JPS60208100A - X-ray generating equipment - Google Patents

Abstract

PURPOSE:To increase frequency of voltage pulse and make equipment compact and light weight by applying high frequency voltage pulse to a high frequency transformer through a resonance circuit from an X-ray generating controller to operate an X-ray tube. CONSTITUTION:A secondary coil C2 of a high voltage transformer TS is divided into several coils, and cascade connection is applied between coils through diodes. A resonance circuit comprising a primary coil of the high voltage transformer TS is arranged in an X-ray generating controller 10 which supplies pulse voltage to the high voltage transformer. High frequency voltage pulse is applied to the transformer TS through the resonance circuit from the controller 10 to operate an X-ray tube 21. By dividing the secondary coil C2 of the transformer TS, and cascade-connecting the coils through diodes 22-1-22-n, iron core is eliminated from the transformer TS. Therefore, frequency of voltage pulse is increased and the equipment is made compact and light weight.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a portable X-ray generator used for non-destructive testing and the like.

[Technical background of the invention]

FIG. 1 is a 4.5 diagram of a conventional portable X-ray generator. This X-ray generator includes an Xa generator 3 comprising an X-ray tube 1 and a high-voltage transformer 2, and an X-ray generator controller 4 that supplies a nocellus voltage to the X-ray generator 3.

The voltage supplied from the power supply 5 is rectified by a rectifier circuit including diodes DI, D2 and thyristors S1, S2 of a rectifier voltage control circuit 6, smoothed by a coil L and a capacitor C, and output as a predetermined voltage.

Then, a Noculus voltage is applied to the primary coil of the high voltage transformer 2 via the low voltage cable 8 by opening and closing the switching element 7 made of a semiconductor or the like at a predetermined period. As a result, a high voltage is applied between the RJ3 pole and the cathode of the X-ray tube 1, and X-rays are generated from the X-ray tube 1.

By the way, the high-voltage transformer 2 has the following configuration. The magnetic path is formed into a closed circuit using an iron core.

In order to prevent saturation due to residual magnetism of the iron core when a -9 russ voltage is applied, a gap of approximately several square meters is provided in the magnetic path. Further, the secondary coil is wound in layers on the primary coil, and the number of layers is tens to hundreds, or more than hundreds. Lumirror paper with high dielectric strength (voltage strength) is used for interlayer insulation between these coils. The thickness of this Lumirror paper is made to be thin within the range allowed by the voltage proof strength due to the dielectric constant force line of this Lumirror paper and the need to downsize the high voltage transformer 2 itself. There is. For this reason, the distributed capacity of the high voltage transformer 20 has become large.

[Problems with background technology]

As described above, if the distributed capacitance of the high voltage transformer 2 is large, the frequency of the voltage pulse applied to the high voltage transformer 2 cannot be increased, and in reality, a voltage pulse having a frequency of 100 to 300 Hz is applied. If the frequency of this voltage/'P pulse can be increased, a high voltage can be obtained in the secondary coil of the high voltage transformer 2, and there are many advantages such as reducing iron loss. It is not possible to take advantage of these advantages.One way to reduce iron loss is to reduce the voltage/gust noise width.

More importantly, since the voltage transformer 7 has the above-mentioned configuration, the weight of the X-ray generating section 3 becomes heavy, especially due to the use of an iron core, and furthermore, a structure is used to support this iron core. Thus, the weight of the entire X-ray generator is quite heavy. Portable X-ray generators are often used in places with poor footing or in narrow spaces, so they are required to be small and lightweight, but conventional devices do not meet this requirement. Become something.

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and its object is to provide an X-ray generator that can increase the frequency of voltage pulses and that can reduce the size and weight of the entire device.

[Summary of the invention]

In the present invention, the secondary coil of a high voltage transformer is divided into a plurality of parts, a diode is inserted between these coils and connected in cascade, and a resonant circuit consisting of the primary coil of this high voltage transformer is used to supply pulse voltage to the high voltage transformer. A high-frequency voltage pulse is applied from the X-ray generation control section to the high-voltage transformer through its resonance circuit, and the high voltage generated in the secondary coil of the high-voltage transformer is used to generate X-rays. It is a non-X-ray generator that generates X-rays by operating a ray tube.

[Embodiments of the invention]

Hereinafter, an example of an X-ray generator according to the present invention will be explained with reference to FIG. 2. Figure 2 is X! It is a block diagram of an evening start stop device. This X-ray generator includes an X-ray generation control section 10
and an X-ray generating section 20, and its specific configuration is as follows. - The X-ray generation control unit 10 converts the power supplied from the commercial power source e into DC and converts the voltage level to the X-ray generation unit 20.
This DC voltage is further converted into a predetermined high-frequency voltage pulse and supplied to the Xa generating section 20. This X-ray generation control section 10 has a rectification voltage control circuit 11. This rectifier voltage control circuit 11 includes diodes DiO, Di1 and a thyristor S10°Sl.
A rectifier circuit consisting of l and a smoothing coil. and a smoothing circuit consisting of a capacitor C8. A series circuit of a switching element J2 made of a semiconductor element or the like and a resonance capacitor C8 is connected to this capacitor C8. Note that the switching element 12 includes a diode D for absorbing the instantaneous voltage generated when the switching element 12 is opened and closed. are connected in parallel. Both ends of the resonance capacitor C8 and the primary coil of the high voltage transformer TB of the X-ray generating section 20 are connected by a low voltage cable 13, and a resonance circuit is formed by the resonance capacitor C8 and the primary coil.

The X-ray generating section 20 is composed of a high voltage transformer Ts and an X-ray tube 2. In particular, the configuration of the high voltage transformer T8 is as follows. This -, f% pressure transformer Tll is an air-core type that does not use an iron core, and SFb gas of 4 to 9/i is sealed in its casing to insulate the high pressure part. Insulation is applied to the outside of the primary coil C1,
The secondary coil C2 is divided into several pieces and wound around the outer circumference of the rim. Furthermore, these divided Koi/I/C2
-1 to C2-n are each divided carp/I/C2-1 to C2-
Diodes 22-1 to 22-n are connected between the terminals 22-n and 22-n, respectively, so that they are each connected in a cast-r configuration. The voltages induced in the divided coils C2-1 to C2-n are added together to form a magnetic voltage appearing in the secondary coil C2 of the high-voltage transformer TS. Therefore, the high voltage transformer T6 has a small distribution volume 1 and is light, heavy, and compact without using an iron core. An X-ray tube 21 is connected between the secondary coils NC2 of the high voltage transformer TB.

Next, the operation of the apparatus configured as described above will be explained. The voltage supplied from the commercial power source e passes through the rectifier circuit and smoothing circuit of the voltage control unit circuit 11 and is converted into a DC voltage having a predetermined voltage level. Therefore, the switching element 12 is controlled to open and close at a predetermined high frequency, so that this DC voltage is converted into a high frequency voltage pulse 4' and applied to the high voltage transformer Ts. Therefore, if the switching element 12 is in the closed state, that is, in the conductive state, the primary coil CIK voltage pulse of the high voltage transformer TB is applied, so that each of the divided coils C2-1 to C2-1 of the high voltage transformer T8 is applied.
A positive voltage is induced in C2-n in the direction of arrow (A), that is, on the end side where the coil winding starts. However, since this voltage is blocked by the diodes 22-1 to 22-n, no high voltage is applied to the X-ray tube 2, which is the load, and no current flows. Therefore, in the primary coil C1 of the high voltage transformer Ts,
Energy equivalent to the supplied power is stored as electromagnetic energy.

When the switching element 12 becomes non-conductive, the electromagnetic energy obtained by the primary coil C11C of the high voltage transformer TB is supplied to the resonance capacitor C6. The t(i pressure Ei applied to the primary coil CI of this and the other) decreases according to a time constant determined by the resonance capacitor CB and the primary coil C1, reaches a negative potential, and further decreases to the maximum value of the negative potential. When the voltage reaches the voltage level, it rises again and returns to the voltage level before falling.In other words, resonance occurs in the circuit composed of the resonance capacitor C8 and the primary coil C1.

Here, during a period when the abrasive pressure Ei applied to the primary coil C1 of the high voltage transformer T8 has a negative potential, a voltage is induced in each of the divided coils C2-1 to C2-n of the high voltage transformer T8 in the direction of the arrow (b). Ru. These voltages are connected to the diodes 22-1 to 22
Since the direction is the same as the forward direction of −n, these diodes 22
-1 to 22-n and are added together and applied to the X-ray tube 2 as the voltage of the secondary coil C2. As a result, X-rays are generated from the X-ray tube 2. However, this secondary coil C2
The voltage induced in is generated when the voltage resonated by the resonance capacitor Cs is applied to the primary coil C1, so it has a value several times higher than the turns ratio of the high voltage transformer T8.

In this way, in the device of the present invention, the high voltage transformer Ts
The secondary coil C2 of is divided into multiple parts, and these divided coils C
Since the diodes 22-1 to 22-n are interposed between the diodes 2-1 to C2-n and connected in cascade, the high voltage transformer T can be made small and lightweight without using an iron core. As a result, the structures and casings for supporting the high-voltage transformer TS can also be made smaller and lighter, making it possible to reduce the N circumference of the entire device. As mentioned above, the 3-type X Mj generator is used, for example, to detect welding defects at welding sites for welding lines and gas tanks, and the sites are often in places with poor footing or in narrow spaces. . Therefore, since the device of the present invention is small and lightweight, it is the most suitable device that satisfies the requirements of the present invention.

Further, by configuring the high voltage transformer T8 as described above, the distributed capacitance of the high voltage transformer T8 becomes small. Therefore, the high-voltage transformer TBVc can apply a high-frequency voltage pulse, specifically a voltage pulse of 10 to 20 kHz, thereby increasing the voltage induced in the secondary coil C2. Shell and chiseling losses can be reduced.

Furthermore, by connecting the resonance capacitor Cs,
A voltage several times larger than the turns ratio of the high voltage transformer Ts is induced in the secondary coil C2 of the high voltage transformer. Therefore, a desired high voltage can be obtained even if the number of turns of the secondary coil C2 is small, and this also makes the 6-volt transformer Ts smaller and lighter.

Note that the present invention is not limited to the above-mentioned actual travel example. For example, there is a method of changing the impedance of the primary coil CI in order to determine the current input to the primary coil C1 of the high voltage transformer Ts. All of them may be inserted.Incidentally, a rod-shaped iron core may be inserted in advance into the 1t6-pressure transformer Ts instead of making it an air core.

Further, even if the resonance capacitor C8 is connected not to both ends of the primary coil C1 but to both ends of the switching element 12 for a long time, it can resonate with the primary coil C1.

〔Effect of the invention〕

According to the present invention, the secondary coil of the high-voltage transformer is divided into a plurality of parts, and a diode is inserted between these coils to connect them in cascade. Furthermore, a resonant circuit consisting of the primary coil of the high-voltage transformer is provided, so that voltage pulses can be generated. It is possible to provide an X-ray generator that can increase the frequency of the X-rays and make the entire device smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional xi generator, and FIG. 2 is a block diagram showing an embodiment of the X-ray generator according to the present invention. DESCRIPTION OF SYMBOLS 10... X-ray generation control section, 1... Rectification voltage fiI control circuit, 12... Switching element, 20... X-ray generation section, 2... X ftbQ tube, Tc... High voltage Transformer, C1... primary coil, C2... secondary coil, C2-1 to C2-n- divided coil, 22-1 to 22-
n-diode, C8...resonant capacitor.

Claims (1)

[Claims] An X-ray system consists of a high-voltage transformer in which an X-ray tube and a secondary coil connected to the X-ray tube are divided into multiple parts, and diodes are inserted between these coils, each of which is connected in a cassette manner.
The X-ray tube has a resonant circuit including a ray generating section and a primary coil of the voltage transformer, and generates X-rays from the X-ray tube by applying a high-frequency Glucos voltage to the primary coil of the high-voltage transformer. An X-ray generator characterized by integrally comprising an X-ray generation control section.