Method and device for dynamically adjusting bus voltage difference of double-range direct-current high-voltage power supply and medium

Abstract

The invention relates to a double-range direct-current high-voltage power supply bus voltage difference dynamic adjusting method and device and a medium, and the method comprises the steps: setting an output target and a safety tube voltage difference range of a power adjusting tube; synchronously sampling real-time tube voltage difference, and sampling output voltage and current by adopting a double-range strategy; the preceding-stage commercial power input voltage is dynamically adjusted through the first closed loop, so that the real-time tube voltage difference is maintained in a safe range, and the withstand voltage safety of the power tube is ensured; a control signal is generated through a second closed loop based on a high-precision given signal synthesized by the double-range DAC and a sampling feedback error to linearly adjust a power tube, so that output high-precision constant voltage or constant current control is realized; the precision is improved through double-range acquisition and control, the voltage-withstanding limitation of a power tube is broken through by utilizing bus voltage difference dynamic adjustment, and high-voltage, low-ripple, full-linear and high-safety direct-current power supply output is realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply regulation, and particularly relates to a dual-range DC high-voltage power supply bus voltage difference dynamic regulation method, device and medium. BACKGROUND

[0002] DC high-voltage linear power supply has irreplaceable role in the fields of precision instruments, medical equipment, scientific research experiments and the like due to its low output ripple, small noise, good dynamic response and the like. The traditional linear high-voltage power supply technical scheme adopts a structure of pre-stage switching power supply pre-regulation and post-stage linear regulation, which can reduce the power consumption of the regulating tube, but introduces switching noise, which destroys the pure linear characteristic of the output; a fixed high-voltage bus input is adopted, and the post-stage completely relies on the power regulating tube to bear all voltage regulation and power dissipation, which not only requires the power tube to have an extremely high withstand voltage level, resulting in a dramatic increase in cost, but also works in a high-voltage difference state, which is extremely low in efficiency, generates a large amount of heat, and challenges the system reliability; a high voltage is obtained through a series superposition mode of multiple low-voltage outputs, which has a complex circuit, poor precision and control coordination, and is difficult to realize fast and smooth continuous regulation.

[0003] Therefore, there is a lack of a high-voltage DC power supply scheme in the prior art which can simultaneously realize full linear pure DC output, efficient and safe operation in a wide range, and controllable cost, and how to safely output higher voltage without using an ultra-high voltage power tube and maintain high precision and low ripple characteristics in the process is a technical problem to be solved in the field. SUMMARY

[0004] The main purpose of the present application is to provide a dual-range DC high-voltage power supply bus voltage difference dynamic regulation method, which improves precision through dual-range acquisition and control, and breaks through the withstand voltage limit of the power tube by using bus voltage difference dynamic regulation, thereby realizing high-voltage, low-ripple, full-linear, high-safety DC power supply output.

[0005] To achieve the above purpose, the present application provides a dual-range DC high-voltage power supply bus voltage difference dynamic regulation method, comprising the following steps: setting a target voltage value or a target current value of a DC high-voltage output, and pre-setting a safe tube voltage difference range of a power regulating tube; sampling an input bus voltage and an output voltage of the power regulating tube to obtain a real-time tube voltage difference, and simultaneously sampling a real-time voltage value and a real-time current value of the DC high-voltage output through a dual-range sampling strategy; comparing the real-time tube voltage difference with the safe tube voltage difference range, and dynamically regulating a pre-stage commercial AC input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range; The target given signal is generated by using a dual-range DAC synthesis strategy, and an error processing is performed to generate a control signal used for adjusting the on state of the power regulating tube.

[0006] Further, the step of setting the target voltage value or target current value of the DC high voltage output and pre-setting the safe tube pressure difference range of the power regulating tube comprises: According to the user instruction or preset program, the target voltage value or target current value of the DC high voltage output is set; According to the device parameters of the selected power regulating tube, the safe tube pressure difference range is dynamically calculated and set, wherein the upper limit value of the safe tube pressure difference range is less than the maximum rated withstand voltage value of the power regulating tube, and the upper limit value is set to dynamically decrease with the increase of the output target value.

[0007] Further, the step of synchronously sampling the real-time voltage value and real-time current value of the DC high voltage output by using a dual-range sampling strategy comprises: The voltage output of the DC high voltage is divided to obtain a first proportional voltage signal and a second proportional voltage signal, wherein the first proportional voltage signal corresponds to the low-range part of the DC high voltage output, and the second proportional voltage signal corresponds to the high-range part of the DC high voltage output; The first proportional voltage signal and the second proportional voltage signal are synchronously sampled and converted by using independent analog-to-digital conversion channels; The converted low-range voltage signal and high-range voltage signal are calibrated based on a preset proportional coefficient to obtain a real-time voltage value.

[0008] Further, the step of comparing the real-time tube pressure difference with the safe tube pressure difference range and dynamically adjusting the front-stage commercial AC input voltage to maintain the real-time tube pressure difference within the safe tube pressure difference range according to the comparison result comprises: According to the comparison result of the real-time tube pressure difference and the safe tube pressure difference range, a voltage regulation instruction is generated; Based on the voltage regulation instruction, the conduction angle in the adjustable circuit arranged between the commercial input and the power frequency transformer is adjusted, and the effective value of the AC voltage of the primary side of the power frequency transformer is dynamically changed by adjusting the conduction angle; By changing the effective value of the AC voltage of the primary side, the input bus voltage of the power regulating tube after rectification and filtering is correspondingly increased or decreased to maintain the real-time tube pressure difference within the safe tube pressure difference range.

[0009] Further, the step of generating the target given signal by using a dual-range DAC synthesis strategy comprises: generating a first given signal by a first digital-to-analog converter, the first given signal corresponding to a low-weight part of the target voltage value or target current value; generating a second given signal by a second digital-to-analog converter, the second given signal corresponding to a high-weight part of the target voltage value or target current value; weighting and synthesizing the first given signal and the second given signal, and calibrating to a voltage range adapted to a feedback signal to obtain a total target given signal; comparing the total target given signal with a feedback signal converted from the real-time voltage value or real-time current value to obtain an error signal.

[0010] Further, the step of generating a control signal by performing error processing, the control signal being used to adjust the conduction state of the power regulation tube, comprises: performing proportional-integral-derivative operation on the error signal to generate an analog error amplification signal; comparing the analog error amplification signal with a preset amplitude limiting threshold value: when the error amplification signal exceeds the amplitude limiting threshold value, outputting a constant saturated drive signal; when the error amplification signal does not exceed the amplitude limiting threshold value, converting the error amplification signal into a corresponding pulse width modulation signal; using the saturated drive signal or the pulse width modulation signal as the control signal to drive the conduction resistance between the gate and the drain-source of the power regulation tube to perform linear regulation, and drive the dynamic DC high voltage output to stabilize the target voltage value or target current value.

[0011] Further, the step of driving the conduction resistance between the gate and the drain-source of the power regulation tube to perform linear regulation comprises: controlling the power regulation tube to always work in a linear amplification region, continuously and smoothly adjusting the linear variation of the gate voltage and the conduction resistance between the drain and the source of the power regulation tube through the control signal to perform continuous linear regulation of the DC high voltage output voltage or current; In the process of the continuous linear regulation, the front stage of the power supply performs high voltage output through the functions of a power frequency transformer for voltage boosting, a rectification and filter unit for rectification, and the linear amplification of the power regulation tube, to obtain a full linear DC high voltage output.

[0012] The application also provides a dual-range DC high voltage power supply bus voltage difference dynamic regulation device, comprising: a parameter setting and main control module, used for setting a target voltage value or target current value of a DC high voltage output, and a safe tube voltage difference range of a power regulation tube; A sampling module is configured to acquire a real-time pipe pressure difference, and to synchronously acquire a real-time voltage value and a real-time current value through a double-range sampling strategy. A bus voltage difference closed-loop execution module is configured to dynamically adjust an effective value of an alternating current voltage input to a primary side of a power frequency transformer in response to a voltage regulation instruction. An output closed-loop control module is configured to generate a high-precision target given signal through a double-range DAC synthesis strategy, and to generate a driving signal to adjust a conduction state of the power regulation pipe based on an error between the real-time voltage value or the real-time current value and the target given signal.

[0013] The application further provides a computer device, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to realize the steps of the bus voltage difference dynamic regulation of the double-range DC high-voltage power supply.

[0014] The application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the steps of the bus voltage difference dynamic regulation of the double-range DC high-voltage power supply. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a whole system architecture diagram of a linear high-voltage DC source in an embodiment of the application; Figure 2 is a power MOS pipe regulation unit and constant voltage control associated circuit principle diagram in an embodiment of the application; Figure 3 is a power MOS pipe gate control and ADC linkage circuit principle diagram in an embodiment of the application; Figure 4 is a rectification filter unit circuit principle diagram in an embodiment of the application; Figure 5 is an output filter unit circuit principle diagram in an embodiment of the application; Figure 6 is a bus sampling control unit double-path acquisition circuit principle diagram in an embodiment of the application; Figure 7 is a commercial voltage regulation unit circuit principle diagram in an embodiment of the application; Figure 8 is a bus voltage difference dynamic regulation method flow chart of a double-range DC high-voltage power supply in an embodiment of the application; Figure 9 is a structure block diagram of a bus voltage difference dynamic regulation device of a double-range DC high-voltage power supply in an embodiment of the application; The realization of the object, the functional features and the advantages of the application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0017] Reference Figure 8 This is a flowchart illustrating a method for dynamic adjustment of bus differential voltage in a dual-range DC high-voltage power supply proposed in this invention, comprising the following steps: S1, set the target voltage or target current value for DC high voltage output, and preset the safe voltage difference range of the power regulator tube; S2, sample the input bus voltage and output voltage of the power regulating tube to obtain the real-time tube voltage difference, and simultaneously sample the real-time voltage and real-time current values ​​of the DC high voltage output through a dual-range sampling strategy; S3, compare the real-time tube voltage difference with the safe tube voltage difference range, and dynamically adjust the front-end AC mains input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range; S4. A target given signal is generated using a dual-range DAC synthesis strategy. An error processing is performed to generate a control signal, which is used to adjust the conduction state of the power regulation tube.

[0018] As described in step S1 above, user commands are received through the human-machine interface of the control screen, or parameter configurations in a preset program are called, and transmitted to the main control unit via the isolated communication unit. The target voltage or target current value of the DC high voltage output is determined and stored. Simultaneously, in conjunction with Figure 2... Figure 3 The device parameters of Q1 in the 146 power regulation unit are dynamically calculated to determine the safety tube voltage difference range. Its upper limit is less than the maximum rated withstand voltage of the MOSFET, and it dynamically decreases according to the increasing trend of the output target value, adapting to the 3-level voltage difference reference design of the mains voltage regulation unit. Furthermore, through... Figure 2 The R28 resistor around the 151 constant voltage control unit pulls the bus voltage sampling signal high by default, ensuring that the high voltage output maintains the preset low voltage value when the power board and AC voltage adjustment board are disconnected, forming a safety redundancy. This solves the problems of excessive safety redundancy, large voltage difference power consumption of MOSFETs, or insufficient withstand voltage that are prone to breakdown caused by traditional fixed voltage difference settings.

[0019] As described in step S2 above, dual-channel acquisition is achieved through the bus sampling control unit. The first part uses a differential sampling circuit to capture the total input bus voltage, and the second part accurately acquires the voltage difference between the bus and the output terminal by connecting a resistor voltage divider to AGND. Simultaneously, the dual-range sampling mechanism of the ADC acquisition unit is activated. Figure 1The two independent analog-digital conversion channels of the middle 154 ADC acquisition unit synchronously acquire the 10% low-range signal and the 90% high-range signal of the direct-current high-voltage output respectively, the sampling clock is strictly synchronized to ensure the consistency of the data timing, and after acquisition, the data is calibrated based on the preset proportion coefficient and synthesized, finally the high-precision real-time voltage value and the real-time current value are obtained, which solves the problems of insufficient sampling precision of traditional single-range, large interference of differential sampling in high-voltage scene, and asynchronous sampling of voltage and current, and provides safe state data for bus differential dynamic regulation.

[0020] As described in step S3 above, the real-time pipe differential data collected in step S2 is received by the main control unit, and a difference operation is performed with the preset safe range: when the real-time differential exceeds the upper limit, a voltage reduction instruction is generated; when it is lower than the lower limit, a voltage increase instruction is generated; and when it is within the range, the current instruction is maintained. The instruction is transmitted to the mains voltage regulation unit through isolation control, and by adjusting the conduction angle of the core device DT1 thyristor or silicon controlled rectifier, the output voltage and current are dynamically changed Figure 1 The effective value of the alternating current voltage of the primary side of the middle 143 power frequency transformer is rectified by the transformer step-up and rectifier filter unit, and the input bus voltage of the MOS tube is adjusted synchronously. During the adjustment process, the 3-gear preset differential reference voltage value is automatically switched, and the bus voltage default pull-up design of the R28 resistor ensures that the power board and the AC voltage adjustment board still maintain low-voltage safe output when they are disconnected. This method solves the problems of insufficient MOS tube withstand voltage and easy breakdown caused by traditional fixed bus voltage, and realizes the dual goals of safe operation and low-power operation of the MOS tube.

[0021] As described in step S4 above, the dual-range cooperative mechanism is started by the DAC synthesis unit, and the low-weight signal corresponding to the target value of 10% and the high-weight signal corresponding to the target value of 90% are generated by two independent digital-to-analog converters. After weighted synthesis and calibration to the range suitable for the feedback signal, a high-resolution target given signal is obtained. Then, the signal is subjected to a difference operation with the real-time voltage and current feedback signals collected in S2, and a proportional-integral-derivative (PID) operation is performed on the error signal to amplify it. According to the comparison result of the error amplitude and the preset amplitude threshold, when the error exceeds the threshold, a saturated driving signal is dynamically output, and when the error is within the threshold, a pulse width modulation signal is dynamically output as a control signal to drive the MOS tube gate. By continuously adjusting the on-resistance of the MOS tube in the linear amplification region, linear and smooth adjustment of the output voltage and current is realized, which solves the problems of insufficient control precision and large output ripple of traditional single-range control, and finally realizes high-precision, low-ripple and full-linear high-voltage output beyond the rated withstand voltage of the MOS tube.

[0022] In one embodiment, the step S1 of setting the target voltage value or the target current value of the direct-current high-voltage output and presetting the safe tube differential range of the power regulation tube includes: S11, Receive and confirm the output target value input by the user through the human-machine interface or specified by the preset program; S12, based on the output target value, query or calculate the corresponding safety pipe differential pressure reference value; S13, Based on the safety pipe differential pressure reference value and a preset safety factor, determine and load the safety pipe differential pressure range for closed-loop control.

[0023] In the specific implementation process, through Figure 1 The main control unit and control screen work together to execute the commands. The user inputs the target voltage or target current value through the human-machine interface on the control screen, and these values ​​are processed... Figure 1 The intermediate isolation communication unit transmits data to the main control unit, achieving safety isolation between the high-voltage section and the operating interface. If the user does not manually input any parameters, the main control unit automatically calls the default parameter configuration from the preset program. The main control unit reads the stored parameters. Figure 2 , Figure 3 The Q1 parameter of the middle module, including the maximum rated withstand voltage, is used by the main control unit to calculate the corresponding safety voltage drop reference value based on the target value by calling an internal preset algorithm or lookup table. This algorithm ensures the safe operation of the power regulator, and the reference value dynamically decreases as the output target value increases. Simultaneously, the lower limit is set as the critical value to meet the low-dropout, low-power operation of the MOSFET. Then, the main control unit multiplies the reference value by a preset safety factor of 0.8 to determine the upper limit of the safety voltage drop range, combines it with the low-power lower limit to form a complete range, and loads this range into its register. Simultaneously, hardware safety redundancy design is activated. Figure 2 The R28 resistor in the middle pulls the bus voltage sampling signal high by default, ensuring a safe low-voltage output when the connection between the power board and the AC voltage adjustment board is disconnected. Finally, the main control unit synchronizes the target value and the safety tube differential voltage range to the DAC synthesis unit, constant voltage control unit, and constant current control unit, providing a reference for the comparison stage in S3 and the output control stage in S4 in subsequent steps.

[0024] In one embodiment, step S2, which involves sampling the input bus voltage and output voltage of the power regulating tube to obtain the real-time tube voltage difference and simultaneously sampling the real-time voltage and current values ​​of the DC high-voltage output using a dual-range sampling strategy, includes: S21, Dual-path isolated acquisition of bus differential pressure; S22, dual-range synchronous sampling output voltage and current; S23, calibrate and synthesize the sampled data.

[0025] In the specific implementation process, step S2 is achieved through... Figure 1The bus sampling control unit in the application cooperates with the ADC acquisition unit to perform sampling, and the whole sampling link adopts isolated communication design to block high-voltage interference. The bus sampling control unit works according to a double-channel acquisition logic, and a first differential sampling circuit thereof acquires the input bus total voltage output by the rectifier filtering unit, that is, the HV+ end in the application Figure 6 The second resistive voltage dividing network thereof acquires the potential difference between the HVO+ end of the output capacitor filtering unit in the application and Figure 5 The difference is the real-time drain-source voltage difference of Q1, and the two analog signals are sent to the main control unit after being conditioned by an isolation amplifier. Meanwhile, the ADC acquisition unit performs a double-range sampling strategy: for the output voltage, one analog-to-digital conversion channel thereof acquires a low-range signal accounting for about 10% of the output voltage after resistive voltage division, and the other channel synchronously acquires a high-range signal accounting for about 90%, and the two channels are triggered by the same timer of the main control unit to realize sampling clock synchronization; for the output current, the voltage drop across the sampling resistor RT2 in the current limiting control unit in the application is acquired. Figure 1 After the main control unit receives the above signals, it performs digital calibration and weighted synthesis on the two-channel voltage sampling data based on the pre-calibrated high-range and low-range voltage division ratio coefficients to obtain a high-precision real-time voltage value. The real-time voltage value obtained after synthesis, the real-time current value, and the real-time tube voltage difference are stored in the cache area of the main control unit at an update rate of 1 kHz to form a real-time data set for the tube voltage difference comparison in step S3 and the error calculation in step S4.

[0026] In one embodiment, the step S3 of comparing the real-time tube voltage difference with the safe tube voltage difference range and dynamically adjusting the front-stage commercial AC input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range comprises: S31, comparing the real-time tube voltage difference with the safe tube voltage difference range; S32, generating a voltage regulation instruction according to the comparison result; S33, performing front-stage AC voltage regulation.

[0027] In the specific implementation process, the step S3 is cooperatively performed by the bus sampling control unit, the main control unit in the application, and the commercial voltage regulation unit in the front stage to dynamically stabilize the power tube voltage difference by regulating the front-stage AC input. The main control unit reads the real-time tube voltage difference data provided by step S2, that is, the high voltage HV+ output by the rectifier filtering unit in the application and Figure 4 Figure 5 ​The difference between the output voltage HVO+ of the intermediate output filter unit and the real-time voltage difference is compared with the loaded safety tube voltage difference range. The comparison logic is as follows: if the real-time tube voltage difference is higher than the upper limit of the range, a "decrease" command is generated; if it is lower than the lower limit, a "boost" command is generated; if it is within the range, the current command is maintained. The main control unit generates a digital voltage regulation command based on the comparison result, and the command is sent to the mains voltage regulation unit via isolated communication. Figure 7 As shown, after receiving the command, the unit generates a trigger pulse with a variable phase that is synchronized with the zero-crossing point of the mains power through its internal circuitry, such as U1, U2, and their surrounding resistor network, to drive the mains power. Figure 7 The OC1-OC3 optocoupler thyristors in the 141 mains voltage regulation unit precisely control the conduction angle of the bidirectional thyristor DT1, which serves as the main power device. By changing the conduction angle of the bidirectional thyristor DT1, the effective value of the AC voltage applied to the primary side of the subsequent power frequency transformer is continuously adjusted. This voltage change is then stepped up by the transformer and... Figure 4 The rectifier and filter unit (containing components such as D5-D8) processes the signal, ultimately resulting in the output being sent to... Figure 2 When the input bus voltage HV+ at the drain of the medium-power regulating transistor Q1 increases or decreases accordingly, and since the output voltage HVO+ at the source of Q1 is independently controlled by its gate in the subsequent S4 step, the change in HV+ will immediately cause a reverse change in the real-time voltage difference of Q1. Through this closed loop, the system dynamically stabilizes the real-time voltage difference within a preset safe range, thereby ensuring that the power regulating transistor always operates in a safe and efficient linear region.

[0028] In one embodiment, step S4, which involves generating a target given signal using a dual-range DAC synthesis strategy and generating a control signal through error processing, wherein the control signal is used to adjust the conduction state of the power regulation transistor, includes: S41, dual-range DAC synthesizes the target given signal; S42, collects real-time feedback signals; S43, perform error calculation and processing; S44 generates a power regulation command; S45 drives the power regulating tube to perform linear regulation.

[0029] In the specific implementation process, the main control unit instructs the DAC synthesis unit to operate according to the preset output constant voltage or constant current target mode. The unit adopts a dual-channel DAC architecture and follows a dual-range precision synthesis design: the first channel outputs a low-weight precision voltage corresponding to 10% of the target value, and the second channel outputs a high-weight reference voltage corresponding to 90% of the target value. The two signals are transmitted via... Figure 2 Zhong 151 constant pressure control unit or Figure 3The weighted summation circuit composed of the precision operational amplifier in the constant current control unit 150 superimposes, the principle can be referred to the operational amplifier configuration in Figure 2 or Figure 3 , the synthesized calibration is adapted to the voltage range of the feedback signal, and finally generates the total target given signal V_ref with high resolution and high linearity. The signal is fed into the same phase input terminal of the error amplifier in the constant voltage control unit and the constant current control unit. At the same time, the main control unit receives the high-precision real-time voltage value and real-time current value synthesized after calibration by step S2 from the ADC acquisition unit as system feedback. According to the working mode, the system selects the corresponding feedback path for error processing: in the constant voltage mode, the real-time voltage value is sent to the constant voltage control unit, and the error amplifier of the unit compares and proportional-integral-differential (PID) operation of the feedback voltage and V_ref, and outputs the error voltage V_error_V, the circuit structure can be referred to the differential amplification and integration network composed of operational amplifier and resistor in Figure 3 . In the constant current mode, the real-time current value converted by the RT2 sampling resistance voltage drop in the current limiting control unit in Figure 1 is sent to the constant current control unit, and the error amplifier of the unit compares and PID operation of the current feedback signal and V_ref, and outputs the error voltage V_error_I. The generated error voltage V_error_V or V_error_I is sent to the gate drive circuit of the power regulation unit, which is matched with the module circuit in Figure 2 , Figure 3 , the drive circuit includes an optocoupler isolation module, a transistor buffer stage and a level shift circuit, which isolates the control part from the high-voltage part through the optocoupler to avoid damage to the control circuit caused by high-voltage interference; after the circuit receives the error voltage, it combines the preset amplitude threshold value to judge: when the error exceeds the threshold value, the saturated drive level is output, and when the error does not exceed the threshold value, the linearly adjusted drive signal is output, and finally the voltage signal V_gs directly driving the gate of Q1 is generated, and V_gs signal controls Q1 to ensure that it always works in the linear amplification region, and linearly adjusts the drain-source resistance, which directly changes the voltage HVO+ at both ends of the output filter unit composed of capacitors, resistors and diodes in series and parallel in Figure 5 . After filtering out the ripple through the filter unit, the final DC high-voltage output converges quickly and stably to the set target value. During the adjustment process, the main control unit receives the MOS tube source-drain voltage difference data transmitted by the bus sampling control unit in real time to avoid the MOS tube voltage difference exceeding the safe range; if Figure 1 the overvoltage and overcurrent signals are detected by the protection control unit in

[0030] Referring to Figure 9 , the structure schematic block diagram of the dual-range DC high-voltage power supply bus voltage difference dynamic adjustment device of an embodiment of the application comprises: A parameter setting and master control module is configured to set a target voltage value or a target current value of a DC high voltage output and a safety tube voltage difference range of a power regulating tube; A sampling module is configured to acquire a real-time tube voltage difference and synchronously acquire a real-time voltage value and a real-time current value through a double-range sampling strategy; A bus voltage difference closed-loop execution module is configured to dynamically adjust an effective value of an alternating current voltage input to a primary side of the power frequency transformer in response to the voltage regulating instruction; An output closed-loop control module is configured to generate a high-precision target given signal through a double-range DAC synthesis strategy, and generate a driving signal to adjust a conduction state of the power regulating tube based on an error between the real-time voltage value or the real-time current value and the target given signal.

[0031] To sum up, the application sets an output target value by a master control unit and a control screen, dynamically calculates a safety tube voltage difference range in combination with MOS tube parameters, and builds a safety reference through hardware redundancy design; then, the MOS tube voltage difference is collected by a bus sampling control unit, the ADC acquisition unit synchronously samples output voltage and current through a 10% / 90% double-range strategy to generate high-precision feedback data; then, the voltage difference data are compared, the primary side voltage of the power frequency transformer is adjusted by driving a thyristor, and multiple reference switches are linked to stabilize the MOS tube voltage difference in a safe low-power consumption range; finally, a target signal is generated through DAC double-range synthesis, a control signal is generated through PID operation, the MOS tube is driven to work in a linear region, and the output characteristics are optimized by an output filter unit. The application takes double-closed-loop cooperation, isolation design and double-range strategy as the core, breaks through the voltage resistance limit of a general MOS tube at low cost, realizes low-ripple full-linear high-voltage output with overrated voltage resistance, solves the pain points of non-full-linearity and high cost of a traditional scheme, and takes into account safety and precision.

[0032] An embodiment of the application further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to realize the method. It can be understood that the computer readable storage medium in the embodiment can be a volatile readable storage medium or a non-volatile readable storage medium.

[0033] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, storage, database or other medium provided by the present application and used in the embodiments can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM, etc.

[0034] It should be noted that in this document, the terms "comprising", "including", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, device, article or method that comprises a list of elements does not only include those elements, but can also include other elements not expressly listed or inherent to such process, device, article or method. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, device, article or method that includes the element.

[0035] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, based on the content of the present application specification and drawings, are also included in the patent protection scope of the present application.

Claims

1. A method for dynamic adjustment of bus differential voltage in a dual-range DC high-voltage power supply, characterized in that, Includes the following steps: Set the target voltage or target current value for the DC high voltage output, and preset the safe voltage difference range of the power regulator tube; The input bus voltage and output voltage of the power regulating tube are sampled to obtain the real-time tube voltage difference. Simultaneously, the real-time voltage and real-time current values ​​of the DC high voltage output are sampled through a dual-range sampling strategy. The real-time tube voltage difference is compared with the safe tube voltage difference range, and the upstream AC mains input voltage is dynamically adjusted according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range; A target given signal is generated using a dual-range DAC synthesis strategy. An error processing is performed to generate a control signal, which is used to adjust the conduction state of the power regulation transistor.

2. The method for dynamic adjustment of bus differential voltage of dual-range DC high-voltage power supply according to claim 1, characterized in that, The steps of setting the target voltage or target current value for the DC high voltage output and preset the safety differential voltage range of the power regulating tube include: According to user instructions or preset programs, the target voltage or target current value of the DC high voltage output is set; Based on the device parameters of the selected power regulating tube, the safety tube differential pressure range is dynamically calculated and set, wherein the upper limit of the safety tube differential pressure range is less than the maximum rated withstand voltage of the power regulating tube, and the upper limit is set to dynamically decrease as the output target value increases.

3. The method for dynamic adjustment of bus differential voltage of a dual-range DC high-voltage power supply according to claim 1, characterized in that, The step of synchronously sampling the real-time voltage and current values ​​of the DC high-voltage output using a dual-range sampling strategy includes: The voltage output of the DC high voltage is divided to obtain a first proportional voltage signal and a second proportional voltage signal, wherein the first proportional voltage signal corresponds to the low range portion of the DC high voltage output and the second proportional voltage signal corresponds to the high range portion of the DC high voltage output. The first proportional voltage signal and the second proportional voltage signal are synchronously sampled and converted through independent analog-to-digital conversion channels; The converted low-range voltage signal and the high-range voltage signal are calibrated based on a preset scaling factor and then synthesized to obtain the real-time voltage value.

4. The method for dynamic adjustment of bus differential voltage of dual-range DC high-voltage power supply according to claim 1, characterized in that, The step of comparing the real-time tube voltage difference with the safe tube voltage difference range, and dynamically adjusting the upstream AC mains input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range, includes: Based on the comparison between the real-time pipe pressure difference and the safety pipe pressure difference range, a pressure regulation command is generated; Based on the voltage regulation command, the conduction angle in the adjustable circuit between the mains input and the power frequency transformer is adjusted, and the effective value of the AC voltage on the primary side of the power frequency transformer is dynamically changed by adjusting the conduction angle. By changing the effective value of the AC voltage on the primary side, the input bus voltage of the power regulating tube generated after rectification and filtering is increased or decreased accordingly, thereby maintaining the real-time tube voltage difference within the safe tube voltage difference range.

5. The method for dynamic adjustment of bus differential voltage of dual-range DC high-voltage power supply according to claim 1, characterized in that, The step of generating the target given signal using a dual-range DAC synthesis strategy includes: A first given signal is generated by a first digital-to-analog converter, the first given signal corresponding to the low-weight portion of the target voltage value or target current value; A second given signal is generated by a second digital-to-analog converter, the second given signal corresponding to the high-weighted portion of the target voltage value or target current value; The first given signal and the second given signal are weighted and synthesized, and then calibrated to a voltage range that matches the feedback signal to obtain the total target given signal; The error signal is obtained by comparing the total target given signal with the feedback signal obtained by converting the real-time voltage value or real-time current value.

6. The method for dynamic adjustment of bus differential voltage of dual-range DC high-voltage power supply according to claim 5, characterized in that, The step of generating a control signal by performing error processing, wherein the control signal is used to adjust the conduction state of the power regulating transistor, includes: Perform proportional-integral-differential operations on the error signal to generate an analog error amplification signal; The amplified analog error signal is compared with a preset amplitude limiting threshold: When the error amplification signal exceeds the amplitude limiting threshold, a constant saturation drive signal is output; When the error amplification signal does not exceed the amplitude limiting threshold, the error amplification signal is converted into a corresponding pulse width modulation signal; Using the saturation drive signal or the pulse width modulation signal as the control signal, the on-resistance between the gate and drain-source of the power regulating transistor is linearly adjusted, thereby driving the DC high voltage output to stabilize the target voltage value or target current value.

7. The method for dynamic adjustment of bus differential voltage of dual-range DC high-voltage power supply according to claim 6, characterized in that, The step of linearly adjusting the on-resistance between the gate and drain-source of the power regulating transistor includes: The power regulator is controlled to always operate in the linear amplification region. The linear changes in the gate voltage and drain-source on-resistance of the power regulator are continuously and smoothly adjusted by the control signal to achieve continuous linear regulation of the DC high voltage output voltage or current. During the continuous linear adjustment process, the power supply's front stage achieves high-voltage output through the step-up of the power frequency transformer, rectification by the rectifier and filter unit, and linear amplification by the power regulation tube, thus obtaining a fully linear DC high-voltage output.

8. A dual-range DC high-voltage power supply bus differential voltage dynamic adjustment device, characterized in that, include: The parameter setting and main control module is used to set the target voltage or target current value of the DC high voltage output, as well as the safety tube differential voltage range of the power regulation tube. The sampling module is used to obtain real-time tube differential pressure and simultaneously obtains real-time voltage and current values ​​through a dual-range sampling strategy. The bus differential pressure closed-loop execution module is used to respond to voltage regulation commands and dynamically adjust the effective value of the AC voltage input to the primary side of the power frequency transformer. The output closed-loop control module uses a dual-range DAC synthesis strategy to generate a high-precision target given signal. Based on the error between the real-time voltage value or real-time current value and the target given signal, a drive signal is generated to adjust the conduction state of the power regulation tube.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the step of dynamic adjustment of the bus differential voltage of the dual-range DC high-voltage power supply as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the step of dynamically adjusting the differential voltage of the dual-range DC high-voltage power supply bus as described in any one of claims 1 to 7.

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