Signal Transformation Isolation Control Circuit for High Frequency Induction Heating Device
A technology of high-frequency induction heating and signal conversion, which is applied in general control system, program control, electrical program control, etc., can solve the problems of power module alarm and false signal, equipment cannot start and run normally, and malfunction, so as to avoid interference factors , to ensure reliable control and normal operation
Active Publication Date: 2018-11-23
SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE
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Problems solved by technology
Because the high-frequency induction heating device is in harsh working conditions such as high ambient temperature, its control system is prone to aging, and the power module is relatively faster and more obvious, resulting in an increase in the failure rate of the control system
Because the overall cost of high-frequency induction heating device transformation is relatively high, the power module is generally replaced in advance. After the transformation, the upgraded power module and the alarm signal port and control module of the original PLC controller allow the working port of the power module to easily generate interference signals. Therefore, , often causes the power module to malfunction when the system does not have the working conditions, resulting in equipment failure, or when the equipment is not working, the power module generates an alarm error signal, causing the equipment to fail to start and run normally
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[0008] Such as figure 1 As shown, the signal conversion isolation control circuit used in the high-frequency induction heating device of the present invention includes a PLC controller 1, a control module 2 and a power module 3, and the PLC controller 1 is provided with a control port 11 that allows the power module signal to alarm and a power supply Module alarm signal port 12, the control module 2 is provided with a power supply module work control port 21 and a power supply module alarm signal port 22, the power supply module 3 is provided with a work control port 31 and a three-way alarm signal port 32, the circuit It also includes a first photocoupler T1, a second photocoupler T2, a third photocoupler T3, a fourth photocoupler T4, a fifth photocoupler T5, a first resistor R1, a second resistor R2, a third resistor R3, fourth resistor R4, fifth resistor R5 and Zener diode D, the diode anode of the first photocoupler T1 is connected to the positive pole of the external powe...
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The invention discloses a signal conversion isolation control circuit for a high-frequency induction heating device. The circuit adopts five photoelectric couplers and corresponding resistors, and a voltage stabilizing diode, which are respectively connected with control ports of a PLC controller, a control module and a power module, wherein the first photoelectric coupler is the working condition of the third and fourth photoelectric couplers, the third, fourth and fifth photoelectric couplers convert and isolate working signals, and the second photoelectric coupler is a amplitude-limiting signal conversion isolator and is used for starting the power module to work. The circuit is connected with the PLC controller, the control module and the power module, achieves a signal matching and conversion isolation control effect, avoids interference factors of a production site, and ensures reliable control on and normal operation of the high-frequency induction heating device.
Description
technical field [0001] The invention relates to a signal conversion isolation control circuit for a high-frequency induction heating device. Background technique [0002] The high-frequency induction heating device is a special equipment for the heat treatment of the strip steel surface. Its control system is controlled by the control module. The power supply module provides working power for the high-frequency induction heating device. According to the process requirements of heat treatment, the control module is controlled by the PLC controller. Because the high-frequency induction heating device is in harsh working conditions such as high ambient temperature, its control system is prone to aging, and the power module is relatively faster and more obvious, resulting in an increase in the failure rate of the control system. Because the overall cost of high-frequency induction heating device transformation is relatively high, the power module is generally replaced in advance...
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IPC IPC(8): G05B19/05
CPCG05B19/05G05B2219/15078
Inventor 张宇敏杨天峰沈嘉麟钱存坚
Owner SHANGHAI BAOSTEEL IND TECHNOLOGICAL SERVICE