Modular DIN-rail UPS uses LiFePO4 or supercap power

December 20, 2018 // By Nick Flaherty
 Modular DIN-rail UPS uses LiFePO4 or supercap power
Bicker Elektronik in Donauwoerth, Germany, has launched a DIN-rail uninterruptible 12V and 24V DC power supply for fail-safe designs.

The UPSI system provides effective protection against power outages, flicker, fluctuations or voltage dips in the DC power supply, eliminating costly plant or system downtime. The compact DIN rail version UPSI-XXXXD with robust aluminum housing is equipped with an universal DIN rail mounting system for quick and flexible installation in control cabinets. Separate DIN rail energy storage units with particularly long-lasting and safe LiFePO4 battery cells (lithium iron phosphate) as well as maintenance-free ultracapacitors are available.

It is aimed at a wide range of applications, such as monitoring and controls technology, automation, Industry 4.0 / IIoT, motor drives, sensors, camera and security systems, industrial PCs, gateways and more.

Into the compact control and charging modules Bicker UPSI-1208D (12VDC) and Bicker UPSI-2406D(24VDC), a bidirectional buck-boost converter was implemented as a central element for the charging and discharging process of the connected energy packs to ensure a very efficient and safe operation. In order to use the UPSI system with different battery chemistries, three charging methods with individual end-of-charge voltage adjustments are implemented: Constant Current, Constant Voltage and Constant Power.

The charging and control module is connected to the respective energy storage via two lines. In addition to the energy transmission line (BAT PWR), all relevant operating data of the energy storage device are continuously monitored and controlled on the data line (BAT DATA) via I2C interface. When changing the energy storage, which is possible even during operation (hot-swapping), a battery type ID authentication is performed so that the appropriate charging and discharging parameters can be automatically set on the DC-UPS. The intelligent PowerSharing function on the input side ensures that the upstream AC/DC power supply does not have to be oversized, but the input power is kept constant and distributed accordingly to load and charger. In other words, with low load at the output, more energy flows into the charger and vice versa.

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