Abstract: An example embodiment includes three fans (F4, F5, F6) associated with three compression chambers (respectively CH2; CH3; CH4) that are separated from one another by walls (W5, W6) capable of maintaining a difference in pressure. One of the fans (F4) causes, in the chamber (CH3) associated with said fan, a pressure greater than that caused by the other fans (F4, F6) in the other chambers (CH2, CH4), in order to create air currents (C17, . . . , C20) with a higher flow, and which are intended to cool circuit boards (B16, B17, B18) having a lower dissipation than the other boards (C12, . . . , C15, C19, . . . , C22).

Abstract: A protection circuit (PD1) enables a load (L) to withstand a transient power supply failure. It comprises: inputs connected to at least one electrical power supply (B1, B2), outputs connected to the load (L), at least two storage capacitors (SC1, SC2), and first switching means (D1 to D4, SW3, CU) such that the two storage capacitors are: connected in parallel to at least one power supply (B1, B2) when the voltage of at least one power supply is greater than a fixed value; and isolated from any power supply (B1, B2) and connected in series to the outputs of the circuit (PD1) when the voltage of each power supply is less than or equal to the fixed value. Application to electronic equipment, in particular telecommunications equipment.