United States Patent [19] [li] Patent Number: 4,719,550
Powell et al. [45] Date of Patent: Jan. 12, 1988
[54] UNINTERRUPTIBLE POWER SUPPLY WITH ENERGY CONVERSION AND ENHANCEMENT
[75] Inventors: Jeffrey M. Powell, Galena; Don A.
Gephart, Delaware, both of Ohio
[73] Assignee: Liebert Corporation, Delaware, Ohio
[21] Appl. No.: 906,176
[22] Filed: Sep. 11,1986
[51] Int. CI.4 H02M 5/45
[52] U.S. a 363/37; 307/46;
307/48; 307/66
[58] Field of Search 307/46, 48, 66; 363/37
[56] References Cited
U.S. PATENT DOCUMENTS
3,771,012 11/1973 Niederjohn 307/66
3,836,815 9/1974 Herzog 307/66
3,925,772 12/1975 Miller et al 307/66
4,246,633 1/1981 Borkovitz 307/66
4,277,728 7/1981 Stevens 363/37
4,313,060 1/1982 Fickenscher et al 307/66
4,315,163 2/1982 Bienville 307/66
4,340,823 7/1982 Miyazawa 307/66
4,401,895 8/1983 Patkovsek 307/66
4,475,047 10/1984 Ebert 307/66
4,488,057 12/1984 Clarke 307/66
4,554,999 11/1985 Kamaike 307/66
4,562,357 12/1985 Miyazawa 307/66
4,634,888 1/1987 Deavenport 307/48
OTHER PUBLICATIONS
Cocconi et al.; "High-Frequency Isolated 4 kW Photovoltaic Inverter for Utility Interface"; Power Conversion International; May 1984, pp. 26-48.
Primary Examiner—Patrick R. Sake
Assistant Examiner—Jeffrey Starrett
Attorney, Agent, or Firm—Mueller and Smith
[57] ABSTRACT
A power supply control is disclosed which performs in conjunction with an a.c. source as may be provided by a utility line input. This line input is directed through a converter which reflects or mirrors an a.c. signal into the line input mimicing it in all aspects except that of amplitude. The opposite side of the bi-directional device is coupled to a node connection which further is coupled to an energy reservoir present as a rechargeable storage battery. An output converter device serves to develop a desired a.c. output employing the energy at the node connection. Energy transfer into the node is provided by controlling the amplitude of the input converter such that it is slightly less than that of the input utility. The apparatus is modular in design such that it may assume a variety of configurations employing either a.c. or d.c. node connections.
19 Claims, 15 Drawing Figures
