Detection voltage output circuit of charge generation type sensi

Details Detection voltage output circuit of charge generation type sensi Detection voltage output circuit of charge generation type sensi

1991-07-03

1992-06-02

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307261, 307491, 307494, H03K 501, H03K 3013

Patent

active

051189666

ABSTRACT:
A detection voltage output circuit of a charge generation type sensing device outputs the charges generated on the sensing device in the form of a voltage. The detection voltage output circuit comprises: a sensing device composed of a dielectric for generating charges in accordance with a change in a physical quantity applied from the outside; a capacitor at a first stage which is connected in parallel to the sensing device and stores the charges generated on the sensing device; a capacitor at a second stage which stores the charges transferred from the capacitor at the first stage; a transfer switch which is provided between the capacitor at the first stage and the capacitor at the second stage so as to transfer the charges stored in the capacitor at the first stage to the capacitor at the second stage; an operational amplifier which is connected to the capacitor at the second stage so as to convert the charges stored in the capacitor at the second stage into a voltage and outputting the thus-obtained voltage; and an output switch which is connected to the output side of the operational amplifier so as to be turned off while at least a part of the charges stored in the capacitor at the first stage are transferred to the capacitor at the second stage and turned on after the transfer switch is turned off to output the voltage from the operational amplifier. The charges generated on the sensing device are output in the form of a voltage.

REFERENCES:
patent: 4274056 (1981-06-01), Lukes et al.
patent: 4454423 (1984-06-01), Koob
patent: 4496858 (1985-01-01), Smith

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