JP2002324697A - High voltage generating circuit of x-ray generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high voltage generating circuit of an X-ray generating device which is easy to manage high voltage power supply and is considered to respond substantially laconically when a trouble is caused by an inferior part or the like. SOLUTION: In an X-ray generating device getting X-ray by accelerated electrons pressurizing DC voltage on an X-ray tube, a plurality of boosting/ dividing modules 10 made of blocks of an appropriate minimum unit for a circuit function are equipped, the plurality of boosting/dividing modules 10 connected in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-voltage generating circuit of an X-ray generator for generating X-rays by applying electrons accelerated by applying a DC voltage to an X-ray tube.

[0002]

2. Description of the Related Art Conventionally, in order to emit stable X-rays in an X-ray generator using this type of X-ray tube,
A high voltage of DC is applied between the anode or the anode and the cathode to accelerate thermoelectrons in the X-ray tube.

FIG. 2 is a circuit diagram of a high-voltage generation circuit used in a conventional X-ray generator, that is, a high-voltage generation circuit including a Cockcroft rectification circuit and a high-voltage detection circuit. The AC voltage supplied from the unit 1 is boosted by the boosting transformer 2 and supplied to the boosting unit 3.

The boosting unit 3 is composed of a Cockcroft rectification circuit 6 composed of a diode 4 and a capacitor 5, performs rectification and boosting, and supplies a high voltage to an X-ray tube 7, thereby generating X-rays. .

The high voltage obtained in the final stage 6A of the Cockcroft rectification circuit 6 is subjected to error correction in real time. The error is detected by a high voltage detection circuit 9 comprising a voltage dividing resistor 8, and the detection result is obtained. Is corrected by a setting comparison circuit (not shown) of the high-voltage control unit 1, and
The corrected result is supplied to the booster unit 3 as a feedback signal.

Since a high voltage is always applied to the boosting unit 3 and the high voltage detecting circuit 8 during operation, it is necessary to maintain the dielectric strength and prevent the stability from being reduced by external vibrations. Each of the voltage dividing resistors 8 is molded as one block, and has a circuit configuration operated under a highly insulating environment.

[0007]

However, in such a conventional technique, since the Cockcroft rectifier circuit 6 and the high-voltage detection circuit 9 are formed by connecting the same circuit repeatedly in series, the discharge of the X-ray tube 7 or the parts When a failure occurs in an internal part due to initial failure or deterioration, special equipment that can seal or shut off the generated high voltage is required to identify the failure part, and as a result, the equipment becomes large-scale As a result, there was a problem that the economic burden was large and it was not realistic.

[0008] Another problem after the completion of molding the Cockcroft rectifier circuit 6 and the voltage dividing resistor 9 as one block is that the molded block is not necessarily the minimum unit, so that only a defective part is used. In addition, there has been a problem that parts cannot be replaced, and even usable parts are discarded.

Further, in the energization test after the completion of the assembly, the performance must be confirmed at the applied actual voltage. However, the application of a high voltage to the air is limited, and various evaluation tests are restricted. The problem had occurred.

Further, the X-ray tube deteriorates as it is used, and discharge occurs in the course of failure. However, the surge of this discharge cannot be completely protected by the conventional circuit system.

SUMMARY OF THE INVENTION An object of the present invention is to provide an X-ray generator which is easy to handle a high voltage power supply, and is capable of fully coping with a wasteful operation even when a failure occurs due to a defective component or the like. It is to provide a high voltage generation circuit.

[0012]

According to the present invention, there is provided a high voltage generating circuit for an X-ray generator, comprising: an X-ray generating apparatus which obtains X-rays from electrons accelerated by applying a DC voltage to an X-ray tube and accelerated; Multiple boosting /
A voltage dividing module is provided, and the plurality of step-up / voltage dividing modules are connected in series.

In the high-voltage generating circuit of the X-ray generator according to the present invention, a voltage dividing resistor is built in the plurality of step-up / voltage dividing modules.

Further, in the high voltage generating circuit of the X-ray generator according to the present invention, a voltage detecting circuit for stabilizing the DC voltage obtained by the Cockcroft circuit by feedback control in the plurality of step-up / voltage dividing modules. Is incorporated.

Further, in the high voltage generating circuit of the X-ray generator according to the present invention, each of the plurality of step-up / voltage dividing modules is individually molded.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a circuit diagram showing a high-voltage generating circuit of an X-ray generator according to the present invention. The same components as those in FIG. 2 are denoted by the same reference numerals, and the detailed description thereof will be omitted. The description will be omitted, and only the components different from those in FIG. 2 will be mainly described below.

In FIG. 1, an AC voltage supplied from a high voltage control unit 1 is boosted by a step-up transformer 2 and supplied to a step-up / voltage dividing module 10 according to the present invention.

The step-up / divider module 10 is divided into one block by a minimum unit corresponding to a necessary generated voltage and connected in series with each other. And a voltage dividing resistor 8 for dividing a high voltage.

The one-block boost / divide module 10 is molded with an epoxy resin and has a circuit configuration provided as one unit of a circuit.

In such a circuit configuration, the generated voltage shared by the boosting / voltage dividing module 10 in one block is constant, and the generated voltage required by the boosting / voltage dividing module 10 is connected in series. As a result, an optimum operating voltage according to the load, that is, the application of the X-ray tube 7 is obtained, and the shared voltage of the step-up / voltage dividing module 10 is suppressed to a voltage which can be sufficiently applied in the air. Therefore, power can be supplied to and evaluated by the module alone of the step-up / voltage-dividing module 10.

[0022]

According to the present invention described above, the step-up / voltage-dividing module is divided into one block with the minimum unit of the required voltage, so that even if a defect occurs in the circuit, the discarded portion is minimized. In addition, no special equipment for specifying a defective portion is required, and as a result, a high-voltage generating circuit which is economically advantageous without waste can be obtained.

Further, according to the present invention, an optimum working voltage suitable for the use of the X-ray tube as a load is provided.
It is possible to evaluate the booster / divider module 7 alone, and the circuit can be completely protected from a discharge surge generated in a process leading to a failure.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a high voltage generating circuit of an X-ray generator according to the present invention.

FIG. 2 is a circuit configuration diagram showing a high voltage generation circuit of a conventional X-ray generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-voltage control unit 2 Step-up transformer 3 Step-up unit 4 Diode 5 Capacitor 6 Cockcroft rectifier circuit 6A Final stage of Cockcroft rectifier circuit 7 X-ray tube 8 Voltage dividing resistor 9 High voltage detecting circuit 10 Step-up / voltage dividing module

Claims (4)

[Claims] 1. An X-ray generator for obtaining X-rays from electrons accelerated by applying a DC voltage to an X-ray tube, comprising: a plurality of step-up / voltage-down modules in which a minimum unit optimal for a circuit function is divided into one block. A high voltage generating circuit for an X-ray generator, comprising: a plurality of step-up / voltage dividing modules connected in series. 2. The X according to claim 1, wherein a voltage dividing resistor is built in said plurality of step-up / voltage dividing modules.
High voltage generation circuit of line generator. 3. The method according to claim 2, wherein the plurality of step-up / partition modules include:
2. The high voltage generating circuit according to claim 1, further comprising a voltage detecting circuit for stabilizing a DC voltage obtained by the Cockcroft circuit by feedback control. 4. The high-voltage generating circuit according to claim 1, wherein each of the plurality of step-up / voltage dividing modules is individually molded.