Voltage stabilizer for a high-voltage generating circuit

Claim 2

In a voltage stabilizer for a high-voltage generating circuit comprising: (1) a high-voltage generating circuit having a fly-back transformer, a high-voltage output transistor of which the collector is connected to a first terminal of the primary coil of the fly-back transformer, a resonance capacitor connected in parallel with said high-voltage output transistor, an inverse current absorbing capacitor connected to a second terminal of the primary coil of said fly-back transformer, and a rectifier connected in series with the secondary coil of said fly-back transformer; (2) a detector circuit which is connected to the output terminal of said high-voltage generating circuit, and which detects the voltage produced by said high-voltage generating circuit; (3) a reference voltage source which generates a reference voltage; (4) control means which is connected to said high-voltage generating circuit, said reference voltage source, and to said detector circuit, and which so controls the power source voltage applied to the primary coil of said fly-back transformer that the difference between the reference voltage and the detected voltage is minimized; and (5) a power source which is connected to said control means; the improvement wherein said control means comprises: a. a control transistor of the common-emitter PNP type of which the collector is connected to the second terminal of the primary coil of said fly-back transformer, and of which the emitter is connected to said power source; and b. a differential amplifier circuit having a first transistor of which the base is connected to said reference voltage source and of which the collector is connected to the base of said control transistor, a second transistor of which the base is connected to said detector circuit and of which the emitter is connected to the emitter of said first transistor, and a resistor connected between the collector of said first transistor and said power source, wherein the capacitance of said inverse current absorbing capacitor is selected to be sufficiently small to generate a voltage with a parabolic waveform.

Claim 3

A voltage stabilizer for a high-voltage generating circuit according to claim 1, wherein the capacity of said inverse current absorbing capacitor is selected within a range in which the voltage across the terminals of said inverse current absorbing capacitor does not exceed the base voltage of said control transistor.

Claim 4

A voltage stabilizer for a high-voltage generating circuit according to claim 1, wherein said control circuit has a diode, the anode thereof being connected to the collector of said control transistor and the cathode thereof being connected to said inverse current absorbing capacitor.

Claim 5

A voltage stabilizer for a high-voltage generating circuit according to claim 3, wherein the capacity of said inverse current absorbing capacitor is selected within a range in which the voltage across the terminals of said inverse current absorbing capacitor does not exceed the base voltage of said control transistor.

Claim 6

A voltage stabilizer for a high-voltage generating circuit comprising: (1) a high-voltage generating circuit having a fly-back transformer, a high-voltage output transistor of which the collector is connected to a first terminal of the primary coil of the fly-back transformer, a resonance capacitor connected in parallel with said high-voltage output transistor, an inverse current absorbing capacitor connected to a second terminal of the primary coil of said fly-back transformer, and a rectifier connected in series with the secondary coil of said fly-back transformer; (2) a detector circuit which is connected to the output terminal of said high-voltage generating circuit, and which detects the voltage produced by said high-voltage generating circuit; (3) a reference voltage source which generates a reference voltage; (4) control means which is connected to said high-voltage generating circuit, said reference voltage source, and to said detector circuit, and which so controls the power source voltage applied to the primary coil of said fly-back transformer that the difference between the reference voltage and the detected voltage is minimized; and (5) a power source which is connected to said control means; the improvement wherein said control means comprises: a. a control transistor of the common-emitter type of which the collector is connected to the second terminal of the primary coil of said fly-back transformer, and of which the emitter is connected to said power source; and b. a differential amplifier circuit having a first transistor of which the base is connected to said reference voltage source and of which the collector is connected to the base of said control transistor, a second transistor of which the base is connected to said detector circuit and of which the emitter is connected to the emitter of said first transistor, and a resistor connected between the collector of said first transistor and said power source, wherein said control circuit has a diode, the anode thereof being connected to the collector of said control transistor and the cathode thereof being connected to said inverse current absorbing capacitor, and wherein said control circuit has a second control transistor which is connected in series with said control transistor.

Claim 7

A voltage stabilizer for a high-voltage generating circuit comprising: (1) a high-voltage generating circuit having a fly-back transformer, a high-voltage output transistor of which the collector is connected to a first terminal of the primary coil of the fly-back transformer, a resonance capacitor connected in parallel with said high-voltage output transistor, an inverse current absorbing capacitor connected to a second terminal of the primary coil of said fly-back transformer, and a rectifier connected in series with the secondary coil of said fly-back transformer; (2) a detector circuit which is connected to the output terminal of said high-voltage generating circuit, and which detects the voltage produced by said high-voltage generating circuit; (3) a reference voltage source which generates a reference voltage; (4) control means which is connected to said high-voltage generating circuit, said reference voltage source, and to said detector circuit, and which so controls the power source voltage applied to the primary coil of said fly-back transformer that the difference between the reference voltage and the detected voltage is minimized; and (5) a power source which is connected to said control means; the improvement wherein said control means comprises: a. a control transistor of the common-emitter type of which the collector is connected to the second terminal of the primary coil of said fly-back transformer, and of which the emitter is connected to said power source; and b. a differential amplifier circuit having a first transistor of which the base is connected to said reference voltage source and of which the collector is connected to the base of said control transistor, a second transistor of which the base is connected to said detector circuit and of which the emitter is connected to the emitter of said first transistor, and a resistor connected between the collector of said first transistor and said power source, wherein said control circuit has a diode, the anode thereof being connected to the collector of said control transistor and the cathode thereof being connected to said inverse current absorbing capacitor, and wherein said control circuit has a second control transistor which is connected in series with said control transistor.

Claim 8

In a voltage stabilizer for a high voltage generating circuit comprising: (1) a high-voltage generating circuit having a fly-back transformer, a high-voltage output transistor of which the collector is connected to a first terminal of the primary coil of the fly-back transformer, a resonance capacitor connected in parallel with said high-voltage output transistor, an inverse current absorbing capacitor connected to a second terminal of the primary coil of said fly-back transformer, and a rectifier connected in series with the secondary coil of said fly-back transformer; (2) a detector circuit which is connected to the output terminal of said high-voltage generating circuit, and which detects the voltage produced by said high-voltage generating circuit; (3) a reference voltage source which generates a reference voltage; (4) control means which is connected to said high-voltage generating circuit, said reference voltage source, and to said detector circuit, and which so controls the power source voltage applied to the primary coil of said fly-back transformer that the difference between the reference voltage and the detected voltage is minimized; and (5) a power source which is connected to said control means; the improvement wherein said control means comprises: a first control circuit made up of; a. a control transistor of the common-emitter type of which the collector is connected to the first terminal of said fly-back transformer and of which the emitter is connected to said power source; and b. a differential amplifier circuit having a first transistor of which the base is connected to said reference voltage source and of which the collector is connected to the base of said control transistor, a second transistor of which the base is connected to said detector circuit and of which the emitter is connected to the emitter of said first transistor, and a resistor connected between the collector of said first transistor and said power source; and a second control circuit having a second detector circuit that is connected to said fly-back transformer and said first control circuit to detect a high-voltage output current flowing through the secondary coil of said fly-back transformer, in order to control the base voltage of the control transistor of said first control circuit depending upon the detected output.

Claim 9

In a voltage stabilizer for a high voltage generating circuit comprising: (1) a high-voltage generating circuit having a fly-back transformer, a high-voltage output transistor of which the collector is connected to a first terminal of the primary coil of the fly-back transformer, a resonance capacitor connected in parallel with said high-voltage output transistor, an inverse current absorbing capacitor connected to a second terminal of the primary coil of said fly-back transformer, and a rectifier connected in series with the secondary coil of said fly-back transformer; (2) a detector circuit which is connected to the output terminal of said high-voltage generating circuit, and which detects the voltage produced by said high-voltage generating circuit; (3) a reference voltage source which generates a reference voltage; (4) control means which is connected to said high-voltage generating circuit, said reference voltage source, and to said detector circuit, and which so controls the power source voltage applied to the primary coil of said fly-back transformer that the difference between the reference voltage and the detected voltage is minimized; and (5) a power source which is connected to said control means; the improvement wherein said control means comprises: a first control circuit made up of; a. a control transistor of the common-emitter type of which the collector is connected to the first terminal of said fly-back transformer and of which the emitter is connected to said power source; and b. a differential amplifier circuit having a first transistor of which the base is connected to said reference voltage source and of which the collector is connected to the base of said control transistor, a second transistor of which the base is connected to said detector circuit and of which the emitter is connected to the emitter of said first transistor, and a resistor connected between the collector of said first transistor and said power source; and a second control circuit having a second detector circuit that is connected to said fly-back transformer and said first control circuit to detect a high-voltage output current flowing through the secondary coil of said fly-back transformer, in order to control the base voltage of the control transistor of said first control circuit depending upon the detected output.

Claim 10

A voltage stabilizer for a high-voltage generating circuit according to claim 6, wherein the capacity of said inverse current absorbing capacitor is selected within a range in which the voltage across the terminals of said inverse current absorbing capacitor does not exceed the base voltage of said control transistor.

Claim 11

A voltage stabilizer for a high-voltage generating circuit according to claim 7, wherein said second control circuit has a differentiation circuit for differentiating said high-voltage output current.

Claim 12

A voltage stabilizer for a high-voltage generating circuit according to claim 8, wherein the output terminal of said second control circuit is connected to the base of said control transistor.

Claim 13

A voltage stabilizer for a high-voltage generating circuit according to claim 8, wherein the output terminal of said second control circuit is connected to the base of said second transistor.

Claim 14

A voltage stabilizer for a high-voltage generating circuit according to claim 8, wherein said reference voltage source has a voltagecontrolled constant-voltage circuit, and the output terminal of said second control circuit is connected to the control input terminal of said voltage-controlled constant-voltage circuit.