Title:
振動型アクチュエータを駆動するための両側自励発振回路
Document Type and Number:
Japanese Patent JP2004528796
Kind Code:
A
Abstract:
A dual sided self-oscillation circuit for driving an oscillatory actuator with high efficiency and high response speed. The actuator has a winding to receive a periodical supply current from a power source and oscillates in a predetermined resonant frequency. The self-oscillation circuit includes a bandpass filter for receiving a back electromotive force voltage (Vbemf) developed across the winding and producing a sine wave output signal, a comparator for comparing the sine wave output signal with a threshold voltage and producing two drive pulses per cycle of the resonant frequency, and a switch connected in series with the winding to connect or disconnect the power source to the winding in response to the drive pulses, thereby flowing electric current in two directions at each cycle.
Inventors:
Harry Suha
Application Number:
JP2002592275A
Publication Date:
September 16, 2004
Filing Date:
May 17, 2002
Export Citation:
Assignee:
MATSUSHITA ELECTRIC WORKS,LTD.
International Classes:
H02P25/06; H02P25/02; (IPC1-7): H02P7/00
Attorney, Agent or Firm:
Yasuo Itaya