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Alternating current fault detection circuit and detection method thereof

A fault detection circuit and fault control technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of difficulty in implementation, high cost, loss, etc., and achieve the effect of reliable fault detection and judgment and rapid processing.

Active Publication Date: 2017-08-04
SUZHOU LII SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] AC power supply is used in all walks of life, including industrial production, household power supply, etc. AC power supply will cause power failure due to various reasons. When a power failure occurs, if it is not detected and dealt with in time, it will sometimes cause a fire. , damage to electrical equipment, threats to personal safety and other unpredictable disasters
At present, people are still seeking stable control of AC power supply. The fault detection of AC power supply is either complicated in structure, high in cost, and difficult to realize, or the detection circuit itself consumes a lot of power, causing more damage during normal operation. loss
Among them, the most commonly used is to install fuses such as fuses before the AC power enters the electrical equipment, but these are passive protection measures that treat the symptoms but not the root cause.

Method used

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  • Alternating current fault detection circuit and detection method thereof
  • Alternating current fault detection circuit and detection method thereof
  • Alternating current fault detection circuit and detection method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] See figure 1 and figure 2 On the basis of the above technology, the first fault detection circuit includes a first voltage stabilizing circuit and a first timing control circuit 1, the first voltage stabilizing circuit supplies power to the first timing control circuit 1, and the first voltage stabilizing circuit is used to make the transmission to the first timing control circuit 1 The first voltage of the timing control circuit 1 is a stable voltage with a duty cycle of 50% corresponding to the frequency of the tested AC signal. When the first voltage is a fault voltage, the first fault control signal is input relative to the first anode The AC signal at terminal 5 or the first cathode input terminal 7 is a high-level signal; the second fault detection circuit includes a second voltage stabilizing circuit and a second timing control circuit 2, and the second voltage stabilizing circuit supplies the second timing control circuit with 2 power supply, the second voltag...

Embodiment 2

[0045] Such as image 3 and Figure 4 shown in figure 1 or figure 2 Based on the technical basis, the first fault detection circuit also includes a third N-type MOS transistor Q3 and a fourth depletion-type MOS transistor Q4, and the fourth depletion-type MOS transistor Q4 is a depletion-type MOS transistor with a third diode tube or the fourth depletion-type MOS transistor Q4 is externally connected with a third diode, the cathode of the third diode and the drain of the fourth depletion-type MOS transistor Q4 are both connected to the first cathode input terminal 7, and the third N-type The gate of the MOS transistor Q3 is connected to the first fault control signal output terminal 3 of the first timing control circuit 1, the drain of the third N-type MOS transistor Q3 is connected to the source of the fourth depletion-type MOS transistor Q4, and the third The source of the N-type MOS transistor Q3, the gate of the fourth depletion-type MOS transistor Q4 and the anode of ...

Embodiment 3

[0052] A method for detecting an AC fault, wherein an AC fault detection circuit is provided to connect an AC signal input, a fault control signal output, and a fault processing circuit, further comprising the following steps:

[0053] Step 1, setting a first fault detection circuit and a second fault detection circuit in the AC fault detection circuit, the structure of the first fault detection circuit and the structure of the second fault detection circuit are symmetrically set to be the same;

[0054] Step 2: Set the two ends of the first fault detection circuit as the first anode input end 5, the first cathode input end 7 and the first fault control signal output end 3 respectively, and set the first fault control signal output end 3 to output the first Fault control signal; symmetrically set the two ends of the second fault detection as the second anode input terminal 6, the second cathode input terminal 8 and the second fault control signal output terminal 4, and set the ...

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PUM

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Abstract

The invention provides an alternating current fault detection circuit provided and connected with alternating current signal input, and the circuit includes a first fault detection circuit and a second fault detection circuit which are symmetrically the same in structure; the first fault detection circuit includes a first anode input end, a first cathode input end and a first fault control signal output end, the first fault control signal output end outputs a first fault control signal, symmetrically, the second detection fault detection circuit includes a second anode input end, a second cathode input end and a second fault control signal output end, and the second fault control signal output end outputs a second fault control signal. The alternating current fault detection circuit realizes accurate and reliable fault detection judgment of an alternating current circuit, and rapidly outputs alternating current fault control signals.

Description

technical field [0001] The invention relates to the field of electrical circuits, in particular to an AC fault detection circuit and a detection method thereof. Background technique [0002] AC power supply is used in all walks of life, including industrial production, household power supply, etc. AC power supply will cause power failure due to various reasons. When a power failure occurs, if it is not detected and dealt with in time, it will sometimes cause a fire. , Damage to electrical equipment, threats to personal safety and other unpredictable disasters. At present, people are still seeking stable control of AC power supply. The fault detection of AC power supply is either complicated in structure, high in cost, and difficult to realize, or the detection circuit itself consumes a lot of power, causing more damage during normal operation. loss. Among them, the most used is to install fusing devices such as fuses before the AC power enters the electrical equipment, but...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02
CPCG01R31/50Y04S10/52
Inventor 林新春郑凌波罗小荣
Owner SUZHOU LII SEMICON CO LTD
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