I. Redundant Power Supply
Redundant power supplies are used to achieve high availability for server systems. Besides servers, disk array systems are also widely used.
RPS (Redundant Power System) power supplies are used as external DC power supplies for some switches.
RPS can be used as a redundant backup power source for switches or routers:
If the RPS and the powered equipment use the same AC power supply system, when the power supply inside the powered equipment is abnormal, the RPS can continue to provide DC power to the faulty equipment, ensuring the continuous normal operation of the equipment;
If the RPS and the receiving equipment use different AC power supply systems, DC power can continue to be provided when the external AC power supply to the receiving equipment fails, ensuring the continuous normal operation of the equipment.
II. UPS Power Supply
A UPS, or Uninterruptible Power Supply, is a system that connects a battery (usually a lead-acid maintenance-free battery) to a main unit, and uses the main unit's inverter and other circuit modules to convert DC power into AC power. It is primarily used to provide a stable and uninterrupted power supply to single computers, computer network systems, or other power electronic equipment such as solenoid valves and pressure transmitters. When the mains input is normal, the UPS stabilizes the mains power and supplies it to the load; in this state, the UPS acts as an AC voltage regulator, while simultaneously charging its internal battery. When the mains power is interrupted (power outage), the UPS immediately switches from the battery's DC power to the load via an inverter, continuing to supply 220V AC power, ensuring the load continues to operate normally and protecting the load's hardware and software from damage. UPS devices typically provide protection against both overvoltage and undervoltage.
UPS (Uninterruptible Power Supply) is a third-generation, fully online, intelligent UPS developed using cutting-edge digital technology. It addresses the reliability requirements of China's power grid environment and network monitoring and systems, as well as medical systems. It overcomes the increasingly harsh power grid environment caused by centralized power supply for medium and large-scale computer network systems. A DC power supply is a device that maintains a constant current in a circuit. Examples include dry cell batteries, storage batteries, and DC generators.
UPS and DC power supplies are crucial power supply backup equipment for enterprises. Traditional maintenance management includes: ① routine visual inspections, periodic replacement of easily damaged parts such as batteries, filter capacitors, and fans, and battery activation during major overhauls; ② upgrading or replacing equipment, and using advanced tools to test battery performance. This management approach incurs high costs for enterprises, imposes a heavy workload on maintenance personnel, makes it difficult to monitor equipment operating status and key data in real time, and has low equipment failure prevention capabilities. Implementing online maintenance management can avoid the shortcomings of traditional methods and achieve significant benefits.
UPS stands for "Uninterruptible Power System/Uninterruptible Power Supply". It ensures that a computer system continues to work for a period of time after a power outage, allowing users to save their work in an emergency and preventing them from losing data or being affected by the power outage.
III. Differences between Redundant Power Supplies and UPS Power Supplies
Power supply redundancy can be achieved through various methods, including capacity redundancy, cold backup, N+1 backup with parallel current sharing, and hot backup. Capacity redundancy refers to a power supply's maximum load capacity exceeding the load, but this has little effect on improving reliability.
Redundant cold backup refers to a power supply composed of multiple functional modules. Normally, one module powers the system, and when that module fails, the backup module immediately starts operating. The disadvantage of this method is that there is a time interval between power switching events, resulting in voltage gaps.
Parallel current sharing N+1 backup refers to a power supply consisting of multiple units connected in parallel via OR gate diodes, with each unit supplying power to the device. This scheme ensures that the load is not affected by the failure of one power supply, but a short circuit at the load end will affect the units. Redundant hot backup refers to a power supply consisting of multiple units, all of which are operational, but only one unit supplies power to the device, while the others are idle. In the event of a main power supply failure, the backup power supply can be immediately activated with minimal output voltage fluctuation.
For systems requiring long-term, uninterrupted operation and high reliability, such as base station communication equipment, mobile devices, and servers, a highly reliable power supply is often essential. Redundant power supply design is a crucial component and plays a vital role in such systems. A redundant power supply is configured with two power sources. When one power source fails, the other can immediately take over, ensuring uninterrupted operation of the equipment. This is similar to the working principle of a UPS (Uninterruptible Power Supply): when the mains power fails, batteries provide backup power. The main difference between a redundant power supply and a UPS is that they are powered by different sources, while a UPS uses one power source while the other is always on standby and may automatically switch between them.
