| 摘要 |
An inverter for converting a DC voltage into an AC voltage comprising a full - bridge circuit having four silicon controlled rectifier (SCR) switches, two pulse control circuits for generating control voltage signals to turn on alternate pairs of said switches, a time sequencing circuit, and a power switch circuit. The full bridge circuit is directly connected to a positive DC input terminal and is coupled through the power switch circuit to a negative DC input terminal. The time sequencing circuit generates a first pulse signa l for controlling the first pulse control circuit and a second pulse signal fo r controlling the second pulse control circuit so that the first pulse signal and the second pulse signal are in phase opposition. The time sequencing circuit further generates an intermittent cycle pulse signal for turning the power switch circuit off during periods between a pulse of the first pulse signal and a pulse of the second pulse signal. The inverter according to the present invention may be of a size and weight which are compatible for use i n small type UPS systems, while still providing safe and reliable operation.</ SDOAB>
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