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Power supply means

  • US 3,967,133 A
  • Filed: 02/14/1974
  • Issued: 06/29/1976
  • Est. Priority Date: 02/14/1974
  • Status: Expired due to Term
First Claim
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1. Means for providing power at different preselected voltages from a D. C. source such as from a storage battery of the type used with internal combustion engines comprising a battery source having output terminals at which the battery voltage is available, a housing having first, second and third female receptacle connection means thereon and circuit means in the housing, means including said female connection means connecting the circuit means to the battery output terminals, said circuit means including a current controlled device having emitter and collector elements for connection across the battery terminals, a voltage divider circuit formed by a plurality of series connected resistor elements in series with the current controlled device across the battery terminals, output connection means connected to selected ones of the connection locations between pairs of adjacent resistors in the voltage divider circuit, said output connection means including the second female receptacle means on the housing and means for making connection between selected ones of said second receptacle means and the connection locations depending upon the desired voltage, and other means operatively connected in the circuit means including means operative in response to the battery voltage falling below a predetermined voltage to simultaneously discontinue the supply of power from the battery to the voltage divider circuit and to a load connected across a portion thereof, said last named means also including means which are deenergized when the voltage falls below the predetermined level to indicate the occurrence of this condition, said indicating means being mounted on said housing means, said third female receptacle means including means for making another output voltage available.

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