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Illumination driving circuit

  • US 8,648,543 B1
  • Filed: 11/21/2012
  • Issued: 02/11/2014
  • Est. Priority Date: 11/21/2012
  • Status: Expired due to Fees
First Claim
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1. An illumination driving circuit for driving a light-emitting load, the illumination driving circuit comprising:

  • a system voltage source;

    a switch component coupled between the system voltage source and the light-emitting load;

    an inductor component connected in series between the switch component and the light-emitting load;

    an inductor-current sensing module comprising a sensing resister component connected in series between the switch component and the inductor component; and

    a control module coupled to a controlling terminal of the switch component and configured for controlling a conductive state of the switch component, a virtual ground terminal of the control module being coupled between the sensing resister component and the inductor component, an inductor-current sensing terminal of the control module being coupled between the sensing resister component and the switch component, the control module calculating an inductor-current through the inductor component according to a voltage level of the inductor-current sensing terminal.

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