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In the modern power electronics field, transformers are key devices for voltage conversion, electrical energy transmission, and distribution. Their performance directly affects the stable operation of the entire system. As a core structural component of transformers, the bobbin is like the framework of a building, playing a crucial role in the transformer's performance. Today, let's delve into the world of transformer bobbins and explore the mysteries of different types such as EF, EFD, ER, EE, POT, UU, EI, and PEE.

1. Basic Understanding of Bobbins

(1) Definition and Function of Bobbins

A bobbin, commonly known as a framework or spool in Chinese, is a key component in transformers used to support and wind coils. It not only provides physical support for the coils to ensure the accuracy of the coil's shape and position during winding but also serves as electrical isolation and insulation. This prevents short circuits between coils and between coils and the iron core, ensuring the safe and reliable operation of the transformer. Figuratively speaking, the bobbin is like the "skeleton" of the transformer, giving it its basic structural form while providing the necessary conditions for efficient electrical energy conversion.

(2).Overview of Bobbin Classification Methods

①.Classification by Magnetic Core Type: This is the most common classification method, as different magnetic core types correspond to different transformer application scenarios and performance requirements. Common types include EI, EE, EF, EPC, ER, RM, PQ, UU, etc. Each type can be further subdivided by magnetic core size, such as EE5, EE8, EE13, EE19, etc. This classification ensures that the bobbin of a high frequency electronic transformer can perfectly match a specific magnetic core, thereby maximizing the transformer's performance.

②.Classification by Shape: Bobbins can be divided into vertical and horizontal types based on shape. Vertical bobbins have pins perpendicular to the mounting plane and are typically used in compact spaces where vertical transformer installation is required, such as in power modules of small electronic devices. Horizontal bobbins have pins parallel to the mounting plane, occupying more horizontal space on the circuit board. However, they have advantages in applications with height restrictions, such as the bobbin of the PEE64 power adapter transformer in some flat-type power adapters.

③.Classification by Operating Frequency: Based on the transformer's operating frequency, bobbins can be categorized into high-frequency bobbins and low-frequency bobbins. Here, "frequency" refers to the number of periodic changes in the transformer during operation (measured in Hertz (Hz), often also in kilohertz (kHz), megahertz (MHz), or gigahertz (GHz)), not the number of uses. High-frequency bobbins are usually used in high-frequency transformers, such as the bobbin of the EE13 switching power supply transformer, with operating frequencies up to tens of kHz or even several MHz. The design and material selection of such bobbins must consider high-frequency characteristics, such as reducing high-frequency losses and improving insulation performance. Low-frequency bobbins are mainly used in low-frequency transformers, such as power frequency transformers, with typical operating frequencies of 50Hz or 60Hz. Low-frequency bobbins have relatively lower requirements for high-frequency characteristics but may have higher demands for mechanical strength and stability.

④.Classification by Pin Usage: Bobbins are divided into through-hole bobbins (DIP) and surface-mount bobbins (SMD) based on pin usage. Through-hole bobbins have long pins that can be directly inserted into the through-holes of the circuit board for soldering. This mounting method offers high mechanical strength and ease of maintenance and replacement but occupies more space on the circuit board. Surface-mount bobbins have short pins or use solder pads with Surface Mount Technology (SMT), allowing direct mounting on the surface of the circuit board. They have the advantages of small space occupation and suitability for high-density assembly, and are widely used in SMD-EFD20 home appliance transformer bobbins in modern home appliances.

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Email: sales008@mycoiltech.com

Whats app ID: +86 18788862885

Name：Alex~Mycoiltech

1.EF Type Bobbin

(1) Structural Features: The EF type Bobbin is shaped like a combination of the letters "E" and "F", typically featuring three or more pins, which are distributed on one or both sides of the Bobbin. Its magnetic core is E-shaped, with a wider central column and narrower side columns. This structural design enables better control of magnetic field distribution during coil winding, thereby improving the coupling efficiency of the transformer. EF type Bobbins come in various size specifications, with common ones including EF10, EF12, EF16, EF20, and EF25. Different sizes are suitable for transformers of different power levels. For instance, EF10 is applicable to transformers with lower power and is often used in power modules of small electronic products; while EF25 can be used in bobbins of high-power switching power supply transformers.

(2) Application Scenarios: EF type Bobbins are widely used in fields such as switching power supplies, DC-DC converters, AC-DC inverters, LED drivers, LCD power control, laptop power supplies, digital lighting, automotive navigation systems, and security systems. In these applications, EF type Bobbins, with their excellent magnetic field control capability and high power density, can effectively realize the conversion and transmission of electrical energy, meeting the power supply requirements of different devices. Taking the EF16 LED driver transformer as an example, the EF type Bobbin can be used to drive high-power LED lamp beads. By precisely controlling the parameters of the transformer, it achieves stable regulation of the LED current, ensuring the normal operation and long operational life of LED lamps.

(3). Performance Advantages: EF type Bobbins have high magnetic permeability, which allows them to achieve a large inductance in a small volume, thereby improving the power density of the transformer. Meanwhile, their structural design helps reduce leakage inductance and improve the efficiency of the transformer. In addition, EF type Bobbins have high versatility, with a variety of sizes and pin configurations available on the market, facilitating engineers to select and apply them according to different design requirements. Taking the EF20 electronic product charger transformer as an example, the transformer, relying on the three major advantages of the Bobbin—high magnetic permeability, low leakage inductance, and strong versatility—achieves a balance of volume, efficiency, and cost in the 10-18W portable fast-charging field, making it one of the core components in fast chargers for devices such as mobile phones and tablets.

2.Continuous updates...

3.Contact us today to explore bulk orders or request technical specifications.

Email: sales008@mycoiltech.com

Whats app ID: +86 18788862885

Name：Alex~Mycoiltech

ER-Type Bobbin:Structure, Application Scenarios and Performance Advantages

1. Structural Features

The magnetic core of the ER-type Bobbin is E-shaped, but its appearance is different from that of EF-type and EFD-type bobbins. The magnetic core of the ER-type Bobbin is usually relatively flat, with the height of the middle column and side columns being relatively low. This design allows the ER-type Bobbin to occupy less space in the vertical direction, making it more suitable for application scenarios with height restrictions.

The number and layout of pins of the ER-type Bobbin vary according to different models and application requirements. The common types include through-hole type and surface-mount type (SMD), such as the ER35 transformer bobbin and SMD-ER11.5 switching power supply transformer. Its size specifications include ER8, ER10, ER12, ER16, ER20, etc. ER-type Bobbins of different sizes are suitable for transformers with different power and space requirements.

2. Application Scenarios

ER-type Bobbins are often used in fields such as ER28 DC-DC conversion transformers, switching power supplies, and high-frequency transformers. They are especially widely applied in miniaturized electronic products that have strict requirements on the volume and height of transformers.

For example, in portable power supply devices like mobile phone chargers and tablet chargers, the ER-type Bobbin, relying on its flat structural design, can achieve efficient power conversion in limited space, meeting the miniaturization and high-performance requirements of devices for power supplies.

3. Performance Advantages

The flat structural design of the ER-type Bobbin enables it to have lower winding resistance and inductive loss in high-frequency electronic transformer applications, which can effectively improve the high-frequency performance and efficiency of transformers.

At the same time, due to its compact size, it can save space in miniaturized electronic products, which is conducive to realizing the slim and lightweight design of products.

In addition, the ER-type Bobbin also has strong versatility. There are various sizes and pin configurations available on the market, facilitating engineers in design and component selection.

4.Contact us today to explore bulk orders or request technical specifications.

Email: sales008@mycoiltech.com

Whats app ID: +86 18788862885

Name：Alex~Mycoiltech

In the composition of a transformer, the bobbin (framework) is rarely mentioned as frequently as the coil or magnetic core, yet it is a key component ensuring the stable operation of transformers. It not only undertakes the important responsibility of fixing the coil but also serves as a core barrier for isolating high and low voltages and resisting high-temperature erosion. The selection of bobbin materials directly affects the safety, stability, and service life of transformers. Today, we focus on our company's exclusive material solutions for products — from selection standards to quality control details, we will comprehensively explain how our company builds product competitiveness with high-quality materials.

I. Our Star Products: Precise Material-Scenario Matching Cases

The bobbin material for each transformer model of our company is the closed-loop outcome of "scenario demand → material R&D → testing and verification → mass application". The following three star products’ material solutions can intuitively demonstrate our company's customized advantages:

1. EE16 High-Frequency Transformer: Exclusive PHENOLIC Bobbin, a Stable Choice for Industrial High-Frequency Scenarios

The EE16 high-frequency transformer focuses on industrial control power supplies and small inverters. It needs to operate continuously under high frequency (20kHz-100kHz) and high voltage (1kV-3kV). Our company exclusively equips it with a customized phenolic resin bobbin:

Material Adaptability: For high-frequency working conditions, the dielectric loss of the phenolic resin is strictly controlled below 0.008, avoiding temperature rise caused by dielectric loss heating under high frequency (the measured hot-spot temperature of the transformer is reduced by 5-8℃); the breakdown voltage of 18kV/mm can cope with occasional voltage fluctuations in industrial scenarios and eliminate the risk of electric leakage.

Practical Application Value: The EE16 transformer equipped with this exclusive phenolic bobbin can operate stably for 6 consecutive years in industrial control cabinets (the industry average is 4 years), with a failure rate as low as 0.3%. It has become a designated supporting product for over 30 industrial equipment manufacturers.

2. GU25 Pot-Type Transformer bobbin: Exclusive PA66 Bobbin, a Durable Option for Automotive Scenarios

The GU25 pot-type transformer focuses on on-board power supplies and smart home controllers. It needs to withstand continuous vibration (5-500Hz) during vehicle operation and installation impacts. Our company equips it with an exclusive nylon 66 (PA66) bobbin reinforced with 25% glass fiber:

Material Adaptability: The 25% glass fiber formula enables the bobbin to have an impact strength of 8kJ/m². After the on-board vibration test (50Hz/2g acceleration for 100 hours), the structure remains undistorted and the pins do not loosen; the heat distortion temperature of 260℃ can cope with the instantaneous high temperature of 120℃ in the on-board environment and prevent the bobbin from softening.

Practical Application Value: This GU25 transformer has passed the IATF16949 automotive electronics certification and is compatible with on-board OBC (On-Board Charger) of over 10 automobile manufacturers. In the -40℃~85℃ high-low temperature cycle test, the insulation performance retention rate is 100%, meeting the strict requirements of automotive electronics.

3. EFD20 Flyback Transformer bobbin: Exclusive PM-9630 Bobbin, an Efficiency Expert for Thin-Scenarios

The EFD20 flyback transformer focuses on laptop chargers and LED driver power supplies. It needs to achieve a thin design (thickness <12mm) while bearing a power density of 10W-60W. Our company equips it with a customized modified PM-9630 bobbin:

Material Adaptability: The modified PM-9630 has a flexural strength of 85MPa even in a 0.8mm thin-walled state, without cracking during winding; its optimized fluidity enables precise molding of the thin slot structure of the EFD20, controlling the overall thickness of the transformer at 11.5mm (the industry average for similar products is 13mm). Meanwhile, its long-term temperature resistance of 150℃ can cope with the hot-spot temperature of 140℃ of the flyback transformer.

Practical Application Value: The EFD20 transformer equipped with this bobbin is compatible with laptop chargers of over 5 consumer electronics brands. When operating at full power of 60W, its temperature rise is 6℃ lower than that of similar industry products, and it meets the UL 94 V-0 flame retardant standard, achieving both thinness and safety.

II. Our Material Advantages: Controlling from the Source to Create Value for Customers

Our company's core competitiveness in bobbin materials lies not merely in selecting high-quality materials, but in establishing a complete system of "material R&D - source traceability - full-process quality control":

Exclusive R&D Capability: We have established a material R&D laboratory and customize material formulas for different product scenarios (such as low-dielectric-loss phenolic resin for EE16 and modified PM-9630 for EFD20), breaking the industry pain point of "general materials being used for all scenarios".

Source Traceability Management: We establish traceability files for each batch of materials, recording supplier qualifications, material batch numbers, and performance parameters to ensure materials are traceable and accountable.

Full-Process Quality Control: From raw material warehousing (sampling and performance testing) → production process (real-time monitoring of molding parameters) → finished product delivery (100% appearance inspection + 10% performance sampling inspection), each link is controlled in accordance with standards higher than the industry average to ensure the stable material quality of the final products.

Choosing a transformer essentially means choosing "material reliability". Our company has always adhered to the belief that "high-quality materials create high-quality products". Through exclusive customized bobbin material solutions, we provide customers in different scenarios with transformer products that are "more stable, more durable, and more adaptable".

Before cooperation, we can provide customers with test samples. Of course, we also offer product customization services. Feel free to contact us if you have any needs.

Contact us today to explore bulk orders or request technical specifications.

Email: sales008@mycoiltech.com

Whats app ID: +86 18788862885

Name：Alex~Mycoiltech

Can the Wireless WiFi TUYA Access Control System Function Stably in Harsh Outdoor Environments?

The Wireless WiFi TUYA Access Control System is engineered to operate reliably in challenging outdoor conditions, including high temperatures, humidity, and dusty environments. Its robust design and advanced features ensure consistent performance for both residential and commercial applications. Here’s a detailed breakdown of its capabilities and protection levels:

The system is built to withstand extreme temperatures, with most models supporting an operational range of -30°C to +60°C. This makes it suitable for regions with scorching summers or freezing winters.
Humidity Tolerance:It functions seamlessly in environments with 0% to 98% humidity, thanks to its sealed internal components and corrosion-resistant materials.
Dust and Debris Protection:A tightly sealed housing prevents dust ingress, ensuring long-term durability even in construction sites or areas with high airborne particulates.

Protection Level: IP66 Rating
The system holds an IP66 certification, a globally recognized standard for environmental protection:
IP6X (Dust Protection):The highest dust resistance rating, ensuring no particles can penetrate the device.
IPX6 (Water Protection):Withstands powerful water jets from any direction, making it suitable for heavy rain or pressure washing.

Key Features for Outdoor Use
Weatherproof Construction: Zinc alloy or aluminum alloy casings, combined with epoxy encapsulation, protect against rust, UV damage, and physical impacts.
Anti-Pry and Vandal-Resistant: Reinforced screws and durable materials deter tampering, ideal for public spaces.
Multi-Environment Compatibility: Works with various outdoor setups like garages, warehouses, and hotel entrances, supporting doorbell integration and electric locks.

User-Friendly Design
Touch Keypad with Backlight: Easy-to-use even in low-light conditions.
Remote Management via TUYA App: Monitor access logs, grant temporary codes, and control the system from anywhere.
Multiple Unlocking Methods: Supports fingerprint, RFID cards, PIN codes, and app-based access for added convenience.

Ideal Application
From securing residential gates to managing commercial premises, the TUYA system adapts to diverse outdoor scenarios while maintaining high security standards. Its combination of IP66 protection and smart connectivity ensures peace of mind in harsh weather or challenging environments.

For specific model details or installation guidance, consult the product manual or contact our S4A support team.

Author: Written by Ms.Anna Zhang from S4A INDUSTRIAL CO., LIMITED

How is the compatibility between the Tuya switch and existing traditional lamps at home? Will problems such as stroboscopic or inability to control occur?

Is the installation of the Tuya Exit button complicated? Can ordinary users complete the installation by themselves? What are the precautions during the installation process?

The Tuya Exit Button is crafted for straightforward installation. Regular users can put it in place without the need for professional help.

The installation process typically consists of these steps:

Mounting the Button: You can use screws or adhesive to attach the button to a wall or door frame.
Connecting Wires: It involves making connections to the access control device or door strike.
Testing the Functionality: Ensuring that the button can unlock the door as intended.
2. DIY Installation Feasibility
Yes, most users can install it on their own by following these steps:
Gather Necessary Tools: You'll need a screwdriver, wire strippers, and a voltage tester.
Refer to the Manual: The included manual offers clear, step - by - step instructions.
Understand the Wiring: It usually has two wires for triggering the door release.
3. Installation Precautions
A. Electrical Safety
Turn Off the Power: Before starting the installation, disconnect the power supply to the access control system.
Check the Voltage: Make sure the voltage matches the requirements of the exit button.
B. Proper Wiring
Avoid Short Circuits: Use wire connectors to insulate the exposed parts of the wires.
Label the Wires: Clearly mark the wires according to the system diagram.
C. Physical Installation
Choose the Right Location: Install the button at a height of 1.2 - 1.5 meters for easy access.
Ensure Stability: Secure the button firmly to prevent it from shaking or coming loose.
D. Waterproofing (for Outdoor Use)
Use Sealants: Apply silicone sealant around the edges of the button if it's going to be installed outdoors.
Opt for IP66 Models: Select weatherproof models for outdoor installations.
E. System Compatibility
Verify Compatibility: Confirm that the exit button is compatible with your Tuya access control system.
Update Firmware: Keep the firmware of the access control panel up - to - date.
4. Troubleshooting Tips
Non - Responsive Button: Check the wiring connections and the power supply.
Intermittent Operation: Tighten the screws and clean the contact points.
Unexpected Locking: Review the system settings for any anti - passback configurations.
5. When to Seek Professional Help
Complex Systems: If you're dealing with multi - door systems or advanced access control setups, it's best to consult a professional.

Warranty Concerns: Improper installation may void the warranty, so seek professional help if you're unsure.

User - Friendly Design: The intuitive layout simplifies the installation process.
Versatile Compatibility: It can work with various Tuya access control devices.

Durable Construction: Made from flame - retardant materials, ensuring long - lasting use.

By following these guidelines, you can safely and efficiently install the S4A Tuya Exit Button and enjoy seamless access control. For more detailed information, visit S4A factory's Installation Guide or get in touch with S4A support team.

Author: Written by Ms.Anna Zhang from S4A INDUSTRIAL CO., LIMITED

What are the fingerprint recognition speed and accuracy of the Tuya WiFi Smart Door Lock? And what is the approximate failure rate of recognition?

When the battery level of the Tuya Smart Lock Door Fingerprint Lock is low, what reminder methods are there? Does it support emergency charging? And where is the emergency charging interface?

Visual Indicator: A rapid red light flash activates when battery capacity drops below 20%
Audible Alarm: An intermittent beeping sound will trigger
App Notification: Both Tuya Smart and Smart Life apps send push alerts to administrators
Voice Prompt: Some models include voice reminders in multiple languages
These redundant systems ensure users receive timely warnings even if the lock is installed in noisy or low-traffic areas.
2. Emergency Charging Capability
All Tuya fingerprint locks support emergency charging to prevent lockouts:
Power Source: Any standard 5V USB power bank or phone charger can be used
Charging Time: Typically provides enough power for 10-15 unlocks after 5-10 minutes of charging
Compatibility: Works with all major battery types (AA, AAA, CR123A)
This feature ensures access continuity even in unexpected situations like complete battery depletion.
3. Charging Port Location
The USB charging interface is strategically placed for easy access:
Handle-Mounted: Most models feature a discreet port at the base of the door handle
Side Panel: Some slimline designs locate the port on the lock's side panel
Weatherproof Protection: Outdoor-rated models include rubber seals to protect against water ingress
Always use the provided rubber cover to maintain IP ratings after charging.
4. Proactive Battery Management Tips
To maximize battery life:
Replace batteries when the 20% alert triggers
Use high-quality alkaline batteries (not rechargeable)
Enable power-saving mode in the app settings
Avoid frequent unnecessary app connections
Regularly clean the fingerprint sensor to reduce recognition attempts
5. Model-Specific Notes
USB Port Type: Newer models use USB-C (check product specifications)
Battery Capacity: Average lifespan ranges from 8-18 months depending on usage

Backup Key: All models include a mechanical key override as standard

For exact specifications, refer to your lock's user manual or check the product page on Tuya's official website. The combination of multi-modal alerts, emergency charging, and intuitive design ensures reliable operation even in.

Author: Written by Ms.Anna Zhang from S4A INDUSTRIAL CO., LIMITED