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Self-recovery stop type protection circuit for low-voltage and high-power safety barrier

A technology for protecting circuits and power switching circuits, applied in the direction of protection against overcurrent, etc., can solve problems such as monitoring and monitoring systems that are not widely used, hidden safety hazards, etc., and achieve novel and reasonable design, small power loss, and large output power Effect

Active Publication Date: 2014-03-05
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to statistics, there are currently about 26,000 coal mines of various types in my country, including more than 3,000 large and medium-sized coal mines. The key problem is that monitoring and monitoring systems have not been widely used, and there are many potential safety hazards. An intrinsically safe switching power supply, equipment improvement is imminent

Method used

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  • Self-recovery stop type protection circuit for low-voltage and high-power safety barrier
  • Self-recovery stop type protection circuit for low-voltage and high-power safety barrier
  • Self-recovery stop type protection circuit for low-voltage and high-power safety barrier

Examples

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Effect test

Embodiment 1

[0034] like figure 1 As shown, the present invention is connected between the non-intrinsically safe input circuit 7 and the load 8, including the power switch circuit 5 connected between the non-intrinsically safe input circuit 7 and the load 8 and used to control the opening or closing of the circuit, and the power switch The circuit 5 is connected to the current detection circuit 6 for real-time detection of the current in the circuit, the overcurrent and short circuit judgment circuit 2 is connected to the current detection circuit 6 and used to determine whether there is an overcurrent or short circuit phenomenon, and the overcurrent and short circuit A shutdown pulse output circuit 3 connected to the judgment circuit 2 and used to output a shutdown pulse signal when an overcurrent or short circuit occurs, and a drive connected to the shutdown pulse output circuit 3 and used to control the power switch circuit 5 to be turned off or turned on Circuit 4, the input terminal ...

Embodiment 2

[0042] combine image 3 The difference between this embodiment and Embodiment 1 is that the emitter of the NPN transistor VT2 is grounded, the collector of the NPN transistor VT2 is connected to one end of the resistor R3, and the other end of the resistor R3 is the drive circuit 4 outputs. The rest of the circuit structure is the same as that of Embodiment 1.

Embodiment 3

[0044] combine Figure 4 The difference between this embodiment and Embodiment 1 is that the power switch circuit 5 includes a resistor R1 and an enhancement-mode PMOS transistor VT3, and one end of the resistor R1 and the source of the enhancement-mode PMOS transistor VT3 are both connected to the non-intrinsically safe input circuit. 7 is connected to the positive output end of the resistor R1, the other end of the resistor R1 is connected to the gate of the enhanced PMOS transistor VT3 and is connected to the output end of the drive circuit 4, and the drain of the enhanced PMOS transistor VT3 is a power switch circuit. The positive output terminal of 5 is connected to the positive terminal of load 8. The rest of the circuit structure is the same as that of Embodiment 1.

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Abstract

The invention discloses a self-recovery stop type protection circuit for a low-voltage and high-power safety barrier. The self-recovery stop type protection circuit comprises a power switching circuit which is connected between a non intrinsic safety input circuit and a load and used for controlling switch-on and switch-off of a circuit, a current detection circuit which is connected with the power switching circuit and used for detecting current in the circuit in real time, an overcurent and shortcircuit judgment circuit which is connected with the current detection circuit, a switch-off pulse output circuit which is connected with the overcurent and shortcircuit judgment circuit, and a driving circuit which is connected with the switch-off pulse output circuit, wherein the input end of the overcurent and shortcircuit judgment circuit is connected with a reference circuit; the reference circuit is connected with the non intrinsic safety input circuit; and the driving circuit comprises an oscillation circuit for making the power switching circuit automatically re-switch on after the power switching circuit is switched off. The self-recovery stop type protection circuit has a simple structure, low power loss, high output power, a wide application range and high popularization and application value; the normal transmission of high-power electric energy is not influenced; and a requirement for intrinsic safety output is met.

Description

technical field [0001] The invention relates to an electronic product, in particular to a self-recovery cut-off protection circuit of a low-voltage high-power safety barrier connected between a non-intrinsically safe output power supply in a safe environment or an electronic product and an intrinsically safe device in a dangerous environment . Background technique [0002] When a non-intrinsically safe circuit is connected to an intrinsically safe circuit working in dangerous environments such as coal mines and petrochemicals, the output voltage, current and other signals may be very large and exceed the intrinsic safety range. If it is directly connected to an intrinsically safe circuit , the resulting fault sparks may detonate flammable and explosive gases or mixtures in hazardous environments. Therefore, in order to make the non-intrinsically safe circuit safely used in the dangerous environment, it is necessary to introduce a high-power safety barrier between it and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08
Inventor 刘树林杨波王媛媛张兴平文美娟
Owner XIAN UNIV OF SCI & TECH
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