Automatic overvoltage protection circuit

Details Automatic overvoltage protection circuit Automatic overvoltage protection circuit

1988-07-06

1989-03-21

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 54, 363129, H02H 7125, H02P 1324

Patent

active

048150525

ABSTRACT:
An automatic overvoltage protection circuit is provided for an electrical power supply of the type comprising a variable speed three phase alternator (50) having a permanent magnet rotor and three stator output windings (51, 52 and 53), a gated three phase rectifier bridge (60) connected to the three stator output windings and producing a d.c. output voltage, and a control circuit (120) for supplying gating signals at controlled firing angles to the gated three phase rectifier bridge. The control circuit includes first, second and third reference circuits (73, 74 and 75) each including a resonant LRC circuit and connected to a respective one of the three stator output windings, a gating logic circuit (135) connected to the first, second and third reference circuits and providing six outputs, feedback means (122) connected to receive the d.c. output voltage for generating an error voltage, and comparator and isolation means (140 and 145) connected to the gating logic circuit and to the feedback means for generating firing signals for the gated three phase rectifier bridge. The automatic overvoltage protection circuit limits the firing angle of the firing signals at high speed of the alternator to .congruent.59.degree. while allowing the firing angle of the firing signals at low speed to be .congruent.0.degree.. This is accomplished by deliberately selecting the Q and resonant frequency of the reference circuits to achieve this beneficial result.

REFERENCES:
patent: 3825812 (1974-07-01), De Buhr
patent: 4218729 (1980-08-01), Chambers
patent: 4455598 (1984-06-01), Andre
patent: 4598353 (1986-07-01), Leuthen
patent: 4752751 (1988-06-01), Walker
patent: 4757436 (1988-07-01), Ueda et al.

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