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Integrated battery level indicator, method and circuit for a trolling motor controller

  • US 8,188,876 B1
  • Filed: 05/29/2009
  • Issued: 05/29/2012
  • Est. Priority Date: 05/29/2009
  • Status: Active Grant
First Claim
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1. A battery level circuit for a trolling motor, the circuit comprising:

  • an LED driver, the LED driver including a low reference voltage input, a high reference voltage input, and a battery voltage input;

    a low reference voltage generator, including a low reference transistor (Q103), a buffering resistor, an operational amplifier and a voltage divider, wherein the low reference voltage generator receives a reference input, outputs a low reference scaler and provides the low reference voltage input to the LED driver based on the low reference scaler and a maximum battery voltage;

    a high reference voltage generator including a high reference transistor (Q102), a reference diode and the operational amplifier, wherein the high reference voltage generator receives the reference input, outputs a high reference scaler, and provides the high reference voltage input to the LED driver based on the high reference scaler and a maximum battery voltage; and

    a battery voltage input circuit including a battery voltage transistor (Q104), the battery voltage input circuit providing the battery voltage input to the LED driver,wherein the LED driver compares the battery voltage input to the low and high reference voltage inputs and illuminates an appropriate number of a plurality of LEDs according to the comparison.

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