Corona treatment machine power supply wrong phase, lack of phase protection circuit

Abstract

The invention discloses a power supply source fault-phase and default-phase protective circuit of a corona processor. The circuit comprises sampling signals of a three-phase power source, a four-operational-amplifier integrated circuit, a phase inverter, a forward logic NAND gate, a trigger, a default-phase fault indicating lamp and a fault-phase indicating lamp, wherein the sampling signals of the three-phase power source are respectively fed into a potentiometer, the four-operational-amplifier integrated circuit receives the sampling signals, transmitted by the potentiometer, of the three-phase power source and generates square signals of the three-phase power source after the sampling signals are compared with a reference voltage, the phase inverter is used for outputting the square signals in a reverse-phase mode, the forward logic NAND gate receives the square signals which pass through a rectification filtering circuit, are output in the reverse-phase mode, and are used for default-phase detection, the trigger receives two-phase signals which are in the reverse phase by the phase inverter, the two-phase signals are used for judging the phase position of the A-phase signal and the phase position of the B-phase signal, the default-phase fault indicating lamp is used for indicating that the default phase appears on the three-phase power source, and the fault-phase indicating lamp is used for indicating that the phase positions of the three-phase power source are not arranged in sequence. According to the circuit, the default-phase and fault-phase protection functions are achieved, and the fault, caused by the default phase and the fault phase, of the three-phase rectification power source circuit of the corona processor is avoided.

Description

technical field [0001] The invention relates to a phase-wrong and lack-of-phase protection circuit for a power supply of a corona treatment machine. Background technique [0002] The corona processor is powered by a three-phase power supply, and the output power of the machine is adjusted by changing the DC voltage through three-phase controllable rectification. Since the original corona processor does not have a phase-loss or phase-wrong protection circuit, when the power supply fails When the phase or phase is wrong, the trigger pulse of the controlled rectifier circuit is prone to timing disorder, which leads to breakdown of the thyristor rectifier bridge and machine failure. Therefore, it is necessary to provide a new technical solution to solve the above technical problems. Contents of the invention [0003] In order to solve the above problems, the present invention provides a high-accuracy and stable corona treatment machine power supply wrong-phase, phase-loss pro...

AI Technical Summary

Problems solved by technology

[0002] The corona processor is powered by a three-phase power supply, and the output power of the machine is adjusted by changing the DC voltage through three-phase controllable rectification. Since the original corona processor does not have a phase-loss or phase-wrong protection circuit, when the power supply fails When the phase or phase is wrong, the trigger pulse of the controlled rectifier circuit is prone to timing disorder, which leads to breakdown of the thyristor rectifier bridge and machine failure

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