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Means for controlling battery chargers

  • US 4,223,262 A
  • Filed: 06/12/1978
  • Issued: 09/16/1980
  • Est. Priority Date: 06/12/1978
  • Status: Expired due to Term
First Claim
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1. A voltage following control device comprising a positive terminal, a negative terminal, a relay including a coil and a pair of normally open contacts, a transistor operatively connected to the positive terminal and the negative terminal in series with the relay coil and adapted for going into conduction when a battery is connected across the positive terminal and negative terminal, a voltage following circuit including a Zener diode and first, second and third resistors in series, an electronic switch including a first electrode and a second electrode and adapted for going into conduction when the voltage at the second electrode is more positive than the voltage at the first electrode with respect to the negative terminal, the first electrode being connected to the voltage following circuit between the first and second resistors through a fourth registor and also being connected to the negative terminal through a fifth resistor and the second electrode being connected to the voltage following circuit between the second and third resistor, biasing means operatively connected to the transistor and the electronic switch and adpated for biasing the transistor out of conduction when current flows through the electronic switch, time responsive means operatively connected to the voltage following circuit for increasing the voltage at the second electrode to a level which will place the electronic switch in conduction a predetermined period of time after the battery has become fully charged, whereby to stop the supply of charging current to the battery, and holding means for retaining conduction in the electronic switch while the battery remains charged and connected across the positive and negative terminal.

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