UPS 是不间断电源的英文缩写。它有内置电池，可在电网异常的情况下不间断地为电器等负载设备提供后备交流电源，维持电器正常运作。

The abbreviation of the UPS is the Uninterruptable Power Supply. It has built-in battery, which can continuously provide backup AC power supply for load equipment such as electrical appliances in case of abnormal power grid, so as to maintain the normal operation of electrical appliances.

后备式UPS在市电正常时直接由市电向负载供电。当市电超出其工作范围或停电时通过转换开关转为电池逆变供电。

When the mains supply is normal, the backup ups will directly supply power to the load from the mains supply. When the mains supply exceeds its working range or power failure, it will be converted to battery inverter power supply through the change-over switch.

在线式UPS在市电正常时，由市电进行整流提供直流电压给逆变器工作,由逆变器向负载提供交流电。在市电异常时，逆变器由电池提供能量，逆变器始终处于工作状态，保证无间断输出。

When the mains supply of online UPS is normal, the mains supply rectifies to provide DC voltage to the inverter, and the inverter provides AC to the load. When the mains supply is abnormal, the inverter is powered by the battery, and the inverter is always in working state to ensure uninterrupted output.

逆变器是一种将直流电变为交流电的仪器。它不产生电力，电源由电池提供。逆变器的输入电压是恒定的直流电源，其输出可以是方波或正弦波，这取决于逆变器的电路和设计。逆变器输出波的频率保持与标准频率相同，即50或60赫兹。

The inverter is an electronic circuit that changes the DC to AC. It does not generate electric power; the power is supplied from the battery. The input voltage of the inverter is the constant DC power source, and their output may be square, sine or pulse sine wave depends on the circuit and design of the inverter. The frequency of the output wave of the inverter remains same as that of the standard frequency, i.e., the 50 or 60 Hertz.

对比图

Comparison Chart