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Title:
PIEZOELECTRIC TRANSFORMER LIGHT ADJUSTING NOISE REDUCTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2008/012942
Kind Code:
A1
Abstract:
Provided is a light adjusting noise reduction circuit in which the vibration noise accompanying turning ON/OFF of a piezoelectric transformer. A full bridge circuit (2) is controlled by a full bridge drive circuit (5) so as to switch an input voltage (VB1) from an input voltage source (1) and outputs it to a low pass filter (3). The output from the low pass filter (3) is supplied to a piezoelectric transformer (4). The output current (IO) from the piezoelectric transformer (4) is supplied to a discharge tube. Each of FET of the full bridge circuit (2) has a drive frequency decided by a voltage control type oscillator (9). The full bridge circuit (5) is connected to a duty variable circuit (6) and a peak value control circuit (22). The peak value control circuit (22) forms a rise and a fall of a waveform to be (1 - cosωt).

Inventors:
NAMIKI SEIJI (JP)
YOKOTE YASUHIRO (JP)
YAMADA MINORU (JP)
MIZUTANI AKIRA (JP)
SHIMBO ATSUSHI (JP)
Application Number:
PCT/JP2007/000780
Publication Date:
January 31, 2008
Filing Date:
July 20, 2007
Export Citation:
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Assignee:
TAMURA SEISAKUSHO KK (JP)
NAMIKI SEIJI (JP)
YOKOTE YASUHIRO (JP)
YAMADA MINORU (JP)
MIZUTANI AKIRA (JP)
SHIMBO ATSUSHI (JP)
International Classes:
H05B41/24; H02M3/24; H05B41/392
Foreign References:
JPH1066353A1998-03-06
JPH10247593A1998-09-14
JP2001128460A2001-05-11
JPH1094263A1998-04-10
JP2000058289A2000-02-25
JP2000223297A2000-08-11
Attorney, Agent or Firm:
KIUCHI, Mitsuharu (Toranomon-Yoshiara Bldg. 1-6-13, Nishi-Shinbashi, Minato-k, Tokyo 03, JP)
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