H - Electricity – 03 – K
Patent
H - Electricity
03
K
H03K 17/68 (2006.01) G05F 3/04 (2006.01) H03K 17/725 (2006.01) H03K 17/79 (2006.01) H05B 37/02 (2006.01) H05B 39/04 (2006.01) H05B 39/06 (2006.01)
Patent
CA 2429565
A switching circuit which facilitates electrically controlled actuation of a switching device, such as a relay, in a two-wire circuit where access may be gained only to an active conductor. The switching circuit (10) comprises an electrically actuatable switching device (19) which is arranged to be connected in series with a load in the form of a lamp (11) in a single phase ac circuit (18). A solid state second switching device (20) is connected in series with the first switching device (19). A first energy storage device (21) is connected across the first and second switching devices and arranged under controlled conditions to deliver actuating power to an actuating element (22) of the first switching device (19). Also, a second energy storage device (23) is connected across the second switching device (20) and is arranged to provide power for gating the second switching device. Gating circuitry (24) associated with the second energy storage device (23) is provided to effect periodic ON-OFF gating of the second switching device (20) during the time that the first switching device (19) is actuated to a conducting state. Circuit connections (25 and 26) are made to the first and second energy storage devices (21 and 23) from the junction (27) of the first and second switching devices (19 and 20), the circuit connections providing for charge replenishment of the first energy storage device (21) and charging of the second energy storage device (23) during the OFF gating periods of the second switching device (20).
L'invention concerne un circuit de commutation facilitant la commande d'un dispositif de commutation du type relais, dans un circuit à deux fils qui permet uniquement l'accès à un conducteur actif. Le circuit de commutation (10) comporte un dispositif de commutation électrique (19) pouvant être relié en série avec une charge sous forme de lampe (11), dans un circuit à courant alternatif à phase unique (18). Un second dispositif de commutation transistorisé (20) est relié en série avec le premier (19). Un premier dispositif de stockage d'énergie (21) est couplé aux bornes des deux dispositifs de commutation, pouvant fonctionner sous commande pour alimenter un élément d'activation (22) du premier dispositif de commutation (19). Par ailleurs, un second dispositif de stockage d'énergie (23) est couplé aux bornes du second dispositif de commutation (20), alimentant la commande par porte du second dispositif de commutation. Des circuit de commande par porte (24) associés au second dispositif de stockage d'énergie (23) assurent la commande par porte périodique MARCHE-ARRET du second dispositif de commutation (20), durant la période de passage du premier dispositif de commutation (19) à l'état conducteur. Des connexions de circuit (25 and 26) sont établies avec les premier et second dispositifs de stockage d'énergie (21 and 23) depuis la jonction (27) des premier et second dispositifs de commutation (19 and 20), ces connexions assurant la recharge du premier dispositif de stockage d'énergie (21) et la charge du second dispositif de stockage d'énergie (23) pendant les périodes de commande par porte ARRET du second dispositif de commutation (20).
H.p.m. Industries Pty Ltd.
Marks & Clerk
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