Patent ID: 11870363
Assignee: CYPRESS SEMICONDUCTOR CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC H

Claim 19:
20. The method of operating the secondary side controller of claim 19, wherein the secondary side controller further comprises a diode coupled between the capacitor and the ground, a second current mirror, a second variable current source, and a valley detect transistor coupled to the diode-connected transistor and to an output of the current mirror, the method of operating the secondary side controller further comprising:
providing, by the second variable current source, a second reference current to an input of the second current mirror;
transitioning a drain of the valley detect transistor to a low voltage in response to a voltage at the diode swinging towards a negative voltage; and
transitioning the drain of the valley detect transistor to a high voltage in response to the voltage at the diode swinging back toward a positive voltage.