Three-stage alternating-current parallel voltage-stabilized power supply system
By adopting a three-stage AC parallel voltage-regulating power system, the series and parallel design of multiple voltage-regulating power modules are used to solve the volatility and instability of the existing power system in AC power utilization, and a power system with high stability and high power output is achieved.
Patent Information
- Application Number
- CN202421588605.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-05
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-07-05
AI Technical Summary
Existing power systems have volatility and instability when utilizing AC power, especially in scenarios where high-stability power supply supply is required, and at the same time, the modular design is insufficient, making it difficult to achieve parallel use under high-power demand.
A three-stage AC parallel voltage stabilization power system is adopted, including multiple voltage stabilization power modules, each module includes an APFC converter, a DC-DC converter and an H-bridge inverter. The coordinated work of each part is realized through a digital controller to realize three-stage series voltage stabilization and parallel expansion.
Under a wide range of input voltage, the AC voltage is stable and the power reaches 3kW, which significantly improves the stability and anti-fluctuation ability of the power supply system and ensures stable and reliable output.
Smart Images
Figure CN222981396U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of power supply systems, and particularly relates to a three - stage AC parallel regulated power supply system. Background Technique
[0002] When the existing power supply systems utilize AC power, there are problems of volatility and instability. Especially in scenarios such as railway signal systems that require high - stability power supply, traditional power supply systems are difficult to meet the high - power - supply - quality requirements. In addition, the existing power supply modular design is insufficient, and it is difficult to achieve parallel use under high - power requirements. Content of the Utility Model
[0003] The technical problem to be solved by the utility model is to provide a three - stage AC parallel regulated power supply system aiming at the deficiencies in the above - mentioned existing technologies. Its system structure is simple, the design is reasonable, and it is easy to implement. By adopting three - stage series connection, it can stably output 220V AC voltage under wide - range input voltage conditions, with a power of up to 3kW. At the same time, it has multi - module parallel use, significantly improves the stability and anti - fluctuation ability of the power supply system, ensures stable and reliable output, has good use effects, and is convenient for popularization and use.
[0004] To solve the above - mentioned technical problems, the technical solution adopted by the utility model is: a three - stage AC parallel regulated power supply system, including a plurality of regulated power supply modules that can be expanded in parallel. The input end of the regulated power supply module is used to connect to 220V AC mains, and the output end of the regulated power supply module is used to connect to a load; each regulated power supply module includes an APFC converter, a DC - DC converter, and an H - bridge inverter connected in series in sequence.
[0005] In the above - mentioned three - stage AC parallel regulated power supply system, the APFC converter and the DC - DC converter are both connected with a UCD3138 digital controller; the H - bridge inverter is connected with a C2000 digital controller; both the UCD3138 digital controller and the C2000 digital controller are connected with an STM32 microcontroller.
[0006] In the above - mentioned three - stage AC parallel regulated power supply system, the APFC converter includes diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, non - polar capacitor C 1 , non - polar capacitor C 2 , inductor L m1 , inductor L m2, MOS transistors S1 and S2. The anode of diode D1 and the cathode of diode D3 are both connected to one end of the 220V AC mains. The anode of diode D2 and the cathode of diode D4 are both connected to the other end of the 220V AC mains. The cathode of diode D1, the cathode of diode D2, one end of inductor L m1 one end of inductor L m2 one end of non-polar capacitor C 1 one end are all connected to the anode of diode D7. The other end of inductor L m2 and the drain of MOS transistor S2 are both connected to the anode of diode D6. The other end of inductor L m1 and the drain of MOS transistor S1 are both connected to the anode of diode D5. One end of non-polar capacitor C 2 is connected to the cathodes of diode D5, diode D6 and diode D7, and is the first signal output terminal of the APFC converter; the other end of non-polar capacitor C 2 is connected to the anode of diode D3, the anode of diode D4, the other end of non-polar capacitor C 1 the other end, the source of MOS transistor S1 and the source of MOS transistor S2, and is the second signal output terminal of the APFC converter.
[0007] In the above three-stage AC parallel voltage stabilization power supply system, the DC-DC converter includes MOS transistors S3, S4, S5, S6, non-polar capacitor C 3 , non-polar capacitor C 4 , non-polar capacitor C r , inductor L r , inductor L m3 , transformer T, diode D8 and diode D9. The drain of MOS transistor S3, the drain of MOS transistor S4 and one end of non-polar capacitor C 3 are all connected to the first signal output terminal of the APFC converter. The source of MOS transistor S3 and the drain of MOS transistor S5 are both connected to one end of inductor L r . The source of MOS transistor S4 and the drain of MOS transistor S6 are both connected to one end of non-polar capacitor C r . The sources of MOS transistors S5 and S6 and the other end of non-polar capacitor C 3 are all connected to the second signal output terminal of the APFC converter. One end of the primary side of transformer T and one end of inductor L m3 are both connected to the other end of inductor L r . The other end of the primary side of transformer T and the other end of inductor L m3 are both connected to the other end of non-polar capacitor C ris connected to the other end. One end of the secondary side of the transformer T is connected to the anode of the diode D8, and the other end of the secondary side of the transformer T is connected to the anode of the diode D9. The non-polar capacitor C 4 has one end connected to both the cathode of the diode D8 and the cathode of the diode D9, and serves as the first signal output terminal of the DC-DC converter; the non-polar capacitor C 4 has the other end connected to the neutral end of the secondary side of the transformer T, and serves as the second signal output terminal of the DC-DC converter.
[0008] In the above three-stage AC parallel regulated power supply system, the H-bridge inverter includes MOS transistors S7, S8, S9, S10, non-polar capacitor C 5 , inductor L m4 and non-polar capacitor C o . The drain of the MOS transistor S7, the drain of the MOS transistor S8, and one end of the non-polar capacitor C 5 are all connected to the first signal output terminal of the DC-DC converter. The source of the MOS transistor S9, the source of the MOS transistor S10, and the other end of the non-polar capacitor C 5 are all connected to the second signal output terminal of the DC-DC converter. The source of the MOS transistor S7 and the drain of the MOS transistor S9 are both connected to one end of the inductor L m4 . One end of the non-polar capacitor C o is connected to both the source of the MOS transistor S8 and the drain of the MOS transistor S10, and serves as the first signal output terminal of the H-bridge inverter; the other end of the non-polar capacitor C o is connected to the other end of the inductor L m4 , and serves as the second signal output terminal of the H-bridge inverter.
[0009] Compared with the prior art, the present invention has the following advantages: The system structure of the present invention is simple, reasonably designed, and easy to implement. By adopting three-stage series connection, it can stably output an AC 220V voltage under wide-range input voltage conditions, with a power of up to 3kW. At the same time, it has multi-module parallel connection, significantly improving the stability and anti-fluctuation ability of the power supply system, ensuring stable and reliable output, with good use effect and being convenient for popularization and use.
[0010] The technical solution of the present invention will be further described in detail below through the drawings and embodiments. Brief Description of the Drawings
[0011] Figure 1 is the system principle block diagram of the present invention;
[0012] Figure 2 is the principle block diagram of a single new type of regulated power supply module of the present invention;
[0013] Figure 3 is the circuit schematic diagram of this practical APFC converter;
[0014] Figure 4 is the circuit schematic diagram of this practical DC - DC converter;
[0015] Figure 5 is the circuit schematic diagram of this practical H - bridge inverter. Specific implementation manners
[0016] As Figure 1 shown, the three - stage AC parallel voltage - stabilized power supply system of the present utility model includes a plurality of voltage - stabilized power supply modules capable of parallel expansion. The input end of each voltage - stabilized power supply module is used to connect to 220V AC mains, and the output end of the voltage - stabilized power supply module is used to connect to a load; each voltage - stabilized power supply module includes an APFC converter, a DC - DC converter, and an H - bridge inverter connected in series in sequence.
[0017] In this embodiment, both the APFC converter and the DC - DC converter are connected to a UCD3138 digital controller; the H - bridge inverter is connected to a C2000 digital controller; both the UCD3138 digital controller and the C2000 digital controller are connected to an STM32 microcontroller.
[0018] During specific implementation, as Figure 2As shown, both the APFC converter and the DC-DC converter are connected to the input terminal of the UCD3138 digital controller through a sampling circuit, and the UCD3138 digital controller is connected to the input terminals of the APFC converter and the DC-DC converter through a drive circuit; the H-bridge inverter is connected to the input terminal of the C2000 digital controller through a sampling circuit, and the C2000 digital controller is connected to the input terminal of the H-bridge inverter through a drive circuit; the sampling circuit uses the TI ADS8691 chip, and the drive circuit uses the TI UCC27517 chip. An auxiliary power supply is connected between the APFC converter and the DC-DC converter, and the STM32 microcontroller is connected to a thermal management module. The STM32 microcontroller is used for the status monitoring and management of the overall module, communication with the host computer, and parallel coordination with other modules. Through the real-time control of the UCD3138 digital controller, the APFC converter compensates for the input voltage fluctuation; through the feedback control of the UCD3138 digital controller, the DC-DC converter monitors and adjusts the output voltage in real time, and outputs a stable DC voltage by adjusting the switching frequency or duty cycle; at the same time, the LLC resonant soft-switching technology is adopted to reduce the switching loss and improve the system efficiency and stability. The C2000 digital controller adjusts the switching state of the H-bridge inverter in real time to ensure the output of a stable sinusoidal AC voltage. The C2000 digital controller has powerful computing capabilities and flexible PWM control, and can adjust the output voltage and frequency as needed to maintain an output of 220V and 50Hz.
[0019] In this embodiment, as Figure 3 shown, the APFC converter includes diode D1, diode D2, diode D3, diode D4, diode D5, diode D6, diode D7, non-polar capacitor C 1 , non-polar capacitor C 2 , inductor L m1 , inductor L m2 , MOS transistor S1 and MOS transistor S2. The anode of diode D1 and the cathode of diode D3 are both connected to one end of the 220V AC mains, and the anode of diode D2 and the cathode of diode D4 are both connected to the other end of the 220V AC mains. The cathode of diode D1, the cathode of diode D2, one end of inductor L m1 , one end of inductor L m2 , and one end of non-polar capacitor C 1 are all connected to the anode of diode D7. The other end of inductor L m2 and the drain of MOS transistor S2 are both connected to the anode of diode D6. The other end of inductor L m1 and the drain of MOS transistor S1 are both connected to the anode of diode D5. The non-polar capacitor C 2One end is connected to the cathodes of diode D5, diode D6, and diode D7, and is the first signal output terminal of the APFC converter; the non-polar capacitor C 2 The other end is connected to the anodes of diode D3, diode D4, the other end of non-polar capacitor C 1 The other end, the source of MOS transistor S1, and the source of MOS transistor S2 are all connected, and is the second signal output terminal of the APFC converter.
[0020] In specific implementation, the main function of the APFC (Active Power Factor Correction) converter is to improve the power factor of the power supply, reduce grid harmonic interference, and improve the overall efficiency. In the circuit, diodes D1, D2, D3, and D4 form a bridge rectifier, and diodes D5, D6, and D7 are used to prevent reverse current. Non-polar capacitor C 1 And non-polar capacitor C 2 Are used for filtering to output a smooth voltage. Inductors L m1 And inductor L m2 Are used to store and convert energy. MOS transistors S1 and S2 control the switching state through the UCD3138 digital controller to achieve the regulation of boost conversion. The input alternating current passes through the bridge rectifier composed of diodes D1, D2, D3, and D4 to convert the alternating current into pulsating direct current, then boosts it to stable direct current, and corrects the power factor by adjusting the switches of MOS transistors S1 and S2, improving the power supply efficiency and reducing grid harmonic interference.
[0021] In this embodiment, as Figure 4 Shown, the DC-DC converter includes MOS transistors S3, S4, S5, S6, non-polar capacitor C 3 、Non-polar capacitor C 4 、Non-polar capacitor C r 、Inductor L r 、Inductor L m3 、Transformer T, diode D8, and diode D9. The drains of MOS transistor S3, the drain of MOS transistor S4, and one end of non-polar capacitor C 3 Are all connected to the first signal output terminal of the APFC converter. The source of MOS transistor S3 and the drain of MOS transistor S5 are both connected to one end of inductor L r The source of MOS transistor S4 and the drain of MOS transistor S6 are both connected to one end of non-polar capacitor C r One end is connected. The sources of MOS transistor S5, MOS transistor S6, and non-polar capacitor C 3The other ends are all connected to the second signal output terminal of the APFC converter. One end of the primary side of the transformer T and the inductor L m3 One end of are both connected to the inductor L r The other end is connected. The other end of the primary side of the transformer T and the inductor L m3 The other ends are all connected to the non-polar capacitor C r The other end is connected. One end of the secondary side of the transformer T is connected to the anode of the diode D8, and the other end of the secondary side of the transformer T is connected to the anode of the diode D9. The non-polar capacitor C 4 One end is connected to the cathodes of both the diode D8 and the diode D9, and it is the first signal output terminal of the DC-DC converter; the other end of the non-polar capacitor C 4 is connected to the neutral end of the secondary side of the transformer T, and it is the second signal output terminal of the DC-DC converter.
[0022] During specific implementation, the MOS transistors S3, S4, S5, and S6 form an H-bridge circuit. By controlling the on and off sequence of these four switches through the UCD3138 digital controller, direct current can be converted into alternating current. During the forward conversion period, the MOS transistors S3 and S6 are turned on, and the current flows through the inside of the load; while during the reverse conversion period, the MOS transistors S4 and S5 are turned on, and the same current passes through the load, but in the opposite direction. The non-polar capacitor C r and the inductor L r form a resonant cavity filter circuit. The transformer T converts the high-frequency alternating current (generated by the H-bridge) into the required output voltage and power through resonant conversion. The output rectification part rectifies the high-frequency alternating current output by the transformer into direct current through the diodes D8 and D9, and outputs it after being filtered by the non-polar capacitor C 4 .
[0023] In this embodiment, as Figure 5 shown, the H-bridge inverter includes the MOS transistors S7, S8, S9, S10, the non-polar capacitor C 5 , the inductor L m4 and the non-polar capacitor C o . The drain of the MOS transistor S7, the drain of the MOS transistor S8, and one end of the non-polar capacitor C 5 are all connected to the first signal output terminal of the DC-DC converter. The source of the MOS transistor S9, the source of the MOS transistor S10, and the other end of the non-polar capacitor C 5 are all connected to the second signal output terminal of the DC-DC converter. The source of the MOS transistor S7 and the drain of the MOS transistor S9 are both connected to one end of the inductor L m4 . The non-polar capacitor C oOne end thereof is connected to both the source of MOS transistor S8 and the drain of MOS transistor S10, and serves as the first signal output terminal of the H-bridge inverter; the non-polar capacitor C o The other end thereof is connected to the other end of the inductor L m4 The other end of which is connected, and serves as the second signal output terminal of the H-bridge inverter.
[0024] In specific implementation, MOS transistors S7, S8, S9, and S10 are controlled by a C2000 digital controller in a specific order to convert the DC input into an AC output. When MOS transistors S7 and S10 are turned on, the current flows from the DC input through MOS transistor S7, through the load, and then returns to the negative pole through MOS transistor S10 to complete the positive half-cycle; when MOS transistors S8 and S9 are turned on, the current flows from the DC input through MOS transistor S8, through the load, and then through MOS transistor S9 to the negative pole to complete the negative half-cycle. By alternately turning on MOS transistors S7 and S10 and MOS transistors S8 and S9, an AC waveform is generated at the output terminal.
[0025] The working process of the present invention is as follows: The input of the system is the commercial power of 220V±30%, 50Hz. After being rectified and power factor corrected by the APFC converter, the obtained output is used as the input of the intermediate isolated DC-DC converter, and then after being regulated by LLC, the required output is obtained as the input of the H-bridge inverter, and an AC output voltage of 220V, 50Hz with a complete sine variation is obtained through the H-bridge inverter. Among them, the APFC converter and the DC-DC converter jointly use a UCD3138 digital controller, the H-bridge inverter uses a C2000 digital controller, and the working state management of the entire system, communication with the upper computer, and coordination management with other parallel modules use an STM32 microcontroller.
[0026] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.
Claims
1. A three-stage AC parallel regulated power supply system, characterized in that: It comprises a plurality of voltage-stabilized power supply modules that can be expanded in parallel, wherein the input end of the voltage-stabilized power supply module is used to connect to 220V AC mains power, and the output end of the voltage-stabilized power supply module is used to connect to a load; each of the voltage-stabilized power supply modules comprises an APFC converter, a DC-DC converter and an H-bridge inverter connected in series in sequence.
2. A three-stage AC parallel regulated power supply system according to claim 1, characterized in that: The APFC converter and the DC-DC converter are both connected to a UCD3138 digital controller; the H-bridge inverter is connected to a C2000 digital controller; and the UCD3138 digital controller and the C2000 digital controller are both connected to an STM32 microcontroller.
3. A three-stage AC parallel regulated power supply system according to claim 1, characterized in that: The APFC converter includes a diode D1, a diode D2, a diode D3, a diode D4, a diode D5, a diode D6, a diode D7, a non-polar capacitor C1, a non-polar capacitor C2, an inductor L m1 、Inductance L m2 , MOS tube S1 and MOS tube S2, the anode of the diode D1 and the cathode of the diode D3 are connected to one end of the 220V AC mains, the anode of the diode D2 and the cathode of the diode D4 are connected to the other end of the 220V AC mains, the cathode of the diode D1, the cathode of the diode D2, the inductor L m1 One end of the inductor L m2 One end of the inductor L and one end of the non-polar capacitor C1 are connected to the anode of the diode D7. m2 The other end of the inductor L and the drain of the MOS tube S2 are connected to the anode of the diode D6. m1 The other end of the non-polar capacitor C2 and the drain of the MOS tube S1 are connected to the anode of the diode D5, one end of the non-polar capacitor C2 is connected to the cathode of the diode D5, the cathode of the diode D6 and the cathode of the diode D7, and is the first signal output end of the APFC converter; the other end of the non-polar capacitor C2 is connected to the anode of the diode D3, the anode of the diode D4, the other end of the non-polar capacitor C1, the source of the MOS tube S1 and the source of the MOS tube S2, and is the second signal output end of the APFC converter.
4. A three-stage AC parallel regulated power supply system according to claim 3, characterized in that: The DC-DC converter includes MOS transistor S3, MOS transistor S4, MOS transistor S5, MOS transistor S6, non-polar capacitor C3, non-polar capacitor C4, non-polar capacitor C r 、Inductance L r 、Inductance L m3 , transformer T, diode D8 and diode D9, the drain of the MOS tube S3, the drain of the MOS tube S4 and one end of the non-polar capacitor C3 are all connected to the first signal output end of the APFC converter, the source of the MOS tube S3 and the drain of the MOS tube S5 are all connected to the inductor L r The source of the MOS tube S4 and the drain of the MOS tube S6 are connected to the non-polar capacitor C r The source of the MOS tube S5, the source of the MOS tube S6 and the other end of the non-polar capacitor C3 are all connected to the second signal output end of the APFC converter, and one end of the primary side of the transformer T and the inductor L m3 One end of the inductor L r The other end of the primary side of the transformer T and the inductor L are connected m3 The other end is connected to the non-polar capacitor C r The other end of the secondary side of the transformer T is connected to the anode of the diode D8, the other end of the secondary side of the transformer T is connected to the anode of the diode D9, one end of the non-polar capacitor C4 is connected to both the cathode of the diode D8 and the cathode of the diode D9, and is the first signal output end of the DC-DC converter; the other end of the non-polar capacitor C4 is connected to the neutral end of the secondary side of the transformer T, and is the second signal output end of the DC-DC converter.
5. A three-stage AC parallel regulated power supply system according to claim 4, characterized in that: The H-bridge inverter includes MOS tube S7, MOS tube S8, MOS tube S9, MOS tube S10, non-polar capacitor C5, inductor L m4 and non-polar capacitor C o The drain of the MOS tube S7, the drain of the MOS tube S8 and one end of the non-polar capacitor C5 are all connected to the first signal output end of the DC-DC converter, the source of the MOS tube S9, the source of the MOS tube S10 and the other end of the non-polar capacitor C5 are all connected to the second signal output end of the DC-DC converter, the source of the MOS tube S7 and the drain of the MOS tube S9 are all connected to the inductor L m4 One end of the non-polar capacitor C o One end of is connected to the source of MOS tube S8 and the drain of MOS tube S10, and is the first signal output end of the H-bridge inverter; the non-polar capacitor C o The other end of the inductor L m4 The other end is connected to and is the second signal output end of the H-bridge inverter.