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Uninterruptible Power Supplies

A reliable source for Uninterruptible Power Supplies information and leading Uninterruptible Power Supplies Companies & Manufacturers.

An uninterruptible power supply (UPS), or uninterruptible power source, is an electrical device that provides emergency power to a load when the input power source or main power fails. It can also condition incoming power to prevent sensitive electronic equipment from being damaged by all-too-common sags and surges. Read More…

Uninterruptible Power Supplies Uninterrupted power supplies (UPS) are power supplies that continue to provide power during a loss of AC input power.
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Leading Manufacturers

National City, CA  |  800-275-5224

TDK-Lambda Americas designs and manufactures a wide range of AC-DC and DC-DC power supplies and EMI Filters for Medical, Telecom, Industrial, Datacom, and Test & Measurement applications worldwide. The company has been a major provider of power solutions since 1948. TDK-Lambda is a subsidiary of the TDK Corporation, a leading global electronics company.

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TDK-Lambda Americas Inc. $$$

Easton, PA  |  800-523-9478

For 4 decades, Acopian Power Supplies has specialized in long lasting power supplies (0 volts – 30000 V). We offer AC power supplies, DC power supplies, AC to DC converters, uninterruptible power supply (UPS), AC to DC power supplies & high voltage power supplies. With quality customer service & technical support, we have thousands of power supplies for thousands of applications.

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Acopian Power Supplies $$$

Hicksville, NY  |  516-935-2230

APS are specialists in power conversion and the manufacture of high performance power systems. Products include power converters and inverters; motor drives and brakes; battery chargers; AC and DC power supplies; driver circuits and more. Custom and standard power systems are available.

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Applied Power Systems, Inc. $$$

Perris, CA  |  951-277-0757

Our company offers a variety of standard and custom power supplies. These items are great for a wide range of applications. If you have any special requests then please let our representatives know. If you ever run into any questions or issues then our engineers are available to assist you. There is no project too challenging for our teams! Give us a call today!

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Triad Magnetics $$$

Livermore, CA  |  800-669-8090

At Quail Electronics, we are your power cord specialists. Our power supplies consist of green dot cords, high voltage cords, North American and international cords, specialty cords, plus adapters, plugs and strips.

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Quail Electronics, Inc. $$$
placeholder image TDK-Lambda Americas Inc. Acopian Power Supplies Applied Power Systems, Inc. Triad Magnetics Quail Electronics, Inc.


Types of Uninterruptible Power Supplies

The types of UPS include:

Single Conversion UPS System

These feed incoming utility AC power to IT devices in regular operation. If the AC input supply goes outside of established limitations, the UPS draws current from the battery and disconnects the AC input supply to prevent backfeed from the inverter to the utility.

The UPS operates on battery power until the AC is back on or the battery runs out of power. Standby and line-interactive are two of the most prevalent single-conversion designs.

Standby UPS

IT equipment can run on grid power until the UPS detects a problem, at which point it switches to battery power. Transformers or other devices are used in some standby UPS designs to offer limited power conditioning.

Internal Structure of Standby UPS

Line Interactive UPS System

A line interactive UPS has technology that allows it to adjust minor power fluctuations (undervoltages and overvoltages) without having to switch to battery power. An autotransformer in this sort of UPS manages low voltages (e.g., brownouts) and excess voltages (e.g., swells) without the need to switch to batteries.

Line Interactive UPS System

Double-Conversion UPS System

These gadgets, as their name implies, convert power twice. An input rectifier first converts AC electricity to DC, which is then sent into an output inverter. After that, the output inverter converts the power to AC before transmitting it to IT equipment.

This double-conversion technique isolates important loads from raw utility power, guaranteeing that IT equipment only receives sufficient and consistent power.

A double-conversion UPS continuously processes power twice in normal operation. However, if the AC input supply goes outside of predetermined limitations, the input rectifier turns off, and the output inverter starts drawing power from the battery.

Until the AC input returns to normal tolerances or the battery runs out of power, the UPS continues to operate on battery power. In the event of a severe inverter overload or a rectifier or inverter failure, the static switch bypass circuit is promptly turned on to support the output loads.

Circuit Diagram of Double-Conversion UPS System

Considerations When Choosing a UPS

The considerations when choosing a UPS include:

Topology of UPS

Single-conversion UPSs are more energy-efficient than double-conversion UPSs, but they provide less protection. As a result, they're well-suited to loads with a larger failure tolerance.

Standby UPSs (the most basic type of single conversion UPS) are typically the best option for smaller applications, such as desktop and point-of-sale solutions, whereas line-interactive UPSs are typically the best option for smaller server, storage, and network applications located in facilities with relatively trouble-free AC utility power.

Double-conversion UPSs are less efficient than single-conversion UPSs, but they are the typical choice for protecting mission-critical systems. Although multi-mode UPSs are more expensive than single or double-conversion systems, they are ideal for businesses looking for the finest combination of efficiency and protection.

Three-Phase or Single-Phase

When the utility creates electricity, it does so in three phases. Because commercial and industrial customers are often significant power consumers, this form of power is available to practically all of them.

Three-phase power makes use of three independent "phase" cables to deliver more power to a single point or load. Because most residences are tiny power users, most homeowners only have access to single-phase power.

Single-phase power is delivered via one or two phase wires that are obtained from a three-phase utility power system via transformers.

Single-phase UPSs are a practical and cost-effective solution for simpler, lower-kVA applications, such as those found in the home, small enterprises, and remote or satellite offices with processing capacity of less than 20,000 VA.

Large-kVA applications, which are frequently more sophisticated and have high compute density, are typically better served by three-phase UPSs.

Huge multi-story buildings, data centers, and industrial sites that need to distribute large amounts of power over relatively long distances are typical three-phase UPS customers.

Uninterruptible Power Supply Informational Video


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