High power factor integrated controlled ferroresonant constant current source

A method of designing a high power factor integrated ferroresonant constant current source comprising the steps of:

• providing an input coil disposed about a ferromagnetic core and to be coupled to an AC voltage source;
• providing an output coil disposed about the core and to be coupled to a load;
• providing a control coil disposed about the core and coupled to a switch for regulating current output of the constant current source;
• providing a first capacitor coil disposed about the core and inductively coupled to the output coil and coupled to a capacitor to provide a first resonant sub-circuit having maximum gain, and a second capacitor coil disposed about the core and inductively coupled to the control coil and coupled to a capacitor to provide a second resonant sub-circuit to control resonant gain;
• and
• selecting a flux density (BPRI) of a portion of the core around the input coil that is about one half flux density BCAP of a portion of the core around the capacitor coils.

A method of designing a high power factor integrated ferroresonant constant current source comprising the steps of:

• providing an input coil disposed about a ferromagnetic core and to be coupled to an AC voltage source;
• providing an output coil disposed about the core and to be coupled to a load;
• providing a control coil disposed about the core and coupled to a switch for regulating current output of the constant current source;
• providing a first capacitor coil disposed about the core and inductively coupled to the output coil and coupled to a capacitor to provide a first resonant sub-circuit having maximum gain, and a second capacitor coil disposed about the core and inductively coupled to the control coil and coupled to a capacitor to provide a second resonant sub-circuit to control resonant gain;
• selecting a flux density (BPRI) of a portion of the core around the input coil that is about one half flux density BCAP of a portion of the core around the capacitor coils;
• and
• selecting a leakage reactance XS satisfying the following mathematical expression:
• X S ≤ R 2 + X O 2 RA ,
• where R is resistance of all of the windings, XO is reactance of an output inductor magnetically coupled to a resonant capacitor, and A is a capacitor voltage gain.