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Electronic transformer

Electronic transformers have been commercially available for a number of years. In electronic transformers, the mains voltage supplied from the mains is firstly rectified. The rectified mains voltage supplies energy for an inverter. The inverter outputs a high-frequency voltage which can be transformed to the desired voltage with the aid of an output transformer. Electronic transformers may be AC or DC (input and) output units. In the case of DC output transformers, a chopper is used to convert the DC voltage to a pulsating voltage, which may then be transformed to a different voltage, and ultimately rectified and smoothed. An electronic ballast is used to convert commercial electrical power into a high voltage electrical signal sufficient to create and maintain a plasma in a gas discharge lamp. Typical examples of gas discharge lamps are fluorescent lamps and neon lamps. Transformers are typically used in ballast circuits to boost the voltage across the lamps. Electronic transformer designs can solve some shortcomings found in conventional transformer technology, such as voltage drop under increasing load, "flat topped" voltage under saturation, harmonic sensitivity, containment requirements for oil spill, limited performance under DC offset load unbalances, providing options for high-frequency AC.

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