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A Control Circuit of Single Inductor Four Output Step-Down Switching Power Supply

A switching power supply and control circuit technology, applied in the output power conversion device, control/regulation system, DC power input conversion to DC power output, etc. The mechanism of the inductive multi-output converter is not yet clear, etc., to achieve the effect of easy circuit

Active Publication Date: 2015-12-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although after years of hard work, the performance of the dual-output converter has been significantly improved, only the output dynamic adjustment rate needs to be improved, but for the converter with three outputs and above, its conversion efficiency, output ripple, cross-interference and other performances remain the same. No improvement, the fundamental reason is that the mechanism of the single-inductance multi-output converter is not yet clear

Method used

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  • A Control Circuit of Single Inductor Four Output Step-Down Switching Power Supply
  • A Control Circuit of Single Inductor Four Output Step-Down Switching Power Supply

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Embodiment Construction

[0012] see figure 1 , the main loop adopts the common-mode peak current mode, and the input signal of the non-inverting terminal of the error amplifier EA1 is the reference voltage V REF1 , the input signal at the inverting terminal is 0.4 (V o1 +V o2 +V o3 +V O4 ), the output voltage of error amplifier EA1 V e Connect the inverting input terminal of the comparator COMP1, the current sampling voltage passes through the slope voltage V ramp0 Compensated voltage V sense Become the non-inverting input signal of comparator COMP1. The main-stage switch control signal is generated by the comparator COMP1 and the RS trigger TR1, and the on-off of the main-stage switch is controlled by the drive and dead zone control circuit, thereby adjusting the charging and discharging time of the circuit for the inductor. The secondary loop adopts the differential mode voltage mode, and the non-inverting input signal of the error amplifier EA2 is V o1 +V o2 , the inverting input signal is...

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Abstract

The invention relates to a control circuit of a single-inductor four-output step-down switching power supply. The control circuit comprises four output branches; the four output branches share the same inductor L; a primary control ring is in a common mode peak current mode, and a secondary control ring is in a differential mode voltage mode; the primary control ring comprises an error amplifier EA1, a comparator COMP1, an RS trigger TR1, a driver and a dead zone control circuit; the control circuit is characterized in that the secondary control ring divides a clock cycle into four units; metal-oxide-semiconductor (MOS) switch pipes Sp1, Sp2, Sp3 and Sp4 are correspondingly arranged on the output ends of the output branches for controlling the output voltage Vo1, Vo2, Vo3 and Vo4 of the four output branches; in each divided unit of the clock cycle, only one circuit of output voltage is regulated and controlled.

Description

Technical field: [0001] The invention relates to a switching power supply, in particular to a control circuit of a single-inductance four-output step-down switching power supply. Background technique: [0002] With the rapid development of mobile Internet and new display technologies, it is difficult for the existing power supply system to meet the high integration and high efficiency requirements of next-generation mobile information terminal products such as smart phones and tablet computers in the future. Single-inductor multiple-output DC power conversion technology has become a key research direction of system-on-chip integrated power solutions, which has attracted extensive attention from the academic community. Because this technology uses the energy sharing of the inductor, it will bring a series of problems such as the increase of cross-interference and ripple, and the reduction of conversion efficiency. Although after years of hard work, the performance of dual-ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 孙伟锋于花万中原张力文陆生礼徐申时龙兴
Owner SOUTHEAST UNIV