Patent ID: 8405948
Filing Date: 2013-03-26
Classification: H02M

Abstract:
1. An electromagnetic interference (EMI) noise shielding device, applied to a digital power supply control system, and comprising: a first resistor having a first terminal and a second terminal; a second resistor, having a first terminal electrically coupled to a second terminal of the first resistor to form an input terminal, for receiving a feedback voltage signal containing a noise; a differential amplifier, having a first input in electrically coupled to the first terminal of the second resistor and the second terminal of the first resistor, and a second input pin electrically coupled to the second terminal of the second resistor and then electrically coupled to a ground, for receiving the feedback voltage signal containing the noise to perform a first filter process, so as to generate a first node voltage signal; a signal converter, having a first input pin electrically coupled to the differential amplifier for receiving the first node voltage signal to perform an analog-to-digital signal conversion process and a second filter process, so as to generate a second node voltage signal; and a digital control circuit, having an input pin electrically coupled to the signal converter and an output in electrically coupled to the first terminal of the first resistor, for receiving the second node voltage signal to perform a determination process and a third filter process, so as to generate a third node voltage signal for output.