High-Efficiency Hydrogen Electrolysis Rectifiers: Powering Green Hydrogen Production

The relentless rise in carbon emissions is fueling climate instability, forcing a decisive pivot from fossil fuels to meet global net-zero pledges. Here, green hydrogen—created by using renewable energy to split water molecules—has emerged as a game-changer for sectors where batteries and direct electrification hit limits. Conventional options like grey hydrogen (produced from methane with unchecked emissions) and blue hydrogen (which captures only 60-90% of CO2) remain tethered to fossil infrastructure. Green hydrogen’s near-zero carbon output, however, unlocks cleaner pathways for overhauling power networks, decarbonizing cement and steel plants, and fueling cargo ships or trucks that renewables alone can’t electrify.

Production Methods & Challenges
Four electrolyzer technologies dominate:
Alkaline (ALK):
Mature and cost-effective but slow to adjust power input.
Solid Oxide (SOEC):
Exceptional energy efficiency offset by technical complexities.
Proton Exchange Membrane (PEM):
High efficiency and renewable-compatible, yet costly.
Anion Exchange Membrane (AEM):
Promising cost reductions but unproven at scale.
Frequently Asked Questions
Power System Requirements
Electrolysis demands specialized DC power conversion systems.
Key components include
Rectifiers (SCR/IGBT-based) for AC/DC conversion Voltage transformers Thermal management and control systems. SCR rectifiers suit large-scale operations, while IGBT systems offer precision for variable renewable inputs. Both aim to optimize energy efficiency and operational stability.
Strategic Implications
Three breakthroughs will make or break green hydrogen’s role in the climate fight: extending electrolyzer lifespans beyond 80,000 hours, slashing wind/solar power costs below $20/MWh, and standardizing modular power converters for mass deployment. Where other solutions falter—like replacing coal in steel furnaces or powering ammonia production—green hydrogen becomes the only viable fix. But scaling it demands more than tech upgrades: governments must phase out fossil subsidies, industries need shared infrastructure hubs, and investors should back pilot projects proving hydrogen’s cost parity with diesel and natural gas by 2035.

Hydrogen
It is also an important way to store energy.
Liyuan Haina’s innovative technology provides power systems for hydrogen processes in the hydrogen energy industry chain.
Electrolytic hydrogen production rectification products include SST Hydrogen Electrolysis Rectifier, IGBT Hydrogen Electrolysis Rectifier Series, Diode Rectification + IGBT Chopper Electrolysis Hydrogen Production Power Supply, DC-DC converter, Silicon-Controlled Rectifier for Hydrogen Electrolysis, PWM+IGBT Chopper Electrolysis Hydrogen Production Power Supply, which can provide a variety of rectification solutions.

Core Advantage
High efficiency, high regulation accuracy and stable output
The rectifier adopts multiple modules in parallel, with a small single module, low requirements for electronic components and low failure rate.
Multiple protection
The power supply has multiple protection functions such as overcurrent, phase loss, and over temperature.
Anti-corrosion, beautiful and long service life
The high-power rectifier basically overcomes the influence of eddy current heating of the large current magnetic field, so the loss is small and the service life is long.
Convenient installation
The circuit of the busbar is short, and the number of supporting points and joints of the busbar is small. Therefore, the installation is simple and convenient. During installation, construction personnel only need to stand on the concrete foundation platform to complete the installation of the power supply and busbar, without the need for scaffolding, and there is no risk of working at heights for construction personnel.
Application Scenarios of DC Power Supplies in Hydrogen Energy Industry Systems!

Liyuan Haina Electrolytic Hydrogen Product Series
Ⅰ. Low to Medium Power IGBT Hydrogen Electrolysis Rectifier Series
Liyuan Haina High-Power HF Switching Power Supply Technical Highlights:
The system employs a high-frequency rectifier circuit characterized by elevated inverter frequency, rapid control response, and superior equipment power factor.
Enhanced EMI mitigation is achieved through integrated filter reactors on unit input lines, effectively suppressing mutual interference between the grid and power supply.
Innovative modular architecture implements parallel-connected compact power modules, offering three key advantages: reduced component specifications, minimized failure rates, and simplified maintenance operations.
Critical technological breakthroughs address historical limitations of high-power HF switching systems:
1.Full-bridge phase-shifted soft-switching control methodology maximizes switching stress elimination;
2. Advanced logic interlock control circuitry prevents erroneous pulse triggering and bridge arm short-circuit failures;
3. Comprehensive magnetic bias suppression through dual approaches:
» Primary winding series DC-blocking capacitors in main transformers
» Automated magnetic deviation compensation circuitry
4.Multi-unit paralleling configuration with high-speed digital network control ensures two critical performance parameters:
» Signal integrity maintenance through interference attenuation
» Precise current sharing via independent voltage/current auto-calibration subsystems per module
Operational capabilities include:
» Direct compatibility with off-grid renewable hydrogen production (wind/solar)
» Real-time maximum power point tracking (MPPT) for optimized energy harvesting
» Microsecond-level fault protection mechanisms ensuring system reliability
» Adaptive power regulation maintaining >95% efficiency across load variations


Schematic of IGBT Hydrogen Electrolysis Rectifier
» Rectification principle: rectifier + inverter + transformer + rectifier
» Multi-module parallel mode
» With isolation transformer, good isolation
» The system accommodates three-phase AC input voltages across multiple standard levels: 220V, 380V, 415V, 480V, and compatible variants.
» Input frequency: 50HZ/60HZ
Ⅱ. High-power Hydrogen Electrolysis Rectifier

6 pulse rectifier
» Structure is simple
» Low cost
» Large harmonic content
» The transformer is a rectifier transformer

12 pulse rectifier
» Complex structure of multi-pulse rectifier
» The more pulse number, the more complex the structure and the
» higher the cost
» The higher the number of pulses, the lower the harmonic content
» The transformer is a rectifier transformer
18, 24, 36 pulse, etc
Ⅲ. Silicon-Controlled Rectifier for Hydrogen Electrolysis
» Select the core device thyristor with low on-state threshold voltage to reduce losses, improve efficiency and achieve stable overall performance;
» The number of parallel components of the bridge arm is controlled within a reasonable range,improve the current sharing coefficient of the rectifier bridge arm;
» Self-developed low-power current-sharing reactor to improve the efficiency Stable, safe, decades of technology, output voltage up to 1500V, current 100kA(or special customization);
» Multi-pulse modes such as 12, 24, and 36 can be used to reduce the impact of power supply system on power grid.


Ⅳ. PWM Hydrogen Electrolysis Rectifier
Basic composition: transformer + PWM rectifier
» High power factor, up to 0.99;
» Low harmonic, the harmonic current is less than or equal to 3%;
» The ripple coefficient is less than or equal to 3%.
Ⅴ. PWM + IGBT Chopper Electrolysis Hydrogen Production Power Supply
Basic composition: transformer + PWM rectifier + IGBT chopper
» High power factor, up to 0.99;
» High control accuracy, up to 0.2%;
» Low harmonic, the harmonic current is less than or equal to 3%;
» The ripple coefficient is less than or equal to 3%.


Ⅵ. Diode Rectification + IGBT Chopper Electrolysis Hydrogen Production Power Supply
Basic composition: rectifier transformer + diode rectification + IGBT chopper
» High power factor and low harmonics;
» IGBT chopper with redundant backup of independent units;
» The touch control system is convenient to track module faults and replace them in time;
» High efficiency, high adjustment accuracy and stable output.
Diode Rectification + IGBT Chopper Schematic
» Multi-pulse rectification has good harmonic control effect;
» IGBT chopper output current accuracy is high and ripple coefficient is good;
» Pre-stage rectification can use 6, 12, 18, 24, 36 pulse waves, etc.


Ⅶ. SST Hydrogen Electrolysis Rectifier
» SST solid-state transformer (power electronic transformer), which integrates electrical isolation, voltage conversion, and reactive power compensation;
» The integration and innovation of circuits and magnetic circuits, from medium voltage 10KV AC to 750V DC;
» Small harmonics and high power factor. Harmonic<5%, power factor ≥0.99;
» It can quickly match the power fluctuation characteristics of renewable energy, ensure the realization of 100% green hydrogen, and reduce hydrogen production costs;
» Stronger adaptability to grid voltage and frequency fluctuations;
» Small in size. The amount of equipment and engineering construction can be saved by 40%, and the floor space can be reduced by 30%;
» The efficiency of the power module is as high as 98%, and the architecture is simple and reliable.
Ⅷ. DC-DC Converter
» Directly connected to photovoltaic power generation or photovoltaic power storage system, reducing a large number of intermediate equipment;
» The overall cost of this part of the electrolytic hydrogen production power system is reduced;
» Converter modular design for easy replacement and maintenance; » Harmonic ≤ 5%;
» Strong adaptability to power grid fluctuations; » Volume and space advantages;
» Can be used with photovoltaic energy storage systems to produce hydrogen.

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Performance Comparison Table ↓
Liyuan Haina Performance Comparison Table of Hydrogen Production Power Supply by Electrolysis ( PDF-513K )
Get Product Catalog ↓
Hydrogen Electrolysis Rectifier Product Catalog: Advanced IGBT & SCR Solutions for Green Hydrogen Systems ( PDF-8.07MB )
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