H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/7
H02M 5/42 (2006.01) B66B 1/28 (2006.01) H02H 7/12 (2006.01) H02M 5/458 (2006.01) H02P 3/22 (2006.01)
Patent
CA 1268206
ABSTRACT OF THE DISCLOSURE 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.
537529
Hakala Harri
Kahkipuro Matti
Nummi Pekka
Sten Urpo
G. Ronald Bell & Associates
Kone Elevator Gmbh
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