SWITCHING POWER SUPPLY CONTROLLER

摘要

In an example embodiment, a controller generates a switch signal for controlling a switch to convert an input signal from a phase cut dimmer into a driving signal for a solid state lighting element. The controller determines a conduction period of the input signal from the phase cut dimmer within a half cycle period of the input signal, determines a burst period within the conduction period is a period of time less than the conduction period, and generates a switch signal comprising a plurality of switching cycles over the burst period. The switch signal has first and second subsets of switching cycles. The controller controls the switching cycles of the second subset such that the average energy transferred per switching cycle to the driving signal is less than the average energy transferred per switching cycle to the driving signal for the switching cycles of the first subset.

主权项

1. A switching power supply controller, the controller configured to generate a switch signal for controlling a switch to convert an input signal from a phase cut dimmer into a driving signal for a solid state lighting element, wherein the controller is configured to;
determine a conduction period of the input signal from the phase cut dimmer within a half cycle period of the input signal; determine a burst period within said conduction period comprising a period of time less than said conduction period; generate a switch signal comprising a plurality of switching cycles over the burst period, the switch signal comprising a first subset of switching cycles and a second subset of switching cycles, wherein the controller is configured to control the switching cycles of the second subset such that the average energy transferred per switching cycle to the driving signal is less than the average energy transferred per switching cycle to the driving signal for the switching cycles of the first subset.