High frequency power supply induction heating timing protection device and protection method thereof

Abstract

The invention discloses a high frequency power supply induction heating timing protection device and a protection method thereof. The timing protection device comprises a power supply anode input terminal P1 and a power supply cathode input terminal P2 which provide a power source for the timing protection circuit, a signal input terminal P3 and a signal output terminal P5 which are taken as the signal input end and the signal output end of the timing protection circuit and are connected at two sides respectively, and a timing protection circuit P4 which comprises an intermediate relay KA and a time relay SJ. The signal input terminal P3 is controlled by the intermediate relay KA and the time relay SJ which sets time, then the outputting is carried out through the signal output terminal P5, the set value of the time relay SJ is adjusted to control the time of energized delay off of a time relay normally closed contact and control the continuous heating time of a high frequency power supply. According to the timing protection device, through adding the timing protection device in a high frequency power supply induction heating circuit, the high frequency power supply can be timely disconnected, and the safety and reliability of equipment operation are improved.

Description

technical field [0001] The invention relates to the field of high-frequency power induction heating, in particular to a high-frequency power induction heating timing protection device and a protection method thereof. Background technique [0002] At present, industrial control equipment controlled by computer advanced programming language is very extensive. Its output is a programmable relay output module. The on-off of the output point of the output module is controlled by program instructions, and then the output relay controls the actuator. [0003] The high-frequency power supply induction heating uses the high-frequency power supply of the electron tube as the heating element. The start and stop of the high-frequency power supply is controlled by the application program programmed in the high-level computer language running on the industrial computer. The industrial computer uses an independent power supply. When the high-frequency power supply induction heating command ...

AI Technical Summary

Problems solved by technology

[0003] The high-frequency power supply induction heating uses the high-frequency power supply of the electron tube as the heating element. The start and stop of the high-frequency power supply is controlled by the application program programmed in the high-level computer language running on the industrial computer. The industrial computer uses an independent power supply. When the high-frequency power supply induction heating command is executed Finally, the relay of the programmable output module that controls the induction heating of the high-frequency power supply is energized. There is heating overtime disconnection protection, but when the industrial computer crashes after executing the start heating command, because the program cannot continue to run, the overtime disconnection protection in the program does not work at all, the stop heating command cannot be executed, and the output relay is due to the output bit The high-frequency power supply continues to be heated by induction without receiving a power-off signal; or when the contact of the output relay is stuck, no matter whether the program is running or not, the high-frequency power supply will continue to be heated by induction

[0004] The high-frequency power supply induction heating time control requires precision. Once the computer crashes or the output relay contacts are stuck after executing the start heating command, the high-frequency power supply will continue to induce heating, causing the heating product to be scrapped and the equipment damaged.

Images