Gallery View: Miniaturization remains key pursuit in high-frequency transformers

Although China makers turn out high-frequency transformers based on flat cores, they are eyeing next releases in chip and film forms, and considering the use of nanocrystalline materials.

Making transformers even smaller is still the R&D priority for high-frequency applications in China. This is while suppliers continue to boost product performance.

Flat-core variants are still popular in the local market, so manufacturers keep working on new models. Dongguan Benc has released a patented ultrasmall unit with 1kHz to 1MHz frequency range and 10W to 10kW rated power. In the years to come, chip and film types will gain attention in the domestic manufacturing sector.

Further down the line, there is the possible switch from conventional to nanocrystalline materials. Presented as the optimal alternative, the latter combines the advantages of silicon steel, permalloy and ferrite. It has high saturation induction, permeability, efficiency and temperature stability, and will ensure low core loss. The input is predicted to be adopted initially in midrange and upscale high-frequency transformers.

The mainstream lineup in China is categorized by frequency range, with 20 to 50kHz, 50 to 200kHz, 200kHz to 1MHz and exceeding 1MHz as options. The first leads output and is mainly for switching power supplies.

Products use cores in EI, EE, EC, U and UF types, and have 1,000 or 10,000kVA rated power, 400V/200V voltage ratio, 95 percent efficiency, and EMI and EMC protection. Most companies ensure releases meet CE, RoHS and UL requirements.

The key components and materials include ferrite cores, coils, bobbins, copper foil tapes, wires and glue, and come from local or foreign providers. Input cost is expected to remain stable and keep prices unchanged in the months ahead.

The products in this gallery have been handpicked by our China-based market analyst for representing current trends in high-frequency transformers from China makers.

Single phase, 20 to 5,000kHz

This single-phasetransformer from Chipsen Electronics Technology Co. Ltd, EE-55-High Frequency model, operates on 20 to 5,000kHz. The UL-listed unit with more than 98 percent efficiency has 50W maximum operating and ≥300W transmission power.

An order of at least 3,000 units has a delivery lead time of 7 days.

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>98% efficiency

Chipsen Electronics Technology Co. Ltd markets this transformer, EE-25-High Frequency model, with 20 to 5,000kHz operating frequency, more 98 percent efficiency, and 50W maximum and ≥35W transmission power. The single-phase unit meets UL requirements.

The 3,000-unit minimum order has a 7-day delivery lead time.

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0 to 5kW power

For household appliances, LED lighting, instruments, meters, and communications and new energy applications, the model XP-008 high-frequency transformer from Dezhou Xinping Electronics Co. Ltd has up to 5kW power.

An order of at least 100 units is required. Delivery is within 5 days.

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Up to 5kW rating

Model XPKG10500 high-frequency transformer from Dezhou Xinping Electronics Co. Ltd has up to 5kW power range. Applications include household appliances, LED lights, instruments, meters, and the communications and new energy fields.

The supplier requires aminimum order of 100 units for delivery within 5 days.

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Up to 120mohm maximum DCR

From Dongguan TNK Electronic Technology Co. Ltd, this RoHS-compliant high-frequency transformer, TNKLDQ058 model, uses a 6-pin through-hole module. It supports 80 or 120mohm maximum DCR and operates in -40 to 85 C.

An order of at least 500 units is delivered within 30 days.

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Meets EN 60950, RoHS

Adopting 5+5 pins, the model TNKTSE020 SMD PoE transformer from Dongguan TNK Electronic Technology Co. Ltd has -250Vrms insulation rating and -40 to 85 C operating temperature. It complies with EN 60950 and RoHS requirements.

The minimum order is 500 units. Delivery lead time is 30 days.

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