Full digital electromagnetic heater
An electromagnetic heater, fully digital technology, applied in induction heating, induction heating control and other directions, can solve the problems of poor automatic adjustment ability, poor anti-interference ability, imperfect constant power protection control, etc., to achieve automatic frequency sweep, improve The effect of power factor
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[0027] Implementation mode of overcurrent protection: the current detection unit 1 samples the working current of the inductive load L through the sampling resistor R, the short-circuit overcurrent protection circuit in the current detection unit 1 generates a pulse blocking signal when the sampling current reaches the threshold, and the main control unit 2 When the pulse blocking signal is received, the pulse generation unit 3 is controlled to stop generating pulses, and the alarm indication unit 6 is controlled to generate a corresponding alarm indication.
[0028] Implementation mode of overvoltage protection: When the mains voltage input by the power supply is higher than 200V, the voltage across the IGBT Q increases compared with normal conditions, and correspondingly, the bus voltage detected by the voltage detection unit increases, and the sampling The voltage is sent to the main control unit 2, and the main control unit 2 judges and analyzes the voltage value of the sam...
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