Patent ID: 9419529
Filing Date: 2016-08-16
CPC Classification: G01R,H02M

Claim Text:
1. A voltage measuring apparatus, comprising: an input configured to be coupled to a secondary of an inductive coupling of a DC to DC voltage converter; an output; a sampling capacitor coupled to the output; a switch coupled to the input and forming a discharge path parallel to the sampling capacitor dependent on an input voltage at the input equaling or exceeding a first voltage and independent of an output voltage at the output; and, a rectifier in a series relationship with the sampling capacitor, biased to conduct upon the input voltage, minus the output voltage, equaling or exceeding a second voltage, wherein when the switch is turned on the sampling capacitor is charged to a voltage of the secondary of the inductive coupling and when the switch is turned off the sampling capacitor holds a last charged voltage of the secondary of the inductive coupling.