CN103593517A - Design method based on board-level power-supply current feedback circuit - Google Patents
Design method based on board-level power-supply current feedback circuit Download PDFInfo
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- CN103593517A CN103593517A CN201310530436.7A CN201310530436A CN103593517A CN 103593517 A CN103593517 A CN 103593517A CN 201310530436 A CN201310530436 A CN 201310530436A CN 103593517 A CN103593517 A CN 103593517A
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Abstract
The invention provides a design method based on a board-level power-supply current feedback circuit. According to the design method, four pins are adopted, the positions of two detection points are reserved, and network definitions of the power supply detection points and network definitions of the two ends of an inductor are separated in design; during component mounting, a pin of the inductor, an inductor bonding pad and detection point bonding pads are short-circuited. According to the design method, by means of reasonable design of packaging of the inductor, short-circuit pin devices are not used, accuracy of the power-supply feedback circuit is improved, schematic diagram designing and PCB designing efficiency is improved, the problems that PCB resistance affects design frequently and different positions of the short-circuit pin devices cannot keep current balance are solved, and the design method is beneficial to improving power supply design efficiency. The design method can be used for accurate feedback situations similarly. The design method is easy to implement and cannot increase cost.
Description
Technical field
The present invention relates to Computer Applied Technology field, specifically a kind of method for designing based on plate level power supply current feedback circuit.
Background technology
For high-current board level power supply, mostly adopt current feedback mechanism at present.The effect of current feedback, judges the size of current by flowing through on inductance by the voltage on detecting inductance DCR.
Following several aspects are considered in design for current feedback: 1, get rid of the resistance on PCB; 2, guarantee that the position of each power supply feedback is identical, keep current balance; 3, how precision is controlled enough little.
So conventionally in the field of business in the industry for design conventionally by the artificial detecting point of choosing, or adopt the form of short circuit pin device short circuit to choose current sense point.But manual control detecting point is wayward in precision, and error is larger; This method of form of employing short circuit pin device short circuit seems and has improved precision, but the error in the time of due to placement also can cause certain deviation to precision, the artificial short circuit pin device of placing, in order to pursue the accuracy of placement location, often spends a large amount of time.Therefore the method exists precision wayward, complicated shortcoming in design.The present invention does not consider choosing of parallel resistance.By the reasonable improvement to inductance encapsulation, the method for choosing accurate detecting point on raising pcb board improves the precision of source current feedback, to improve the efficiency of Power Management Design.
Summary of the invention
The object of this invention is to provide a kind of method for designing based on plate level power supply current feedback circuit.
The object of the invention is to realize in the following manner, adopt the method for 4 pins, the position of reserved two detectings point, in design electric power detecting point and the definition of inductance one-port are separated, in the time of upper, the pin of inductance itself carries out automatic short circuit to inductance pad and detecting point pad, and concrete steps are as follows:
Adopt 4 pin definitions, by the 3rd and the 4th pin definitions, it is current sense network Returning switch power supply chip, in PCB physics realization, employing is hollowed out by original traditional PCB encapsulation inner side, increase 10mil wide, length is according to the definition of inductance pad actual size, and inductance pad in kind has 1/3 on this pin.
The invention has the beneficial effects as follows: for power acquisition electric current feedback form, the present invention is by inductance, encapsulation reasonably designs, do not use short circuit pin device, improve power feedback precision, promote principle diagram design and PCB design efficiency, evade the impact on design of the PCB resistance that often occurs in this design, and the position difference of short circuit pin device can not keep the problem of current balance, be conducive to improve Power Management Design efficiency.The invention of this method for designing, can be used for the situation of accurate feedback equally.And the method easily realizes, do not increase cost.
Accompanying drawing explanation
Accompanying drawing 1 adopts the principle design of short circuit pin device design;
Accompanying drawing 2 adopts the principle design of this patent;
The traditional inductance PCB of accompanying drawing 3 package design;
The traditional inductance of accompanying drawing 4 adopts the PCB layout design of short circuit pin device current feedback;
The inductance PCB package design of accompanying drawing 5 this patents;
Accompanying drawing 6 this patent source current feedback PCB layout designs.
Embodiment
With reference to Figure of description, method of the present invention is described in detail below.
The encapsulation of general inductance only has two pins as shown in Figure 3, this invention, the method that we adopt 4 pins in design as shown in Figure 5, the positions of reserved two detecting points.In design electric power detecting point and the definition of inductance one-port are separated as shown in Figure 2, improve design realization property.In the time of upper, the pin of inductance itself carries out automatic short circuit to inductance pad and detecting point pad.This method for designing precision is in 1% left and right, than the precision of traditional low 1%-2% of method for designing.
In principle diagram design, adopt 4 pin definitions, by the 3rd and the 4th pin definitions, be current sense network Returning switch power supply chip.In PCB physics realization, adopt by original traditional PCB encapsulation inner side and hollow out, increase 10mil wide, length is according to the definition of inductance pad actual size, and inductance pad in kind has 1/3 on this pin conventionally, more reliable from processing and electrical resistance.
Except the technical characterictic described in instructions, be the known technology of those skilled in the art.
Claims (1)
1. the method for designing based on plate level power supply current feedback circuit, it is characterized in that adopting the method for 4 pins, the position of reserved two detectings point, in design electric power detecting point and the definition of inductance one-port are separated, in the time of upper, the pin of inductance itself carries out automatic short circuit to inductance pad and detecting point pad, and concrete steps are as follows:
Adopt 4 pin definitions, by the 3rd and the 4th pin definitions, it is current sense network Returning switch power supply chip, in PCB physics realization, employing is hollowed out by original traditional PCB encapsulation inner side, increase 10mil wide, length is according to the definition of inductance pad actual size, and inductance pad in kind has 1/3 on this pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310530436.7A CN103593517A (en) | 2013-11-01 | 2013-11-01 | Design method based on board-level power-supply current feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310530436.7A CN103593517A (en) | 2013-11-01 | 2013-11-01 | Design method based on board-level power-supply current feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103593517A true CN103593517A (en) | 2014-02-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310530436.7A Pending CN103593517A (en) | 2013-11-01 | 2013-11-01 | Design method based on board-level power-supply current feedback circuit |
Country Status (1)
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| CN (1) | CN103593517A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621045A (en) * | 2008-06-30 | 2010-01-06 | 海力士半导体有限公司 | Circuit substrate and its formation method and semiconductor encapsulation |
| CN103134422A (en) * | 2011-11-30 | 2013-06-05 | 上海市电力公司 | Testing device with four coplanar feet |
-
2013
- 2013-11-01 CN CN201310530436.7A patent/CN103593517A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621045A (en) * | 2008-06-30 | 2010-01-06 | 海力士半导体有限公司 | Circuit substrate and its formation method and semiconductor encapsulation |
| CN103134422A (en) * | 2011-11-30 | 2013-06-05 | 上海市电力公司 | Testing device with four coplanar feet |
Non-Patent Citations (1)
| Title |
|---|
| MARCUS O’SULLIVAN: "改进低值分流电阻的焊盘布局，优化高电流检测精度", 《ANALOG DIALOGUE》 * |
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| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140219 |