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Single-inductance double-output switch power supply based on ripple control

A single-inductor dual-output, ripple control technology, applied in control/regulation systems, output power conversion devices, DC power input conversion to DC power output, etc., can solve the deterioration of intermodulation effects, slow transient response, secondary The complexity of the level loop control method and other issues, to achieve the effect of simplifying the control topology, fast response speed, and reducing cross-coupling

Inactive Publication Date: 2012-12-12
SOUTHEAST UNIV
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Problems solved by technology

The existing technology adopts the common-mode voltage to control the main loop current loop and the differential-mode voltage to control the secondary loop voltage loop. Although the dual-output SIMO structure can reduce cross-coupling to a certain extent, the secondary loop control method is complicated and the transient response is slow. The method of using flying capacitors in series between the two outputs to reduce the output ripple will worsen the intermodulation effect to a certain extent

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  • Single-inductance double-output switch power supply based on ripple control
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  • Single-inductance double-output switch power supply based on ripple control

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Embodiment Construction

[0026] see figure 1 The object of the present invention is to provide a single-inductance double-output step-down DC-DC converter with fast response, small ripple, low cross-coupling and high efficiency. Including power stage module 1, filtering and voltage sampling module 2, secondary voltage sampling module 3, secondary ripple control module 4, primary voltage sampling module 5, primary control module 6 and drive module 7. Power stage module 1 outputs V O1 , V O2 To the filtering and voltage sampling module 2, the filtering and voltage sampling module 2 outputs V 1 , V 2 to the secondary voltage sampling module 3 and the primary voltage sampling module 5 respectively, and the secondary voltage sampling module 3 outputs V + , V - To the secondary ripple control module 4, the primary voltage sampling module 5 outputs V M To the primary control module 6, the secondary ripple control module 4 and the primary control module 6 respectively output the duty cycle signal d 2 、d...

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Abstract

A single-inductance double-output switch power supply based on ripple control comprises a power level module, a filter and voltage sampling module, a secondary voltage sampling module, a secondary ripple control module, a primary voltage sampling module, a primary control module and a driving module, wherein the output of the power level module is connected with the filter and voltage sampling module, the output of the filter and voltage sampling module is connected with each of the secondary voltage sampling module and the primary voltage sampling module, the output of the secondary voltage sampling module is connected with the secondary ripple control module, the output of the primary voltage sampling module is connected with the primary control module, the outputs of the secondary ripple control module and the primary control module are connected with the driving module, and the output of the driving module is connected with the power level module and the secondary ripple control module and also outputs a slope compensation power source Islope signal to the secondary voltage sampling module.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a single-inductance multi-output switching power supply based on ripple control. Background technique [0002] Many electronic devices need to provide multiple independent power sources, and these electronic devices require efficient power management systems. Single-inductor multiple-output (SIMO) step-down DC-DC converters have become a hot topic in academia and industry because they can reduce the use of off-chip components (especially off-chip inductors) and thus reduce the size of power modules. and development direction. Although it can reduce the size of the power module, it also has the problems of large output ripple, low efficiency and cross modulation. For SIMO in practical applications, small ripple, low cross-coupling, high efficiency and fast transient response are the indicators that need the most attention. The existing technology adopts the common-mode v...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/158H02M1/14H02M2001/009H02M1/009
Inventor 孙伟锋杨淼李盼盼陆炎徐申陆生礼时龙兴
Owner SOUTHEAST UNIV
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