Patent ID: 9606151
Date: 2017-03-28
CPC Classifications: G01R,H02M,H03F

Claim:
1. A circuit for sensing current flowing through a capacitor, comprising: a sense capacitor having a first terminal and a second terminal, wherein the first terminal is coupled at a node to a first terminal of a resonant capacitor and to a first terminal of a primary winding of a transformer of a resonant isolated power converter, wherein a second terminal of the primary winding is coupled to a switching node wherein a sense current flowing through the sense capacitor is proportional to a resonant current flowing through the resonant capacitor, and wherein a second terminal of the resonant capacitor is coupled to a common reference; and a transimpedance amplifier having: a first input coupled to the second terminal of the sense capacitor; a second input coupled to a voltage reference; and a voltage output that is proportional to the sense current flowing through the sense capacitor.