Benoit Technologies

Online double conversion ups output isolation transformer based three phase

Output Isolation transformer-based UPS is most commonly used in all the critical applications where the load characteristics are non-linear, inrush, and high starting current. Any critical facility using this technology gives higher reliability and rigidness.
The UPS is connected between the three-phase input power and important loads (like computers) and offers quality three-phase power to the loads. It has the following features:

  • Full digitalized technology Dual-DSP control chip, advanced control technology, enhanced logic management and eliminated zero drift with analogue control; convenient use of modern control technology; convenient debugging, system update and maintenance; perfect logic functions; diverse interactive data for the customers; convenient communication and network functions
  • Highly reliable topological structure The rectifier adopts the most reliable thyristor phase-control technology; the inverter adopts an IGBT module half-wave structure, and the inverter transformer helps isolate the input and output electricity, which increases safety and shock resistance of the system; the battery is directly connected to the busbar, and the time for the electricity supply to be inverted into the battery is zero, which increases the reliability of the system; a static transfer switch controls the switching between inversion and bypass, and the switching time is as short as 0ms.
  • Outstanding input and output features
    The POWER WALK IN helps achieve gradual connection to the oil engine so as to prevent the unreliable start of the engine in the parallel operation system; generator power model; applicable in several voltage systems, i.e. 380V/400V/415V; 50HZ, 60HZ; meets most of the voltage systems in the world; high output power factor (0.9 lagging) which strengthens the systems load capacity and ensures sufficient overload capacity.
  • Smart Battery Management
    The automatic switch between equalizing charge and floating charge, prediction for the discharge time, and regular self-examination increase the service life of the battery.
  • N+X parallel operation mode
    It is convenient to achieve parallel operation. You only need to connect the parallel cables and set the UPS, and the host is automatically produced. In case the host breaks down, the slave automatically becomes the host, which increases the reliability of the system. The system can have at most 6 sets of UPS connected in parallel.
  • LBS synchronization
    LBS synchronization allows the system synchronization of two sets of UPS, which offers a technical guarantee for the dual-power system.
  • Perfect protection
    Over-voltage protection; over-frequency protection; over-current protection; over-voltage protection for busbar; over-temperature protection; fault protection for auxiliary power supply; output overload protection; output short-circuit protection; emergency power-off
  • Perfect monitoring
    Support RS232 and RS485, large LCD screen display; monitoring parts help monitor the working condition of UPS, give instructions, record fault time and other local monitoring functions, and also help achieve the communication between UPS lower machine and monitoring upper computer, and control the auxiliary system.

Design Concept

The operating principle of the stand-alone UPS. The first AC-DC conversion adopts a three-phase full-wave rectifier to convert the three-phase AC input voltage into the steady DC bus voltage.

The rectifier can also be used as a charger. The inverter takes the IGBT half-wave circuit as its inversion topology. The advanced Space Vector Pulse Width Modulation (SVPWM) is used to control the system, which inverts the DC bus voltage into AC voltage output. When the AC is normal, the rectifier and the inverter work at the same time and simultaneously charge the battery. In case of abnormal AC, the rectifier stops working, and the battery supplies power via the inverter. If the battery voltage drops below the cutoff voltage and the AC is not yet back to normal, the UPS shuts down. (If the major circuit and the bypass circuit are not of the same source and the bypass circuit is normal, the system is powered by the bypass circuit). The cutoff voltage is preset (e.g. the factory setting is 1.67V, and the battery cutoff voltage is 320Vdc). In case of abnormal AC, the battery powers the UPS until its voltage drops to the cutoff voltage. This period is called the “backup time”, the length of which depends on the battery’s capacity and the loads.

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