Three-phase voltage adjustable power supply

Abstract

The invention is suitable for the technical field of power supply conversion, and provides a three-phase voltage adjustable power supply. The power supply comprises a three-phase four-wire system alternating current input end, a rectifying circuit, a BUCK circuit and an H-bridge circuit, the three-phase four-wire system alternating current comprises an A-phase alternating current, a B-phase alternating current and a C-phase alternating current; the input end of the rectifying circuit is respectively connected with an A-phase alternating current input end, a B-phase alternating current input end and a C-phase alternating current input end; the rectifying circuit is used for converting alternating current input by the three-path single-phase alternating current input end into three paths of direct current; the input end of the BUCK circuit is connected with the output end of the rectifying circuit; the BUCK circuit is used for adjusting three paths of direct current in a preset voltage range and outputting direct current voltage; the input end of the H-bridge circuit is connected with the output end of the BUCK circuit; the H-bridge circuit is used for controlling the polarity of the DC voltage and outputting a target voltage. According to the three-phase voltage adjustable power supply, the function of adjusting the magnitude and polarity of the output voltage is realized based on a three-phase input power supply device.

Description

Technical Field

[0001] The present application belongs to the field of power conversion technology, and in particular relates to a three-phase voltage-adjustable power supply. Background Art

[0002] In the field of power electronics, power supply equipment is widely used in industry, scientific research, and various electronic devices. Traditional power supply equipment typically adopts a single input and fixed output voltage design, which makes it difficult to meet the diverse voltage and polarity requirements under complex operating conditions.

[0003] While some adjustable voltage power supplies exist on the market, most rely on single-phase input and exhibit significant limitations in their voltage range and polarity switching capabilities. For example, single-phase input power supplies can easily cause grid harmonic pollution due to their low input power factor when handling high-power loads, impacting power supply efficiency and stability. Furthermore, existing power supply equipment often requires complex external circuitry or manual operation to implement voltage polarity switching, increasing equipment cost while reducing usability and reliability.

[0004] Therefore, developing a power supply device that can meet the requirements of high power, wide voltage regulation range and flexible polarity switching has become a technical problem that needs to be solved urgently in the industry. Summary of the Invention

[0005] In order to overcome the problems existing in the related art, an embodiment of the present application provides a three-phase voltage adjustable power supply, which is a power supply device based on a three-phase input and realizes the function of adjusting the output voltage size and polarity.

[0006] This application is achieved through the following technical solutions:

[0007] In a first aspect, an embodiment of the present application provides a three-phase voltage-adjustable power supply, comprising a three-phase four-wire AC input terminal, a rectifier circuit, a buck (step-down) circuit, and an H-bridge circuit;

[0008] The three-phase four-wire AC power is divided into three single-phase power lines; the three single-phase power input terminals include the A-phase AC input terminal, the B-phase AC input terminal, and the C-phase AC input terminal;

[0009] The input terminals of the rectifier circuit are connected to the A-phase AC input terminal, the B-phase AC input terminal, and the C-phase AC input terminal respectively; the rectifier circuit is used to convert the AC power input from the three single-phase AC input terminals into three DC power channels;

[0010] The input end of the BUCK circuit is connected to the output end of the rectifier circuit; the BUCK circuit is used to regulate three DC currents within a preset voltage range and output a DC voltage;

[0011] The input end of the H-bridge circuit is connected to the output end of the BUCK circuit; the H-bridge circuit is used to control the polarity of the DC voltage and output the target voltage.

[0012] In one embodiment, the rectifier circuit includes a first rectifier circuit, a second rectifier circuit, and a third rectifier circuit; the input end of the rectifier circuit includes an input end of the first rectifier circuit, an input end of the second rectifier circuit, and an input end of the third rectifier circuit;

[0013] The input end of the first rectifier circuit is connected to the A-phase AC power input end;

[0014] The input end of the second rectifier circuit is connected to the B-phase AC power input end;

[0015] An input end of the third rectifier circuit is connected to the C-phase AC power input end.

[0016] In one embodiment, the buck circuit includes a first buck circuit, a second buck circuit, and a third buck circuit; the input end of the buck circuit includes an input end of the first buck circuit, an input end of the second buck circuit, and an input end of the third buck circuit; the output end of the rectifier circuit includes an output end of the first rectifier circuit, an output end of the second rectifier circuit, and an output end of the third rectifier circuit;

[0017] The input end of the first BUCK circuit is connected to the output end of the first rectifier circuit;

[0018] The input end of the second BUCK circuit is connected to the output end of the second rectifier circuit;

[0019] An input end of the third BUCK circuit is connected to an output end of the third rectifier circuit.

[0020] In one embodiment, the first rectifier circuit, the second rectifier circuit, and the third rectifier circuit have the same circuit structure, and all adopt a full-wave rectifier structure;

[0021] The first rectifier circuit includes a first diode, a second diode, a third diode, and a fourth diode; the input end of the first rectifier circuit includes a first input end of the first rectifier circuit and a first ground end of the first rectifier circuit; the output end of the first rectifier circuit includes a first output end of the first rectifier circuit and a second output end of the first rectifier circuit;

[0022] The positive electrode of the first diode serves as the first input terminal of the first rectifier circuit; the positive electrode of the first diode is connected to the negative electrode of the second diode; the negative electrode of the first diode serves as the first output terminal of the first rectifier circuit; the negative electrode of the first diode is connected to the negative electrode of the third diode; the positive electrode of the second diode serves as the second output terminal of the first rectifier circuit; the positive electrode of the second diode is connected to the positive electrode of the fourth diode; the positive electrode of the third diode serves as the first ground terminal of the first rectifier circuit; and the positive electrode of the third diode is connected to the negative electrode of the fourth diode.

[0023] In one embodiment, the first BUCK circuit, the second BUCK circuit, and the third BUCK circuit have the same circuit structure; the output ends of the BUCK circuits include the output end of the first BUCK circuit, the output end of the second BUCK circuit, and the output end of the third BUCK circuit;

[0024] The first buck circuit includes a first capacitor, a second capacitor, a first switch tube, a thirteenth diode, and a first inductor; the input end of the first buck circuit includes a first input end of the first buck circuit and a second input end of the first buck circuit; the output end of the first buck circuit includes a first output end of the first buck circuit and a second output end of the first buck circuit;

[0025] The first end of the first capacitor serves as the first input end of the first buck circuit; the first end of the first capacitor is connected to the drain of the first switching tube; the second end of the first capacitor serves as the second input end of the first buck circuit; the second end of the second capacitor serves as the second output end of the first buck circuit; the second end of the first capacitor is respectively connected to the anode of the thirteenth diode and the second end of the second capacitor; the second end of the second capacitor is grounded; the source of the first switching tube is respectively connected to the cathode of the thirteenth diode and the first end of the first inductor; the first end of the second capacitor serves as the first output end of the first buck circuit; and the second end of the first inductor is connected to the first end of the second capacitor.

[0026] In one embodiment, the input end of the H-bridge circuit includes a first input end of the H-bridge circuit and a second input end of the H-bridge circuit; the output end of the H-bridge circuit includes a first output end of the H-bridge circuit and a second output end of the H-bridge circuit;

[0027] The first output end of the first buck circuit, the first output end of the second buck circuit, and the first output end of the third buck circuit are all connected to the first input end of the H-bridge circuit; the second output end of the first buck circuit, the second output end of the second buck circuit, and the second output end of the third buck circuit are all connected to the second input end of the H-bridge circuit.

[0028] In one embodiment, the H-bridge circuit includes a seventh capacitor, a fourth switch tube, a fifth switch tube, a sixth switch tube, and a seventh switch tube;

[0029] The drain of the sixth switching tube serves as the first input end of the H-bridge circuit; the drain of the sixth switching tube is connected to the drain of the fourth switching tube; the source of the seventh switching tube serves as the second input end of the H-bridge circuit; the source of the seventh switching tube is connected to the source of the fifth switching tube; the first end of the seventh capacitor serves as the first output end of the H-bridge circuit; the source of the sixth switching tube and the drain of the seventh switching tube are both connected to the first end of the seventh capacitor; the second end of the seventh capacitor serves as the second output end of the H-bridge circuit; the source of the fourth switching tube and the drain of the fifth switching tube are both connected to the second end of the seventh capacitor.

[0030] In one embodiment, when the sixth switch tube and the fifth switch tube are turned on, and the fourth switch tube and the seventh switch tube are turned off, the target voltage output by the H-bridge circuit is a positive voltage;

[0031] When the fourth switch tube and the seventh switch tube are turned on, and the sixth switch tube and the fifth switch tube are turned off, the target voltage output by the H-bridge circuit is a negative voltage.

[0032] In one embodiment, when the target voltage output by the H-bridge circuit is a positive voltage, current flows into the first terminal of the seventh capacitor and flows out from the second terminal of the seventh capacitor; when the target voltage output by the H-bridge circuit is a negative voltage, current flows into the second terminal of the seventh capacitor and flows out from the first terminal of the seventh capacitor.

[0033] In one embodiment, the preset voltage range is 80V to 200V.

[0034] Compared with the prior art, the embodiments of the present application have the following beneficial effects:

[0035] In an embodiment of the present application, in response to the shortcomings of existing power supply equipment, a power supply based on three-phase input is proposed. By adopting a three-phase four-wire AC input and combining the coordinated work of a rectifier circuit, a BUCK circuit and an H-bridge circuit, the input three-phase AC is efficiently converted into an adjustable DC voltage, and the positive and negative polarity switching of the output voltage is achieved through the H-bridge circuit. This not only broadens the voltage regulation range, but also improves the power factor and efficiency of the power supply through the bridge rectifier and the division of the three-phase four-wire AC into three single-phase currents for current equalization control. At the same time, it simplifies the polarity switching operation, significantly improves the applicability and flexibility of the power supply equipment, and meets the diverse needs of modern complex loads for power supply equipment.

[0036] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0038] Figure 1 This is a circuit diagram of a three-phase voltage-adjustable power supply provided in one embodiment of the present application;

[0039] Figure 2 1 is a circuit diagram of a positive target voltage provided by an embodiment of the present application;

[0040] Figure 3 2 is a circuit diagram in which the target voltage is a negative voltage according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration rather than limitation to facilitate a thorough understanding of the embodiments of the present application. However, it will be apparent to those skilled in the art that the present application may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present application with unnecessary detail.

[0042] It should be understood that when used in the present specification and the appended claims, the term "comprising" indicates the presence of described features, integers, steps, operations, elements and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0043] It will also be understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0044] As used in this specification and the appended claims, the term "if" can be interpreted as "when" or "upon" or "in response to determining" or "in response to detecting," depending on the context. Similarly, the phrase "if it is determined" or "if [described condition or event] is detected" can be interpreted as meaning "upon determination" or "in response to determining" or "upon detection of [described condition or event]" or "in response to detecting [described condition or event]," depending on the context.

[0045] In addition, in the description of the present application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0046] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0047] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0048] Figure 1 This is a flow chart of a three-phase voltage adjustable power supply provided by an embodiment of the present application, referring to Figure 1 , the three-phase voltage adjustable power supply is described in detail as follows:

[0049] An embodiment of the present application provides a three-phase voltage-adjustable power supply, comprising: a three-phase four-wire AC power input terminal, a rectifier circuit, a BUCK circuit and an H-bridge circuit.

[0050] The three-phase four-wire AC power is divided into three single-phase power lines; the input terminals of the three single-phase power lines include an A-phase AC power input terminal, a B-phase AC power input terminal, and a C-phase AC power input terminal.

[0051] For example, the AC power input to the three-phase four-wire AC input terminal is an industrial voltage, generally 690V, and the voltage of each single-phase AC power line where the A-phase AC input terminal, the B-phase AC input terminal and the C-phase AC input terminal are located is 398V. In addition, the three-phase four-wire AC input terminal also includes a ground terminal.

[0052] The input ends of the rectifier circuit are respectively connected to the A-phase AC input end, the B-phase AC input end and the C-phase AC input end; the rectifier circuit is used to convert the AC power input from the three single-phase AC input ends into three DC powers.

[0053] For example, the rectifier circuit rectifies the three input single-phase power into 563V DC power. This splits the input three-phase power into three single-phase power circuits, reducing the voltage and current in each circuit and simplifying the difficulty of device selection.

[0054] The input end of the BUCK circuit is connected to the output end of the rectifier circuit; the BUCK circuit is used to regulate three-way DC power within a preset voltage range and output a DC voltage.

[0055] For example, the BUCK circuit reduces the DC power Vin to a DC voltage Vo, which can be adjusted within a preset voltage range according to demand, wherein the preset voltage range can be 80V to 200V.

[0056] The input end of the H-bridge circuit is connected to the output end of the BUCK circuit; the H-bridge circuit is used to control the polarity of the DC voltage and output the target voltage.

[0057] Exemplarily, the H-bridge circuit controls the polarity of the output target voltages Vo1 and Vo2 .

[0058] This embodiment addresses the shortcomings of existing power supply equipment. By adopting a three-phase four-wire AC input and combining the coordinated work of a rectifier circuit, a buck circuit, and an H-bridge circuit, the input three-phase AC power is efficiently converted into an adjustable DC voltage, and the positive and negative polarity switching of the output voltage is achieved through the H-bridge circuit. This not only broadens the voltage regulation range, but also improves the power factor and efficiency of the power supply through the bridge rectifier and the division of the three-phase four-wire AC power into three single-phase currents for current equalization control. At the same time, it simplifies the polarity switching operation, significantly enhances the applicability and flexibility of the power supply equipment, and meets the diverse requirements of modern complex loads for power supply equipment.

[0059] In addition, the present invention aims to develop a power supply device that can meet the requirements of high power, wide voltage adjustment range and flexible polarity switching, and the power supply field of hull demagnetization is used as an example to illustrate.

[0060] Existing degaussing power systems for shipboard degaussing have shortcomings in cost, size, and reliability. Modern ships are complex, large ferromagnetic structures. Due to the influence of geomagnetism, magnetic field shocks during construction and navigation, and stress shocks, magnetic fields are generated in the air around the ships, posing a significant threat to magnetic detection and magnetic weapon attacks. Therefore, degaussing systems are necessary to improve ship protection.

[0061] In the field of ship hull demagnetization, the demagnetization power supply is the most crucial component of the system. Following the instructions of the demagnetization control device, it outputs high-quality demagnetization current to the demagnetization coil, thereby counteracting the ship's own magnetic field and enhancing the ship's magnetic stealth. To improve the overall efficiency of the demagnetization power supply and obtain highly accurate positive and negative output currents, the demagnetization power supply must provide high-precision positive and negative output currents to meet the requirements of ship demagnetization. To address these challenges, the power supply architecture proposed in this paper uses three-phase, four-wire AC input, converts it to DC via a rectifier circuit, then regulates the voltage via a buck circuit. Finally, an H-bridge circuit controls the output voltage polarity, resulting in a power supply output that is adjustable within a preset voltage range and features polarity switching. This design provides flexible voltage and polarity control for the demagnetization system to accommodate diverse demagnetization requirements. Furthermore, optimized circuit design can improve the power factor and harmonic control of the power supply, reducing energy waste and improving efficiency. This is particularly important for high-power demagnetization systems, as it reduces heat dissipation, device size, and cost, while also improving system reliability and performance.

[0062] Next, the specific structures of the rectifier circuit, buck circuit and H-bridge circuit are introduced respectively.

[0063] In one embodiment, the specific circuit structure of the rectifier circuit is described. The rectifier circuit includes a first rectifier circuit, a second rectifier circuit, and a third rectifier circuit. The input ends of the rectifier circuit include the input end of the first rectifier circuit, the input end of the second rectifier circuit, and the input end of the third rectifier circuit. The output ends of the rectifier circuit include the output end of the first rectifier circuit, the output end of the second rectifier circuit, and the output end of the third rectifier circuit.

[0064] The input end of the first rectifier circuit is connected to the A-phase AC input end; the input end of the second rectifier circuit is connected to the B-phase AC input end; the input end of the third rectifier circuit is connected to the C-phase AC input end.

[0065] Exemplarily, the first rectifier circuit, the second rectifier circuit, and the third rectifier circuit have the same circuit structure, all employing a full-wave rectifier structure. The input end of the first rectifier circuit includes the first input end of the first rectifier circuit and the first ground end of the first rectifier circuit; the input end of the second rectifier circuit includes the first input end of the second rectifier circuit and the first ground end of the second rectifier circuit; the input end of the second rectifier circuit includes the first input end of the second rectifier circuit and the first ground end of the second rectifier circuit; the first ground end of the first rectifier circuit, the first ground end of the first rectifier circuit, and the first ground end of the first rectifier circuit are all connected to the ground wire of the three-phase four-wire AC input end.

[0066] The first rectifier circuit includes a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4; the output end of the first rectifier circuit includes a first output end of the first rectifier circuit and a second output end of the first rectifier circuit.

[0067] The anode of the first diode D1 serves as the first input terminal of the first rectifier circuit; the anode of the first diode D1 is connected to the cathode of the second diode D2; the cathode of the first diode D1 serves as the first output terminal of the first rectifier circuit; the cathode of the first diode D1 is connected to the cathode of the third diode D3; the anode of the second diode D2 serves as the second output terminal of the first rectifier circuit; the anode of the second diode D2 is connected to the anode of the fourth diode D4; the anode of the third diode D3 serves as the first ground terminal of the first rectifier circuit; and the anode of the third diode D3 is connected to the cathode of the fourth diode D4.

[0068] Exemplarily, the second rectifier circuit includes a fifth diode D5, a sixth diode D6, a seventh diode D7 and an eighth diode D8; the output end of the second rectifier circuit includes a first output end of the second rectifier circuit and a second output end of the second rectifier circuit.

[0069] The anode of the fifth diode D5 serves as the first input terminal of the second rectifier circuit; the anode of the fifth diode D5 is respectively connected to the cathode of the sixth diode D6; the cathode of the fifth diode D5 serves as the first output terminal of the second rectifier circuit; the cathode of the fifth diode D5 is connected to the cathode of the seventh diode D7; the anode of the sixth diode D6 serves as the second output terminal of the second rectifier circuit; the anode of the sixth diode D6 is connected to the anode of the eighth diode D8; the anode of the seventh diode D7 serves as the first ground terminal of the second rectifier circuit; and the anode of the seventh diode D7 is connected to the cathode of the eighth diode D8.

[0070] Exemplarily, the third rectifier circuit includes a ninth diode D9, a tenth diode D10, an eleventh diode D11, and a twelfth diode D10; the output end of the third rectifier circuit includes a first output end of the third rectifier circuit and a second output end of the third rectifier circuit.

[0071] The anode of the ninth diode D9 serves as the first input terminal of the third rectifier circuit; the anode of the ninth diode D9 is respectively connected to the cathode of the tenth diode D10; the cathode of the ninth diode D9 serves as the first output terminal of the third rectifier circuit; the cathode of the ninth diode D9 is connected to the cathode of the eleventh diode D11; the anode of the tenth diode D10 serves as the second output terminal of the third rectifier circuit; the anode of the tenth diode D10 is connected to the anode of the twelfth diode D12; the anode of the eleventh diode D11 serves as the first ground terminal of the third rectifier circuit; and the anode of the eleventh diode D11 is connected to the cathode of the twelfth diode D12.

[0072] The rectifier circuit of this embodiment utilizes multiple rectifier circuits, each connected to a phase of three-phase AC power. This effectively converts the three-phase AC power into DC power, improving the efficiency of power conversion. Because three-phase AC power inherently has characteristics such as stable phase differences, this rectifier circuit structure fully utilizes the energy of the three-phase power and reduces energy loss.

[0073] Each rectifier circuit uses a full-wave rectification structure. Compared to a half-wave rectification structure, full-wave rectification can rectify the current throughout a complete AC cycle, making the output DC voltage smoother and more stable. This provides a more stable DC power supply for subsequent circuits and reduces the adverse effects of voltage fluctuations on other circuit components.

[0074] The diode connections in each rectifier circuit are clearly and rationally arranged. Taking the first rectifier circuit as an example, the interconnected structure of four diodes ensures that the current is rectified in the correct direction, accurately converting AC power into DC power. This structure is simple, reliable, and easy to implement, while also facilitating circuit troubleshooting and maintenance. If a diode fails, the fault point can be quickly identified and repaired based on its connection within the circuit.

[0075] In one embodiment, a specific circuit structure of a buck circuit is described. The buck circuit includes a first buck circuit, a second buck circuit, and a third buck circuit. The input ends of the buck circuit include the input end of the first buck circuit, the input end of the second buck circuit, and the input end of the third buck circuit.

[0076] The input end of the first BUCK circuit is connected to the output end of the first rectifier circuit; the input end of the second BUCK circuit is connected to the output end of the second rectifier circuit; the input end of the third BUCK circuit is connected to the output end of the third rectifier circuit.

[0077] Exemplarily, the first BUCK circuit, the second BUCK circuit, and the third BUCK circuit have the same circuit structure; the output ends of the BUCK circuits include the output end of the first BUCK circuit, the output end of the second BUCK circuit, and the output end of the third BUCK circuit.

[0078] The first buck circuit includes a first capacitor C1, a second capacitor C2, a first switch tube V1, a thirteenth diode D13, and a first inductor L1; the input end of the first buck circuit includes a first input end of the first buck circuit and a second input end of the first buck circuit; the output end of the first buck circuit includes a first output end of the first buck circuit and a second output end of the first buck circuit.

[0079] The first end of the first capacitor C1 serves as the first input end of the first buck circuit; the first end of the first capacitor C1 is connected to the drain of the first switching tube V1; the second end of the first capacitor C1 serves as the second input end of the first buck circuit; the second end of the second capacitor C2 serves as the second output end of the first buck circuit; the second end of the first capacitor C1 is respectively connected to the anode of the thirteenth diode D13 and the second end of the second capacitor C2; the second end of the second capacitor C2 is grounded; the source of the first switching tube V1 is respectively connected to the cathode of the thirteenth diode D13 and the first end of the first inductor L1; the first end of the second capacitor C2 serves as the first output end of the first buck circuit; and the second end of the first inductor L1 is connected to the first end of the second capacitor C2.

[0080] Exemplarily, the second buck circuit includes a third capacitor C3, a fourth capacitor C4, a second switch tube V2, a fourteenth diode D14, and a second inductor L2; the input end of the second buck circuit includes a first input end of the second buck circuit and a second input end of the second buck circuit; the output end of the second buck circuit includes a first output end of the second buck circuit and a second output end of the second buck circuit;

[0081] The first end of the third capacitor C3 serves as the first input end of the second buck circuit; the first end of the third capacitor C3 is connected to the drain of the second switch tube V2; the second end of the third capacitor C3 serves as the second input end of the second buck circuit; the second end of the fourth capacitor C4 serves as the second output end of the second buck circuit; the second end of the third capacitor C3 is respectively connected to the anode of the fourteenth diode D14 and the second end of the fourth capacitor C4; the second end of the fourth capacitor C4 is grounded; the source of the second switch tube V2 is respectively connected to the cathode of the fourteenth diode D14 and the first end of the second inductor L2; the first end of the fourth capacitor C4 serves as the first output end of the second buck circuit; the second end of the second inductor L2 is connected to the first end of the fourth capacitor C4.

[0082] Exemplarily, the third buck circuit includes a fifth capacitor C5, a sixth capacitor C6, a third switch tube V3, a fifteenth diode D15, and a third inductor L3; the input end of the third buck circuit includes a first input end of the third buck circuit and a second input end of the third buck circuit; the output end of the third buck circuit includes a first output end of the third buck circuit and a second output end of the third buck circuit.

[0083] The first end of the fifth capacitor C5 serves as the first input end of the third buck circuit; the first end of the fifth capacitor C5 is connected to the drain of the third switch tube V3; the second end of the fifth capacitor C5 serves as the second input end of the third buck circuit; the second end of the sixth capacitor C6 serves as the second output end of the third buck circuit; the second end of the fifth capacitor C5 is respectively connected to the anode of the fifteenth diode D15 and the second end of the sixth capacitor C6; the second end of the sixth capacitor C6 is grounded; the source of the third switch tube V3 is respectively connected to the cathode of the fifteenth diode D15 and the first end of the third inductor L3; the first end of the sixth capacitor C6 serves as the first output end of the third buck circuit; and the second end of the third inductor L3 is connected to the first end of the sixth capacitor C6.

[0084] This embodiment employs three identical buck circuits (a first buck circuit, a second buck circuit, and a third buck circuit) connected to the output terminals of corresponding rectifier circuits, enabling efficient distribution and management of input energy. Each buck circuit independently steps down the input voltage, enhancing the overall circuit's flexibility.

[0085] The unique combination of circuit components within each BUCK circuit also brings specific advantages. Taking the first BUCK circuit as an example, the setting of the first capacitor C1 and the second capacitor C2 helps to stabilize the voltage in the circuit. The coordinated work between the first switch tube V1, the thirteenth diode D13 and the first inductor L1 can efficiently convert the input voltage into the desired output voltage. The two ends of the first capacitor C1 serve as the two input ends of the first BUCK circuit, which can effectively receive the input signal and realize preliminary processing of the input signal through connection with other components. The first switch tube V1 acts as a control element and can adjust the on and off states according to the circuit requirements, thereby accurately controlling the direction and magnitude of the current in the circuit. The thirteenth diode D13 plays a freewheeling role, ensuring that the current in the circuit can continue to flow during the off period of the switch tube, avoiding damage to the circuit caused by sudden changes in current. The first inductor L1 further plays the role of storing and releasing energy during the energy conversion process, and works together with the capacitor to smooth the output voltage.

[0086] Similarly, the second and third buck circuits also have similar beneficial effects. The third capacitor C3, fourth capacitor C4, second switch V2, fourteenth diode D14, and second inductor L2 in the second buck circuit, as well as the fifth capacitor C5, sixth capacitor C6, third switch V3, fifteenth diode D15, and third inductor L3 in the third buck circuit, all perform voltage stabilization, current control, freewheeling, and energy conversion and storage functions according to their respective connection configurations.

[0087] Overall, this buck circuit structure can effectively reduce voltage fluctuations and improve output voltage stability during the voltage conversion process. Its modular design (three buck circuits with identical structures) greatly facilitates circuit maintenance, upgrades, and troubleshooting, and can adapt to a variety of different operating scenarios and load requirements.

[0088] In one embodiment, a specific circuit structure of an H-bridge circuit is described. The input end of the H-bridge circuit includes a first input end of the H-bridge circuit and a second input end of the H-bridge circuit; the output end of the H-bridge circuit includes a first output end of the H-bridge circuit and a second output end of the H-bridge circuit.

[0089] The first output end of the first buck circuit, the first output end of the second buck circuit, and the first output end of the third buck circuit are all connected to the first input end of the H-bridge circuit; the second output end of the first buck circuit, the second output end of the second buck circuit, and the second output end of the third buck circuit are all connected to the second input end of the H-bridge circuit.

[0090] Exemplarily, the H-bridge circuit includes a seventh capacitor C7, a fourth switch tube V4, a fifth switch tube V5, a sixth switch tube V6, and a seventh switch tube V7.

[0091] The drain of the sixth switching tube V6 serves as the first input terminal of the H-bridge circuit; the drain of the sixth switching tube V6 is connected to the drain of the fourth switching tube V4; the source of the seventh switching tube V7 serves as the second input terminal of the H-bridge circuit; the source of the seventh switching tube V7 is connected to the source of the fifth switching tube V5; the first terminal of the seventh capacitor C7 serves as the first output terminal of the H-bridge circuit; the source of the sixth switching tube V6 and the drain of the seventh switching tube V7 are both connected to the first terminal of the seventh capacitor C7; the second terminal of the seventh capacitor C7 serves as the second output terminal of the H-bridge circuit; the source of the fourth switching tube V4 and the drain of the fifth switching tube V5 are both connected to the second terminal of the seventh capacitor C7.

[0092] For example, when the sixth switch tube V6 and the fifth switch tube V5 are turned on, and the fourth switch tube V4 and the seventh switch tube V7 are turned off, the target voltages Vo1 and Vo2 output by the H-bridge circuit are positive voltages, such as Figure 2 shown.

[0093] When the fourth switch tube V4 and the seventh switch tube V7 are turned on, and the sixth switch tube V6 and the fifth switch tube V5 are turned off, the target voltages Vo1 and Vo2 output by the H-bridge circuit are negative voltages. Figure 3 shown.

[0094] Exemplarily, when the target voltage output by the H-bridge circuit is a positive voltage, current flows into the first end of the seventh capacitor C7 and flows out from the second end of the seventh capacitor C7; when the target voltage output by the H-bridge circuit is a negative voltage, current flows into the second end of the seventh capacitor C7 and flows out from the first end of the seventh capacitor C7.

[0095] This embodiment, through the combination of turning on and off different switching transistors, can flexibly output positive and negative voltages. This feature makes it widely applicable in a variety of application scenarios requiring voltages of different polarities. Secondly, the output terminals of multiple buck circuits are connected to the input terminals of the H-bridge circuit. This connection method helps integrate different input signals, improving the overall circuit integration and signal processing efficiency. Furthermore, the capacitors in the circuit play a role in stabilizing the voltage during the voltage output process, making the output target voltage more stable and reliable, reducing the impact of voltage fluctuations on subsequent circuits or equipment, and thus improving the performance stability of the entire circuit system.

[0096] It can be seen that the three-phase voltage-adjustable power supply proposed in the present invention adopts three-phase four-wire AC input and combines the coordinated work of the rectifier circuit, the BUCK circuit and the H-bridge circuit to efficiently convert the input three-phase AC into an adjustable DC voltage, and realizes the positive and negative polarity switching of the output voltage through the H-bridge circuit. It not only broadens the voltage adjustment range, but also improves the power factor and efficiency of the power supply through the bridge rectifier and the three-phase four-wire AC is divided into three single-phase currents for current equalization control. At the same time, it simplifies the polarity switching operation, significantly improves the applicability and flexibility of the power supply equipment, and meets the diverse needs of modern complex loads for power supply equipment.

[0097] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0098] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A three-phase voltage adjustable power supply, characterized in that: It includes a three-phase four-wire AC input terminal, a rectifier circuit, a BUCK circuit and an H-bridge circuit; The three-phase four-wire AC power is divided into three single-phase power input terminals, wherein the input terminals of the three single-phase power input terminals include an A-phase AC power input terminal, a B-phase AC power input terminal, and a C-phase AC power input terminal. The input end of the rectifier circuit is connected to the A-phase AC input end, the B-phase AC input end, and the C-phase AC input end respectively; the rectifier circuit is used to convert the AC power input from the three single-phase AC input ends into three DC powers; The input end of the BUCK circuit is connected to the output end of the rectifier circuit; the BUCK circuit is used to regulate three-way DC power within a preset voltage range and output a DC voltage; The input end of the H-bridge circuit is connected to the output end of the BUCK circuit; the H-bridge circuit is used to control the polarity of the DC voltage and output the target voltage.

2. The three-phase voltage adjustable power supply according to claim 1, characterized in that: The rectifier circuit includes a first rectifier circuit, a second rectifier circuit, and a third rectifier circuit; the input end of the rectifier circuit includes an input end of the first rectifier circuit, an input end of the second rectifier circuit, and an input end of the third rectifier circuit; The input end of the first rectifier circuit is connected to the A-phase AC power input end; The input end of the second rectifier circuit is connected to the B-phase AC power input end; The input end of the third rectifier circuit is connected to the C-phase AC power input end.

3. The three-phase voltage adjustable power supply according to claim 2, characterized in that: The buck circuit includes a first buck circuit, a second buck circuit, and a third buck circuit; the input end of the buck circuit includes the input end of the first buck circuit, the input end of the second buck circuit, and the input end of the third buck circuit; the output end of the rectifier circuit includes the output end of the first rectifier circuit, the output end of the second rectifier circuit, and the output end of the third rectifier circuit; The input end of the first BUCK circuit is connected to the output end of the first rectifier circuit; The input end of the second BUCK circuit is connected to the output end of the second rectifier circuit; An input end of the third BUCK circuit is connected to an output end of the third rectifier circuit.

4. The three-phase voltage adjustable power supply according to claim 3, characterized in that: The first rectifier circuit, the second rectifier circuit and the third rectifier circuit have the same circuit structure, and all adopt a full-wave rectifier structure; The first rectifier circuit includes a first diode, a second diode, a third diode, and a fourth diode; the input end of the first rectifier circuit includes a first input end of the first rectifier circuit and a first ground end of the first rectifier circuit; the output end of the first rectifier circuit includes a first output end of the first rectifier circuit and a second output end of the first rectifier circuit; The anode of the first diode serves as the first input end of the first rectifier circuit; the anode of the first diode is connected to the cathode of the second diode; the cathode of the first diode serves as the first output end of the first rectifier circuit; the cathode of the first diode is connected to the cathode of the third diode; the anode of the second diode serves as the second output end of the first rectifier circuit; the anode of the second diode is connected to the anode of the fourth diode; the anode of the third diode serves as the first ground end of the first rectifier circuit; and the anode of the third diode is connected to the cathode of the fourth diode.

5. The three-phase voltage adjustable power supply according to claim 4, characterized in that: The first buck circuit, the second buck circuit, and the third buck circuit have the same circuit structure; the output ends of the buck circuits include the output end of the first buck circuit, the output end of the second buck circuit, and the output end of the third buck circuit; The first buck circuit includes a first capacitor, a second capacitor, a first switch, a thirteenth diode, and a first inductor; the input end of the first buck circuit includes a first input end of the first buck circuit and a second input end of the first buck circuit; the output end of the first buck circuit includes a first output end of the first buck circuit and a second output end of the first buck circuit; The first end of the first capacitor serves as the first input end of the first buck circuit; the first end of the first capacitor is connected to the drain of the first switching tube; the second end of the first capacitor serves as the second input end of the first buck circuit; the second end of the second capacitor serves as the second output end of the first buck circuit; the second end of the first capacitor is respectively connected to the anode of the thirteenth diode and the second end of the second capacitor; the second end of the second capacitor is grounded; the source of the first switching tube is respectively connected to the cathode of the thirteenth diode and the first end of the first inductor; the first end of the second capacitor serves as the first output end of the first buck circuit; and the second end of the first inductor is connected to the first end of the second capacitor.

6. The three-phase voltage adjustable power supply according to claim 5, characterized in that: The input end of the H-bridge circuit includes a first input end of the H-bridge circuit and a second input end of the H-bridge circuit; the output end of the H-bridge circuit includes a first output end of the H-bridge circuit and a second output end of the H-bridge circuit; The first output end of the first buck circuit, the first output end of the second buck circuit, and the first output end of the third buck circuit are all connected to the first input end of the H-bridge circuit; the second output end of the first buck circuit, the second output end of the second buck circuit, and the second output end of the third buck circuit are all connected to the second input end of the H-bridge circuit.

7. The three-phase voltage adjustable power supply according to claim 6, characterized in that: The H-bridge circuit includes a seventh capacitor, a fourth switch tube, a fifth switch tube, a sixth switch tube and a seventh switch tube; The drain of the sixth switch tube serves as the first input end of the H-bridge circuit; the drain of the sixth switch tube is connected to the drain of the fourth switch tube; the source of the seventh switch tube serves as the second input end of the H-bridge circuit; the source of the seventh switch tube is connected to the source of the fifth switch tube; the first end of the seventh capacitor serves as the first output end of the H-bridge circuit; the source of the sixth switch tube and the drain of the seventh switch tube are both connected to the first end of the seventh capacitor; the second end of the seventh capacitor serves as the second output end of the H-bridge circuit; the source of the fourth switch tube and the drain of the fifth switch tube are both connected to the second end of the seventh capacitor.

8. The three-phase voltage adjustable power supply according to claim 7, characterized in that: When the sixth switch tube and the fifth switch tube are turned on, and the fourth switch tube and the seventh switch tube are turned off, the target voltage output by the H-bridge circuit is a positive voltage; When the fourth switch tube and the seventh switch tube are turned on, and the sixth switch tube and the fifth switch tube are turned off, the target voltage output by the H-bridge circuit is a negative voltage.

9. The three-phase voltage adjustable power supply according to claim 7, characterized in that: When the target voltage output by the H-bridge circuit is a positive voltage, current flows into the first end of the seventh capacitor and flows out from the second end of the seventh capacitor; when the target voltage output by the H-bridge circuit is a negative voltage, current flows into the second end of the seventh capacitor and flows out from the first end of the seventh capacitor.

10. The three-phase voltage adjustable power supply according to any one of claims 1 to 9, characterized in that: The preset voltage range is 80V to 200V.

Images