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Design method of a single-inductance double-output dc-dc step-down device and its step-down device

A single-inductor dual-output, DC-DC technology, applied in the field of electronics, can solve the problem that the voltage reducer is difficult to meet the design requirements, and achieve the effect of stable closed-loop response

Active Publication Date: 2022-06-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although there are many implementation methods for single-inductor multi-output DC-DC bucks, most of the design schemes only exist in the theoretical stage, or the bucks designed according to the theory are difficult to meet the design requirements.

Method used

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  • Design method of a single-inductance double-output dc-dc step-down device and its step-down device
  • Design method of a single-inductance double-output dc-dc step-down device and its step-down device
  • Design method of a single-inductance double-output dc-dc step-down device and its step-down device

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Experimental program
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Embodiment Construction

[0059] Step 1, according to the power stage topology circuit principle, build the power stage topology model of the buck in the simulation software.

[0061];

[0062];

[0063].

[0064] Step 2, according to the feedback control circuit principle, build the signal control model of the voltage reducer in the simulation software.

[0071] In the second step, the first error signal and the second error signal are added to obtain a third error signal, which is denoted as VCI.

[0079].

[0080] Wherein, is the voltage of the gate of the switch tube; is the inductance value of the inductance; is the parasitic resistance of the inductance.

[0082].

[0085] The phase margin of the current loop open-loop transfer function bandwidth is 55°-65°, and the gain is 10dB-15dB. Tool

[0088].

[0090].

[0091] Wherein, is the output resistance; is the output capacitance; is the parasitic resistance of the output capacitance.

[0093];

[0094].

[0102] A single-inductance dual-output DC-DC st...

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Abstract

The invention discloses a design method of a single-inductance double-output DC-DC voltage reducer, relates to electronic technology, and solves the problem that most of the current design schemes of the voltage reduction device only exist in the theoretical stage, or the voltage reduction device designed according to the theory is difficult. Technical issues that meet design requirements. According to the power stage topology circuit principle, the power stage topology model of the buck is constructed in the simulation software; according to the feedback control circuit principle, the signal control model of the buck is constructed in the simulation software; the power stage topology model and signal control The model is verified by simulation to obtain the performance parameters of the buck circuit. The invention also discloses a single inductance double output DC-DC voltage reducer. The invention realizes the transformation of the theory into a specific model, and after the simulation test, the closed-loop response after the compensation of the control loop can be made more stable, so that the design model meets the design requirements.

Description

A design method of a single-inductor dual-output DC-DC buck and its buck technical field The present invention relates to electronic technology, more specifically, it relates to a kind of design of single-inductance dual-output DC-DC step-down device The method and its voltage reducer. Background technique [0002] A single-inductance multi-output DC-DC buck (hereinafter referred to as a buck) requires fewer off-chip components to provide different output voltages. That is, each output branch shares a single inductor, so that different output branches can output different powers. The pressure function reduces the size and cost of the circuit. The system architecture of a single-inductor dual-output DC‑DC buck is generally divided into power Stage topology circuit and feedback control circuit part. Among them, the system architecture of the single-inductor dual-output DC‑DC buck is shown in Figure 1. It includes an inductor, a feedback control circuit (not shown in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155H02M3/158G06F30/367
CPCH02M3/155H02M3/158G06F30/367Y02B70/10
Inventor 吴心怡陈志坚张志荣李斌
Owner SOUTH CHINA UNIV OF TECH