UPS power supply modes and advantages

Traditional data communication equipment requires AC input power, which is generally a power supply with the same voltage and frequency as the mains power supply, that is, a single-phase AC power supply of 220V, 50Hz. The power supply system of traditional data communication equipment is a UPS system. The UPS system is generally composed of a rectifier, an inverter, a battery, and a static switch. When the mains power is normal, the mains power is converted into DC power by the rectifier to supply the inverter, while charging the battery. The inverter converts the DC power into AC power to supply the load. When the UPS itself fails, the load can be converted to bypass the mains power supply through the static switch. When the mains power is off for a long time, the backup generator set will supply power.

Although the equipment in the IDC room is powered by single-phase power, the power is getting bigger and bigger. The power of single-phase UPS cannot be very large and is limited. The solution is to use three-phase UPS power supply. The power is generally evenly distributed to three phases, and the UPS is connected in parallel to ensure the reliability of power supply. Since the UPS ultimately supplies power to the data equipment through inversion, if the inversion and switching part fails, the battery will not directly supply power to the data equipment, which will cause data equipment interruption.

Several common UPS power supply modes

1. Series hot backup

This UPS power supply method eliminates single point failures and is simple to implement. However, only one UPS is loaded at a time, so there are problems such as poor overload capacity and uneven aging of the main and standby machines. It is rarely used now.

2. Parallel redundancy

The biggest advantage of this UPS power supply mode is that it can evenly distribute the load. If any UPS fails, it will be disconnected, and the UPS system can still work in online mode without any switching. The system capacity can be expanded by adding UPS according to the load.

3. Dual bus power supply mode

The biggest feature of this UPS power supply mode is that it provides two power supply buses that do not affect each other at the same time, which are provided to dual power loads respectively, or provided to single power loads through STS. This method also eliminates single point failures very well, but due to the addition of LBS (synchronous control) and STS (dual-way switching) in the power supply solution, it also increases the failure points.

Advantages of UPS power supply solution:

The technical solution is mature and is currently being widely used.

AC output, not easy to arc.

Disadvantages of UPS power supply solution:

It is difficult to connect the machines in parallel, as voltage, frequency and phase synchronization are required.

· Complicated system design, multiple single-point failures

Many transformation stages , relatively low efficiency

Large input harmonics and low power factor