Electric vehicle, on-board charger, control method and control device thereof

Abstract

The present invention proposes an electric vehicle, an on-board charger and its control method and control device, wherein the method includes: obtaining the current allowable charging power of the on-board charger; determining the conduction phase number of the PFC circuit according to the current allowable charging power; When the charger is recharging, the temperature of the first phase of the PFC circuit, the temperature of the second phase of the PFC circuit, the temperature of the third phase of the PFC circuit and the temperature of the fourth phase of the PFC circuit are obtained, and according to the conduction of the PFC circuit The number of phases, the temperature of the first phase, the temperature of the second phase, the temperature of the third phase and the temperature of the fourth phase control the on and off of the first phase to the fourth phase in the PFC circuit, so as to control the The switching tubes in the PFC circuit are temperature-balanced controlled to realize the distribution control of temperature and power, thereby optimizing the efficiency, and making the heat generation of each switching tube relatively balanced, improving the working life of the switching tubes in the PFC circuit and prolonging the vehicle. Charger life cycle.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to an electric vehicle, a vehicle charger and a control method and control device thereof. 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, characteristics such as PF (power factor) and THD (harmonic content) of the on-board charger have also become important performance indicators to measure the performance of the on-board charger. [0003] In order to reduce the ripple current and harmonic content of the current on the AC side, the related technology proposes a scheme of using multi-phase interleaved PFC on the AC side for power factor correction. During the entire charging process, the multi-phase PFC, interleaved. [0004] However, the problem with the related technology is that, under any working conditions, all t...

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Problems solved by technology

[0004] However, the problem with the related technology is that, under any working conditions, all the switching devices in the front-stage PFC are in the high-frequency operating state. Therefore, when the AC side current is small, the control effect is poor, and the AC side current harmonics are reversed. It is much larger than single-phase, and the efficiency is low when the power is low

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