High voltage unit control method and system

Abstract

This invention discloses a high-voltage unit control method and system, relating to the field of anode voltage control technology. In this invention, the PSM module power supply includes a DC unit, a switch, and bypass diodes. A high-voltage unit is formed by connecting forty-five bypass diodes of the PSM module power supply in series. The operating characteristic parameters of the PSM module power supply are acquired through an analog signal acquisition module. Overcurrent and overvoltage signals from the PSM module power supply are monitored by a digital transceiver module. An FPGA module drives the PSM control module to control the PSM module power supply's on / off state based on the operating characteristic parameters and the parameters of the overcurrent or overvoltage signals. This invention improves response speed by reducing the ripple frequency of the PSM power supply.

Description

Technical Field

[0001] This invention belongs to the field of anode voltage control technology, and in particular relates to a high-voltage unit control method. Background Technology

[0002] The high-power, high-voltage unit supplies power to the ion cyclotron resonance heating system of China's fully superconducting tokamak device. The voltage modulation of this power system requires real-time parameter adjustments based on changes in plasma load impedance. The PSM stepped modulation power supply has a voltage of 35kV, a current of around 150A, and an average output power of 1.5MW~2MW. Ripple characteristics are a crucial technical indicator; lower ripple is better while ensuring normal operation.

[0003] The existing PSM high-voltage unit consists of 44 normally open PSM power supplies and 1 PWM module power supply. Its ripple frequency depends on the frequency of the PWM module power supply, which is generally low. This results in significant ripple in the high-voltage unit, negatively impacting the entire system in several ways. Firstly, for the load, the ripple superimposed on the DC output leads to voltage instability, causing malfunctions or performance degradation in equipment reliant on a stable power supply. For example, in an ion cyclotron resonance heating (ICRH) system, it affects transmitter performance and reduces ion cyclotron resonance heating efficiency. Secondly, for the power supply itself, the large ripple causes internal components such as capacitors, inductors, and transistors to experience higher voltage and current stress, increasing power loss. Furthermore, for the control system, the large ripple makes the power supply output unstable, causing signal fluctuations in the control system, leading to decreased control accuracy, inability to precisely adjust the output, and interference with the control system signal. This can cause misjudgments and incorrect adjustment measures, affecting system stability. Summary of the Invention

[0004] The purpose of this invention is to provide a high-voltage unit control method and system.

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a high-voltage unit control method, comprising:

[0007] The PSM module power supply includes a DC unit, a switch, and bypass diodes. Forty-five bypass diodes of the PSM module power supply are connected in series to form a high-voltage unit.

[0008] The operating characteristic parameters of the high-voltage unit are obtained through the analog quantity acquisition module;

[0009] The digital transceiver module acquires overcurrent and overvoltage protection signals from the high-voltage unit;

[0010] The FPGA module adjusts the output voltage and the required output power of the amplifier according to the operating characteristic parameters of the high-voltage unit. When the high-voltage unit experiences overcurrent or overvoltage faults, the high-voltage unit is disconnected at the hardware level, and a signal is sent to the FPGA module to block it at the software level.

[0011] Furthermore, a current sensor is used to detect the current of the high-voltage unit. The current is compared with a preset threshold by an LM393 comparator and an overcurrent or overvoltage signal is output. The digital transceiver module receives the overcurrent or overvoltage signal. If the current exceeds the preset threshold, the FPGA module shuts down and blocks the PSM control signal, cutting off the high-voltage unit.

[0012] Furthermore, the operating characteristics include anode voltage Ua, anode current Ia, screen grid voltage Us, screen grid current Is, gate voltage Ug, gate current Ig, incident power Pin, and reflected power Pref.

[0013] Furthermore, the analog module uses two sets of LTC2325 chips, each with four acquisition channels, for a total of eight channels and a sampling rate of 5Mbps, for real-time acquisition of the operating characteristic parameters of the high-voltage unit.

[0014] Furthermore, the output power of the high-voltage unit is adjusted by a voltage standing wave ratio (VSWR) controller; the VSWR is maintained between 1 and 2 using a voltage standing wave ratio controller.

[0015] When the VSWR is greater than 1 and less than 2, the output power of the high-voltage unit is adjusted to keep the power required by the load constant. When the VSWR is greater than 2 and less than 3, the output power is adjusted to keep the reflected power constant. When the VSWR is greater than 3, the output power is set to 0.

[0016] Furthermore, controlling the anode power loss at P APD Below the limit, the screen current is controlled to not exceed the threshold.

[0017] Calculate the anode power loss P APD And determine whether it exceeds the threshold P. APD If the limit is exceeded, the output preset power Pset2 and anode voltage Ua will be reduced so that the anode power loss is within the threshold P. APD Below _limit;

[0018] Simultaneously, it is determined whether the screen grid current Is exceeds the rated value Is_nom. If it does, it is further determined whether it exceeds the limit value Is_limit. If it exceeds the limit value Is_limit, the output preset power Pset2 is reduced so that the screen grid current Is is kept below the limit value Is_limit. Otherwise, Pset2 is increased to the desired value.

[0019] Whether to increase the anode voltage Ua depends on whether the screen grid current Is exceeds Is_nom+0.5, and ensures that it does not exceed the maximum limit Ua_limit, which is 27kV.

[0020] Furthermore, the PSM control module includes a PSM module driver controller, which has a built-in FPGA algorithm program to control the high and low of the IO pins according to requirements, and execute the PSM control module turn-on and turn-off signals.

[0021] Based on the required anode voltage, the required output duty cycle of each PSM module power supply is calculated, and the phase shift control of the PSM module power supply is performed.

[0022] The anode voltage control system includes a control unit and a high-voltage unit:

[0023] The high-voltage unit is formed by forty-five PSM module power supplies;

[0024] The control unit includes:

[0025] The analog signal acquisition module includes an analog-to-digital conversion control circuit and a signal conditioning circuit, which is used to acquire the anode voltage Ua, anode current Ia, screen grid voltage Us, screen grid current Is, gate voltage Ug, gate current Ig, incident power Pin, and reflected power Pref signals.

[0026] Digital transceiver module, used to receive fault signals such as overcurrent and overvoltage from the high-voltage unit;

[0027] The PSM control module is used to drive the PSM module power supply to turn on and off, thereby regulating the anode voltage.

[0028] The SoC FPGA module is used to process the analog signals acquired by the analog acquisition module, read the power status of the PSM module of the digital transceiver module, control the power on and off of the PSM module, and interact with the transmitter.

[0029] Furthermore, the high-voltage unit also includes a high-voltage resistance-capacitance measurement unit, a current sensor, and a current overcurrent protection module. The high-voltage resistance-capacitance measurement unit is used to detect the voltage of the high-voltage unit, and the current sensor is used to detect the current of the high-voltage unit.

[0030] The current of the high-voltage unit is compared by the overcurrent protection module, and the compared parameter signal is sent to the digital transceiver module. If an abnormality occurs, the abnormal signal is sent to the PSM control module.

[0031] Furthermore, it also includes a transmitter and a soft starter cabinet, the transmitter including a reset module, a switch control module, and a soft starter circuit;

[0032] The reset module requires the transmitter to reset the FPGA when the high-voltage unit needs to be restarted.

[0033] Switch control module; used for the on / off control of the high-voltage unit;

[0034] The soft starter cabinet is used to control the magnitude of the surge current and the slope of the output voltage rise when the switching power supply starts. If overvoltage, overcurrent or other faults occur, the protection mechanism is triggered and the control system is locked.

[0035] The present invention has the following beneficial effects:

[0036] This invention improves response speed, reduces voltage fluctuations, and enhances system dynamic response by lowering the PSM power supply ripple frequency. It features overvoltage and overcurrent protection mechanisms, enabling rapid hardware-level disconnection of the anode power system to ensure power supply and control system safety. The voltage standing wave ratio (VSWR) controller accurately and quickly adjusts the high-voltage unit output power, improving system stability and response speed, making it suitable for high-precision industrial applications. The anode voltage controller adjusts output power and anode voltage based on anode power loss and screen grid current, ensuring normal tetrode operation and optimizing its efficiency. The PSM module drive controller employs a phase-shift control strategy to reduce ripple frequency, lowering requirements for energy storage components and improving power output quality. The analog acquisition module uses two sets of LTC2325 chips with a high sampling frequency, accurately acquiring operating characteristic parameters. The overall system features a modular design with redundancy and maintainability, making it suitable for high-power, high-requirement industrial applications.

[0037] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0039] Figure 1 This is a block diagram of the anode voltage control system;

[0040] Figure 2 Diagram of power supply cascading for the high-voltage unit PSM module;

[0041] Figure 3 A flowchart for Voltage Standing Wave Ratio (VSWR);

[0042] Figure 4 Here is the flowchart for the anode voltage controller;

[0043] Figure 5 This is a schematic diagram of the phase-shift control signal for the PSM module driver controller. Detailed Implementation

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0045] This invention relates to a high-voltage unit control method: its core lies in achieving high-precision, high-reliability, and high-efficiency operation of the high-voltage unit through multi-module collaborative control. This method uses 45 PSM module power supplies connected in series to form the high-voltage unit, and combines them with analog signal acquisition modules, digital signal transceiver modules, and FPGA control modules to form a complete closed-loop control system.

[0046] The phase-shift control strategy of the PSM module significantly reduces the ripple frequency and improves the dynamic response capability of the power supply.

[0047] It integrates intelligent voltage standing wave ratio (VSWR) adjustment function, automatically switching to the optimal control mode under different VSWR conditions to ensure stable system operation.

[0048] Design an anode voltage controller to adjust the output parameters in real time based on anode power loss and screen grid current, thereby optimizing the working efficiency of the tetrode while ensuring its normal operation.

[0049] Equipped with hardware-level overvoltage and overcurrent protection circuitry, it can quickly cut off power in the event of a fault, ensuring system safety. This technology is particularly suitable for high-power, high-precision industrial applications such as the ion cyclotron resonance heating system of China's fully superconducting tokamak device, offering significant advantages such as low ripple, fast response, comprehensive protection, and precise adjustment, providing an effective solution for the optimized design of high-power, high-voltage units.

[0050] Please see Figure 1 and Figure 2 As shown, the anode voltage control method.

[0051] The high-voltage unit consists of 45 identical PSM module power supplies connected in series to form the high-voltage unit output. Each PSM module power supply includes one DC power supply, one switch S, and one bypass diode D. When switch S is open, the power supply unit provides freewheeling current to the main power circuit through the bypass diode, and the shutdown of any power supply unit will not cause the output of the entire power supply to be interrupted.

[0052] In addition, the control unit includes an FPGA control module, a PSM driver module, a digital transceiver module, and an analog acquisition module.

[0053] The FPGA module uses SoC FPGA (System-on-Programmable Gate Array) as its core to process the acquired analog signals, read the power status of the PSM module of the digital transceiver module, drive the PSM module power on and off, and interact with the transmitter via soft-start and global power-on signals.

[0054] The analog module uses two sets of LTC2325 chips, each with four acquisition channels and a sampling frequency of 5Mbps, to acquire anode voltage, anode current, screen grid voltage, screen grid current, grid current, grid voltage, incident power, and reflected power.

[0055] The PSM driver module takes the control signals from the SoC FPGA, drives the HFBR1414 fiber optic module through the SN75452 chip, converts the electrical signals into optical signals, and then drives the power supply of the PSM module of the high-voltage unit to turn on and off. At the same time, it receives the PSM power status signal (PSM on / off) from the HFBR2412, holds it through the SN75452, and then passes it to the SoC FPGA's I / O for reading.

[0056] The digital transceiver module acquires overcurrent and overvoltage signals from the high-voltage unit. Once the LM393 comparator detects an overcurrent or overvoltage fault, it compares the signal with a preset threshold and outputs an overcurrent or overvoltage protection signal. This then shuts down and blocks the PSM drive signal from the bottom layer, cuts off the high-voltage unit, and transmits the fault signal to the FPGA.

[0057] Overvoltage and overcurrent protection circuits can quickly disconnect the anode power supply system from the hardware level, ensuring the safety of the power supply and control system.

[0058] The high-voltage unit and the control unit are isolated by optical fiber, and the acquisition and control signals of the low-voltage control unit are isolated to protect the control unit from high-voltage interference.

[0059] like Figure 3 As shown, a higher voltage standing wave ratio (VSWR) indicates a higher transmitter reflected power and greater damage to the system. Therefore, this VSWR controller is designed to maintain a low VSWR as much as possible.

[0060] The output power of the high-voltage unit is adjusted by a voltage standing wave ratio (VSWR) controller; the VSWR is maintained between 1 and 2 using a voltage standing wave ratio (VSWR) controller.

[0061] The voltage standing wave ratio (VSWR) controller adjusts the output power of the high-voltage unit, wherein ( The incident power is P in and the reflected power is P ref .

[0062] When the standing wave ratio is greater than 1 and less than 2, adjust the output power while keeping the power required by the load constant. When the standing wave ratio is greater than 2 and less than 3, adjust the output power while keeping the reflected power constant. When the standing wave ratio is greater than 3, set the output power to 0.

[0063] Process of the voltage standing wave ratio controller: When 1 < VSWR < 2, adjust the output power Pset according to the constant load power. When 2 < VSWR < 3, adjust the output power Pset according to the constant reflected power. When VSWR > 3, the output power Pest is 0. When the output power is 90% of the forward power, the output power is adjusted according to VSWR and the constant load power Pset = Pset1; when the load conditions change drastically, the output power is set by the internal reference power Pset = Pset2 to ensure the stability of other operating parameters. The system judges whether the actual power is within the target range. If it meets the requirements, the setting of the anode voltage controller is adopted; otherwise, the setting of the VSWR controller is adopted, so as to achieve precise and rapid adjustment of the output power of the high-voltage unit, improve the system stability and response speed, and is applicable to industrial scenarios with high requirements for power adjustment accuracy.

[0064] As Figure 4 shown, by setting the anode voltage controller and adjusting the output power and anode voltage according to the anode power loss and screen grid current, it can ensure that the tetrode optimizes its working efficiency under normal working conditions.

[0065] Increase or decrease the anode voltage according to the screen grid current. When the screen grid current exceeds the upper limit, lower the anode voltage; when the screen grid current is at a normal level, increase the anode voltage.

[0066] Control the anode power loss to be below P APD _limit, and at the same time control the screen grid current not to exceed the threshold value; specifically, calculate the anode power loss P APD and judge whether it exceeds the threshold value P APD _limit. If it exceeds, reduce the output preset power Pset2 and the anode voltage Ua so that the anode power loss is below the threshold value P APD _limit.

[0067] At the same time, judge whether the screen grid current Is exceeds the rated screen grid current Is_nom. If it exceeds, further judge whether it exceeds the limit value Is_limit. If it exceeds the limit value Is_limit, reduce the output preset power Pset2 so that the screen grid current Is is maintained below the limit value Is_limit; otherwise, increase Pset2 to the expected value.

[0068] The decision to increase the anode voltage Ua is based on whether the screen grid current Is exceeds Is_nom+0.5, and to ensure that it does not exceed the maximum limit Ua_limit, thereby achieving precise regulation and protection of the high-voltage unit output. The maximum anode voltage is 27kV.

[0069] like Figure 5 As shown, the PSM module drives the controller:

[0070] The PSM control module includes a PSM module driver controller, which has a built-in FPGA algorithm program that controls the high and low levels of the IO pins according to requirements, and executes the PSM control module's turn-on and turn-off signals.

[0071] Based on the required anode voltage, the required duty cycle for each module is calculated, and PSM module power supply phase shift control is performed to improve ripple frequency.

[0072] Taking 6 modules as an example, Figure 5 Figure (a) shows a line graph of the control signals of the PSM module driver. The control signals of all six modules have a frequency of 1kHz and a duty cycle of 66.7%. The second module lags behind the first module by 1 / 6ms, and so on, with each module lagging behind the previous one by 1 / 6ms. The output voltage of the six modules connected in series is as follows: Figure 5 As shown in (b), the output voltage of a single module is U0, the average value after superposition is 5.5U0, the output voltage ripple is the voltage of a single module U0, the ripple frequency is 6kHz, and the duty cycle is 50%.

[0073] By adopting a phase-shift control strategy, each PSM module is set to have the same delay interval and voltage output duty cycle, thereby achieving phase-shift control of the PSM module power supply, which improves the ripple frequency of the high-voltage unit, reduces the requirements for energy storage components, and improves the power output quality.

[0074] The anode voltage control system includes:

[0075] The PSM module power supply includes a DC unit, a switch, and a bypass diode. Forty-five PSM module power supplies are connected in series to form a high-voltage unit.

[0076] The operating characteristic parameters of the PSM module power supply are obtained through the analog signal acquisition module;

[0077] The digital transceiver module responds to overcurrent and overvoltage signals from the PSM module power supply.

[0078] The FPGA module drives the PSM control module to control the PSM module power supply to turn on and off based on the operating characteristic parameters of the PSM module power supply and the parameters of the overcurrent and overvoltage signals.

[0079] A current sensor is used to detect the current of the high-voltage unit. The current is compared with a preset threshold by an LM393 comparator and an overcurrent or overvoltage signal is output. The digital transceiver module receives the overcurrent or overvoltage signal. If the current exceeds the preset threshold, the FPGA module shuts down and blocks the PSM drive signal, cutting off the high-voltage unit.

[0080] Furthermore, the operating characteristics include anode voltage, anode current, screen grid voltage, screen grid current, gate current, gate voltage, incident power, and reflected power.

[0081] Furthermore, the analog module uses two sets of LTC2325 chips, each with four acquisition channels and a sampling frequency of 5Mbps.

[0082] Furthermore, controlling the anode power loss at P APD Below the limit, the screen current is controlled to not exceed the threshold.

[0083] Furthermore, the PSM control module includes a PSM module driver controller, which has a built-in FPGA algorithm program to control the high and low levels of the IO pins according to requirements, and to execute the PSM control module turn-on and turn-off signals.

[0084] Based on the required anode voltage, the required output duty cycle of each PSM module power supply is calculated, and the phase shift control of the PSM module power supply is performed.

[0085] The anode voltage control system includes a control unit and a high-voltage unit. The control unit can acquire the status and parameters of the high-voltage unit in real time and control and protect the high-voltage unit as needed.

[0086] The high-voltage unit is formed by connecting forty-five PSM module power supplies in series.

[0087] The control unit includes:

[0088] The analog signal acquisition module includes an analog-to-digital conversion control circuit and a signal conditioning circuit, which is used to acquire anode voltage, anode current, screen grid voltage, screen grid current, grid current, grid voltage, incident power, and reflected power signals.

[0089] Digital transceiver module, used to acquire overcurrent and overvoltage signals from the high-voltage unit;

[0090] The PSM control module is a hardware circuit used to control the switching on and off of the PSM power supply. The PSM control module includes a PSM module driver controller, which has a built-in FPGA algorithm program that controls the high and low levels of the IO pins according to requirements to execute the PSM control module's on and off signals.

[0091] The SoC FPGA module is used to process the analog signals acquired by the analog acquisition module, read the power status of the PSM module of the digital transceiver module, drive the PSM module power on and off, and interact with the transmitter.

[0092] Furthermore, the high-voltage unit also includes a high-voltage resistance-capacitance measurement unit, a current sensor, and a current overcurrent protection module. The high-voltage resistance-capacitance measurement unit is used to detect the voltage of the high-voltage unit, and the current sensor is used to detect the current of the high-voltage unit.

[0093] The current of the high-voltage unit is compared by the overcurrent protection module, and the compared parameter signal is sent to the digital transceiver module. If an abnormality is found after comparison, the abnormality signal is sent to the PSM control module.

[0094] The anode voltage control system also includes a transmitter and a soft starter cabinet. The transmitter includes a reset module, a switch control module, and a soft starter circuit.

[0095] The reset module requires the transmitter to reset the FPGA when the anode high voltage unit needs to be restarted.

[0096] Switch control module; used for the on / off control of high voltage units.

[0097] The soft starter cabinet is used to control the magnitude of the surge current and the slope of the output voltage rise when the switching power supply starts. If overvoltage, overcurrent or other faults occur, the protection mechanism is triggered and the control system is locked.

[0098] It is worth noting that the various units included in the above system embodiments are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of the present invention.

[0099] Furthermore, those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware, and the corresponding program can be stored in a computer-readable storage medium, such as ROM / RAM, disk, or optical disk.

[0100] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to the specific embodiments described. Obviously, many modifications and variations are possible based on the content of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-voltage unit control method, characterized in that, include: The PSM module power supply includes a DC unit, a switch, and bypass diodes. Forty-five bypass diodes of the PSM module power supply are connected in series to form a high-voltage unit. The operating characteristic parameters of the high-voltage unit are obtained through the analog quantity acquisition module; The digital transceiver module acquires overcurrent and overvoltage protection signals from the high-voltage unit; The FPGA module adjusts the output voltage and the output power required by the amplifier according to the operating characteristic parameters of the high-voltage unit; when the high-voltage unit experiences overcurrent or overvoltage faults, the high-voltage unit is disconnected at the hardware level, and a signal is sent to the FPGA module to block it at the software level. The operating characteristics include anode voltage Ua, anode current Ia, screen grid voltage Us, screen grid current Is, gate voltage Ug, gate current Ig, incident power Pin, and reflected power Pref; The output power of the high-voltage unit is adjusted by a voltage standing wave ratio (VSWR) controller; the VSWR is maintained between 1 and 2 using a voltage standing wave ratio (VSWR) controller. When the VSWR is greater than 1 and less than 2, the output power of the high-voltage unit is adjusted to keep the power required by the load constant. When the VSWR is greater than 2 and less than 3, the output power is adjusted to keep the reflected power constant. When the VSWR is greater than 3, the output power is set to 0.

2. The high-voltage unit control method according to claim 1, characterized in that, A current sensor is used to detect the current of the high-voltage unit. The current is compared with a preset threshold by an LM393 comparator and an overcurrent or overvoltage signal is output. The digital transceiver module receives the overcurrent or overvoltage signal. If the current exceeds the preset threshold, the FPGA module shuts down and blocks the PSM control signal, cutting off the high-voltage unit.

3. The high-voltage unit control method according to claim 1, characterized in that, The analog module uses two sets of LTC2325 chips, each with four acquisition channels, for a total of eight channels and a sampling rate of 5Mbps, for real-time acquisition of the operating characteristic parameters of the high-voltage unit.

4. The high-voltage unit control method according to claim 1, characterized in that, Controlling anode power loss at P APD Below the limit, the screen current is controlled to not exceed the threshold. Calculate the anode power loss P APD And determine whether it exceeds the threshold P. APD If the limit is exceeded, the output preset power Pset2 and anode voltage Ua will be reduced so that the anode power loss is within the threshold P. APD Below _limit; Simultaneously, it is determined whether the screen grid current Is exceeds the rated value Is_nom. If it does, it is further determined whether it exceeds the limit value Is_limit. If it exceeds the limit value Is_limit, the output preset power Pset2 is reduced so that the screen grid current Is is kept below the limit value Is_limit. Otherwise, Pset2 is increased to the desired value. Whether to increase the anode voltage Ua depends on whether the screen grid current Is exceeds Is_nom+0.5, and ensures that it does not exceed the maximum limit Ua_limit, which is 27kV.

5. The high-voltage unit control method according to claim 1, characterized in that: The PSM control module includes a PSM module driver controller, which has a built-in FPGA algorithm program to control the high and low of the IO pins according to requirements, and execute the PSM control module turn-on and turn-off signals. Based on the required anode voltage, the required output duty cycle of each PSM module power supply is calculated, and the phase shift control of the PSM module power supply is performed.

6. An anode voltage control system, using the high-voltage unit control method as described in claim 1, characterized in that, Includes control unit and high voltage unit: The high-voltage unit is formed by forty-five PSM module power supplies; The control unit includes: An analog signal acquisition module, comprising an analog-to-digital conversion control circuit and a signal conditioning circuit, is used to acquire signals of anode voltage Ua, anode current Ia, screen grid voltage Us, screen grid current Is, gate voltage Ug, gate current Ig, incident power Pin, and reflected power Pref. A digital transceiver module, which is used to receive fault signals such as overcurrent and overvoltage from the high-voltage unit; The PSM control module is used to drive the PSM module power supply to turn on and off, thereby regulating the anode voltage. The SoC FPGA module is used to process the analog signals acquired by the analog acquisition module, read the power status of the PSM module of the digital transceiver module, control the power on and off of the PSM module, and interact with the transmitter.

7. The anode voltage control system according to claim 6, characterized in that, The high-voltage unit also includes a high-voltage resistance-capacitance measurement unit, a current sensor, and a current overcurrent protection module. The high-voltage resistance-capacitance measurement unit is used to detect the voltage of the high-voltage unit, and the current sensor is used to detect the current of the high-voltage unit. The current of the high-voltage unit is compared by the overcurrent protection module, and the compared parameter signal is sent to the digital transceiver module. If an abnormality occurs, the abnormal signal is sent to the PSM control module.

8. The anode voltage control system according to claim 6, characterized in that, It also includes a transmitter and a soft starter cabinet. The transmitter includes a reset module, a switch control module, and a soft starter circuit. The reset module requires the transmitter to reset the FPGA when the high-voltage unit needs to be restarted. Switch control module; Used for the on / off control of high-voltage units; The soft starter cabinet is used to control the magnitude of the surge current and the slope of the output voltage rise when the switching power supply starts. If overvoltage, overcurrent or other faults occur, the protection mechanism is triggered and the control system is locked.

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