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Inductive power coupling with constant voltage output

  • US 4,800,328 A
  • Filed: 03/02/1988
  • Issued: 01/24/1989
  • Est. Priority Date: 07/18/1986
  • Status: Expired due to Term
First Claim
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1. A constant voltage inductive power coupling for magnetically transferring electrical power from a power source through an air gap to a load, the coupling comprising:

  • electromagnetic means with substantial leakage reactance, responsive to the power source to generate a shaped alternating magnetic field;

    a saturable core in spaced-apart relationship to the electromagnetic means to define an air gap there between and magnetically coupled thereto to receive mutual flux of the shaped magnetic field, the core having enlarged poles and a region of reduced cross sectional area such that the region is in a state of magnetic saturation when the amount of magnetic flux that is required to induce the desired constant output voltage is present in the core, thereby tending to limit the output voltage to the desired constant voltage and counteracting any excess electromagnetic force in the electromagnetic means by causing leakage flux from the electromagnetic means;

    a coil, electromagnetically coupled to the core whereby the magnetic field induces voltage in the coil, the voltage determined by the amount of magnetic mutal flux in the core, said saturable core also providing an inductive component of leakage flux which varies in response to any change in input voltage to said electromagnetic means to magnetically counteract an associated change in said field so as to maintain the core in its state of saturation thereby tending to keep the output voltage from said coil constant; and

    a capacitor in electrical communication with said coil to form therewith a tuned circuit that is below resonance at operating frequency when said core is in its saturated state, any increase in output current being associated with a closer approach of the circuit to a resonant condition and thereby tending to maintain the output voltage at a constant level.

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