Cascaded step-down DC-DC converter

A DC-DC, step-down technology, applied in the direction of output power conversion device, DC power input conversion to DC power output, instruments, etc., can solve the problems of current discontinuity, input and output not sharing the same ground, etc., to achieve input The effect of continuous output current, consistent polarity, and simple circuit structure

Pending Publication Date: 2019-03-15
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Cascaded step-down DC-DC converter

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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 to Figure 4 , a cascaded step-down DC-DC converter, including a capacitor energy storage module 1 to a capacitor energy storage module n, an inductor L1 to an inductor Ln+1, and a capacitor Co, and the capacitor energy storage module j has a port Vij+, a port Voj+ and the port Gndj, one end of the inductor L1 is connected to the positive end of the DC power supply Vi, the other end of the inductor L1 is connected to the port Vi1+ of the capacitor energy storage module 1, the port Vo1+ of the capacitor energy storage module 1 is connected to one end of the inductor L2, and the inductor L2 The other end of the inductor Ln is connected to the port Vi2+ of the capacitor energy storage module 2, and so on. The other end of the inductor Ln is connected to the port Vin+ of the capacitor energy storage module n, and the port Von+ of the capacitor ener...

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Abstract

The invention relates to a cascaded step-down DC-DC converter. The cascaded step-down DC-DC converter comprises a capacitor energy storage module 1, a capacitor energy storage module 2, ... a capacitor energy storage module n, an inductor L1, an inductor L2, ... an inductor Ln+1, and a capacitor Co, wherein the capacitor energy storage module j comprises a diode Dj_1, a capacitor Cj_1, a diode Dj_2 and an electronic switch Sj, the electronic switch Sj comprises a diode Dj_3, an N type MOS transistor Mj_1, and a controller j, wherein j is between 1 and n. Working characteristics of the cascadedstep-down DC-DC converter are as follows: the converter has a simple circuit structure, is easy to expand, can be controlled by diversified methods, and is efficient, input and output currents are continuous, output and input voltages are common-grounded and are consistent in polarity, and an output voltage Vo is less than or equal to a 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): H02M3/158
CPCH02M3/1582H02M1/007
Inventor 陈怡
Owner ZHEJIANG UNIV OF TECH
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