Circuit and method for detecting inductance breaking arc maintenance time by signal phase separation

Abstract

The invention discloses a circuit and method for detecting the maintenance time of inductance breaking arc by signal phase separation. The circuit includes a voltage signal processing circuit, a phase separation delay circuit, a comparison output circuit, an arc time test and display driving circuit and an arc connected in sequence. Time display circuit; the phase delay circuit includes a first phase delay circuit and a second phase delay circuit, the first phase delay circuit includes a capacitor C1, a first proportional resistance network and a second proportional resistance network; the second phase delay The circuit includes a capacitor C2, a third proportional resistance network and a fourth proportional resistance network; the method comprises the steps of: 1. detection circuit connection, 2. voltage signal processing, 3. detection of inductance breaking arc maintenance time. The invention has the advantages of simple circuit structure, reasonable design, convenient implementation, low cost, stable and reliable operation, fast and effective detection of inductance breaking arc maintenance time, wide application range, strong practicability, and good popularization and application value.

Description

technical field [0001] The invention belongs to the technical field of detecting the maintenance time of an inductance breaking arc, and in particular relates to a circuit and a method for detecting the maintenance time of an inductance breaking arc by using signal phase separation. Background technique [0002] The safety spark test device is the basic equipment for studying the intrinsically safe performance of circuits, and various ignition curves drawn according to the test results obtained on the device are the basis for designing intrinsically safe circuits. Use the safety spark test device to test the inductive circuit. The discharge time is the duration of the circuit current decaying from the steady state value before disconnection to zero when detonated. It depends on the material, structure, switching speed of the device electrode and the characteristics of the circuit transition process. And test gas concentration, temperature, pressure, etc. If it is possible t...

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Problems solved by technology

Using method ②, its working principle is simple and easy to apply, but due to many factors, there may be errors in the time interval between two open circuit sparks, which will cause deviations in counting

[0004] In order to solve the above problems, the Chinese patent application number 201611261074.6 discloses a circuit and method for detecting the time of inductive circuit breaking arc discharge. However, according to the breaking arc discharge characteristic curve of the small inductance inductive circuit, when the inductance is small, the breaking arc discharge voltage has been rising, and there is no obvious second sudden rise phenomenon, so for small For the breaking arc discharge of inductance, the patented circuit and method with application number 201611261074.6 cannot accurately detect the end time of the breaking arc discharge

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