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

Claim 1:
2. The plasma processing apparatus of claim 1, wherein the power supply unit includes:
a microwave generation unit configured to generate a pulse-modulated microwave as the power;
an output unit configured to output a microwave propagated from the microwave generation unit;
a first directional coupler configured to output a part of a traveling wave propagated from the microwave generation unit to the output unit; and
a measurement unit configured to determine a first high measurement value and a first low measurement value respectively indicating a high level and a low level of power of the traveling wave in the output unit based on the part of the traveling wave output from the first directional coupler, and
wherein the microwave generation unit averages the first high measurement value and the first low measurement value at a predetermined moving average time and a predetermined sampling interval,
controls high-level power of the pulse-modulated microwave based on the averaged first 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 and the low-level set power.