Crossover Flying Capacitor Hybrid Buck-Boost DC-DC Converter Based on Dual Inductors

Abstract

The invention discloses a hybrid buck-boost DC-DC converter based on a dual-inductance cross-flying capacitor, comprising six switching devices S 1 ‑S 6 , the inductance L 1 , L 2 , the flying capacitor C F1 , C F2 ;S 1 ‑S 6 The gates are respectively connected to the control signal, S 1 The source is connected to the inductor L 1 one end of the flying capacitor C F1 the upper plate and S 3 the drain, S 1 The drain is connected to the voltage output terminal V out ;S 2 The source is connected to the inductor L 2 one end of the flying capacitor C F2 the upper plate and S 4 the drain, S 2 The drain is connected to the voltage output terminal V out , S 1 , S 2 A substrate selection circuit is arranged on the substrate; S 3 The source of the flying capacitor C is connected F2 the lower plate and S 6 the drain, S 3 The substrate is connected to its own source; S 4 The source of the flying capacitor C is connected F1 the lower plate and S 5 the drain, S 4 The substrate is connected to its own source; S 5 The source is grounded, S 5 The substrate is connected to ground; S 6 The source is connected to ground, S 6 The drain connection of S 3 The source and flying capacitors C F2 of the lower plate, S 6 The substrate is connected to ground; the inductance L 1 , inductance L 2 The other ends are connected to the voltage input terminal V in .

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a hybrid buck-boost DC-DC converter based on a dual-inductance cross-flying capacitor. Background technique [0002] In recent years, with the increasing use of high-performance mobile devices, high-efficiency power management integrated circuits (PMICs) have gradually become the focus of attention. In order to maintain high efficiency in mobile devices over a wide range of battery voltages, hybrid buck-boost DC -DC (direct current-direct current) converters have become a research hotspot. Due to the market demand for high-performance mobile devices, current consumption in chips (I Load ) becomes quite serious, since many high-performance load modules are required in mobile devices, in order to meet these high-performance requirements, the power management IC should be able to support large load currents (I Load ), the overload condition. When under heavy load conditions, ...

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Problems solved by technology

[0008] The purpose of the present invention is to provide a double-inductor-based cross-flying capacitor hybrid buck-boost DC-DC converter to solve the problems in the prior art such as the high sensitivity of the capacitor current to the duty cycle D and the insignificant drop in the inductor current. , high conduction loss, efficiency needs to be improved, etc.

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