Device for the control of a circuit for the vertical deflection of a spot scanning a screen
AssigneeSTMicroelectronics S.r.l.
InventorsPhilippe Maige, Yannick Guedon
Life of this patent
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Abstract
Disclosed is a device to control a circuit for the vertical deflection of a spot scanning a screen, and more particularly a control device whose output amplifier stage works in class D mode at the rate of a switching signal called a first switching signal. The control device has an internal auxiliary supply to generate the overvoltage needed for the fast flyback of the spot. This auxiliary power supply is a switching voltage generation circuit whose switching signal, called a second switching signal, is synchronous with the first switching signal. The present invention has been shown to used advantageously in television screens and/or computer screens.
Claims16
A device to control a circuit for the vertical deflection of a spot scanning a screen, the device comprising:
- an output amplifier stage receiving power from a main power supply for the vertical scanning control;
- and
- an auxiliary power supply for generating an overvoltage at the vertical deflection circuit for the fast flyback of the spot;
- wherein the output amplifier stage operates at a rate of a switching signal called a first switching signal;
- wherein the auxiliary power supply is a switching voltage generation circuit whose switching signal, called a second switching signal, is synchronous with the first switching signal.
A device to control a circuit for the deflection of a spot scanning a screen, the device comprising:
- an output amplifier stage receiving power from a main power supply for the scanning control, the output amplifier stage operating at a rate of a switching signal called a first switching signal;
- and
- an auxiliary power supply formed from a switching voltage generation circuit for generating an over voltage at the deflection circuit for the fast flyback of the spot, the switching voltage generation circuit comprising:
- a second switching signal which is synchronous with the first switching signal;
- an output terminal to deliver the over voltage;
- an inductive element series-mounted with a switch between a first terminal of the main power supply and a second terminal of the main power supply;
- a capacitive element connected between the output terminal and the second terminal of the main power supply;
- and
- a diode whose anode is connected to an intermediate point between the inductive element and the switch and whose cathode is connected to the output terminal and a switch control circuit to deliver the second switching signal designed to control the state of the switch, the second switching signal being synchronous with the first switching signal.
Dependencies are inferred from the claim text.