Constant current source

Details Constant current source Constant current source

1978-08-16

1980-10-14

Shoop, William M.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

323 4, 323 9, 323 22SC, 363128, H02P 1326

Patent

active

042284945

ABSTRACT:
A constant current circuit including a silicon controlled rectifier connected to transmit current flow from an ac supply to a load. A sensor circuit provides a load signal having a level dependent upon the current flow through the load and a reference circuit provides a reference signal having a predetermined given level. Receiving the load and reference signals is a comparator with an output connected to an SCR firing control network that furnishes firing signals to a gate of the silicon controlled rectifier. The output from the comparator varies the firing signal produced by a phase shift network in response to a reference signal level greater than the level of the load signal and retards the phase of the firing signal in response to a load signal level greater than the given reference level.

REFERENCES:
patent: 3311806 (1967-03-01), Charlwood
patent: 3448342 (1969-06-01), Jacobs
patent: 3460017 (1969-08-01), Eggleston et al.
patent: 3590323 (1971-06-01), Mapham et al.
patent: 3634734 (1972-01-01), Scott
patent: 3713011 (1973-01-01), Johnson et al.
patent: 3838332 (1974-09-01), Hopengarten
patent: 3922595 (1975-11-01), Vieri
patent: 3987354 (1976-10-01), Mason

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