An Energy Injection Circuit for AC Power Continuity Device.

摘要

NCEL previously investigated the use of an L-C tank circuit as a redundant power source for supplying continuous power during momentary interruptions of the primary power source,lasting 100milliseconds or less (See AD-716 409). Results of this investigation showed that the tank circuit has an inherently high power loss. Further,the amount of energy that can be stored in the tank circuit is limited by the physical size of the tank circuit components. In an effort to reduce the size of the tank circuit components,an energy injection circuit was investigated. An experimental, 1KW, 100volt, 60Hz model of the circuit was developed and evaluated by NCEL. The model consisted of a source disconnect switch,tuned L-C series circuit,an L-C tank circuit,and logic circuits. Two advantages of the energy injection circuit were noted as a result of Laboratory tests. (1) The size of the L-C tank circuit components can be optimized by supplementing the stored energy requirements with a redundant DC power source provided with the energy injection circuit,and (2) the power output could be sustained for longer periods during interruptions of the normal power sources,limited only by the capacity of the DC power source in the injection circuit. It was concluded that the energy injection circuit can only be considered as a low level power continuity device for loads of less than 50 KVA. (Author)