Television deflection circuit with low power requirement

Claim 2

A deflection circuit comprising: output amplifier means including a pair of serially coupled transistors; a source of deflection drive signals coupled to the input electrodes of said pair of transistors, said signals causing said amplifier to operate for defining trace and retrace intervals during each deflection scanning cycle; a deflection winding coupled to an output terminal of said amplifier; a source of operating potential; first unidirectional current conducting means serially coupled between said source and a terminal in the series conduction path of said amplifier for providing operating current thereto; energy storage means coupled to said source and to said terminal in said conduction path; and second unidirectional current conducting means coupled to said deflection winding and to said terminal in said conduction path and poled to conduct current during a first portion of said retrace interval of said deflection cycle for supplying energy to said energy storage means, said energy storage means supplying said stored energy to said amplifier stage during a second portion of said retrace interval of said deflection cycle.

Claim 3

A deflection circuit according to claim 1 wherein said energy storage means includes a capacitor.

Claim 4

A deflection circuit according to claim 2 wherein said pair of serially coupled transistors are of opposite conductivity types and wherein the emitter electrode of one transistor is coupled to the emitter electrode of the other transistor.

Claim 5

A deflection circuit according to claim 3 wherein said first unidirectional current conducting means is a diode and said terminal in said series conduction path is in the collector circuit of one of said transistors.

Claim 6

A deflection circuit comprising: a push-pull amplifier stage comprising first and second serially coupled transistors; a source of operating potential; first unidirectional current conducting means serially coupled between said source of operating potential and said serially coupled transistors and poled for providing a path for operating current from said source to said transistors; a deflection winding coupled to the junction of said first and second transistors; a signal source coupled to the input electrodes of said first and second transistors and providing deflection drive signals for controlling the conduction of said first and second transistors for defining trace and retrace intervals during each deflection cycle, a retrace voltage pulse being developed across said deflection winding during said retrace interval, said retrace pulse being of a greater magnitude than said source of operating potential; a second unidirectional current conducting device coupled from the junction of said first and second transistors to the terminal of said first unidirectional current conducting device remote from said source of operating potential and poled for conducting said retrace pulse; and energy storage means coupled to the junction of said first and second unidirectional current conducting devices and to a point of reference potential, said storage means operating in a resonant manner with said deflection winding for storing energy from said retrace pulse during a first portion of said retrace interval and supplying operating current to said amplifier during a second portion of said retrace interval.

Claim 7

A deflection circuit comprising: a push-pull amplifier stage comprising first and second serially coupled transistors; a source of operating potential; first unidirectional current conducting means serially coupled between said source of operating potential and said serially coupled transistors and poled for providing a path for operating current from said source to said transistors; a deflection winding coupled to the junction of said first and second transistors; a signal source coupled to the input electrodes of said first and second transistors and providing deflection drive signals for controlling the conduction of said first and second transistors for defining trace and retrace intervals during each deflection cycle, a retrace voltage pulse being developed across said deflection winding during said retrace interval, said retrace pulse being of a greater magnitude than said source of operating potential; a second unidirectional current conducting device coupled from the junction of said first and second transistors to the terminal of said first unidirectional current conducting device remote from said source of operating potential and poled for conducting said retrace pulse; and energy storage means coupled to the junction of said first and second unidirectional current conducting devices and to a point of reference potential, said storage means operating in a resonant manner with said deflection winding for storing energy from said retrace pulse during a first portion of said retrace interval and supplying operating current to said amplifier during a second portion of said retrace interval.

Claim 8

A deflection circuit according to claim 5 wherein said first and second unidirectional current conducting means are diodes and said energy storage means is a capacitor.

Claim 9

A deflection circuit according to claim 6 wherein said first and second transistors are of opposite conductivity types arranged for forming a complementary symmetry amplifier stage.

Claim 10

A deflection circuit according to claim 7 wherein the respective emitter electrodes of said first and second transistors are coupled together and said first diode is coupled between said source of operating potential and the collector electrode of one of said first and second transistors.

Claim 11

A deflection circuit in which the retrace pulse voltage, having a potential greater than the supply voltage providing operating current to the circuit, developed across a deflection winding is recovered and returned to the deflection circuit during the retrace interval, said circuit comprising: an amplifier including two serially coupled transistors having their output electrodes coupled together, the junction of said output electrodes forming an output terminal; a source of deflection signals coupled to the input electrodes of said transistors for controlling the conduction thereof for defining trace and retrace intervals during each deflection cycle; a source of operating potential; a first diode serially coupled between said source of operating potential and said serially coupled transistors and poled for providing operating current thereto; a deflection winding coupled to said output terminal; capacitive means coupled between the junction of said first diode and said transistors and a point of reference potential and selected to resonate with said winding during said retrace interval; and a second diode coupled between said output terminal and said terminal of said capacitive means remote from said point of reference potential and poled for conducting said retrace pulse voltage for charging said capacitive means during a first portion of said retrace interval when current is in a first direction in said deflection winding, said capacitive means discharging through one of said transistors to said deflection winding when current is in the other direction in said winding during a second portion of said retrace interval.

Claim 12

A deflection circuit in which the retrace pulse voltage, having a potential greater than the supply voltage providing operating current to the circuit, developed across a deflection winding is recovered and returned to the deflection circuit during the retrace interval, said circuit comprising: an amplifier including two serially coupled transistors having their output electrodes coupled together, the junction of said output electrodes forming an output terminal; a source of deflection signals coupled to the input electrodes of said transistors for controlling the conduction thereof for defining trace and retrace intervals during each deflection cycle; a source of operating potential; a first diode serially coupled between said source of operating potential and said serially coupled transistors and poled for providing operating current thereto; a deflection winding coupled to said output terminal; capacitive means coupled between the junction of said first diode and said transistors and a point of reference potential and selected to resonate with said winding during said retrace interval; and a second diode coupled between said output terminal and said terminal of said capacitive means remote from said point of reference potential and poled for conducting said retrace pulse voltage for charging said capacitive means during a first portion of said retrace interval when current is in a first direction in said deflection winding, said capacitive means discharging through one of said transistors to said deflection winding when current is in the other direction in said winding during a second portion of said retrace interval.