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The high frequency high voltage (HFHV) transformer is one of the biggest contributors for conducted electromagnetic interference (EMI) emission of switching power supply. The transformer technologies for reducing conducted EMI emission focus on the shielding and changing the winding structures. However, for suppressing conducted EMI, the suppression capability of shielding is limited; current methods...
Magnetic components are generally used in electrical devices. However the interference to the environment of these components is not widely explored. This study presents a comparative analysis of the magnetic field distribution of three different winding techniques with a toroidal core. The analytical model is based on finite element analysis. The effects of the winding layout around a single core...
In order to construct a low-impedance loop for common-mode electromagnetic interference (EMI) signals, traditional method is to use Y-capacitors as filtering components. However, in the commonly used isolated ac–dc switching-mode power supplies (SMPS), the Y-capacitors branch also behaves as a terrible leakage current loop. For the safety of human beings, this leakage current is not allowed in commercial...
Primary-side regulation (PSR) scheme is widely used in low-cost and low power applications such as cell phone charger and LED lighting. Generally, an auxiliary winding in the conventional flyback converter is used for both power supplier and feedback sensing. With the increase of labor cost, the transformer needs to be produced automatically. So the transformer architecture should be designed as simple...
At present, Y capacitor is widely adopted inside an isolated switched mode power supply to pass EMI tests. However, to meet certain safety standard, engineers are trying to reduce the Y-cap in such equipment as cell phone and pad chargers, medical instruments, handheld and portable equipment. As we know, the removal of Y-cap offers a big challenge for the EMI design. To solve the problem, this paper...
Due to the interaction between human and the power supply equipment, more and more Switch-mode power supplies (SMPS) require lower leakage current. In the AC-DC SMPS, the leakage current is mainly caused by the Y-capacitors. It is better to remove the Y-caps in this situation. But connecting Y-caps between the primary return line terminal and the secondary return line terminal is a very common method...
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