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Compact converter plug for LED light strings

  • US 9,226,351 B2
  • Filed: 09/15/2014
  • Issued: 12/29/2015
  • Est. Priority Date: 08/26/2009
  • Status: Active Grant
First Claim
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1. A converter plug for an LED light string that plugs into a household alternating current socket that converts alternating current household power to a low voltage direct current output comprising:

  • an enclosure that is watertight and has a shape and size similar to a wall plug;

    plug blades that have a watertight seal with said enclosure;

    a printed circuit board having converter circuitry mounted on at least one surface of said printed circuit board, said printed circuit board mounted in said enclosure, said converter circuitry comprising;

    a rectifier that rectifies a source of alternating current from a household socket to produce a rectified alternating current signal at an output of said rectifier;

    a low pass filter, connected to said output of said rectifier, that filters said rectified alternating current signal to provide a filtered, rectified, alternating current signal;

    a high speed switching transistor that modulates said filtered, rectified, alternating signal to produce a modulated, rectified signal having a selected modulation frequency;

    a first coil, in a transformer, coupled to said modulated, rectified signal that induces voltage changes in a second transformer coil to produce a second induced voltage and induces voltage changes in a third transformer coil to produce a third induced voltage;

    a voltage detection circuit connected to said third transformer coil that produces a monitoring signal, without an optical coupler, from said third induced voltage on said third transformer coil that is proportional to said second induced voltage on said second transformer coil;

    a controller that controls said selected modulation frequency of said modulated, rectified signal in response to said monitoring signal.

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