Common mode noise reduction circuit utilizing dual primary...

H - Electricity – 02 – M

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H02M 1/12 (2006.01) H01F 38/00 (2006.01) H02J 3/00 (2006.01)

Patent

CA 2593947

A common mode noise cancellation circuit eliminates common mode noise generated by a high-frequency switching device. The common mode noise reduction circuit includes a single switching device and a transformer. The switching device receives a rectified voltage and produces a switched voltage. The transformer includes a first primary winding, a second primary winding, and a secondary winding. The transformer couples the switched output from the first and the second primary winding to the secondary winding to generate a transformed voltage. A positive signed common mode noise waveform generated by the switching device is coupled from the first primary winding to the first secondary winding, and a negative signed common mode noise waveform generated by the switching device is coupled from the second primary winding to the first secondary winding, which results in a lower magnitude common mode noise waveform being present at the secondary winding.

Un circuit de suppression du bruit en mode commun élimine le bruit en mode commun produit par un dispositif de commutation à haute fréquence. Ce circuit comprend un seul dispositif de commutation et un transformateur. Le dispositif de commutation reçoit une tension redressée et il produit une tension à découpage. Le transformateur comprend un premier enroulement primaire, un second enroulement primaire et un enroulement secondaire. Le transformateur couple la sortie commutée du premier et du second enroulements primaires à l'enroulement secondaire pour produire une tension transformée. Une forme d'onde de bruit en mode commun de signe positif produite par le dispositif de commutation est couplée, du premier enroulement primaire au premier enroulement secondaire. Une forme d'onde de bruit en mode commun de signe négatif produite par le dispositif de commutation, est couplée du second enroulement primaire, au premier enroulement secondaire. Il en résulte une forme d'onde de bruit en mode commun de moindre amplitude à l'enroulement secondaire.

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