ELECTROMAGNETIC HEATING DEVICE AND RESONANCE CIRCUIT THEREOF

摘要

A resonance circuit (100) of an electromagnetic heating device and an electromagnetic heating device having the resonance circuit (100). The resonance circuit (100) comprises: a resonance switch tube (10), wherein an emitting electrode of the resonance switch tube (10) is grounded; a resonance module (30), wherein the resonance module (30) comprises a first resonance coil (L1), a second resonance coil (L2), a first resonance capacitor (C1), a second resonance capacitor (C2) and a change-over switch assembly (S1, S2, S3), wherein the first resonance coil (L1) is connected to the second resonance coil (L2) in series and then is connected to a collector electrode of the resonance switch tube (10), and the first resonance capacitor (C1) is connected to the second resonance capacitor (C2) in series and then is connected to the collector electrode of the resonance switch tube (10), and the change-over switch assembly (S1, S2, S3) is used for selecting a resonance inductance and a resonance capacitance which participate in a resonance work; and a controller (20), wherein the controller (20) change the resonance frequency of the electromagnetic heating device by controlling the change-over switch assembly (S1, S2, S3). The resonance circuit (100) can change the resonance frequency of the electromagnetic heating device, reduce the leading voltage when the resonance switch tube (10) is switched on, and reduce the temperature rise of the resonance switch tube (10).