Electrical system, characterized in that it comprises: - an electrical load (42, 43) that is liable to consume a maximum current Im; - a decoupling capacitor connected in parallel to the terminals of the electrical load; - a DC voltage electrical power supply system, comprising first and second terminals (321, 322) for applying a supply voltage to the terminals of the electrical load, including: - a DC voltage source comprising first and second poles, the second pole being connected to the second terminal of the electrical power supply system; - a first branch including a first contactor selectively connecting the first pole of the DC voltage source to the first terminal of the electrical power supply system; - a second branch including first and second switches (302, 303) and an inductor that are connected in series in order to selectively connect the first pole of the DC voltage source to the first terminal of the electrical power supply system; - a device (307, 308, 309) for unidirectional conduction from the second terminal of the DC power supply system to a connection node between the second switch and said inductor; - a control circuit comprising: - a mode for supplying power to the electrical load (42, 43) wherein the first contactor is kept closed; - a mode for charging the decoupling capacitor wherein the control circuit keeps the first contactor open, wherein the control circuit keeps the first switch closed and wherein the control circuit controls the switching actions of the second switch so as to output a current regulated to a level higher than Im via the inductor, wherein it toggles to the mode for supplying power to the electrical load when it determines that the voltage between the first and second terminals exceeds a first threshold, the current through a circuit including the electrical load and the decoupling capacitor flowing in the same direction in the mode for power supplying power to the electrical load and in the mode for charging the decoupling capacitor. - an electrical load (42, 43) that is liable to consume a maximum current Im; - a decoupling capacitor connected in parallel to the terminals of the electrical load; - a DC voltage electrical power supply system, comprising first and second terminals (321, 322) for applying a supply voltage to the terminals of the electrical load, including: - a DC voltage source comprising first and second poles, the second pole being connected to the second terminal of the electrical power supply system; - a first branch including a first contactor selectively connecting the first pole of the DC voltage source to the first terminal of the electrical power supply system; - a second branch including first and second switches (302, 303) and an inductor that are connected in series in order to selectively connect the first pole of the DC voltage source to the first terminal of the electrical power supply system; - a device (307, 308, 309) for unidirectional conduction from the second terminal of the DC power supply system to a connection node between the second switch and said inductor; - a control circuit comprising: - a mode for supplying power to the electrical load (42, 43) wherein the first contactor is kept closed; - a mode for charging the decoupling capacitor wherein the control circuit keeps the first contactor open, wherein the control circuit keeps the first switch closed and wherein the control circuit controls the switching actions of the second switch so as to output a current regulated to a level higher than Im via the inductor, wherein it toggles to the mode for supplying power to the electrical load when it determines that the voltage between the first and second terminals exceeds a first threshold, the current through a circuit including the electrical load and the decoupling capacitor flowing in the same direction in the mode for power supplying power to the electrical load and in the mode for charging the decoupling capacitor. - a mode for supplying power to the electrical load (42, 43) wherein the first contactor is kept closed; - a mode for charging the decoupling capacitor wherein the control circuit keeps the first contactor open, wherein the control circuit keeps the first switch closed and wherein the control circuit controls the switching actions of the second switch so as to output a current regulated to a level higher than Im via the inductor, wherein it toggles to the mode for supplying power to the electrical load when it determines that the voltage between the first and second terminals exceeds a first threshold, the current through a circuit including the electrical load and the decoupling capacitor flowing in the same direction in the mode for power supplying power to the electrical load and in the mode for charging the decoupling capacitor.