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System and method for providing DC power to an outside electrochromic mirror (OEC) using a pulse width modulated (PWM) input

  • US 8,879,140 B2
  • Filed: 05/10/2012
  • Issued: 11/04/2014
  • Est. Priority Date: 05/12/2011
  • Status: Active Grant
First Claim
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1. A system for supplying DC power derived from a pulse width modulated (PWM) source comprising:

  • a connector configured to be in electrical communication with a PWM power source;

    at least one hold-up circuit in electrical communication with the connector, the at least one hold-up circuit comprising;

    a first hold-up circuit configured to convert a PWM power supplied from the PWM power source to a first DC power and supply the first DC power to a microcontroller; and

    a second hold-up circuit configured to convert the PWM power supplied from the PWM power source to a second DC power, and supply the second DC power to a drive circuit; and

    wherein the microcontroller is configured to control the drive circuit by regulating a DC voltage from the drive circuit to a load, wherein the load is an electrochromic (EC) mirror element.

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