High-voltage power supply, voltage control method, and readable storage medium

Abstract

The application relates to a high-voltage power supply, a voltage control method and a readable storage medium. The high-voltage power supply comprises a voltage output device, the voltage output device comprising a three-phase power supply end, a rectifier bridge, a first thin-film capacitor with a capacitance value less than a preset capacitance value threshold, and a high-voltage transformer; the rectifier bridge is used for converting alternating voltage output by the three-phase power supply end into a first direct-current voltage; the first thin-film capacitor is used for filtering the first direct-current voltage to obtain a second direct-current voltage; and the high-voltage transformer is used for boosting the second direct-current voltage to obtain an output voltage. The application adopts the first thin-film capacitor with the capacitance value less than the preset capacitance value threshold, can greatly improve the conduction angle of the rectifier bridge, reduce the peak value of the three-phase power supply end network current, and further improve the power factor of the three-phase power supply end, thereby significantly reducing the capacity requirement of the three-phase power supply end; moreover, the first thin-film capacitor has a small volume and a long service life, and the power density and the service life of the high-voltage power supply are improved.

Description

Technical Field

[0001] This application relates to the field of electronic circuit technology, and in particular to a high-voltage power supply, a voltage control method, and a readable storage medium. Background Technology

[0002] A high-voltage power supply is a power device that converts low voltage into high voltage output. It is widely used in scientific research, industrial manufacturing, medical equipment and many other fields. A high-voltage power supply includes a three-phase mains power supply terminal, a rectifier bridge, large-capacity electrolytic capacitors and a high-voltage transformer.

[0003] Currently, the AC voltage output from the three-phase power grid is rectified by a rectifier bridge and filtered by an electrolytic capacitor to obtain a DC voltage with certain fluctuations, which is then converted into high-voltage DC power by a high-voltage transformer.

[0004] However, when existing high-voltage power supplies are used in high-power applications, a large number of high-capacity electrolytic capacitors are required in combination with a rectifier bridge to rectify and filter the AC voltage output from the three-phase power grid to obtain DC power. However, the large number of high-capacity electrolytic capacitors results in a low power factor at the three-phase power grid supply end. Summary of the Invention

[0005] Based on this, it is necessary to provide a high-voltage power supply, voltage control method, and readable storage medium that can improve the peak current at the power supply end of a three-phase power grid, thereby improving the power factor, in order to address the aforementioned technical problems.

[0006] In a first aspect, this application provides a high-voltage power supply, the high-voltage power supply including a voltage output device, the voltage output device including a three-phase power grid supply terminal, a rectifier bridge, a first film capacitor with a capacitance value less than a preset capacitance value threshold and a high-voltage transformer, the first film capacitor being connected in parallel to the DC bus of the rectifier bridge output and the high-voltage transformer input;

[0007] The rectifier bridge is used to convert the AC voltage output from the three-phase power grid supply terminal into a first DC voltage.

[0008] The first thin-film capacitor is used to filter the first DC voltage to obtain the second DC voltage;

[0009] The high-voltage transformer is used to boost the second DC voltage to obtain the output voltage.

[0010] In one embodiment, the high-voltage power supply further includes an active damping generator and a controller;

[0011] The active damping generation device is used to generate a virtual damping signal and input the virtual damping signal to the controller;

[0012] The controller is used to generate a drive signal based on the virtual damping signal; the drive signal is used to suppress the oscillation of the bus voltage in the high-voltage power supply.

[0013] In one embodiment, the active damping generation device includes a filter, a damper, and an adder;

[0014] The filter is used to acquire a first electrical signal, filter out the DC component and harmonic component in the first electrical signal to obtain a second electrical signal, and input the second electrical signal to the damper; the first electrical signal includes any one of the bus voltage, rectifier bridge current and capacitor current in the high voltage power supply;

[0015] The damper is used to process the second electrical signal to obtain a virtual damping signal, and the virtual damping signal is input to the controller through the adder.

[0016] In one embodiment, the controller includes a voltage loop, the voltage loop including a first error comparator and a regulator, and the adder is disposed between the first error comparator and the regulator.

[0017] In one embodiment, the computational processing includes at least one of scaling, differentiation, and integration.

[0018] In one embodiment, the controller includes a voltage loop and a current loop, the voltage loop including a limiting circuit, the current loop including a second error comparator, and the adder disposed between the limiting circuit and the second error comparator.

[0019] In one embodiment, the high-voltage power supply further includes a passive damping device, the first end of which is connected to the first end of the first thin-film capacitor, and the second end of which is connected to the second end of the first thin-film capacitor.

[0020] In one embodiment, the passive damping device includes a second thin-film capacitor with a capacitance value less than the preset capacitance threshold and a damping resistor with a resistance value less than the preset resistance threshold; a first terminal of the second thin-film capacitor is connected to a first terminal of the first thin-film capacitor, a second terminal of the second thin-film capacitor is connected to a first terminal of the damping resistor, and a second terminal of the damping resistor is connected to a second terminal of the first thin-film capacitor.

[0021] Secondly, this application also provides a voltage control method, wherein the controller is used to control the voltage output device as described in any of the first aspects.

[0022] Thirdly, this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the method steps provided in the second aspect.

[0023] Fourthly, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the method steps provided in the second aspect.

[0024] The aforementioned high-voltage power supply, voltage control method, and readable storage medium include a voltage output device comprising a three-phase grid power supply terminal, a rectifier bridge, a first film capacitor with a capacitance value less than a preset threshold value, and a high-voltage transformer. The first film capacitor is connected in parallel on the DC bus of the rectifier bridge output and the high-voltage transformer input. The rectifier bridge converts the AC voltage output from the three-phase grid power supply terminal into a first DC voltage. The first film capacitor filters the first DC voltage to obtain a second DC voltage. The high-voltage transformer boosts the second DC voltage to obtain the output voltage. In this embodiment, the rectifier capacitor uses a first film capacitor with a capacitance value less than a preset threshold value, which can significantly increase the conduction angle of the rectifier bridge, reduce the peak value of the grid current at the three-phase grid power supply terminal, thereby improving the power factor of the three-phase grid power supply terminal and significantly reducing the capacity requirements of the three-phase grid power supply terminal. Moreover, the first film capacitor is small in size and has a long lifespan, which can improve the power density and lifespan of the high-voltage power supply. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments of this application or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the first waveform of the electrical signal in a high-voltage power supply in one embodiment;

[0027] Figure 2 This is a first schematic diagram of a high-voltage power supply in one embodiment;

[0028] Figure 3 This is a schematic diagram of the second waveform of the electrical signal in a high-voltage power supply in one embodiment;

[0029] Figure 4 This is a second schematic diagram of a high-voltage power supply in one embodiment;

[0030] Figure 5 This is a schematic diagram of the third waveform of the electrical signal in a high-voltage power supply in one embodiment;

[0031] Figure 6 This is a schematic diagram of the equivalent circuit of a high-voltage power supply in one embodiment;

[0032] Figure 7 This is a third schematic diagram of a high-voltage power supply in one embodiment;

[0033] Figure 8 This is a fourth schematic diagram of a high-voltage power supply in one embodiment;

[0034] Figure 9 This is a fifth schematic diagram of a high-voltage power supply in one embodiment;

[0035] Figure 10 This is a schematic diagram of the fourth waveform of the electrical signal in a high-voltage power supply in one embodiment;

[0036] Figure 11 This is a schematic diagram of the fifth waveform of the electrical signal in a high-voltage power supply in one embodiment;

[0037] Figure 12 This is a sixth schematic diagram of a high-voltage power supply in one embodiment;

[0038] Figure 13 This is a seventh schematic diagram of a high-voltage power supply in one embodiment;

[0039] Figure 14 This is an eighth schematic diagram of a high-voltage power supply in one embodiment;

[0040] Figure 15 This is a ninth schematic diagram of a high-voltage power supply in one embodiment;

[0041] Figure 16 This is a tenth schematic diagram of a high-voltage power supply in one embodiment.

[0042] Explanation of reference numerals in the attached figures:

[0043] 1. Voltage output device; 11. Three-phase power grid supply terminal; 12. Rectifier bridge;

[0044] C bus1 1. First-film capacitor; 13. High-voltage transformer;

[0045] 2. Active damping generator; 3. Controller;

[0046] 21. Filter; 22. Damper; 23. Adder;

[0047] 31. Voltage loop; 32. Current loop; 311. First error comparator;

[0048] 312. First regulator; 313. First limiting circuit; 321. Second error comparator;

[0049] 322. Second regulator; 323. Second limiting circuit; 33. Modulation circuit;

[0050] C bus2 Second thin-film capacitor; Rd, damping resistor. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0053] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0054] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0055] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0056] Existing high-voltage power supplies, in high-power applications, require the use of numerous large-capacity electrolytic capacitors. While this can reduce bus voltage fluctuations and thus output voltage ripple to some extent, the large number of these capacitors results in extremely high peak currents at the three-phase power grid supply terminals, leading to a low power factor and demanding high capacitance requirements at the three-phase power grid supply terminals. Furthermore, these large-capacity electrolytic capacitors are bulky and have limited lifespans, severely restricting the size and reliability of high-voltage power supplies. For example, consider an electrolytic capacitor with C=4000uF... Figure 1 As shown, its input power factor is only 0.7, the power supply capacity required for a 50kW output is greater than 70kVA, and the peak current at the three-phase power grid supply end is as high as 320A. To solve the above problems, embodiments of this application provide a high-voltage power supply, a voltage control method, and a readable storage medium.

[0057] Figure 2 This is a first schematic diagram of a high-voltage power supply in one embodiment. The high-voltage power supply includes a voltage output device 1, which includes a three-phase mains power supply terminal 11, a rectifier bridge 12, and a first thin-film capacitor C with a capacitance value less than a preset capacitance threshold. bus1 And high-voltage transformer 13, first film capacitor C bus1 The rectifier bridge 12 is connected in parallel to the DC bus of the output of the rectifier bridge 12 and the input of the high-voltage transformer 13; the rectifier bridge 12 is used to convert the AC voltage output from the three-phase power grid supply terminal 11 into a first DC voltage; the first film capacitor C bus1 The first DC voltage is filtered to obtain the second DC voltage; the high-voltage transformer 13 is used to boost the second DC voltage to obtain the output voltage.

[0058] In the embodiments of this application, such as Figure 2 As shown, the AC voltage output from the three-phase power grid supply terminal 11 is converted into a first DC voltage, and the first DC voltage is input to the first thin-film capacitor C. bus1 The first thin-film capacitor C bus1 The first DC voltage is filtered to obtain the second DC voltage. The high-voltage transformer 13 is connected to the first film capacitor C. bus1 The output second DC voltage is boosted to obtain the output voltage V.o .

[0059] When filtering with traditional large-capacity electrolytic capacitors, the electrolytic capacitors only charge near the peak value of the AC voltage output from the three-phase power grid supply terminal 11, resulting in an extremely narrow conduction angle (approximately 30°~60°) for the rectifier bridge 12. Consequently, the grid current IgA at the three-phase power grid supply terminal 11 exhibits a high-amplitude spike pulse. This application embodiment provides a first thin-film capacitor C with a capacitance value less than a preset capacitance threshold. bus1 Due to the first thin-film capacitor C bus1 The capacitance value is less than the preset capacitance threshold, and the first thin-film capacitor C bus1 Energy storage decreases, output voltage V o The increased fluctuations force the rectifier bridge 12 to turn on earlier and turn off later in each half-cycle, which can significantly expand the conduction angle (up to 120°~150°).

[0060] Furthermore, with the conduction angle increased, the pulse width of the grid current iga under the same load power increases. According to the energy conservation formula, the amplitude of the grid current iga will inevitably decrease, and the current waveform of the grid current iga will tend to be continuous. After the waveform of the grid current iga is improved, the harmonic content decreases, the proportion of the fundamental component increases, and the displacement factor approaches 1, which can significantly improve the power factor and reduce the capacity requirement of the three-phase power supply terminal 11. Figure 3 As shown, the first thin-film capacitor C bus1 When the capacitor is reduced to 40uF, its input power factor can reach 0.95, the power supply capacity required for 50kW output is only 52.5kVA, and the peak value of the grid current iga at the three-phase grid power supply terminal 11 is only 110A, which is significantly lower than the peak value of the grid current iga when the electrolytic capacitor C=4000uF.

[0061] Due to the first thin-film capacitor C in this application bus1 The capacitance value is less than the preset capacitance threshold, and the first thin-film capacitor C bus1 Its volume is relatively small. Furthermore, the first thin-film capacitor C bus1 They typically offer better high-frequency performance and a longer lifespan.

[0062] Optionally, the preset capacitance threshold can be 10μF, 10μF, etc.

[0063] Optionally, the three-phase power supply terminal 11 includes an inductor Lg.

[0064] In this embodiment, the high-voltage power supply includes a voltage output device, which comprises a three-phase grid power supply terminal, a rectifier bridge, a first film capacitor with a capacitance value less than a preset threshold value, and a high-voltage transformer. The first film capacitor is connected in parallel on the DC bus of the rectifier bridge output and the high-voltage transformer input. The rectifier bridge converts the AC voltage output from the three-phase grid power supply terminal into a first DC voltage. The first film capacitor filters the first DC voltage to obtain a second DC voltage. The high-voltage transformer boosts the second DC voltage to obtain the output voltage. In this embodiment, the rectifier capacitor uses a first film capacitor with a capacitance value less than a preset threshold value, which can significantly increase the conduction angle of the rectifier bridge, reduce the peak value of the grid current at the three-phase grid power supply terminal, thereby improving the power factor of the three-phase grid power supply terminal and significantly reducing the capacity requirements of the three-phase grid power supply terminal. Moreover, the first film capacitor is small in size and has a long lifespan; using the first film capacitor can improve the power density and lifespan of the high-voltage power supply.

[0065] Figure 4 This is a second schematic diagram of a high-voltage power supply in one embodiment, as shown below. Figure 4 As shown, the high-voltage power supply also includes an active damping generation device 2 and a controller 3; the active damping generation device 2 is used to generate a virtual damping signal and input the virtual damping signal to the controller 3; the controller 3 is used to generate a drive signal based on the virtual damping signal; the drive signal is used to suppress the oscillation of the bus voltage in the voltage output device 1.

[0066] like Figure 5 As shown, based on the first thin-film capacitor C bus1 While high-voltage power supplies can significantly improve power factor, power density, and lifespan, when the impedance of the three-phase power grid supply terminal 11 is high, the bus voltage V in the voltage output device 1 will be affected. bus Oscillations may occur, leading to system instability. The reasons are as follows: Figure 6 As shown: The inductor Lg in the three-phase power supply terminal 11 and the first thin-film capacitor C on the bus side bus1 This forms an LC resonant network. The subsequent high-voltage transformer 13 is a constant power load, which can be equivalent to a negative impedance R. LL The circuit of voltage output device 1 is essentially undamped, making it prone to unstable oscillations when the inductor Lg or the load power is high. To address this issue, embodiments of this application utilize a first thin-film capacitor C... bus1 Based on this, a virtual damping signal is generated by the active damping generator 2, and the virtual damping signal is sent to the controller 3 for use as active damping to suppress the bus voltage V caused by the large impedance of the three-phase power supply terminal 11 or the large power of the load. bus oscillation.

[0067] Optionally, the active damping generating device 2 includes a sensor, a filter 21, a damper 22, and an adder 23. The active damping generating device 2 may also include a sensor, a damper 22, and an adder 23.

[0068] Furthermore, such as Figure 7 As shown, Figure 7 In one embodiment, a third schematic diagram of a high-voltage power supply is provided. The active damping generation device 2 includes a filter 21, a damper 22, and an adder 23. The filter 21 is used to acquire a first electrical signal, filter out the DC component and harmonic components in the first electrical signal to obtain a second electrical signal, and input the second electrical signal to the damper 22. The first electrical signal includes the bus voltage V in the high-voltage power supply. bus , rectifier bridge current i Lg and capacitor current i Cb Any one of them; damper 22, used to process the second electrical signal to obtain a virtual damping signal, and input the virtual damping signal to the controller 3 through adder 23.

[0069] The computational processing includes at least one of proportional amplification, differentiation, and integration.

[0070] In this embodiment of the application, a voltage sensor can be used to collect the bus voltage V on the capacitor bus in the high-voltage power supply. bus Alternatively, a current sensor can be used to collect the capacitive current i on the capacitor bus. Cb Alternatively, a current sensor can be used to collect the rectifier bridge current i on rectifier bridge 12. Lg One of these signals is input as the first electrical signal to filter 21. Filter 21 filters the first electrical signal to obtain the second electrical signal, which is then input to damper 22. Damper 22 performs at least one of the following operations on the second electrical signal: proportional amplification, differentiation, and integration, to obtain a virtual damping signal. This virtual damping signal is then input to controller 3 via adder 23.

[0071] For example, the damper 22 performs proportional amplification, differentiation, and integration operations on the second electrical signal s(t), and the resulting virtual damped signal y can be expressed as: , where K p K is the scaling factor. d K is the differential coefficient. i is the integral coefficient.

[0072] In this embodiment, the high-voltage power supply further includes an active damping generation device and a controller. The active damping generation device generates a virtual damping signal and inputs it to the controller. The controller generates a drive signal based on the virtual damping signal. The drive signal is used to suppress the oscillation of the bus voltage in the high-voltage power supply. Based on the first thin-film capacitor, this embodiment sends the virtual damping signal generated by the active damping generation device to the controller for active damping to suppress bus voltage oscillations caused by high impedance at the three-phase power grid supply end or high load power. This retains the advantages of the first thin-film capacitor—small size, long lifespan, and high input power factor—while avoiding system instability caused by high impedance at the three-phase power grid supply end or high load power.

[0073] Figure 8 This is a fourth schematic diagram of a high-voltage power supply in one embodiment, combined with... Figure 7 As shown, the controller 3 includes a voltage loop 31, which includes a first error comparator 311 and a regulator. The adder 23 is disposed between the first error comparator 311 and the regulator.

[0074] In this embodiment, the controller 3 includes a voltage loop 31. Therefore, the controller 3 can include both a voltage loop 31 and a current loop 32, or it can include only the voltage loop 31. Figure 7 and Figure 8 As shown, Figure 7 The controller 3 in the system adopts a dual closed-loop control method based on voltage and current. Figure 8 The controller 3 in the middle adopts a single voltage loop 31 control method to suppress the bus voltage V on the capacitor bus. bus Fluctuations in output voltage V o The impact.

[0075] like Figure 7 As shown, the controller 3 can simultaneously include a voltage loop 31 and a current loop 32. The voltage loop 31 includes a first error comparator 311, a regulator (to distinguish it from the regulator in the current loop 32, the regulator in the voltage loop 31 is referred to as the first regulator 312), and a first limiting circuit 313. The current loop 32 includes a second error comparator 321, a second regulator 322, and a second limiting circuit 323. The bus voltage V is sampled by a sensor. bus or rectifier bridge current i Lg or capacitor current i Cb As the first electrical signal, the second electrical signal is obtained after the DC component and the sixth harmonic component are filtered out by filter 21. The first error comparator 311 obtains the output voltage V. o and reference voltage V o_refThe error voltage signal is superimposed by adder 23 with the virtual damping signal, and the superimposed signal is input to the first regulator 312. The first regulator 312 adjusts the superimposed signal and then limits it through the first limiting circuit 313 to obtain the transformer primary current i. Lr The average value after rectification, which is the current reference value of current loop 32.

[0076] The inner loop (current loop 32) uses the transformer primary current i Lr The average value after rectification is the controlled object, and the second error comparator 321 is based on the transformer primary current i. Lr and transformer primary current i Lr The rectified average value generates a current error signal. The second regulator 322 and the first limiting circuit 313 adjust and limit the current error signal to generate a control signal. The modulation circuit 33 modulates the control signal to obtain a drive signal that can drive the switch of the power device, thereby suppressing the bus voltage V caused by the large impedance of the three-phase power supply terminal 11 or the large load power. bus oscillation.

[0077] like Figure 8 As shown, the controller 3 includes only a voltage loop 31, and the first error comparator 311 in the voltage loop 31 obtains the output voltage V. o and reference voltage V o_ref The error voltage signal is superimposed by the adder 23 and the virtual damping signal, and the superimposed signal is input to the first regulator 312. The first regulator 312 adjusts the superimposed signal to obtain a control signal. The modulation circuit 33 modulates the control signal to obtain a drive signal that can drive the switch of the power device.

[0078] In one possible implementation, adder 23 can also be positioned before current loop 32, such as... Figure 9 As shown, Figure 9 In one embodiment of the high-voltage power supply, the controller 3 includes a voltage loop 31 and a current loop 32. The voltage loop 31 includes a limiting circuit, and the current loop 32 includes a second error comparator 321. An adder 23 is disposed between the limiting circuit and the second error comparator 321.

[0079] In this embodiment, the controller 3 includes a voltage loop 31 and a current loop 32. The voltage loop 31 includes a limiting circuit (i.e., the first limiting circuit 313 in the above embodiment), and the current loop 32 includes a second error comparator 321, a second regulator 322, and a second limiting circuit 323. The first error comparator 311 in the voltage loop 31 acquires the output voltage V. o and reference voltage V o_refThe first regulator 312 processes the error voltage signal to obtain the transformer primary current i. Lr The rectified average value is the current reference value of current loop 32. Adder 23 converts the transformer primary current i... Lr The rectified average value and the virtual damping signal are superimposed, and the superimposed signal is input to the second regulator 322. The second regulator 322 adjusts the superimposed signal, and then the signal is limited by the second limiting circuit 323 to obtain the control signal. The modulation circuit 33 modulates the control signal to obtain a drive signal that can drive the switch of the power device, thereby suppressing the bus voltage oscillation caused by the large impedance of the three-phase power supply terminal 11 or the large load power.

[0080] like Figure 10 As shown, a first thin-film capacitor C is used. bus1 At a 50kW output, when the impedance of the three-phase power supply terminal 11 reaches 50uH, the bus voltage, output voltage, and grid current oscillate; for example... Figure 11 As shown, when adding as Figures 7-9 When the active damping device is used, the oscillation disappears under the same operating conditions.

[0081] In this embodiment, the controller includes a voltage loop, which comprises a first error comparator and a regulator, with an adder positioned between the first error comparator and the regulator. Alternatively, the controller includes a voltage loop and a current loop, where the voltage loop includes a limiting circuit, the current loop includes a second error comparator, and the adder is positioned between the limiting circuit and the second error comparator. This embodiment samples the bus voltage, rectifier bridge current, or capacitor current and sends it to the controller for active damping to suppress bus voltage oscillations caused by high grid impedance or high load power. Furthermore, the high-voltage power supply does not require additional components, reducing losses.

[0082] Figure 12 This is a sixth schematic diagram of a high-voltage power supply in one embodiment. Figure 13 This is a seventh schematic diagram of a high-voltage power supply in one embodiment. Figure 14 This is an eighth schematic diagram of a high-voltage power supply in one embodiment, as shown below. Figures 12-14 As shown, the high-voltage power supply also includes a passive damping device 4, the first end of which is connected to the first thin-film capacitor C. bus1 The first end is connected, and the second end of the passive damping device 4 is connected to the first thin-film capacitor C. bus1 The second end is connected.

[0083] like Figure 15 and Figure 16 As shown, since passive damping can also suppress bus voltage oscillations, in this embodiment of the application, the above-mentioned... Figures 7-9The active and passive damping shown are combined to suppress bus voltage oscillations.

[0084] In this embodiment, the first end of the passive damping device 4 is connected to the first thin-film capacitor C. bus1 The first end is connected, and the second end of the passive damping device 4 is connected to the first thin-film capacitor C. bus1 The second end is connected, that is, the passive damping device 4 and the first thin-film capacitor C. bus1 in parallel.

[0085] Optionally, the passive damping device 4 includes a second thin-film capacitor C with a capacitance value less than a preset capacitance threshold. bus2 And a damping resistor Rd with a resistance value less than a preset resistance threshold, and a second thin-film capacitor C bus2 After being connected in series with the damping resistor Rd, it is then connected to the first thin-film capacitor C. bus1 Parallel connection. The passive damping device 4 may also include multiple second thin-film capacitors C with capacitance values ​​less than a preset capacitance threshold. bus2 and multiple damping resistors Rd with resistance values ​​less than a preset resistance threshold, each second thin-film capacitor C bus2 It is connected in series with the corresponding damping resistor Rd, and then connected to the first thin-film capacitor C. bus1 in parallel.

[0086] like Figures 12-14 As shown, the passive damping device 4 includes a second thin-film capacitor C with a capacitance value less than a preset capacitance threshold. bus2 A damping resistor Rd with a resistance value less than a preset resistance threshold; and a second thin-film capacitor C. bus2 The first terminal and the first thin film capacitor C bus1 The first end is connected to the second thin-film capacitor C. bus2 The second terminal is connected to the first terminal of the damping resistor Rd, and the second terminal of the damping resistor Rd is connected to the first thin-film capacitor C. bus1 The second end is connected.

[0087] Specifically, the second thin-film capacitor C bus2 The damping resistor Rd is connected in series with the first thin-film capacitor C. bus1 Parallel connection. This involves splitting the capacitor bus into two parts: one part without a damping resistor Rd, and the other part connected in series with a small-value damping resistor Rd to balance power consumption, ripple, and damping effect.

[0088] Optionally, the above can also be Figure 15 The passive damping shown is Figures 7-9 The active damping generating device shown is combined.

[0089] In this embodiment, the high-voltage power supply further includes a passive damping device. The first end of the passive damping device is connected to the first end of the first thin-film capacitor, and the second end of the passive damping device is connected to the second end of the first thin-film capacitor. This embodiment combines passive and active damping, improving the effectiveness of bus voltage oscillation and providing multiple oscillation suppression methods to facilitate application in different scenarios, thus enhancing the universality of oscillation suppression.

[0090] In one embodiment, a voltage control method is provided, which is applied to a controller for controlling the voltage output device of any of the above.

[0091] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above method embodiments.

[0092] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of any of the above method embodiments.

[0093] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0094] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0095] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A high-voltage power supply, characterized in that, The high-voltage power supply includes a voltage output device, an active damping device, a controller, and a passive damping device. The voltage output device includes a three-phase power grid supply terminal, a rectifier bridge, a first thin-film capacitor with a capacitance value less than a preset capacitance threshold, and a high-voltage transformer. The active damping generation device includes a filter, a damper, and an adder. The first thin-film capacitor is connected in parallel to the DC bus of the rectifier bridge output and the high-voltage transformer input. The first end of the passive damping device is connected to the first end of the first thin-film capacitor, and the second end of the passive damping device is connected to the second end of the first thin-film capacitor. The rectifier bridge is used to convert the AC voltage output from the three-phase power grid supply terminal into a first DC voltage. The first thin-film capacitor is used to filter the first DC voltage to obtain the second DC voltage; The high-voltage transformer is used to step up the second DC voltage to obtain the output voltage; The filter is used to acquire a first electrical signal, filter out the DC component and harmonic component in the first electrical signal to obtain a second electrical signal, and input the second electrical signal to the damper; the first electrical signal includes any one of the bus voltage, rectifier bridge current and capacitor current in the high voltage power supply; The damper is used to process the second electrical signal to obtain a virtual damping signal, and the virtual damping signal is input to the controller through the adder; The controller is used to generate a drive signal based on the virtual damping signal; the drive signal is used to suppress the oscillation of the bus voltage in the high-voltage power supply.

2. The high-voltage power supply according to claim 1, characterized in that, The controller includes a voltage loop, which includes a first error comparator and a regulator, with the adder disposed between the first error comparator and the regulator.

3. The high-voltage power supply according to claim 1, characterized in that, The computational processing includes at least one of scaling, differentiation, and integration.

4. The high-voltage power supply according to claim 1, characterized in that, The controller includes a voltage loop and a current loop. The voltage loop includes a limiting circuit, and the current loop includes a second error comparator. The adder is disposed between the limiting circuit and the second error comparator.

5. The high-voltage power supply according to claim 1, characterized in that, The passive damping device includes a second thin-film capacitor with a capacitance value less than the preset capacitance threshold and a damping resistor with a resistance value less than the preset resistance threshold; the first end of the second thin-film capacitor is connected to the first end of the first thin-film capacitor, the second end of the second thin-film capacitor is connected to the first end of the damping resistor, and the second end of the damping resistor is connected to the second end of the first thin-film capacitor.

6. A voltage control method, characterized in that, The method is applied to a controller in a high-voltage power supply as described in any one of claims 1-5, the controller being used to control a voltage output device in the high-voltage power supply.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 6.

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