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US 9,438,123 B2Granted
Push-pull LED driver circuit
AssigneeGeneral Electronics Applications, Inc.
InventorJoseph Pernyeszi
Life of this patent
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Abstract
Push-pull circuits are described that are suitable for the driving of LEDs and that reduce the voltage stress on the switching transistors that is caused by the output transformer. The push-pull arrangement caters to reducing the size of the transformer as it eliminates the DC magnetic bias of the transformer core and it also caters to the integration of the semiconductor content of the circuit requiring only low side DMOS to be implemented in the monolithic, junction isolated process.
Claims17
A driver circuit connectable to a load, comprising:
- a DC supply node;
- first and second switches;
- a first rectifier;
- a transformer having first and second primary windings and a secondary winding, wherein the first and second primary windings are respectively connected to ground through the first and second switches and have a center tap connected to the DC supply node, and wherein the secondary winding is connected to the load through the first rectifier when the driver circuit is connected to drive the load;
- and
- control circuitry connected to the first and second switches, whereby the first and second switches are alternately conducting when driving the load,
- wherein, when the driver circuit is connected to drive the load, the load is connected in parallel with the first rectifier and is connected in series with the first and second switches between the DC supply node and ground through the center tap.
4 more elements
Dependencies are inferred from the claim text.