Four ways of working with UPS power

UPS power supply is a relatively common emergency power supply system. It works differently in the case of normal utility power and abnormal utility power. This paper mainly introduces four working modes of UPS power supply: normal operation, battery operation, bypass operation. And bypass maintenance.

1, normal operation mode

The power supply principle of the UPS power system is that when the utility power is normal, the machine converts the AC power of the mains into DC power, and then charges the battery for use when the power is interrupted. It should be emphasized that the uninterruptible power system is not powered off. Work, such as when the voltage is too low or too high, an instantaneous surge, etc., enough to affect the power quality of the normal operation of the equipment, the UPS system is in working condition, providing stable and clean power for the load equipment.

2, bypass operation mode

When the online UPS emergency power supply is overloaded, bypass command (manual or automatic), inverter overheating or machine failure, the UPS power supply generally converts the inverter output to bypass output, that is, direct power supply from the mains. Because of the bypass, the UPS output frequency phase needs to be the same as the mains frequency phase. Therefore, the phase-locked synchronization technology is used to ensure that the UPS power output is synchronized with the mains. Bypass switch bidirectional thyristor parallel working mode solves the problem of bypass switching time, truly zero-time switching, and the control circuit is complex, generally applied to medium and large power UPS power supply. If the UPS is overloaded, the load must be artificially reduced, otherwise the bypass breaker will automatically cut off the output.

3, battery working mode

When the utility power is abnormal, the DC power stored in the battery is converted into AC power. At this time, the input of the inverter is supplied by the battery pack, and the inverter continuously supplies power, and the supply load continues to be used to achieve the continuous power supply function. The power source of the UPS power system is the battery, and the capacity of the battery is limited. Therefore, the UPS system does not continuously supply power like the city power, so no matter how large the capacity of the uninterruptible power system, in its fully loaded state, its location The power supply time must be limited. To extend the discharge time, you must purchase a long-delay UPS power supply.

4, bypass maintenance mode

When the UPS power supply is being repaired, the normal power supply of the load equipment is ensured by manually setting the bypass. When the maintenance operation is completed, the UPS power supply is restarted, and the UPS power supply is turned into normal operation.