Dimming control for a switching power supply
AssigneePower Integrations, Inc.
InventorsYury Gaknoki, Mingming Mao
Life of this patent
Estimating the term…
Abstract
A controller for dimming control of a switching power supply includes a phase angle measurement block and a drive logic block. The phase angle measurement block is to be coupled to receive an input sense signal. The phase angle measurement block generates a phase angle signal representative of a phase angle of an input voltage of the power supply in response to the input sense signal. The drive logic block is to be coupled to control switching of a switch included in the power supply. The drive logic block controls the switch in a closed loop dimming control when the phase angle is less than or equal to a phase threshold and in a open loop dimming control when the phase angle is greater than the phase threshold.
Claims17
A controller for a power supply, the controller comprising:
- a phase angle measurement block to be coupled to receive an input sense signal, wherein the phase angle measurement block generates a phase angle signal representative of a phase angle of an input voltage of the power supply in response to the input sense signal;
- and
- a drive logic block to be coupled to control switching of a switch included in the power supply, wherein the drive logic block controls the switch in a closed loop dimming control when the phase angle is less than or equal to a phase threshold and wherein the drive logic block controls the switch in a open loop dimming control when the phase angle is greater than the phase threshold.
A controller for a power supply, the controller comprising:
- a phase angle measurement block to be coupled to receive an input sense signal, wherein the phase angle measurement block generates a dimming control signal in response to the input sense signal and wherein the dimming control signal indicates whether a phase angle of an input voltage of the power supply is greater than a phase threshold;
- and
- a drive logic block to be coupled to control switching of a switch included in the power supply responsive to a feedback signal when the dimming control signal indicates that the phase angle of the input voltage is less than or equal to the phase threshold, wherein the drive logic block is further coupled to control the switching of the switch independent of the feedback signal when the phase angle is greater than the phase threshold.
Dependencies are inferred from the claim text.