Apparatus and method for reducing overvoltage transients on the

Details Apparatus and method for reducing overvoltage transients on the Apparatus and method for reducing overvoltage transients on the

1978-11-15

1980-09-30

Miller, J. D.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363164, 363161, H02M 500

Patent

active

042259118

ABSTRACT:
An apparatus and method for reducing the overvoltage transients present on the alternating current power signals provided by the cycloconverters of a variable speed constant frequency (VSCF) system during the first several cycles of the alternating current after a load reduction or no-load condition occurs. An overvoltage transient reduction circuit is connected to each of the plurality of D.C. control signals provided by the phase voltage regulators to the waveform generator of a conventional VSCF system. The overvoltage transient circuit and method of the present invention senses the current amplitude level in each of the alternating current power signals in the VSCF system, and automatically reduces the voltage amplitude levels of the D.C. control signals provided by the phase voltage regulators to a preselected lower level within one-half cycle of the alternating current after a load reduction occurs. This reduction in the amplitude level of the D.C. control signals is maintained by the circuit and method of the present invention until the voltage regulating control loop of the conventional VSCF system can again assume control of the voltage levels of the alternating current power signals.

REFERENCES:
patent: 3256244 (1966-06-01), Byloff et al.
patent: 3400321 (1968-09-01), Lafuze
patent: 3419785 (1968-12-01), Lafuze
patent: 3431483 (1969-03-01), Lafuze
patent: 3593106 (1971-07-01), Lafuze
patent: 3684935 (1972-08-01), Sawyer et al.

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