Switching arrangement for full-wave power control which is insensitive to mains voltage fluctuations
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United States of America Patent
Stats
-
Oct 27, 1987
Grant Date -
N/A
app pub date -
Jul 8, 1986
filing date -
Jul 10, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
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).
First Claim
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International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 7 Citation Count
- G05F Class
- 0 % this patent is cited more than
- 38 Age