Wide-range single-inductor multiple-output converter

Abstract

The invention provides a wide-range single-inductor multiple-output converter which comprises a main power circuit, a follow current loop, a switching element and a feedback control circuit. When a secondary side current is is reduced to a follow current reference value, a switching tube S2 is closed, an original current is kept at a constant value through the switching tube S2 and a diode Dfw until a switching tube S1 is switched on again; the switching element is used for controlling on-off of the circuit and guaranteeing that the circuit works in a pseudo continuous electric conduction mode, and meanwhile all output branched circuits multiplex one transformer in a time-division mode. The feedback control circuit is connected with the switching element and the main power circuit and used for feeding back, controlling and adjusting output voltage or currents of all the output branched circuits, and therefore the output voltage or the currents are kept constant. The converter is simple in structure, small in size, low in cost capable of achieving wide-range output and beneficial to improving production efficiency, components are few, and no intersection influence exists among all the output branched circuits.

Description

technical field [0001] The invention relates to electric power supply equipment, especially power supply equipment requiring multiple levels of power supply voltages and avoiding cross-effects between different levels of power supply voltages, and in particular to a wide-range single-inductance multi-output converter. Background technique [0002] Portable electronic products such as mobile phones require multiple power supply voltages of different levels. However, a multi-output switching converter with multiple output windings has serious cross-effects between outputs. All output branches of the single-inductance multi-output switching converter share one magnetic element, which can realize precise regulation of all output branches and reduce the volume and cost of the converter. The working characteristics of the converter are related to the working mode. When the single-inductor multiple-output converter works in the discontinuous conduction mode, there is no cross effec...

AI Technical Summary

Problems solved by technology

The working characteristics of the converter are related to the working mode. When the single-inductor multiple-output converter works in the discontinuous conduction mode, there is no cross effect between the output branches, but there are disadvantages of large inductor current ripple and stress under heavy load conditions. Continuous conduction mode multi-output converter has strong load capacity, but there is cross influence between output branches

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