SiC power device-based EV (Electric vehicle)-mounted charger

Abstract

The invention discloses a SiC power device-based EV (Electric vehicle)-mounted charger. The charger comprises a main circuit and a control circuit; the main circuit comprises a rectifying and filtering module and an LLC resonant type DC / DC circuit; and the rectifying and filtering module is of a totem pole bridgeless power factor correction circuit structure and is directly connected with a three-phase alternating-current input power source; the LLC resonant type DC-DC circuit consists of a first half-bridge LLC converter and a second half-bridge LLC converter which are of the same topology, wherein the first half-bridge LLC converter and the second half-bridge LLC converter are connected in parallel and thereafter are connected in series between the rectifying and filtering module and anoutput side; the first half-bridge LLC converter and the second half-bridge LLC converter each include comprise a half-bridge inversion module, a high-frequency voltage transformation module, and a passive rectifying and filtering module; the rectifying and filtering module and the LLC resonant type DC-DC circuit are connected with the control circuit; and the control circuit adopts an average current control mode and a PFM control mode so as to realize digital control circuit output. The SiC power device-based EV (Electric vehicle)-mounted charger of the invention has the advantages of high power output precision, high power density, high reliability and small occupied space.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to an EV vehicle charger based on a SiC power device. Background technique [0002] With the continuous development of electric vehicle (Electric vehicle; EV) and plug-in hybrid electric vehicle (Plug-inhybrid electric vehicle; PHEV) technology, society's demand for fast charging capability is also increasing. While generally the industry trend is to use off-board charging stations to provide high-power DC charging to save on vehicle cost and weight, technological innovations through fast charging have greatly increased vehicle versatility, even in vehicles without charging stations. The charging work can also be completed under the infrastructure. [0003] The on-board charger is an electrical device installed on an electric vehicle, which converts the alternating current of the power grid into direct current that meets the requirements of the battery. As an on-board dev...

AI Technical Summary

Problems solved by technology

At present, most of the on-board chargers use a large number of topological devices, which will generate large losses during the operation of the on-board charger, resulting in low efficiency and serious heat generation.

On-board chargers generally use external fans for heat dissipation, which greatly reduces their reliability

In addition, power tubes based on Si materials are widely used in on-board chargers, which limits the increase in the operating frequency of on-board chargers, making the internal magnetic components of on-board chargers larger, which is not conducive to the miniaturization and light weight of on-board chargers

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