2 Overview
MR33 Series (75K-600K) Modular UPS
User Manual
10
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2.3 Work Principle
2.3.1 Work Principle Diagram
Work principle diagram of the UPS is as shown in Figure2-1.
AC
DC
DC
AC
DC
DC
Maintenance bypass
Bypass input
Mains input
Battery input
Bypass module
Power module 1
AC
DC
DC
AC
DC
DC
Power module N
Output
Figure2-1
Work principle diagram
2.3.2 Work Mode
There are 4 work modes of the MR series modular UPS: normal mains power supply mode, battery
power supply mode, bypass power supply mode and maintenance bypass power supply mode.
Normal mains power supply mode
When the mains normal, AC power is transformed to DC power by PFC, and supply power for
inverter. While rectifying the AC power into DC power, the rectifier eliminates the abnormal noise
wave, noise and unstable frequency, and make the inverter provide stable and clean power for load.
The specific work process is as follows.
When mains normal, the rectifier, inside the power unit, rectify the mains into anode and cathode DC
voltage, and store energy in DC electrolysis for inverter to use. The inverter absorbs energy from DC
electrolysis and inverts to output stable 220Vac voltage. When the system detects the inverter normal,
it will supply the inverting voltage to load.
Summary of Contents for MR33 Series
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