Power stage and control modelling, proof of concept development, innovative solutions to power conversion problems. High efficiency, soft switching, EMC compliant intellectual property to licence to OEMs. Rectifiers, Inverters, converters and control.

7.5 to 135VDC input, constant current range to 50.2 amps, fan cooling powered from DC input (no mains power required) this simple electronic load provides a useful portable load box for many applications.

24VDC, 48VDC, 110VDC, 220VDC 10A to 50A 19" rack mount, shelf mount & wall mount, full alarms and set-ability, LCD display of volts and amps, auto boost, earth leakage - click on products for full detail...

Developed for an in house application, these converters can be made for applications from a few watts up to hundreds of watts. Also providing an additional 12V (for example) aux supply for user control electronics.

Front end unity power factor rectifiers and complete isolated output rectifiers now available from Preston with lowest parts count and simple control - for robust and reliable operation.

Altium / Protel is the de-facto standard for pcb layout. We offer a service to convert gerber files output by other software packages into protel 2.8 so that valuable pcb work can be continued in protel.

Using our single stage technology OEMs' can now have high power factor and high efficiency and high reliability in an adapter format.

Military specified high power converter blocks:

For powering the next generation of light weight pc's and TFT monitors - our new compact adapter technology breaks new ground in, size, weight and efficiency!

Using either the two FET - two diode booster for UPF front ends, OR, by modifying your existing converter to remove the bridge rectifier and save watts on a power supply design! (a 500W psu at 90Vac will save 10watts with an input bridge-less design)

24dBuV per metre measured @ 1m. We cure power supply emissions for a military blood fridge. Conducted emissions down to 10kHz as well

More and more design groups are asking themselves - why wait for the prototype to fail EMC before calling on experienced input from the people who have done it for years...

Preston designs and manufactures to order specialised high power DC-DC Converters, high efficiency & low RFI, custom shapes (e.g. cylindrical) high speed control loops for quickly fluctuating loads, proven reliability.

Non optimal firing of power transistors, instability & susceptibility of a control ckt can result in your power ckt making more RFI than it really has to...