Patent ID: 8207695
Filing Date: 2012-06-26
Classification: H02M

Abstract:
1. A control circuit for a full-bridge stage to drive an electric load, the control circuit configured to generate a first PWM signal and a second PWM signal so that a difference between duty-cycles of the first and second PWM signals represents an amplitude of a drive current for the electric load, the control circuit also configured to generate a logic driving command of a half-bridge of the full-bridge stage a logic value of which corresponds to a sign of the drive current by combining the first and second PWM signals, the control circuit also configured to generate a third PWM driving signal of the other half-bridge of the full-bridge stage a duty-cycle of which corresponds to the amplitude of the drive current, the control circuit comprising: a logic XOR gate configured to be input with the first and second PWM signals and generate therefrom a logic XOR signal; a logic sampling circuit configured to generate the logic driving command by sampling one of the first and second PWM signals based upon active switching edges of the logic XOR signal; and a second XOR gate configured to be input with the logic XOR signal and the logic driving command and generate therefrom the third PWM driving signal.