Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1990-05-29
1991-09-24
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
Specific condition
363 55, 379 33, G08B 2100
Patent
active
050517309
ABSTRACT:
Monitoring equipment is provided in a charging rectifier for operational monitoring of a converter supplied by the AC voltage supply network and is provided with DC voltage feed via two rectifiers serving the purpose of decoupling, in particular, via one of the two rectifiers from an auxiliary converter likewise supplied from the AC voltage supply network, on the one hand, and via another of the two rectifiers from a DC converter supplied by the DC energy storage device, on the other hand. The DC voltage offered by the DC converter is higher than the DC voltage offered by the auxiliary converter. The monitoring equipment distinguishes between these DC voltages with reference to magnitude and, when receiving a lower DC voltage, checks for the presence of the DC voltage supplied to the DC converter by the DC energy storage device. When receiving the lower DC voltage and given the presence of the DC voltage supplied to the DC converter, the monitoring equipment outputs a signal that indicates a malfunction of the DC converter.
REFERENCES:
patent: 4246633 (1981-01-01), Borkovitz
patent: 4930062 (1990-05-01), Yamada
Crosland Donnie L.
Hofsass Jeffery A.
Siemens Aktiengesellschaft
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