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

Claim 9:
10. The electroplating apparatus according to claim 7, wherein
when the notch of the wafer is not positioned within a coverage area of the third anode, the third rectifier operates in a constant current mode and outputs a constant third current;
with a rotation of the wafer, when the notch of the wafer enters into the coverage area of the third anode, the third rectifier switches to a constant voltage mode, the output voltage of the third rectifier is gradually decreased from a third voltage to a notch plating voltage; and
when the notch of the wafer leaves the coverage area of the third anode along with the rotation of the wafer, the output voltage of the third rectifier is gradually increased from the notch plating voltage to the third voltage.