Motor driving device and motor unit

Details Motor driving device and motor unit Motor driving device and motor unit

2011-06-14

2011-06-14

Benson, Walter (Department: 2837)

Electricity: motive power systems

Synchronous motor systems

Brushless motor closed-loop control

C318S400300, C318S400320, C318S400350

Reexamination Certificate

active

07960929

ABSTRACT:
A motor driving device includes an output circuit, a control circuit, a backflow preventing diode, and a capacitor. The output circuit is driven by a first voltage, includes a switching element of which turning-on/off is switched according to a switching control signal, and outputs current to motor coils when receiving a pulse-width-modulated first voltage. The control circuit is driven by a second voltage, and includes a position detecting circuit that detects the position of a rotor of the motor and a switching circuit that generates the switching control signal on the basis of the detection result of the position detecting circuit in order to switch the turning-on/off of the switching element. The capacitor performs a charging operation by a voltage applied from an input terminal of the first voltage through the diode, and applies a voltage of a node between the diode and the capacitor to the control circuit.

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A Japanese Office Action dated Jan. 13, 2009 issued in connection with counterpart Japanese Patent Application No. 2007-053657.

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