Patent ID: 8933685
Filing Date: 2015-01-13
Classification: H02M

Abstract:
1. A protection system for a direct current to direct current voltage converter (DC-DC converter) comprising: a frequency detector circuit configured to monitor a pulse frequency of a pulse signal generated by the DC-DC converter at a node formed between a switching output of the DC-DC converter and an inductor coupled between the switching output and a load output, wherein the pulse frequency of the pulse signal varies with an external magnetic field coupling with the inductor; a linear regulator having an output coupled to the load output of the DC-DC converter; and a control system configured to disable the load output of the DC-DC converter and enable the output of the linear regulator when the frequency detector circuit detects that the pulse frequency has moved outside a predetermined threshold range as a result of the external magnetic field coupling with the inductor exceeding a given magnetic field strength.