Title:
TRIANGULAR-WAVE GENERATING CIRCUIT, AND INVERTER, LIGHT EMITTING DEVICE AND LIQUID CRYSTAL TELEVISION USING THE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2007/058217
Kind Code:
A1
Abstract:
A first comparator (32) compares an output voltage (Vout) to appear in a capacitor (C2)
with the maximum threshold voltage (Vmax). A second comparator (34) compares the
output voltage (Vout) with the minimum threshold voltage (Vmin). An edge detecting
circuit (50) detects the edge of a synchronizing signal (SYNC) having a frequency
of about one half of that of the output voltage (Vout), and outputs an edge detection
signal (SE). A charge/discharge control unit (40) refers a first comparison
signal (Vcmp1) and a second comparison signal (Vcmp2), and sets a charge/discharge
circuit (38) in a discharged state, when the output voltage (Vout) becomes higher
than the maximum threshold voltage (Vmax), and the charge/discharge circuit
(38) in a charged state when the output voltage (Vout) becomes lower than the minimum
threshold voltage (Vmin). Moreover, the charge/discharge control unit (40)
switches the charged/discharged state of the charge/discharge circuit (38)
when the edge detection signal (SE) takes a predetermined level.
Inventors:
FUKUMOTO KENICHI (JP)
Application Number:
PCT/JP2006/322772
Publication Date:
May 24, 2007
Filing Date:
November 15, 2006
Export Citation:
Assignee:
ROHM CO LTD (JP)
FUKUMOTO KENICHI (JP)
FUKUMOTO KENICHI (JP)
International Classes:
H03K4/06; H02M7/48
Foreign References:
| US5394020A | 1995-02-28 | |||
| JP2000091909A | 2000-03-31 | |||
| JPS63275220A | 1988-11-11 | |||
| JPH03256405A | 1991-11-15 |
Attorney, Agent or Firm:
MORISHITA, Sakaki (Ebisu-Nishi Shibuya-ku Tokyo, 21, JP)
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