Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Demand – excess – maximum or minimum
Patent
1992-10-09
1994-06-28
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Demand, excess, maximum or minimum
324133, 307351, 340662, G01R 1904
Patent
active
053250508
ABSTRACT:
A maximum voltage detecting apparatus for detecting the maximum voltage output from a light sensor, a wind force sensor or the like by using ferroelectric capacitors, and a method of producing ferroelectric capacitors. A plurality of ferroelectric capacitor devices each of which is composed of one ferroelectric capacitor or a plurality of ferroelectric capacitors which have approximately the same thickness and which are connected in series and are arranged in an array are connected in parallel so as to provide a ferroelectric unit. A DC voltage is applied to the ferroelectric unit so as to produce spontaneous polarization. An output voltage of a wind force sensor or the like is applied to the ferroelectric unit at the opposite polarity, and whether or not the polarization of each ferroelectric capacitor device is reversed is detected, thereby detecting the maximum value of the external voltage. Each ferroelectric capacitor is composed of first insulating film, lower electrode, ferroelectric film, second insulating film, and upper electrode which are laminated on a semiconductor substrate in that order.
REFERENCES:
patent: 3401272 (1968-09-01), Rosa et al.
patent: 3947761 (1976-03-01), Arai
patent: 4262257 (1981-04-01), Lawrence
patent: 4706289 (1987-11-01), Jensen
patent: 4725825 (1988-02-01), McKean
Brown Glenn W.
Rohm & Co., Ltd.
Wieder Kenneth A.
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