Television receiver ferroresonant power supply disabling circuit

A television display system that includes a ferroresonant power supply with a protection circuit for disabling normal operation of a load circuit within said television display system during a fault operating condition, comprising:

• a source of direct voltage;
• an oscillator including output switching means coupled to said direct voltage source for developing at an output of said oscillator an alternating supply voltage having a frequency that is related to the frequency of operation of said oscillator, said oscillator including first control means for producing oscillator operation at a first frequency;
• a magnetizable core including a saturable core section;
• a winding located on said core;
• means responsive to said alternating supply voltage for developing an exciting current that generates a magnetic flux in said magnetizable core that links said winding to produce an alternating polarity output voltage;
• a capacitance associated with said winding for aiding in the magnetic saturation of said saturable core section during each cycle of said alternating polarity output voltage to regulate said output voltage by ferroresonant operation;
• a load circuit within said television display system that is energized by said regulated alternating polarity output voltage;
• means for generating a fault detection signal during the occurrence of a fault operating condition within said television display system;
• and
• auxiliary control means coupled to said oscillator and activated by said fault detection signal for changing the frequency of operation of said oscillator to a second one that produces a disruption of the operation of said ferroresonant power supply by means of the inability of said power supply to remain in ferroresonance in order to disable operation of said television display system load circuit.