AC line stabilization circuitry for high power factor loads

A method for stabilizing a voltage supply during energy surges and for providing holdover during AC line dropout conditions, said voltage supply comprising a substantial DC component and being derived from said AC line, said method comprising the steps of:

• sensing when the AC line voltage decreases below a first predetermined voltage;
• sensing when said AC line voltage exceeds a second predetermined voltage;
• actuating a switch responsive to the sensing of when said AC line voltage decreases below said first predetermined voltage or exceeds said second predetermined voltage;
• and
• providing stabilization means for stabilizing said voltage supply in response to actuation of the switch.

A circuit for stabilizing a voltage applied to a load, said voltage comprising a substantial DC component and being derived from an AC source, said circuit comprising:

• a switch;
• a capacitor connected in series with said switch, the switch and capacitor series being connected in parallel with said load;
• and
• means for sensing when said applied voltage or said AC source rises above a predetermined threshold voltage and in response, activating said switch such that current flows from said applied voltage through said capacitor to dissipate the applied voltage rise or AC source rise, said switch being oriented to complete a path of said current from said capacitor to ground.