Induction heating cooking device
AssigneePanasonic Corporation
InventorsTakahiro MIYAUCHI, Shinji Kondo
Life of this patent
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Abstract
An induction heating cooking device has an inverter including a resonant circuit, and a heating output control part. The resonant circuit has a resonant capacitor and a heating coil that is magnetically coupled to a load. The inverter has first and second switching elements. The heating output control part performs control by inverting the rate values of the driving periods of the first and second switching elements. The driving of the inverter is thus controlled so that substantially the same heating output is obtained to average the losses of the first and second switching elements.
Claims5
An induction heating cooking device comprising:
- an inverter including
- a series circuit of a first switching element and a second switching element that are connected to ends of a smoothing capacitor,
- a first diode connected to the first switching element in anti-parallel,
- a second diode connected to the second switching element in anti-parallel, and
- a resonant circuit that has a heating coil and a resonant capacitor, and is connected to one of the first switching element and the second switching element in parallel;
- and
- a heating output control part that alternately drives the first switching element and the second switching element, and controls a heating output used when the heating coil induction-heats a load;
- wherein the heating output control part sets driving frequency of the first switching element and the second switching element to be substantially 1/n (where, n is an integer of 2 or more) times higher than resonance frequency of the resonant circuit in heating the load;
- wherein the heating output control part repeatedly switches driving duty defined by rates of a driving period of the first switching element and a driving period of the second switching element, between a first driving duty and a second driving duty different from the first driving duty, and controls the driving duty so that temperatures of the first switching element and the second switching element are at or below a reference temperature;
- and
- wherein the second driving duty is the driving duty at which the driving period of the first switching element and the driving period of the second switching element are inverted in length with respect to the first driving duty, and substantially the same heating coil current and heating output are obtained before and after the switching between the first and second driving duties by alternately driving the first switching element and the second switching element in the same order while the driving frequency is constant.
Dependencies are inferred from the claim text.