Rectifier (English: Rectifier) is a device that converts alternating current into direct current. It can be used for power supply devices and detecting radio signals. Rectifiers can be made of vacuum tubes, pilot tubes, solid-state silicon semiconductor diodes, mercury arcs, etc. On the contrary, a device that converts direct current into alternating current is called "inverter".
In the standby UPS, only the battery needs to be charged, and there is no need to supply power to the load, so there is only a charger. In the dual conversion UPS, this device not only supplies power to the inverter, but also charges the battery, so it is called rectifier / charger.
Rectifier is a rectifier device, which is simply a device that converts alternating current (AC) into direct current (DC). It has two main functions: first, it turns alternating current (AC) into direct current (DC) and supplies the load or inverter after filtering; Second, provide charging voltage to the battery. Therefore, it also acts as a charger.