| 摘要 |
A H-bridge circuit for supplying a load with a defined current is disclosed, comprising a first transistor for coupling a first terminal of said load to a positive potential of a power source; a second transistor for coupling said first terminal of said load to a negative potential of said power source; a third transistor for coupling a second terminal of said load to said positive potential of said power source; and a fourth transistor for coupling said second terminal of said load to said negative potential of said power source. The circuit further comprises a current sensing circuitry for sensing a current flowing through said load and for generating a voltage signal representative of said current, and a control circuit for individually controlling the operation of said first, second, third and fourth transistors by respective first, second, third and fourth control signals, said control circuit being configured for operating two transistors of said first, second, third and fourth transistors in switching mode and for operating the remaining two transistors in linear mode. According to the invention, each of said linear mode transistors has a feedback circuit associated therewith, said feedback circuit being operatively coupled to said control circuit and to said current sensing circuitry, said feedback circuit controlling the associated linear mode transistor so that a difference between the voltage signal of said current sensing circuitry and the respective control signal from said control circuit is minimized. |
