Browse Prior Art Database

Stacked Inverter Power Supply

IP.com Disclosure Number: IPCOM000088471D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Allen, GW: AUTHOR [+4]

Abstract

Inverters of the kind described in the preceding article can be operated in parallel to supply heavier loads.

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Stacked Inverter Power Supply

Inverters of the kind described in the preceding article can be operated in parallel to supply heavier loads.

Fig. 1 shows identical inverters IA, IB, IC and ID connected in parallel across V(OUT) terminals to supply an AC load. They may share a single pair of batteries +E, -E, or have separate sources. Each inverter has a current sense output 10, 12, 14, 16 indicating the current flow through its filter inductor, and these current sense signals are fed to control 18 to activate the inverters, in order, as they successively reach their individual current ratings. Thus, for a very low load, inverter IA may have sufficient current capability to supply the entire load demand. However, if it reaches its maximum current rating during a half cycle, control 18 will activate another inverter such as IB to start contributing current to continue development of the sinusoidal output defined by reference 20, while the output of inverter IA is maintained constant.

Assume that the current capacity of IA and IB together are sufficient to supply the load. In this case, IA furnishes the base part of each halfwave and IB furnishes the peak, When IB follows the sinusoidal reference downwardly until IB is yielding zero current, control 18 deactivates IB and returns control to IA for completion of the first half wave of the sinusoid, and so on.

Desirably, control 18 precesses the operation of the inverters each new sinusoidal cycle so that, for the next...