Modifying conducted interference in low-frequency stage based on improving the way of wilding of planar voltage transformer

Onboard DC/DC power supply has the features of small cubic measure, without ground point PE to link Y capacitor, as a result, it can’t take common mode choke to reduce electrical magmatic compatibility which is very difficult to resolve in low-frequency stage. This article shows a kind of good methods to resolve this problem. The method improves the way of wilding of planar voltage transformer to reduce parasitic capacitance of both sides, which can modify 12dB in low-frequency stage.