Television deflector circuit with transformerless coupling between the driver and output stage

Claim 2

An electron beam deflection circuit, comprising: a deflection winding; a first source of direct current voltage; a switching means stage providing an operating current path for said deflection winding coupled to said deflection winding and said first voltage source; a source of periodic signals; a driver stage coupled through a first direct current path to said first source of voltage for obtaining operating current therefrom and to said source of periodic signals and to said switching means and responsive to said periodic signals for controlling the operation of said switching means from a first to a second state for causing operating current to flow in said deflection winding and for causing voltage variations to appear in said switching means stage; voltage rectifying means coupled to said switching means stage for rectifying said voltage variations appearing therein for producing a second direct current voltage which is relatively low compared to said first direct current voltage; and means coupling said rectifying means to said driver stage through a second direct current path whereby operating current for said driver stage is obtained primarily from said rectifying means when said voltage variations appear in said switching means stage.

Claim 3

An electron beam deflection circuit, comprising: a deflection winding; a transformer; a first source of direct current voltage; switching means coupled to said deflection winding, said transformer and said first voltage source; a source of periodic signals; a driver stage coupled through a first direct current path to said first source of voltage for obtaining operating current therefrom and to said source of periodic signals and to said switching means and responsive to said periodic signals for controlling the operation of said switching means from a first to a second state for causing operating current to flow in said deflection winding and for causing voltage variations in said transformer; voltage rectifying means coupled to a winding of said transformer for rectifying said voltage variations appearing across said winding for producing a second direct current voltage which is relatively low compared to said first direct current voltage; and means coupling said rectifying means to said driver stage through a second direct current path whereby operating current for said driver stage is obtained primarily from said rectifying means when said voltage variations appear across said winding.

Claim 4

An electron beam deflection circuit, comprising: a deflection winding; a transformer; a first source of direct current voltage; switching means coupled to said deflection winding, said transformer and said first voltage source; a source of periodic signals; a driver stage coupled through a first direct current path to said first source of voltage for obtaining operating current therefrom and to said source of periodic signals and to said switching means and responsive to said periodic signals for controlling the operation of said switching means from a first to a second state for causing operating current to flow in said deflection winding and for causing voltage variations in said transformer; voltage rectifying means coupled to a winding of said transformer for rectifying said voltage variations appearing across said winding for producing a second direct current voltage which is relatively low compared to said first direct current voltage; and means coupling said rectifying means to said driver stage through a second direct current path whereby operating current for said driver stage is obtained primarily from said rectifying means when said voltage variations appear across said winding.

Claim 5

In a television receiver in which a driver stage is transformerless coupled to a horizontal deflection output stage To cause said output stage to periodically conduct to form trace and retrace intervals during each horizontal scanning interval in response to horizontal rate signals coupled to said driver, operating current supply means for said driver stage, comprising: a first direct current voltage source; first impedance means coupling said first voltage source to said driver stage for supplying operating current thereto; a flyback transformer coupled to said output stage for producing voltage variations during said trace and retrace intervals as said first voltage source is supplying current to said driver stage; a second direct current voltage source including rectifying means coupled to said flyback transformer for transforming said flyback pulses into a second direct current voltage which is relatively low compared to said first direct current voltage; and second impedance means coupling said second source to said driver stage for supplying operating current thereto, said second impedance means having a lower impedance than said first impedance means such that the greater part of said driver stage operating current is supplied by said second voltage source during normal operation of said horizontal output stage.

Claim 6

In a television receiver in which a driver stage is transformerless coupled to a horizontal deflection output stage To cause said output stage to periodically conduct to form trace and retrace intervals during each horizontal scanning interval in response to horizontal rate signals coupled to said driver, operating current supply means for said driver stage, comprising: a first direct current voltage source; first impedance means coupling said first voltage source to said driver stage for supplying operating current thereto; a flyback transformer coupled to said output stage for producing voltage variations during said trace and retrace intervals as said first voltage source is supplying current to said driver stage; a second direct current voltage source including rectifying means coupled to said flyback transformer for transforming said flyback pulses into a second direct current voltage which is relatively low compared to said first direct current voltage; and second impedance means coupling said second source to said driver stage for supplying operating current thereto, said second impedance means having a lower impedance than said first impedance means such that the greater part of said driver stage operating current is supplied by said second voltage source during normal operation of said horizontal output stage.

Claim 7

In a television receiver, a horizontal beam deflection circuit comprising: a first voltage source; a flyback transformer including first and second windings; a deflection winding; a semiconductor output stage having an output electrode coupled to said deflection yoke, said first transformer winding and said first voltage source; a source of horizontal deflection rate signals; a semiconductor driver stage having a control electrode coupled to said source of horizontal rate signals and an output electrode coupled through first impedance means to said first voltage source, said output electrode also being coupled to a control electrode of said output stage for supplying drive signals thereto for causing said output stage to conduct current through said deflection winding and said first transformer winding; rectifying means coupled to said second transformer winding for rectifying voltage variations therein caused by said current in said first transformer winding; and second impedance means coupling said rectifying means to said output electrode of said driver stage for supplying operating current thereto, said second impedance means being selected such that the greater portion of drive current for said semiconductor output stage is conducted from said rectifying means following initial energization of said receiver.

Claim 8

In a television receiver, a horizontal beam deflection circuit comprising: a first voltage source; a flyback transformer including first and second windings; a deflection winding; a semiconductor output stage having an output electrode coupled to said deflection yoke, said first transformer winding and said first voltage source; a source of horizontal deflection rate signals; a semiconductor driver stage having a control electrode coupled to said source of horizontal rate signals and an output electrode coupled through first impedance means to said first voltage source, said output electrode also being coupled to a control electrode of said output stage for supplying drive signals thereto for causing said output stage to conduct current through said deflection winding and said first transformer winding; rectifying means coupled to said second transformer winding for rectifying voltage variations therein caused by said current in said first transformer winding; and second impedance means coupling said rectifying means to said output electrode of said driver stage for supplying operating current thereto, said second impedance means being selected such that the greater portion of drive current for said semiconductor output stage is conducted from said rectifying means following initial energization of said receiver.

Claim 9

In a television receiver, a drive circuit for a horizontal scanning circuit in which a semiconductor driver stage responsive to horizontal rate scanning signals is coupled by a capacitor to a semiconductor horizontal output stage which is energized through an output transformer coupled to a first source of direct current voltage for supplying scanning current to means including a horizontal deflection winding coupled to said output stage, and in which said driver stage controls the conduction of said output stage for forming trace and retrace scanning current intervals in response to said horizontal rate scanning signals, said drive circuit comprising: first impedance means coupling an output electrode of said driver stage to said first voltage source for supplying operating current thereto and for charging said capacitor for supplying a first portion of driver current to said output stage upon energization of said receiver; means coupled to said transformer for providing a second source of direct current voltage corresponding to said voltage variations in said transformer, said second voltage source providing a relatively stable voltage after several cycles of operation of said scanning circuit following energization of said receiver; and second impedance means coupling said second voltage source to said output electrode of said driver stage for supplying a second portion of Drive current for said output stage following said several cycles of operation.

Claim 10

In a television receiver, a drive circuit for a horizontal scanning circuit in which a semiconductor driver stage responsive to horizontal rate scanning signals is coupled by a capacitor to a semiconductor horizontal output stage which is energized through an output transformer coupled to a first source of direct current voltage for supplying scanning current to means including a horizontal deflection winding coupled to said output stage, and in which said driver stage controls the conduction of said output stage for forming trace and retrace scanning current intervals in response to said horizontal rate scanning signals, said drive circuit comprising: first impedance means coupling an output electrode of said driver stage to said first voltage source for supplying operating current thereto and for charging said capacitor for supplying a first portion of driver current to said output stage upon energization of said receiver; means coupled to said transformer for providing a second source of direct current voltage corresponding to said voltage variations in said transformer, said second voltage source providing a relatively stable voltage after several cycles of operation of said scanning circuit following energization of said receiver; and second impedance means coupling said second voltage source to said output electrode of said driver stage for supplying a second portion of Drive current for said output stage following said several cycles of operation.

Claim 11

A drive circuit according to claim 5 wherein said first voltage source is of a greater voltage than said second voltage source.

Claim 12

A drive circuit according to claim 6 wherein said first and second impedance means are selected such that said drive current supplied by said second voltage source is greater than that supplied by said first voltage source.

Claim 13

An electron beam scanning circuit, comprising: a first switching means; a source of periodic signals coupled to said first switching means for controlling the operation of said first switching means; second switching means; capacitive means coupling said first and second switching means; deflection current means including a deflection winding coupled to said second switching means; a first voltage source coupled through a first path to supply a first charging current to said capacitive means for operating said second switch for causing scanning current to flow in said deflection winding; second voltage source means coupled to said means including said deflection winding for producing a second voltage in response to current variations therein; means coupling said second voltage source through a second path for supplying a second charging current for said capacitive means, said means being selected such that said second charging current is larger than said first charging current; said source of periodic signals causing said first switching means to operate for providing a discharge path for said capacitive means, thereby controlling said second switching means for defining trace and retrace intervals during each scanning period.

Claim 14

An electron beam scanning circuit, comprising: a first switching means; a source of periodic signals coupled to said first switching means for controlling the operation of said first switching means; second switching means; capacitive means coupling said first and second switching means; deflection current means including a deflection winding coupled to said second switching means; a first voltage source coupled through a first path to supply a first charging current to said capacitive means for operating said second switch for causing scanning current to flow in said deflection winding; second voltage source means coupled to said means including said deflection winding for producing a second voltage in response to current variations therein; means coupling said second voltage source through a second path for supplying a second charging current for said capacitive means, said means being selected such that said second charging current is larger than said first charging current; said source of periodic signals causing said first switching means to operate for providing a discharge path for said capacitive means, thereby controlling said second switching means for defining trace and retrace intervals during each scanning period.