Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rectifier
Patent
1982-07-14
1985-04-23
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rectifier
324123R, 324132, G01R 1922, G01R 130
Patent
active
045132453
ABSTRACT:
In a DC current detector, a current to be detected is applied to a current detecting resistor connected in series with a first diode, a voltage across the current detecting resistor is amplified by a transistor and the detected voltage is output from a collector resistor connected to the collector of the transistor. The voltage across the current detecting resistor is provided across the emitter and base of the transistor via an emitter resistor, and a second diode. A resistor the resistance value of which is selected so that the forward voltage of the second diode and the base-emitter voltage of the transistor may become equal to each other, is connected to the base of the transistor. The current detection accuracy is improved.
REFERENCES:
patent: 1966047 (1934-07-01), Ryall
patent: 2198226 (1940-04-01), Peterson
patent: 2294065 (1942-08-01), Anderson
patent: 3962631 (1976-06-01), Poppinger
Fujitsu Ten Limited
Karlsen Ernest F.
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