Patent ID: 6490181
Filing Date: 2002-12-03
Classification: B29C,G06F,H02M

Abstract:
A common mode noise reducing apparatus for reduction of common mode noise in a switching power converter having at least one input terminal and at least one output terminal, the common mode noise reducing apparatus comprising:means for sensing a signal potential difference corresponding to a potential difference between an output node connected to the at least one output terminal of the switching power converter and an input node connected to the at least one input terminal of the switching power converter; a voltage generating source producing in response to the signal potential difference a counter-acting voltage wherein voltage generating source is connected to a node such that the counter-acting voltage reduces the potential difference between the output node connected to the at least one output terminal of the switching power converter and the input node connected to the at least one input terminal of the switching power converter; and a series impedance coupled to the voltage generating source in a path linking the at least one input terminal and the at least one output terminal via at least one capacitor.