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Circuit for a small electric appliance with an accumulator and method for measuring a charging current

  • US 9,124,118 B2
  • Filed: 09/13/2012
  • Issued: 09/01/2015
  • Est. Priority Date: 09/16/2011
  • Status: Active Grant
First Claim
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1. A circuit for a small electric appliance, comprising:

  • a battery having a negative terminal and a positive terminal;

    a current-sensing resistor sensing a charging current;

    a control circuit measuring the charging current of the battery;

    a DC-DC converter directly connected to the battery such that the DC-DC converter is directly connected to both the negative terminal of the battery and the positive terminal of the battery, wherein the DC-DC converter supplies power to the control circuit from the battery; and

    wherein the control circuit has a measurement input (ADC) which is related to a reference potential, wherein the reference potential is connected via the current-sensing resistor (R1) to the negative terminal of the battery.

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