein the self-locking circuit includes an eighth resistor R8, and the eighth resistor R8 is connected between the positive input terminal and the output terminal of the first comparator. The negative input terminal of the first comparator COMP1 inputs the first reference voltage Vref1, the power supply pin of the first comparator C...

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Abstract

The invention discloses a self-recovery protection circuit and device, which belong to the field of electronic technology, wherein the self-recovery control circuit is used to detect the signal of the power supply circuit and control the on-off self-recovery of the power supply control circuit, including a current sampling circuit and a first comparator Circuit and reset control self-recovery circuit, when the power supply circuit is in an overcurrent state, the first comparator circuit outputs an overcurrent signal and performs level self-locking, immediately controls the power supply control circuit to disconnect, and performs overcurrent protection; then the first comparator circuit The delay controls the first comparator circuit to enter reset and exit level self-locking, then the reset control self-recovery circuit controls the first comparator circuit to exit the reset state with the second delay, and the reset control self-recovery circuit slowly opens with the third delay The power supply control circuit realizes self-recovery power supply. In addition, the circuit ensures that the circuit has resumed circuit detection before the power supply is restored by adjusting component parameters, thereby improving the safety and stability of the entire circuit system.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a self-restoring protection circuit and device. Background technique [0002] In many low-voltage power supply applications, the circuit is required to have the function of over-current protection or short-circuit protection when the load fails, and in order to ensure that the power supply can be restored in time when the load fault ends, the protection circuit is required to have self-recovery characteristics. The traditional method is The current-limiting resistor may adopt the method of self-recovery fuse, but in the case of a slightly larger power, the current-limiting resistor generates serious heat and is easy to burn out, resulting in sparks, while the self-recovery fuse is more used for current limiting, resulting in large heat loss. Due to the slow response during short circuit, it is easy to cause high current to cause damage to the device and cannot be recovered. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/093H02H3/06
CPCH02H3/066H02H3/093
Inventor 徐远灿陈万垒
Owner 宜宾听点科技有限公司
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