Magnetic deflection amplifier utilizing both positive and negative voltage supplies for high-speed deflection

Claim 2

A deflection system for a cathode-ray tube employing a single magnetic deflection coil to position the beam of the cathode-ray tube along one coordinate, the combination comprising an operational amplifier havinG its input connected to receive signals for positioning the cathode-ray tube beam along said one coordinate, the output of said operational amplifier supplying current to said deflection coil; feedback means for providing a voltage representative of the current through said deflection coil to the input of said operational amplifier; a first source of voltage supplying current to said deflection coil through said operational amplifier; an inductance for supplying a second higher source of voltage to said deflection coil through said operational amplifier; switch means for causing said inductance to supply said higher voltage when the output of said operational amplifier obtains a predetermined value thus providing an additional source of current to said deflection coil to move said beam quickly to a desired position on said cathode-ray tube face.

Claim 3

The deflection circuit of claim 1 wherein said inductance is connected in parallel with said first source of voltage; said circuit further including means for providing a low-resistance path through which current from said inductance may pass during periods when the output from said operational amplifier is below said predetermined value, said means opening said low-resistance path under control of said switch means when the output of said operational amplifier obtains said predetermined value thereby allowing the energy stored in said inductance to be transferred to said deflection coil thus to move the cathode-ray tube beam quickly to a desired position.

Claim 4

The deflection circuit of claim 1 wherein said inductance is connected in series with said deflection coil; constant current means in series with said inductance; said operational amplifier controlling the current flow through said deflection coil in one direction by varying the combined current from said coil and said inductance; said inductance providing a high voltage across said deflection coil to cause current to flow in the opposite direction under control of said switch means when the output of said operational amplifier obtains a predetermined value.

Claim 5

A cathode-ray deflection circuit of the type employing a single magnetic deflection coil to position a cathode-ray tube beam along one coordinate, the combination comprising an operational amplifier having its input connected to a voltage source which controls the position of the cathode-ray tube beam, the output of said operational amplifier connected to supply current through said deflection coil; feedback means for providing a voltage representative of the current through said deflection coil to the input of said operational amplifier; a first source of positive voltage connected to said deflection coil through said operational amplifier; a second source of positive voltage, greater in magnitude than said first source; first switch means responsive to the voltage output from said operational amplifier for connecting said second source of positive voltage to said operational amplifier whenever the positive magnitude of the output voltage of said operational amplifier exceeds a predetermined value; a first source of negative voltage connected to said deflection coil through said operational amplifier; a second source of negative voltage, greater in magnitude than said first source of negative voltage; and second switch means responsive to the output from said operational amplifier for connecting said second source of negative voltage to said operational amplifier whenever the negative magnitude of the output voltage of said operational amplifier exceeds a predetermined value.

Claim 6

A cathode-ray deflection circuit of the type employing a single magnetic deflection coil to position a cathode-ray tube beam along one coordinate, the combination comprising an operational amplifier having its input connected to a voltage source which controls the position of the cathode-ray tube beam, the output of said operational amplifier connected to supply current through said deflection coil; feedback means for providing a voltage representative of the current through said deflection coil to the input of said operational amplifier; a first source of positive voltage connected to said deflection coil through said operational amplifier; a second source of positive voltage, greater in magnitude than said first source; first switch means responsive to the voltage output from said operational amplifier for connecting said second source of positive voltage to said operational amplifier whenever the positive magnitude of the output voltage of said operational amplifier exceeds a predetermined value; a first source of negative voltage connected to said deflection coil through said operational amplifier; a second source of negative voltage, greater in magnitude than said first source of negative voltage; and second switch means responsive to the output from said operational amplifier for connecting said second source of negative voltage to said operational amplifier whenever the negative magnitude of the output voltage of said operational amplifier exceeds a predetermined value.

Claim 7

The deflection circuit of claim 4 wherein said second source of positive voltage and said second source of negative voltage each includes an inductor connected in parallel thereacross; said circuit further including means for providing a low-resistance path through which current from said inductor may pass, said means opening said low-resistance pAth under control of said first switch means and second switch means when the output from said operational amplifier obtains said predetermined value thereby allowing the energy stored in one of said inductors to be transferred to said deflection coil thus to move the cathode-ray tube beam quickly to a desired position.

Claim 8

A deflection circuit for a cathode-ray tube including a single deflection coil for positioning the beam of the cathode-ray tube along one coordinate axis; an operational amplifier having its input connected to receive signals for positioning the beam along said one coordinate; feedback means for providing a voltage representative of the current through said deflection coil to the input of said operational amplifier; a current supply having a first polarity; a shunt regulator in series between said current supply and said deflection coil, said shunt regulator connected to the output of said operational amplifier thereby to control the current through said deflection coil and thus position the beam; a second current supply having a polarity opposite from the polarity of said first supply; an inductor connected to said deflection coil; and constant current means between said second current supply and said inductor for providing a constant current through said inductor, said current being divided between said deflection coil and said shunt regulator, the energy in said inductor supplying sufficient voltage to said deflection coil to cause rapid change in current in said deflection coil.

Claim 9

A deflection circuit for a cathode-ray tube including a single deflection coil for positioning the beam of the cathode-ray tube along one coordinate axis; an operational amplifier having its input connected to receive signals for positioning the beam along said one coordinate; feedback means for providing a voltage representative of the current through said deflection coil to the input of said operational amplifier; a current supply having a first polarity; a shunt regulator in series between said current supply and said deflection coil, said shunt regulator connected to the output of said operational amplifier thereby to control the current through said deflection coil and thus position the beam; a second current supply having a polarity opposite from the polarity of said first supply; an inductor connected to said deflection coil; and constant current means between said second current supply and said inductor for providing a constant current through said inductor, said current being divided between said deflection coil and said shunt regulator, the energy in said inductor supplying sufficient voltage to said deflection coil to cause rapid change in current in said deflection coil.

Claim 10

The circuit of claim 6 further including switch means in series between said deflection coil and said shunt regulator; said switch means being biased to open and thus permit the energy in said inductor to be transferred to said deflection coil when the required current change through said deflection coil cannot be supplied by said shunt regulator.