Online UPS

Products and reference designs for modern online UPS systems

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Overview

Given the enormous energy consumption in today's world - due to the rapid growth of connected devices (IoT) and smart industry processes - it is essential to develop more energy-efficient and cost-effective power supplies, especially when it comes to uninterruptible power supplies (UPS). Online UPS systems provide uninterrupted power to critical loads that require the highest level of protection.

Benefits

  • High reliability
  • Zero downtime
  • Scalability
  • Low cost
  • Minimized carbon footprint
  • Energy efficient

Block diagram

About

Highest protection levels with double conversion

The required level of protection is achieved through double conversion. Double conversion means that the power is converted twice: In normal operation, a rectifier converts the input power from AC to DC and feeds it to an output inverter. The output inverter then converts the power back to AC. Since the UPS essentially decouples the load from the grid, it ensures voltage and frequency stability. In case of grid failure, it provides instantaneous back-up power via the battery until a generator set is brought online. Various bypass structures allow for maintenance during operation, improve overload capability, or provide significant loss reduction.

Modularity improves reliability, scalability, and carbon footprint

The key requirements for modern UPS systems are not only high reliability and zero downtime, but also scalability and efficiency. While scalability is essential to meet future energy demands, high conversion efficiency minimizes both carbon footprint and the cost of ownership.

Modularity has a positive effect on all these aspects. Take the power stage as an example: A modular 75 kVA UPS system could consist of three units with 25 kVA each. Such a system improves reliability and uptime through fast service and N+1 redundancy. It is also inherently scalable and can optimize conversion efficiency through intelligent load sharing. Note that modularity is not limited to the power stage. Other components such as the batteries or the UPS controller also benefit from a modular design.

Product offering for online UPS

We offer a broad portfolio of discrete and module-based power semiconductors, gate drivers, current sensors, and controllers. Power stage designs that use discrete devices are often based on three-level topologies: Vienna rectifier implementations contain 1200 V CoolSiC™ diodes combined with CoolMOS™ super junction MOSFETs or TRENCHSTOP™ 5 IGBTs, inverters and battery chargers are commonly implemented using TRENCHSTOP™ 5 and High Speed 3 IGBTs, as well as CoolSiC™ Hybrid Discretes or CoolSiC™ MOSFETs.

Isolated gate drivers of the EiceDRIVER™ Compact family are well suited for the application in multi-level topologies and are compatible with all of the above mentioned power semiconductors. XENSIV™ current sensors, potentially combined with XMC™ and AURIX™ microcontrollers enable high-precision control.

More about power solutions
More about microcontrollers
More about sensors

Highest protection levels with double conversion

The required level of protection is achieved through double conversion. Double conversion means that the power is converted twice: In normal operation, a rectifier converts the input power from AC to DC and feeds it to an output inverter. The output inverter then converts the power back to AC. Since the UPS essentially decouples the load from the grid, it ensures voltage and frequency stability. In case of grid failure, it provides instantaneous back-up power via the battery until a generator set is brought online. Various bypass structures allow for maintenance during operation, improve overload capability, or provide significant loss reduction.

Modularity improves reliability, scalability, and carbon footprint

The key requirements for modern UPS systems are not only high reliability and zero downtime, but also scalability and efficiency. While scalability is essential to meet future energy demands, high conversion efficiency minimizes both carbon footprint and the cost of ownership.

Modularity has a positive effect on all these aspects. Take the power stage as an example: A modular 75 kVA UPS system could consist of three units with 25 kVA each. Such a system improves reliability and uptime through fast service and N+1 redundancy. It is also inherently scalable and can optimize conversion efficiency through intelligent load sharing. Note that modularity is not limited to the power stage. Other components such as the batteries or the UPS controller also benefit from a modular design.

Product offering for online UPS

We offer a broad portfolio of discrete and module-based power semiconductors, gate drivers, current sensors, and controllers. Power stage designs that use discrete devices are often based on three-level topologies: Vienna rectifier implementations contain 1200 V CoolSiC™ diodes combined with CoolMOS™ super junction MOSFETs or TRENCHSTOP™ 5 IGBTs, inverters and battery chargers are commonly implemented using TRENCHSTOP™ 5 and High Speed 3 IGBTs, as well as CoolSiC™ Hybrid Discretes or CoolSiC™ MOSFETs.

Isolated gate drivers of the EiceDRIVER™ Compact family are well suited for the application in multi-level topologies and are compatible with all of the above mentioned power semiconductors. XENSIV™ current sensors, potentially combined with XMC™ and AURIX™ microcontrollers enable high-precision control.

More about power solutions
More about microcontrollers
More about sensors

Design resources

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