Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1986-10-01
1987-06-23
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310331, 310332, H01L 4108
Patent
active
046755675
ABSTRACT:
An electro-pneumatic pressure converter including a switching valve having at least one plate-like piezoelectric element, which is supported at one end in a cantilever manner inside a sealed chamber and a distal end portion of which moves upon application of a voltage, at least two pressure nozzles which are opened and closed upon displacement of the piezoelectric element, and an output channel extending from the sealed chamber to an external portion; a pilot relay for converting a pneumatic pressure signal from the output channel into a pneumatic pressure signal; a pressure sensor for converting the output pressure signal of the pilot relay into an electrical signal; pulse width modulating means for supplying a pulse-width modulation signal corresponding to a difference between the electrical signal from the pressure sensor and an external input signal to the plate-like piezoelectric element of the switching valve; a power supplycircuit for obtaining a predetermined voltage from the external input voltage to supply a voltage to respective portions of the converter; and means for monitoring the external input voltage and inhibiting an output of the switching valve when the external voltage is decreased below a predetermined value smaller than a normal operating range.
REFERENCES:
patent: 3742492 (1973-06-01), Proctor
patent: 4047992 (1977-09-01), Williams et al.
patent: 4556815 (1985-12-01), Ohhashi et al.
patent: 4567394 (1986-01-01), Frisch
patent: 4625139 (1986-11-01), Frisch
Fujiwara Masatoshi
Kuroda Masato
Budd Mark O.
Halista Mitchell J.
Medved Albin
Yamatake-Honeywell Co. Ltd.
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