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

Current-regulation isolated type DC-DC converter

A DC converter and current regulation technology, applied in the field of electronics, can solve problems such as difficulty in realizing low-cost and high-performance functions, incompetence of forward DC-DC, and small input voltage variation range.

Inactive Publication Date: 2013-06-05
魏其萃
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the duty cycle, the input voltage variation range of the forward type is relatively small
For wide input voltage Vin applications, the forward DC-DC is difficult to do
[0005] In multiple accurate current source output applications, such as LED lighting applications, flyback and forward power topology circuit structures are difficult to achieve low-cost high-performance functions

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
  • Current-regulation isolated type DC-DC converter
  • Current-regulation isolated type DC-DC converter
  • Current-regulation isolated type DC-DC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1. A current-regulated isolated DC-DC converter, such as figure 2 As shown, it includes step-down switch SA, freewheeling diode DA, step-down inductor L, switch S (for MOSFETs, usually with its body diode D. The diode D does not play any role in the circuit), clamping circuit Vc, DC blocking capacitor Cd, output diodes D3 and D4, output filter capacitor C, output load R and switching transformer T;

[0032] One end of the step-down inductor L is connected to the step-down switch SA and the freewheeling diode DA, and the other end is connected to the switch S; the other end of the switch S is connected to the freewheeling diode DA; the primary winding of the switching transformer T is connected in series with the DC blocking capacitor Cd connected; the primary winding Np of the switching transformer T and the DC blocking capacitor Cd are connected in parallel with the switch S; the freewheeling diode DA and the step-down switch SA are connected in series and ...

Embodiment 2

[0044] Embodiment 2. A current-regulated isolated DC-DC converter, such as Figure 4 shown, which is the same as the above figure 2 Said embodiment 1 has only the following difference: due to the switching transformer isolation function of the cost-effective isolated current-mode DC-DC converter of the present invention, the step-down switch SA can be driven in a low-cost common-ground driving manner.

Embodiment 3

[0045] Embodiment 3, a kind of current adjustment type isolated DC-DC converter, such as Figure 5 shown, which is the same as the above figure 2 The above-mentioned embodiment 1 has only the following difference: in the application of large current output, the output diodes D3 and D4 can be replaced by synchronous rectifier MOSFETs S3 and S4. Since D3 and D4 are turned on at a 50% duty cycle, it is very easy to drive S3 and S4 in a low-cost self-driven manner.

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

The invention discloses a current regulation isolated type DC-DC converter, comprising a buck switch SA, a flywheel diode DA, a buck inductor L, a switch S with a self-supporting diode D, a clamping circuit Vc, a blocking capacitor Cd, output diodes D3 and D4, an output filter capacitor C, an output load R and a switch transformer T. Based on a buck current type DC-DC converter, the converter also obtains the isolation function of the switch transformer; moreover, the converter maintains the voltage pressure of an element, adjusts the duty ratio of the element to 100%, and has high cost performance.

Description

technical field [0001] The invention belongs to the field of electronic technology and relates to the topological structure of an isolated DC-DC converter. More specifically, the present invention relates to a new high-performance and low-cost current-regulated isolated DC-DC converter. Background technique [0002] In quite a lot of DC-DC converter applications, due to the requirements of the application environment, it is often necessary to isolate the input and output of the DC-DC converter; usually it is done by a switching transformer. In some applications, due to the large input-to-output voltage ratio, in order to increase the efficiency of the DC-DC converter, the turn ratio of the high-frequency switching transformer is usually used to optimize the operation of the DC-DC converter, so that the DC-DC conversion The efficiency of the device can be improved accordingly. In the application of small and medium power isolated DC-DC converters, flyback and forward are th...

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 Patents(China)
IPC IPC(8): H02M3/28H02M3/335H02M3/156
Inventor 翁大丰
Owner 魏其萃