In aeronautics and more specifically in an all-electric aircraft, the main objective is to reduce the mass and volume of the components. For this, the electric actuators gradually replace hydraulic and mechanical actuators. These electric actuators need to be commanded; THOR project (European project supporting this thesis) aims to develop a control stage to command the power switches. The switches are located in the direct vicinity of the driver stage with an output voltage that can reach up to 3 kV hence the need for a galvanic isolation. Formerly, the opto-couplers were used to provide galvanic isolation in the control stages. However, in order to use these components in thermal constraining environment and ensure better integration, opto-couplers are no longer appropriate and are replaced by transformers. In this context, the main objective of this thesis is to develop, realize and characterize integrated planar transformers that meet the THOR specifications. At first a state of art on the different manufacturing technologies of planar transformers is established before choosing the technology and the materials used in the fabrication of our planar transformers. In a second step, we are interested in the choice and size of the transformer structure. Two structures that met the THOR specifications were selected and resized using a simulation software (HFSS). Finally, these two structures were realized and characterized using an RLC-meter at low frequency and a Vector Network Analyzer (VNA) at high frequency. For both structures, the characterization allowed to verified the magnetizing inductance greater than 1 μH desired by the THOR project and a coupling factor greater than 0,9 obtained par simulations. Other important parameters were also extracted namely the inter-winding capacity where less than few pF wasobtained and the windings resistance has been identified less than 10 Ω
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