Regulator tester

  • US 4,369,407 A
  • Filed: 08/24/1981
  • Issued: 01/18/1983
  • Est. Priority Date: 08/29/1979
  • Status: Expired due to Term
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First Claim
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1. Apparatus for testing a regulator independently of the alternator or generator to which it is intended to be connected, said regulator having first and second terminals across which the output voltage of the alternator or regulator is normally applied, said regulator sensing said voltage and switching an internal switch between conductive and nonconductive states when said voltage moves beyond a predetermined acceptable range of values, where said internal switch is coupled between a third terminal of said regulator and one of said first and second terminals to control current flow through the field coil of said alternator or generator to which it is intended to connect said regulator, said apparatus comprising:

  • first static circuit means for generating an output voltage simulating the output of said alternator or generator to which it is intended to connect said regulator and for applying said simulated output voltage across said first and second terminals to cause said regulator, if operating properly, to switch said internal switch between said conductance states; and

    second static circuit means coupled between said third terminal and said one of said first and second terminals to which said internal switch is connected for generating a simulated field current of an alternator or generator and for applying said simulated field current to said third terminal, said second static circuit means comprising a low voltage power supply providing a low voltage power signal having a magnitude substantially smaller than the maximum level of said simulated output voltage, said low voltage supply having an impedance selected such that the magnitude of the current supplied to the internal switch is substantially the same as the rated field current of said alternator or generator with which said regulator is intended to be associated even though the voltage of said low voltage power signal is quite low, whereby little power is dissipated thereby.

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