Flux-balanced variable frequency inverter
AssigneeMcDonnell Douglas Corporation
InventorLawrence G. Meares
Life of this patent
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Abstract
Replacing the timing core of a conventional two-core inverter with a magnetic amplifier allows for control of frequency and for B-H loop symmetry. Switching of the magnetic amplifier results in inverter commutation rather than the familiar pulse width modulation.
Claims6
In a two-core inverter comprising two transistor switches, a power core and a timing core, the improvement comprising a flux-balanced, variable frequency inverter wherein the timing core of the two-core inverter is replaced by a magnetic amplifier assembly comprising a control core assembly having two cores which are connected with a control winding;
- said inverter further comprising:
- a control current feedback means connected between a frequency-proportional control current source and the control winding of the magnetic amplifier;
- and,
- a flux excursion balancing means comprising two separate feedback magnetic amplifier windings about the control core assembly of the magnetic amplifier connected in opposing directions between an input DC voltage source and a center tap on the input side of an output transformer on the power core of the inverter.
A flux balanced, variable frequency inverter comprising:
- two transistor switches, a power core assembly which comprises a set of primary windings comprising a center tapped input winding and an output winding, and a magnetic amplifier assembly which comprises a core assembly having two cores having a common control winding and separate gate windings;
- a control current feedback means connected between a frequency-proportional control current source and the control winding of the magnetic amplifier;
- and
- a flux excursion balancing means comprising first and second separate feedback windings about the cores of the magnetic amplifier core assembly connected in opposing directions between an input DC voltage source and a center tap on the input winding of the power core assembly.
Dependencies are inferred from the claim text.