Patent ID: 7221102
Filing Date: 2007-05-22
Classification: H02M,Y02B

Abstract:
1. A high-frequency power supply device including an oscillator to output a high-frequency signal, an amplifier to amplify the output of the oscillator for supplying a high-frequency output to a load, and a direct-current power supply to supply a direct-current power voltage to the amplifier, the high-frequency power supply device comprising: a direct-current output detector connected between the direct-current power supply and the amplifier to detect at least the direct-current power voltage supplied from the direct-current power supply to the amplifier; a high-frequency output detector connected between the amplifier and the load to detect the high-frequency output supplied from the amplifier to the load; a loss calculator that calculates a loss generated in the amplifier; a first controller which, when the calculated loss by the loss calculator exceeds a loss set value determined beforehand, causes the direct-current power supply to lower the direct-current power voltage supplied to the amplifier from the direct-current power supply until the calculated loss becomes equal to the loss set value, the first controller further causing, when the calculated loss is no greater than the loss set value, the direct-current power supply to maintain the direct-current power voltage supplied to the amplifier from the direct-current power supply at an appropriate direct-current voltage set value; and a second controller which controls the output of the oscillator or the amplifier so that the high-frequency output supplied to the load from the amplifier approaches a high-frequency output set value.