Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means
Patent
1988-12-28
1989-09-12
Smith, Jerry
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With coupling means
324248, 341133, 505827, 505845, G01R 1900, G01R 33035, G01R 1706, A61B 504
Patent
active
048663735
ABSTRACT:
A superconducting current detecting circuit which comprises a reference current generation circuit for generating a reference current and a DC flux parametron circuit for comparing an input current to be detected with the reference current to thereby produce pulses in synchronism with an input excitation signal, the number of the pulses being varied in accordance with a difference between the input current and the reference current, the pulses having positive or negative values depending on the polarity of the difference, the reference current generation circuit having means for increasing or decreasing the reference current by a quantity corresponding to the number of the pulses in response to the polarity of the pulses so that reference current generation circuit produces the reference current which agrees with the input current.
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Goto Eiichi
Harada Yutaka
Hatano Mutsuko
Kawabe Ushio
Miyamoto Nobuo
Baker Stephen M.
Hitachi , Ltd.
Rikagaku Kenkyusko
Smith Jerry
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