Patent ID: 6222332
Filing Date: 2001-04-24
Classification: H02P,H05K

Abstract:
A compact motor driver circuit comprising:a power bus;an energy storage device connected to the power bus and operable to provide a first source of voltage referenced to a first ground, and provide a means of rejecting noise on the power bus through use of filtering;a secondary power supply connected to the power bus and operable to provide a second source of voltage referenced to a second ground,a hybrid circuit referenced to the second ground connected to the second source of voltage, said hybrid circuit comprising an input to receive motor control commands, a combiner to combine a motor control command with a feedback signal containing wanted and extraneous signals if any, a compensator connected to receive the combined motor control signal and feedback signal and to remove extraneous signals to produce the desired motor control signal, and a pulse width modulator to receive the motor control signal and operable to produce an average voltage control signal;a motor driver circuit connected to receive the average voltage control signal, said motor driver circuit including a first converter to change the average voltage signal from one referenced to the second ground to one referenced to the first ground and to produce a three phase control signal to be presented to a motor; the motor and motor driver circuit operable to produce a feedback signal containing any wanted and extraneous signals for use in the hybrid circuit, and a second converter connected to receive the feedback signal and to change the feedback signal from one referenced to the first ground to one referenced to the second ground for presentation to the combiner; anda single circuit board mounting the energy storage device, the hybrid circuit and the motor driver circuit.