CIRCUIT AND METHOD OF CONTROLLING VEHICLE BATTERY CHARGES

It encompasses a battery (B1) that feeds network charges (1) connected to one of its terminals (2), a generator (G) in the mentioned network (1), a battery (B2) for a secondary network (3) and start-up functions, and a BC02 controlled switch which depending on the status of the charge of (B1) and (B2) and the demands of charges C1, C2 from networks (1) and (3), enables current flow between networks (1) and (3) in any direction, including a power barrier diode (4) That bridges the mentioned BC02 switch providing a current flow smaller than the one flowing through the BC02, when it is closed, and also smaller than the current going from the generator (G) to battery (B1). This method provides energy transference between batteries (B1) and (B2)s.