4results about How to "Improve EMC performance" patented technology

The utility model relates to a semi-open type inversion brick structure for an electric drive system, a controller system and a vehicle. The structure comprises a control mainboard, an IGBT module, a heat radiation substrate, a film capacitor, an EMC filtering assembly and a semi-open type housing. One side of the heat dissipation substrate is provided with a heat dissipation water tank, the heat dissipation water tank is connected with a water inlet and a water outlet, the IGBT module is installed in the heat dissipation water tank, the control mainboard is located at the upper end of the IGBT module, the thin film capacitor and the EMC filtering assembly are installed on the side, away from the heat dissipation water tank, of the heat dissipation substrate, and the heat dissipation substrate is installed in the semi-open type shell; a cooling pipeline is arranged in the semi-open type shell, one end of the cooling pipeline is connected with a water inlet pipe, the other end of the cooling pipeline is connected with a water inlet, and the side, away from the heat dissipation water tank, of the heat dissipation substrate is close to the cooling pipeline. Compared with the prior art, the power module has the advantages of being convenient to assemble, good in heat dissipation and cooling effect, high in filtering performance and safety and the like.

The utility model particularly relates to a power supply topology circuit structure used for grid driving power supply. The power supply topology circuit structure comprises a control unit, an LLC circuit connected with the control unit, and a grid voltage division circuit connected with a rectification structure of the LLC circuit. According to the utility model, the LLC circuit and the grid voltage division circuit are combined, so that the power transformer in the LLC circuit has relatively large leakage inductance and relatively small parasitic capacitance from the first side to the second side, thereby effectively reducing EMI noise coupling, achieving the purpose of improving EMC performance of a new energy motor technology, and improving the reliability of the new energy motor. The circuit at least has the advantages of low EMI noise and high EMC performance.

This invention discloses a switching power supply transformer and its manufacturing method. The transformer includes a magnetic core made of PC95 material, a leaded frame, and a primary winding N1, a shielding winding E1, an auxiliary power supply winding N2, a feedback winding N3, and a secondary winding N4 wound on it. Its innovation lies in: the auxiliary power supply winding N2 and the shielding winding E1 are wound synchronously in one layer, with the winding sequence as follows: primary winding N1, auxiliary power supply winding N2 and shielding winding E1 wound synchronously, feedback winding N3, and secondary winding N4; double-layer insulating tape with an overlap width of not less than 3mm is used to strengthen the insulation between the primary and secondary windings; all unnecessary leads are removed to ensure safe spacing; key leads are sleeved with polytetrafluoroethylene (PTFE) tubing; and the magnetic core center post is glued. The transformer of this invention optimizes the manufacturing process, saves material costs, has a reliable structure, high conversion efficiency, high insulation strength, can pass the 3.75kVAC withstand voltage test, and has good common-mode noise suppression, making it particularly suitable for switching power supplies requiring high safety and EMC certification.

The utility model provides a PTC heater improves EMC performance through shielding layer ground connection, including PTC heater body and high pressure connector, low pressure connector, high pressure connector connects PTC heater body through high pressure wire harness, and low pressure connector connects PTC heater body through low pressure wire harness, and the high pressure wire harness includes copper wire layer, insulating layer, shielding layer and insulating rubber layer from inside to outside, and the shielding layer is connected with the whole car ground wire through the ground wire, the utility model discloses a third layer shielding layer of PTC heater high pressure wire harness is connected with the whole car ground wire, and the electromagnetic electricity that shielding layer absorbs is conducted to the whole car ground wire, thereby unloading electricity, thoroughly eliminates PTC to the radiation of whole car and the radiation influence of whole car to PTC, and wiring is simple and convenient, not only solves the electromagnetic interference problem of PTC high pressure wire harness to whole car, but also improves EMC performance, can be used on the PTC heater in new energy automobile air conditioning, and the scope of application is wide.