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    • 9. 发明公开
    • A CONTROL CIRCUIT FOR A PHASE-CUT DIMMER AND A METHOD OF CONTROLLING A PHASE-CUT DIMMER
    • EP3716734A1
    • 2020-09-30
    • EP20174934.8
    • 2012-05-18
    • Silergy Corp.
    • Blom, Anton
    • H05B39/02H05B45/10H05B45/37H05B45/3575
    • A circuit for dimming a lighting load (72), said circuit comprising an AC leading-edge phase-cut dimmer (74) and a control circuit (73), wherein said dimmer (74) is adapted to be connected to an AC supply (71) via the control circuit and comprises a phase-cutting switch and a timing capacitor, wherein said control circuit (73) is adapted to be connected to the lighting load to supply said lighting load, wherein said control circuit comprises a detection circuit (78) adapted to detect a deadlock state of said dimmer (74), wherein the deadlock state is a state in which a voltage at a control terminal of said phase-cutting switch does not reach a predetermined trigger level required to turn on said phase-cutting switch, wherein said control circuit further comprises:
      - an activation circuit (76) electrically coupled in series with said dimmer (74) and said lighting load (72), wherein in normal operation, said activation circuit (76) is inactivated,wherein in response to said detection circuit (78) detecting a deadlock state of said dimmer (74), said detection circuit is adapted to activate said activation circuit (76) so that said activation circuit (76) performs single sided rectification in order to supply a DC current to said dimmer (74), until the voltage at the control terminal of said phase-cutting switch reaches the predetermined trigger level to exit the deadlock state thereby activating said dimmer (74).