![]() ![]() Some line interactive UPS can have extended backup times using external plug-in battery packs. Line interactive UPS are more commonly used smaller IT loads and network devices. The components in an IT power supply may be more stressed by the less conditioned output of a line interactive UPS (than an online one) but the real weakness of a line interactive UPS is its lack of an automatic bypass and inability to fail safely to mains if there is a UPS overload or fault condition. Most IT loads can tolerate the break in supply and waveform due to the design of their switch mode power supplies (SMPS) which include their own capacitance (ability to store energy for a short period measured in milliseconds. The switching in time may be from 2-4milliseconds and the inverter output waveform from the inverter may be a sinewave or in lower cost models a square wave (referred to as a pseudo sinewave) or step-wave. The inverter ‘switches’ in when the mains power supply fails or fluctuates outside the operating range of the AVR. ![]() The battery is charged by a circuit connected to the input AVR and an inverter is live but not powering the load directly. The UPS has an automatic voltage regulator (AVR) to which the load is connected and supplied a stabilised and filter AC waveform. Line interactive UPS systems: the next step down in uninterruptible power and typical available from 300VA to 3kVA, single phase.As the UPS inverter is designed for constant running, this type of UPS is commonly used for extended runtimes using plug-in or hardwired external battery extension packs. Typical sizes range from 500VA to 1MVA, single and three phase UPS, monoblock and modular UPS types. The UPS output is ‘no-break’ maintained by the seamless transfer between DC power sources (input rectifier output or battery) and the internal capacitance of the UPS system. An automatic transfer switch (relay or static based) monitors the output from the inverter and automatically transfers the load to the raw mains power supply if the inverter output sine wave collapses during an UPS overload, short-circuit or fault condition. The inverter is constantly running and powering the load using either a rectified mains power or generator supply or connected battery set. Online UPS systems: Provides the most secure form of uninterruptible power when mains power is available and when there is a power outage.The three types of uninterruptible power supply include: What Is an Uninterruptible Power Supply?Īlmost everyone knows that UPS systems provide battery backup however, few are aware of the three major types of UPS systems. Your choice often depends on your budget, availability, and application needs. Whilst lithium-ion battery packs offer longer working lives, lead acid are more cost-effective and to a wider degree more environmentally friendly. How do you decide between traditional lead-acid batteries and the latest lithium-ion battery backup solutions when selecting a UPS system for your server room or other critical IT applications? ![]()
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