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Cascaded step-down DC-DC converter

A DC-DC, step-down technology, used in output power conversion devices, DC power input conversion to DC power output, instruments, etc. And the output current is continuous, the polarity is consistent, and the circuit structure is simple.

Inactive Publication Date: 2019-02-26
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the current discontinuity in the combination of Speic and Buck and the combination of Speic and Zeta in the existing step-down DC-DC converter cascading scheme of "the input and output currents are continuous and the input and output voltages are of the same polarity" Problems and the combination of Cuk and Cuk have the problem that the input and output are not common ground. The present invention provides a cascaded step-down DC-DC converter, which can realize continuous current between stages and common ground between input and output, so that Expansion of cascaded types of DC-DC converters

Method used

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Embodiment Construction

[0023] The present invention will be further described below in conjunction with the accompanying drawings.

[0024] refer to Figure 1 ~ Figure 4 , a cascaded step-down DC-DC converter, including a capacitor-inductor energy storage module 1 to a capacitor-inductor energy storage module n, an inductor L1 to an inductor Ln-1, and a capacitor Co, and the capacitor-inductor energy storage module j has a port Vij+ , port Voj+ and port Gndj, the port Vi1+ of the capacitive-inductive energy storage module 1 is connected to the positive terminal of the DC power Vi, the port Vo1+ of the capacitive-inductive energy storage module 1 is connected to one end of the inductor L1, and the other end of the inductor L1 is connected to the capacitor-inductive energy storage The other end of the inductor Ln-1 is connected to the port Vin+ of the capacitive inductive energy storage module n, and the port Von+ of the capacitive inductive energy storage module n is connected to one end of the capac...

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Abstract

A cascaded step-down DC-DC converter includes capacitive inductance energy storage modules 1 to n, inductors L1 to Ln-1, and a capacitor Co. The capacitive inductance energy storage module j includesa diode Dj_1, a capacitor Cj_1, a diode Dj_2, an electronic switch Sj, and an inductor Lj_1. The electronic switch Sj includes a diode Dj_3, an N-type MOS transistor Mj_1, and a controller j, the value range of j being 1 to n. The converter has the following working characteristics: simple circuit structure, easy expansion, various applicable control methods, high efficiency, continuous input andoutput currents, common ground and consistent polarity of output and input voltages, and output voltage Vo less than or equal to DC power supply voltage Vi.

Description

technical field [0001] The invention relates to a DC-DC (DC-DC) converter, in particular to a cascaded step-down DC-DC converter with continuous input and output currents and the same polarity of input and output voltages, which can be used as a high-voltage step-down Compared with the basic unit to build a multi-input and multi-output DC power system, such as: DC power module parallel system, LED array drive system, distributed photovoltaic power generation system, etc. Background technique [0002] The existing basic DC-DC converters with step-down function include Buck converter, Buck-Boost converter, Cuk converter, Sepic converter and Zeta converter. As listed in Table 1, without considering the output capacitor, none of the above five basic DC-DC converters with step-down function satisfies the requirement of "continuous input and output currents and the same polarity of input and output voltages". Require. [0003] [0004] Table 1 [0005] Cascading is a common ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
CPCH02M3/155H02M1/007
Inventor 陈怡
Owner ZHEJIANG UNIV OF TECH
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