Electricity: power supply or regulation systems – Remote sensing
Patent
1974-10-10
1976-07-27
Pellinen, A. D.
Electricity: power supply or regulation systems
Remote sensing
321 10, 323 16, G05F 308
Patent
active
039719790
ABSTRACT:
A circuit for providing an output direct current which is a linearly proportional analog of the average and the effective magnitude of a sinusoidal input voltage or current. A transformer couples the sinusoid to a rectifier which applies a rectified sinusoid to a filtered current mirror circuit of low power requirements in order to provide a ripple free, high impedance current source output. The current mirror circuit is imbalanced in order to provide a non-linear characteristic which compensates for the transformer-rectifier non-linearity. The current mirror circuit also has an RC feedback network with sufficient feedback and gain to obtain an active, low pass filter characteristic. Component values are selected to give a sharp cutoff, active filter just below the ripple frequency to give efficient ripple elimination yet permit a rapid response time. Matched, parallel connected semiconductor devices in the current mirror circuit permit circuit balance with the current in one branch being an integral multiple of current in the other branch.
REFERENCES:
patent: 3588672 (1971-06-01), Wilson
patent: 3626313 (1971-12-01), Zuk
patent: 3679963 (1972-07-01), Free et al.
patent: 3835410 (1974-09-01), Wittlinger
patent: 3840819 (1974-10-01), Steckler
patent: 3857105 (1974-12-01), Avery
new Semiconductors, Electronics, vol. 42, Apr. 28, 1969, pp. 139-141.
Schlotzhauer et al., "An Improved Multioutput Current-Controlled Source", Proceedings of the IEEE, Aug. 1973, pp. 1154, 1155.
Esterline Corporation
Foster Frank H.
Pellinen A. D.
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