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Dimming control for LED-based luminaires

  • US 9,967,944 B2
  • Filed: 06/21/2017
  • Issued: 05/08/2018
  • Est. Priority Date: 06/22/2016
  • Status: Active Grant
First Claim
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1. A pulse width modulated (PWM) dimmer comprising:

  • a source terminal;

    a load terminal;

    a power stage coupled between the source terminal and the load terminal and configured to receive from the source terminal an AC supply signal having an envelope with a positive half-cycle and a negative half-cycle for each cycle and provide to the load terminal a pulsed AC load signal that tracks the envelope and comprises a plurality of pulses in each of the positive half-cycle and the negative half-cycle for each cycle based on a control signal;

    an interface configured to receive dimming control information bearing on a dimming level; and

    control circuitry configured to receive the dimming control information from the interface and generate the control signal based on the dimming control information, wherein an RMS value of the pulsed AC load signal varies as the dimming level varies and corresponds to the dimming level.

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