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DC to DC voltage converter

  • US 20030173940A1
  • Filed: 03/12/2002
  • Published: 09/18/2003
  • Est. Priority Date: 03/12/2002
  • Status: Active Grant
First Claim
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1. A DC to DC voltage converter circuit for use with power tools having a motor operable with DC voltage power and at least one battery having positive and ground terminals for supplying power to the converter circuit at a predetermined voltage, the converter circuit providing power at one or more desired operating voltages and comprising:

  • a ground line connecting the battery ground terminal to the motor;

    a capacitor connected in parallel with the motor;

    a switching transistor having a first terminal connected to the battery positive terminal via a diode and a second terminal connected to one end of an inductor that has its other end connected to ground, and a switching control third terminal that can switch the transistor into and out of conduction responsive to switching signals being applied thereto;

    a controller for generating and applying said switching signals to said third terminal, said switching signals having an adjustable frequency and an adjustable duty cycle of conduction and non-conduction within a predetermined range;

    wherein said controller can provide switching signals that cause said converter circuit to supply power at desired operating voltages that are selectively above and below said predetermined voltage.

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