Hybrid capacitor and inductor charger architecture and charging mode switching control method thereof

Abstract

The invention discloses hybrid capacitor and inductor charger architecture and a charging mode switching control method thereof, and mainly solves the problem that the existing switched capacitor charger cannot work under the condition of fixed input high voltage and is limited in application occasion. The charger architecture comprises ten power transistors, five capacitors and one inductor in total, wherein the power transistors Q1-Q8, the capacitor CFLY1 / CFLY2 and the inductor L are the main body of the charger and realize voltage and current power conversion; the power transistor Q9 is used for preventing reverse current flowing from the battery side to the VBUS and is in a constant conduction mode under normal conditions; the power transistor Q10 realizes detection and protection of charging current, works in a linear control mode in a trickle charging stage, and works in a constant conduction mode in a constant-current and constant-voltage charging stage; the capacitors C1, C2 and C3 are filter capacitors. According to the design, the high-power and high-efficiency charging under the fixed high-voltage input condition is achieved, additional protocol chips are not required tobe additionally arranged at the adapter end and the mobile phone end, and the cost is reduced. Therefore, the charger architecture is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery chargers, in particular to a hybrid capacitor-inductor charger architecture and a charging mode switching control method thereof. Background technique [0002] Due to the demand for high-power charging of electronic devices such as mobile phones, the current charger architecture is rapidly developing in the direction of high-power. When the charging power reaches a certain level, the traditional buck charging architecture cannot meet the requirements due to its low efficiency. [0003] Such as figure 1 As shown, it is the solution selected by most mobile phone manufacturers in the high-power charging architecture, including a main charger (buck charger) and a slave charger (switched capacitor charger). Among them, the buck charger works in the trickle charging and constant voltage charging stages of the entire charging cycle, and the switched capacitor charger works in the constant c...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a hybrid capacitor inductance charger architecture and its charging mode switching control method, which mainly solves the problem that the existing switched capacitor charger cannot work under the condition of fixed input high voltage and the application occasions are limited

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