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Static Stabilizer


  • 1 Ph: 5KVA to 30KVA
  • 3Ph: 10KVA to 200KVA

Static Voltage Stabilizer is an IGBT based PWM type buck-boost voltage stabilizer which has tight regulation and fast correction speed which is impossible to obtain using conventional methods such as servo voltage stabilizers, SCR / triac type stabilizer, relay type stabilizer etc.

This is an SMPS type voltage stabilizer for mains voltage (AC input and AC output). This is a new switching topology where PWM is made directly in AC-to-AC switching, without any harmonic distortion. In this topology there is no need to convert the AC input to DC and again convert it back to regulated AC output. This simplifies the design, reduces the component count and improves the efficiency and reliability. The power stage is an IGBT chopper control. The chopping frequency is around 20KHz which ensures absolutely silent operation and pure sine wave output (no waveform distortion).

The control section is based on dsPIC controller which ensures quick correction of output which is not possible in conventional relay type stabilizer or servo controlled stabilizers. The circuit is having LCD for display which will show all parameters like: input voltage, output voltage, connected load, etc.

Since the circuit is fully solid state (no mechanical or moving parts) there will not be any wear and tear like the brush tear in servo stabilizer or relay degrading in relay based stabilizer.

This is specially useful in places where we need very fast correction speed, constant output voltage, overload current limiting and short circuit protection, soft start, high voltage cut-off and low voltage cut-off, automatic bypass, no wear and tear, long life and maintenance free which is impossible with other conventional relay type or servo control stabilizers.


WORKING In this IGBT based PWM type static voltage stabilizer only the difference voltage is switched through IGBT and will be added or subtracted from the mains. This is done electronically without any step changing in voltage which occurs when the system regulates. This is achieved by a feedback control system using digital signal processor (DSP). The output voltage is sensed by the DSP and corrections are made by varying the duty cycle of the PWM.

This stabilizer boosts up the voltage if it is low and bucks the voltage if it is high.

For example - If the AC input is 200V and the AC output is set for 220V, only 20V will be regulated through the IGBT and will be added to the original mains source which is 200V. If the AC input is 195V, then 25V will be added....

The efficiency in worst case will also be above 97%. This stabilizer is ideal for mobile towers, CNC machines, medical equipment, textile industries, power plants and any industrial product that needs tight regulation and fast correction. We can also use this for Air Conditioners, refrigerators, motor, pump etc

Highlights of QUIKorrect are -

  • Instantaneous correction speed - over 20000V per second
  • Discrete IGBT up to 30KVA single phase and 90KVA three phase
  • Single PCB for control stage, IGBT driver section and power stage.
  • Easy to assemble
  • Single contactor for three phase system
  • Single LCD for three phases
  • All protections included - low voltage, high voltage, overload and short circuit


The unique feature of this stabilizer is its correction speed which is very fast. If there is any change in the input voltage, it will be corrected i n the very next cycle.

  • Channel 1 (yellow) is the input waveform.
  • Channel 2 (blue) is the output waveform.

As we can see in the above waveform, input voltage (channel 1 –yellow) is dragged down from high voltage to low voltage within 0.2sec, but the output voltage (channel 2 –blue) remains steady.

Input voltage (channel 1 –yellow) is dragged up from low voltage to high voltage within 0.2sec, but the output voltage (channel 2 - blue) remains steady.

The input voltage (channel 1 –yellow) stepped down from high voltage to low voltage in no time, and the output voltage (channel 2 - blue) corrected immediately in the next cycle.


  • Direct AC-AC conversion without rectifying to DC improves the efficiency, reliability and reduces the components.
  • Rapid cycle by cycle correction of output. It can correct sudden fluctuation in the line voltage. For example using a welding machine in the same line will cause sudden fluctuation in the line voltage which can not be corrected with conventional relay type and servo controlled voltage stabilizers, where Static Voltage Stabilizer can correct it.
  • Output regulation of +/-1% which is impossible in conventional stabilizer.
  • No distortion in output waveform.
  • Overload cutoff and short circuit cut off
  • Over voltage and under voltage cutoff.
  • Automatic bypass incase of failure.
  • LCD display for displaying all parameters and your company name.
  • Compact size and light weight
  • 20KHz PWM control
  • IGBT power stage. Highly reliable.
  • Fully solid state. No moving part, hence more life and no maintenance.
  • Silent operation.


  • Over load and short circuit protection: It has overload/ short circuit current limiting and cut - off, the control part of the static stabilizer will sense the output current and if the load is more than the rated VA, for example: In a 3 KVA stabilizer, if you accidentally connect a load of 10KVA, it will limit the output current to the maximum output current at full load of the stabilizer.
  • High input voltage cut off : The high input voltage cut-off is set for 270V ( it can be set for some other voltage also ) up to 270V input, the output will be constant 220V. Because of this high voltage cut - off, the stabilizer itself will be protected from high voltage and the connected load is also safe.
  • Low voltage cut off : The low voltage cut off can be set at any value. For example – in a 180V to 260V model, the low voltage cut-off can be set at 180V or 170V or lower. Because of this low voltage cut off, the stabilizer is protected from low voltage malfunctioning.
  • Wear and tear : There is no wear and tear like the conventional stabilizer, as this stabilizer is fully solid state and there is no moving part. Because of this, there is no need of replacement of components even after certain period due to ageing. This eventually increases the reliability of the static stabilizer.
  • All the above protections and safety measures are not incorporated in the conventional stabilizers and that is what makes our differential power mode static stabilizer very reliable and unique.

IGBT Based Static Voltage Corrector Specification

Category Feature Three Phase Model
Electrical Capacity in KVA (KW) 20 KVA 30 KVA 40 KVA 50 KVA 60 KVA 80 KVA 100 KVA
Regulator High frequency 20 khz IGBT driven voltage regulation converter
Input Nominal Voltage Nominal Voltage volts ac, three phase
Normal operating voltage (Topical output within +1- 1% of nominal) 340 - 480 volts ac for full regulation
Relaxed operating voltage (relaxed output regulation within functional range of 200-250V P-N) 300 - 490 volts ac within maximum rated input current capacity
Nominal Frequency 47 - 63 Hz
Output *nominal voltage 415 Volts, Three Phase
Power Efficiency Typically over 97% (with 20-100% load conditions)
Voltage regulation +/- 1%
Maximum rated output current 27 A 40 A 54 A 67 A 80 A 107 A 134 A
Physical Dimensions (IN MM) 500 X 560 X 840 700 X 720 X 1000
20X4 LCD Display Digital Input, Output voltage & Load Current display
Mounting 4 High Quality Castor wheels
Envionmental ambient temperature 0° to +45° Centigrade (32° to 113° Farhenite). 10 to 90% RH non condensing
Cooling Method Fan Coiled & Air Coolled
Proactive Features OV/UV cut off with SPP Automatic trip in event of High / Low / Missing Voltage, Auto reset
Overload & Short Circuit Protection Through suitable rated input circuit braker & Output By Contactor
Soft Switch-On This feature ensure that output voltage is never higher than input voltage upon switch-on, before it commences full stabilization.
Automatic Bypass Automatic Bypass will be activated when there is a fault condition
Surge Protection By Input & Output Filter Card
Note All * marked voltage regulation ranges are based on 415V nominal output voltage. They would proportionately change in case nominal output voltage is required to be present at any other value between 380-415V.