* Product Parameters
Operating frequency:10kHz-500KHz Operating temperature:-40℃ to +125℃ Storage temperature:-25℃ to +85℃ Storage humidity:30 to 95%
* Features The EE65 transformer, thanks to itsLarge power capacity, good high-frequency performance and design flexibilityIt has become one of the mainstream choices for medium and high power switching power supplies.
* Typical application areas Switching power supplyMedium and high power AC-DC and DC-DC converters. New energy systemHigh-frequency isolation transformers in photovoltaic inverters and energy storage converters. Industrial equipmentMotor drive, welding machine power supply, induction heating power supply. Communication infrastructureBase station power supply, server power supply.
* Product Standards UL, RoHS, 3C,CQC
* Size Specifications 
Type | Structure
Tурe | Dimension（mm） | Pin Row （mm） | Row Pitch（mm） | OD Pin（mm） | note | A | B | C | Pin | E | F | EE65-001 | Vertical | 66.0 | 55.0 | 65.0 | 10+6 | 5.0/8.0/24.5 | 45.5 | Φ1.3 |
| EE65-002 | Horizontal | 67.0 | 67.0 | 81 | 8+8 | 5.0 | 45.0 | Φ1.0 |
| EE65-003 | Horizontal | 67.0 | 67.0 | 65 | 8+8 | 5.0 | 45.0 | Φ1.0 |
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*The above are commonly used skeleton styles for the company.,Other styles are not included.,Inquiries are welcome. Our company can customize various specifications according to customer requirements.High-frequency transformer.
EE65 Transformer Core Electrical Parameters The EE65 transformer is a classic choice for medium to high-power applications. The "65" indicates that the width of the core is approximately 65mm. Below are its detailed core electrical parameters (based on the core itself) and typical application characteristics. I. Key Core Body Parameters (Using Common Materials like PC40/PC47 or PC95 as Examples) These are the fundamental geometric and material parameters for the electromagnetic design of an EE65 core. Parameter | Symbol | Typical Value (e.g., PC40 Material) | Physical Meaning & Design Impact | Effective Cross-sectional Area | Ae | ~535 mm² | Core parameter. A very large area means a single turn can handle a higher volt-second product, or fewer turns are needed for the same ΔB. Directly determines the transformer's power handling capability. | (Varies between manufacturers, e.g., 535-560mm²) | Window Area | Aw | ~478 mm² | Core parameter. A spacious window allows the use of thick wire, multi-strand wire, or copper foil for high-current windings, and can accommodate complex multi-winding and reinforced insulation structures. | Effective Magnetic Path Length | le | ~151 mm | Used to calculate magnetic reluctance, core loss, and magnetic field strength. | Inductance Factor (Ungapped) | AL | Approx. 8000 nH/N² or higher | Inductance per turn squared without an air gap. In practical use (especially for flyback or energy-storage inductors), an air gap must be introduced, significantly reducing the AL value to the design target (e.g., a few hundred nH/N²). | Saturation Flux Density | Bsat | ~390 mT (100°C, PC40) | Absolute upper limit of the core. The design working flux density ΔB must have sufficient margin to prevent saturation. For topologies with DC bias (e.g., flyback), ΔB selection needs to be more conservative. | ~470 mT (100°C, PC95) | AP Value (Area Product) | AP=Ae*Aw | ~256,000 mm⁴ | Comprehensive geometric factor for evaluating core power capability. A larger AP value theoretically allows for greater power transfer. | Curie Temperature | Tc | > 215°C (PC40) | Material property; the actual operating temperature should be well below this value. | > 210°C (PC95) |
II. Typical Transformer Performance Parameters Based on EE65 Core The performance of a transformer designed with an EE65 core depends on topology, frequency, and heat dissipation.
Power Capacity Range
Operating Frequency Range
Recommended Range: 20kHz ~ 150kHz (PC40 material)
High-Frequency Applications: If using low-loss materials like PC95, the operating frequency can be increased to 150kHz ~ 500kHz, especially suitable for LLC resonant converters to achieve higher power density.
Winding Design Characteristics
High Current Capability: Benefiting from the large window, secondary windings can use copper foil or multiple thick wires in parallel to reduce skin effect losses and meet high-current requirements.
Multiple Windings & Complex Structures: Facilitates the winding of multiple secondaries (e.g., multi-output power supplies) or designing reinforced insulation structures required for safety certifications (e.g., IEC/EN/UL) using barriers, triple-insulated wire, insulating tape, etc.
Low Copper Loss Potential: Sufficient space allows for conductors with larger cross-sectional areas, reducing winding resistance and copper loss.
Typical Topology Applications
Full-Bridge/Half-Bridge Converters: Medium-high power industrial supplies, telecom power supplies.
LLC Resonant Converters: High-efficiency server power supplies, LCD TV power supplies, high-end chargers.
High-Power Forward Converters: Motor drives, specialty power supplies.
Drive transformers in three-phase inverters.
III. Key Design Points and Considerations
Air Gap Design is Crucial:
For flyback topologies, the air gap is key for energy storage and must be precisely calculated.
For forward topologies or LLC transformers, a small air gap is sometimes needed to reduce remanence or adjust inductance, but the EE65 is more often used for the latter and may not require a large gap.
Air gaps cause fringing flux, which can lead to additional eddy current losses (proximity loss) in the windings. This must be considered in the winding process (e.g., using layered winding, Litz wire).
Heat Dissipation is the Core Challenge:
When handling kilowatt-level power, even with high efficiency (e.g., 95%), tens of watts of loss are still converted to heat.
Design must simultaneously optimize core loss (related to ΔB, frequency, material) and winding copper loss.
Typically requires heatsinks, thermal paste/compound, or forced air cooling.
Manufacturing and Safety Regulations:
The winding process for high-power transformers is complex, demanding high consistency and insulation reliability.
Pins or terminals need to handle high current.
Safety regulations must be strictly followed to ensure sufficient creepage and clearance distances.
Material Selection:
Standard Applications (<100kHz): PC40/PC44 offer good cost-performance.
High-Frequency, High-Efficiency Applications (>100kHz): PC95 (or equivalent) material is a better choice. Its high-frequency loss is significantly lower than PC40. Although slightly more costly, it effectively reduces temperature rise and improves efficiency.
EE65 Transformer The EE65 transformer is a commonly used ferrite core transformer in the field of power electronics. Its model name is derived from the geometric shape and size of its core. The following are the main characteristics of the EE65 transformer: 1. Structural Features
Core Shape: Utilizes a standard "E"-type ferrite core, formed by assembling two "E"-shaped cores together, with an optional air gap introduced in the middle.
Size Specification: The "65" in EE65 indicates that the width of the core is approximately 65mm (specific dimensions may vary slightly by manufacturer). It belongs to the medium-to-large size core category, featuring a relatively large cross-sectional area (Ae) and window area (Aw), making it suitable for medium- to high-power applications.
Flexible Assembly: The inductance can be adjusted by modifying the core air gap, meeting the requirements of different topologies (such as flyback, forward, half-bridge, etc.).
2. Electrical Performance Characteristics
High Power Capacity: Due to its larger core size, the EE65 transformer is typically used for power levels ranging from several hundred watts to several kilowatts. It is commonly found in industrial power supplies, telecommunications power supplies, photovoltaic inverters, and other fields.
Excellent High-Frequency Characteristics: Ferrite materials (such as PC40, PC95, etc.) offer low-loss properties, making them suitable for high-frequency operation (typically from tens of kHz to hundreds of kHz). This effectively reduces the transformer's size and weight.
Temperature Rise Control: The larger surface area aids in reducing temperature rise. Thermal performance can be further improved through proper winding design and heat dissipation methods.
3. Design Flexibility
Large Winding Space: The EE65 has a relatively large window area, which can accommodate multiple windings, thicker wire gauges, or copper foil. This makes it suitable for multi-output or high-current designs.
High Customizability: Core materials can be selected based on requirements (e.g., high-frequency low-loss type, high Bsat type). Parameters such as turns ratio and insulation class can be flexibly designed.
EE65 Transformer The EE65 transformer, leveraging its high power capacity, excellent high-frequency performance, and outstanding thermal stability, is widely used in fields demanding high power and reliability. The following details its main application areas: 1. Industrial Power Supplies and Automation Equipment This is one of the core application areas for the EE65.
High-Power Switch-Mode Power Supplies: Used in power supply units for CNC machine tools, laser cutting machines, and industrial robot control systems, typically in the power range of 500W to 3000W.
Motor Drives and Servo Amplifiers: Serving as a key component for isolation and energy transfer, used in the DC-DC isolated power supply sections of frequency converters and servo drives.
Welding Machine Power Supplies: In inverter-based welders, the EE65 is commonly used in the main power conversion stage, handling high-current, high-power output.
Uninterruptible Power Supplies (UPS): Used as the main transformer in the DC-AC inverter or PFC stage of online UPS systems.
2. Telecommunications and Data Center Infrastructure Require extremely high efficiency and power density.
Telecommunications Base Station Power Supplies: Provide 48V to multiple isolated power rails for 4G/5G base station radio units and processing units.
Server Power Supplies: In high-end Gold or Platinum efficiency server power supplies (e.g., with output power of 1000W to 2000W), the EE65 is often used as the resonant transformer or main transformer in LLC resonant converters, enabling high-efficiency DC-DC conversion.
Optical Communication Equipment Power Supplies: Provide highly reliable isolated power for transmission equipment.
3. New Energy and Power Electronics
Photovoltaic (PV) Inverters: Used in the isolated boost stage or auxiliary power sections of string-type or small/medium-sized centralized PV inverters.
Energy Storage Converters (PCS): Used in the bidirectional DC-AC conversion stage of battery energy storage systems.
Charging Modules: Found within AC-DC power modules inside electric vehicle DC fast charging piles (e.g., 15kW to 30kW modules often use multiple EE65 transformers in parallel or for different power stages).
Wind Power Converters: Auxiliary power supply systems.
4. Specialized Power Supplies and High-End Equipment
Medical Equipment Power Supplies: Such as power supplies for high-voltage generators in large X-ray machines and CT scanners, requiring extremely high safety isolation and stability.
Broadcast Transmitter Power Supplies: Provide power for high-power RF amplifiers.
Scientific Research Instrument Power Supplies: Require precise, stable, low-noise high-power supplies.
Induction Heating Power Supplies: Used as the main transformer in medium-frequency power supplies.
5. High-End Consumer Products
High-End Audio Amplifier Power Supplies: Provide clean, ample power for high-power Hi-End Class D audio amplifiers.
High-Power LED Driver Power Supplies: Used for stage lighting, large display screens, plant factory lighting, etc.
High-Power LCD/Laser TV Power Supplies: Especially the main power supplies for TVs larger than 65 inches.
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