Constant current-constant voltage composite topological sensing type charging system

Abstract

The invention relates to a constant current-constant voltage composite topological sensing type charging system which satisfies the charging feature of constant current first and constant voltage later and is adaptive to wireless charging occasions of electric cars, mobile phones and the like. The constant current-constant voltage composite topological sensing type charging system comprises a high-frequency inverter circuit, a constant current-constant voltage mode switching network, a primary side compensation capacitor, an additional inductor, a loosely-coupled transformer, a secondary side compensation capacitor and a rectifying and filter circuit. The constant current-constant voltage composite topological sensing type charging system has the advantages that during a whole charging process, a mode switching switch is simply controlled to directly provide constant currents and constant voltage required by battery charging without changing working frequency, using of extra last-stage converters, output features are irrelevant with loads, input impedance is pure resistive in the whole constant current-constant voltage charging process, so that the topological system can use simple constant-frequency duty ratio control, the zero voltage on and off of a high-frequency inverter switch are guaranteed, converter efficiency is increased, reactive power is avoided, device stress is reduced, and efficiency is further increased.

Description

technical field [0001] The invention relates to an inductive charging system of constant current-constant voltage composite topology, which is suitable for battery wireless charging occasions such as electric vehicles and mobile phones. Background technique [0002] Inductive wireless power transfer technology uses alternating electromagnetic fields as the medium to transfer energy to the load. Since there is no direct electrical contact, it can avoid electric sparks, is not affected by the environment, and can work in harsh environments. At present, inductive wireless power transfer technology has been widely used in consumer electronics, lighting, electric vehicles and other fields. Among them, charging the battery wirelessly is a very important application. [0003] There are 4 charging stages for battery charging, of which the constant current stage and constant voltage stage are the main stages. Therefore, the wireless charging device for the battery must be able to p...

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Problems solved by technology

[0005] Purpose of the invention: In order to solve the above problems, the present invention proposes two sets of inductive charging systems of constant current-constant voltage composite topologies: SS / PS and SP / PP composite topologies to solve the problem that a single control and a single topology cannot meet the design requirements. The cascading and multi-level control methods are low in efficiency and high in cost, and the technical problems of multi-structure switching in the way of multiple topological combinations

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