Dual-range direct-current high-voltage power supply bus voltage difference dynamic regulation method, device and medium

Abstract

The present application relates to a kind of double range DC high voltage power supply bus voltage difference dynamic regulation method, device and medium, wherein, method includes setting output target and the safe tube voltage difference range of power regulation pipe;Synchronous sampling real-time tube voltage difference, and using double range strategy sampling output voltage and current;Through the first closed loop dynamic regulation input voltage of preceding stage commercial power, make real-time tube voltage difference maintain in safe range, ensure that power tube withstand voltage safety;Through the second closed loop based on the high-precision given signal of double range DAC synthesis and the error of sampled feedback, generate control signal linear regulation power tube, realize the high-precision constant voltage or constant current control of output;Through double range acquisition and control, precision is promoted, utilize bus voltage difference dynamic regulation breakthrough power tube withstand voltage limit, realized high voltage, low ripple, full linear, high safety DC power output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power supply regulation, in particular 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, etc. due to its low output ripple, small noise, good dynamic response and other advantages. The traditional linear high-voltage power supply technical scheme adopts the architecture 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 characteristics of the output; the 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 extremely high voltage resistance, resulting in a dramatic increase in cost, but also works in a high-voltage difference state, with extremely low efficiency, serious heating, and challenges to system reliability; the high voltage is obtained by the way of series superposition of multiple low-voltage outputs, which has 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 that 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 super-high voltage power tubes while maintaining high precision and low ripple characteristics is a technical problem that needs 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 power tube voltage resistance limit by using bus voltage difference dynamic regulation, 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:

[0006] Set the target voltage value or target current value of the DC high-voltage output, and pre-set the safe tube voltage difference range of the power regulating tube;

[0007] 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 value and real-time current value of the DC high-voltage output through a dual-range sampling strategy;

[0008] Compare the real-time tube voltage difference with the safe tube voltage difference range, and dynamically adjust the front-stage mains AC input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range;

[0009] 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 for adjusting the on-state of the power regulating tube.

[0010] 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:

[0011] According to the user instruction or preset program, the target voltage value or target current value of the DC high voltage output is set;

[0012] 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.

[0013] 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:

[0014] 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;

[0015] The first proportional voltage signal and the second proportional voltage signal are synchronously sampled and converted by using independent analog-to-digital conversion channels, respectively;

[0016] 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.

[0017] 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:

[0018] 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;

[0019] 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;

[0020] 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, so as to maintain the real-time tube voltage difference within the safe tube voltage difference range.

[0021] Further, the step of generating a target given signal by using a dual-range DAC synthesis strategy comprises:

[0022] 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;

[0023] 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;

[0024] weighting and synthesizing the first given signal and the second given signal, and calibrating to a voltage range suitable for a feedback signal to obtain a total target given signal;

[0025] 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.

[0026] 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 regulating tube comprises:

[0027] performing proportional-integral-derivative operation on the error signal to generate an analog error amplification signal;

[0028] comparing the analog error amplification signal with a preset amplitude limiting threshold value:

[0029] when the error amplification signal exceeds the amplitude limiting threshold value, outputting a constant saturated drive signal;

[0030] 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;

[0031] 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 regulating tube to perform linear regulation, and drive the DC high voltage output to be dynamically stable at the target voltage value or target current value.

[0032] Further, the step of driving the conduction resistance between the gate and the drain-source of the power regulating tube to perform linear regulation comprises:

[0033] The power regulating tube is controlled to always work in a linear amplification region, and the linear variation of the gate voltage of the power regulating tube and the on-resistance between the drain and the source is continuously and smoothly adjusted by the control signal, so that the continuous linear regulation of the DC high-voltage output voltage or current is realized.

[0034] In the process of the continuous linear regulation, the front stage of the power supply is boosted by a power frequency transformer, rectified by a rectification and filter unit, and linearly amplified by the power regulating tube, so that the full linear DC high-voltage output is obtained.

[0035] The application further provides a double-range DC high-voltage power supply bus voltage difference dynamic regulation device, which comprises:

[0036] A parameter setting and main control module is configured to set a target voltage value or a target current value of the DC high-voltage output and a safe tube voltage difference range of the power regulating tube.

[0037] 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 by a double-range sampling strategy.

[0038] A bus voltage difference closed-loop execution module is configured to dynamically regulate the effective value of the alternating current input to the primary side of the power frequency transformer in response to a voltage regulation instruction.

[0039] An output closed-loop control module is configured to generate a high-precision target given signal by using a double-range DAC synthesis strategy, generate a driving signal to regulate the on state of the power regulating tube based on the error between the real-time voltage value or the real-time current value and the target given signal.

[0040] The application further provides a computer device comprising a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the double-range DC high-voltage power supply bus voltage difference dynamic regulation of any one of the above-mentioned applications when executing the computer program.

[0041] The application further provides a computer readable storage medium, which stores a computer program, and the computer program realizes the steps of the double-range DC high-voltage power supply bus voltage difference dynamic regulation of any one of the above-mentioned applications when executed by a processor. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 FIG. 1 is a linear high-voltage DC source overall system architecture diagram in an embodiment of the application;

[0043] Figure 2 FIG. 3 is a power MOS tube regulating unit and constant voltage control associated circuit schematic diagram in an embodiment of the application;

[0044] Figure 3 FIG. 5 is a power MOS tube gate control and ADC linkage circuit schematic diagram in an embodiment of the application;

[0045] Figure 4 is a rectifier filter unit circuit schematic diagram of an embodiment of the present application;

[0046] Figure 5 is an output filter unit circuit schematic diagram of an embodiment of the present application;

[0047] Figure 6 is a bus sampling control unit two-way acquisition circuit schematic diagram of an embodiment of the present application;

[0048] Figure 7 is a mains voltage regulation unit circuit schematic diagram of an embodiment of the present application;

[0049] Figure 8 is a flow chart of a dual-range DC high-voltage power supply bus voltage difference dynamic regulation method of an embodiment of the present application;

[0050] Figure 9 is a structure block diagram of a dual-range DC high-voltage power supply bus voltage difference dynamic regulation device of an embodiment of the present application;

[0051] The implementation of the object, functional features and advantages of the present application will be further described with reference to the accompanying drawings and embodiments. DETAILED DESCRIPTION

[0052] In order to make the object, technical solutions and advantages of the present application clearer, the present application 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 only used to explain the present application and do not limit the present application.

[0053] Referring to Figure 8 is a flow chart of a dual-range DC high-voltage power supply bus voltage difference dynamic regulation method of an embodiment of the present application, comprising the following steps:

[0054] S1, setting the target voltage value or target current value of the DC high-voltage output, and pre-setting the safe tube voltage difference range of the power regulation tube;

[0055] S2, sampling the input bus voltage and output voltage of the power regulation tube to obtain the real-time tube voltage difference, and simultaneously sampling the real-time voltage value and real-time current value of the DC high-voltage output through a dual-range sampling strategy;

[0056] S3, comparing the real-time tube voltage difference with the safe tube voltage difference range, and dynamically adjusting the front-stage mains AC input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range;

[0057] S4, generating a target given signal by using a dual-range DAC synthesis strategy, and generating a control signal by performing error processing, wherein the control signal is used to adjust the conduction state of the power regulation tube.

[0058] 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.

[0059] 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 1 The 154 ADC acquisition unit has two independent analog-to-digital conversion channels that synchronously acquire the 10% low-range signal and 90% high-range signal of the DC high voltage output, respectively. The sampling clock is strictly synchronized to ensure data timing consistency. After acquisition, the data is calibrated and synthesized based on a preset proportional coefficient to obtain high-precision real-time voltage and current values. This solves the problems of insufficient accuracy of traditional single-range sampling, large interference in differential pressure sampling under high-voltage scenarios, and asynchronous voltage and current sampling, providing safe status data for dynamic adjustment of bus differential pressure.

[0060] As described in step S3 above, the main control unit receives the real-time tube differential pressure data collected in step S2 and performs a difference calculation with the preset safety range: when the real-time differential pressure exceeds the upper limit, a voltage reduction command is generated; when it is below the lower limit, a voltage increase command is generated; and when it is within the range, the current command is maintained. The command is transmitted to the mains voltage regulation unit via isolation control, and dynamically changes the conduction angle of the core device DT1 thyristor or silicon controlled rectifier. Figure 1The effective value of the AC voltage of the primary side of the power frequency transformer 143 is rectified by the transformer and a rectifier filter unit, and the input bus voltage of the MOS tube is adjusted synchronously. During the adjustment process, the 3-stage preset pressure difference reference voltage value is automatically switched, and the bus voltage is pulled up by default by the resistance R28, which ensures that the power board and the AC voltage adjustment board still maintain low voltage safety output when they are disconnected. This method solves the problem of insufficient MOS tube voltage resistance and excessive power consumption caused by the traditional fixed bus voltage, achieving the dual goals of safe operation and low power consumption of the MOS tube.

[0061] As described in step S4 above, the dual-range cooperative mechanism is started by the DAC synthesis unit, and a low-weight signal corresponding to a target value of 10% and a high-weight signal corresponding to a target value of 90% are generated by two independent digital-to-analog converters. After being weighted and synthesized and calibrated to the range that is adapted to the feedback signal, a high-resolution target given signal is obtained. Then, the signal is subjected to difference operation with the real-time voltage and current feedback signals collected in S2, and a proportional-integral-derivative (PID) operation amplification is performed on the error signal to generate an analog error amplification signal. According to the comparison result of the error amplitude and the preset amplitude threshold, a saturation drive signal is dynamically output when the error exceeds the threshold, and a pulse width modulation signal is dynamically output when the error is within the threshold, which is used 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 achieved, solving the problems of insufficient control precision and large output ripple in traditional single-range control, and finally realizing high-precision, low-ripple, and full-linear high-voltage output beyond the rated voltage resistance of the MOS tube.

[0062] In one embodiment, the step S1 of setting the target voltage value or target current value of the direct-current high-voltage output and presetting the safe tube pressure difference range of the power regulation tube includes:

[0063] S11, receiving and confirming the output target value input by the user through the human-machine interface or specified by the preset program;

[0064] S12, querying or calculating the corresponding safe tube pressure difference reference value according to the output target value;

[0065] S13, determining and loading the safe tube pressure difference range for closed-loop control based on the safe tube pressure difference reference value and a preset safety coefficient.

[0066] In the specific implementation process, the main control unit and the control screen in Figure 1 cooperate to perform. The user inputs the target voltage value or target current value through the human-machine interaction interface of the control screen, and the value is transmitted to the main control unit through the Figure 1The 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.

[0067] 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:

[0068] S21, Dual-path isolated acquisition of bus differential pressure;

[0069] S22, dual-range synchronous sampling output voltage and current;

[0070] S23, calibrate and synthesize the sampled data.

[0071] In the specific implementation process, step S2 is achieved through... Figure 1 The bus sampling control unit and the ADC acquisition unit work together, and the entire sampling link uses an isolated communication design to block high-voltage interference. The bus sampling control unit operates according to dual-channel acquisition logic. Its first differential sampling circuit obtains the total input bus voltage output from the rectifier and filter unit, i.e. Figure 6 The HV+ terminal; its second resistor voltage divider network collects the voltage of this bus and Figure 5The potential difference between the HVO+ end of the output capacitor filter unit and Q1's drain-source real-time tube voltage difference is outputted, and the two analog signals are sent to the main control unit after being processed by the isolation amplifier. Meanwhile, the ADC acquisition unit executes a double-range sampling strategy: for the output voltage, one analog-digital conversion channel acquires the low-range signal accounting for about 10% of the output voltage after resistance division, and the other channel synchronously acquires the high-range signal accounting for about 90%. The two channels are triggered by the same timer of the main control unit to realize synchronous sampling clock. Figure 1 The voltage drop across the sampling resistor RT2 in the current-limiting control unit is outputted, and after the main control unit receives the signal, based on the pre-calibrated high and low range division ratio coefficients, the two voltage sampling data are digitally calibrated and weighted to obtain a high-precision real-time voltage value. The real-time tube voltage difference, the synthesized real-time voltage value and the real-time current value are stored in the buffer area of the main control unit at an update rate of 1 kHz to form a real-time data set for the pressure difference comparison in step S3 and the error calculation in step S4.

[0072] 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 alternating current input voltage according to the comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range comprises:

[0073] S31, comparing the real-time tube voltage difference with the safe tube voltage difference range;

[0074] S32, generating a voltage regulation instruction according to the comparison result;

[0075] S33, executing front-stage alternating voltage regulation.

[0076] In the specific implementation process, the step S3 is cooperatively executed by the control logic module bus sampling control unit, the main control unit and the commercial voltage regulation unit in the front stage to dynamically stabilize the power tube voltage difference by regulating the front-stage alternating current input. The main control unit reads the real-time tube voltage difference data provided by the step S2, i.e. Figure 4 The difference between the high voltage HV+ outputted by the rectifier filter unit and Figure 5 The voltage HVO+ outputted by the output filter unit, and compares it with the loaded safe tube voltage difference range in real time. The comparison logic is: if the real-time tube voltage difference is higher than the upper limit of the range, a "voltage reduction" instruction is generated; if it is lower than the lower limit, a "voltage increase" instruction is generated; if it is within the range, the current instruction is maintained. The main control unit generates a digital voltage regulation instruction according to the comparison result, which is sent to the commercial voltage regulation unit through isolation communication, as shown in Figure 7 After receiving the instruction, the unit generates a trigger pulse synchronized with the commercial zero-crossing point and with variable phase from its internal circuit, such as U1, U2 and their peripheral resistance network, to drive Figure 7The 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 shown (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.

[0077] 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:

[0078] S41, dual-range DAC synthesizes the target given signal;

[0079] S42, collects real-time feedback signals;

[0080] S43, perform error calculation and processing;

[0081] S44 generates a power regulation command;

[0082] S45 drives the power regulating tube to perform linear regulation.

[0083] 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 3 The weighted summation circuit, composed of precision operational amplifiers within the 150 constant current control unit, performs the superposition; its principle can be found in [reference needed]. Figure 2 or Figure 3The operational amplifier configuration in the system is synthesized and calibrated to a voltage range adapted to the feedback signal, ultimately generating a high-resolution, high-linear total target setpoint signal V_ref. This signal is fed into the non-inverting inputs of the error amplifiers in the constant voltage control unit and the constant current control unit, respectively. Simultaneously, the main control unit receives high-precision real-time voltage and current values, calibrated and synthesized in step S2, from the ADC acquisition unit as system feedback. The system selects the appropriate feedback path for error processing based on the operating mode: in constant voltage mode, the real-time voltage value is sent to the constant voltage control unit, where the error amplifier compares the feedback voltage with V_ref and performs proportional-integral-derivative (PID) calculations, outputting an error voltage V_error_V. The circuit structure can be found in [reference needed]. Figure 3 The differential amplifier and integrator network consists of operational amplifiers and resistors. In constant current mode, through... Figure 1 In the current limiting control unit 149, the voltage drop across the sampling resistor RT2 is converted into a real-time current value, which is then sent to the constant current control unit. The error amplifier in this unit compares the current feedback signal with V_ref and performs PID calculations, outputting an error voltage V_error_I. The generated error voltage V_error_V or V_error_I is then sent to the gate drive circuit of the power regulation unit, corresponding to the gate drive... Figure 2 , Figure 3 The supporting circuit for the module includes an optocoupler isolation module, a transistor buffer stage, and a level shifting circuit. The optocoupler isolates the control section from the high-voltage section, preventing high-voltage interference from damaging the control circuit. After receiving the error voltage, the circuit determines its operation based on a preset limiting threshold: if the error exceeds the threshold, it outputs a saturated drive level; otherwise, it outputs a linearly adjusted drive signal. This ultimately generates a voltage signal V_gs that directly drives the gate of Q1. The V_gs signal controls Q1, ensuring it always operates in the linear amplification region and linearly adjusts its drain-source on-resistance. This adjustment directly changes the gate's voltage. Figure 5 The voltage HVO+ across the output filter unit, composed of capacitors, resistors, and diodes connected in series and parallel, is filtered to remove ripple, ensuring that the final DC high-voltage output converges quickly and smoothly to the set target value. During the adjustment process, the main control unit receives real-time source-drain voltage difference data of the MOSFETs from the bus sampling control unit to prevent the MOSFET voltage difference from exceeding the safe range; if Figure 1 The 159 protection control unit detects overvoltage and overcurrent signals and immediately cuts off the gate drive signal to ensure system hardware safety.

[0084] Reference Figure 9 The above is a schematic block diagram of a dual-range DC high-voltage power supply bus differential voltage dynamic adjustment device according to an embodiment of the present invention, comprising:

[0085] The parameter setting and master control module is used for setting a target voltage value or a target current value of the DC high voltage output and a safe tube voltage difference range of the power regulating tube.

[0086] The sampling module is used for acquiring a real-time tube voltage difference and synchronously acquiring a real-time voltage value and a real-time current value through a double-range sampling strategy.

[0087] The bus voltage difference closed-loop execution module is used for dynamically adjusting an effective value of an alternating current voltage input to the primary side of the power frequency transformer in response to the voltage regulating instruction.

[0088] The output closed-loop control module generates a high-precision target given signal through a double-range DAC synthesis strategy, generates a driving signal to adjust the 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.

[0089] In summary, the application sets an output target value by the master control unit and the control screen, dynamically calculates a safe tube voltage difference range in combination with MOS tube parameters, and builds a safe reference through hardware redundancy design; then, the bus sampling control unit collects MOS tube voltage differences in two ways, 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 thyristor is driven to adjust the primary side voltage of the power frequency transformer, and multiple reference switches are linked to stabilize the MOS tube voltage difference in a safe low-power consumption range; finally, the DAC double-range synthesis target signal is generated, a control signal is generated through PID operation, the MOS tube is driven to work in a linear region, and the output filter unit is optimized to optimize the output characteristics. The application takes double-closed-loop cooperation, isolation design and double-range strategy as the core, breaks through the voltage resistance limit of the 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 the traditional scheme, and takes into account safety and accuracy.

[0090] An embodiment of the application further provides a computer readable storage medium, which has a computer program stored thereon, and the computer program is executed by a processor to realize the method.

[0091] 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.

[0092] 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.

[0093] 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 regulation of the voltage difference of a double range DC high voltage power supply bus, characterized in that The method comprises the following steps: setting a target voltage value or a target current value of a direct current high voltage output, and presetting a safe tube voltage difference range of a power regulation tube; sampling input bus voltage and output voltage of the power regulation tube to obtain a real-time tube voltage difference, and synchronously sampling a real-time voltage value and a real-time current value of the direct current high voltage output by a double-range sampling strategy; comparing the real-time tube voltage difference with the safe tube voltage difference range, and dynamically adjusting a front-stage commercial power alternating current input voltage according to a comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range; generating a target given signal by a double-range DAC synthesis strategy, and generating a control signal by error processing, the control signal being used to adjust a conduction state of the power regulation tube; dividing a voltage output of the direct current high voltage to obtain a first proportional voltage signal and a second proportional voltage signal, wherein the first proportional voltage signal corresponds to a low-range part of the direct current high voltage output, and the second proportional voltage signal corresponds to a high-range part of the direct current high voltage output; synchronously sampling and converting the first proportional voltage signal and the second proportional voltage signal by independent analog-digital conversion channels; synthesizing the converted low-range voltage signal and the high-range voltage signal after calibration based on a preset proportional coefficient to obtain a real-time voltage value; generating a first given signal by a first digital-analog converter, the first given signal corresponding to a low-weight part of the target voltage value or the target current value; generating a second given signal by a second digital-analog converter, the second given signal corresponding to a high-weight part of the target voltage value or the target current value; weighting and synthesizing the first given signal and the second given signal, and calibrating to a voltage range suitable for 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 the real-time current value to obtain an error signal.

2. The dual range DC high voltage power supply bus voltage difference dynamic regulation method according to claim 1, characterized in that, The step of setting a target voltage value or a target current value of a direct current high voltage output, and presetting a safe tube voltage difference range of a power regulation tube comprises: setting the target voltage value or the target current value of the direct current high voltage output according to a user instruction or a preset program; dynamically calculating and setting the safe tube voltage difference range according to device parameters of the power regulation tube, wherein an upper limit value of the safe tube voltage difference range is less than a maximum rated withstand voltage value of the power regulation tube, and the upper limit value is set to dynamically decrease with an increase of an output target value.

3. The dual range DC high voltage power supply bus voltage difference dynamic regulation method 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 a front-stage commercial power alternating current input voltage according to a comparison result to maintain the real-time tube voltage difference within the safe tube voltage difference range comprises: generating a voltage regulation instruction according to a comparison result of the real-time tube voltage difference and the safe tube voltage difference range; adjusting a conduction angle in an adjustable circuit arranged between a commercial power input and a power frequency transformer based on the voltage regulation instruction, and dynamically changing an effective value of an alternating current voltage of a primary side of the power frequency transformer by adjusting the conduction angle. By changing the effective value of the primary side AC voltage, the rectified and filtered input bus voltage of the power regulating tube is correspondingly increased or decreased, and the real-time tube voltage difference is maintained within the safe tube voltage difference range.

4. The dual range DC high voltage power supply bus voltage difference dynamic regulation method according to claim 1, characterized in that, The step of generating a control signal for regulating the conduction state of the power regulating tube by performing error processing includes: 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; outputting a constant saturated drive signal when the error amplification signal exceeds the amplitude limiting threshold value; converting the error amplification signal into a corresponding pulse width modulation signal when the error amplification signal does not exceed the amplitude limiting threshold value; using the saturated drive signal or the pulse width modulation signal as the control signal to linearly regulate the conduction resistance between the gate and the drain-source of the power regulating tube, and to dynamically stabilize the DC high voltage output at the target voltage value or the target current value.

5. The dual range DC high voltage power supply bus voltage difference dynamic regulation method according to claim 4, characterized in that, The step of linearly regulating the conduction resistance between the gate and the drain-source of the power regulating tube includes: controlling the power regulating 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 regulating tube through the control signal, and continuously linearly regulating the DC high voltage output voltage or current; In the process of continuous linear regulation, the front stage of the power supply obtains full linear DC high voltage output through the functions of the power frequency transformer, the rectification and filtering unit, and the linear amplification of the power regulating tube.

6. A dual range DC high voltage power supply bus voltage difference dynamic regulating device, characterized in that, It includes: a parameter setting and main control module for setting the target voltage value or the target current value of the DC high voltage output and the safe tube voltage difference range of the power regulating tube; a sampling module for synchronously obtaining the real-time voltage value and the real-time current value through a double-range sampling strategy; a bus voltage difference closed-loop execution module for dynamically adjusting the effective value of the AC voltage input to the primary side of the power frequency transformer in response to a voltage regulating instruction; an output closed-loop control module for generating a high-precision target given signal using a double-range DAC synthesis strategy, and generating a drive signal to regulate the conduction state of the power regulating tube based on the error between the real-time voltage value or the real-time current value and the target given signal; dividing the voltage output of the DC high voltage 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; synchronously sampling and converting the first proportional voltage signal and the second proportional voltage signal through independent analog-to-digital conversion channels; synthesizing the converted low-range voltage signal and the high-range voltage signal after calibration based on a preset proportional coefficient to obtain a real-time voltage value; generating a first given signal through a first digital-to-analog converter, wherein the first given signal corresponds to the low-weight part of the target voltage value or the 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. 7.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-6 when the computer program is executed by the processor. The processor executes the computer program to realize the steps of the dual-range DC high-voltage power supply bus voltage difference dynamic adjustment in any one of claims 1 to 5.

8. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to realize the steps of the dual-range DC high-voltage power supply bus voltage difference dynamic adjustment in any one of claims 1 to 5.

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