A high power modular power supply
By using a modular design and a high-efficiency topology power system, the problems of large size and low power density of high-power devices have been solved, resulting in a power system with high power density, high reliability, and adaptability to various application scenarios, while reducing maintenance costs.
Patent Information
- Application Number
- CN202522146018.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-10
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-10
AI Technical Summary
Existing high-power equipment suffers from problems such as large size, low power density, high cost, and long development cycle. Furthermore, traditional test power supplies are unable to handle both high voltage and high current output, making them unsuitable for various application scenarios.
Adopting a modular design, the AC-DC unit is connected to the main control system via a bus, and the DC-AC unit is connected via a ring interface. Combined with a three-phase PWM rectifier circuit, a CLLC circuit, and an H-bridge inverter circuit, it enables flexible combination of modular power supplies and autonomous fault exit, adapting to different power demand scenarios.
It achieves high power density, small size, high reliability, and strong stability, can adapt to a variety of application scenarios, and is easy to maintain, reducing maintenance costs.
Smart Images
Figure CN224684124U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power electronics technology, specifically to a high-power modular power supply. Background Technology
[0002] Currently, the power electronics industry is pursuing better performance indicators: higher power density and greater output power. However, because high-power equipment currently mainly adopts an integrated design with IGBT-based main control, it suffers from problems such as large size, low power density, high cost, and long development cycles, increasing the difficulty of equipment development. Furthermore, the failure of a single unit can paralyze the entire project, resulting in significant limitations.
[0003] Meanwhile, due to the increasing power consumption in the PCS and inverter charging pile industries, the requirements for test power supplies have also changed. PCS requires higher voltage levels, but traditional centralized inverters and charging piles require lower voltage levels, while also requiring larger circuit output currents. Traditional test power supplies generally struggle to balance high output voltage and high output current, making them unsuitable for various application scenarios. Utility Model Content
[0004] The technical problem to be solved by this utility model is how to provide a power supply with high power density, modularity and adaptability to various application scenarios.
[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a high-power modular power supply, including a main control system, several AC-DC units and several DC-AC units, wherein one AC-DC unit and one DC-AC unit are interlocked at nodes, each AC-DC unit is connected to the main control system via a bus, the DC-AC units are connected in pairs, and each DC-AC unit is connected to the main control system; the AC-DC unit and the DC-AC unit include a three-phase PWM rectifier circuit, a CLLC circuit and an H-bridge inverter circuit, which are connected in sequence.
[0006] This invention connects each AC-DC unit to the main control unit via a bus to upload status and fault information, simplifying the communication architecture and reducing wiring complexity. The DC-AC units are connected in pairs, with each unit connected to the main control system via a ring interface to upload commands and instructions. If any AC-DC or DC-AC unit malfunctions, it can autonomously exit the system without affecting other units, ensuring short-term derating. This modular design reduces size while increasing power density. Furthermore, the flexible combination of AC-DC and DC-AC units allows for elastic power expansion, adapting to different power requirements.
[0007] Meanwhile, maintenance only requires replacing the faulty unit, which can significantly improve the reliability and stability of the entire system and reduce maintenance costs;
[0008] Furthermore, this invention utilizes a cascaded design of three-phase PWM rectification + CLLC + H-bridge to achieve efficient rectification, isolation conversion, and inverter output, thereby improving overall efficiency.
[0009] Preferably, the three-phase PWM rectifier circuit includes inductors L1 to L3 and switching transistors Q1 to Q6. Switches Q1 and Q2 are connected in series to form phase A bridge arm. One end of inductor L1 is connected to the input AC power A, and the other end is connected to phase A bridge arm. The connection point is located between switching transistors Q1 and Q2. Switches Q3 and Q4 are connected in series to form phase B bridge arm. One end of inductor L2 is connected to the input AC power B, and the other end is connected to phase B bridge arm. The connection point is located between switching transistors Q3 and Q4. Switches Q5 and Q6 are connected in series to form phase C bridge arm. One end of inductor L3 is connected to the input AC power C, and the other end is connected to phase C bridge arm. The connection point is located between switching transistors Q5 and Q6. The phase A, phase B, and phase C bridge arms are connected in parallel.
[0010] This utility model adopts a typical three-phase bridge arm structure to achieve high power factor correction, which can adapt to the needs of industrial power grids. Each phase bridge arm is independent and connected in parallel, which can balance the current distribution and improve stability.
[0011] Preferably, the three-phase PWM rectifier circuit further includes capacitors C1 to C3. One end of capacitors C1, C2, and C3 is connected to the other end of capacitor C1, which is connected to the inductor L1 and the input AC power A. The other end of capacitor C2 is connected to the inductor L2 and the input AC power B. The other end of capacitor C3 is connected to the inductor L3 and the input AC power C.
[0012] Capacitors C1 to C3 and inductors L1 to L3 form an LC filter network, which can effectively suppress high-frequency noise from the mains power supply and protect subsequent circuits.
[0013] Preferably, the CLLC circuit includes switching transistors Q7 to Q10, inductor L4, capacitor C4, and transformer T1. The series-connected switching transistors Q7 and Q8 are connected in parallel with the series-connected switching transistors Q9 and Q10. The two ends of the parallel connection are connected to the two ends of the series-connected Q5 and Q6. One end of inductor L4 is connected to the end where switching transistors Q7 and Q8 are connected, and the other end of inductor L4 is connected to one end of capacitor C4. The other end of capacitor C4 is connected to one end of the primary winding of transformer T1, and the other end of the primary winding of transformer T1 is connected to the end where switching transistors Q9 and Q10 are connected.
[0014] Preferably, the transformer T1 includes a first secondary winding and a second secondary winding.
[0015] This invention employs a double secondary winding, which improves the flexibility of power distribution.
[0016] Preferably, the CLLC circuit further includes switching transistors Q11 to Q14, inductor L5, capacitor C5, and the series-connected switching transistors Q11 and Q12 are connected in parallel with the series-connected switching transistors Q13 and Q14. One end of inductor L5 is connected to one end of the first secondary winding of transformer T1, and the other end of inductor L5 is connected to one end of capacitor C5. The other end of capacitor C5 is connected to the end where switching transistors Q11 and Q12 are connected, and the other end of the first secondary winding of transformer T1 is connected to the end where switching transistors Q13 and Q14 are connected.
[0017] Preferably, the CLLC circuit further includes switching transistors Q15 to Q18, inductor L10, capacitor C10, series-connected switching transistors Q15 and Q16 connected in parallel with series-connected switching transistors Q17 and Q18, one end of inductor L10 connected to one end of the second secondary winding of transformer T1, the other end of inductor L10 connected to one end of capacitor C10, the other end of capacitor C10 connected to the end where switching transistors Q15 and Q16 are connected, and the other end of the second secondary winding of transformer T1 connected to the end where switching transistors Q17 and Q18 are connected.
[0018] Preferably, the H-bridge inverter circuit includes switches Q19 to Q26. Switches Q19 and Q20 are connected in parallel with series-connected switches Q21 and Q22, and their two ends are connected to the two ends of series-connected switches Q13 and Q14. Series-connected switches Q23 and Q24 are connected in parallel with series-connected switches Q25 and Q26, and their two ends are connected to the two ends of series-connected switches Q17 and Q18.
[0019] Preferably, the H-bridge inverter circuit further includes inductors L6 to L9 and switches K1 to K3. One end of inductor L8 is connected to the end where switches Q23 and Q24 are connected, and the other end of inductor L8 is connected to one end of switch K1. The other end of switch K1 is connected to one end of inductor L6. The other end of inductor L6 is connected to the end where switches Q19 and Q20 are connected. The other end of inductor L8 is also connected to one end of switch K2. The other end of switch K2 is connected to one end of inductor L7. The other end of inductor L7 is connected to the end where switches Q21 and Q22 are connected. One end of inductor L9 is connected to the end where switches Q25 and Q26 are connected, and the other end of inductor L9 is connected to one end of switch K3. The other end of switch K3 is connected to the end where inductor L7 and switch K2 are connected.
[0020] Switches K1 to K3 enable dynamic switching of the output path. When the user operates high-voltage equipment, K2 is closed, and K1 and K3 are open. Inductors L7 and L8 are connected in series, resulting in a series output capable of delivering high DC and AC power. When the system requires low voltage and high current, K2 is open, and K1 and K3 are closed. The dual H4 bridges are connected in an interleaved parallel configuration, achieving low voltage and high current. Therefore, this invention, through the H4 bridge configuration, enables four-quadrant power operation and can output both DC and AC power, making it suitable for various scenarios.
[0021] Preferably, the H-bridge inverter circuit further includes an output capacitor, one end of which is connected to the end where inductor L6 is connected to switch K1, and the other end of which is connected to the end where inductor L9 is connected to switch K3.
[0022] Compared with existing technologies, the advantages of this utility model are: through a modular architecture and efficient topology, namely a three-phase PWM rectifier circuit, a CLLC circuit and an H-bridge inverter circuit, it provides a power supply system that is small in size, high in power density, high in reliability, simple in hardware, and applicable to a variety of different scenarios, especially suitable for industrial-grade high-power scenarios. Attached Figure Description
[0023] Figure 1 This is a diagram illustrating the composition of the modular power supply according to an embodiment of the present invention.
[0024] Figure 2 This is a circuit topology diagram of the AC-DC / DC-AC unit in an embodiment of this utility model. Detailed Implementation
[0025] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0026] Example
[0027] like Figure 1As shown, this embodiment provides a high-power modular power supply, including a main control system, several AC-DC units, and several DC-AC units. In this embodiment, there are two AC-DC units and two DC-AC units. In other embodiments, the number of each unit is not limited to two. One AC-DC unit and one DC-AC unit implement node interlocking. Each AC-DC unit is connected to the main control system via a bus to upload status and fault information. The DC-AC units are connected in pairs, and each DC-AC unit is connected to the main control system, i.e., using a ring interface to upload instructions and commands. This modular design reduces size, increases power density, and improves the overall stability of the power supply. When any unit malfunctions, it can autonomously exit the system without affecting the operation of other units, ensuring derating for a short period. Maintenance only requires replacing the current module, significantly improving system reliability and stability while reducing maintenance costs.
[0028] The AC-DC unit and DC-AC unit include a three-phase PWM rectifier circuit, a CLLC circuit, and an H-bridge inverter circuit, which are connected in sequence.
[0029] like Figure 2 As shown, the three-phase PWM rectifier circuit includes inductors L1 to L3, switching transistors Q1 to Q6, and capacitors C1 to C3. Switches Q1 and Q2 are connected in series to form phase A. One end of inductor L1 is connected to the input AC power A, and the other end is connected to phase A, with the connection point between switching transistors Q1 and Q2. Switches Q3 and Q4 are connected in series to form phase B. One end of inductor L2 is connected to the input AC power B, and the other end is connected to phase B, with the connection point between switching transistors Q3 and Q4. Switches Q5 and Q6 are connected in series to form phase C. One end of inductor L3 is connected to the input AC power C, and the other end is connected to phase C, with the connection point between switching transistors Q5 and Q6. The phase A, phase B, and phase C bridge arms are connected in parallel. One end of capacitors C1, C2, and C3 is connected together. The other end of capacitor C1 is connected to the end of inductor L1 that is connected to the input AC power A. The other end of capacitor C2 is connected to the end of inductor L2 that is connected to the input AC power B. The other end of capacitor C3 is connected to the end of inductor L3 that is connected to the input AC power C.
[0030] This embodiment employs a typical three-phase bridge arm structure to achieve high power factor correction, adapting to the needs of industrial power grids. Each phase bridge arm is independent and connected in parallel, balancing current distribution and improving stability. Furthermore, capacitors C1 to C3 and inductors L1 to L3 form an LC filter network, effectively suppressing high-frequency mains noise and protecting subsequent circuits.
[0031] The CLLC circuit includes switching transistors Q7 to Q18, inductors L4, L5, and L10, capacitors C4, C5, and C10, and transformer T1. Switches Q7 and Q8, connected in series, are connected in parallel with switches Q9 and Q10, and their parallel connection is then connected to the terminals of switches Q5 and Q6, which are connected in series. Two capacitors, connected in series, are connected to the terminals of switches Q5 and Q7 and Q6 and Q8, respectively. One end of inductor L4 is connected to the terminal of switches Q7 and Q8, and the other end of inductor L4 is connected to one end of capacitor C4. The other end of capacitor C4 is connected to one end of the primary winding of transformer T1, and the other end of the primary winding of transformer T1 is connected to the terminal of switches Q9 and Q10.
[0032] Transformer T1 includes a first secondary winding and a second secondary winding, which improves power distribution flexibility. Series-connected switches Q11 and Q12 are connected in parallel with series-connected switches Q13 and Q14. One end of inductor L5 is connected to one end of the first secondary winding of transformer T1, and the other end of inductor L5 is connected to one end of capacitor C5. The other end of capacitor C5 is connected to the end where switches Q11 and Q12 are connected. The other end of the first secondary winding of transformer T1 is connected to the end where switches Q13 and Q14 are connected. Series-connected switches Q15 and Q16 are connected in parallel with series-connected switches Q17 and Q18. One end of inductor L10 is connected to one end of the second secondary winding of transformer T1, and the other end of inductor L10 is connected to one end of capacitor C10. The other end of capacitor C10 is connected to the end where switches Q15 and Q16 are connected. The other end of the second secondary winding of transformer T1 is connected to the end where switches Q17 and Q18 are connected.
[0033] The H-bridge inverter circuit includes transistors Q19 to Q26, inductors L6 to L9, switches K1 to K3, and an output capacitor. Transistors Q19 and Q20 are connected in parallel with series-connected transistors Q21 and Q22. The two ends of this parallel connection are then connected to the two ends of series-connected transistors Q13 and Q14. Two capacitors are connected in series, with their ends connected to the ends of transistors Q13 and Q19 and Q14 and Q20, respectively. Similarly, series-connected transistors Q23 and Q24 are connected in parallel with series-connected transistors Q25 and Q26. The two ends of this parallel connection are then connected to the two ends of series-connected transistors Q17 and Q18. Two capacitors are connected in series, with their ends connected to the ends of transistors Q17 and Q23 and Q18 and Q24, respectively.
[0034] One end of inductor L8 is connected to the terminal joint of switching transistors Q23 and Q24. The other end of inductor L8 is connected to one end of switch K1. The other end of switch K1 is connected to one end of inductor L6. The other end of inductor L6 is connected to the terminal joint of switching transistors Q19 and Q20. The other end of inductor L8 is also connected to one end of switch K2. The other end of switch K2 is connected to one end of inductor L7. The other end of inductor L7 is connected to the terminal joint of switching transistors Q21 and Q22. One end of inductor L9 is connected to the terminal joint of switching transistors Q25 and Q26. The other end of inductor L9 is connected to one end of switch K3. The other end of switch K3 is connected to the terminal joint of inductor L7 and switch K2. One end of the output capacitor is connected to the terminal joint of inductor L6 and switch K1. The other end of the output capacitor is connected to the terminal joint of inductor L9 and switch K3.
[0035] In this invention, switches K1 to K3 can dynamically switch the output path to suit different operating conditions. When the user uses high-voltage equipment, K2 is closed, K1 and K3 are open, inductors L7 and L8 are connected in series, and the output is a series output, capable of outputting high DC and AC power. When the system requires low voltage and high current, K2 is open, K1 and K3 are closed, and the two H4 bridges form an interleaved parallel connection, thus achieving low voltage and high current. Therefore, this invention, through the H4 bridge method, can achieve four-quadrant power operation and can realize both DC and AC power output. By adjusting the switches, it can be applied to various scenarios.
[0036] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. Therefore, any equivalent changes made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.
Claims
1. A high-power modular power supply, characterized in that, It includes a main control system, several AC-DC units and several DC-AC units. One AC-DC unit and one DC-AC unit are interlocked at the node. Each AC-DC unit is connected to the main control system via a bus. The DC-AC units are connected in pairs. Each DC-AC unit is connected to the main control system. The AC-DC unit and DC-AC unit include a three-phase PWM rectifier circuit, a CLLC circuit and an H-bridge inverter circuit, which are connected in sequence.
2. The high-power modular power supply according to claim 1, characterized in that, The three-phase PWM rectifier circuit includes inductors L1 to L3 and switching transistors Q1 to Q6. Switches Q1 and Q2 are connected in series to form phase A bridge arm. One end of inductor L1 is connected to the input AC power A, and the other end is connected to phase A bridge arm. The connection point is located between switching transistors Q1 and Q2. Switches Q3 and Q4 are connected in series to form phase B bridge arm. One end of inductor L2 is connected to the input AC power B, and the other end is connected to phase B bridge arm. The connection point is located between switching transistors Q3 and Q4. Switches Q5 and Q6 are connected in series to form phase C bridge arm. One end of inductor L3 is connected to the input AC power C, and the other end is connected to phase C bridge arm. The connection point is located between switching transistors Q5 and Q6. The phase A, phase B, and phase C bridge arms are connected in parallel.
3. A high-power modular power supply according to claim 2, characterized in that, The three-phase PWM rectifier circuit also includes capacitors C1 to C3. One end of capacitors C1, C2, and C3 is connected to the other end of capacitor C1, which is connected to the inductor L1 and the input AC power A. The other end of capacitor C2 is connected to the inductor L2 and the input AC power B. The other end of capacitor C3 is connected to the inductor L3 and the input AC power C.
4. A high-power modular power supply according to claim 2, characterized in that, The CLLC circuit includes switching transistors Q7 to Q10, inductor L4, capacitor C4, and transformer T1. Switches Q7 and Q8, which are connected in series, are connected in parallel with switches Q9 and Q10, which are also connected in series. The two ends of the parallel connection are connected to the two ends of Q5 and Q6, which are connected in series. One end of inductor L4 is connected to the end where switches Q7 and Q8 are connected, and the other end of inductor L4 is connected to one end of capacitor C4. The other end of capacitor C4 is connected to one end of the primary winding of transformer T1, and the other end of the primary winding of transformer T1 is connected to the end where switches Q9 and Q10 are connected.
5. A high-power modular power supply according to claim 4, characterized in that, The transformer T1 includes a first secondary winding and a second secondary winding.
6. A high-power modular power supply according to claim 5, characterized in that, The CLLC circuit also includes switching transistors Q11 to Q14, inductor L5, capacitor C5, and series-connected switching transistors Q11 and Q12 connected in parallel with series-connected switching transistors Q13 and Q14. One end of inductor L5 is connected to one end of the first secondary winding of transformer T1, and the other end of inductor L5 is connected to one end of capacitor C5. The other end of capacitor C5 is connected to the end where switching transistors Q11 and Q12 are connected, and the other end of the first secondary winding of transformer T1 is connected to the end where switching transistors Q13 and Q14 are connected.
7. A high-power modular power supply according to claim 6, characterized in that, The CLLC circuit also includes switching transistors Q15 to Q18, inductor L10, capacitor C10, and series-connected switching transistors Q15 and Q16 connected in parallel with series-connected switching transistors Q17 and Q18. One end of inductor L10 is connected to one end of the second secondary winding of transformer T1, and the other end of inductor L10 is connected to one end of capacitor C10. The other end of capacitor C10 is connected to the end where switching transistors Q15 and Q16 are connected, and the other end of the second secondary winding of transformer T1 is connected to the end where switching transistors Q17 and Q18 are connected.
8. A high-power modular power supply according to claim 6, characterized in that, The H-bridge inverter circuit includes switches Q19 to Q26. Switches Q19 and Q20 are connected in parallel with series switches Q21 and Q22, and their two ends are connected to the two ends of series switches Q13 and Q14. Series switches Q23 and Q24 are connected in parallel with series switches Q25 and Q26, and their two ends are connected to the two ends of series switches Q17 and Q18.
9. A high-power modular power supply according to claim 8, characterized in that, The H-bridge inverter circuit also includes inductors L6 to L9 and switches K1 to K3. One end of inductor L8 is connected to the end where switching transistors Q23 and Q24 are connected, and the other end of inductor L8 is connected to one end of switch K1. The other end of switch K1 is connected to one end of inductor L6. The other end of inductor L6 is connected to the end where switching transistors Q19 and Q20 are connected. The other end of inductor L8 is also connected to one end of switch K2. The other end of switch K2 is connected to one end of inductor L7. The other end of inductor L7 is connected to the end where switching transistors Q21 and Q22 are connected. One end of inductor L9 is connected to the end where switching transistors Q25 and Q26 are connected, and the other end of inductor L9 is connected to one end of switch K3. The other end of switch K3 is connected to the end where inductor L7 and switch K2 are connected.
10. A high-power modular power supply according to claim 9, characterized in that, The H-bridge inverter circuit also includes an output capacitor. One end of the output capacitor is connected to the end where inductor L6 is connected to switch K1, and the other end of the output capacitor is connected to the end where inductor L9 is connected to switch K3.