As LED lighting technology continues to evolve, LED drivers are expected to deliver higher performance — improved efficiency, lower electromagnetic interference (EMI), smaller footprints, and longer service life. To meet these demands, high-frequency transformers and inductors play a key role in power supply design.
1. Basic Structure of an LED Driver
A typical LED power supply includes the following modules:
| Module | Function Description |
| Rectification & Filtering | Converts AC to DC and suppresses power grid noise |
| PFC (Power Factor Correction) | Improves energy utilization and complies with EMC standards |
| DC-DC Conversion | Ensures stable DC voltage output |
| EMI Filtering | Reduces electromagnetic interference to nearby devices |
| Control Circuitry | Regulates output and provides protection features |
Among these, high-frequency transformers and inductive components are essential in both PFC and DC-DC stages.
2. Advantages of High-Frequency Transformers in LED Power
Operating at tens or even hundreds of kHz, high-frequency transformers significantly reduce size and increase energy transfer efficiency. Their key advantages include:
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Compact design: High frequency allows for smaller magnetic cores
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Higher efficiency: Reduced core and copper losses
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Better insulation performance: Meets diverse safety and isolation standards
High-frequency transformers are commonly used in flyback, forward, and LLC resonant topologies for LED drivers.
3. The Role of Inductors in LED Power Design
Common types of inductors used in LED power supplies include:
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Power inductors: For energy storage, filtering, and output stability
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Common mode chokes: For EMI suppression and regulatory compliance
Common mode chokes, in particular, are critical in the input EMI filter stage. They effectively reduce conducted and radiated interference, helping power supplies pass CE, FCC, and other certifications.
4. Real-World Component Specifications (Sample)
Below is a sample bill of materials for a 30W LED driver:
| Component Type | Model / Spec | Circuit Position | Notes |
| High-Frequency Transformer | EE16 Custom Model | DC-DC Transformer | 65kHz, 3kV isolation |
| Power Inductor | 22µH 3A SMD Type | Output Filter | Compact design, low ripple |
| Common Mode Choke | 10mH 250V AC | EMI Filter | Dual-core, low leakage inductance |
5. Choosing the Right Supplier
When sourcing transformers and inductors for LED power, consider the following:
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Customization capabilities (tailored to your output voltage/current needs)
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Rigorous testing and reliability screening
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Support for safety certifications (UL, CE, CB, etc.)
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Experience in magnetics co-design for LED applications
As a specialized manufacturer of high-frequency transformers, inductors, and common mode chokes, we offer over 20 years of experience in the industry, serving clients in LED lighting, industrial power, and home appliances. We are committed to delivering reliable, high-performance magnetic solutions to OEM and ODM partners worldwide.
Post time: May-04-2025