Electric vehicle and on-board charger control method and device for electric vehicle

Abstract

The invention discloses a control method and device for an electric vehicle and an on-board charger of the electric vehicle, wherein the method includes: obtaining the charging power allowed this time; determining the number of conduction phases of the PFC circuit according to the charging power; The actual charging time TA through the second phase, the actual charging time TB through the second phase, the actual charging time TC through the third phase and the actual charging time TD through the fourth phase; according to the actual charging time TA through the first phase, through the second phase The phase actual charging time TB, the actual charging time TC through the third phase and the actual charging time TD through the fourth phase determine the phases to be switched on. This method can realize rectification by controlling the on-off of different phases under different power levels, reduce the harmonic content of AC current, improve the efficiency of the front-stage PFC at low power, and not only improve the working life of the switch tube in the PFC, And prolong the life cycle of the car charger.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to an electric vehicle and an on-board charger control method and device for the electric vehicle. Background technique [0002] With the development of commercialization of electric vehicles, the on-board charger on electric vehicles has become one of the important components on electric vehicles. At present, the power factor (Power Factor, PF for short) and THD (Total Harmonic Distortion, Total Harmonic Distortion) of the car charger have also become important performance indicators to measure the performance of the car charger. [0003] In related technologies, power factor correction is performed by using multi-phase interleaved PFC (Power Factor Correction, power factor correction) on the AC side. [0004] However, under any working conditions, all the switching devices in the front-stage PFC are in the high-frequency operating state, so that when the power factor correction ...

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Problems solved by technology

[0004] However, under any working conditions, all the switching devices in the front-stage PFC are in the high-frequency operating state, so that when the power factor correction is performed by using multi-phase interleaved PFC on the AC side, if the AC side current is small, the AC current The harmonic content will be large, the current distortion is obvious, the efficiency is relatively low, and the control effect is poor; when the power is small, the efficiency will be greatly reduced, which not only reduces the working life of the switch tube in the PFC, but also shortens the car charger. life cycle

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