JPS58133295U - induction heating cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the general configuration of an induction heating cooker, Figure 2 is a waveform diagram of signals necessary for driving, and Figure 3 is a
FIG. 4 is a power supply circuit diagram of a conventional example. FIG. 4 is a power supply circuit diagram of an embodiment of the present invention. 3, 12. 13. 22... Rectifier circuit, 4
...Inverter, 5...Induction heating coil, 8...Control circuit, 9...Drive circuit, 10.10'...Power supply circuit. Figure 1 Figure 2

Claims (1)

[Scope of utility model registration request] An alternating current power source, a rectifier circuit, an inverter to which a pulsating voltage rectified by the circuit is applied, an induction heating coil to which a high-frequency alternating current generated by the inverter is supplied, a load placed close to the induction heating coil, and an inverter. A control circuit that detects a starting signal that starts oscillation and an input supplied to the load, and outputs a self-excitation signal that causes the inverter to self-oscillate based on this detection signal, and a control circuit that outputs a self-excitation signal that causes the inverter to self-oscillate upon receiving the signal from the control circuit. In an induction heating cooker including a drive circuit that drives the inverter, and a power supply circuit that supplies drive voltage to the drive circuit and the control circuit, the power supply circuit includes a transformer that steps down the AC power supply voltage, and a secondary side of the transformer. two resistors connected in series, a first output terminal taken out from the connection terminal of the resistors, a rectifier circuit for rectifying the output of the transformer, a smoothing circuit provided on the output side of the rectifier circuit, and an output of the smoothing circuit. a second output terminal to be obtained, a third output terminal to which the output of the smoothing circuit is output via a constant voltage circuit, the first output terminal voltage is given to the control circuit as a reference signal, and the second output terminal An induction heating cooker characterized in that a voltage is supplied to the drive circuit as a drive power source, and a third output terminal voltage is supplied to the control circuit as a drive voltage.