Electrical power supply converter

A converter comprising at least one converter module presenting at least one electricity feed terminal for coupling to an electricity generator such as a solar generator and to an electricity feed line such as a bus, and including at least one series switch and at least one parallel switch, the series switch being connected in series between the electricity feed terminal and a first inductor, itself connected in series with an electricity source including at least one battery, the first series switch and the first inductor forming a series branch, and the parallel switch being connected in parallel between said series branch and ground, said switches of said module being controlled in phase opposition by a control circuit presenting a first control state in which said switches are operated in a first or “voltage-lowering” mode of operation in which electrical current flows from the electricity generator to the electricity feed line, and a second control state in which said switches are operated in a second or “voltage-raising” mode of operation in which said current flows from the electricity source towards the electricity generator, wherein the parallel switch is connected in a parallel branch between said electricity feed terminal and ground, and wherein the control circuit presents a third or “shunt” control state in which the parallel second switch is closed and the series switch is open.