2026-09-01
An analysis from three angles: industry demand, equipment structure, and filter design principles
Yanbixin Technology | Power Supply Filters | Guangdong
AI Server Liquid Cooling | EMC Compliance | Power Filter for CDU
The AI computing boom is driving explosive demand for liquid cooling equipment. China is one of the world's key suppliers, and a large share of its liquid cooling products are exported overseas. This article analyzes why power filters are essential in liquid cooling equipment from three angles: industry demand, AI servers' extreme stability requirements, and the technical structure of liquid cooling systems. It also summarizes the core design requirements these applications place on power filters.
• Liquid cooling penetration is climbing from about 15% (2024) to over 50% (2027), as single AI racks now draw more than 120 kW.
• Data centers target 99.99% or higher availability — for liquid cooling equipment, one interference event can mean minutes of downtime and major financial loss.
• VFD-driven pumps and compressors create conducted noise (150 kHz–30 MHz) and harmonic current; both need dedicated filtering.
• Export markets demand CE compliance (EN 55014, EN 61000-3-2), FCC Part 15 (US) and, for VFD applications, IEC/EN 61800-3.
• Yanbixin's liquid cooling filter series combines three-phase high-current design, low leakage current and full export certifications.
Power consumption per AI server rack keeps climbing. Take the NVIDIA GB200 NVL72 as an example: a single rack draws more than 120 kW. Traditional air cooling can no longer handle the heat. Liquid cooling penetration is accelerating from about 15% in 2024 to over 50% by 2027. Liquid cooling has moved from a “nice-to-have option” to a “must-have” for high-density AI clusters.
• The global coolant distribution unit (CDU) market was worth about USD 2.24 billion in 2025. It is expected to reach USD 7.38 billion by 2034, growing at a CAGR of about 14.3% (source: Fortune Business Insights, July 2026).
• The global data center liquid cooling market was about USD 4.58 billion in 2025. It is projected to exceed USD 44 billion by 2035, growing at a CAGR of over 25% (source: Research Nester, September 2025).
• In China, the liquid cooling server market reached about USD 2.37 billion in 2024, up 67% year on year (source: IDC, April 2025). Cold-plate liquid cooling penetration is rising fast.
On the supply side, the world's main CDU and liquid cooling equipment suppliers include international players such as Schneider Electric, Vertiv, Delta Electronics, nVent, CoolIT Systems and Motivair. Chinese manufacturers, meanwhile, already have a complete cold-plate liquid cooling supply chain, and large volumes of complete systems and components are exported to North America, Europe and Southeast Asia. International tier-one suppliers typically require components to meet strict EMC and reliability specifications — and this requirement is now passing down the supply chain to Chinese component makers.
Liquid cooling equipment serves the most critical infrastructure in a data center. Its reliability requirements go far beyond consumer products:
• Availability targets: mainstream data centers aim for Tier III/IV levels, with operating availability of 99.99% (“four nines”) or even 99.999% (“five nines”) (Uptime Institute classification). Downtime is measured in minutes per year.
• Liquid cooling is the server's lifeline: if a circulation pump or coolant distribution unit (CDU) fails, server temperature rises quickly, forcing frequency throttling or even shutdown — affecting an entire rack or even a whole server room.
• Interference costs more: electromagnetic interference can make control signals misbehave, sensor readings drift, and variable frequency drives report false faults. In a consumer device, one interference event might just mean a restart. In a data center, it means business interruption and heavy financial loss.
• A sensitive shared environment: liquid cooling equipment shares the same power distribution system as high-density servers, storage and network equipment. Any noise the equipment generates travels along the power lines into other devices on the same circuit.
Liquid cooling equipment must therefore do three things at once: meet its own electromagnetic emission limits, resist interference from the environment, and avoid polluting the data center's power supply. EMC is no longer just a “test item” — it is the entry ticket to tier-one customer supply chains.
The electrical structure of a liquid cooling system determines its electromagnetic behavior. Core loads such as circulation pumps, cooling fans and compressors typically use variable frequency drives (VFDs, or PWM speed control) to adjust flow and cooling capacity on demand. VFDs deliver efficient control, but they also create two classic EMC problems:
• Conducted noise: PWM high-frequency switching generates broadband noise on the power lines, typically in the 150 kHz–30 MHz band. A power filter at the equipment input is needed to suppress it.
• Harmonic current: a VFD is a typical non-linear load. It injects harmonic currents into the power grid, which can distort voltage and disturb other sensitive equipment on the same power distribution system. Reactors or harmonic filtering are usually required to control it.
For liquid cooling applications, filter design should focus on the following principles and key points:
• Split the work: high-frequency conducted noise is handled by the filter network (common-mode and differential-mode suppression); low-frequency harmonics are handled by reactor-type components. The two work differently and must be designed together.
• High current and three-phase: liquid cooling equipment runs at high power levels. The filter must cover large rated currents and three-phase distribution, while balancing size and loss.
• Leakage current control: data centers are sensitive to leakage current. Filter design must balance filtering performance against leakage current — an approach similar to low-leakage designs in medical equipment filters.
• Reliability and temperature rise: liquid cooling equipment runs 24/7. Filters must be designed for long-term temperature rise, component life and safety margins, so they never become the next failure point.
• Standards compliance: for export to Europe, equipment must meet EMC directive standards under the CE framework (such as the EN 55014 series and EN 61000-3-2 harmonic limits). For the US market, FCC Part 15 applies. VFD-based applications may also involve IEC/EN 61800-3.
Based on our understanding of liquid cooling EMC behavior and data center reliability requirements, Yanbixin has developed a dedicated power filter series for the liquid cooling industry. The design maps directly to the key requirements above:
• Targeted design for VFD-driven loads (pumps, compressors, fans), covering both conducted noise suppression and harmonic control.
• Three-phase, high-current ratings that match the power structure of CDUs and cooling units.
• A balance of compact size and cost, suitable for volume integration by equipment manufacturers (OEMs).
• Certified to UL, TÜV, CQC, CE, RoHS and REACH, covering mainstream export markets.
• Backed by 20 years of filter R&D and manufacturing experience, with free EMC testing and remediation support. We optimize the solution based on measured data, helping equipment makers pass certification faster and enter tier-one supply chains.
The market window for AI liquid cooling equipment is opening fast, and EMC compliance plus reliability is the ticket into overseas tier-one supply chains. Building the filter solution into the equipment architecture at the design stage is more economical and more controllable than fixing problems after tests fail.
[Disclaimer: Some content and accompanying images in this article are sourced from the internet and are intended solely for educational and exchange purposes. If there is any infringement, please contact us for removal; thank you!]
Shenzhen Yanbixin Technology Co., Ltd. is a national high-tech enterprise that integrates the research, development, production, EMC & EMI FILTER products.
Over more than ten years of hard work by our team, our products have successively obtained multiple certifications and patents, including cUL/UL, TUV, CQC, CE, CB, ENEC, ROHS, and REACH. We offer a wide range of products with complete specifications, and to ensure quality, we strictly follow the GJB9001C-2017 military standard system in production.
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