Ferroresonant transformer for use in uninterruptible power supplies

An uninterruptible power supply for supplying power to a load, comprising:

• a transformer comprising
• a core,
• a main shunt arranged relative to the core to define a primary side and a secondary side of the transformer,
• first windings arranged on the primary side of the transformer,
• second windings arranged on the secondary side of the transformer, and
• third windings arranged on the secondary side of the transformer,
• a resonant capacitor operatively connected to the third windings;
• a primary power source operatively connected to the first windings;
• and
• a secondary power source operatively connected to the second windings;
• wherein
• the load is connected to at least a portion of the third windings;
• in a line mode, the primary power source causes a primary signal to be present on the first windings such that a first output signal supplied to the load based on the primary signal;
• and
• in a standby mode, the secondary power source causes a secondary signal to be present on the second windings such that a second output signal is supplied to the load based on the secondary signal.

A method of supplying uninterruptible power to a load, comprising the steps:

• providing a core;
• arranging a main shunt relative to the core to define a primary side and a secondary side;
• arranging first windings arranged on the primary side;
• arranging second windings on the secondary side;
• arranging third windings on the secondary side;
• operatively connecting a resonant capacitor to the third windings;
• operatively connecting a primary power source to the first windings;
• operatively connecting a secondary power source to the second windings;
• operatively connecting the load to at least a portion of the third windings;
• operating in one of a line mode or a standby mode, whereby
• when operating in the line mode, the primary power source causes a primary signal to be present on the first windings such that a first output signal supplied to the load;
• and
• when operating in the standby mode, the secondary power source causes a secondary signal to be present on the second windings such that a second output signal is supplied to the load.