High-voltage rectification and voltage stabilization power supply circuit system and control method of power supply

Abstract

This application relates to the field of power supply circuit technology, providing a high-voltage rectified and regulated power supply circuit system and a power supply control method. The system includes: a main voltage source for providing a target output voltage; a main switching circuit for converting the target AC output voltage into DC; a DC bus connected to the load; a clamping voltage source for providing a clamping voltage lower than the target output voltage; a clamping switch circuit for converting the AC clamping voltage into DC; an auxiliary voltage source connected to the DC bus; and a control unit for controlling the auxiliary voltage source to pre-charge the power devices in the circuit system before the main switching circuit and the clamping switch circuit are turned on; after pre-charging, power is supplied to the load through the DC bus by controlling the alternating conduction of the main switching circuit and the clamping switch circuit. This application, through the configuration of multiple voltage sources with similar voltage values ​​and an auxiliary voltage source, can establish a power supply system with stable output, low power storage requirements, and low specifications for power devices.

Description

Technical Field

[0001] This application relates to the field of power supply circuit technology, and in particular to high-voltage rectified and regulated power supply circuit systems and power supply control methods. Background Technology

[0002] In the current field of high-voltage, high-power power supply, especially in applications where high-voltage AC is rectified to DC (e.g., at the 10kV level), the coordinated operation and smooth switching of multiple power supply systems are core challenges in building efficient and stable power supply systems. Traditional designs typically rely on mechanical switches or electronic switches based on a single type of semiconductor device (such as an Insulated Gate Bipolar Transistor, IGBT) to achieve the access and switching of multiple power sources. During the transient process of switching, these solutions often generate significant electrical stress due to drastic voltage or current changes, easily leading to inrush currents, voltage spikes, and severe electromagnetic interference. These problems not only place extremely stringent requirements on the voltage withstand level, switching frequency, and power capacity of core power devices such as IGBTs, resulting in high hardware costs and large size, but also restrict the overall reliability, energy utilization efficiency, and power density of the system.

[0003] Specifically, in high-voltage rectifier and voltage regulator circuits, energy storage components such as filter capacitors and load inductors are typically connected to the DC bus. At the moment of system power-on or power switching, without an effective pre-charging or energy management mechanism, the rapid charging and discharging process of the energy storage components will further exacerbate current surges and voltage fluctuations. This not only threatens the safe operation of power devices and causes heat loss, but also makes it difficult to effectively recover and reuse transient energy in the system. To address these challenges, existing technical solutions tend to employ complex external buffer circuits, absorption circuits, or directly select higher-specification power devices. However, while this alleviates electrical stress, it also significantly increases the complexity of the system, the design difficulty, and the overall construction and operation costs throughout its lifecycle. Summary of the Invention

[0004] This application provides a high-voltage rectifier and regulated power supply circuit system and a power supply control method. By configuring multiple voltage sources with similar voltage values ​​and an auxiliary voltage source, a power supply system with stable output, low power storage and low requirements for power device specifications can be established.

[0005] This application provides a high-voltage rectifier and regulated power supply circuit system, comprising: a main voltage source for providing a target output voltage; a main switching circuit connected between the main voltage source and the DC bus for converting the target output voltage of AC power into DC power; the DC bus being connected to a load; a clamping voltage source for providing a clamping voltage lower than the target output voltage; a clamping switch circuit connected between the clamping voltage source and the DC bus for converting the clamping voltage of AC power into DC power; an auxiliary voltage source connected to the DC bus; and a control unit for controlling the auxiliary voltage source to pre-charge the power devices in the circuit system before the main switching circuit and the clamping switch circuit are turned on; and, after pre-charging, supplying power to the load by controlling the alternating conduction of the main switching circuit and the clamping switch circuit.

[0006] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, a buffer capacitor is connected in parallel across the two ends of the switching transistor in the main switching circuit and / or clamping switching circuit. The buffer capacitor is used to reduce output voltage fluctuations when the corresponding switching transistor is turned on or off.

[0007] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, before the switching transistor of the main switching circuit is turned off, the switching transistor of the clamping switching circuit is turned on. The on-time of the switching transistor of the main switching circuit and the on-time of the switching transistor of the clamping switching circuit partially overlap, so as to clamp the voltage of the DC bus using the clamping voltage; wherein, the difference between the target output voltage and the clamping voltage is less than a preset difference.

[0008] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, the main switching circuit includes a first diode, a second diode, a first transistor, a second transistor, a first resistor, a second resistor, a first capacitor, and a second capacitor; the control terminals of the first transistor and the second transistor are used to receive the main voltage source start-up and shutdown pulses sent by the control unit; the anode of the first diode is connected to the anode of the main voltage source, the cathode of the first diode is connected to the first terminal of the first transistor, the first terminal of the first transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the first terminal of the first capacitor, the second terminal of the first capacitor is connected to the second terminal of the first transistor, and the second terminal of the first transistor is connected to the first terminal of the DC bus; the cathode of the second diode is connected to the cathode of the main voltage source, the anode of the second diode is connected to the first terminal of the second transistor, the first terminal of the second transistor is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the first terminal of the second capacitor, the second terminal of the second capacitor is connected to the second terminal of the second transistor, and the second terminal of the second transistor is connected to the second terminal of the DC bus.

[0009] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, the clamping switch circuit includes a third diode, a fourth diode, a third transistor, a fourth transistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor; the control terminals of the third transistor and the fourth transistor are used to receive clamping voltage source on / off pulses from the control unit; the anode of the third diode is connected to the anode of the clamping voltage source, the cathode of the third diode is connected to the first terminal of the third transistor, the first terminal of the third transistor is connected to the first terminal of the third resistor, the second terminal of the third resistor is connected to the first terminal of the third capacitor, the second terminal of the third capacitor is connected to the second terminal of the third transistor, and the second terminal of the third transistor is connected to the first terminal of the DC bus; the cathode of the fourth diode is connected to the cathode of the clamping voltage source, the anode of the fourth diode is connected to the first terminal of the fourth transistor, the first terminal of the fourth transistor is connected to the first terminal of the fourth resistor, the second terminal of the fourth resistor is connected to the first terminal of the fourth capacitor, the second terminal of the fourth capacitor is connected to the second terminal of the fourth transistor, and the second terminal of the fourth transistor is connected to the second terminal of the DC bus.

[0010] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, the auxiliary voltage provided by the auxiliary voltage source is AC. The high-voltage rectifier and regulated power supply circuit system also includes an auxiliary rectifier circuit, wherein the auxiliary rectifier circuit includes a fifth diode and a sixth diode; the anode of the fifth diode is connected to the anode of the auxiliary voltage source, and the cathode of the fifth diode is connected to the first terminal of the DC bus; the cathode of the sixth diode is connected to the cathode of the auxiliary voltage source, and the anode of the sixth diode is connected to the second terminal of the DC bus.

[0011] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, the DC bus is provided with a first inductor, a seventh diode and an eighth diode; the first end of the DC bus is connected to the first end of the first inductor, the second end of the first inductor is connected to the positive terminal of the seventh diode, the negative terminal of the seventh diode is connected to the first end of the load; the second end of the DC bus is connected to the negative terminal of the eighth diode, and the positive terminal of the eighth diode is connected to the second end of the load.

[0012] According to the high-voltage rectifier and regulated power supply circuit system provided in this application, a second inductor, a third inductor and a fourth inductor are also included; the second inductor is connected between the positive terminal of the main voltage source and the main switching circuit; the third inductor is connected between the positive terminal of the clamping voltage source and the clamping switching circuit; and the fourth inductor is connected between the positive terminal of the auxiliary voltage source and the fifth diode.

[0013] This application also provides a control method for a high-voltage rectified and regulated power supply. Using the above-mentioned high-voltage rectified and regulated power supply circuit system, the control method includes: controlling an auxiliary voltage source to pre-charge the power devices in the circuit system; turning on the main switching circuit so that the main voltage source provides a target output voltage to the load through the DC bus; before turning off the main switching circuit, turning on a clamping switch circuit so that the clamping voltage source outputs a clamping voltage lower than the target output voltage to the DC bus; wherein the on-time of the switching transistor in the main switching circuit and the on-time of the switching transistor in the clamping switch circuit partially overlap to clamp voltage fluctuations on the DC bus.

[0014] The control method for a high-voltage rectified and regulated power supply provided in this application further includes: when the main switching circuit or clamping switching circuit switches from on to off, using a buffer capacitor connected in parallel across the switching transistor to reduce output voltage fluctuations.

[0015] This application provides a high-voltage rectified and regulated power supply circuit system and a power supply control method. The high-voltage rectified and regulated power supply circuit system includes: a main voltage source for providing a target output voltage; a main switching circuit connected between the main voltage source and the DC bus for converting the target output voltage of AC power into DC power; the DC bus connected to the load; a clamping voltage source for providing a clamping voltage lower than the target output voltage; a clamping switch circuit connected between the clamping voltage source and the DC bus for converting the clamping voltage of AC power into DC power; an auxiliary voltage source connected to the DC bus; and a control unit for controlling the auxiliary voltage source to pre-charge the power devices in the circuit system before the main switching circuit and the clamping switch circuit are turned on; after pre-charging, power is supplied to the load by controlling the alternating conduction of the main switching circuit and the clamping switch circuit. Through the above methods, this application can achieve smooth and shock-free switching between multiple voltage sources under high voltage and high power conditions, effectively manage the energy of energy storage elements in the system, reduce the electrical stress and specification requirements on key power devices, thereby improving system reliability, efficiency, and power density while optimizing the overall cost structure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the high-voltage rectifier and regulated power supply circuit system provided in the embodiments of this application.

[0018] Figure 2This is one of the flowcharts illustrating the control method of the high-voltage rectified and regulated power supply provided in the embodiments of this application.

[0019] Figure 3 This is the second flowchart illustrating the control method of the high-voltage rectified and regulated power supply provided in the embodiments of this application.

[0020] Figure 4 This is a schematic diagram of the power grid system architecture provided in the embodiments of this application.

[0021] Figure 5 This is a timing diagram of the enable signal and the switching signal provided in the embodiments of this application.

[0022] Figure 6 This is a timing diagram of the voltage and current of the power devices of the main voltage source provided in the embodiments of this application. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0025] This application provides a high-voltage rectifier and regulated power supply circuit system. Please refer to [link / reference]. Figure 1 , Figure 1 This is a schematic diagram of the high-voltage rectifier and regulated power supply circuit system provided in an embodiment of this application. In this embodiment, the high-voltage rectifier and regulated power supply circuit system may include a main voltage source 110, a main switching circuit 120, a clamping voltage source 130, a clamping switching circuit 140, an auxiliary voltage source 150, and a control unit 160.

[0026] The main voltage source 110 is used to provide the target output voltage.

[0027] The main switch circuit 120 is connected between the main voltage source 110 and the DC bus 170 to convert the target output voltage of AC power into DC power; the DC bus 170 is connected to the load 180.

[0028] Clamping voltage source 130 is used to provide a clamping voltage lower than the target output voltage.

[0029] The clamping switch circuit 140 is connected between the clamping voltage source 130 and the DC bus 170, and is used to convert the AC clamping voltage into DC voltage.

[0030] Auxiliary voltage source 150, connected to DC bus 170.

[0031] The main switching circuit 120 and the clamping switching circuit 140 can convert the target output voltage of AC power into DC power. Furthermore, the switching circuit can include multiple power switching devices (such as IGBTs, MOSFETs, etc.), which can be turned on and off according to a certain control strategy, thereby rectifying and filtering the AC power supplied by the voltage source.

[0032] Taking the main switching circuit as an example, when AC power enters the main switching circuit, the switching devices turn on and off in an orderly manner according to the control signal, converting the negative half-cycle of the AC power into the positive half-cycle, or performing full-wave rectification, and finally obtaining DC power at the output terminal.

[0033] The control unit 160 is used to control the auxiliary voltage source 150 to precharge the power devices in the circuit system before the main switch circuit 120 and the clamping switch circuit 140 are turned on; after the precharging is completed, the control unit 160 supplies power to the load by controlling the alternating conduction of the main switch circuit 120 and the clamping switch circuit 140.

[0034] The logic control of the control unit 160 is mainly divided into two stages: 1) Pre-charging stage: Before the main switch circuit 120 and the clamping switch circuit 140 are turned on, the auxiliary voltage source 150 is controlled to pre-charge the DC bus 170 and related energy storage components such as filter capacitors and inductors to establish the initial voltage and avoid current surges and voltage spikes when the main power devices are put into operation.

[0035] 2) Normal operation phase: After pre-charging is completed, the control unit 160 controls the alternating conduction and cutoff of the main switch circuit 120 and the clamping switch circuit 140 to achieve precise regulation and stabilization of the DC bus voltage, thereby continuously and stably supplying power to the load 180. The alternating conduction control can be adjusted in real time according to parameters such as bus voltage feedback and load demand to achieve efficient and low-stress power transmission.

[0036] In this embodiment, by constructing a circuit architecture in which the "main voltage source, clamping voltage source, and auxiliary voltage source" work together, and by using a timing-based intelligent control strategy, the performance and reliability of the high-voltage, high-power power supply system can be optimized.

[0037] Specifically, at the system architecture level, a clamping voltage source lower than the target output voltage is introduced to provide an active clamping mechanism for the DC bus voltage during main power switching and load surges. This limits voltage fluctuations to a preset safe range, thereby significantly reducing the peak voltage stress and switching losses experienced by the switching devices. Simultaneously, the independent auxiliary voltage source and pre-charge function enable the system to soft-start charge the DC bus and downstream filter capacitors before power-on, eliminating inrush current during closing, protecting critical components such as the rectifier bridge and switching transistors, and improving the safety and lifespan of the system initialization.

[0038] At the control strategy level, smooth switching between power supplies and fine-grained energy management are achieved by alternating the conduction of the main switch and the clamping switch. This method not only avoids abrupt changes in voltage and current, ensuring high output stability, but also directs the energy released by energy storage components such as inductors to the clamping voltage source or its input terminal during sudden load changes, reducing heat dissipation, thereby improving overall energy efficiency and suppressing electromagnetic interference.

[0039] Ultimately, the aforementioned structural and control improvements bring comprehensive system-level advantages. Due to the significant reduction in electrical and thermal stress, the requirements for the withstand voltage, current, and switching frequency of power components in the main switching circuit can be relaxed, allowing the use of lower-cost standard industrial-grade components. Simultaneously, complex external buffer and protection circuits are simplified or even eliminated, reducing hardware costs and system complexity. Furthermore, a more stable operating state and fewer components jointly improve the system's power density, energy utilization efficiency, and long-term operational reliability, making it particularly suitable for harsh industrial scenarios such as 10kV high-voltage DC power supply, achieving an optimal balance between cost and reliability while ensuring high performance.

[0040] The present application provides a high-voltage rectifier and regulated power supply circuit system that can realize multi-voltage source power switching based on power switching devices. The system includes a main voltage source, a clamping voltage source and an auxiliary voltage source. By setting the output voltages of the main voltage source and the clamping voltage source to adjacent voltage values ​​within a preset range, and configuring the auxiliary voltage source to perform pre-charging operation, a composite power supply architecture with high output stability, good energy storage efficiency and low requirements for electrical parameters of power devices is constructed.

[0041] Specifically, by configuring a dual voltage source clamping circuit, the voltage fluctuation amplitude at the load end can be reduced, the stress load and current surge load of the power switching device can be reduced, which not only extends the service life of the device, but also reduces the power loss during the switching process, thereby reducing the specification requirements of the power device and reducing the system operating cost.

[0042] Furthermore, a high-voltage AC / DC conversion module employing a parallel capacitor topology is presented. This module combines voltage regulation and energy storage functions during the high-voltage AC-to-DC conversion process. This composite design effectively suppresses electromagnetic interference caused by high-frequency switching and absorbs voltage transient disturbances on both the grid and load sides, thereby improving the system's electromagnetic compatibility and power quality under high-voltage conditions.

[0043] In addition, the added auxiliary voltage source can perform a controllable pre-charge operation on the DC bus and filter network before the main power circuit of the system is put into operation. This pre-charge mechanism can smoothly establish the DC bus voltage, suppress the surge voltage, junction temperature and inductor surge current generated at the moment of conduction of power switching devices, thereby reducing the electrical stress and heat dissipation of power devices and further improving the system reliability and energy efficiency.

[0044] In summary, the embodiments of this application, through multi-voltage source coordinated control and optimized circuit structure design, systematically achieve multiple technical effects such as reduced electrical stress of power devices, reduced switching losses, and relaxed device parameter requirements while ensuring stable transmission of high-voltage, high-power electricity. This provides a highly reliable, efficient, and cost-optimized solution for high-voltage DC power supply systems.

[0045] In some embodiments, a buffer capacitor is connected in parallel across the two ends of the switching transistor in the main switching circuit and / or clamping switching circuit. The buffer capacitor is used to reduce output voltage fluctuations when the corresponding switching transistor is turned on or off.

[0046] As a type of power switching device, the switching transistor generates a sharp voltage spike when it is turned off or on. At this time, a parallel buffer capacitor provides a low-impedance discharge path for this sudden current surge. Part of the magnetic energy stored in the inductor is transferred to the buffer capacitor, where it is converted into electric field energy and stored. This suppresses the rate of voltage rise applied across the switching transistor, preventing the voltage spike from exceeding the device's rated withstand voltage.

[0047] In some embodiments, before the switching transistor of the main switching circuit is turned off, the switching transistor of the clamping switching circuit is turned on. The on-time of the switching transistor of the main switching circuit and the on-time of the switching transistor of the clamping switching circuit partially overlap, so as to clamp the voltage of the DC bus using the clamping voltage; wherein the difference between the target output voltage and the clamping voltage is less than a preset difference.

[0048] In this embodiment, the control unit establishes a smooth handover and cooperative working mechanism between the main switch and the clamping switch through a fine timing control strategy.

[0049] In some related technologies, the clamping switch circuit only begins to conduct after the main switching circuit is completely turned off. This creates a brief "power-off time" between the two switching actions, during which the DC bus voltage may experience an uncontrolled voltage spike or oscillation due to parasitic inductance in the circuit.

[0050] The embodiments of this application overcome this limitation by turning on the switching transistor of the clamping switch circuit (hereinafter referred to as the "clamping switch") before the switching transistor of the main switch circuit (hereinafter referred to as the "main switch") is turned off. This results in the main switch and the clamping switch being in the on state simultaneously during the transition period when the main switch is completely turned off, and their on-times have a partial overlap.

[0051] When the main switch is finally completely turned off, most or all of the load current has been transferred to the clamping switch path. Since the clamping switch is connected to a lower clamping voltage, the DC bus voltage is effectively clamped near the clamping voltage, thereby actively suppressing voltage spikes that may be caused by parasitic parameters when the main switch is turned off.

[0052] It should be added that the difference between the target output voltage and the clamping voltage is less than the preset difference. Because the difference is small enough, the clamping voltage can closely follow the target output voltage, stabilizing the bus voltage within a safe and predictable range during the overlap period and after the main switch is turned off, preventing overvoltage. In addition, the small voltage difference makes the current transfer process smoother, and the requirements for current stress on the switching devices and control timing accuracy are relatively relaxed, improving the stability and robustness of the control.

[0053] In some embodiments, the main switching circuit may include a first diode, a second diode, a first transistor, a second transistor, a first resistor, a second resistor, a first capacitor, and a second capacitor.

[0054] Specifically, the control terminals of the first transistor and the second transistor are used to receive the main voltage source turn-on / off pulses of the control unit; the anode of the first diode is connected to the anode of the main voltage source, the cathode of the first diode is connected to the first terminal of the first transistor, the first terminal of the first transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the first terminal of the first capacitor, the second terminal of the first capacitor is connected to the second terminal of the first transistor, and the second terminal of the first transistor is connected to the first terminal of the DC bus; the cathode of the second diode is connected to the cathode of the main voltage source, the anode of the second diode is connected to the first terminal of the second transistor, the first terminal of the second transistor is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the first terminal of the second capacitor, the second terminal of the second capacitor is connected to the second terminal of the second transistor, and the second terminal of the second transistor is connected to the second terminal of the DC bus.

[0055] In some embodiments, the clamping switch circuit may include a third diode, a fourth diode, a third transistor, a fourth transistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor.

[0056] Specifically, the control terminals of the third transistor and the fourth transistor are used to receive the clamping voltage source on / off pulses from the control unit; the anode of the third diode is connected to the anode of the clamping voltage source, the cathode of the third diode is connected to the first terminal of the third transistor, the first terminal of the third transistor is connected to the first terminal of the third resistor, the second terminal of the third resistor is connected to the first terminal of the third capacitor, the second terminal of the third capacitor is connected to the second terminal of the third transistor, and the second terminal of the third transistor is connected to the first terminal of the DC bus; the cathode of the fourth diode is connected to the cathode of the clamping voltage source, the anode of the fourth diode is connected to the first terminal of the fourth transistor, the first terminal of the fourth transistor is connected to the first terminal of the fourth resistor, the second terminal of the fourth resistor is connected to the first terminal of the fourth capacitor, the second terminal of the fourth capacitor is connected to the second terminal of the fourth transistor, and the second terminal of the fourth transistor is connected to the second terminal of the DC bus.

[0057] In some embodiments, the auxiliary voltage provided by the auxiliary voltage source is AC power, and the high-voltage rectifier and regulated power supply circuit system further includes an auxiliary rectifier circuit, wherein the auxiliary rectifier circuit includes a fifth diode and a sixth diode; the anode of the fifth diode is connected to the anode of the auxiliary voltage source, and the cathode of the fifth diode is connected to the first terminal of the DC bus; the cathode of the sixth diode is connected to the cathode of the auxiliary voltage source, and the anode of the sixth diode is connected to the second terminal of the DC bus.

[0058] In some embodiments, the DC bus may be provided with a first inductor, a seventh diode, and an eighth diode.

[0059] Specifically, the first end of the DC bus is connected to the first end of the first inductor, the second end of the first inductor is connected to the anode of the seventh diode, and the cathode of the seventh diode is connected to the first end of the load; the second end of the DC bus is connected to the cathode of the eighth diode, and the anode of the eighth diode is connected to the second end of the load.

[0060] In some embodiments, the high-voltage rectifier and regulated power supply circuit system may further include a second inductor, a third inductor, and a fourth inductor.

[0061] Specifically, the second inductor is connected between the positive terminal of the main voltage source and the main switching circuit; the third inductor is connected between the positive terminal of the clamping voltage source and the clamping switching circuit; and the fourth inductor is connected between the positive terminal of the auxiliary voltage source and the fifth diode.

[0062] This application also provides a control method for a high-voltage rectified and regulated power supply, using the aforementioned high-voltage rectified and regulated power supply circuit system. Please refer to... Figure 2 , Figure 2 This is one of the flowcharts illustrating the control method for a high-voltage rectified and regulated power supply provided in this application embodiment. In this embodiment, the control method for the high-voltage rectified and regulated power supply may include steps S210 to S220, each step of which is detailed below: S210: Controls the auxiliary voltage source to precharge the power devices in the circuit system.

[0063] S220: Alternately conduct the main voltage source and the clamping voltage source to provide output voltage to the load through the DC bus; wherein, the conduction time of the switching transistor of the main switching circuit and the conduction time of the switching transistor of the clamping switching circuit partially overlap to clamp the voltage fluctuation of the DC bus.

[0064] In this embodiment, power can be supplied to the load by controlling the alternating conduction of the main switch circuit and the clamping switch circuit.

[0065] The auxiliary voltage source pre-charges the power components in the circuit system. At the start-up of the high-voltage rectified and regulated power supply, power components such as capacitors and inductors may be uncharged or at low voltage. The auxiliary voltage source provides a certain voltage to these components, gradually increasing their voltage. When the main switching circuit is ready to turn on, the power components already have a certain voltage foundation, thus enabling zero-voltage turn-on of the main switch in the subsequent conduction phase. Zero-voltage turn-on means that at the instant the switch is turned on, the voltage across the switch is zero or close to zero, thereby avoiding startup losses and stress caused by voltage surges during switch-on.

[0066] In this embodiment, zero-voltage turn-on is achieved through pre-charging in S210, eliminating start-up losses and stress. Overlapping conduction control in S220 enables zero-voltage or low-voltage turn-off of the main switch / clamping switch, eliminating turn-off losses and voltage spikes. Therefore, this embodiment minimizes switching losses, significantly improving overall system conversion efficiency and reducing thermal and electrical stresses on power switching devices, greatly extending their lifespan and enhancing the long-term reliability of the system.

[0067] Please see Figure 3 , Figure 3 This is a second schematic flowchart of the control method for a high-voltage rectified and regulated power supply provided in this application embodiment. In this embodiment, the control method for the high-voltage rectified and regulated power supply may include steps S310 to S340, each step of which is as follows: S310: Controls the auxiliary voltage source to precharge the power devices in the circuit system.

[0068] S320: Turns on the main switch circuit so that the main voltage source provides the target output voltage to the load through the DC bus.

[0069] S330: Before turning off the main switch circuit, turn on the clamp switch circuit so that the clamp voltage source outputs a clamp voltage lower than the target output voltage to the DC bus.

[0070] S340: Before turning off the clamping switch circuit, turn on the main switch circuit so that the main switch circuit outputs the target output voltage to the DC bus.

[0071] The conduction time of the switching transistor in the main switching circuit and the conduction time of the switching transistor in the clamping switching circuit partially overlap to clamp the voltage fluctuations of the DC bus.

[0072] In this embodiment, the main switch circuit is turned on so that the main voltage source provides the target output voltage to the load through the DC bus. When the main switch circuit is turned on, the main voltage source is connected to the DC bus, and the electrical energy of the main voltage source can be transmitted to the load end through the DC bus to provide the load with the required target output voltage. At this time, since the zero-voltage turn-on of the main switch has been achieved during the pre-charging stage, the starting loss and stress are eliminated in this process.

[0073] Before turning off the main switching circuit, the clamping switch circuit is turned on so that the clamping voltage source outputs a clamping voltage lower than the target output voltage to the DC bus. The on-time of the switching transistor in the main switching circuit and the switching transistor in the clamping switch circuit partially overlap. When the main switching circuit is about to turn off, the clamping switch circuit turns on, and the clamping voltage source applies a clamping voltage lower than the target output voltage to the DC bus. This overlapping conduction control allows the voltage across the main switch to gradually decrease when it turns off, achieving zero-voltage turn-off or low-voltage turn-off. Zero-voltage or low-voltage turn-off avoids turn-off losses and voltage spikes caused by voltage surges at the moment of switch turn-off.

[0074] Similarly, the conduction time of the switching transistor in the main switching circuit and the switching transistor in the clamping switching circuit partially overlap. When the clamping switching circuit is about to turn off, the main switching circuit turns on, and the main voltage source applies the target output voltage to the DC bus. This overlapping conduction control allows the voltage across the clamping switch to gradually decrease when it turns off, achieving zero-voltage turn-off or low-voltage turn-off, thereby avoiding turn-off losses and voltage spikes caused by voltage surges at the moment of switch turn-off.

[0075] In this embodiment, zero-voltage turn-on of the main switch is achieved through pre-charging, and zero-voltage turn-off or low-voltage turn-off of the main switch is achieved through overlapping conduction control, effectively eliminating start-up and turn-off losses and minimizing switching losses. Reduced switching losses mean less energy waste during power conversion, and more energy can be effectively transferred to the load. In some embodiments, the control method of the high-voltage rectified and regulated power supply further includes: reducing output voltage fluctuations by using a buffer capacitor connected in parallel across the switching transistor when the main switch circuit or clamping switch circuit switches from on to off.

[0076] When the main switching circuit or clamping switching circuit switches from on to off, a buffer capacitor connected in parallel across the switching transistor can be used to reduce output voltage fluctuations. When the switching circuit changes from on to off, the current and voltage in the circuit change abruptly, which may cause output voltage fluctuations. The buffer capacitor can absorb some energy at the moment the switch turns off, thereby reducing output voltage fluctuations and making the output voltage more stable.

[0077] Please see Figure 4 , Figure 4 This is a schematic diagram of the power grid system architecture provided in the embodiments of this application.

[0078] In this embodiment, transistors Q1 to Q4 are all N-type IGBTs. The main voltage source is a 10kV AC main voltage source, which may also be equipped with a fifth resistor R5. The main switching circuit is used to implement 10kV power supply and buffering. The clamping voltage source is a 9.2kV AC clamping voltage source, which may also be equipped with a sixth resistor R6. The clamping switching circuit is used to implement 9.2kV power supply and buffering. The auxiliary voltage source is a 10kV AC auxiliary voltage source, which may also be equipped with a seventh resistor R7. The load may include an eighth resistor R8 and a fifth capacitor C5, wherein the fifth capacitor C5 can perform energy storage.

[0079] Specifically, the gate (G) of the first transistor Q1 and the gate (G) of the second transistor Q2 are used to receive the main voltage source turn-on / off pulses of the control unit; the anode of the first diode D1 is connected to the anode of the main voltage source, the cathode of the first diode D1 is connected to the collector (C) of the first transistor Q1, the collector (C) of the first transistor Q1 is connected to the first terminal of the first resistor R1, the second terminal of the first resistor R1 is connected to the first terminal (anode) of the first capacitor C1, the second terminal of the first capacitor C1 is connected to the emitter (E) of the first transistor Q1, and the emitter (E) of the first transistor Q1 is connected to the first terminal of the DC bus.

[0080] The negative terminal of the second diode D2 is connected to the negative terminal of the main voltage source, the positive terminal of the second diode D2 is connected to the emitter (E) of the second transistor Q2, the emitter (E) of the second transistor Q2 is connected to the first terminal of the second resistor R2, the second terminal of the second resistor R2 is connected to the first terminal (positive terminal) of the second capacitor C2, the second terminal of the second capacitor C2 is connected to the collector (C) of the second transistor Q2, and the collector (C) of the second transistor Q2 is connected to the second terminal of the DC bus.

[0081] The gate (G) of the third transistor Q3 and the gate (G) of the fourth transistor Q4 are used to receive the clamping voltage source on / off pulses of the control unit; the anode of the third diode D3 is connected to the anode of the clamping voltage source, the cathode of the third diode D3 is connected to the collector (C) of the third transistor Q3, the collector (C) of the third transistor Q3 is connected to the first terminal of the third resistor R3, the second terminal of the third resistor R3 is connected to the first terminal (anode) of the third capacitor C3, the second terminal of the third capacitor C3 is connected to the emitter (E) of the third transistor Q3, and the emitter (E) of the third transistor Q3 is connected to the first terminal of the DC bus.

[0082] The negative terminal of the fourth diode D4 is connected to the negative terminal of the clamping voltage source, the positive terminal of the fourth diode D4 is connected to the emitter (E) of the fourth transistor Q4, the emitter (E) of the fourth transistor Q4 is connected to the first terminal of the fourth resistor R4, the second terminal of the fourth resistor R4 is connected to the first terminal (positive terminal) of the fourth capacitor C4, the second terminal of the fourth capacitor C4 is connected to the collector (C) of the fourth transistor Q4, and the collector (C) of the fourth transistor Q4 is connected to the second terminal of the DC bus.

[0083] The positive terminal of the fifth diode D5 is connected to the positive terminal of the auxiliary voltage source, and the negative terminal of the fifth diode D5 is connected to the first terminal of the DC bus; the negative terminal of the sixth diode D6 is connected to the negative terminal of the auxiliary voltage source, and the positive terminal of the sixth diode D6 is connected to the second terminal of the DC bus.

[0084] The first end of the DC bus is connected to the first end of the first inductor L1, and the second end of the first inductor L1 is connected to the anode of the seventh diode D7. The cathode of the seventh diode D7 is connected to the first end of the load. The second end of the DC bus is connected to the cathode of the eighth diode D8, and the anode of the eighth diode D8 is connected to the second end of the load. Here, the first inductor L1 is the load inductance.

[0085] The second inductor L2 is connected between the positive terminal of the main voltage source and the main switching circuit; the third inductor L3 is connected between the positive terminal of the clamping voltage source and the clamping switching circuit; and the fourth inductor L4 is connected between the positive terminal of the auxiliary voltage source and the fifth diode D5.

[0086] The first end of the DC bus is the DC bus junction point P+, and the second end of the DC bus is the DC bus junction point P-.

[0087] This embodiment employs a hybrid energy coupling network, which combines a main voltage source with a target output voltage and a clamping voltage source that is close to but slightly lower than the target output voltage. The two power circuits are controlled by their respective IGBTs to form a dual-voltage-source bus pulse power conversion system, providing a stable operating voltage to the power load.

[0088] The capacitors connected in parallel with the IGBT transistors buffer instantaneous changes in the voltage source and fluctuations in the load inductor-induced voltage when the IGBT is turned on and off, thus stabilizing the voltage. Simultaneously, an auxiliary voltage source identical to the target output voltage pre-charges the inductors and capacitors in the power network before the voltage source starts, reducing the voltage difference between the collector and emitter when the IGBT is turned off, minimizing conduction losses, and effectively reducing electromagnetic interference in the power network.

[0089] The system includes independent rectifier switching circuits at the main voltage source and clamping voltage source terminals. Each circuit is designed according to the AC or DC characteristics of the power supply and consists of a switchable IGBT transistor and a parallel capacitor. When the IGBT transistor is turned on, the main circuit is connected, and the voltage source simultaneously supplies power to the downstream load and charges the energy storage capacitor on the load side, achieving energy storage. Furthermore, the IGBT transistor is equipped with an anti-parallel freewheeling diode, which provides a path for the induced current of the downstream inductive load when the IGBT transistor is turned off, thereby ensuring that the IGBT operates under safe conditions. The capacitor connected in parallel with the IGBT transistor suppresses voltage overshoot and voltage change rate during the switching process, effectively reducing IGBT transistor switching losses. A diode is also provided in the current flow direction to ensure unidirectional current flow, providing isolation protection for the voltage source.

[0090] For example, two IGBT transistor switching circuits with opposite directions can be provided to control the output of the AC voltage source during the positive and negative half-cycles, respectively. By applying a pulse signal to the gate of the IGBT transistor, its conduction or cutoff can be precisely controlled at a set time point, thereby realizing the supply or stop of power to the load.

[0091] The power coupling network (i.e., the high-voltage rectifier and regulated power supply circuit system described above) in this application includes a main voltage source that outputs a target voltage and a clamping voltage source that outputs a voltage slightly lower than the target voltage. The two voltage sources are isolated from each other through their respective IGBT transistor switches and converge at the DC bus junction onto the power bus. Power is then supplied to the load terminal according to a planned schedule via a load inductor. This dual-power-bus network configuration provides a stable output voltage, reduces the switching frequency of the IGBT transistors, and lowers electromagnetic interference from the power system. Furthermore, the dual-power-bus configuration reduces the voltage difference between the collector and emitter of each IGBT transistor when the switch is turned off. With voltage variation rate This reduces voltage fluctuations on the power bus, lowers the voltage variation rate, significantly reduces device stress in IGBT transistors, extends device life, and lowers the rated specifications requirements for power devices.

[0092] Furthermore, the main voltage source injects electrical energy into the system. When the IGBT transistor is turned on, the electromagnetic energy stored in the load inductor, or the energy storage capacitor stored at the load end, provides power supplementation when the main voltage source IGBT transistor is turned off, reducing the IGBT transistor's on-time and lowering the equivalent impedance. This reduces heat loss and improves the efficiency of electricity use.

[0093] Please see Figures 5-6 , Figure 5 This is a timing diagram of the enable signal and the switching signal provided in an embodiment of this application. Figure 6 This is a timing diagram of the voltage and current of the power devices of the main voltage source provided in the embodiments of this application.

[0094] in, Indicates the moment when the auxiliary voltage source is turned on. Indicates the moment when the main / clamp voltage source is turned on. Indicates the turn-on time of the main voltage source IGBT. Indicates the turn-on time of the clamping voltage source IGBT. Indicates the moment when the main voltage source IGBT is turned off. This indicates the moment when the clamping voltage source IGBT is disconnected.

[0095] exist Figure 5 In the diagram, the horizontal axis represents time, measured in seconds (s), and the vertical axis shows "0" indicating a disconnected signal and "1" indicating a connected signal. Specifically, in... Figure 5 In the diagram, the first figure shows the switching signal of Q1 in the main switch circuit, the second figure shows the switching signal of Q3 in the clamp switch circuit, the third figure shows the turn-on signal of the auxiliary voltage source, and the fourth figure shows the turn-on signal of the main / clamp voltage source.

[0096] exist Figure 6 In the diagram, the horizontal axis represents time, with the unit being seconds (s); the first diagram shows Q1 in the main switch circuit. Trans-voltage signal, unit is volt (V); the second diagram is in the main switching circuit. The voltage signal of the capacitor is measured in volts (V); the third diagram shows Q1 in the main switching circuit. Current signal, unit is ampere (A); the fourth figure is the main switching circuit. The current signal of a capacitor is measured in amperes (A).

[0097] Figure 5 Mid-time point This is the time to turn on the 10KV auxiliary voltage source. After power-on, the capacitors in the pulse rectifier circuit ( Pre-charging is performed to gradually increase the DC bus voltage and reduce the instantaneous voltage difference between the collector and emitter of the IGBT transistors (Q1, Q2, Q3, Q4) when they are turned on. This is also reflected in... Figure 6 Mid-term ~ of The trend is decreasing. At the instant the IGBT transistor is turned on... This reduces stress and heat loss in IGBT transistor devices.

[0098] Figure 5 Mid-time point This is the power-on time of the main voltage source and clamping voltage source. Because the switching pulse signal controlling the IGBT switches of the main voltage source and clamping voltage source has not yet been activated, meaning the IGBT transistors have not yet turned on, there is no current at the emitter of the IGBT transistors. This is also reflected in Figure 6 Mid-term ~ of Numerical value.

[0099] Figure 5 Mid-time point This refers to the timing of the IGBT transistors (Q1, Q2) in the main voltage source being turned on, and initiating a periodic pulse sequence: the main voltage source turn-on pulse, which controls the switching state of the IGBT transistors. Each transistor turn-on pulse occurs at a corresponding time point. Pulling the potential low turns off the IGBT transistor. This corresponds to... Figure 6 In the middle, Q1 When the IGBT transistor is turned on ( The voltage then drops to the saturation voltage of the IGBT transistor until time point [unclear]. Transistor off, The voltage across the gate is effectively reduced to below 100V. (During the time period) ~ Current output Transistor off ( ) until the next transistor turn-on ( Current output It is 0.

[0100] Continue reading Figure 5 It also includes the switching signal diagram of the clamp voltage source IGBT transistors (Q3, Q4). It is worth noting that the dual voltage source configuration of the main voltage source and the clamp voltage source not only reduces the stress and heat loss of the IGBT transistor devices, but the interleaved configuration of the switching signals also makes the voltage supply at the load end more stable and helps to balance the output of the two voltage sources.

[0101] The main voltage source / clamping voltage source circuit has an energy storage capacitor connected in parallel with the IGBT transistor switch. When the transistor is turned on ( The voltage source not only outputs power to the load terminal through the load inductor (L1), but also simultaneously supplies power to the capacitor connected in parallel with it. Charging occurs when the transistor is off ( Discharge through a capacitor. Parallel capacitor. In this configuration, the load inductance (L1) and the parallel capacitor are connected at the instant the IGBT transistor is turned off. It can store electrical energy that was originally stored in the form of magnetic energy when it is released due to instantaneous changes in current, and can effectively absorb the switching of IGBT transistors, the rapid voltage changes of transistors, and stabilize the waveform of the output voltage.

[0102] Through the above description of the embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus necessary general-purpose hardware platforms, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solutions, in essence or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A high-voltage rectifier-regulator power supply circuit system, characterized by comprising: include: The main voltage source is used to provide the target output voltage; The main switching circuit is connected between the main voltage source and the DC bus to convert the target output voltage of the AC power into DC power; the DC bus is connected to the load. A clamping voltage source is used to provide a clamping voltage lower than the target output voltage; A clamping switch circuit is connected between the clamping voltage source and the DC bus to convert the AC clamping voltage into DC voltage. An auxiliary voltage source is connected to the DC bus; The control unit is configured to control the auxiliary voltage source to precharge the power devices in the circuit system before the main switch circuit and the clamping switch circuit are turned on; after the precharging is completed, the control unit supplies power to the load by controlling the alternating conduction of the main switch circuit and the clamping switch circuit.

2. The high-voltage rectifier and regulated power supply circuit system according to claim 1, characterized in that, In the main switching circuit and / or the clamping switching circuit, a buffer capacitor is connected in parallel across the two ends of the switching transistor. The buffer capacitor is used to reduce output voltage fluctuations when the corresponding switching transistor is turned on or off.

3. The high-voltage rectifier and regulated power supply circuit system according to claim 1, characterized in that, Before the switching transistor of the main switching circuit is turned off, the switching transistor of the clamping switching circuit is turned on. The on-time of the switching transistor of the main switching circuit and the on-time of the switching transistor of the clamping switching circuit partially overlap, so as to clamp the voltage of the DC bus using the clamping voltage. The difference between the target output voltage and the clamping voltage is less than a preset difference.

4. The high-voltage rectifier ballast circuitry of claim 2, wherein, The main switching circuit includes a first diode, a second diode, a first transistor, a second transistor, a first resistor, a second resistor, a first capacitor, and a second capacitor; The control terminals of the first transistor and the second transistor are used to receive the main voltage source start / stop pulses of the control unit; The anode of the first diode is connected to the anode of the main voltage source, the cathode of the first diode is connected to the first terminal of the first transistor, the first terminal of the first transistor is connected to the first terminal of the first resistor, the second terminal of the first resistor is connected to the first terminal of the first capacitor, the second terminal of the first capacitor is connected to the second terminal of the first transistor, and the second terminal of the first transistor is connected to the first terminal of the DC bus. The negative terminal of the second diode is connected to the negative terminal of the main voltage source, the positive terminal of the second diode is connected to the first terminal of the second transistor, the first terminal of the second transistor is connected to the first terminal of the second resistor, the second terminal of the second resistor is connected to the first terminal of the second capacitor, the second terminal of the second capacitor is connected to the second terminal of the second transistor, and the second terminal of the second transistor is connected to the second terminal of the DC bus.

5. The high-voltage rectifier ballast circuitry of claim 2, wherein, The clamping switch circuit includes a third diode, a fourth diode, a third transistor, a fourth transistor, a third resistor, a fourth resistor, a third capacitor, and a fourth capacitor; The control terminals of the third transistor and the fourth transistor are used to receive the clamping voltage source on / off pulses of the control unit. The positive terminal of the third diode is connected to the positive terminal of the clamping voltage source, the negative terminal of the third diode is connected to the first terminal of the third transistor, the first terminal of the third transistor is connected to the first terminal of the third resistor, the second terminal of the third resistor is connected to the first terminal of the third capacitor, the second terminal of the third capacitor is connected to the second terminal of the third transistor, and the second terminal of the third transistor is connected to the first terminal of the DC bus. The negative terminal of the fourth diode is connected to the negative terminal of the clamping voltage source, the positive terminal of the fourth diode is connected to the first terminal of the fourth transistor, the first terminal of the fourth transistor is connected to the first terminal of the fourth resistor, the second terminal of the fourth resistor is connected to the first terminal of the fourth capacitor, the second terminal of the fourth capacitor is connected to the second terminal of the fourth transistor, and the second terminal of the fourth transistor is connected to the second terminal of the DC bus.

6. The high-voltage rectifier ballast circuitry of claim 1, wherein, The auxiliary voltage provided by the auxiliary voltage source is AC power, and the high-voltage rectifier and regulated power supply circuit system also includes an auxiliary rectifier circuit, wherein the auxiliary rectifier circuit includes a fifth diode and a sixth diode; The positive terminal of the fifth diode is connected to the positive terminal of the auxiliary voltage source, and the negative terminal of the fifth diode is connected to the first end of the DC bus. The negative terminal of the sixth diode is connected to the negative terminal of the auxiliary voltage source, and the positive terminal of the sixth diode is connected to the second end of the DC bus.

7. The high-voltage rectifier ballast circuitry of claim 1, wherein, The DC bus is equipped with a first inductor, a seventh diode, and an eighth diode. The first end of the DC bus is connected to the first end of the first inductor, the second end of the first inductor is connected to the positive terminal of the seventh diode, and the negative terminal of the seventh diode is connected to the first end of the load. The second end of the DC bus is connected to the negative terminal of the eighth diode, and the positive terminal of the eighth diode is connected to the second end of the load.

8. The high-voltage rectifier ballast circuitry of claim 6, wherein, It also includes a second inductor, a third inductor, and a fourth inductor; The second inductor is connected between the positive terminal of the main voltage source and the main switching circuit; The third inductor is connected between the positive terminal of the clamping voltage source and the clamping switch circuit; The fourth inductor is connected between the positive terminal of the auxiliary voltage source and the fifth diode.

9. A control method of a high-voltage rectifier stabilized power supply, characterized by, Using the high-voltage rectifier and regulated power supply circuit system as described in any one of claims 1 to 8, the control method includes: The auxiliary voltage source is controlled to precharge the power devices in the circuit system; The main voltage source and the clamping voltage source are alternately switched on to provide output voltage to the load through the DC bus. The conduction time of the switching transistor in the main switching circuit and the conduction time of the switching transistor in the clamping switching circuit partially overlap to clamp the voltage fluctuations of the DC bus.

10. The control method of a high-voltage rectifier stabilized power supply according to claim 9, characterized by, Also includes: When the main switching circuit or the clamping switching circuit switches from on to off, a buffer capacitor connected in parallel across the switching transistor is used to reduce output voltage fluctuations.

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