The objective of the activity is to design, manufacture and test a power module, based on a bi-directional switch power conversion topology and digital control, which integrates three functions, solar array regulation, battery charge and battery discharge regulations, with a power between 2.5 kW and 3 kW for each function.Targeted Improvements:- mass reduction by 35% by integrating the 3 main power control functions (solar array regulation, battery charge and discharge) in one single power conversion stage.- around 5%power overhead reductionDescription:Conventional Power Conditioning Units (PCU) for telecommunication applications split the various power conversion functions in separate modules. Some are dedicated to Solar Array Regulation (SAR), others to Battery Discharge Regulation (BDR) and others to Battery Charge Regulation (BCR). In order to adapt to the various power level configurations at satellite level, each module has an envelope power level to cover a number of configurations. If more power is needed, two modules are used. This means that only the higher power levels have a small mass, volume and power overhead. The proposed concept is to match the power level of one solar panel with the power level of one module. By integrating the SAR, BDR and BCR functions in a single module, the configuration is easily scaled by adding one module per solar panel. With Si MOSFET technology, this was not possible to achievebecause the module power density would be lower than needed. However, with emerging technologies like GaN this may become possible.Moreover, new topologies allow efficient bi-directional conversion and combine all three functions, SAR, BDR and BCR, in a single power conversion stage. Thus, the PCU mass and volume could be reduced by up to 35%. To realise this concept, technologies such as GaN could be also used to build bi-directional switches that are able to route the power between the three nodes: solar array, batter and power bus. GaN switches have very low losses and the overall performance is not penalised. To control this power flow, digital control is needed. Thus, an FPGA or microcontroller would be required in order to understand where the power should be routed and which switches should be turned on and off. In this activity, an engineering module integrating the SAR, BDR and BCR functions with a power level capability between 2.5 kW and 3 kW in all three functions will be designed, built and tested. The module will be thermally representative to enable representative performance testing.