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;
an input voltage detection section which detects an input voltage input to the inverter and outputs input voltage waveform information;
an oscillation detection section which detects oscillation of the magnetron;
a changeover switch which causes the input voltage detection section to output the input voltage waveform information in a time period until the oscillation detection section detects the oscillation of the magnetron; and
a conversion section which converts the input current waveform information and the input voltage waveform information output in the time period until the oscillation of the magnetron is detected into a drive signal of the semiconductor switching element of the inverter.
0 Assignments
0 Petitions
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.
-
Citations
21 Claims
-
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; an input voltage detection section which detects an input voltage input to the inverter and outputs input voltage waveform information; an oscillation detection section which detects oscillation of the magnetron; a changeover switch which causes the input voltage detection section to output the input voltage waveform information in a time period until the oscillation detection section detects the oscillation of the magnetron; and a conversion section which converts the input current waveform information and the input voltage waveform information output in the time period until the oscillation of the magnetron is detected into a drive signal of the semiconductor switching element of the inverter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification