High Frequency Transformers
High-frequency transformers are magnetic components wound on ferrite (or other soft-magnetic) cores to operate in the tens-of-kHz to MHz range used by switch-mode power supplies (SMPS), inverters, DC-DC converters, induction heating and similar power-electronics.
Overview
High-frequency transformers are magnetic components wound on ferrite (or other soft-magnetic) cores to operate in the tens-of-kHz to MHz range used by switch-mode power supplies (SMPS), inverters, DC-DC converters, induction heating and similar power-electronics. Operating far above line frequency lets a much smaller core transfer the same power, so these units are compact and lightweight while providing the three core functions of a transformer: energy transfer, voltage step-up/step-down, and galvanic isolation between primary and secondary. They are designed around low core loss, controlled leakage inductance and high-frequency winding techniques (litz wire, interleaving) to keep efficiency high and limit heating. ACE builds these to the customer's electrical specification, making them suited to OEM power-electronics and custom converter designs rather than off-the-shelf use. A buyer chooses a custom high-frequency transformer when a standard part cannot meet the required turns ratio, isolation, footprint or thermal and waveform conditions of their converter.
Specifications
| Power rating | typically a few VA up to several kVA (design-dependent) |
|---|---|
| Operating frequency | ~20 kHz to several hundred kHz (up to MHz for special designs) |
| Core material | ferrite (Mn-Zn / Ni-Zn), with options such as nanocrystalline/amorphous |
| Topology served | forward, flyback, push-pull, half/full-bridge, LLC resonant |
| Primary/secondary voltage and turns ratio | per application |
| Number of windings/outputs | single or multiple isolated secondaries |
| Isolation / dielectric withstand (Hi-pot) rating | |
| Insulation/thermal class (e.g. Class B/F/H) and construction (bobbin, planar, toroidal) | |
| Leakage inductance and inter-winding capacitance limits | |
| Mounting | PCB-mount or chassis/encapsulated |
| Phases | single-phase (most), multi-phase for special converters |
Applications
- Switch-mode power supplies (SMPS)
- DC-DC converters and resonant converters
- Inverters and UPS power stages
- Battery chargers and PWM rectifiers
- Induction heating and high-frequency power electronics
- OEM / custom power-electronics modules
Frequently asked questions
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