A Constant Voltage Transformer / CVT is apparently also known as a "Ferroresonant Transformer", and belongs to a class of Transformers called "Non-linear Transf

A Constant Voltage Transformer / CVT is apparently also known as a "Ferroresonant Transformer", and belongs to a class of Transformers called "Non-linear Transformers"... Related: https://www.aelgroup.co.uk/images/faq001_1.gif https://www.aelgroup.co.uk/images/faq001_1.gif https://hackaday.com/wp-content/uploads/2023/10/ferroresonant_constant_voltage_transformer_design.png https://hackaday.com/wp-content/uploads/2023/10/ferroresonan... https://ustpower.com/wp-content/uploads/2013/11/Ferroresonant-Transformer-Schematic.png https://ustpower.com/wp-content/uploads/2013/11/Ferroresonan... https://www.beltronicspower.com/images/constant_voltage_transformer_cvt.jpg https://www.beltronicspower.com/images/constant_voltage_tran... https://hackaday.com/2023/10/09/learning-about-ferroresonant-transformers-while-fixing-a-1970s-power-supply/ https://hackaday.com/2023/10/09/learning-about-ferroresonant... https://www.lamarchemfg.com/info/controlled-ferroresonant-technology.html https://www.lamarchemfg.com/info/controlled-ferroresonant-te... >"The ferroresonant power transformer can be controlled by varying voltage on the secondary tank circuit winding. This is done by electronically switching a choke across a portion of this winding using a bi-directional AC switch such as a triac or back to back SCR’s. It is only neccessay to control about 20% of the output power at this point in the circuit and the control power which circulates around the resonant tank is so small that it actually is lost as heat. The control is therefore efficient and output voltage regulation of ½% can be achieved with electronic output current limit in addition to the inherent magnetic current limit of the power transformer."