SHUNT DEVICE IN LIGHTING CONTROL SYSTEM WITHOUT NEUTRAL WIRE

摘要

A device (340, 440, 540) is connected to an output terminal of a controller (330), having a single input terminal connected to a first power terminal of an external power source (305) which outputs an AC voltage between the first power terminal and a second power terminal. The device includes a bleeding circuit (342, 442, 542), and a switching arrangement (344/346, 444/446, 544/546) to detect whether the controller powers a load (320 or disables the load. When the controller is in an OFF state, the switching arrangement connects the bleeding circuit between the output terminal of the controller and the second power terminal to provide a current path between the output terminal of the controller and the second power terminal. When the controller is in an ON state, the switching arrangement disconnects the bleeding circuit between the output terminal of the controller and the second power terminal.

主权项

1. A system, comprising:
an electronic controller having, a single input terminal connected to a first power terminal of an external power source which outputs an AC voltage between the first power terminal and a second power terminal thereof, and a single output terminal connected to a first load terminal of a load which includes at least one light source and which has the first load terminal and a second load terminal, wherein the second load terminal is connected to the second power terminal of the external power source, and wherein the load is configured to receive a load voltage between the first and second load terminals and is further configured to allow a load current to flow between the first and second load terminals, wherein the electronic controller is configured to control at least one of the load voltage and the load current so as to selectively power the load when electronic controller is in an ON state, and to disable the load when electronic controller is in an OFF state; and a shunt device, comprising: a bleeding circuit; and a switching arrangement configured to selectively connect the bleeding circuit between the output terminal of the electronic controller and the second power terminal of the external power source, wherein the switching arrangement is configured to connect the bleeding circuit between the output terminal of the electronic controller and the second power terminal of the external power source when the electronic controller is in an OFF state and the load is powered OFF to provide a current path between the output terminal of the electronic controller and the second power terminal of the external power source, and wherein the switching arrangement is further configured to disconnect the bleeding circuit between the output terminal of the electronic controller and the second power terminal of the external power source when the electronic controller is in an ON state and the load is powered ON.