Patent attributes
Proposed are techniques for suppressing an increase in a reflected wave power Pr (synonymous with a reflection coefficient) due to IMD. A high-frequency power supply system for providing a high-frequency power to a connected load includes: a bias power supply that outputs a bias power at a first frequency; a source power supply that outputs a source power at a second frequency higher than the first frequency; and a matching unit including an impedance matching circuit that acquires the bias power and the source power, and provides matching between an impedance on the source power supply side and an impedance on the load side. The source power supply supplies the bias power supply with a sinusoidal synchronizing signal including information about an output frequency to be outputted by the bias power supply, and the bias power supply outputs the bias power of a frequency corresponding to the output frequency included in the sinusoidal synchronizing signal. The matching unit performs a process for dividing a forward wave power due to the source power supply for one cycle of the bias power and a reflected wave power toward the source power supply, into a plurality of sections, a process for performing, with respect to each of the plurality of sections, a frequency matching calculation to determine a frequency setting value for each section, and a process for transmitting the frequency setting value for each section to the source power supply. The source power supply, in accordance with the frequency setting values for the plurality of sections transmitted from the matching unit, outputs the bias power in the plurality of section.
