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Static Voltage Stabilizer

The static stabilizer offers a reasonable improvement on slow servo controlled stabilizer as well as other static tap changing stabilizers. This technology does not cause di/dt problems as it does not switch the power path. The basic topology is with buck-boost transformer with high primary to secondary ratio for voltage correction of ± 25%. The control voltage is imposed on the primary of this buck-boost transformer. The voltage regulation with help of buck and boost topology is achieved electronically without the step changes in voltage that occur when the system regulates. This task is accomplished through a feedback and a control system implemented by using a microcontroller. The system uses IGBTs as power switches. Direct AC-AC converter circuit improve the overall system response and fast voltage correction. No storage capacitor increase life of the system. 20Khz PWM control operation using high end dsPIC controller to achieve correction time of 1 to 1.5 cycle. Excellent performance in voltage sensitive application.


  • Very fast correction time of 20-30ms.
  • Excellent voltage regulation of +/- 1%.
  • Short circuit protection is provided.
  • To protect IGBT/System from overheat, thermal protection is provided.
  • To protect the system from the input voltage surges class c (Class II) surge suppressor is provided.
  • Unique auto bypass feature allows loads to remain connected beyond nominal voltage range.
  • Manual Bypass(Optional)
  • No moving parts so no ware and tear and high reliability No Maintenance.
  • Silent operation.
  • Excellent Operation.
  • Excellent load protection capabilities so ensure load life.
  • Compatible with almost all load application.
  • Converter power handles only delta power so system becomes compact in size.
  • Static Voltage Stabilizer working on IGBT (static device) based PWM Control technology, No moving or mechanical contact for voltage regulation.
  • At the primary of buck-boost transformer delta Voltage is added and subtracted by IBGT based AC - AC converter to regulate output voltage.
  • Cycle by cycle voltage regulation without interrupting load current.


      PWM Controlled IGBT based technology Other Conventional Electromechanical Stabilizer
    1 Designed with fully solid state components to govern regulation, no moving part or tapchanging mechanism (relay / static device) This conventional method is designed with moving part (motor) or tap changing mechanism (Relay / static device) to govern regulation
    2 No maintenance required Periodic preventive maintenance required
    3 Due to the fully solid state drive and power circuitry which uses no mechanical parts in the regulation circuitry, operation is highly reliable, precise, noiseless, interruption-free and fast and the units are absolutely free from wear and malfunctions. The motor driven mechanical system, motor commutators, and the moving brushes on the variable transformer need
    4 Exceptionally high speed of voltage correction to meet modern voltage sensitive equipment Slow speed of voltage correction to meet modern equipment
    5 Because the series of Static Automatic Voltage Stabilizers function only through static electronic components, the speed of the line and load regulation is exceptionally high (of the order of 360 v/sec. line and 500 v/sec. load regulation) Ideal for modern voltage sensitive equipment. Because of the inertia of electro-mechanical regulation gear, Motor Driven Voltage Stabilizers can only respond to regulate the voltage fluctuations at a speed of 40 v/sec. in general and 70 v/sec. maximum.
    6 Inbuilt auto-bypass with no transition time In conventional stabilizer auto bypass is not there or with limitations
    7 PWM controlled IGBT based technology has advantage of providing auto bypass. System will get bypass if any electronics part will get failed with no transition time. In conventional method to achieve auto bypass feature excessive switch gear is required which add cost to the system as well this solution will provide power interrupt during bypass
    8 Same correction speed in all power range Correction range vary according to power range
    9 Static Voltage Stabilizer are manufactured through the power range from 2 KVA single phase to 600 KVA tri-phase with the same design and operation principal. Only different driver PCB's (printed circuit boards) are used all through the standard power range, so the compactness and reliability is unchanged. The Motor-Driven Voltage Stabilizers require excessive switch gear and additional buck-boost transformers when the nominal power is increased above a certain level.