| 摘要 |
The present invention relates to a power converter with low common mode noise, at least comprising: a ground terminal, a power converting unit, a capacitor unit of common DC bus, a filtering capacitor unit, a filtering inductor unit, and a compensation unit. In the present invention, a filtering inductor unit including three primary windings and three auxiliary windings is used for making the power converting unit couple to three phase terminals of an external electrical apparatus. Moreover, the three auxiliary windings are further formed a compensation circuit by way of being connected with the compensation unit, such that the engineer is able to easily and effectively suppress the common mode noise occurring near the resonant frequency of the power converting apparatus through selecting a suitable turns ratio of the primary windings and the auxiliary windings. |
| 主权项 |
1. A power converter with low common mode noise, comprising:
a ground terminal; a power converting unit, including a first DC terminal, a second DC terminal, a first AC terminal, a second AC terminal, and a third AC terminal; a capacitor unit of common DC bus, coupled to the first DC terminal and the second DC terminal; a filtering capacitor unit, comprising a first filtering capacitor, a second filtering capacitor and a third filtering capacitor, wherein one end of the first filtering capacitor, the second filtering capacitor and the third filtering capacitor are respectively coupled to a first phase terminal, a second phase terminal and a third phase terminal, and the other end of the first filtering capacitor, the second filtering capacitor and the third filtering capacitor are coupled to each other for forming a neutral terminal; and a filtering inductor unit, comprising:
a first primary winding, including a first primary winding low-frequency end and a first primary winding high-frequency end, wherein the first primary winding low-frequency end is coupled to the first phase terminal and the first filtering capacitor, and the first primary winding high-frequency end being coupled to the first AC terminal;a first auxiliary winding, being magnetic coupled to the first primary winding, and including a first auxiliary winding high-frequency end and a first auxiliary winding low-frequency end coupling to the neutral terminal;a second primary winding, including a second primary winding low-frequency end and a second primary winding high-frequency end, wherein the second primary winding low-frequency end is coupled to the second phase terminal and the second filtering capacitor, and the second primary winding high-frequency end being coupled to the second AC terminal;a second auxiliary winding, being magnetic coupled to the second primary winding, and including a second auxiliary winding high-frequency end and a second auxiliary winding low-frequency end coupling to the first auxiliary winding high-frequency end;a third primary winding, including a third primary winding low-frequency end and a third primary winding high-frequency end, wherein the third primary winding low-frequency end is coupled to the third phase terminal and the third filtering capacitor, and the third primary winding high-frequency end being coupled to the third AC terminal; anda third auxiliary winding, being magnetic coupled to the third primary winding, and including a third auxiliary winding low-frequency end coupling to the second auxiliary winding high-frequency end and a third auxiliary winding high-frequency end coupling to the ground terminal. |
