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.

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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

Rising Demand for EPR in the U.S. Research Market

In recent years, electron paramagnetic resonance (EPR) spectroscopy has gained renewed attention across U.S. research institutions. From studying free radicals in chemistry labs to analyzing defects in battery and catalyst materials, EPR offers unique insights that other spectroscopic techniques cannot easily deliver.

As more researchers look to adopt or upgrade their EPR systems, one question comes up frequently:
“How much does an EPR spectrometer cost in the U.S. today?”

If you plan to purchase in 2025, understanding the current price range and technology landscape can help you make an informed investment decision.

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EPR Spectrometer Price Overview in the U.S. (2025 Update)

EPR prices vary widely depending on system type, frequency band, and included accessories. Here is a general look at what U.S. buyers can expect in 2025:

Several factors affect pricing, including magnet design (permanent or electromagnet), cryogenic requirements, and optional modules such as variable temperature units or rapid scan capabilities.

For many chemistry, materials, and teaching labs, a compact X-band Benchtop EPR already covers most research needs at a fraction of the traditional cost.

Benchtop EPR Spectrometer

Why U.S. Researchers Are Turning to Benchtop EPR

Benchtop EPR spectrometers have become increasingly popular in the U.S., particularly among universities, start-ups, and multi-user core facilities. The reasons are clear:

• Compact design: fits easily on a standard lab bench, no need for a dedicated EPR room.

• Low maintenance: no cryogen handling or large cooling systems required.

• Easy operation: intuitive software allows even non-specialists to collect reliable spectra.

• Cost efficiency: significant savings in both purchase price and long-term service costs.

In other words, Benchtop EPR systems make advanced spectroscopy accessible to more researchers than ever before.

CIQTEK’s Competitive Edge: Best Price for X-band EPR

As a technology-driven scientific instrument manufacturer, CIQTEK has focused on combining performance, affordability, and usability in its EPR lineup.

The CIQTEK Benchtop EPR Spectrometer delivers true X-band performance in a portable desktop configuration, ideal for both research and teaching labs.

Key advantages include:

• High sensitivity and magnetic field stability for accurate signal detection.

• Full-featured software for easy experiment setup and data analysis.

• Compact footprint and quiet operation.

• Dedicated global service and support, including growing coverage in the U.S. and worldwide.

CIQTEK’s mission is to make high-end spectroscopy accessible to every research lab, not just large facilities with extensive budgets.

Read more about CIQTEK EPR customer stories.

CIQTEK Benchtop EPR Spectrometer at Cornell University

Affordable Does Not Mean Basic: Balancing Cost and Capability

Historically, researchers had to choose between performance and affordability when purchasing an EPR spectrometer.
That trade-off is rapidly disappearing.

Modern Benchtop EPR systems, such as CIQTEK’s. use advanced digital control, stable permanent magnets, and optimized microwave design to deliver the signal-to-noise ratio, stability, and reproducibility once found only in full-size instruments.

For many U.S. labs, this means achieving publication-quality data while keeping capital costs low.
In 2025, affordable no longer means compromise; it means smarter investment.

The Smart Choice for 2025

EPR spectroscopy continues to play an essential role in chemistry, materials, and life science research across the United States.
As budgets tighten and lab space becomes more limited, Benchtop EPR spectrometers offer an ideal combination of cost, performance, and convenience.

If you are evaluating your next EPR investment, consider how CIQTEK’s X-band Benchtop EPR can help you achieve high-quality results without exceeding your budget.

Coaxial Cable power supply (PoC) technology simultaneously transmits data and power through a single coaxial cable, significantly reducing the number of wiring required for on-board systems such as cameras and high-definition displays, and lowering the overall weight and complexity of the vehicle. This technology plays a crucial role in meeting fuel efficiency standards, supporting an increasing number of camera configurations, and enhancing the display size and resolution of vehicles.

Simplified wiring makes vehicles easier to produce and maintain. The adoption of coaxial cables can also effectively alleviate the common electromagnetic interference (EMI) problems in the communication and control systems of high-speed automobiles, thereby enhancing the reliability and consistency of critical signal transmission.

With the wide application of high-resolution radars, lidars and cameras in advanced driver assistance systems (ADAS) and autonomous driving, the demand for high-speed connectivity in vehicles continues to grow. The new generation of PoC technology can also support standards such as FDD-Link, meeting the high bandwidth requirements of real-time driving interfaces.

As a mature and reliable technology, PoC has been incorporated into various standards, including proprietary solutions of chip manufacturers and open-source implementations of standard organizations. Different solutions offer different signal transmission speeds and power supply capabilities to meet diverse application requirements.

Some standards already existed before the popularization of PoC technology. For example, FDD-Link III and subsequent versions are compatible with PoC; The Gigabit Multimedia Serial Link (GMSL) standard also integrates PoC functionality in its new generation specification. GMSL1 itself does not support PoC, but GMSL2 and GMSL3 have implemented support for it.

SerDes and PoC

SerDes are the core components in PoC implementation, capable of superimposing high-frequency digital signals and DC power supplies on the same coaxial cable for transmission. SerDes convert high-speed parallel signals from devices such as cameras and lidars into serial data streams that can be transmitted over a single line, while PoC further integrates power transmission to achieve data and power supply sharing cables. Many PoC systems also support bidirectional communication through Frequency Division multiplexing (FDM).

The advantages of two-way communication

In a PoC system, the forward channel (downlink) and the backward channel (uplink) transmit data in different frequency bands within the same cable through FDM technology. The forward channel typically operates above 50 MHz to 1 GHz and is used to transmit sensor data to the central ADAS system. The backward channel is mostly used for control signals, with a frequency range typically ranging from 1 to 40 MHz. The filter circuits at both ends of the cable are responsible for separating the DC power supply from the bidirectional data signal.

The key role of the filter circuit

The bias three-way inductor in the PoC filter is the core component for effectively separating the DC power supply from high-frequency signals. It can prevent AC signals from interfering with the power supply and suppress the impact of power supply noise on data quality. This inductor exhibits low impedance to direct current and high impedance to alternating current, thereby maintaining signal integrity while injecting power.

To ensure signal quality, the PoC filtering scheme needs to be capable of carrying the supply current while maintaining a high impedance (typically >1 kΩ, compared to the 50 Ω characteristic impedance of coaxial cables) and preventing inductance saturation. The multi-level LC filtering structure can maintain high impedance throughout the entire frequency band, ensuring the signal-to-noise ratio and stability of communication.

Summary

PoC has multiple standards and implementation methods in the automotive field, which helps to reduce system weight, enhance performance, and support two-way data communication among devices such as cameras and radars. Its key technologies include SerDes interfaces and multi-level filter circuits, which jointly promote the progress of vehicles in terms of fuel economy, connection reliability and system integration.