Application of IGBT short circuit detection in modular UPS system

In the modular UPS system, when a power module of the system fails, the failure module need to exit the system timely, in order to reduce the influence of the fault module on the modular UPS system, so as to ensure the stability of output voltage.

SOROTEC in the development process of modular UPS solutions, carried out a variety of single fault test, in order to ensure the UPS power module in a single fault, to ensure the stable operation of modular UPS system. The single fault of inverter IGBT is a big challenge to the stability of UPS system.

The operating state of the modular UPS system with only 1 power module in the inverter IGBT short circuit
When only one power module is inserted into the modular UPS cabinet, as the power module of IGBT inverter is short circuited, the output voltage and current are decreased, the power module to determine inverter fault, intermittent switch to bypass power supply, the output go stably. The output interrupt time in this process is less than 20ms.

The operating state of the modular UPS system with 2 power modules in the inverter IGBT short circuit
When 2 power modules is inserted into the modular UPS cabinet, as the short circuit of one of the IGBT inverter power modules occurs, the other power module output current into the fault power module, and its current power module output energy is limited, can not fuse the output of the fault module. Until the fault module detects the inverter fault and exit the system, the system has a certain risk of intermittent cut bypass power supply, the output interrupt time in this process is less than 20ms.

SOROTEC MPS9335C 10-300KVA Modular UPS with IGBT short circuit detection

Model: 10-1200KVA
Nominal voltage: 380/400/415VAC
Output power factor: 1
MPS9335C series Modular type UPS is modular online UPS for sensitive equipments. The single cabinet power rating covers from 10KVA to 300KVA which delivers the best of combination of reliability, hot-swappable and flexibility. With the latest IGBT three-level technology and DPS control, MPS9335C achieves a high input power factor, low THDi Modular design with N+X redundancy and online hot swapping, easy to expand the capacity Full DSP control of high stability, reliability and safety Integrated IGBT module with improved performance and reduced size.

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