Abstract: A ferroresonant power supply for a television receiver includes a saturable reactor having a magnetizable core and a winding located thereon. Exciting current for the saturable reactor is developed from a source of unregulated input voltage. A magnetic flux is generated in the magnetizable core that links the reactor winding to develop an alternating polarity output voltage. A capacitor develops a circulating current that generates a magnetizing force in a core section associated with the reactor winding. A permanent magnet biases the core to produce a second magnetizing force in the associated core section. The resultant of the two magnetizing forces develops a magnetic flux that substantially saturates the magnetizable material of the associated core section during each cycle of the alternating polarity output voltage to regulate the output voltage.

Abstract: In a television receiver with a regulated power supply that is responsive to the state of a remote on/off command signal, a power oscillator is coupled to an unregulated direct voltage source for developing an alternating input voltage of a frequency determined by the frequency of operation of the oscillator. The oscillator is provided with a frequency control terminal that controls the oscillator frequency, depending upon a control signal applied to the terminal. A ferroresonant or self-regulating circuit is energized by the alternating input voltage to produce a regulated supply voltage that in turn energizes a load circuit within the television receiver.

Abstract: The primary winding of a high leakage transformer is coupled to a source of alternating input voltage for developing an alternating supply voltage across a secondary winding of the transformer. A self-regulating, ferroresonant load circuit includes a saturable reactor that has a first winding coupled to the transformer secondary winding for regulating the supply voltage. A high voltage winding of the transformer steps up the supply voltage. The stepped up voltage is rectified to produce an ultor accelerating potential for a color picture tube of a television receiver. If the saturable reactor first winding is disconnected from the transformer secondary winding, the supply voltage and ultor accelerating potential undesirably tend to increase in amplitude. To protect against the emission of excessive X-radiation from the phosphor screen of the picture tube in such an event, the heater filaments of the picture tube cathode electrodes are energized by a second winding of the saturable reactor.

Abstract: In a television receiver regulated power supply that is responsive to the state of a remote on/off command signal, the AC mains supply voltage is connected to the input terminals of a bridge rectifier through the mechanical switch portion of an on/off relay. A remote control circuit energizes the relay coil to close the mechanical switch upon receipt of the on-state command signal. The bridge rectifier then develops an unregulated DC voltage that is applied to a high frequency inverter for developing an alternating polarity input voltage. The alternating polarity input voltage is applied to a self-regulating or ferroresonant power supply circuit to produce regulated output voltages for various television receiver load circuits such as the ultor load and the horizontal deflection circuit.

Abstract: A primary winding of a power transformer is coupled to a source of DC voltage. First and second controllable switches are coupled to the primary winding in a push-pull arrangement. A control circuit responsive to a deflection rate input signal that is synchronized with deflection circuit scanning applies a turn-off switching signal alternately to the two controllable switches during each deflection cycle. In response to the turnoff of each one of the two controllable switches, a turn-on switching signal is applied to the other switch to develop a deflection rate alternating polarity output voltage across an output winding of the power transformer. The output voltage is rectified and applied to a deflection generator to thereby energize the generator into developing scanning current in a deflection winding.

Abstract: A television display system includes a ferroresonant power supply with a protection circuit for disabling normal operation of a load circuit within the television display system during a fault operating condition. An exciting current is developed from a source of alternating input voltage, controllable in frequency of operation. In response to the exciting current, a magnetic flux is generated in the magnetizable core of a saturable reactor to link a winding located on the core for developing an alternating polarity output voltage. A capacitance associated with the winding generates another magnetic flux in the magnetizable core that in conjunction with the first magnetic flux magnetically saturates a saturable core section during each cycle of the alternating polarity output voltage for regulating the output voltage by ferroresonant operation. A load circuit within the television display system is energized by the regulated alternating polarity output voltage.

Abstract: The primary winding of a high leakage inductance transformer is coupled to a source of alternating input voltage to develop alternating polarity output voltages across tightly coupled secondary windings, including a high voltage winding of the transformer. Various DC supply voltages, including the ultor voltage, are derived from the secondary winding output voltages. To regulate the secondary winding output voltages, a ferroresonant circuit comprising a capacitor and a saturable reactor is coupled as a load circuit to one of the transformer secondary windings. When the saturable reactor magnetically saturates during each half cycle of the alternating polarity output voltage, a circulating current is generated and flows between the saturable reactor and the capacitor.

Abstract: A television receiver high voltage generator includes a high voltage transformer for developing an ultor accelerating potential at an ultor output terminal. A high voltage protection circuit comprises a comparator and a disabling circuit coupled to an output terminal of the comparator. An ultor accelerating potential representative signal is applied to an input terminal of the comparator to disable normal television receiver operation when the ultor accelerating potential exceeds predetermined values. To avoid nuisance tripping or energization of the disabling circuit at lower beam current levels, beam current information is applied to an input terminal of the comparator such that at low beam current operating levels, a greater ultor accelerating potential must be exceeded before the disabling circuit is energized, than at high beam current operating levels.

Abstract: An inverter coupled to a source of DC input voltage is operated at the horizontal deflection frequency for developing a horizontal rate square-wave supply voltage. A power transformer having a first winding excited by the square-wave supply voltage develops a horizontal rate alternating polarity output voltage across second and third windings. A horizontal deflection generator is coupled to the second winding and is energized thereby to develop a trace voltage across a race capacitor. The deflection generator includes a trace switch coupled across the series arrangement of a horizontal deflection winding, the trace capacitor and the power transformer third winding. The trace switch is operated at a horizontal rate to generate horizontal deflection or scanning current in the deflection winding.

Abstract: A television horizontal AFPC system is provided including a first AFPC loop responsive to horizontal sync signals for producing a noise immune signal in phase and frequency synchronism with the horizontal sync signals. A second AFPC loop includes a phase detector responsive to a second horizontal frequency signal and flyback pulses, and produces horizontal deflection drive signals as a function of the phase relationship determined by the phase detector. A delay circuit is responsive to the noise immune horizontal frequency signal for producing the second horizontal frequency signal for the phase detector with a phase delayed with respect to the noise immune signal. A lowpass filter may be provided to delay the application of the flyback pulses to the second phase detector, its delay being chosen in accordance with the delay of the delay circuit so that a centered picture is produced on the television kinescope.

Abstract: An inverter applies a square-wave exciting voltage of horizontal deflection frequency to the primary winding of a ferroresonant power transformer. A square-wave alternating polarity output voltage developed across a secondary winding of the ferroresonant transformer is half-wave rectified and applied to an input choke of a horizontal deflection circuit. The input choke is coupled to the series arrangement of a horizontal deflection winding and a trace capacitor. A pincushion correction circuit switching transistor applies a DC voltage to the input choke at a controlled instant within the nonconduction interval of the half-wave rectified output voltage. The peak-to-peak horizontal scanning current is a function of the average voltage developed across the trace capacitor. This average voltage equals the average value of the voltage applied to the input choke.

Abstract: In a remote controlled television receiver, the regulator circuit of the main television receiver power supply is made responsive to a remote on/off command signal in order to turn the receiver on and off. A deflection flyback transformer provides operating voltages to the ultor supply and other auxiliary supplies which power such load circuits as audio and vertical deflection. A horizontal output transistor is coupled to a B+ operating voltage terminal of the main power supply through a flyback transformer primary winding. After initiation of the on-state of the command signal, the regulator ciruit rapidly develops a B+ operating voltage. The initially uncharged filter capacitors of the auxiliary supplies act as a low impedance shunt across the flyback transformer primary winding during the start-up interval.

Abstract: A degaussing network of a remote controlled color television receiver is energized by a remote-responsive power supply rather than by the contact closure of a mechanical or electromechanical switch. The power supply includes a series-pass semiconductor element for developing a direct current voltage at an output terminal of the power supply derived from a source of alternating current voltage coupled across two input terminals. The regulator control circuit for the semiconductor element is responsive to the state of an on/off command signal. The power supply operates during the on-state of the command signal to provide the direct current voltage at the output terminal. The power supply regulator control circuit maintains the semiconductor element nonconductive in the off-state. The degaussing network, including a degaussing winding and a thermistor, is coupled to the output terminal of the power supply.

Abstract: A television phase-lock (AFPC) loop is used to maintain a horizontal oscillator in synchronism with horizontal synchronizing signals in the presence of noise. The AFPC loop includes a phase detector and a controlled oscillator. The synchronizing signals are applied to one input of the phase detector and the oscillator output is applied to the other phase-detector input. The phase-detector output is coupled back to the oscillator control input to maintain the oscillator output in frequency synchronism. During the vertical synchronizing and equalizing pulse intervals, the synchronizing signals applied to the AFPC phase detector increase in frequency. The increase in frequency may decrease the AFPC loop gain or unsynchronize the loop. This effect is overcome by providing a second output from the horizontal oscillator at a frequency higher than, but related to the frequency of the desired output, and using the higher frequency to drive the phase detector.

Abstract: First and second capacitors are charged from a DC source of unregulated input voltage through the primary winding of a flyback transformer of a horizontal deflection circuit. The average voltage across the first capacitor is established as the voltage difference between the input voltage and the average voltage across the second capacitor. The first capacitor functions as a trace capacitor for a horizontal deflection winding. A switch applies a trace voltage to the horizontal deflection winding to generate a trace deflection current. The switch also applies the voltages developed across the second capacitor and across a flyback transformer secondary winding to a regulator inductance to control the flow of current in the second capacitor. The current flowing through the inductance is varied in order to control the voltage across the second capacitor for regulating a selected deflection circuit quantity.

Abstract: A trace switch including a horizontal output transistor is coupled across the series arrangement of a horizontal deflection winding and trace capacitor. The trace capacitor is charged from a source of unregulated DC input voltage through the primary winding of a flyback transformer. The emitter of the horizontal output transistor is coupled to ground through a first winding of a second transformer. A second capacitor is coupled between ground and the series arrangement of the deflection winding and trace capacitor. The average trace voltage across the trace capacitor is constrained to assume the difference in voltage between the unregulated input voltage and the voltage developed across the second capacitor. The charge/discharge cycle of the second capacitor is controlled by the current flowing in the second transformer.

Abstract: A deflection generator develops scanning current in a horizontal deflection winding. A high voltage winding of a flyback transformer generates a high voltage for the picture tube ultor terminal. A high voltage safety circuit includes a flyback transformer secondary winding for applying a peak detected retrace pulse voltage to a disabling latch circuit. If the high voltage exceeds predetermined values, the latch is energized and disables normal operation of the deflection generator. Components of the sustaining current that maintains the latch in a regeneratively conducting state are derived from two voltage sources, with the current component derived from one of the two voltage sources by itself insufficient to maintain the latch in the regeneratively conducting state.

Abstract: A source of unregulated direct voltage has a terminal coupled to a capacitor. A horizontal deflection circuit is coupled to a first terminal of the source and to the capacitor so as to be energized by a regulated voltage established by the difference between the unregulated voltage and the voltage across the capacitor. The deflection switching transistor is serially coupled with an additional controllable switch, and an inducator is coupled between the junction of the switches and the second terminal of the source of unregulated direct voltage to provide a controllable path for current flow in the capacitor. The controllable switches are operated at the deflection rate to generate deflection currents and to control the state of charge of the capacitor to maintain a constant regulated voltage. The energy represented by periodic discharge of the capacitor is recovered.

Abstract: In a video signal processing system, apparatus for limiting excessive peak and average beam currents demanded by a kinescope in response to image representative video signals. A control signal derived by a sensing circuit in response to excessive beam current is applied to the kinescope in a manner to limit excessive beam currents above a threshold level. The sensing circuit includes a capacitor arranged with a conductive diode to form an average responding filter such that the sensing circuit derives a control voltage representative of excessive average beam current in a first beam current limiting mode. In a second beam limiting mode, when beam current exceeds a predetermined level, the diode is rendered nonconductive and the capacitor is decoupled for average detection purposes. In this mode, the control signal is free to vary in accordance with rapid variations in peak beam current.

Abstract: A controllable switch is coupled to a source of unregulated direct voltage and in a closed loop with a filter inductor and a storage capacitor and has its on-off state controlled at the horizontal deflection rate to control the voltage across the capacitor and regulate a voltage. A diode is coupled with the filter inductor and storage capacitor to form a second series circuit through which current can continue to flow in the inductor when the controllable switch is opened. The controllable switch is opened abruptly by application of a reverse biasing flyback pulse to its main current conducting path. The flow of current in the filter inductor is smoothed and may extend over the entire horizontal cycle.