| 摘要 |
The invention provides a resonant inverter apparatus that allows making the number of sensors small and reducing the cost. In an inverter apparatus comprising an inverter circuit 2A, a resonant circuit 2B, and a control circuit 3, a three phase main circuit, capacitors C1 to C6, and load current sensors Is1 to Is3 are provided in the inverter circuit, a three phase auxiliary circuit and inductor Lr are provided in the resonant circuit, a resonant current arrival determining device 7 and a drive signal generating device 6 are provided in the control circuit, and a maximum value detecting device 12 that detects the absolute value of the maximum value of the load current, a counter setting value output device 13 that outputs the counter setting value that depends on the absolute value of the maximum value of the load current, and a count calculating device 14 that outputs the arrival determination signal after the passage of a time interval that depends on the counter setting value output by the counter setting value output device after the drive signal generating device outputs a predetermined switching timing signal are provided in the resonant current arrival determining device.
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