Patent ID: 7498755

Claim:
An apparatus for controlling rotation direction and speed of a brushed motor, comprising: a brushed motor having a first power terminal connected to a voltage source; a first power transistor coupled between a voltage source return and a second power terminal of the brushed motor; a voltage boost inductor; a second power transistor; a third power transistor; and a power diode; wherein one end of the voltage boost inductor is coupled to the voltage source, the other end of the voltage boost inductor is coupled to the third power transistor and the power diode, the third power transistor is coupled between the voltage source return and the voltage boost inductor, and the second power transistor is coupled between the power diode and the second power terminal of the motor; whereby when the first power transistor is on and the second power transistor is off the brushed motor rotates in a first direction, when the second transistor is on and the first transistor is off the brushed motor rotates in a second direction, and when the third power transistor is on current flows through the voltage boost inductor from the voltage source to the voltage source return.