A discharge cut-off type anode pulse device

Abstract

The present application relates to a kind of discharge cut-off type anode pulse device, including the charging signal driving unit for receiving charging instruction signal and the discharge signal driving unit for receiving discharge instruction signal;Charging signal driving unit is connected with charging gate, and charging gate is connected with charging transformer, and charging transformer is connected with rectification charging holding unit, and rectification charging holding unit is connected with anode pulse power output unit;Discharge signal driving unit is connected with discharge gate, and discharge gate is connected with charging transformer, and rectification charging holding unit is connected with discharge gate;It also includes charging input power unit, and the charging input power unit is connected with charging transformer;Charging transformer generates high-voltage pulse, and high-voltage pulse passes through rectification charging holding unit and forms direct-current high-voltage power supply, and direct-current high-voltage is rapidly reduced to zero under the action of discharge gate, and the characteristics of anode pulse power supply are realized.

Description

Technical Field

[0001] This application relates to the field of anode pulse technology, specifically to a discharge-cut-off anode pulse device. Background Technology

[0002] There are various types of neutron generators, among which miniature neutron generators used for detection and measurement are relatively common. The intensity of neutrons emitted by miniature neutron generators generally does not exceed 10¹⁰ N / s. Miniature neutron generators are typically cylindrical in shape, with a minimum diameter of only 30 mm and a length generally exceeding 1 m. If a miniature neutron generator is in other shapes, its effective volume is similar to that of a cylindrical structure.

[0003] The core component of a miniature neutron generator is the neutron tube. Controlled deuterium-tritium (or deuterium) nuclear fusion occurs within the neutron tube to produce neutrons. The neutron tube ion source is the functional component inside the neutron tube that produces deuterium ions (or tritium ions). Ion sources are also divided into many types, such as hot cathode ion sources and Penning ion sources. The neutron tube that has been commercially available in China is the Penning ion source neutron tube.

[0004] A necessary condition for the operation of the Penning ion source is the application of a 1.8 kV (±1.2 kV) high-voltage power supply to the anode of the ion source. Only when this high-voltage power supply is present can the ion source produce deuterium ions (or tritium ions). The production of deuterium ions (or tritium ions) by the ion source is also a necessary condition for the neutron tube to produce neutrons.

[0005] In applications, if a high-voltage power supply of a certain amplitude is continuously applied to the ion source anode, and other necessary conditions for the neutron tube to operate are met, the neutron tube will macroscopically produce neutrons continuously. If a high-voltage power supply of a certain amplitude is intermittently applied to the ion source anode, and other necessary conditions for the neutron tube to operate are met, the neutron tube will macroscopically produce neutrons intermittently. In most practical applications, it is required that the neutron tube be in a macroscopically intermittent neutron production state, so the ion source anode should be intermittently applied with a high-voltage power supply of a certain amplitude. The component that can intermittently generate a high-voltage power supply of a certain amplitude is called an anode pulse circuit.

[0006] The parameters of the anode pulse circuit include pulse amplitude, pulse frequency, duty cycle (the ratio of pulse width to pulse period), pulse rise time, and pulse fall time. The pulse amplitude range is 0.6kV to 3kV, with 1.8kV being the most common. The pulse frequency range is 0.1Hz to 30kHz. The duty cycle range is 20% to 90%. The pulse rise time is less than 1μs. The pulse fall time is less than 1μs.

[0007] The problem is that within a limited volume, achieving a pulse fall time of less than 1 μs with an anode pulse amplitude of 1.8 kV presents significant challenges. Therefore, an anode pulse circuit was designed to achieve this "pulse fall time less than 1 μs" requirement while also meeting other technical requirements. The anode pulse circuit includes a main body with a control synchronization signal input unit and an anode pulse output unit. The circuit between the control synchronization signal input unit and the anode pulse output unit includes a high-voltage power supply, a ground wire, a synchronization control signal processing unit, a high-level isolator, a low-level isolator, a high-level switch, and a low-level switch. The high-level switch includes a high-level input open terminal, a high-level input closed terminal, a high-level high-side terminal, and a high-level low-side terminal. The high-level high-side terminal is connected to the high-voltage power supply, and the high-level low-side terminal is connected to the anode pulse output unit. The low-level switch includes a low-level input open terminal, a low-level input closed terminal, a low-level high-side terminal, and a low-level low-side terminal. The low-level high-side terminal is connected to the anode pulse output unit, and the low-level low-side terminal is connected to the ground wire. The high-level isolator includes a high-level in-phase input terminal, a high-level inverting input terminal, and a high-level in-phase input terminal. The low-level isolator includes a low-level non-inverting input, a low-level inverting input, a low-level non-inverting output, and a low-level inverting output. The synchronization control signal processing unit generates a ground connection end signal, a high-voltage power supply start signal, a high-voltage power supply end signal, and a ground connection start signal. The ground connection end signal is connected to the low-level inverting input, the high-voltage power supply start signal is connected to the high-level non-inverting input, the high-voltage power supply end signal is connected to the high-level inverting output, the ground connection start signal is connected to the low-level non-inverting input, the high-level non-inverting output is connected to the high-level input open, the high-level inverting output is connected to the high-level input closed, the low-level non-inverting output is connected to the low-level input open, and the low-level inverting output is connected to the low-level input closed. When the synchronization control signal rises, it sequentially generates a ground connection termination signal and a high-voltage power supply connection start signal, disconnecting the anode pulse output unit from the ground and connecting it to the high-voltage power supply, thus making the anode pulse output amplitude the same as the high-voltage power supply amplitude. When the synchronization control signal falls, it sequentially generates a high-voltage power supply connection termination signal and a ground connection start signal, disconnecting the anode pulse output unit from the high-voltage power supply and connecting it to the ground, thus making the anode pulse output amplitude the same as the ground amplitude. Because the response time of the high-level switch and the low-level switch is set to within 1μs, the pulse rise time and pulse fall time of this circuit are both less than 1μs. The anode pulse amplitude of this circuit is determined by the high-voltage power supply amplitude, while the frequency and duty cycle are determined by the synchronization control signal.

[0008] However, this technical solution still has shortcomings. When applied to neutron generators, it can occasionally be damaged due to internal discharges within the neutron tube. Providing an anode pulse is only a necessary condition for the neutron tube to operate. For the neutron tube to produce neutrons, an accelerating electric field of -80kV to -100kV must also be applied to the accelerating cavity of the neutron tube. Deuterium ions (or tritium ions) generated during the ionization of the Penning particle source are extracted and then directed towards the target surface under the influence of the accelerating electric field to produce neutrons. Due to the influence of factors such as the ion source current fluctuations, the gas pressure inside the neutron tube, the roughness of the tube wall, and the geometric uniformity, the current of the accelerating power supply providing the accelerating electric field will exhibit fluctuations, and occasionally, severe fluctuations will occur. When severe fluctuations exceed a certain amplitude, it is called internal discharge of the neutron tube, or internal arcing (or arcing) within the neutron tube. Because both the high-level and low-level switches in this scheme are constructed using MOSFETs, although the main MOSFET has a high withstand voltage, the auxiliary MOSFET, which performs the open-loop function, does not have a sufficiently high withstand voltage. If the withstand voltage is too high, it will lose its auxiliary function. Therefore, neutron tube discharge can damage the auxiliary MOSFET, and even subsequently damage the main MOSFET. Furthermore, in this technical scheme, the high-voltage power supply is always present. The ever-present high-voltage power supply exacerbates the phenomenon of "occasional MOSFET damage caused by neutron tube discharge" and can also damage the high-voltage power supply itself. If the high-voltage power supply fails, it is difficult to repair it immediately on-site; the entire high-voltage power supply assembly must be replaced. If neutron tube discharge causes MOSFET damage, finding the damaged MOSFET is a very tedious task. Among numerous MOSFETs, only individual testing can locate the damaged one, and the number of damaged MOSFETs varies each time the damage occurs. Moreover, when neutron tube discharge causes MOSFET damage, the damaged MOSFET cannot be identified through online detection. Therefore, when damage occurs, all related MOSFETs in the circuit must be replaced.

[0009] Occasional internal discharges in the Penning ion source neutron tube are an unavoidable problem during operation, and existing technologies cannot solve the problem of anode pulse circuit damage. Therefore, it is of great significance to research a discharge-cutoff anode pulse circuit technology that can adapt to occasional discharges in the Penning ion source neutron tube during operation. Summary of the Invention

[0010] In order to overcome the shortcomings of the prior art, the main objective of this invention is to provide a discharge-stop anode pulse circuit that can adapt to occasional discharges of the Penning ion source neutron tube during operation. The anode pulse circuit is designed to prevent damage to the anode pulse circuit due to internal discharges of the Penning ion source neutron tube.

[0011] To achieve the above objectives, the present invention adopts the following technical solution: a discharge cut-off anode pulse device, comprising a charging signal driving unit for receiving charging command signals and a discharge signal driving unit for receiving discharge command signals. The charging signal driving unit is connected to the charging gate, the charging gate is connected to the charging transformer, the charging transformer is connected to the rectifier charging and holding unit, and the rectifier charging and holding unit is connected to the anode pulse power output unit. The discharge signal driving unit is connected to the discharge gate, the discharge gate is connected to the charging transformer, and the rectifier charging holding unit is connected to the discharge gate; It also includes a charging input power unit, which is connected to the charging transformer; When the charging signal driving unit receives the charging command signal, it amplifies the received charging command signal and sends the amplified charging command signal to the charging gate. The charging gate opens, and after the charging transformer receives the signal that the charging gate is open, the charging transformer generates a high voltage pulse and sends the generated high voltage pulse to the rectifier charging and holding unit. The rectifier charging and holding unit outputs a high voltage to the anode pulse power output unit, and the anode pulse power output unit outputs a high voltage. When the discharge signal driving unit receives the discharge command signal, it amplifies the received discharge command signal and sends the amplified discharge command signal to the discharge gate. The discharge gate opens, and after the rectifier charge holding unit receives the signal that the discharge gate is open, it discharges all the remaining charge stored in a very short time. The voltage output by the rectifier charge holding unit to the anode pulse power supply output unit is reduced to the ground voltage level, and the anode pulse power supply output unit outputs an anode pulse synchronized with the discharge command signal.

[0012] Preferably, it further includes a synchronization control signal processing unit. When the synchronization control signal processing unit receives the command signal, it generates a charging signal when the command signal is at its rising edge and sends the generated charging signal to the charging signal driving unit, which amplifies the charging signal. When the command signal is at its falling edge, it generates a discharging signal and sends the discharging signal to the discharging signal driving unit, which amplifies the discharging signal.

[0013] Preferably, the system further includes a synchronization signal input unit and a synchronization control signal processing unit. The synchronization signal input unit receives a command signal, distinguishes between the rising and falling edges of the command signal, and sends the result to the synchronization control signal processing unit. Upon receiving the result, the synchronization control signal processing unit generates a charging signal when the command signal is determined to be a rising edge, and sends the generated charging signal to a charging signal driving unit for amplification. When the command signal is determined to be a falling edge, a discharging signal is generated and sent to a discharging signal driving unit for amplification.

[0014] Preferably, it further includes an anode pulse amplitude control unit and an anode pulse amplitude measurement unit. The anode pulse amplitude measurement unit is connected to the anode pulse power output unit and is used to detect the anode pulse amplitude output by the anode pulse power output unit and send the detected anode pulse amplitude to the anode pulse amplitude control unit. The anode pulse amplitude control unit is connected between the charging input power unit and the charging transformer. The anode pulse amplitude control unit controls the anode pulse amplitude output by the charging input power unit to the charging transformer according to the received anode pulse amplitude.

[0015] Preferably, it also includes an anode pulse current sampling unit, and the discharge gate is connected to the ground wire through the anode pulse current sampling unit.

[0016] Preferably, the rectified charge holding unit will completely discharge the remaining charge within 1μs.

[0017] Preferably, when the anode pulse amplitude received by the anode pulse amplitude control unit is greater than the set anode pulse amplitude value, the anode pulse amplitude control unit controls the charging input power supply unit to reduce the anode pulse amplitude output to the charging transformer; when the anode pulse amplitude received by the anode pulse amplitude control unit is less than the set anode pulse amplitude value, the anode pulse amplitude control unit controls the charging input power supply unit to increase the anode pulse amplitude output to the charging transformer.

[0018] Compared with the prior art, the present invention has the following advantages: (1) The present invention generates high voltage pulses through a charging transformer. The high voltage pulses are rectified and charged to form a DC high voltage power supply through a rectifier charging and holding unit. The DC high voltage is rapidly reduced to zero under the action of the discharge gate, realizing the characteristics that the anode pulse power supply should have. Because the charging transformer and the rectifier charging and holding unit have extremely strong resistance to high voltage impact, the circuit will not be damaged when there is occasional discharge inside the neutron tube. The discharge gate is composed of field effect transistors with sufficient high voltage resistance, and there is no need for auxiliary field effect transistors with low voltage resistance. Therefore, the discharge gate will not be damaged when there is occasional discharge inside the neutron tube.

[0019] (2) The charging transformer of the present invention serves to generate high voltage. High voltage is only generated when the command signal is at a high level, and there is no high voltage output when the command signal is at a low level. Therefore, the present invention does not have a perpetually existing high voltage power supply, reducing a factor that aggravates the internal discharge of the neutron tube. Attached Figure Description

[0020] Figure 1 This is a structural block diagram of the discharge cutoff anode pulse device in an embodiment of the present invention; Figure 2 This is a structural block diagram of a discharge-cut-off anode pulse device according to one embodiment of the present invention; Figure 3 This is a structural block diagram of a discharge-cut-off anode pulse device according to another embodiment of the present invention; Figure 4 This is a structural block diagram of a discharge-cut-off anode pulse device according to another embodiment of the present invention; Figure 5 This is a structural block diagram of a discharge-cut-off anode pulse device according to another embodiment of the present invention; Figure 6 This is a waveform diagram of the anode pulse in an embodiment of the present invention. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments. Example 1

[0022] like Figure 1 As shown, this embodiment provides a discharge cutoff anode pulse device, including a charging signal driving unit 3 for receiving charging command signals and a discharge signal driving unit 4 for receiving discharge command signals. The output terminal of the charging signal driving unit 3 is connected to the input terminal of the charging gate 5, the output terminal of the charging gate 5 is connected to the primary inverting terminal of the charging transformer 6, the secondary non-inverting terminal of the charging transformer 6 is connected to the positive terminal of the rectifier charging and holding unit 7, and the positive terminal of the rectifier charging and holding unit 7 is connected to the anode pulse power output unit 9. The output terminal of the discharge signal driving unit 4 is connected to the input terminal of the discharge gate 8, the negative terminal of the discharge gate 8 is connected to the inverting terminal of the secondary winding of the charging transformer 6, and the negative terminal of the rectifier charging holding unit 7 is connected to the negative terminal of the discharge gate 8; the negative terminal of the discharge gate 8 is also connected to the ground wire through the anode pulse current sampling unit 11. It also includes a charging input power supply unit 13, the output terminal of which is connected to the in-phase input terminal of the charging transformer 6; In this embodiment, the charging command signal received by the charging signal driving unit 3 (for receiving charging command signals) and the discharging command signal received by the discharging command signal driving unit 4 are both directly transmitted through external circuits. Specifically, the charging command signal from the external circuit is sent to the charging signal driving unit 3, which amplifies the power. The amplified charging signal then enters the charging gate 5, opening the gate and generating a high-voltage pulse at the secondary output of the charging transformer 6. This high-voltage pulse is then sent from the secondary side of the charging transformer 6 to the rectifier charging hold unit 7, which outputs a DC high voltage. This high voltage is then sent to the anode pulse power output unit 9, causing it to output a high voltage. At the falling edge of the synchronization control signal, the discharging command signal from the external circuit is sent to the discharging signal driving unit 4, which amplifies the power. After the amplified discharge signal enters the discharge gate 8, the gate opens, causing the remaining charge stored in the rectifier-charge-hold unit 7 to discharge completely within 1μs. This causes the voltage supplied by the rectifier-charge-hold unit 7 to the anode pulse power supply output unit 9 to immediately drop to the ground voltage level. Therefore, the anode pulse power supply output unit 9 outputs an anode pulse synchronized with the command signal. The amplitude of the anode pulse is determined by the charging input power supply 13, and the output amplitude value of the charging input power supply 13 determines the anode pulse amplitude. The anode pulse current sampling unit 11 can convert the load current of the anode pulse into a voltage quantity. Example 2

[0023] Based on Example 1, such as Figure 2 As shown, it also includes a synchronization control signal processing unit 2, the output of which is connected to the charging signal driving unit 3 and the discharging signal driving unit 4 respectively; as shown Figure 2 The synchronous control signal processing unit 2 shown receives a standard synchronous control signal from the external circuit input command pulse, which does not require processing. The received command pulse signal includes a rising edge pulse signal and a falling edge pulse signal. After receiving the command signal (command pulse signal) input from the external circuit, the synchronous control signal processing unit 2 generates a charging signal when the command signal is at its rising edge and sends the generated charging signal to the charging signal driving unit 3, which amplifies the charging signal. When the command signal is at its falling edge, it generates a discharging signal and sends the discharging signal to the discharging signal driving unit 4, which amplifies the discharging signal. Specifically, when the command signal received by the control signal processing unit 2 is at its rising edge, a charging signal is generated and sent to the charging signal driving unit 3. The charging signal driving unit amplifies the power, and the amplified charging signal enters the charging gate 5, thus opening the charging gate 5 and causing a high-voltage pulse to be generated at the secondary output terminal of the charging transformer 6. The high-voltage pulse is sent from the secondary side of the charging transformer 6 to the rectifier charging and holding unit 7, which outputs a DC high voltage. This high voltage is then sent to the anode pulse power supply output unit 9, causing the anode pulse power supply output unit 9 to output a high voltage.

[0024] When the command signal received by the control signal processing unit 2 is at its falling edge, a discharge signal is generated and sent to the discharge signal driving unit 4 for power amplification. The amplified discharge signal enters the discharge gate 8, opening it and causing all remaining charge stored in the rectifier-charge-holding unit 7 to discharge within 1μs. This causes the voltage supplied by the rectifier-charge-holding unit 7 to the anode pulse power supply output unit 9 to immediately drop to ground level. Therefore, the anode pulse power supply output unit 9 outputs an anode pulse synchronized with the command signal. The amplitude of the anode pulse is determined by the charging input power supply 13; the output amplitude of the charging input power supply 13 determines the anode pulse amplitude. The anode pulse current sampling unit 11 can convert the load current of the anode pulse into a voltage value. Example 3

[0025] Based on Example 1, such as Figure 3As shown, it also includes a synchronization signal input unit 1 and a synchronization control signal processing unit 2. The input terminal of the synchronization signal input unit 1 is connected to the output terminal of the synchronization control signal processing unit 2. The synchronization signal input unit 1 receives the command signal and performs edge discrimination and amplitude standardization on the command signal. The processed synchronization control signal conforming to the standard of this circuit is sent to the synchronization control signal processing unit 2. After receiving the discrimination result, the synchronization control signal processing unit 2 generates a charging signal when the discrimination command signal is at the rising edge. The synchronization control signal processing unit 2 sends the generated charging signal to the charging signal driving unit 3, which amplifies the charging signal. When the discrimination command signal is at the falling edge, a discharging signal is generated and sent to the discharging signal driving unit 4, which amplifies the discharging signal. Specifically, after receiving the signal determined by the synchronization signal input unit 1, the synchronization control signal processing unit 2 generates a charging signal at the rising edge of the signal and a discharging signal at the falling edge of the synchronization control signal. At the rising edge of the synchronization control signal, the charging signal is sent to the charging signal driving unit 3, which amplifies the power. The amplified charging signal enters the charging gate 5, opening it and causing a high-voltage pulse to be generated at the secondary output of the charging transformer 6. This high-voltage pulse is sent from the secondary side of the charging transformer 6 to the rectifier charging and holding unit 7, which outputs a high DC voltage. This high voltage is then sent to the anode pulse power output unit 9, causing it to output a high voltage. At the falling edge of the synchronization control signal, the discharging signal is sent to the discharging signal driving unit 4, which amplifies the power. After the amplified discharge signal enters the discharge gate 8, the discharge gate 8 is opened, causing all the remaining charge stored in the rectifier-charge-hold unit 7 to discharge within 1μs. This causes the voltage supplied by the rectifier-charge-hold unit 7 to the anode pulse power supply output unit 9 to immediately drop to the ground voltage level. Therefore, the anode pulse power supply output unit 9 outputs an anode pulse synchronized with the command signal. The amplitude of the anode pulse is determined by the charging input power supply 13. The output amplitude value of the charging input power supply 13 determines the anode pulse amplitude. The anode pulse current sampling unit 11 can convert the load current of the anode pulse into a voltage quantity. In this embodiment, as long as the amplitude of the anode pulse is adjusted to meet the operating requirements of the neutron tube, it is not necessary to adjust the amplitude of the anode pulse. Example 4

[0026] Based on Example 2, such as Figure 4The device also includes an anode pulse amplitude control unit 12 and an anode pulse amplitude measurement unit 10. The anode pulse amplitude measurement unit 10 is connected to the anode pulse power output unit 9 and is used to detect the anode pulse amplitude output by the anode pulse power output unit 9 and send the detected anode pulse amplitude to the anode pulse amplitude control unit 12. The anode pulse amplitude control unit 12 is connected between the charging input power unit 13 and the charging transformer 6. The anode pulse amplitude control unit 12 controls the anode pulse amplitude output by the charging input power unit 13 to the charging transformer 6 according to the received anode pulse amplitude. The synchronous control signal processing unit 2 receives a pulse signal that generates a charging signal at the rising edge and a discharging signal at the falling edge of the command signal. When the synchronous control signal is at its rising edge, the charging signal is sent to the charging signal driving unit 3, which amplifies the power. The amplified charging signal enters the charging gate 5, opening it and causing a high-voltage pulse to be generated at the secondary output of the charging transformer 6. This high-voltage pulse is then sent from the secondary side of the charging transformer 6 to the rectifier charging and holding unit 7, which outputs a high-voltage DC signal. This high voltage is then sent to the anode pulse power output unit 9, causing it to output a high voltage. At the falling edge of the synchronous control signal, the discharging signal is sent to the discharging signal driving unit 4, which amplifies the power. After the amplified discharge signal enters the discharge gate 8, the gate opens, causing the remaining charge stored in the rectifier-charge-holding unit 7 to discharge completely within 1μs. This causes the voltage supplied by the rectifier-charge-holding unit 7 to the anode pulse power output unit 9 to immediately drop to the ground voltage level. Therefore, the anode pulse power output unit 9 outputs an anode pulse synchronized with the command signal. The amplitude of the anode pulse is determined by the anode pulse amplitude control unit 12. The anode pulse amplitude measurement unit 10 samples the amplitude of the anode pulse output by the anode pulse power output unit 9, and feeds the sampling result back to the anode pulse amplitude control unit 12. The anode pulse amplitude control unit 12 compares the sampling result with the set value. If the sampling result is higher than the set value, the voltage amplitude supplied by the charging input power supply unit 13 to the charging transformer 6 is reduced; conversely, the voltage amplitude supplied by the charging input power supply unit 13 to the charging transformer 6 is increased. In this way, the anode pulse amplitude output by the anode pulse power output unit 9 maintains a state that corresponds one-to-one with the set value. The anode pulse current sampling unit 11 can convert the load current of the anode pulse into a voltage quantity. Example 5

[0027] Based on Example 3, such as Figure 5As shown, the command signal is processed by the synchronization control signal input unit 1, which performs edge detection and amplitude specification. The processed synchronization control signal, conforming to the circuit standard, is then sent to the synchronization control signal processing unit 2. The synchronization control signal processing unit 2 generates a charging signal at the rising edge of the synchronization control signal and a discharging signal at the falling edge. At the rising edge of the synchronization control signal, the charging signal is sent to the charging signal driving unit 3, which amplifies the power. The amplified charging signal enters the charging gate 5, opening it and generating a high-voltage pulse at the secondary output of the charging transformer 6. This high-voltage pulse is sent from the secondary side of the charging transformer 6 to the rectifier charging and holding unit 7, which outputs a high DC voltage. This high voltage is then sent to the anode pulse power output unit 9, causing it to output a high voltage. At the falling edge of the synchronization control signal, the discharging signal is sent to the discharging signal driving unit 4, which amplifies the power. After the amplified discharge signal enters the discharge gate 8, the discharge gate 8 is opened, causing all the remaining charge stored in the rectifier charge holding unit 7 to discharge within 1μs. This causes the voltage supplied by the rectifier charge holding unit 7 to the anode pulse power output unit 9 to immediately drop to the ground voltage level. Therefore, the anode pulse power output unit 9 outputs an anode pulse synchronized with the command signal. The amplitude of the anode pulse is determined by the anode pulse amplitude control unit 12. The anode pulse amplitude measurement unit 10 samples the amplitude of the anode pulse output by the anode pulse power output unit 9, and the sampling result is fed back to the anode pulse amplitude control unit 12. The anode pulse amplitude control unit 12 compares the sampling result with the set value. If the sampling result is higher than the set value, the voltage amplitude supplied by the charging input power supply unit 13 to the charging transformer 6 is reduced; conversely, the voltage amplitude supplied by the charging input power supply unit 13 to the charging transformer 6 is increased. In this way, the anode pulse amplitude output by the anode pulse power output unit 9 maintains a state that corresponds one-to-one with the set value. The anode pulse current sampling unit 11 can convert the load current of the anode pulse into a voltage quantity.

[0028] In this embodiment, the discharge-cutoff anode pulse circuit operates with an adjustable anode pulse amplitude. The anode pulse frequency and duty cycle are identical to the command signal, and the timing is synchronized with the command signal. The anode pulse fall time is less than 1μs. Assuming the command signal frequency is 10kHz and the duty cycle is 40%, the anode pulse amplitude control unit 12 sets the anode pulse amplitude to 2.4kV. The anode pulse waveform output by the anode pulse power supply output unit 9 is shown below. Figure 6 .

[0029] The discharge-cut-off anode pulse circuit of this embodiment provides an anode pulse to the neutron tube. During use, the command signal frequency is 10kHz, the duty cycle is 40%, and the anode pulse amplitude control unit 12 is set to 1.8kV. The discharge-cut-off anode pulse circuit has operated fault-free for over 1000 hours, during which time several neutron tubes have been replaced.

[0030] The above embodiments are merely illustrative examples of the present invention and do not constitute a limitation on the scope of protection of the present invention. Any designs that are the same as or similar to the present invention are within the scope of protection of the present invention.

Claims

1. A discharge-cut-off type anode pulse device, characterized in that, It includes a charging signal driving unit (3) for receiving charging command signals and a discharging signal driving unit (4) for receiving discharging command signals. The charging signal driving unit (3) is connected to the charging gate (5), the charging gate (5) is connected to the charging transformer (6), the charging transformer (6) is connected to the rectifier charging holding unit (7), and the rectifier charging holding unit (7) is connected to the anode pulse power output unit (9). The discharge signal driving unit (4) is connected to the discharge gate (8), the discharge gate (8) is connected to the charging transformer (6), and the rectifier charging holding unit (7) is connected to the discharge gate (8). It also includes a charging input power supply unit (13), which is connected to the charging transformer (6); When the charging signal driving unit (3) receives the charging command signal, the charging signal driving unit (3) amplifies the received charging command signal and sends the amplified charging command signal to the charging gate (5). The charging gate (5) opens. After the charging transformer (6) receives the signal that the charging gate (5) is open, the charging transformer (6) generates a high voltage pulse and sends the generated high voltage pulse to the rectifier charging holding unit (7). The rectifier charging holding unit (7) outputs a high voltage to the anode pulse power output unit (9). The anode pulse power output unit (9) outputs a high voltage. When the discharge signal driving unit (4) receives the discharge command signal, the discharge signal driving unit (4) amplifies the received discharge command signal and sends the amplified discharge command signal to the discharge gate (8). The discharge gate (8) opens. After the rectifier charge holding unit (7) receives the signal that the discharge gate (8) is open, the rectifier charge holding unit (7) discharges all the remaining charge stored in a very short time. The voltage output by the rectifier charge holding unit (7) to the anode pulse power output unit (9) is reduced to the ground voltage level. The anode pulse power output unit (9) outputs an anode pulse synchronized with the discharge command signal.

2. The discharge-cut-off anode pulse device according to claim 1, characterized in that, It also includes a synchronous control signal processing unit (2). When the synchronous control signal processing unit (2) receives the command signal, it generates a charging signal when the command signal is at the rising edge. The synchronous control signal processing unit (2) sends the generated charging signal to the charging signal driving unit (3), which amplifies the charging signal. When the command signal is at the falling edge, it generates a discharging signal and sends the discharging signal to the discharging signal driving unit (4), which amplifies the discharging signal.

3. The discharge-cut-off anode pulse device according to claim 1, characterized in that, It also includes a synchronization signal input unit (1) and a synchronization control signal processing unit (2). The synchronization signal input unit (1) is used to receive the command signal, and to distinguish the rising and falling edges of the command signal, and to send the result of the judgment to the synchronization control signal processing unit (2). After receiving the result of the judgment, the synchronization control signal processing unit (2) generates a charging signal when the command signal is at the rising edge. The synchronization control signal processing unit (2) sends the generated charging signal to the charging signal driving unit (3), and the charging signal driving unit (3) amplifies the charging signal. When the command signal is at the falling edge, a discharging signal is generated and the discharging signal is sent to the discharging signal driving unit (4), and the discharging signal driving unit (4) amplifies the discharging signal.

4. A discharge-cut-off anode pulse device according to claim 1, 2, or 3, characterized in that, It also includes an anode pulse amplitude control unit (12) and an anode pulse amplitude measurement unit (10). The anode pulse amplitude measurement unit (10) is connected to the anode pulse power output unit (9) and is used to detect the anode pulse amplitude output by the anode pulse power output unit (9) and send the detected anode pulse amplitude to the anode pulse amplitude control unit (12). The anode pulse amplitude control unit (12) is connected between the charging input power unit (13) and the charging transformer (6). The anode pulse amplitude control unit (12) controls the anode pulse amplitude output by the charging input power unit (13) to the charging transformer (6) according to the received anode pulse amplitude.

5. The discharge-cut-off anode pulse device according to claim 1, characterized in that, It also includes an anode pulse current sampling unit (11), and the discharge gate (8) is connected to the ground wire through the anode pulse current sampling unit (11).

6. The discharge-cut-off anode pulse device according to claim 1, characterized in that, The rectified charge holding unit (7) will discharge all the remaining charge within 1μs.

7. The discharge-cut-off anode pulse device according to claim 4, characterized in that, When the anode pulse amplitude received by the anode pulse amplitude control unit (12) is greater than the set anode pulse amplitude value, the anode pulse amplitude control unit (12) controls the charging input power supply unit (13) to reduce the anode pulse amplitude output to the charging transformer (6). When the anode pulse amplitude received by the anode pulse amplitude control unit (12) is less than the set anode pulse amplitude value, the anode pulse amplitude control unit (12) controls the charging input power supply unit (13) to increase the anode pulse amplitude output to the charging transformer (6).

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