Patent ID: 11926920
Assignee: ACM RESEARCH (SHANGHAI) INC.
Field: Surface technology, coating (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 10:
11. The electroplating apparatus according to claim 7, wherein the third rectifier operates in a DC pulse mode;
when the notch of the wafer is not positioned within a coverage area of the third anode, a duty cycle of an output current of the third rectifier is a high duty cycle;
with a rotation of the wafer, when the notch of the wafer enters into the coverage area of the third anode, the duty cycle of the output current of the third rectifier is gradually decreased from the high duty cycle to a low duty cycle; and
when the notch of the wafer leaves the coverage area of the third anode along with the rotation of the wafer, the duty cycle of the output current of the third rectifier is gradually increased from the low duty cycle to the high duty cycle.