Abstract: A source of high frequency alternating input voltage is coupled to the primary winding of a high frequency low voltage ferroresonant transformer of a television receiver power supply. A capacitor is coupled across the secondary output winding of the ferroresonant transformer, and generates a circulating current that magnetically saturates the secondary core portion of the transformer to regulate the alternating polarity output voltage developed across the secondary output winding. A step-up high voltage transformer includes a primary winding and a high voltage secondary winding tightly coupled to the step-up transformer primary winding. The regulated alternating polarity output voltage developed by the low voltage ferroresonant transformer is coupled to the primary winding of the step-up high voltage transformer without prior DC rectification of the ferroresonant transformer output voltage.

Abstract: A high voltage generator of a television receiver is responsive to an alternating voltage, such as a retrace pulse voltage, and develops an ultor voltage at an ultor terminal. A high voltage protection circuit includes a comparator that, when activated, disables normal television display. A sense voltage representative of the ultor voltage is coupled to an input terminal of the comparator so as to activate the comparator when the ultor voltage exceeds a predetermined threshold level. A sense voltage representative of the ultor beam current is also coupled to an input terminal of the comparator so as to vary the threshold ultor voltage level at which the comparator is activated in accordance with beam current variations. When the ultor beam current exceeds a level indicative of high voltage generator overload, a switch that is coupled to an input terminal of the comparator changes states to activate the comparator and shut down the high voltage generator.

Abstract: A magnetic material to be located adjacent a neck portion of a cathode ray tube includes magnetized regions for producing an electron beam moving magnetic field for moving at least one electron beam within the cathode ray tube in a predetermined manner. A method for creating these magnetized regions comprises the steps of developing an appropriate magnetizing field that will magnetize magnetic domains within the magnetic material for creating the magnetized regions, and eliminating from the electron beam moving magnetic field a component contributed by relatively easily demagnetizable magnetic domains within the magnetized regions. The magnetized regions are thereby stabilized against the occurrence of significant changes in the values of the electron beam moving magnetic field.

Abstract: A deflection circuit for a television receiver comprises a deflection winding coupled to commutating and trace switches. A reactive circuit including a capacitor is coupled between the switches. A transient voltage damping circuit is coupled across the commutating switch. The damping circuit includes a transformer comprising a primary winding to which the transient voltages are coupled and a secondary winding coupled to an auxiliary load circuit.

Abstract: A biasing circuit biases the second of two input terminals of a differential amplifier at a first reference level. A sawtooth voltage of a first frequency is coupled to the first input terminal. A bilevel voltage generated at an output terminal of the differential amplifier shifts levels when the sawtooth voltage equals the first reference voltage level. A second biasing circuit coupled to the first input terminal biases the first input terminal at a second reference voltage level differing from the first reference level by an offset voltage. The second reference level is selected to equalize the duration of each of the bilevel voltages. Output signals are produced when the bilevel voltage shifts levels, thereby producing the output signals at twice the first frequency.