H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/567 (2006.01) G08C 23/04 (2006.01) H02M 1/08 (2006.01) H03K 17/725 (2006.01) H03K 17/79 (2006.01) H04B 10/00 (2006.01)
Patent
CA 2219554
There is provided an SCR firing circuit comprising a diode, a capacitor, and an SCR wherein the diode charges the capacitor for firing the SCR. There is also provided a back to back SCR firing circuit comprising a first and second diode, a first and second capacitor, and an SCR wherein the first diode charges the first capacitor for firing the SCR when a line voltage is positive and the second diode charges the second capacitor for firing the SCR when the line voltage is negative. There is further provided an isolator circuitcomprising at least three opto-couplers arranged in series wherein the opto-couplers isolate a low control voltage from a high power voltage.
L'invention est un circuit d'attaque pour thyristor qui comporte une diode, un condensateur et un thyristor, le condensateur étant chargé par la diode pour déclencher le thyristor. L'invention décrit également un circuit d'attaque à montage tête-bêche pour thyristor qui comprend une première et une seconde diode, un premier et un second condensateur et un thyristor, la première diode chargeant le premier condensateur pour déclencher le thyristor quand la tension de secteur est positive et la seconde diode chargeant le second condensateur pour déclencher le thyristor quand la tension de secteur est négative. L'invention comprend de plus un circuit d'isolement comportant au moins trois optocoupleurs montés en série qui servent à isoler la faible tension de commande de la haute tension d'alimentation.
Fmc Corporation
Sim & Mcburney
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