Patent ID: 11887816
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 2:
3. The plasma processing apparatus of claim 2, wherein the power supply unit further includes a second directional coupler that outputs a part of a reflected wave returning to the output unit,
the measurement unit further determines a second high measurement value and a second low measurement value respectively indicating a high level and a low level of power of the reflected wave in the output unit based on the part of the traveling wave output from the second directional coupler, and
the microwave generation unit averages the second high measurement value and the second low measurement value at the predetermined moving average time and the predetermined sampling interval,
controls high-level power of the pulse-modulated microwave based on the averaged first high measurement value, the averaged second high measurement value, and the high-level set power, and
controls low-level power of the pulse-modulated microwave based on the averaged first low measurement value, the averaged second low measurement value, and the low-level set power.