Patent ID: 9632118
Date: 2017-04-25
CPC Classifications: G01R

Claim:
1. A current sensing apparatus comprising: a temperature sensor configured to sense a temperature of a power converter, thereby generating a sensed temperature; a current sensing unit configured to sense an input current of the power converter, thereby generating a sensed input current; and a central processing unit (CPU) configured to control an operation of the power converter in response to the sensed temperature of the power converter and the sensed input current of the power converter, wherein the CPU includes: a compensation unit configured to store, upon receiving an indication of the sensed temperature of the power converter from the temperature sensor, an operation voltage of at least one diode included in the current sensing unit in a map, and to compensate for an error of the sensed input current based on the stored operation voltage when the current sensing unit senses the input current of the power converter, and wherein the current sensing unit includes: a current transformer configured to sense the input current of the power converter; a rectifier configured to rectify an output signal of the current transformer; a comparator configured to compare an output signal of the rectifier to a feedback signal of a first node, and to output a result of the comparison to the first node; and a filter unit configured to filter a signal of the first node.