Reduction of Supply Current Variations Using Compensation Current Control

摘要

A power distribution system and method includes a controller that is configured to control a switching power converter. In at least one embodiment, the controller includes a compensation current control circuit to control a compensation current that reduces and, in at least one embodiment, approximately eliminates variations in current drawn by the controller during a particular operational time period. In at least one embodiment, the power distribution system is a lamp that includes the controller, a switching power converter, and one or more light sources, such as light emitting diodes.

主权项

1. An apparatus comprising:
a controller to control a switching power converter, wherein the controller includes:
first circuitry that, during at least one operational time period of the controller, is configured to draw a time varying operational current from an external power source; anda compensation current control circuit to generate a compensation current control signal to control a draw of a compensation current from the external power source by second circuitry so that an average sum of the time varying operational current and the compensation current is approximately constant as the operational current varies in time during the operational time period.