Modeling method for electromagnetic interference emission circuit model of wireless charging system of new energy automobile
A new energy vehicle, wireless charging technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as not considering the impact
Inactive Publication Date: 2019-09-03
BEIJING INSTITUTE OF TECHNOLOGYGY
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4) Using the two-port equivalent circuit method and the linear matrix equivalent method to model the charger inverter, analyze and predict the electromagnetic interference, without considering the influence of the parasitic parameters of the internal circuit of the charger inverter on the electromagnetic interference
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Embodiment 1
[0020] figure 1 It is a schematic structural diagram of an electromagnetic interference transmitting circuit model of a wireless charging system according to an embodiment of the present invention; figure 2 It is a common-mode interference path diagram according to an embodiment of the present invention; image 3 It is an equivalent path of common-mode interference in an embodiment of the present invention.
[0021] see figure 2 , the common-mode interference propagation path is analyzed in conjunction with the primary and secondary sides of a wireless charging system. The common-mode interference path consists of 4 paths. The common-mode current of the first path flows back to the ground through LISN, and is divided into two paths, one of which flows through the MOS transistor S 3 The interelectrode capacitance C 5 , lead inductance L P2 , LISN resistance R 2 and LISN capacitor C 9 After that, it flows back to the ground and flows through the lead inductance L P1 , ...
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The invention discloses an electromagnetic interference transmitting circuit model of a wireless charging system of a new energy automobile. A device comprises an artificial power supply network, a filter capacitor, an inverter, a primary side compensation topology, a primary coil, a secondary coil, a secondary side compensation topology, a rectifier, a filter, a battery and a parasitic model. Theartificial power supply network is formed by connecting the resistor and the capacitor in series, the filter capacitor model is composed of the capacitor, and the inverter model mainly consists of metal-oxide semiconductor field effect transistor; the compensation topology model consists of the inductor and the capacitor which are connected in series and in parallel, the coil model is composed ofthe inductor, and the parasitic model comprises a filter capacitor parasitic parameter, a parasitic parameter of a lead and a connecting cable, a parasitic parameter of the coil and a parasitic parameter of a compensation topology, and the coil is composed of a ground distributed capacitor of the coil, a ground distributed capacitor of the battery and a ground distributed capacitor of the midpoints of two bridge arms of the inverter. According to the present invention, the analysis of the common-mode interference path and the differential-mode interference path can be realized, a conduction voltage transfer function is established, and the influence factors influencing the generation of the common-mode electromagnetic interference and differential-mode electromagnetic interference are obtained.
Description
technical field [0001] The invention relates to the technical field of electromagnetic compatibility of new energy vehicles, in particular to a modeling method for an electromagnetic interference transmitting circuit model of a wireless charging system of a new energy vehicle. Background technique [0002] Compared with traditional conductive charging, wireless charging technology can solve the problems of convenience and safety of charging new energy vehicles, and is an emerging technology with potential. Wireless charging technology uses the primary coil to transmit high-frequency alternating current to space in the form of high-frequency alternating magnetic field, and generates induced electromotive force at the receiving end by means of magnetic field coupling, which is then used for power supply of subsequent circuit loads, thereby completing the wireless transmission of electric energy . Due to its unique working mode, electromagnetic interference problems will inevi...
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IPC IPC(8): G06F17/50
CPCG06F30/367
Inventor 翟丽钟广缘
Owner BEIJING INSTITUTE OF TECHNOLOGYGY