Water electrolysis hydrogen production power supply adopting three-phase staggered BUCK and open-loop full-bridge topological structure
By adopting three-phase interleaved BUCK and open-loop full-bridge topology electrolytic hydrogen production power supply, combined with three-phase and three-level VIENNA active power factor correction circuit and open-loop full-bridge circuit, the problems of low efficiency, poor stability and high complexity of traditional electrolytic hydrogen production power supply systems are solved, and an efficient and stable electrolytic hydrogen production process is achieved.
Patent Information
- Application Number
- CN202510644478.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-19
- Publication Date
- 2025-07-04
AI Technical Summary
The traditional electrolytic hydrogen production power system has problems such as bulky, low efficiency and poor stability, and cannot effectively utilize wind and photoelectric power. The power system is highly complex, making it difficult to meet the high efficiency and stability requirements of electrolytic hydrogen production.
The electrolytic water-generating hydrogen power supply with three-phase interleaved BUCK and open-loop full-bridge topology is adopted, and combined with three-phase and three-level VIENNA active power factor correction circuit, BUCK circuit and open-loop full-bridge circuit, the circuit design and control strategy are optimized to achieve input current equalization distribution and DC output stability.
It improves the friendliness of the power grid, reduces voltage ripple and harmonic pollution, enhances system stability and hydrogen production efficiency, and reduces the complexity and cost of the power supply system.
Smart Images
Figure CN120262898A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of hydrogen production by electrolyzing water, and more specifically to a hydrogen production power supply for electrolyzing water that adopts a three-phase interleaved BUCK and open-loop full-bridge topology structure. Background Art
[0002] With the development of clean energy in large-scale wind and photovoltaic power plants, the phenomenon of curtailment of wind and light has also emerged. By using the curtailed wind and light power for electrolyzing water to produce hydrogen and realizing the conversion of electricity to hydrogen, these originally wasted energies can be reasonably utilized. At the same time, hydrogen production by electrolyzing water can suppress the fluctuations of renewable energy grid connection, achieve the spatio-temporal translation of energy, solve part of the "curtailment of wind and light" problem, and replace fossil fuels to provide green fuels for fields such as chemical industry, industry, and transportation. As an important hydrogen production method, higher performance requirements are also imposed on its power supply system. The traditional hydrogen production power supply system for electrolyzing water uses thyristor rectification, which has problems such as being bulky, having low efficiency, and poor stability. Therefore, a new type of power supply system is needed to meet the requirements of hydrogen production by electrolyzing water. Summary of the Invention
[0003] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide a hydrogen production power supply for electrolyzing water that adopts a three-phase interleaved BUCK and open-loop full-bridge topology structure, aiming to improve the hydrogen production efficiency, reduce the ripple of the output voltage, meet the ripple requirements of the electrolytic cell for the DC power supply, reduce energy consumption, and enhance the stability of the system.
[0004] To achieve the above purpose, the present invention provides the following technical solution: A hydrogen production power supply for electrolyzing water that adopts a three-phase interleaved BUCK and open-loop full-bridge topology structure, including:
[0005] A power factor correction circuit, one end of which is connected to an external three-phase power supply for correcting the power factor;
[0006] A BUCK circuit, one end of which is connected to the power factor correction circuit for achieving the balanced distribution of the input current and reducing the output voltage ripple;
[0007] A full-bridge circuit, one end of which is connected to the BUCK circuit for outputting a DC power supply;
[0008] An electrolytic cell, connected to the full-bridge circuit to receive the DC power supply output by the full-bridge circuit for hydrogen production by electrolyzing water. As a further improvement of the present invention, the power factor correction circuit is a three-phase three-level VIENNA active power factor correction circuit, specifically including:
[0009] Phase A circuit. The Phase A circuit includes inductor La, switching transistors ST1, ST2, ST3, and ST4. The switching transistors ST1, ST2, ST3, and ST4 each have a control terminal, a first terminal, and a second terminal. The control terminal controls the on / off between the first terminal and the second terminal. One end of the inductor La is connected to the Phase A of the external three-phase power supply. The first terminal of the switching transistor ST1 is connected to the BUCK circuit. The second terminal of the switching transistor ST1 is connected to the first terminal of the switching transistor ST4. The second terminal of the switching transistor ST4 is connected to the BUCK circuit. The second terminal of the switching transistor ST1 is connected to the first terminal of the switching transistor ST2. The second terminal of the switching transistor ST2 is connected to the second terminal of the switching transistor ST3. The second terminal of the switching transistor ST3 is connected to the BUCK circuit after being connected to the capacitor Cp, and is also connected to the second terminal of the switching transistor ST4 after being connected to the capacitor Cn;
[0010] Phase B circuit. The Phase B circuit includes inductor Lb, switching transistors SS1, SS2, SS3, and SS4. The switching transistors SS1, SS2, SS3, and SS4 each have a control terminal, a first terminal, and a second terminal. The control terminal controls the on / off between the first terminal and the second terminal. One end of the inductor Lb is connected to the Phase B of the external three-phase power supply. The first terminal of the switching transistor SS1 is connected to the BUCK circuit. The second terminal of the switching transistor SS1 is connected to the first terminal of the switching transistor SS4. The second terminal of the switching transistor SS4 is connected to the BUCK circuit. The second terminal of the switching transistor SS1 is connected to the first terminal of the switching transistor SS2. The second terminal of the switching transistor SS2 is connected to the second terminal of the switching transistor SS3. The second terminal of the switching transistor SS3 is connected to the BUCK circuit after being connected to the capacitor Cp, and is also connected to the second terminal of the switching transistor SS4 after being connected to the capacitor Cn;
[0011] Phase C circuit. The Phase C circuit includes inductor Lc, switching transistors SR1, SR2, SR3, and SR4. The switching transistors SR1, SR2, SR3, and SR4 each have a control terminal, a first terminal, and a second terminal. The control terminal controls the on / off between the first terminal and the second terminal. One end of the inductor LC is connected to the Phase C of the external three-phase power supply. The first terminal of the switching transistor SR1 is connected to the BUCK circuit. The second terminal of the switching transistor SR1 is connected to the first terminal of the switching transistor SR4. The second terminal of the switching transistor SR4 is connected to the BUCK circuit. The second terminal of the switching transistor SR1 is connected to the first terminal of the switching transistor SR2. The second terminal of the switching transistor SR2 is connected to the second terminal of the switching transistor SR3. The second terminal of the switching transistor SR3 is connected to the CUCK circuit after being connected to the capacitor Cp, and is also connected to the second terminal of the switching transistor SR4 after being connected to the capacitor Cn.
[0012] As a further improvement of the present invention, the BUCK circuit is a three-phase interleaved BUCK circuit, which includes a phase A loop, a phase B loop, and a phase C loop. The phase A loop, the phase B loop, and the phase C loop have the same circuit structure. The phase A loop includes:
[0013] A switching transistor SBBH, which has a control terminal, a first terminal, and a second terminal. A capacitor Cin and a capacitor C1 are connected in parallel at the first terminal of the switching transistor SBBH and then connected to a power factor correction circuit. The second terminal of the switching transistor SBBH is connected to an inductor Lf, and then a capacitor C2 is connected in parallel and then connected to a full-bridge circuit;
[0014] A switching transistor SBBL, which has a control terminal, a first terminal, and a second terminal. The first terminal of the switching transistor SBBL is connected to the second terminal of the switching transistor SBBH, and the second terminal of the switching transistor SBBL is connected in parallel with the capacitor C2 and then connected to the full-bridge circuit.
[0015] As a further improvement of the present invention, the full-bridge circuit is an open-loop full-bridge circuit, which includes a phase A loop, a phase B loop, and a phase C loop. The phase A loop, the phase B loop, and the phase C loop have the same circuit structure. The phase A loop includes:
[0016] A first full-bridge circuit, one end of which is connected to the BUCK circuit;
[0017] A second full-bridge circuit, one end of which is connected to a transformer Np and then connected to the first full-bridge circuit, and the other end is connected in parallel with a capacitor Vo and then connected to an electrolytic cell;
[0018] A third full-bridge circuit, one end of which is connected to a transformer Np and then connected to the first full-bridge circuit, and the other end is connected in parallel with a capacitor Vo and then connected to an electrolytic cell.
[0019] As a further improvement of the present invention, the first full-bridge circuit includes a switching transistor S1, a switching transistor S2, a switching transistor S3, and a switching transistor S4. The switching transistor S1, the switching transistor S2, the switching transistor S3, and the switching transistor S4 all have a control terminal, a first terminal, and a second terminal. The first terminal of the switching transistor S1 is connected to the BUCK circuit, the second terminal is connected to the first terminal of the switching transistor S3, and is also connected to the transformer Np. The first terminal of the switching transistor S2 is connected to the first terminal of the switching transistor S1, the second terminal is connected to the first terminal of the switching transistor S4, and is also connected to the transformer Np. The second terminals of the switching transistor S3 and the switching transistor S4 are connected to each other and then connected to the BUCK circuit.
[0020] Advantages of the present invention:
[0021] Improve grid friendliness: The three-phase three-level VIENNA active power factor correction circuit improves the PF value, reduces the THD and the voltage ripple of the DC bus.
[0022] Improve hydrogen production efficiency: The three-phase interleaved BUCK circuit is adopted to achieve balanced distribution of input current and reduction of ripple, reducing the loss of input power. At the same time, the open-loop full-bridge circuit realizes efficient and stable DC output, improving the hydrogen production efficiency.
[0023] Enhance system stability: The combined use of the three-phase interleaved BUCK circuit and the open-loop full-bridge circuit makes the entire power supply system have better stability and anti-interference ability, and can adapt to the hydrogen production requirements under different working conditions. Reduce costs: By optimizing the circuit design and control strategy, the complexity and cost of the power supply system are reduced, and the economy of hydrogen production is improved. Brief Description of the Drawings
[0024] Figure 1 It is the circuit diagram of the electrolytic water hydrogen production power supply adopting the three-phase interleaved BUCK and open-loop full-bridge topology structure of the present invention. Detailed Embodiment
[0025] The present invention will be further described in detail below with reference to the embodiments given in the drawings.
[0026] Refer to Figure 1 As shown, an electrolytic water hydrogen production power supply adopting the three-phase interleaved BUCK and open-loop full-bridge topology structure in this embodiment includes a power factor correction circuit, a BUCK circuit, a full-bridge circuit, and an electrolytic cell. One end of the power factor correction circuit is connected to an external three-phase power supply for correcting power, which can effectively improve the utilization efficiency of grid electric energy by the power supply system, improve the power quality, and avoid problems such as waste of electric energy caused by low power factor. One end of the BUCK circuit is connected to the power factor correction circuit, which can achieve balanced distribution of input current and reduction of output voltage ripple, making the circuit operation more stable and reducing the impact of voltage fluctuation on subsequent equipment. One end of the full-bridge circuit is connected to the BUCK circuit for outputting DC power supply to provide stable electric energy for electrolyzing water. The electrolytic cell is connected to the full-bridge circuit to receive the DC power supply output by the full-bridge circuit for electrolyzing water to produce hydrogen, realizing the conversion of electric energy into chemical energy and reasonably utilizing the originally wasted energy.
[0027] Further, the power factor correction circuit is a three-phase three-level VIENNA active power factor correction circuit, specifically including a phase A circuit, a phase B circuit, and a phase C circuit. The phase A circuit includes an inductor La, switching transistors ST1, ST2, ST3, and ST4. Each switching transistor has a control terminal, a first terminal, and a second terminal. The control terminal controls the on / off state between the first terminal and the second terminal. One end of the inductor La is connected to the phase A of the external three-phase power supply. The first terminal of the switching transistor ST1 is connected to the BUCK circuit. The second terminal of the switching transistor ST1 is connected to the first terminal of the switching transistor ST4. The second terminal of the switching transistor ST4 is connected to the BUCK circuit. The second terminal of the switching transistor ST1 is connected to the first terminal of the switching transistor ST2. The second terminal of the switching transistor ST2 is connected to the second terminal of the switching transistor ST3. After the second terminal of the switching transistor ST3 is connected to a capacitor Cp, it is connected to the BUCK circuit, and is also connected to a capacitor Cn and then to the second terminal of the switching transistor ST4. The phase B circuit includes an inductor Lb, switching transistors SS1, SS2, SS3, and SS4. The characteristics of each switching transistor are similar to those of the phase A circuit. One end of the inductor Lb is connected to the phase B of the external three-phase power supply, and the subsequent connection method corresponds to that of the phase A circuit. The phase C circuit includes an inductor Lc, switching transistors SR1, SR2, SR3, and SR4. Similarly, the characteristics of each switching transistor are the same. One end of the inductor LC is connected to the phase C of the external three-phase power supply, and the connection method is also similar to that of the phase A circuit. This three-phase three-level VIENNA active power factor correction circuit can more effectively correct the power factor. Compared with the traditional correction method, it further improves the utilization efficiency of the power grid electrical energy by the power supply system and reduces the harmonic pollution to the power grid.
[0028] Further, the BUCK circuit is a three-phase interleaved BUCK circuit, which includes a phase A loop, a phase B loop, and a phase C loop. The circuit structures of the phase A loop, the phase B loop, and the phase C loop are the same. Taking the phase A loop as an example, it includes a switch tube SBBH and a switch tube SBBL. The switch tube SBBH has a control terminal, a first terminal, and a second terminal. Its first terminal is connected to the power factor correction circuit after being connected in parallel with a capacitor Cin and a capacitor C1. Its second terminal is connected to an inductor Lf and then connected in parallel with a capacitor C2 and then connected to the full-bridge circuit. The switch tube SBBL has a control terminal, a first terminal, and a second terminal. Its first terminal is connected to the second terminal of the switch tube SBBH, and its second terminal is connected to the full-bridge circuit after being connected in parallel with the capacitor C2. The three-phase interleaved BUCK circuit can further optimize the balanced distribution of the input current and reduce the output voltage ripple. Compared with the traditional BUCK circuit, it makes the circuit more stable and reliable, provides a better input for the subsequent full-bridge circuit. In this embodiment, each switch tube is controlled by a PWM controller. The PWM controller generates corresponding PWM control signals according to the changes in the input voltage and current. The power switch tube performs switching actions according to the PWM control signals to realize the chopping and regulation of the input current. The output filter is used to filter out the high-frequency ripple generated after chopping to obtain a smooth DC output.
[0029] Further, the full-bridge circuit is an open-loop full-bridge circuit, which includes a phase A loop, a phase B loop, and a phase C loop. The circuit structures of the phase A loop, the phase B loop, and the phase C loop are the same. Taking the phase A loop as an example, it includes a first full-bridge circuit, a second full-bridge circuit, and a third full-bridge circuit. One end of the first full-bridge circuit is connected to the BUCK circuit. It includes a switch tube S1, a switch tube S2, a switch tube S3, and a switch tube S4. Each switch tube has a control terminal, a first terminal, and a second terminal. The first terminal of the switch tube S1 is connected to the BUCK circuit, the second terminal is connected to the first terminal of the switch tube S3, and is also connected to the transformer Np. The first terminal of the switch tube S2 is connected to the first terminal of the switch tube S1, the second terminal is connected to the first terminal of the switch tube S4, and is also connected to the transformer Np. The second terminals of the switch tube S3 and the switch tube S4 are connected to each other and then connected to the BUCK circuit. One end of the second full-bridge circuit is connected to the transformer Np and then connected to the first full-bridge circuit, and the other end is connected to the electrolytic cell after being connected in parallel with a capacitor Vo. One end of the third full-bridge circuit is connected to the transformer Np and then connected to the first full-bridge circuit, and the other end is connected to the electrolytic cell after being connected in parallel with a capacitor Vo. The open-loop full-bridge circuit can provide a stable DC power output for the electrolytic cell to meet the demand for the stability of electric energy in electrolytic water hydrogen production. Compared with the traditional full-bridge circuit, while achieving stable output, it simplifies the control structure and reduces costs.
[0030] In summary, the electrolytic water hydrogen production power supply in this embodiment adopts a three-phase interleaved BUCK and open-loop full-bridge topology. It uses a three-phase three-level VIENNA active power factor correction technology. After three-phase alternating current is rectified, the DC voltage of the positive and negative busbars is obtained. Compared with the traditional thyristor rectification, the PF value is improved, and the THD and the voltage ripple of the DC busbar are reduced. It is an electrolytic water hydrogen production power supply with a three-phase interleaved BUCK and open-loop full-bridge topology. This power supply realizes the balanced distribution of the input current and the reduction of the ripple through the three-phase interleaved BUCK circuit. At the same time, it uses the open-loop full-bridge circuit to achieve efficient and stable DC output, thereby improving the hydrogen production efficiency and the stability of the system.
[0031] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements should also be regarded as the protection scope of the present invention.
Claims
1. An electrolyzed water hydrogen production power supply adopting a three-phase interleaved BUCK and open-loop full-bridge topology structure, characterized in that: Including: A power factor correction circuit, one end of which is connected to an external three-phase power supply for power correction; A BUCK circuit, one end of which is connected to the power factor correction circuit for achieving balanced distribution of input current and reducing output voltage ripple; A full-bridge circuit, one end of which is connected to the BUCK circuit for outputting a DC power supply; An electrolytic cell, connected to the full-bridge circuit to receive the DC power supply output by the full-bridge circuit for electrolytic hydrogen production.
2. The electrolytic water hydrogen production power supply adopting a three-phase interleaved BUCK and open-loop full-bridge topology structure according to claim 1, characterized in that: The power factor correction circuit is a three-phase three-level VIENNA active power factor correction circuit, specifically including: Phase A circuit, which includes inductor La, switching tubes ST1, ST2, ST3 and ST4. The switching tubes ST1, ST2, ST3 and ST4 all have a control end, a first end and a second end, and the control end controls the on / off between the first end and the second end. One end of the inductor La is connected to phase A of the external three-phase power. The first end of the switching tube ST1 is connected to the BUCK circuit. The second end of the switching tube ST1 is connected to the first end of the switching tube ST4. The second end of the switching tube ST4 is connected to the BUCK circuit. The second end of the switching tube ST1 is connected to the first end of the switching tube ST2. The second end of the switching tube ST2 is connected to the second end of the switching tube ST3. After the second end of the switching tube ST3 is connected with a capacitor Cp, it is connected to the BUCK circuit, and is also connected with a capacitor Cn and then connected to the second end of the switching tube ST4; Phase B circuit, which includes inductor Lb, switching tubes SS1, SS2, SS3 and SS4. The switching tubes SS1, SS2, SS3 and SS4 all have a control end, a first end and a second end, and the control end controls the on / off between the first end and the second end. One end of the inductor Lb is connected to phase B of the external three-phase power. The first end of the switching tube SS1 is connected to the BUCK circuit. The second end of the switching tube SS1 is connected to the first end of the switching tube SS4. The second end of the switching tube SS4 is connected to the BUCK circuit. The second end of the switching tube SS1 is connected to the first end of the switching tube SS2. The second end of the switching tube SS2 is connected to the second end of the switching tube SS3. After the second end of the switching tube SS3 is connected with a capacitor Cp, it is connected to the BUCK circuit, and is also connected with a capacitor Cn and then connected to the second end of the switching tube SS4; Phase C circuit, which includes inductor Lc, switching transistors SR1, SR2, SR3 and SR4. The switching transistors SR1, SR2, SR3 and SR4 all have a control terminal, a first terminal and a second terminal, and the control terminal controls the on / off between the first terminal and the second terminal. One end of the inductor LC is connected to Phase C of the external three-phase power supply. The first terminal of the switching transistor SR1 is connected to the BUCK circuit. The second terminal of the switching transistor SR1 is connected to the first terminal of the switching transistor SR4. The second terminal of the switching transistor SR4 is connected to the BUCK circuit. The second terminal of the switching transistor SR1 is connected to the first terminal of the switching transistor SR2. The second terminal of the switching transistor SR2 is connected to the second terminal of the switching transistor SR3. The second terminal of the switching transistor SR3 is connected to the capacitor Cp and then to the CUCK circuit, and is also connected to the capacitor Cn and then to the second terminal of the switching transistor SR4.
3. The electrolytic water hydrogen production power supply adopting a three-phase interleaved BUCK and open-loop full-bridge topology structure according to claim 1 or 2, characterized in that: The BUCK circuit is a three-phase interleaved BUCK circuit, which includes a Phase A loop, a Phase B loop and a Phase C loop. The Phase A loop, the Phase B loop and the Phase C loop have the same circuit structure. The Phase A loop includes: Switching transistor SBBH, which has a control terminal, a first terminal and a second terminal. The first terminal of the switching transistor SBBH is connected to the power factor correction circuit after being connected in parallel with the capacitor Cin and the capacitor C1. The second terminal of the switching transistor SBBH is connected to the inductor Lf and then connected in parallel with the capacitor C2 and then connected to the full-bridge circuit. Switching transistor SBBL, which has a control terminal, a first terminal and a second terminal. The first terminal of the switching transistor SBBL is connected to the second terminal of the switching transistor SBBH. The second terminal of the switching transistor SBBL is connected in parallel with the capacitor C2 and then connected to the full-bridge circuit.
4. The electrolytic water hydrogen production power supply adopting a three-phase interleaved BUCK and open-loop full-bridge topology structure according to claim 1 or 2, characterized in that: The full-bridge circuit is an open-loop full-bridge circuit, which includes a Phase A loop, a Phase B loop and a Phase C loop. The Phase A loop, the Phase B loop and the Phase C loop have the same circuit structure. The Phase A loop includes: The first full-bridge circuit, one end of which is connected to the BUCK circuit. The second full-bridge circuit, one end of which is connected to the transformer Np and then connected to the first full-bridge circuit, and the other end is connected in parallel with the capacitor Vo and then connected to the electrolytic cell. The third full-bridge circuit, one end of which is connected to the transformer Np and then connected to the first full-bridge circuit, and the other end is connected in parallel with the capacitor Vo and then connected to the electrolytic cell.
5. The electrolytic water hydrogen production power supply adopting a three-phase interleaved BUCK and open-loop full-bridge topology according to claim 4, characterized in that: The first full-bridge circuit includes switching transistors S1, S2, S3 and S4. The switching transistors S1, S2, S3 and S4 all have a control terminal, a first terminal and a second terminal. The first terminal of the switching transistor S1 is connected to the BUCK circuit, the second terminal is connected to the first terminal of the switching transistor S3, and is also connected to the transformer Np. The first terminal of the switching transistor S2 is connected to the first terminal of the switching transistor S1, the second terminal is connected to the first terminal of the switching transistor S4, and is also connected to the transformer Np. The second terminals of the switching transistors S3 and S4 are connected to each other and then connected to the BUCK circuit.