Motor driving circuit and method

Details Motor driving circuit and method Motor driving circuit and method

1996-12-20

1998-09-22

Sircus, Brian

Electricity: motive power systems

Positional servo systems

With particular motor control system responsive to the...

318109, 318254, 318439, 318442, 318500, 318504, H02P 154

Patent

active

058119531

ABSTRACT:
A motor driving circuit coupled to a motor having a plurality of phases of coils includes a standard power source generating a first power supply voltage, and a step-up power source for generating a second power supply voltage greater than the first power supply voltage. A selecting circuit selects either the first power supply voltage or the second power supply voltage in response to a selecting signal. A motor driving circuit causes currents to flow in the phases of the motor in accordance with motor driving signals respectively related to the phases in a state in which a selected power supply voltage output by the selecting circuit is applied to one or more phases. A switching unit generates the selecting signal on the basis of the motor driving signals and a voltage signal corresponding to a current flowing through at least one of the phases of the motor so that the second power supply voltage is selected first and the first power supply voltage is selected second with respect to each of the phases.

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