Transistor Bridge Driver Balance Control
Original Publication Date: 1985-Aug-01
Included in the Prior Art Database: 2005-Feb-19
A linear transistor bridge driver circuit includes a second feedback path to ensure that the bridge transistors turn on equally despite component. The first feedback path senses the voltage across resistors in opposite arms of the bridge to provide current feedback to the input. The second feedback path uses voltage feedback from the load to ensure that the driving pair of transistors turn on equally. When a transistor bridge driver circuit is used to drive current, an inductive load instability and distortion problems may occur. The circuit described eliminates these problems and also ensures that power and hence temperature rise is shared equally between the driving transistors. In the drawings, Fig. 1 shows the relevant details of the bridge circuit. The four power transistors driving the load are T3, T4, T5, T6 .