Low cost, high reliability soft start arrangement

Details Low cost, high reliability soft start arrangement Low cost, high reliability soft start arrangement

1995-05-19

1997-05-06

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 50, 361 58, 361106, H02H 7122

Patent

active

056277385

ABSTRACT:
A soft start circuit for a high-power module permits trickle-charging of the capacitor bank prior to power switch actuation, and avoids large current surges or inrush at power up. Positive temperature coefficient thermistor devices, or PTCs are place in shunt across the switch elements or poles of the actuator or other power switch. In a power module that is powered by three-phase AC, the three power conductors are coupled through a three-pole contactor to AC inputs of a polyphase rectifier bridge, which has DC outputs coupled to the capacitor bank and to a load device, such as a high-power RF amplifier. The PTCs are connected, one per pole, in shunt across each pole of the contactor. Alternatively, metallized film capacitors can be employed in lieu of the PTCs.

REFERENCES:
patent: 3935511 (1976-01-01), Boulanger et al.
patent: 4617533 (1986-10-01), Paulik
patent: 4621313 (1986-11-01), Kiteley
patent: 4730244 (1988-03-01), Zimmerman
patent: 4928218 (1990-05-01), Kluttz
Ellegard, K., "Inrush Current Limiter" Electronics World + Wireless World, Jul. 1994, p. 601.

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