Jul 26 2009
Fruitful partnership between Noliac Motion and the LAPLACE Laboratory in France has resulted in a very small piezoelectric multilayer Rosen transformer of 12.6 mm x 1.5 mm x 0.5 mm granting a conversion ratio of 40 and Lambda mode at 235kHz.
Excellent correlation
The Research Group in Electrodynamics, LAPLACE Laboratory in France has designed the transformer from a global algorithm optimization, and Noliac Motion has manufactured the component. Testing shows an excellent correlation between theory and practical results.
Mr. Francois Pigache of the research group in France states:
- Our cooperation with Noliac Motion has been very fruitful. The Noliac team is extremely competent and the work done is completely satisfactory. Thus, I look forward to working with Noliac again in future.
Details of design
The design is based on a classical multilayer Rosen layout.
- The lengths of primary and secondary sides are equal
- The primary side is laminated with layer thickness of 70 µm
- Polarization of primary side is along thickness
- Polarization of secondary side is along length
- Parameters of electrical equivalent circuit have been simulated by analytical and numerical methods.
Electrical equivalent circuit of transformer
The elements of equivalent circuit are deduced with a relative good precision. This allows an accurate design for optimal operating conditions.
Efficiency reaches 90% at resonance.
Manufacturing caused no issues
Noliac Motion manufactured the transformer using state of the art processes.
Even with the small dimensions of the component, all processes were accomplished without any issues. Thus, Noliac Motion is confident that even more challenging productions are possible.
Applications
The miniature transformer is advantageous for step-up as well as step-down applications.
- Step-up - Portable electronics and remote sensing (to power small electro-magnetic or piezoelectric devices from battery, fuel cell or energy harvesting source such as solar cells)
- Step-down - Powering low voltage electronics from a medium voltage source