By Alex McCarthy 26th September 2019
Murata has announced an HPHF (high power, high frequency) transformer technology that uses a proprietary winding technique, allowing designers to “efficiently reach power and frequency levels that were never possible with conventional winding methods”, the firm says.
Murata’s patented pdqb winding technology makes it possible to construct high frequency transformers of up to and over 400kW that can operate at frequencies up to 50kHz. The pdqb winding technique overcomes the skin and proximity effects as well as other high frequency losses associated with conventional construction methods, delivering a >99.5 % efficient solution.
The winding technique provides increased working voltage and elevated isolation voltage (up to 10kV). The leakage inductance is controllable and interwinding capacitance is low. Thermal performance is also improved.
Murata is able to design custom HPHF transformers operating around 4-50kHz with power ratings from 30kW to 400kW. The transformers can be designed with turns ratios from 1:1 to 10:1 having multiple secondary windings if desired, and are capable of handling input and output voltages in the range 50V to 1kV. A 100kW transformer fits within a 18x21x25cm package size.
Commenting on the release, Andrea Polti, global product manager, Murata said “The HPHF solution really showcases a technology capability that allows us at Murata to provide customized solutions to meet or exceed specific customer requirements.”
Murata’s suggested applications for its HPHF transformers include eV/HeV fast charging, railway (both rolling stock and trackside), renewable energy, smart grid energy distribution and medical applications including x-ray and MRI systems.
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