Micro-focus radiation source

Abstract

The utility model provides a micro-focus radiation source, and belongs to the technical field of X-ray sources. The microfocus radiation source comprises a first input end, a second input end and at least two voltage-multiplying modules, the multiple voltage-multiplying modules are sequentially connected in series, the input end of the first voltage-multiplying module is connected to a transformer through the first input end and the second input end, and the output end of the last voltage-multiplying module outputs voltage signals. And the polarity of the odd-numbered voltage-multiplying modules is opposite to that of the even-numbered voltage-multiplying modules. According to the device, the withstand voltage value of each stage of the high-voltage voltage doubling plate can be effectively improved, the overall voltage tolerance is greatly improved, the output voltage is higher, the cost is reduced, the efficiency is improved, the service life of components is prolonged, and the stability and the reliability of a circuit are improved.

Description

Technical Field

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

[0002] X-ray tubes, as X-ray output sources, generate X-rays that can be used for nondestructive testing of internal objects. They are widely used in various fields, including medicine, security inspection, and industrial flaw detection. An X-ray source consists of a high-voltage generator and an X-ray tube. The high-voltage generator outputs a high DC voltage, which powers the X-ray tube to emit electrons. These electrons impact the target surface, generating X-rays. For X-ray high-voltage power supplies that output high voltage and low current, a voltage-doubling rectifier is typically used to boost the voltage to the required level. The output voltage is typically dependent on the transformer parameters and the number of stages in the voltage-doubling circuit. In high-voltage output applications, the transformer has a higher turns ratio, resulting in higher peak input voltages in the voltage-doubling circuit. This places higher demands on the voltage-withstanding characteristics of the capacitors and diodes in the circuit. However, the price of high-voltage capacitors and diodes increases exponentially with their voltage-withstanding characteristics, and the limited selection of components significantly limits the output voltage. Summary of the Invention

[0003] In view of this, the present invention aims at the deficiencies of the prior art and proposes a micro-focus ray source with high pressure resistance and high stability.

[0004] The purpose of the utility model can be achieved through the following technical solutions: a micro-focus ray source, characterized in that it includes a first input end, a second input end and at least two voltage doubling modules, each voltage doubling module is connected in series in sequence, the input end of the first voltage doubling module is connected to the transformer through the first input end and the second input end, the output end of the last voltage doubling module outputs a voltage signal, and the polarity of the odd-numbered voltage doubling modules and the even-numbered voltage doubling modules are set oppositely.

[0005] Preferably, the voltage doubling module includes a capacitor array formed by connecting a plurality of capacitors in series and parallel, and a diode string formed by connecting a plurality of diodes in series and parallel, and the output end of the capacitor array is connected to the negative electrode of the diode string.

[0006] Preferably, in the odd-numbered voltage doubling module: the input end of the capacitor array is connected to the first input end, the output end of the capacitor array is connected to the negative pole of the diode string, and the positive pole of the diode string is connected to the second input end; in the even-numbered voltage doubling module: the input end of the capacitor array is connected to the second input end, and the positive pole of the diode string is connected to the first input end.

[0007] Preferably, the capacitor array includes three parallel capacitor strings, each capacitor string including three capacitors connected in series, and the diode string including three diodes connected in series. The capacitors are connected in series and parallel to maintain the overall capacitance, while the withstand voltage is calculated by multiplying the withstand voltage of each capacitor by the number of diodes connected in series. The diodes are connected in series to increase the overall withstand voltage. The number of capacitors and diodes connected in series is generally consistent and can be changed as needed.

[0008] Preferably, the capacitor is a high-voltage capacitor, and the minimum withstand voltage of each capacitor is Uin_pk / 3, and 1.5 times the input is taken as the single withstand voltage selection standard.

[0009] Preferably, the microfocus radiation source includes two voltage doubling modules connected in series, and the two voltage doubling modules are arranged on a circuit board to form a double voltage structure. A plurality of double voltage structures can be cascaded vertically or horizontally.

[0010] Compared to existing technologies, this new design offers the following advantages: It is applicable to both single-ended and double-ended high-voltage power supplies. It can effectively increase the withstand voltage of each stage of the high-voltage multiplier board. By selecting components with appropriate withstand voltages, it significantly improves overall voltage tolerance, enabling higher output voltages, reducing costs and increasing efficiency, extending component life, and enhancing circuit stability and reliability. It can also be used in the design of various industrial X-ray sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 4 is a principle block diagram of a micro-focus ray source in an embodiment.

[0012] Figure 2 2 is a circuit schematic diagram of the voltage doubling module in the embodiment.

[0013] Figure 3 4 is a circuit diagram of a micro-focus ray source in an embodiment. DETAILED DESCRIPTION

[0014] 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.

[0015] As shown in the figure, a micro-focus ray source provided by the present invention includes a first input end, a second input end and at least two voltage doubling modules. The voltage doubling modules are connected in series in sequence. The input end of the first voltage doubling module is connected to the transformer through the first input end and the second input end. The output end of the last voltage doubling module outputs a voltage signal, and the polarity of the odd-numbered voltage doubling modules and the even-numbered voltage doubling modules are set oppositely.

[0016] Combine Figure 2 Specifically, the voltage doubling module includes a capacitor array composed of several capacitors connected in series and parallel, and a diode string composed of several diodes connected in series and parallel. The output end of the capacitor array is connected to the negative electrode of the diode string. The capacitor array includes three groups of parallel capacitor strings, each capacitor string includes three capacitors connected in series, and the diode string includes three diodes connected in series. The capacitors are connected in series and parallel so that the overall capacitance remains unchanged. At this time, the withstand voltage value is the withstand voltage value of each capacitor multiplied by the number of series connections. The diodes are connected in series to increase the overall withstand voltage value. The number of capacitors and diodes connected in series is usually consistent and can be changed as needed.

[0017] The capacitors are high voltage capacitors, and the minimum withstand voltage of each capacitor is Uin_pk / 3. 1.5 times the input is taken as the single withstand voltage selection standard.

[0018] like Figure 3 As shown, in the odd-numbered voltage doubling module: the input end of the capacitor array is connected to the first input end, the output end of the capacitor array is connected to the cathode of the diode string, and the anode of the diode string is connected to the second input end; in the even-numbered voltage doubling module: the input end of the capacitor array is connected to the second input end, and the anode of the diode string is connected to the first input end.

[0019] In the figure, capacitor array C1-C9 is directly connected to the secondary of the transformer as the first-level capacitor array, capacitor array C10-C18 is used as the second-level capacitor array, capacitor array C19-C27 is used as the third-level capacitor array, and capacitor array C28-C36 is used as the fourth-level capacitor array.

[0020] Its working principle is as follows: During the first half-cycle of the power supply voltage, the transformer input voltage is negative at the top and positive at the bottom. At this time, diodes U1-U3 conduct, charging capacitor arrays C1-C9 until their voltage equals the power supply voltage. Then, during the second half-cycle of the power supply voltage, the voltage becomes positive at the top and negative at the bottom, and diodes U4-U6 conduct. At this time, the power supply voltage and capacitor arrays C1-C9 charge capacitor arrays C10-C18 through U4-U6 until the voltage on them equals the power supply voltage plus the voltage of capacitor arrays C1-C9, which is equal to twice the transformer output peak voltage. This process is repeated to fully charge each capacitor. The voltage of each subsequent capacitor array is twice the transformer peak voltage. The voltage borne by each diode string is twice the transformer peak voltage, and the voltage borne by each diode is the group voltage borne divided by the number of diodes in series.

[0021] Furthermore, the present invention can also be used to form a double voltage structure by combining two voltage-doubling modules, which can be arranged on a circuit board. The circuit boards can be cascaded vertically or horizontally according to the required number of stages. The number of diodes and capacitors in each voltage-doubling module can be adjusted as needed.

[0022] By connecting capacitors and diodes in series and parallel, the withstand voltage of each voltage multiplier can be effectively increased, reducing the voltage tolerance of each component and extending its service life. This further enhances the stability and reliability of the circuit. This device can achieve a quadruple voltage boost function and provides two input and output ports. It can be used individually or multiple devices can be spliced ​​together to achieve even higher voltage multiplication.

[0023] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those 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 micro-focus ray source, characterized in that: It includes a first input end, a second input end and at least two voltage doubling modules. The voltage doubling modules are connected in series in sequence. The input end of the first voltage doubling module is connected to the transformer through the first input end and the second input end. The output end of the last voltage doubling module outputs a voltage signal. The polarity of the odd-numbered voltage doubling modules and the even-numbered voltage doubling modules are set oppositely.

2. A microfocus ray source according to claim 1, characterized in that: The voltage doubling module includes a capacitor array formed by connecting a plurality of capacitors in series and parallel, and a diode string formed by connecting a plurality of diodes in series and parallel. The output end of the capacitor array is connected to the negative electrode of the diode string.

3. A microfocus ray source according to claim 2, characterized in that: In the odd-numbered voltage doubling module: the input end of the capacitor array is connected to the first input end, the output end of the capacitor array is connected to the cathode of the diode string, and the anode of the diode string is connected to the second input end; in the even-numbered voltage doubling module: the input end of the capacitor array is connected to the second input end, and the anode of the diode string is connected to the first input end.

4. A microfocus ray source according to claim 2 or 3, characterized in that: The capacitor array includes three groups of parallel capacitor strings, each capacitor string includes three capacitors connected in series, and the diode string includes three diodes connected in series.

5. The microfocus ray source according to claim 3, characterized in that: The capacitors are high-voltage capacitors, and the minimum withstand voltage of each capacitor is Uin_pk / 3, with 1.5 times the input being used as the single withstand voltage selection standard.

6. The microfocus ray source according to claim 3, characterized in that: It includes two voltage doubling modules connected in series, and the two voltage doubling modules are arranged on a circuit board to form a double voltage structure.

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