CIRCUIT FOR LED DRIVER

摘要

A circuit for a LED driver adjusts current output depending on whether one or more lamps are connected to the driver. The circuit includes a transformer with a first primary winding having a first winding direction and configured to receive current in a first direction when coupled to a first load. The first primary winding is positioned to induce current in a secondary winding in a second direction. The circuit also includes a second primary winding having a second winding direction and configured to receive current in a third direction when coupled to a second load. The second primary winding is positioned to induce current in the secondary winding in a fourth direction. The second and fourth directions are opposed such that the induced currents will cancel to the extent that a magnitude of each induced current is equal.

主权项

1. A load detection circuit for operating with one or more loads, comprising:
a transformer, comprising:
a secondary winding,a first primary winding having a first winding direction and configured to receive current in a first direction when coupled to a first load, wherein the first primary winding is positioned to induce current in the secondary winding in a second direction when current is flowing through the first primary winding in the first direction; anda second primary winding having a second winding direction and configured to receive current in a third direction when coupled to a second load, wherein the second primary winding is positioned to induce current in the secondary winding in a fourth direction when current is flowing through the first primary winding in the third direction,a diode bridge coupled to the secondary winding and configured to produce the same polarity output for either polarity of current in the secondary winding,wherein the second and fourth directions are opposed such that the induced currents cancel to the extent that a magnitude of each induced current is equal.