恒压、恒流供电，降低衰减。
Powered by constant voltage and current to reduce LED degradation.
第三章重点讲的是恒流ups在市电出现故障时如何实现恒流不间断供电的。
Chapter Three explains how the UPS with constant current supply the power, as the electric power is not available.
构成了电容降压式恒流充电器，达到了完全自动不间断供电。
Thus a constant electric charger of the step-down condenser type is constructed, resulting in a fully automatic continuous power. supply.
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