POWER CONTROL UNIT FOR HIGH-FREQUENCY DIELECTRIC HEATING AND CONTROL METHOD THEREOF
First Claim
1. A power control unit for a high-frequency dielectric heating for controlling an inverter for driving a magnetron wherein a series circuit made up of at least one set or more of at least two semiconductor switching elements, a resonance circuit, and a leakage transformer are connected to a DC power supply provided by rectifying a voltage of an AC power supply, a switching frequency of the semiconductor switching element is modulated to be converted into high-frequency power, and output occurring on the secondary side of the leakage transformer is applied to the magnetron for energizing the magnetron, the power control unit for a high-frequency dielectric heating comprising:
- an input current detection section which detects an input current input to the inverter from the AC power supply and outputs input current waveform information; and
a conversion section which converts the input current waveform information into a drive signal of the semiconductor switching element of the inverter so as to suppress instantaneous fluctuation of the input current waveform information.
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Accused Products
Abstract
A power control unit for a high-frequency dielectric heating not affected by variations in the magnetron type or characteristic, and power supply voltage fluctuation, etc., is provided. The power control unit for a high-frequency dielectric heating has an input current detection section 71, 72 for detecting input current of an inverter 10 for rectifying 31 an AC power supply voltage 20, performing high-frequency switching of the voltage, and converting the voltage to high-frequency power. The power control unit for a high-frequency dielectric heating converts a switching frequency control signal 92 provided by mixing input current waveform information 90 and power control information 91 into a drive signal of a semiconductor switching element 3, 4 of the inverter.
23 Citations
31 Claims
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1. A power control unit for a high-frequency dielectric heating for controlling an inverter for driving a magnetron wherein a series circuit made up of at least one set or more of at least two semiconductor switching elements, a resonance circuit, and a leakage transformer are connected to a DC power supply provided by rectifying a voltage of an AC power supply, a switching frequency of the semiconductor switching element is modulated to be converted into high-frequency power, and output occurring on the secondary side of the leakage transformer is applied to the magnetron for energizing the magnetron, the power control unit for a high-frequency dielectric heating comprising:
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an input current detection section which detects an input current input to the inverter from the AC power supply and outputs input current waveform information; and a conversion section which converts the input current waveform information into a drive signal of the semiconductor switching element of the inverter so as to suppress instantaneous fluctuation of the input current waveform information. - View Dependent Claims (5, 9, 10, 11, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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2. (canceled)
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29. (canceled)
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30. (canceled)
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31. A power control method for high-frequency dielectric heating of controlling an inverter for rectifying a voltage of an AC power supply, modulating a high switching frequency of a semiconductor switching element, and conducting conversion into high-frequency power, the power control method for high-frequency dielectric heating comprising:
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detecting an input current input to the inverter from the AC power supply; acquiring input current waveform information corresponding to the input current; and converting the input current waveform information into a drive signal of the semiconductor switching element of the inverter so as to suppress instantaneous fluctuation of the input current waveform information.
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Specification