Method for establishing a functional diagnosis for a buck static DC-DC voltage converter

摘要

A method for establishing a functional diagnosis for a buck static DC-DC voltage converter in an electric or hybrid vehicle including a power supply circuit including at least a first and a second electrical voltage source supplying respectively a primary and a secondary circuit with direct current, the first source having a voltage value greater than the second source, the primary and secondary circuits being connected by the voltage converter which itself is commanded by control and safety elements, includes the following sequential steps:deactivating any power consumer on the primary circuit or waiting for any power consumer on the primary circuit to be inactive,commanding from the converter an output voltage greater than the voltage of the second electrical voltage source,determining if there is a power transfer from the primary to the secondary circuit, and:if not, establishing a faulty functionality diagnosis for the converter.