Power-feeding device and induction heating device

An electric power supply device and electric power technology are applied in the fields of induction heating devices and electric power supply devices, which can solve the problems of inability to improve the manufacturability, reduce the cost of the device, complicated circuit structure, etc., and achieve the improvement of the manufacturability, the easy device design and the cost reduction Effect
CN100521484CActive Publication Date: 2009-07-29NETUREN CO LTD
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
NETUREN CO LTD
Publication Date
2009-07-29

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Abstract

A converter (311) converts an AC voltage value (e) to the DC electric power of a DC voltage value corresponding to a set input. An inverter (312) is controlled by a frequency electric power control circuit part (330) to convert the DC electric power to a dual frequency AC electric power for alternately outputting low and high frequencies at a frequency ratio (duty) corresponding to the set input. A matching transformer (321) having a tap (321C) at which the resonance impedance corresponds to the output impedance of an oscillator circuit part (310) receives the dual frequency AC electric power. A low frequency series resonance circuit (325) or a high frequency series resonance circuit (326) is caused to provide a series resonance, thereby causing an induction heating coil (200) to induction heat an object (201) to be heated. In this way, the single oscillator circuit part (310) and the single induction heating coil (200) are used to effectively induction heat the object (201) by means of the dual frequency resonance.
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Description

technical field

[0001] The present invention relates to a power supply device and an induction heating device for supplying power of different frequencies. Background technique

[0002] Conventionally, there is known a power supply device capable of changing the frequency of AC power supplied to the load when controlling the output of an induction load such as an induction motor or an induction heating device (for example, Patent Document 1).

[0003] In the device described in Patent Document 1, a first inverter for supplying a high frequency and a second inverter for supplying an intermediate frequency are connected in parallel to one induction coil. That is to say, the first converter providing high frequency acts as a series resonant circuit to reduce the intermediate frequency feedback from the second converter providing intermediate frequency through a capacitor (condenser) for series compensation of reactive power of the induction coil. In addition, while a capacitor...

Claims

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