Unlock instant, AI-driven research and patent intelligence for your innovation.

Cascaded step-up and step-down DC-DC converter

A DC-DC converter technology, applied in the field of buck-boost DC-DC converters, can solve problems such as current discontinuity, and achieve the effects of continuous input and output current, consistent polarity, and high efficiency

Pending Publication Date: 2019-02-26
ZHEJIANG UNIV OF TECH
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problem of current discontinuity inside the combination of Boost and Buck in the cascading scheme of the existing "input and output currents are continuous and input and output voltages are of the same polarity" DC-DC converter cascade scheme, the present invention provides A cascaded buck-boost DC-DC converter, which can achieve continuous input and output currents, continuous current between stages, and common ground for input and output, thereby expanding the types of buck-boost DC-DC converters

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cascaded step-up and step-down DC-DC converter
  • Cascaded step-up and step-down DC-DC converter
  • Cascaded step-up and step-down DC-DC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] refer to figure 1 and Figure 3 ~ Figure 5, a cascaded buck-boost DC-DC converter, including an inductor L1, a boost capacitor-inductor energy storage module, a step-down capacitor-inductor energy storage module and a capacitor Co, a boost capacitor-inductor The energy storage module has ports Via+, port Voa+, and port Gnda, and the step-down capacitive inductive energy storage module has ports Vib+, port Vob+, and port Gndb. One end of the capacitor Co is connected to one end of the load Z, and the other end of the load Z is simultaneously connected to the capacitor The other end of Co, the negative terminal of the DC power supply Vi, the port Gnda of the step-up capacitive inductive energy storage module and the port Gndb of the step-down capacitive inductive energy storage module are connected. The rest of the inductor energy storage module and the inductor L1 are located between the DC power supply Vi and the capacitor Co and are connected in series. The port Via+ ...

Embodiment 2

[0052] refer to figure 2 , image 3 , Figure 6 and Figure 7 , a cascaded buck-boost DC-DC converter, the port Vib+ of the step-down capacitive-inductive energy storage module is connected to the positive terminal of the DC power Vi, and the port Vob+ of the step-down capacitive-inductive energy storage module is connected to One end of the inductor L1 is connected, the other end of the inductor L1 is connected to the port Via+ of the boost capacitor-inductive energy storage module, and the port Voa+ of the boost capacitor-inductive energy storage module is connected to one end of the capacitor Co.

[0053] The controller a uses UC3842, etc., and the controller b uses a combination of UC3842 and IR2110, etc.

[0054] All the other structures of embodiment 2 are the same as embodiment 1.

[0055] When Embodiment 2 is in continuous conduction mode (CCM), its steady-state working process includes the following stages.

[0056] (1) When the N-type MOS transistor Mb_1 is tur...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A cascaded step-up and step-down DC-DC converter includes an inductor L1, one boost-type capacitive-inductive energy storage module, one step-down capacitive-inductive energy storage module and a capacitor Co. The boost-type capacitive-inductance energy storage module includes a diode Da_1, a capacitor Ca_1, an inductor La_1 and an electronic switch Sa. The step-down capacitive-inductive energy storage module includes a diode Db_1, a capacitor Cb_1, a diode Db_2, an inductor Lb_1 and an electronic switch Sb, the electronic switch Sa including a diode Da_2, an N-type MOS transistor Ma_1 and a controller a, the electronic switch Sb including a diode Db_3, an N-type MOS transistor Mb_1 and a controller b. The converter has the following working characteristics: simple circuit structure, various applicable control methods, continuous input and output currents, common ground and consistent polarity of output and input voltages, and output voltage Vo greater than or less than or equal to DCpower supply voltage Vi.

Description

technical field [0001] The present invention relates to a direct current-direct current (DC-DC) converter, especially a cascaded buck-boost DC-DC converter with continuous input and output currents and the same polarity of input and output voltages, which can be used as a basic unit 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 buck-boost function include Buck-Boost converter, Cuk converter, Sepic converter and Zeta converter. As listed in Table 1, without considering the output capacitor, none of the above four basic DC-DC converters with buck-boost function satisfy the requirements of "continuous input and output currents and the same polarity of input and output voltages". requirements. [0003] [0004] Table 1 [0005] By cascading the basic DC-DC converter, the Boost...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/07
CPCH02M3/07H02M3/1582H02M1/007
Inventor 陈怡
Owner ZHEJIANG UNIV OF TECH