Patent ID: 9554425
Date: 2017-01-24
CPC Classifications: H02M,H05B,Y02B

Claim:
1. An induction heating device comprising: a rectifying circuit that rectifies an AC power supply; a smoothing capacitor that smooths the rectified output to obtain a DC power supply; a first and a second inverters each composed of a heating coil, a resonance capacitor, and a switching element, and connected to the smoothing capacitor in parallel; a first and a second oscillating circuits that supply a first and a second drive signals to the switching elements respectively, the first and second drive signals each having a driving period in which driving pulses are supplied and a driving stop period in which the driving pulses are not supplied; and a controller that controls drive of the first and second oscillating circuits, wherein the controller alternately drives the first and second oscillating circuits, and varies a ratio of the driving period of the first drive signal to the driving period of the second drive signal in accordance with a power change amount generated every time the drive is switched between the first and second oscillating circuits so that the power change amount is not more than a predetermined amount.