A single phase uninterruptible power supply (UPS) has a single input and a single output source to support electrical equipment. Typically, a single phase UPS system will support electrical devices up to 20kVA. These can include network devices, IT equipment, telecoms systems and servers.
Single phase UPS solutions are used to provide essential backup power in the event of a power disturbance, anomaly or outages.
Some key characteristics of a single phase UPS system:
Single phase UPS: Single AC waveform
A single phase UPS operates using a single AC (alternating current) waveform, producing a single sinewave. A three phase UPS produces three separate sinewaves or AC waveforms. Hence the naming convention, single phase UPS and three phase UPS
What are the different types of single phase UPS available?
The least used type of single phase UPS is a standby or offline system. Also known as VFD (voltage and frequency dependent), this is where the load is powered straight from the single phase UPS input power. Offering the most basic level of backup power, a standby single phase UPS typically has a 4-8ms transfer time.
Line interactive single phase UPS solutions are much more common. Referred to as VI (voltage independent), these single phase UPS systems operate in a similar way to an offline single phase UPS but with the inclusion of an automatic voltage stabiliser (AVS). The AVS ensures single phase UPS systems are protected against power disruptions, such as sags and surges by ensuring the output voltage is within the identified voltage parameters.
Providing the most protective type of backup power for single phase UPS are online solutions. These clean mains power of any irregularities by converting AC power to direct current (DC) and then back to AC. An online single phase UPS will provide highest level of power protection.
Power Control offers a wide range of line interactive and online single phase UPS solutions.
What are the key components of a single phase UPS?
Single phase UPS systems have four main components. The most important is perhaps the UPS battery. These provide the emergency power source and will vary in autonomy depending on the UPS solution.
Another key aspect of a single phase UPS and indeed all UPS systems, is the rectifier which converts AC to DC current. This is then used to charge the UPS battery and power the inverter. The inverter converts DC to AC voltage and regulates the AC power .
The fourth component is a static bypass switch. Not all single phase UPS systems benefit from a static bypass switch but those that do can be in bypass mode and still power the load from the mains supply. This is often used in the event of a fault or during routine maintenance.
Can single phase UPS be monitored?
Absolutely! Most modern single phase UPS include monitoring solutions. Typically these allow users to monitor battery performance, UPS status and power quality. Monitoring solutions also often include alerts and alarms in the event of a fault or critical condition.
Single phase UPS solutions are incredibly versatile and are used to provide backup power to support both non essential and critical applications. For more information please contact us on 01246 431431