270 Volt DC system with transient suppressor

Details 270 Volt DC system with transient suppressor 270 Volt DC system with transient suppressor

1991-10-28

1993-09-14

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 361 79, 361 92, H02H 904

Patent

active

052455009

ABSTRACT:
The problem of noise and undesirable oscillations on a DC bus (46) are minimized using a transient suppressor (50) in connection with a 270 volt DC power system (10). The power system (10) includes an excited generator (17) developing AC power rectified to power the DC bus (46) for connection to loads (36). The transient suppressor (50) comprises a resistor (52) and a switch (54) connecting the resistor (52) across the DC bus (46). A control (60) senses bus voltage and load current and controls the switch (54) in response thereto. Indeed, the switch (54) is controlled in one of two modes of operation. The first mode comprises voltage control in which the switch (54) is turned on with a single pulse to reduce over voltage conditions, without introducing EMI noise. The second mode comprises pulse width modulating the switch (54) under low current conditions to reduce low frequency oscillations on the DC bus (46).

REFERENCES:
patent: 4695915 (1987-09-01), Mahalek
patent: 4727448 (1988-02-01), Hanyada et al.
patent: 4849845 (1989-07-01), Schmitt
patent: 4937723 (1990-06-01), Rozman et al.
patent: 5132894 (1992-07-01), Rozman et al.
patent: 5144517 (1992-09-01), Wieth
patent: 5189587 (1993-02-01), Haun et al.

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