Back scattering ray source

Abstract

The utility model provides a back scattering ray source, and belongs to the technical field of X-rays. The back scattering ray source comprises a first circuit board printed with a first voltage doubling rectifying circuit and a second circuit board printed with a second voltage doubling rectifying circuit, the first circuit board and the second circuit board are integrally arranged in parallel, and the starting end of the first voltage doubling rectifying circuit corresponds to the ending end of the second voltage doubling rectifying circuit. The tail end of the first voltage-multiplying rectifying circuit corresponds to the starting end of the second voltage-multiplying rectifying circuit, and the starting end of the first voltage-multiplying rectifying circuit and the starting end of the second voltage-multiplying rectifying circuit are both used for being connected with the secondary output end of the transformer. The back scattering ray source is stable and reliable, discharge between circuits can be effectively simulated, and the service life is longer.

Description

Technical Field

[0001] The utility model belongs to the technical field of X-rays, and in particular relates to a backscattered ray source. Background Art

[0002] The backscattered radiation source consists of a high-voltage generator and an X-ray tube. The high-voltage generator outputs a high-voltage DC voltage to create a high-voltage electric field. Once the X-ray tube filament is activated, the electrons, under the influence of the high-voltage electric field, are oriented in a fixed emission direction. These electrons then strike the target surface, generating X-rays. These X-rays can be used for nondestructive testing of the interior of objects and are widely used in various fields, including medical care, security inspections, and industrial flaw detection. During the X-ray generation process, the electric field strength created by the high-voltage power supply directly affects the resistance of components located throughout the circuit board. Uneven electric field strength across the board can easily damage components. Preventing component damage caused by uneven electric field strength distribution is an urgent issue. Summary of the Invention

[0003] In view of this, the present invention addresses the deficiencies of the prior art and proposes a backscattered ray source with a uniformly distributed electric field.

[0004] The purpose of the present utility model can be achieved through the following technical solutions: a backscattered ray source, characterized in that it includes a first circuit board printed with a first voltage-doubling rectifier circuit and a second circuit board printed with a second voltage-doubling rectifier circuit, the first circuit board and the second circuit board are arranged in parallel as a whole, and the starting end of the first voltage-doubling rectifier circuit corresponds to the ending end of the second voltage-doubling rectifier circuit, the ending end of the first voltage-doubling rectifier circuit corresponds to the starting end of the second voltage-doubling rectifier circuit, and the starting end of the first voltage-doubling rectifier circuit and the starting end of the second voltage-doubling rectifier circuit are both used to connect to the secondary output end of the transformer.

[0005] Preferably, the first voltage doubling rectifier circuit includes n capacitors and n diodes, n is an even number greater than 2, the odd-numbered capacitors among the n capacitors are connected in series in sequence and arranged in the first row of the first circuit board, the even-numbered capacitors are connected in series in sequence and arranged in the second row of the first circuit board, the first-numbered capacitor serves as the starting capacitor, and the n-th capacitor serves as the ending capacitor; the first end of the first-numbered capacitor is used to connect to the secondary output end of the transformer, the second end of the first-numbered capacitor is connected to the cathode of the first-numbered diode, the anode of the first-numbered diode is connected to the first end of the second-numbered capacitor, and so on, until the second end of the n-1th capacitor is connected to the cathode of the n-1th diode, the anode of the n-1th diode is connected to the first end of the n-th capacitor, and the second end of the n-th capacitor is connected to the cathode of the n-1th diode, and the anode of the n-1th diode is connected to the second end of the n-1th capacitor.

[0006] Preferably, the second voltage doubling rectifier circuit includes m capacitors and m diodes, m is an even number greater than 2, the odd-numbered capacitors among the m capacitors are connected in series in sequence and arranged in the first row of the second circuit board, the even-numbered capacitors are connected in series in sequence and arranged in the second row of the second circuit board, the first-numbered capacitor serves as the starting capacitor, and the m-th capacitor serves as the ending capacitor; the first end of the first-numbered capacitor is used to connect to the secondary output end of the transformer, the second end of the first-numbered capacitor is connected to the positive electrode of the first-numbered diode, and the negative electrode of the first-numbered diode is connected to the first end of the second-numbered capacitor, and so on, until the second end of the m-1th capacitor is connected to the positive electrode of the m-1th diode, the negative electrode of the m-1th diode is connected to the first end of the m-th capacitor, and the second end of the m-th capacitor is connected to the positive electrode of the m-th diode, and the negative electrode of the m-th diode is connected to the second end of the m-1th capacitor.

[0007] Preferably, the number of capacitors and the number of diodes in the first voltage doubler rectifier circuit and the second voltage doubler rectifier circuit are the same.

[0008] Preferably, the row spacing between the first row of capacitors and the second row of capacitors in the first circuit board and the second circuit board is greater than 6 mm, and an insulating medium is filled between the two rows of capacitors.

[0009] Compared with existing technologies, the present invention has the following features: it is suitable for double-terminal high-voltage power supplies, can form an effective uniformly distributed electric field, and is conducive to reducing the design volume of high-voltage power supplies. It can also be used in the design of portable backscattered radiation sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the structural principle of a backscattered ray source in an embodiment.

[0011] Figure 2 FIG. 4 is a schematic diagram of a first voltage doubling rectifier circuit in an embodiment.

[0012] Figure 3 FIG. 4 is a schematic diagram of a second voltage-doubling rectifier circuit in an embodiment. DETAILED DESCRIPTION

[0013] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0014] like Figure 1As shown, a backscattered ray source provided by the present invention includes a first circuit board printed with a first voltage-doubling rectifier circuit and a second circuit board printed with a second voltage-doubling rectifier circuit. The first circuit board and the second circuit board are arranged in parallel as a whole, and the starting end IN of the first voltage-doubling rectifier circuit corresponds to the ending end OUT of the second voltage-doubling rectifier circuit, and the ending end OUT of the first voltage-doubling rectifier circuit corresponds to the starting end IN of the second voltage-doubling rectifier circuit. The starting end of the first voltage-doubling rectifier circuit and the starting end IN of the second voltage-doubling rectifier circuit are both used to connect to the secondary output end of the transformer.

[0015] The first voltage doubling rectifier circuit includes n capacitors and n diodes, where n is an even number greater than 2. Figure 2 As shown, in this embodiment, the number of capacitors and diodes is preferably 32, with the capacitors being sequentially numbered C1, C2, ..., C32; and the diodes being sequentially numbered U1, U2, ..., U32. The odd-numbered capacitors are sequentially connected in series and arranged in the first row of the first circuit board, while the even-numbered capacitors are sequentially connected in series and arranged in the second row of the first circuit board. The first-numbered capacitor serves as the starting capacitor, and the 32nd-numbered capacitor serves as the ending capacitor. The first end of the first-numbered capacitor is connected to the secondary output of the transformer, the second end of the first-numbered capacitor is connected to the cathode of the first-numbered diode, and the anode of the first-numbered diode is connected to the first end of the second-numbered capacitor, and so on, until the second end of the 31st-numbered capacitor is connected to the cathode of the 31st-numbered diode, the anode of the 31st-numbered diode is connected to the first end of the 32nd-numbered capacitor, and the second end of the 32nd capacitor is connected to the cathode of the 32nd-numbered diode, while the anode of the 32nd-numbered diode is connected to the second end of the 31st capacitor.

[0016] like Figure 3 As shown, to ensure uniform electric field distribution, this embodiment adopts a symmetrical structure. That is, the second voltage-doubling rectifier circuit also includes 32 capacitors and 32 diodes. The capacitors are sequentially numbered C1', C2', ..., C32'; the diodes are sequentially numbered U1', U2', ..., U32'. The odd-numbered capacitors are sequentially connected in series and arranged in the first row of the second circuit board. The even-numbered capacitors are sequentially connected in series and arranged in the second row of the second circuit board. The first-numbered capacitor serves as the starting capacitor, and the 32nd-numbered capacitor serves as the ending capacitor. The first end of the first-numbered capacitor is used to connect to the secondary output end of the transformer, the second end of the first-numbered capacitor is connected to the anode of the first-numbered diode, and the cathode of the first-numbered diode is connected to the first end of the second-numbered capacitor, and so on, until the second end of the 31st-numbered capacitor is connected to the anode of the 31st-numbered diode, the cathode of the 31st-numbered diode is connected to the first end of the 32nd-numbered capacitor, and the second end of the 32nd-numbered capacitor is connected to the anode of the 32nd-numbered diode, and the cathode of the 32nd-numbered diode is connected to the second end of the 31st capacitor.

[0017] In order to ensure good insulation so that the circuit can be stable, reliable and have a longer service life, in this embodiment, the row spacing between the first row of capacitors and the second row of capacitors in the first circuit board and the second circuit board is set to be greater than 6 mm, and an insulating medium is filled between the two rows of capacitors.

[0018] The principle of this utility model is as follows:

[0019] For the first voltage doubling rectifier circuit, when the transformer input voltage is in the first negative half-cycle, diode U1 is turned on and the other diodes are turned off, and capacitor C1 is charged until the voltage on capacitor C1 is equal to the power supply voltage. When the input voltage reaches the first positive half-cycle, diode U2 is turned on, and capacitor C2 is charged until the voltage on capacitor C2 is equal to the power supply voltage plus the voltage on capacitor C1, which is equal to twice the transformer output peak voltage. This process is repeated to fully charge each capacitor. Finally, the voltage on capacitor C1 connected to the secondary side of the transformer is the peak value of the transformer secondary output. The voltage on each capacitor in the first row of capacitors C3, C5, C7...C31 is twice the peak voltage, and the voltage on each capacitor in the second row of capacitors C2, C4, C6...C32 is equal to twice the transformer output peak voltage.

[0020] For the second voltage-doubling rectifier circuit, during the first negative half-cycle of the transformer input voltage, diode U2' is turned on, while the other diodes are cut off, and capacitor C2' is charged until its voltage equals the power supply voltage. During the first positive half-cycle of the input voltage, diode U1' is turned on, and capacitor C1' is charged until its voltage equals the power supply voltage plus the capacitor voltage, which is equal to twice the transformer output peak voltage. This process repeats to fully charge each capacitor. Ultimately, the voltage on capacitor C1' connected to the secondary side of the transformer is the peak value of the transformer's secondary output. The voltage on each capacitor in the upper row of capacitors C3', C5', C7'...C31' is twice the peak voltage, and the voltage on each capacitor in the lower row of capacitors C2', C4', C6'...C32' is equal to twice the transformer output peak voltage.

[0021] The utility model forms a uniform electric field by arranging the first voltage-doubling rectifier circuit and the second voltage-doubling rectifier circuit relatively parallel and symmetrically, effectively simulating the discharge between the circuits, protecting the circuits and increasing the service life of the circuits; at the same time, the upper and lower rows of capacitors in each circuit are connected in series, and the spacing between the upper and lower capacitors is required to be more than 6 mm, which is conducive to filling the insulating medium, thereby improving the stability and reliability of the circuit.

[0022] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

Claims

1. A backscattered ray source, characterized by printing There is a first circuit board with a first voltage-doubling rectifier circuit and a second circuit board printed with a second voltage-doubling rectifier circuit. The first circuit board and the second circuit board are arranged in parallel as a whole, and the starting end of the first voltage-doubling rectifier circuit corresponds to the ending end of the second voltage-doubling rectifier circuit, and the ending end of the first voltage-doubling rectifier circuit corresponds to the starting end of the second voltage-doubling rectifier circuit. The starting end of the first voltage-doubling rectifier circuit and the starting end of the second voltage-doubling rectifier circuit are both used to connect to the secondary output end of the transformer.

2. A backscattered ray source according to claim 1, characterized in that: The first voltage doubling rectifier circuit includes n capacitors and n diodes, where n is an even number greater than 2. The odd-numbered capacitors among the n capacitors are connected in series in sequence and arranged in the first row of the first circuit board, and the even-numbered capacitors are connected in series in sequence and arranged in the second row of the first circuit board. The first-numbered capacitor serves as the starting capacitor, and the n-th capacitor serves as the ending capacitor. The first end of the first-numbered capacitor is used to connect to the secondary output end of the transformer, the second end of the first-numbered capacitor is connected to the cathode of the first-numbered diode, and the anode of the first-numbered diode is connected to the first end of the second-numbered capacitor, and so on, until the second end of the n-1th capacitor is connected to the cathode of the n-1th diode, the anode of the n-1th diode is connected to the first end of the n-1th capacitor, and the second end of the n-th capacitor is connected to the cathode of the n-1th diode, and the anode of the n-1th diode is connected to the first end of the n-1th capacitor, and the second end of the n-th capacitor is connected to the cathode of the n-1th diode, and the anode of the n-1th diode is connected to the second end of the n-1th capacitor.

3. The backscattered ray source according to claim 1, characterized in that: The second voltage doubling rectifier circuit includes m capacitors and m diodes, where m is an even number greater than 2. The odd-numbered capacitors among the m capacitors are connected in series in sequence and arranged in the first row of the second circuit board, and the even-numbered capacitors are connected in series in sequence and arranged in the second row of the second circuit board. The first-numbered capacitor serves as the starting capacitor, and the m-th capacitor serves as the ending capacitor. The first end of the first-numbered capacitor is used to connect to the secondary output end of the transformer, the second end of the first-numbered capacitor is connected to the positive electrode of the first-numbered diode, and the negative electrode of the first-numbered diode is connected to the first end of the second-numbered capacitor, and so on, until the second end of the m-1th capacitor is connected to the positive electrode of the m-1th diode, the negative electrode of the m-1th diode is connected to the first end of the m-th capacitor, and the second end of the m-th capacitor is connected to the positive electrode of the m-th diode, and the negative electrode of the m-th diode is connected to the second end of the m-1th capacitor.

4. The backscattered ray source according to claim 3, characterized in that: The number of capacitors and the number of diodes in the first voltage doubler rectifier circuit and the second voltage doubler rectifier circuit are the same.

5. A backscattered ray source according to claim 3 or 4, characterized in that: The row distance between the first row of capacitors and the second row of capacitors in the first circuit board and the second circuit board is greater than 6 mm, and an insulating medium is filled between the two rows of capacitors.

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