Patent ID: 11887817
Assignee: TOKYO ELECTRON LIMITED
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. The plasma processing apparatus according to claim 1, wherein the power source system comprises:
a first direct current power source including a positive terminal connected to a ground, the direct current power source being a variable direct current power source;
a first circuit configured to generate the first pulse and the second pulse from a negative voltage output from a negative terminal of the first direct current power source;
a second direct current power source including a negative terminal connected to a ground; and
a second circuit configured to generate a single pulse from a positive voltage output from a positive terminal of the second direct current power source, wherein
the first circuit includes:
one or more first switching transistor connected in series between the positive terminal of the first direct current power source and a first node;
one or more second switching transistor connected in series between the negative electrode of the first direct current power source and the first node;
a first diode having a cathode connected to the positive terminal of the first direct current power source and an anode connected to a second node which is connected to the first node and the electrode of the substrate support; and
a second diode having a cathode connected to the second node and an anode connected to the negative terminal of the first direct current power source, and

the second circuit includes:
one or more third switching transistor connected in series between the positive terminal of the second direct current power source and a third node;
one or more fourth switching transistor connected in series between the negative electrode of the second direct current power source and the third node;
a third diode having a cathode connected to the positive terminal of the second direct current power source and an anode connected to a fourth node which is connected to the third node and the electrode of the substrate support; and
a fourth diode having a cathode connected to the fourth node and an anode connected to the negative terminal of the second direct current power source.