Browse Prior Art Database

Buffered Power System

IP.com Disclosure Number: IPCOM000078485D
Original Publication Date: 1973-Jan-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Kohlrausch, WF: AUTHOR [+2]

Abstract

This power system is especially adaptable to small load requirements. The AC to DC converter requires only coarse regulation and the batteries are normally idle at a lower voltage level and, therefore, require only a trickle charger. Use of parallel sine-wave ferroresonant transformers in the output provide short-circuit current limitation and load current inrush surge averaging, whereby the inverter is protected.

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Buffered Power System

This power system is especially adaptable to small load requirements. The AC to DC converter requires only coarse regulation and the batteries are normally idle at a lower voltage level and, therefore, require only a trickle charger. Use of parallel sine-wave ferroresonant transformers in the output provide short-circuit current limitation and load current inrush surge averaging, whereby the inverter is protected.

With batteries disconnected, the supply will filter out all over-voltages and buffer undervoltages to a certain degree. With batteries connected, it will buffer all undervoltages including outages. The duration of outage to be buffered is determined by the battery rating, only.

The AC line ieeds a ferroregulated DC power supply 1, which supplies MAIN and LOGIC voltages. In parallel, a trickle charger 2 maintains charge of the storage batteries 3. Both sources decoupled by rectifier 4 feed a DC storage capacitor bank 5. The voltage levels are chosen in such a way that the battery does not supply any power during normal operation.

A self-commutating DC to AC inverter 6 is oscillator controlled 7. A thyristor inverter in bridge configuration provides AC power to one or several harmonic neutralized ferroresonant regulators 8. The resonant frequency of the commutate circuit of the inverter is chosen to be 1.5 to 2 times the output frequency to guarantee self-commutation. Although the inverter output varies in amplitude and distortion, t...