Title:
TRIANGULAR WAVEFORM GENERATING CIRCUIT, GENERATING METHOD, INVERTER USING THEM, LIGHT EMITTING DEVICE AND LIQUID CRYSTAL TELEVISION
Document Type and Number:
WIPO Patent Application WO/2008/029509
Kind Code:
A1
Abstract:
A charging/discharging circuit (32) charges or discharges a capacitor (C2)
having an end the potential at which is fixed. A first comparator (COMP1) compares
an output voltage (Vout) of the capacitor (C2) with a first threshold voltage
(Vmin) to output a first comparison signal (S1) in accordance with a comparison
result. An edge detecting circuit (34) detects the edges of an externally applied
synchronization signal (SYNC_IN), the frequency of which is equal to approximately
a half of a triangular waveform signal generated by the triangular waveform generating
circuit (30), and outputs an edge detection signal (S4) that exhibits a predetermined
level for each of the detected edges. A charging/discharging control part (40)
refers to both the first comparison signal (S1) outputted by the first comparator
(COMP1) and the edge detection signal (S4) outputted by the edge detecting circuit
(34) to switch, in accordance with the level transitions of these signals, the
charging/discharging states of the charging/discharging circuit (32). The
voltage of the capacitor (C2) is outputted as a triangular waveform signal (Vosc).
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Inventors:
HAGINO JUNICHI (JP)
FUKUMOTO KENICHI (JP)
FUKUMOTO KENICHI (JP)
Application Number:
PCT/JP2007/000949
Publication Date:
March 13, 2008
Filing Date:
September 03, 2007
Export Citation:
Assignee:
ROHM CO LTD (JP)
HAGINO JUNICHI (JP)
FUKUMOTO KENICHI (JP)
HAGINO JUNICHI (JP)
FUKUMOTO KENICHI (JP)
International Classes:
H03K4/06; H02M7/00
Foreign References:
JP2002199242A | 2002-07-12 | |||
JPS62169514A | 1987-07-25 | |||
JP2003274668A | 2003-09-26 | |||
JPH06230267A | 1994-08-19 | |||
JP2004072657A | 2004-03-04 | |||
JP2001345682A | 2001-12-14 | |||
JP2004242403A | 2004-08-26 |
Attorney, Agent or Firm:
MORISHITA, Sakaki (Ebisu-Nishi Shibuya-k, Tokyo 21, JP)
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