Control circuit for cryogenically-cooled power electronics emplo

Details Control circuit for cryogenically-cooled power electronics emplo Control circuit for cryogenically-cooled power electronics emplo

1996-12-19

1998-03-10

Krishnan, Aditya

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

H01F 3600

Patent

active

057268738

ABSTRACT:
A control circuit generates signals for controlling the sequence in which selected input signals are carried across the terminals of a polyphase switching conversion circuit. The control circuit includes switching elements galvanically isolated from the selected input signals with the control signals electrically isolated from the switching devices. The control circuit for the conversion circuit is, in essence, electrically isolated from the conversion circuit. The control circuit is configured to have a topology analogous to that of the switching converter and includes conventional switching diodes as well as a light generating device optically coupled to a light sensor which, in response to detection of light from the optically coupled light generating device, provides a control signal to a corresponding switching device. The control circuit also includes a source of regulated and electrically isolated power to operate drive circuitry for the switching devices. The cryogenically cooled switching converter is used to rectify AC input signals generated by a number of variable speed wind-driven turbines, into a DC output signal which can be re-converted into a fixed frequency AC signal, stored, or conveyed via a cryogenically cooled superconducting line to a remote location.
A power generation system includes cryogenically cooled power conversion circuitry for converting alternating current (AC) input signals which have naturally occurring, fluctuating frequency characteristics, into a direct current output signal. The control circuit, described above, may be used to control the power conversion circuitry.

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Mueller et al., "Ultra-High Efficiency Power Conversion Using Cryogenic MOSFETs and HT-Superconductors," pp. 772-778, 1993.
Okamoto et al., "Basic studies on application of superconducting magnetic energy storage to wind electric conversion system," Transactions of the Institute of Electrical Engineers of Japan,1993, Part B vol. 113-B, No. 7, pp. 760-767 (abstract attached) (copy of translation attached).

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