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PWM heating system for eye shield

  • US 8,566,962 B2
  • Filed: 02/16/2012
  • Issued: 10/29/2013
  • Est. Priority Date: 02/16/2012
  • Status: Active Grant
First Claim
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1. An eye-shield condensation preventing system comprising:

  • an eye shield adapted for protecting a user'"'"'s eyes and adapted for defining at least a partially enclosed space between the user'"'"'s eyes and said eye shield;

    a power source;

    a pulse-width modulator;

    a metal-oxide-semiconductor field-effect transistor switching means responsive to said pulse-width modulator;

    a heating element on said eye shield;

    a circuit interconnecting said power source, said pulse-width modulator, said switching means and said heating element for controlling heating of said eye shield; and

    current adjustment means operatively connected to said pulse-width modulator for varying duty cycle of the power source via the pulse-width modulator in turn varying the amount of current delivered to the heating element.

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