15-11-2012, 02:06 PM
STATIC VOLTAGE STABILIZER
Copy of STATIC VOLTAGE STABILIZER 2003.doc (Size: 139.5 KB / Downloads: 110)
INTRODUCTION:
• This 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.
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.
APPLICATIONS:
• This is especially 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, automatic bypass, no wear and tear, long life and maintenance free.
• We can use discrete IGBTs and make the circuit very compact and very high efficient and cost effective. 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.