Power supply with improved circuit for harmonic paralleling

Details Power supply with improved circuit for harmonic paralleling Power supply with improved circuit for harmonic paralleling

1992-09-24

1995-07-25

Deboer, Todd

Electrical transmission or interconnection systems

Plural supply circuits or sources

Load current control

307 20, 307105, 363 41, 363 71, H02J 306, H02J 346

Patent

active

054365120

ABSTRACT:
A UPS device adapted for parallel connection to a load along with one or more other UPS devices, having circuitry for sharing of the load, including load harmonics. A feedback network has an error signal circuit which generates an error signal representative of the difference between the actual current provided by the device and the designated share of current it should provide. The error signal is transformed by a value representative of the effective output impedance of the UPS inverter, whereby the inverter is controlled to share the fundamental of the load current as well as the harmonics.

REFERENCES:
patent: 3621365 (1971-11-01), Beck et al.
patent: 3675037 (1972-07-01), Hamilton
patent: 4114048 (1978-09-01), Hull et al.
patent: 4276590 (1981-06-01), Hansel et al.
patent: 4609828 (1986-09-01), Small
patent: 4733341 (1988-03-01), Miyazawa
patent: 4748340 (1988-05-01), Schmidt
patent: 4835411 (1989-05-01), Takeda
patent: 5177676 (1993-01-01), Inam et al.
patent: 5257180 (1993-10-01), Sashida et al.

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