Transformer’s winding technique obtains new power levels
Introducing a new transformer technology, Murata claims that it is now possible to construct high frequency transformers of 400kW and above that can operate at frequencies as high as 50kHz.
The transformer technology is for high power, high frequency applications. It uses a different winding technique to allow designers to efficiently reach power and frequency levels that were never possible with conventional winding methods, claims Murata.
The patented pdqb winding technique overcomes the skin and proximity effects as well as other high frequency losses associated with conventional construction methods, explains Murata. It is capable of delivering a minimum efficiency of 99.5 per cent, in a compact footprint.
According to Murata, there are a number of further benefits to the winding technique including an increased working voltage and elevated isolation voltage (up to 10kV). The leakage inductance is controllable and inter-winding capacitance is low, both of which enhance performance in customer’s designs, notes the company.
Thermal performance is also improved, eliminating the space requirements and cost associated with heatsinking. Each design can be optimised with simulation software.
Murata is able to design custom high power, high frequency transformers operating around 4.0 to 50kHz with power ratings from 30 to 400kW. The transformers can be designed with turns ratios from 1:1 to 10:1 and can have multiple secondary windings if desired. They are capable of handling input and output voltages in the range 50V to 1kV. A 100kW transformer fits within a compact 180 x 210 x 250mm package size.
Transformers using the pdqb winding technology are suitable for challenging applications such as electric vehicle/hybrid electric vehicle (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.
Murata manufactures electronic components, modules, and devices. The company’s product range includes ceramic capacitors, resistors/thermistors, inductors/chokes, timing devices, buzzers, sensors and EMI suppression filters. In addition to ceramic capacitor manufacture, it also supplies Bluetooth and Wi-Fi modules, board-mount DC/DC converters and standard and custom AC/DC power supplies.
