Method of and apparatus for controlling the braking resistor of

Details Method of and apparatus for controlling the braking resistor of Method of and apparatus for controlling the braking resistor of

1987-05-20

1988-04-12

Wong, Peter S.

Electric power conversion systems

Current conversion

Including an a.c.-d.c.-a.c. converter

363 37, 318380, H02J 336

Patent

active

047379006

ABSTRACT:
A method of and apparatus for controlling a braking resistor, provided in a d.c. circuit of a frequency converter, by rectifying a mains voltage, by means of a first rectifier bridge connected to a three-phase mains supply, to form an actual value voltage; comparing said actual value voltage and a reference voltage; and operating a switch in series with the braking resistor to cause the latter to conduct when the comparison indicates that the actual value voltage is greater than the reference voltage. The reference voltage is formed from a rectified voltage obtained from the three-phase mains supply and rectified by a second rectifier bridge.

REFERENCES:
patent: 4284936 (1981-08-01), Bailey et al.
patent: 4338525 (1982-07-01), Kilgore
patent: 4482031 (1984-11-01), Yoshida et al.
patent: 4651266 (1987-03-01), Fujioka et al.

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