Pulse pneumatic pressure converter

TLDR: In this paper, a pneumatic-electric transducer was used to store an output voltage of a DC-DC converter with high service life at power failure by using a piezoelectric element flapper.

Abstract: PURPOSE: To obtain a pulse pneumatic pressure converter storing an output pneumatic pressure even at power failure with high service life by using a piezoelectric flapper for a pneumatic-electric transducer, dividing a power supply into two systems and backing up only the circuit relating to the piezoelectric element flapper. CONSTITUTION: An output voltage of a DC-DC converter 37 or a voltage of a battery 38 is inputted to a DC-DC converter 39, where the voltage is converted into around DC24V. the voltage V 2 is applied to an input electric circuit comprising an up-down counter 22, a D/A converter 23 and a comparator 24 or the like and a circuit element required minimum for holding an output pneumatic pressure such as a pneumatic-electric transducer 32 or the like. Since the voltage of the battery 38 is used as a backup power supply at power failure although no voltage is inputted to the converter 39 from the converter 37, the converter 39 generates the voltage V 2 . Thus, the piezoelectric element flapper 26 holds a potential corresponding to that at power failure and the output voltage is held to a value at power failure. COPYRIGHT: (C)1985,JPO&Japio