Circuit arrangement for dimming at least one lamp

Circuit arrangement for dimming at least one lamp

  • CN 1,758,822 B
  • Filed: 09/02/2005
  • Issued: 03/27/2013
  • Est. Priority Date: 09/03/2004
  • Status: Active Grant
First Claim
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1. be used for the circuit arrangement at least one lamp light modulation, it comprises:

  • -for supply voltage (U e) wiring;

    -at input side and for supply voltage (U e) wiring connect and have the input (8) of presetting for light modulation and a light modulating device (10) of at least one switch;

    With -the filtering apparatus (12) that is connected with the output of light modulating device (10), wherein, this filtering apparatus (12) has at least one electric capacity (C1;

    C2) and be used for the output be coupled to electric ballast;

    It is characterized in that,This circuit arrangement has the input impedance correcting device (18) that is connected and is designed to revise effective input impedance in the input of filtering apparatus (12) with filtering apparatus (12) in addition, wherein said input impedance correcting device (18) is designed in parallel or at least one other the electric capacity (C4) of connecting of at least one electric capacity (C2) of relatively described filtering apparatus (12), and definite supply voltage (U e) amplitude and according to this supply voltage (U e) amplitude provide switching signal to the switch (S2) that is connected in series with described other electric capacity (C4), so that for low supply voltage (U in its output (22) e) make described at least one other electric capacity (C4) in parallel with described at least one electric capacity (C2), and for high power supply voltage (U e) then disconnect at least one other electric capacity (C4) and make it invalid, so that only having described at least one electric capacity (C2) to work, this input impedance correcting device (18) is through its input (24) ground connection.

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