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Low voltage warning circuit

  • US 8,258,971 B2
  • Filed: 06/17/2010
  • Issued: 09/04/2012
  • Est. Priority Date: 04/02/2010
  • Status: Expired due to Fees
First Claim
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1. A low voltage warning circuit, comprising:

  • an input terminal configured to receive a supply voltage;

    a reference voltage circuit comprising a first terminal connected to the input terminal and a second terminal grounded;

    a transistor comprising a base connected to a first node between the input terminal and the reference voltage circuit, an emitter connected to the input terminal, and a collector; and

    a silicon controlled rectifier comprising a control terminal connected to the collector, a first anode connected to the input terminal via a indicating device, and a first cathode grounded;

    wherein the reference voltage circuit provides a reference voltage to the base, the indicating device raise a warning when the supply voltage below the summation of the reference voltage and a switching voltage of the transistor.

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