US 6,411,048 B1 · Method and device for controlling a circuit for the vertical deflection of a spot scanning a screen, in particular for a television set or a computer monitor

Abstract

The control device includes an output amplifier stage ETS supplied by a main supply for controlling the vertical scan of the spot, and an auxiliary supply capable of delivering an overvoltage and a first two-way switch connected to the output stage and controllable to allow the overvoltage to be delivered to the vertical deflection circuit for flyback of the spot. The output stage is a stage having at least two transistors which are capable of operating in alternating switching mode, at least for control of the vertical scan of the spot, this stage being associated with a smoothing filter connected to the common terminal of the two transistors. The device includes a second two-way switch connected between a first transistor of the output stage and a first terminal of the main supply and controllable to prevent delivery of the overvoltage during control of the vertical scan of the spot.

Claims76

Dependent claims

A device for controlling a vertical deflection circuit for the vertical scan and flyback of a spot scanning a screen, the device comprising:

an output amplifier stage for controlling the vertical scan of the spot, the output amplifier stage including at least first and second transistors connected together and capable of operating in an alternating switching mode to control the vertical scan of the spot;
an auxiliary voltage supply capable of delivering an overvoltage to the vertical deflection circuit;
a first controllable switch connected between the auxiliary voltage supply and the output amplifier stage for regulating the delivery of the overvoltage to the vertical deflection circuit for flyback of the spot;
and
a second controllable switch connected to the first transistor of the output amplifier stage and for connection to a main voltage supply, for preventing delivery of the overvoltage during control of the vertical scan of the spot;
wherein the first controllable switch comprises a third transistor and a third diode connected in anti-parallel with the terminals of the third transistor, an anode of the third diode being connected to the first transistor;
and
wherein the second controllable switch comprises a fourth transistor connected in series between the first transistor and the first terminal of the main voltage supply, and a fourth diode connected in anti-parallel with the terminals of the fourth transistor, a cathode of the fourth transistor being connected to the first transistor and an anode of the fourth transistor being connected to the first terminal of the main voltage supply, the fourth transistor being on while the third transistor is off, and vice versa.

5 more elements

A device for controlling a vertical deflection circuit for the vertical deflection of a spot scanning a screen, comprising:

an output amplifier stage having a plurality of transistors, capable of operating in Class-D operation for at least controlling a vertical scan of the spot;
a smoothing filter connected to a common terminal of the plurality of transistors;
a main supply for supplying the output amplifier stage;
an auxiliary supply for delivering an overvoltage to the vertical deflection circuit for flyback of the spot;
a first controllable two-way switch connected to the output amplifier stage and to the auxiliary supply;
a second controllable two-way switch connected between a first transistor of the output amplifier stage and a first terminal of the main supply;
and
a controller for controlling the plurality of transistors of the output amplifier stage in Class-D operation, for controlling the first controllable two-way switch to allow a current to flow through the first controllable two-way switch and allow the overvoltage to be delivered, and for controlling the second controllable two-way switch to prevent a current from flowing through the first controllable two-way switch during the vertical scan of the spot and thus prevent the overvoltage from being delivered during the vertical scan of the spot.

5 more elements

A display comprising:

a main voltage supply;
a screen;
a vertical deflection circuit for vertical scan and flyblack of a spot scanning the screen;
and
a device for controlling the vertical deflection circuit, the device comprising
an output amplifier stage for controlling the vertical scan of the spot, and including at least first and second transistors connected together and capable of operating in an alternating switching mode to control the vertical scan of the spot;
an auxiliary voltage supply capable of delivering an overvoltage to the vertical deflection circuit;
a first controllable switch connected between the auxiliary voltage supply and the output amplifier stage for regulating the delivery of the overvoltage to the vertical deflection circuit for flyback of the spot;
and
a second controllable switch connected to the first transistor of the output amplifier stage and for connection to the main voltage supply, for preventing delivery of the overvoltage during control of the vertical scan of the spot;
wherein the first controllable switch comprises a third transistor and a third diode connected in anti-parallel with the terminals of the third transistor, an anode of the third diode being connected to the first transistor;
and
wherein the second controllable switch comprises a fourth transistor connected in series between the first transistor and a first terminal of the main voltage supply, and a fourth diode connected in anti-parallel with the terminals of the fourth transistor, a cathode of the fourth transistor being connected to the first transistor and an anode of the fourth transistor being connected to the first terminal of the main voltage supply, the fourth transistor being on while the third transistor is off, and vice versa.

10 more elements

A display comprising:

a main voltage supply;
a screen;
a vertical deflection circuit for vertical scan and flyback of a spot scanning the screen;
and
a device for controlling the vertical deflection circuit, the device comprising
an output amplifier stage having a plurality of transistors, capable of operating in Class-D operation for at least controlling a vertical scan of the spot, and a smoothing filter connected to a common terminal of the plurality of transistors;
a main supply for supplying the output amplifier stage;
an auxiliary supply for delivering an overvoltage to the vertical deflection circuit for flyback of the spot;
a first controllable two-way switch connected to the output amplifier stage and to the auxiliary supply;
a second controllable two-way switch connected between a first transistor of the output amplifier stage and a first terminal of the main supply;
and
a controller for controlling the plurality of transistors of the output amplifier stage in Class-D operation, for controlling the first controllable two-way switch so as to allow a current to flow through the first controllable two-way switch and allow the overvoltage to be delivered, and for controlling the second controllable two-way switch so as to prevent a current from flowing through the first controllable two-way switch during the vertical scan of the spot and thus prevent the overvoltage from being delivered during the vertical scan of the spot.

9 more elements

A method for controlling a vertical deflection circuit for the vertical scan and flyback of a spot scanning a screen, the method comprising the steps of:

providing an output amplifier stage to control the vertical scan of the spot, the output amplifier stage including at least first and second transistors connected together and capable of operating in an alternating switching mode to control the vertical scan of the spot;
delivering an overvoltage to the vertical deflection circuit;
regulating the delivery of the overvoltage to the vertical deflection circuit for flyback of the spot with a first controllable switch connected to the output amplifier stage, the first controllable switch comprising a third transistor and a third diode connected in anti-parallel with the terminals of the third transistor, an anode of the third diode being connected to the first transistor;
preventing delivery of the overvoltage during control of the vertical scan of the spot with a second controllable switch connected to the first transistor of the output amplifier stage and for connection to a main voltage supply, the second controllable switch comprising a fourth transistor connected in series between the first transistor and the first terminal of the main voltage supply, and a fourth diode connected in anti-parallel with the terminals of the fourth transistor, a cathode of the fourth transistor being connected to the first transistor and an anode of the fourth transistor being connected to the first terminal of the main voltage supply;
turning the fourth transistor on while turning the third transistor off;
and
turning the fourth transistor off while turning the third transistor on.

4 more elements

A method for controlling a vertical deflection circuit for the vertical deflection of a spot scanning a screen, comprising the steps of:

providing an output amplifier stage having at least two transistors which operate in Class-D operation at least for controlling a vertical scan of the spot;
supplying the output amplifier stage by a main supply;
and
providing an auxiliary supply for delivering an overvoltage to the vertical deflection circuit to initiate the flyback of the spot, the overvoltage being delivered by controlling a first two-way switch connected to the output amplifier stage and to the auxiliary supply to allow a current to flow through the first two-way switch and controlling a second two-way switch, connected between a first transistor of the output stage and a first terminal of the main supply, to prevent a current from flowing through the first switch during the vertical scan of the spot and thus prevent the overvoltage from being delivered during the vertical scan of the spot.

1 more element

A device for controlling a vertical deflection circuit for the vertical scan and flyback of a spot scanning a screen, the device comprising:

an output amplifier stage for controlling the vertical scan of the spot, the output amplifier stage including at least first and second transistors connected together and capable of operating in an alternating switching mode to control the vertical scan of the spot;
an auxiliary voltage supply capable of delivering an overvoltage to the vertical deflection circuit;
a first controllable switch connected between the auxiliary voltage supply and the output amplifier stage for regulating the delivery of the overvoltage to the vertical deflection circuit for flyback of the spot;
a second controllable switch connected to the output amplifier stage and for connection to a main voltage supply, for preventing delivery of the overvoltage during control of the vertical scan of the spot;
and
a controllable auxiliary switch;
wherein the auxiliary voltage supply comprises a capacitor having a first terminal connected to a first terminal of the main voltage supply via the first controllable switch and to a second terminal of the main voltage supply via the controllable auxiliary switch, and having a second terminal connected to the output amplifier stage and to the second controllable switch, the controllable auxiliary switch being open when the first controllable switch is closed, and vice versa.

4 more elements

A display comprising:

a main voltage supply;
a screen;
a vertical deflection circuit for vertical scan and flyback of a spot scanning the screen;
and
a device for controlling the vertical deflection circuit, the device comprising
an output amplifier stage for controlling the vertical scan of the spot, and including at least first and second transistors connected together and capable of operating in an alternating switching mode to control the vertical scan of the spot;
an auxiliary voltage supply capable of delivering an overvoltage to the vertical deflection circuit;
a first controllable switch connected between the auxiliary voltage supply and the output amplifier stage for regulating the delivery,of the overvoltage to the vertical deflection circuit for flyback of the spot;
a second controllable switch connected to the output amplifier stage and for connection to the main voltage supply, for preventing delivery of the overvoltage during control of the vertical scan of the spot;
and
a controllable auxiliary switch;
wherein the auxiliary voltage supply comprises a capacitor having a first terminal connected to a first terminal of the main voltage supply via the first controllable switch and to a second terminal of the main voltage supply via the controllable auxiliary switch, and having a second terminal connected to the output amplifier stage and to the second controllable switch, the controllable auxiliary switch being open when the first controllable switch is closed, and vice versa.

9 more elements

Dependencies are inferred from the claim text.

Method and device for controlling a circuit for the vertical deflection of a spot scanning a screen, in particular for a television set or a computer monitor

Life of this patent

Method and device for controlling a circuit for the vertical deflection of a spot scanning a screen, in particular for a television set or a computer monitor

Life of this patent

Abstract

Claims76