Power output stage for the control of plasma screen cells
First Claim
1. A power output stage for the control of plasma screen cells, comprising:
- an input for receiving a low voltage logic input signal, a control output for issuing a high voltage output control signal, and an output circuit including a charge transistor receiving a high voltage potential on a drain and having a source connected to the control output and a discharge transistor receiving a reference potential on a source and having a drain connected to the control output, and a control circuit issuing control signals to the charge and discharge transistors to control these transistors according to the logic input signal, wherein the charge and discharge transistors are of N-channel VDMOS type, the charge transistor being arranged to form a compound P-type transistor, and wherein the control circuit is arranged so that a potential of a control gate of the charge transistor drops more rapidly than the output potential when the logic input signal controls a discharge of the control output.
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Accused Products
Abstract
The present invention relates to a power output stage for the control of plasma screen cells. It includes VDMOS-type N-channel charge and discharge transistors, the charge transistor being arranged to form a compound P-channel transistor. These transistors enable to issue a charge current to an output and to absorb a discharge current from this output. Two inverters are sized so that the potential of the control gate of the charge transistor drops more rapidly than the output potential when a discharge of this output is controlled. Thus, an output stage of limited bulk and without any risk of simultaneous conduction of the charge and discharge transistors is implemented.
24 Citations
17 Claims
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1. A power output stage for the control of plasma screen cells, comprising:
an input for receiving a low voltage logic input signal, a control output for issuing a high voltage output control signal, and an output circuit including a charge transistor receiving a high voltage potential on a drain and having a source connected to the control output and a discharge transistor receiving a reference potential on a source and having a drain connected to the control output, and a control circuit issuing control signals to the charge and discharge transistors to control these transistors according to the logic input signal, wherein the charge and discharge transistors are of N-channel VDMOS type, the charge transistor being arranged to form a compound P-type transistor, and wherein the control circuit is arranged so that a potential of a control gate of the charge transistor drops more rapidly than the output potential when the logic input signal controls a discharge of the control output. - View Dependent Claims (2, 3, 4)
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5. A power output circuit for converting a logic signal of a low voltage to an output signal of a high voltage, the power output circuit comprising:
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an input terminal coupled to receive the logic signal; an output terminal; a charge transistor of a first conductivity type having a first terminal coupled to a high voltage source, a second terminal coupled to the output terminal, and a control terminal; a discharge transistor of the first conductivity type having a first terminal coupled to the output terminal, a second terminal coupled to a low voltage source, and a control terminal; a control circuit for controlling a conductive state of the charge transistor and the discharge transistor, the control circuit having an input coupled to the input terminal, a first output coupled to the control terminal of the charge transistor, and a second output coupled to the control terminal of the discharge transistor, the control circuit being structured to render the charge transistor non-conductive before rendering the discharge transistor conductive and to render the discharge transistor non-conductive before rendering the charge transistor conductive based on the logic signal to alternately couple the output terminal to either the high voltage source or the low voltage source. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for converting a logic signal of a low voltage to an output signal at a high voltage, the method comprising:
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generating a plurality of delayed control signals based on the logic signal; rendering a high side transistor of a first conductivity type conductive with one of the control signals to couple a high voltage source to an output terminal; rendering the high side transistor non-conductive with one of the control signals; rendering a low side transistor of the first conductivity type conductive with one of the control signals to couple a low voltage source to the output terminal after the high side transistor has been rendered non-conductive; and rendering the low side transistor non-conductive with one of the control signals. - View Dependent Claims (14, 15, 16, 17)
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Specification