Home / Brand Stories / TMEIC UPS Delivers Quality Power to Safeguard Critical Loads

In today’s world, equipment users in different regions face significant challenges to avail having clean, reliable, and uninterrupted power to their equipment. In many areas, they face power quality issues of power interruptions, voltage sag/swell, over/under voltage, power line noise, frequency variations, switching transients, harmonic distortion and phase imbalance, which affects the safe and continuous operation of their equipment and the process resulting in disruptions or stoppage of the work and the process that results in significant losses and wastage of expensive materials. In view of this, benefiting from a clean uninterrupted power supply to mitigate the abovementioned power quality issues is an important necessity.

TMEIC has been a pioneer in developing technologies and suitable uninterruptible power supply (UPS) products over the last 50 years (including the parent company’s contributions, prior to TMEIC JV formation) for the global market, which has resolved many of such power quality issues, and ensured reliable, clean power for many mission critical equipment, machineries, and appliances. TMEIC has been the leader in innovating technologies for UPS using the latest power semiconductors and circuit topologies. In 1964, TMEIC developed the SCR based UPS, which was upgraded to a transistor based UPS in 1982. With the entry of insulated-gate bipolar transistors (IGBTs), TMEIC developed the first IGBT based UPS in 1991. When IGBT technologies evolved further, to employ the carrier stored trench-gate bipolar transistor (CSTBT) IGBT, which was developed by Mitsubishi-Electric, in their semiconductor factory in Japan, TMEIC was the first to develop a new series of UPS using CSTBT. TMEIC has been the front runner in developing the world’s first multi-level power conversion topology in UPS.

TMEIC’s W250 and W350 series UPS systems with its very innovative 3 level pulse width modulation (PWM) converter and inverter combined with an advanced CSTBT, delivers industry-leading efficiency and also provides a unique reverse power flow feature for the UPS. This type of regenerative UPS resolved not just power quality issues, but also makes it the only suitable UPS for regenerative applications.

In today’s world of carbon neutrality targets, having the highest possible energy efficiency is very critical for every user of any power equipment. Thanks to advanced power circuit topology and the use of robust CSTBT IGBT as a power semiconductor, TMEIC’s Next Gen UPS achieved high double conversion efficiency up to 96.5% for the normal operating range as compared with any conventional UPS products.

High efficiency of TMEIC’s Next Gen W250 series UPS Graph 1 – Click here to view

High efficiency of TMEIC’s Next Gen W250 series UPS Graph 2 – Click here to view

TMEIC’s UPS systems are proved to be a game changer for the global market, which successfully mitigated all power quality issues, provides highly efficient double conversion (AC to DC and then DC to AC), along with the functionality of reverse power flow, which helped many critical applications. This power circuit topology is a transformerless design, which uses a 3 level PWM T type converter, a double DC-DC IGBT based chopper for battery charging, and 3 level PWM T type inverter. Coupled with the output LC filter, it provides a clear sinusoidal waveform at its output. Also, coupled with the input LCL filter, it mitigates the harmonics to meet IEEE519 specifications on powerline side harmonics.

TMEIC’s UPS with 3 Level PWM Converter & Inverter – Click here to view

For backup power, when the mains power fails, many types of batteries could be effectively interfaced with TMEIC’s Next Gen UPS very safely, as the charging current is almost ripple free due to a double DC-DC IGBT based chopper, as shown below. Standard lead acid batteries, VRLA, advanced VRLA batteries, nickel cadmium batteries, and recently, lithium ion batteries can be used with this TMEIC UPS, based on the user’s requirement of time of backup.

TMEIC’s UPS Systems using double DC-DC IGBT chopper for battery interface – Click here to view

TMEIC’s UPS is a true workhorse, in terms of overall product robustness, long life, and its flexible maintenance free design, and has demonstrated its strength and benefits globally for many users. As its output provides 3 phase 4 wire, it can be effectively used for 3 phase loads as well as single phase loads. Due to independent phase control, the TMEIC UPS allows up to 100% unbalanced loads at its output, which makes it very convenient to use across many applications.

The TMEIC UPS uses a powerful digital signal processor with an application specific integrated chip to deliver unrivalled performance in harsh electrical environments.

  • 3-phase independent control (100% unbalanced loads)
  • Feed forward control with characteristic current minor loop, useful in paralleled multiple UPS
  • Compatible with regenerative loads (reversed power flow)
  • High speed controller supports highly reliable multi-module system up to 8 UPS
  • Instantaneous Wave Form Control for both input current and output voltage

This gives superior performance and flexibility for this UPS in terms of:

  • Reduced output voltage fluctuation & distortion
  • Unbalanced load capability
  • Eliminating input current harmonics
  • Self-diagnostic function
  • MMS Capacity: Expandable and to protect up to 10.5MW
  • Cross current sensorless control
  • Instantaneous equal load sharing with current minor loopcontrol
  • Individual UPS modules can be added or isolated for expansion or maintenance

In today’s world of IOT and Industry 4.0, knowing your equipment’s overall performance is extremely critical and important. TMEIC’s UPS offers such multi-connectivity, for easy sharing of its data, using the RMS module, as shown in the figure below.

TMEIC’s UPS provides versatile remote connectivity – Click here to view

TMEIC, with its manufacturing complex comprising its green factories of electrical rotating machinery and power electronics located at Tumakuru near Bangalore in South India, manufactures UPS systems staring from 100kW to 1.75MW scalable up to 10.5MW with technology transfer from its Japanese works. Our Indian factory has carried significant localization and customization to meet the specifications of multiple industry segments. TMEIC offers UPS with batteries, battery monitoring or management systems and output side power distribution switchboards designed suitable for user’s requirements and specifications.

TMEIC’s manufacturing complex located at Tumakuru near Bangalore in South India
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TMEIC’s manufacturing complex located at Tumakuru near Bangalore in South India

Learn more about TMEIC India: Technology, Products and Automation Solutions for Industries Worldwide | TMEIC

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