Title:
R.P.M. MEASURING CIRCUIT
Document Type and Number:
Japanese Patent JP3297243
Kind Code:
B2
Abstract:
PURPOSE: To detect a desired r.p.m. quickly and accurately without causing any erroneous function even in the low r.p.m. region.
CONSTITUTION: The r.p.m. measuring circuit 20 determines the r.p.m. based on an r.p.m. signal received from a rotation detector 11 and, when a predetermined r.p.m. is reached, operates a relay drive circuit 39 to delivery a relay contact output to the outside. In the r.p.m. measuring circuit 20, a counter circuit 27 is preset with an initial count based on an r.p.m. signal and the count of the counter circuit 27 is down counted in synchronism with a clock signal. When the initial count is reached, the relay drive circuit 39 is actuated.
Inventors:
Chiaki Okamura
Akira Taniguchi
Akira Taniguchi
Application Number:
JP5556295A
Publication Date:
July 02, 2002
Filing Date:
March 15, 1995
Export Citation:
Assignee:
Toshiba Corporation
International Classes:
G01P3/489; H02P9/04; H02P29/00; H02P101/20; (IPC1-7): G01P3/489; H02P9/04
Domestic Patent References:
| JP60111162A |
Attorney, Agent or Firm:
Takehiko Suzue
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