Patent ID: 6147545
Filing Date: 2000-11-14
Classification: H03K

Abstract:
A bridge control circuit for substantially eliminating shoot-through current comprising:an H-bridge circuit;active feedback circuitry coupled to said H-bridge circuit to detect a predetermined half H-bridge output voltage level, and upon said detection enabling turn on of next phase of a drive sequence wherein said H-bridge circuit comprises one or more transistors having output terminals, and wherein the active feedback circuitry comprises:voltage sensor circuitry coupled to said H-bridge circuitry which detects when all of said output terminals of said transistors of said H-bridge circuitry are at said predetermined voltage level and upon said detection outputs a set signal;control circuitry coupled to said voltage sensor circuitry for sending a disable signal to turn all said H-bridge circuitry transistors off upon the receipt of a reset signal; said control circuitry also sends an enable signal upon receipt of said set signal from said voltage sensor;reset circuitry coupled to said control circuitry for receiving input signals signifying which transistors in said H-bridge circuitry are to turn on and which transistors in said H-bridge circuitry are to be tuned off, said reset circuitry outputs said reset signal when any of said input signals have changed logic levels, said reset circuitry also outputs said input signals; andenable circuitry coupled to said reset circuitry and to said control circuitry for outputting a respective transistor enable signal to selected H-bridge transistors upon the receipt of said enable signal from said control circuitry.