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Low distortion line dimmer and dimming ballast

  • US 6,229,271 B1
  • Filed: 02/24/2000
  • Issued: 05/08/2001
  • Est. Priority Date: 02/24/2000
  • Status: Expired due to Term
First Claim
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1. A dimming ballast apparatus comprising:

  • a firing-angle-to-pulse-width-modulation converter to generate a pulse width modulated signal based on a firing angle of a powering signal from a power-line phase angle dimmer control, wherein the firing angle of each half cycle of the powering signal from the power-line phase angle dimmer control is less than or equal to 30 degrees; and

    a filter to generate a dimming command signal based on the pulse width modulated signal.

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