Switching arrangement for full-wave power control which is insen

Details Switching arrangement for full-wave power control which is insen Switching arrangement for full-wave power control which is insen

1986-07-08

1987-10-27

Beha, Jr., William H.

Electricity: power supply or regulation systems

Input level responsive

Phase controlled switching using electronic tube or a three...

318345H, 323324, 323327, G05F 502

Patent

active

047032480

ABSTRACT:
A switching arrangement for full-wave power control comprising a triac (2), the control electrode of which is preceded by a trigger diode, the control voltage being taken from an RC section having at least one potentiometer (9), which effects a phase shift in the firing time as a function of the position of the potentiometer (9), is improved by the RC section (9, 10) being connected to a constant voltage source. This consists of two Z diodes (6) which are connectd in opposition and which are advantageously bridged by means of an adjustable voltage divider (7, 8), in such a manner that the RC section (9, 10) is connected to an adjustable part voltage. Instead of bridging the triac (2) for full drive, as usual, the trigger diode (11) is connected to a special bias resistor by means of a switch (13). According to a preferred embodiment, the resistors of the switching arrangement consists of a low-temperature thick-film paste printed on a hard paper board (see drawing relating to this).

REFERENCES:
patent: 3634874 (1972-01-01), Mason
patent: 3872374 (1975-03-01), Rasmussen
patent: 4031458 (1977-06-01), Ichikawa
"Thyristoren und Triacs", Ing. Heinz Richter, Franckh'sche Verlagshandlung W. Keller & Co., 1969, pp. 52 and 53.
"Halbleiter-Schaltungstechnik", U. Tietze and Ch. Schenk, Springer-Verlag, 1971, pp. 577 et seq.

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