Augmented multi-stage boost converter

Abstract

A boost converter may include a first stage comprising a first dual anti-wound inductor constructed such that its windings generate opposing magnetic fields in its magnetic core, and a second stage comprising a second dual anti-wound inductor constructed such that its windings generate opposing magnetic fields in its magnetic core. The boost converter may also include control circuitry for controlling the first stage and the second stage to have a plurality of phases comprising a first phase wherein a first coil of the first dual anti-wound inductor and a second coil of the second dual anti-wound inductor are coupled in parallel between a power supply and a ground voltage and a second phase wherein the first coil of the first dual anti-wound inductor and the second coil of the second dual anti-wound inductor are coupled in series between the power supply and the ground voltage.

Description

technical field [0001] The present disclosure relates generally to circuits for audio devices, piezoelectric devices, haptic feedback devices, and / or other devices, including but not limited to personal audio devices such as wireless phones and media players, and more particularly, to a Enhanced multilevel boost converters that can be used in such devices. Background technique [0002] Personal audio devices including wireless phones (such as mobile / cellular phones, cordless phones), mp3 players and other consumer audio devices are in widespread use. Such personal audio devices may include circuitry for driving a pair of earphones, one or more speakers, piezoelectric transducers, haptic feedback transducers, and / or other transducers. Such circuitry typically includes a driver including a power amplifier for driving the transducer output signal to the transducer. Typically, a power converter may be used to provide a supply voltage to a power amplifier for amplifying signals...

AI Technical Summary

Problems solved by technology

Therefore, when the control signal P1 is active, the inductor 100 of the second stage 401b may experience a larger voltage drop, and this may cause Figure 5B shows the large current difference I1-STAGE2–I2-STAGE2

[0021] Therefore, neither the single-stage boost converter 200 nor the two-stage boost converter 400 can satisfy the saturation constraint of the inductor 100 for the desired application

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