Patent ID: 6847532

Claim:
A system for producing an output voltage for supplying current to a load, by controlling the switching of a pair of electronic switches in order to eliminate the influence of dead time between switching them, the pair of electronic switches being connectable in a half-bridge arrangement across power supply terminals, with the first switch being connected to a positive power supply terminal, wherein a positive current flow direction is defined with respect to the load, when current flows to the load, said system comprising: first means operable to close and open the first switch of the electronic switch pair in response, respectively, to the ON and OFF times of an input signal waveform; second means operable to open and close the second switch of the electronic switch pair in response, respectively, to the ON and OFF times of said input signal waveform within a cycle thereof; such that in the case where a positive current command is provided to establish a positive current, said first means closes the first switch during the ON time of said input signal waveform, and opens it during the OFF time thereof, while said second means operates to open the second switch at least during the closing time of the first switch, and in the case where a negative current command is provided to establish a negative current, said second means opens said second switch during the ON time of said input signal waveform, and closes it during the OFF time thereof, while said first means operates to open the first switch at least during the closing time of the second switch, the first and second electronic switches operating such that the average output voltage will be precisely in accordance with the average width of said input signal waveform.