CN106771502A - A kind of circuit and method for improving source current overload protection ability - Google Patents
A kind of circuit and method for improving source current overload protection ability Download PDFInfo
- Publication number
- CN106771502A CN106771502A CN201710065867.9A CN201710065867A CN106771502A CN 106771502 A CN106771502 A CN 106771502A CN 201710065867 A CN201710065867 A CN 201710065867A CN 106771502 A CN106771502 A CN 106771502A
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- current
- circuit
- dcr
- overload protection
- inductance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
- G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a kind of circuit and method for improving source current overload protection ability, including DCR current sampling circuits, RC matching conversion circuit, operational amplification circuit；The current sampling circuit is sampled using simple and practical inductive current, performance transmission in real time output current or watt level；The RC matching conversion circuits network uses simple RC network, and space that need not be very big on PCB fabric swatch can connect up easily；The operational amplification circuit sends out instant current signal at any time without delay-time difference；All circuits improve the ability of over current protection speed without delay-time difference, and the present invention provides lossless sample circuit, reduces loss, improves efficiency；Application space is also small in the circuit board for the present invention, facilitates PCB to be laid out；DCR current detection circuits of the present invention are that load current, fast response time are measured using inductance parasitic resistance.
Description
Technical field
The present invention relates to a kind of circuit and method for improving source current overload protection ability.
Background technology
Switching Power Supply output needs inductance, to detect the usual Series detectors resistance of inductive current, and method is simply easily realized,
But there is power consumption, reduce efficiency, the temperature coefficient of resistance can change with the increase of electric current and working long hours, and detect
There is deviation in the current value for going out, influence testing result.
In using the conventional application of such scheme, have the following disadvantages：
1) increase power consumption, reduce overall efficiency, especially output current is than in larger circuit；
2) accuracy of the change influence measurement of temperature.
The content of the invention
The present invention is in order to solve the above problems, it is proposed that a kind of circuit for improving source current overload protection ability and side
Method, DCR current sampling circuits of the present invention are a kind of lossless sample circuits, and application space is also small on wiring board, DCR current detectings
Circuit is that load current is measured using inductance parasitic resistance, fast response time, and using overload protection, short-circuit protection has its only
Special advantage, it can remotely measure the electric current for flowing through inductance, conveniently be sent to remote supervisory and control(ling) equipment.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of circuit for improving source current overload protection ability, including DCR current sampling circuits, RC matching conversion electricity
Road, operational amplification circuit；The current sampling circuit is sampled using simple and practical inductive current, the output current of performance transmission in real time
Or watt level；RC matching conversion circuit network uses simple RC network, sky that need not be very big on PCB fabric swatch
Between can connect up easily；The operational amplification circuit sends out instant current signal at any time without delay-time difference；All circuits are equal
Without delay-time difference, the ability of over current protection speed is improved.
Partial pressure Vc (s)=DCR*IL on the electric capacity.
The electric capacity both positive and negative polarity distinguishes the both positive and negative polarity of concatenation operation amplifier.
The DCR current sampling circuits measure load current using inductance parasitic resistance.
A kind of method for improving source current overload protection ability, using DCR current sampling circuits sampling power source loads electricity
Stream, partial pressure is carried out using the partial pressure on the electric capacity of RC network to it, and sampling matching gained voltage is sent directly into operational amplifier.
The load current of DCR current sampling circuits collection flows through the DC internal resistance in inductance coil, while VL (s)=IL
(s*L+DCR), wherein, VL (s) inductance both end voltages, s=jw, I be flow through current value, L be inductance value, DCR be inductor wire
The DC internal resistance value of circle.
The RC network meets RC=L/DCR, and wherein R and C is respectively resistance value and capacitance in RC network, and L is electricity
Inductance value, DCR are the DC internal resistance value of inductance coil, and calculating reference inductive current carries out circuit protection.
Beneficial effects of the present invention are：
(1) present invention provides lossless sample circuit, reduces loss, improves efficiency；
(2) application space is also small in the circuit board for the present invention, facilitates PCB to be laid out；
(3) DCR current detection circuits of the present invention are that load current, response speed are measured using inductance parasitic resistance
Hurry up；
(4) present invention can remotely measure the electric current for flowing through inductance.
Brief description of the drawings
Fig. 1 is circuit diagram of the invention.
Specific embodiment：
The invention will be further described with embodiment below in conjunction with the accompanying drawings.
1st, power source loads electric current flows through inductance, equally flows through DCR in inductance coil
VL (s)=IL (s*L+DCR) s=jw (1)
Wherein, VL (s) inductance both end voltage, s=jw, I be flow through current value, L be inductance value, DCR be inductance coil
DC internal resistance value.
2nd, inductance two ends match a RC network, and partial pressure can be obtained on C：
Vc=VL/ (R+1/SC) * 1/SC (2)
3rd, RC times long number matching L/DCR time long numbers：
That is RC=L/DCR (3)
4th, derived by (1) (2) (3)：
Vc (s)=(s*L/DCR+1) * (DCR*IL)/(sRC+1)
Derive Vc (s)=DCR*IL
As long as the convenient reference inductive current that calculates of matching appropriate RC network (RC=L/DCR) carries out circuit protection, electric current inspection
Survey.
5th, voltage is directly sent to operational amplifier on sampling matching gained C.
6th, without time delay, any change of inductive current increases detection with protection response speed to post-amplifier.
This circuit is simple and practical, DCR current sampling circuits, RC matchings conversion circuit, operational amplification circuit；Each circuit
Without time delay, real-time sampling, real-Time Signal Transfer, real-time signal amplifies；All circuits are without delay-time difference, peak point current
Detection, improves the ability of over current protection speed.
Although above-mentioned be described with reference to accompanying drawing to specific embodiment of the invention, not to present invention protection model
The limitation enclosed, one of ordinary skill in the art should be understood that on the basis of technical scheme those skilled in the art are not
Need the various modifications made by paying creative work or deformation still within protection scope of the present invention.
Claims (7)
1. it is a kind of improve source current overload protection ability circuit, it is characterized in that：Matched including DCR current sampling circuits, RC
Conversion circuit, operational amplification circuit；The current sampling circuit is sampled using simple and practical inductive current, and performance transmission in real time is defeated
Go out electric current or watt level；The RC matching conversion circuits network uses simple RC network, need not be very on PCB fabric swatch
Big space can connect up easily；The operational amplification circuit sends out instant current signal at any time without delay-time difference；It is all
Circuit without delay-time difference, improves the ability of over current protection speed.
2. a kind of circuit for improving source current overload protection ability as claimed in claim 1, it is characterized in that：On the electric capacity
Partial pressure be the current value and inductance coil for flowing through internal resistance value product.
3. a kind of circuit for improving source current overload protection ability as claimed in claim 1, it is characterized in that：The electric capacity is just
Negative pole distinguishes the both positive and negative polarity of concatenation operation amplifier.
4. a kind of circuit for improving source current overload protection ability as claimed in claim 1, it is characterized in that：The DCR electricity
Stream sample circuit measures load current using inductance parasitic resistance.
5. it is a kind of improve source current overload protection ability method, it is characterized in that：Using DCR current sampling circuits sampling power supply
Load current, partial pressure is carried out using the partial pressure on the electric capacity of RC network to it, and sampling matching gained voltage is sent directly into computing
Amplifier.
6. a kind of method for improving source current overload protection ability as claimed in claim 5, it is characterized in that：DCR electric currents are adopted
The load current of sample circuit collection flows through the DC internal resistance in inductance coil, while VL (s)=IL (s*L+DCR), wherein, VL
S () inductance both end voltage, s=jw, I are current value, the DC internal resistance value that L is inductance value, DCR is inductance coil for flowing through.
7. a kind of method for improving source current overload protection ability as claimed in claim 5, it is characterized in that：The RC network
Meet RC=L/DCR, wherein R and C is respectively resistance value and capacitance in RC network, L is inductance value, DCR is inductance coil
DC internal resistance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710065867.9A CN106771502A (en) | 2017-02-06 | 2017-02-06 | A kind of circuit and method for improving source current overload protection ability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710065867.9A CN106771502A (en) | 2017-02-06 | 2017-02-06 | A kind of circuit and method for improving source current overload protection ability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106771502A true CN106771502A (en) | 2017-05-31 |
Family
ID=58956536
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710065867.9A Pending CN106771502A (en) | 2017-02-06 | 2017-02-06 | A kind of circuit and method for improving source current overload protection ability |
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| CN (1) | CN106771502A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261668A (en) * | 2018-03-12 | 2019-09-20 | 联合汽车电子有限公司 | Current detection circuit and detection method |
| CN110518799A (en) * | 2019-09-05 | 2019-11-29 | 北京集创北方科技股份有限公司 | Voltage conversion device, chip, power supply and electronic equipment |
| CN112763785A (en) * | 2020-12-24 | 2021-05-07 | 西安翔腾微电子科技有限公司 | Current detection circuit and method |
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| CN2632684Y (en) * | 2003-07-04 | 2004-08-11 | 港湾网络有限公司 | Non-loss current testing circuits |
| CN101079575A (en) * | 2006-05-24 | 2007-11-28 | 英特赛尔美国股份有限公司 | DC-DC converters having improved current sensing and related methods |
| US20090146643A1 (en) * | 2007-12-11 | 2009-06-11 | Primarion, Inc. | Methods and apparatus for current sensing |
| CN101789687A (en) * | 2010-03-23 | 2010-07-28 | 浙江大学 | Average current mode controller based on inductance current self-calibration lossless detection |
| CN101846702A (en) * | 2010-05-10 | 2010-09-29 | 伊博电源（杭州）有限公司 | Inductive current detection circuit |
| CN102621369A (en) * | 2012-03-22 | 2012-08-01 | 西安电子科技大学 | Inductance ESR (equivalent series resistance) based electric current detection circuit with potential floating function |
| CN103872915A (en) * | 2014-02-28 | 2014-06-18 | 台达电子企业管理（上海）有限公司 | DC (direct current)-DC converter and DC-DC converter system |
| CN105445524A (en) * | 2014-09-24 | 2016-03-30 | 凌力尔特公司 | Dcr current-sensing in four-switch buck-boost converters |
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2017
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2632684Y (en) * | 2003-07-04 | 2004-08-11 | 港湾网络有限公司 | Non-loss current testing circuits |
| CN101079575A (en) * | 2006-05-24 | 2007-11-28 | 英特赛尔美国股份有限公司 | DC-DC converters having improved current sensing and related methods |
| US20090146643A1 (en) * | 2007-12-11 | 2009-06-11 | Primarion, Inc. | Methods and apparatus for current sensing |
| CN101789687A (en) * | 2010-03-23 | 2010-07-28 | 浙江大学 | Average current mode controller based on inductance current self-calibration lossless detection |
| CN101846702A (en) * | 2010-05-10 | 2010-09-29 | 伊博电源（杭州）有限公司 | Inductive current detection circuit |
| CN102621369A (en) * | 2012-03-22 | 2012-08-01 | 西安电子科技大学 | Inductance ESR (equivalent series resistance) based electric current detection circuit with potential floating function |
| CN103872915A (en) * | 2014-02-28 | 2014-06-18 | 台达电子企业管理（上海）有限公司 | DC (direct current)-DC converter and DC-DC converter system |
| CN105445524A (en) * | 2014-09-24 | 2016-03-30 | 凌力尔特公司 | Dcr current-sensing in four-switch buck-boost converters |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110261668A (en) * | 2018-03-12 | 2019-09-20 | 联合汽车电子有限公司 | Current detection circuit and detection method |
| CN110518799A (en) * | 2019-09-05 | 2019-11-29 | 北京集创北方科技股份有限公司 | Voltage conversion device, chip, power supply and electronic equipment |
| CN112763785A (en) * | 2020-12-24 | 2021-05-07 | 西安翔腾微电子科技有限公司 | Current detection circuit and method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 250101 block B, Yinhe building, 2008 Xinjie street, hi tech Zone, Ji'nan, Shandong. Applicant after: Shandong Luneng Intelligent Technology Co., Ltd. Applicant after: State Grid Shandong Electric Power Company Weifang Power Supply Company Applicant after: State Grid Corporation of China Address before: 250101 B block 626, Yinhe building, 2008 Xinjie street, Ji'nan high tech Zone, Shandong. Applicant before: Shandong Luneng Intelligent Technology Co., Ltd. Applicant before: State Grid Shandong Electric Power Company Weifang Power Supply Company Applicant before: State Grid Corporation of China |
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| CB02 | Change of applicant information | ||
| CB02 | Change of applicant information |
Address after: 250101 Electric Power Intelligent Robot Production Project 101 in Jinan City, Shandong Province, South of Feiyue Avenue and East of No. 26 Road (ICT Industrial Park) Applicant after: National Network Intelligent Technology Co., Ltd. Applicant after: State Grid Shandong Electric Power Company Weifang Power Supply Company Applicant after: State Grid Corporation of China Address before: 250101 block B, Yinhe building, 2008 Xinjie street, hi tech Zone, Ji'nan, Shandong. Applicant before: Shandong Luneng Intelligent Technology Co., Ltd. Applicant before: State Grid Shandong Electric Power Company Weifang Power Supply Company Applicant before: State Grid Corporation of China |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170531 |