Title:
CONVERTER PULSE WIDTH SHAPING CIRCUIT AND EXCESSIVE FLOW RATE METER
Document Type and Number:
WIPO Patent Application WO/2007/125725
Kind Code:
A1
Abstract:
A converter pulse width shaping circuit (6) is placed between a flow rate determining part
(1) and a flow rate metering mechanism (3) and further between a waveform shaping
apparatus (4) and an erroneous output preventing apparatus (5). When receiving
a series of pulse signals having a high frequency higher than a predetermined value,
the converter pulse width shaping circuit (6) combines and converts these pulse
signals having the high frequency to a pulse signal having a low frequency, which
is then outputted to the erroneous output preventing apparatus (5) having a low-cut
function. A converter (2) including the converter pulse width shaping circuit
(6) described above is used to compose an excessive flow rate meter.
Inventors:
WASHIO KENJI (JP)
HIROSE TAKASHI (JP)
HIROSE TAKASHI (JP)
Application Number:
PCT/JP2007/057323
Publication Date:
November 08, 2007
Filing Date:
March 26, 2007
Export Citation:
Assignee:
OVAL CORP (JP)
WASHIO KENJI (JP)
HIROSE TAKASHI (JP)
WASHIO KENJI (JP)
HIROSE TAKASHI (JP)
International Classes:
G01F1/32
Foreign References:
| JPS6331725B2 | 1988-06-27 | |||
| JP3144152B2 | 2001-03-12 | |||
| JPH0755518A | 1995-03-03 | |||
| JPS5314199A | 1978-02-08 | |||
| JP3564111B2 | 2004-09-08 |
Other References:
See also references of EP 2009407A4
Attorney, Agent or Firm:
KOBAYASHI, Tamotsu (Sumito Building1-5, Iwamoto-cho 3-chom, Chiyoda-ku Tokyo 32, JP)
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