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We are manufacturer and exporter of various types of CVT which areFerro resonant types and gives Constant Output Voltages.
The ferroresonant transformers, which are also known as Constant Voltage Transformers (CVTs) or ferros, are also good surge suppressors, as they provide high isolation and inherent short-circuit protection.
The phenomenon which makes the CVT special is "Ferro Resonance". This is achieved by resonating of the output secondary coil with selected high stability capacitors. This resonant circuit is so dimensioned that the secondary part of the transformer core is separated during each half cycle. In this way the output voltage of the transformer is nearly constant even for large variation in the Input Voltages. By design Purevolt's CVT has sinusoidal waveform. All problems related to variation / fluctuations in Voltages are affectively handled because of this principle and a constant voltage output of +- 1% is given by Purevolt CVT.
The ferroresonant action is a flux limiter rather than a voltage regulator, but with a fixed supply frequency it can maintain an almost constant average output voltage even as the input voltage varies widely.