Horizontal deflection circuit for television receivers

Claim 2

A horizontal deflection circuit for television receivers, comprising: means for controlling the horizontal sweep; means for controlling commutation; a deflection unit controlled by the previously mentioned means; a d.c. voltage source; a storage inductance connected in series with the d.c. voltage source and the deflection unit, said commutation control means formed and arranged to apply d.c. energy to the storage inductance from the d.c. source during periods of commutation; and a controlled semiconductor switch connected in series with the d.c. voltage source and the storage inductance, the conducting period of the semiconductor switch being variable as a function of a control variable across the deflection unit.

Claim 3

A horizontal deflection unit for television receivers as described in claim 1, wherein the controlled semiconductor switch is a thyristor having a forward direction corresponding to the flow direction of the supply current, said thyristor being turned off by reversing the direction of current in the storage inductance and the conducting period of the thyristor being controlled by shifting the turn-on instant.

Claim 4

A horizontal deflection circuit for television receivers having a horizontaal final stage including a deflection unit, means for controlling a horizontal sweep, means for controlling commutation and a controllable supply circuit for controlling energy provided to the horizontal final stage, said supply circuit comprising: a d.c. voltage source; a storage inductance connected in series with the d.c. voltage source and the deflection unit, said commutation control means formed and arranged to apply d.c. energy to the storage inductance from the d.c. source during periods of commutation; and electronic switch means connected in series with the storage inductance and the d.c. voltage source for providing a controlled period of current flow to the storage inductance in accordance with a controlled variable developed across the deflection unit during commutation.

Claim 5

A horizontal deflection circuit for television receivers having a horizontaal final stage including a deflection unit, means for controlling a horizontal sweep, means for controlling commutation and a controllable supply circuit for controlling energy provided to the horizontal final stage, said supply circuit comprising: a d.c. voltage source; a storage inductance connected in series with the d.c. voltage source and the deflection unit, said commutation control means formed and arranged to apply d.c. energy to the storage inductance from the d.c. source during periods of commutation; and electronic switch means connected in series with the storage inductance and the d.c. voltage source for providing a controlled period of current flow to the storage inductance in accordance with a controlled variable developed across the deflection unit during commutation.

Claim 6

A horizontal deflection circuit as described in claim 3 wherein the electronic switch means comprises: a semiconductor switch; and a control circuit for controlling the semiconductor switch in accordance with a controlled variable developed across the deflection unit during commutation.

Claim 7

A horizontal deflection circuit as described in claim 4 wherein the semiconductor switch comprises a thyristor having a gate connected to the control circuit for receiving a pulse signal therefrom.

Claim 8

A horizontal deflection circuit as described in claim 4 wherein the semiconductor switch is turned on during the period of commutation and is caused to turn off by the current reversal subsequent to commutation.

Claim 9

A horizontal deflection circuit as described in claim 4 wherein the control variable is a horizontal kickback pulse.

Claim 10

A horizontal deflection circuit as described in claim 4 wherein the control circuit is a pulse width modulator for providing a pulse having a width corresponding to the controlled variable.

Claim 11

A horizontal deflection circuit for television receivers, comprising: a horizontal final stage including a deflection unit; a d.c. energy source; and electronic switch means connected in series with the energy source and the horizontal final stage for providing a controlled period of current flow to the horizontal final stage in accordance with a coNtrolled variable developed across the deflection unit.

Claim 12

A horizontal deflection circuit for television receivers, comprising: a horizontal final stage including a deflection unit; a d.c. energy source; and electronic switch means connected in series with the energy source and the horizontal final stage for providing a controlled period of current flow to the horizontal final stage in accordance with a coNtrolled variable developed across the deflection unit.

Claim 13

A horizontal deflection circuit as described in claim 9, additionally comprising means for maintaining the electronic switch means in an off condition whereby the television receiver is turned off.