CN108521119A - A kind of current foldback circuit of resistance multiplexing - Google Patents
A kind of current foldback circuit of resistance multiplexing Download PDFInfo
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- CN108521119A CN108521119A CN201810559463.XA CN201810559463A CN108521119A CN 108521119 A CN108521119 A CN 108521119A CN 201810559463 A CN201810559463 A CN 201810559463A CN 108521119 A CN108521119 A CN 108521119A
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- pipes
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- grid
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- drain electrode
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
- H02H9/025—Current limitation using field effect transistors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Semiconductor Integrated Circuits (AREA)
Abstract
The invention discloses a kind of current foldback circuits of resistance multiplexing, including：One biasing circuit, provides bias voltage and bias current；As soon as core protection circuit detects that overcurrent carries out current-limiting protection automatically；Whether normally-open one self-checking circuit detects the core protection circuit.A kind of current foldback circuit of the present invention has many advantages, such as overcurrent turn-off function small power consumption, reliability height and high conversion efficiency.
Description
Technical field
The present invention relates to protection circuit fields, more particularly to a kind of current foldback circuit of circuit multiplexer.
Background technology
With the rapid development of electronic technology, DC/DC converters are widely used in various mobile electronic systems, such as move
Mobile communication terminal, portable computer, PDA etc..And the one kind of LDO linear voltage regulators as DC/DC converters, due to its structure
Simply, it of low cost, the advantages that noise is low, low in energy consumption and package dimension is smaller, is answered extensively in portable electronic product
With.
Current protection technology in LDO is always to influence the key of LDO system stable operations.The purpose of overcurrent protection be for
Output current is limited in a fixed range, whole system or load are protected in output short-circuit or overload
Shield.However, all there is the problems such as some such as reliabilities, overcurrent turn-off function power consumption, limit in current foldback circuit more commonly used at present
The application range of these current foldback circuits is made.
Invention content
To overcome the above-mentioned problems of the prior art, the main purpose of the present invention is to provide a kind of mistakes of resistance multiplexing
Stream protection circuit, has overcurrent turn-off function small power consumption, and reliability is high, high conversion efficiency, and comparison circuit precision is adjustable, and resistance is multiple
With, and have many advantages, such as self-checking circuit.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions：
A kind of current foldback circuit of resistance multiplexing, including：One biasing circuit, provides bias voltage and bias current；One core
Circuit is protected, detects that overcurrent carries out current-limiting protection with regard to automatic；Whether normal one self-checking circuit detects the core protection circuit
It opens, and coordinates and adjust its accuracy of detection.
The biasing circuit is by the first PMOS tube PM1, the second PMOS tube PM2, third PMOS tube PM3, the 4th PMOS tube
PM4, the first NMOS tube NM1, the second NMOS tube NM2, third NMOS tube NM3, the 4th NMOS tube NM4 and first resistor R1 are constituted；
The source electrode of PM1 pipes and the source electrode of PM3 pipes connect input voltage VIN, and the grid of PM1 pipes and the grid of PM3 pipes connect GND, the leakage of PM1 pipes
Grade is connected with the source electrode of PM2 pipes, and the drain of PM3 pipes is connected with the source electrode of PM4 pipes, the grid of the grid and PM4 pipes of PM2 pipes
Pole, the drain electrode of PM2 pipes, the drain electrode of NM2 pipes are connected with the grid of NM2 pipes；The source electrode of NM2 pipes is connected with the drain electrode of NM1 pipes；
The drain electrode of PM4 pipes is connected with the drain electrode of the grid of NM4 pipes and NM4 pipes；The source electrode of NM4 pipes and the grid of NM1 pipes, NM3 pipes
Grid is connected with the drain electrode of NM3 pipes；One end of the source electrode connection resistance R1 of NM1 pipes；The source of the other end and NM3 pipes of resistance R1
Pole is all grounded.
The core protection circuit is by the 5th PMOS tube PM5, the 6th PMOS tube PM6, the 7th PMOS tube PM7, the 8th PMOS
Pipe PM8, the 9th PMOS tube PM9, the tenth PMOS tube PM10, the 11st PMOS tube PM11, the 12nd PMOS tube PM12, the 13rd
PMOS tube PM13, the 5th NMOS tube NM5, the 6th NMOS tube NM6, the first capacitance C1, the 4th resistance R4 and the 5th resistance R5；PM5
The source electrode of pipe, the source electrode of PM7 pipes, the source electrode of PM9 pipes, the source electrode of PM11 pipes, the source electrode of PM12 pipes and PM13 pipes source electrode all connect
It is connected to input voltage VIN；The grid of PM5 pipes connects the source electrode of the drain electrode connection PM6 pipes of input control signal CT5, PM5 pipe；PM6 is managed
Grid be connected with the grid of the grid of PM2 pipes, the grid of PM8 pipes and PM10 pipes；The drain electrode of PM6 pipes to drain with PM8 pipes,
The drain electrode of PM10 pipes, the drain electrode of NM5 pipes are connected with the grid of PM12 pipes；The grid connection input control signal CT1 of PM7 pipes；
The source electrode of the drain electrode connection PM8 pipes of PM7 pipes；The grid connection input control signal CT2 of PM9 pipes；The drain electrode of PM9 pipes connects PM10
The source electrode of pipe；The grid of PM11 pipes is connected with one end of the drain electrode of PM12 pipes, the grid of PM13 pipes and capacitance C1；PM11 pipes
Drain electrode connection the grid of NM6 pipes, the drain of NM6 pipes, NM5 pipes grid and resistance R4 one end, node label A；PM13
One end drain electrode connection resistance R5 of pipe, node is as output end VOUT；The other end of capacitance C1, other one section of resistance R4
It links together with the other end of resistance R5；The source electrode of NM5 pipes and the source electrode of NM6 pipes are all grounded.
The biasing circuit, it is characterised in that PM1 is managed and the grounded-grid of PM3 pipes, can improve the standard of current mirror
True property reduces the error of bias current and bias voltage.
The core protection circuit, it is characterised in that there are three branch currents, are the electric current for flowing through PM6 respectively, flow through
The electric current of PM8 and the electric current for flowing through PM10, it is using therein electric all the way which can adjust according to test result
Stream or two-way electric current or three road electric currents, the branch current are controlled by input control voltage CT5, CT1 and CT3 respectively；It should
The current relationship in three tributaries is 1：2：4, the electric current being finally combined into is that 1-7 times of bias current is adjustable so that more electric
Stream has larger adjusting range, also can more accurately come decision circuitry whether overcurrent, if need starting protection.
The core protection circuit, it is characterised in that resistance R4, resistance R5 and capacitance C1, resistance R4 and R5 series connection are later
So that A points are consistent with VOUT point voltages, while the composition of capacitance C1 and resistance R5, the phase margin of the system can be improved, greatly
Improve its system stability greatly, improves the reliability of system；Capacitance C1 is compensating electric capacity, and resistance R5 is zero-regulator resistor, resistance
R5 plays the role of two, and resistance R5 is re-used.
The current foldback circuit of a kind of resistance multiplexing, which is characterized in that the self-checking circuit is by the 14th PMOS
Pipe PM14, the 7th NMOS tube NM7, the 8th NMOS tube NM8, second resistance R2 and 3rd resistor R3 are constituted；The source electrode of PM14 pipes connects
Meet node VOUT；One end of the drain electrode of the grid connection PM14 pipes of PM14 pipes, the drain electrode and resistance R2 of NM7 pipes；The grid of NM7 pipes
Connect input control signal CT3；The source electrode connection drain electrode of NM8 pipes of NM7 pipes, the other end and resistance R3 of resistance R2 one end；
The grid connection input control signal CT4 of NM8 pipes；The source electrode of the resistance R3 other ends and NM8 pipes is all grounded.
Description of the drawings
The attached drawing constituted part of this application is used to provide further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.In the accompanying drawings：
Fig. 1 is a kind of current foldback circuit figure of resistance multiplexing of the present invention.
Specific implementation mode
The present invention is described in further detail with specific implementation mode below in conjunction with the accompanying drawings：
In conjunction with shown in Fig. 1, in the following embodiments, a kind of current foldback circuit of resistance multiplexing, including：
One biasing circuit, provides bias voltage and bias current；As soon as core protection circuit detects that overcurrent carries out current limliting automatically
Protection；Whether one self-checking circuit, it is normally-open to detect the core protection circuit, and coordinates and adjust its accuracy of detection.
The biasing circuit is managed by PM2, PM4 pipes, NM1 pipes, NM2 pipes, NM3 pipes, NM4 pipes and resistance R1 are constituted；The NM2
Pipe and NM4 pipes weaken influence of the fluctuation of VIN voltage to generation bias current and bias voltage for being isolated.NM2 is managed and NM4
Pipe is all diode connection type, and be equivalent to has a diode drop herein so that PM1 pipes, PM2 pipes, PM3 pipes, PM4 pipes, NM1
The source-drain voltage of pipe and NM3 pipes will not be especially big, and channel length modulation effect is minimized by way of reducing source-drain voltage
Cope with the influence of bias current.
Concatenated metal-oxide-semiconductor can influence the accuracy of image current, and PM1 manages the grounded-grid with PM3 pipes in biasing circuit, just
It is to reduce the error of bias current and bias voltage for the accuracy of better matching current mirror image.Current mirror when
It waits, since PM6 pipes branch, PM8 pipes branch and PM10 pipe branches are required for by PM5 pipes, PM7 pipes and PM9 management and control systems, PM5
Pipe, PM7 pipes and PM9 manage either conducting state still by state, can all generate pressure drop between source and drain, thus PM1 pipes with
PM3 pipes are exactly to ensure the source voltage one of PM2 pipes, PM4 pipes, PM6 pipes, PM8 pipe and PM10 pipes as possible to match its pressure drop
It causes, the electric current to ensure PM6 pipes, PM8 pipes and PM10 pipe mirror images as possible is more accurate.
What whether PM5 pipes, PM7 pipes and PM9 pipes accessed for switching control electric current.These three branch currents are stream respectively
The electric current of PM6 is crossed, the electric current of PM8 is flowed through and flows through the electric current of PM10, which can adjust according to test result is
Using electric current all the way therein or two-way electric current or three road electric currents, the branch current respectively by input control voltage CT5,
The control of CT1 and CT3；The current relationship in three tributaries is 1：2：4, it can be bias current to be finally combined into the electric current come
1-7 times so that comparing electric current has larger adjusting range, also can more accurately come decision circuitry whether overcurrent, if need
Want starting protection.The electric current of PM8 pipes, is controlled by CT1, and CT1 is height, then no current in PM8 pipes, CT1 is low, then PM8 is managed
In have an electric current, PM10 pipes and PM5 tubings are seemingly.PM5 pipes, PM8 pipes and PM10 pipe branches are exactly to modulate according to specific needs
The size for comparing electric current can also increase several branch currents more in actual design.
The electric current of PM11 pipes flows through NM6 pipes, which is mirrored to again in NM5 pipes, flow through NM5 pipes electric current and PM6 pipes,
PM8 is managed, the electric current of PM10 pipes compares.If the electric current for flowing through PM13 pipes is big, the electric current for flowing through PM11 pipes also becomes larger, that
The final electric current for flowing through NM5 pipes just becomes larger, and the grid voltage of PM12 pipes will be lower, and then just draws the grid of PM13 pipes
It is high so that the electric current for flowing through PM13 pipes becomes smaller, and achievees the purpose that current limliting.Additional work(need not be consumed in entire turn off process
Then consumption provides comparison result to be managed to control PM12, therefore overcurrent turn-off function due to only being compared using two-way low current
Small power consumption, high conversion efficiency.
In core protection circuit, resistance R4 and R5 are connected across between A points and VOUT points, the resistance can make A points and
VOUT point voltages are consistent, are equivalent to clamper A points and VOUT points, and method is simply easy to implement, which is generally 500k ohm
Left and right, not only can clamper can also reduce its power consumption.The composition of capacitance C1 and resistance R5 simultaneously, can improve the system
Phase margin, substantially improve its system stability, improve the reliability of system, capacitance C1 is compensating electric capacity, and resistance R5 is
Zero-regulator resistor, resistance R5 play the role of two, and resistance R5 is re-used.In design, the general resistance that adjusts is 20k-100k ohm
Between, occurrence needs depending on technique and pipe sizing.After designing resistance R5, need to design R4 electricity further according to clamper
Resistance, can just ensure not only to complete clamping action in this way, but also complete adjustment phase place nargin or so, it is also possible that resistance R5 is answered
With.Such as zero-regulator resistor R5 needs 50k ohm, then R4 can be designed to 450k ohm；If zero-regulator resistor R5 needs
100k ohm, then R4 can be designed to 400k ohm.
The voltage of resistance R4 and R5 clamper A point and VOUT so that the two voltage is consistent, ensures the accuracy using electric current,
The electric current of the electric current and PM13 pipes that ensure to flow through PM11 pipes is proportional, such as electric current in PM13 pipes is 10mA, and size is
10000um/0.18um, then the metal-oxide-semiconductor size 1um/0.18um of setting PM11 pipes, the electric current for flowing through PM11 pipes is exactly 1uA.It allows
A points are consistent with VOUT point voltages, then PM11 pipes and PM13 pipes, three terminal voltages are just consistent, can ensure two as far as possible
Person's electric current is 10000 times of relationship.
The self-checking circuit is managed by PM14, NM7 pipes, NM8 pipes, resistance R2 and resistance R3 are constituted；PM14 below the ends VOUT
Guan and resistance R2, R3, be the self-test of core protection circuit, be exactly under normal condition, can be controlled by external voltage CT3 and
CT4, NM7 pipe are connected, and the load at the ends VOUT reduces, and the electric current for flowing through PM13 pipes increases suddenly, and whether test current foldback circuit
Normally-open current limliting, and for PM8 pipes are found in adjustment, the electric current of PM10 pipes should be arranged how much, find one it is accurate
Matching current, to adjust the default value of CT1, CT2 and CT5.CT4 is also same principle, in order to further calibrate electric current and survey
Try self-checking function.In actual design process, self-checking circuit can design the more control items of more Multi- Switch, so as to reach more
Accurate self-test and adjustment is added to compare electric current.The adjustment of self-checking circuit and three tributary circuits is combined into a self checking and oneself
Adjustment system, therefore global reliability is high.
Although the present invention is illustrated using specific embodiment, the present invention's is not intended to limit to the explanation of embodiment
Range.One skilled in the art is by reference to explanation of the invention, without departing substantially from the spirit and scope of the present invention
In the case of, it is easy to carry out various modifications or embodiment can be combined.
Claims (7)
1. a kind of current foldback circuit, which is characterized in that including：One biasing circuit, provides bias voltage and bias current；One core
The heart protects circuit, detects that overcurrent carries out current-limiting protection with regard to automatic；Whether just one self-checking circuit detects the core protection circuit
It is normally open, and coordinate and adjust its accuracy of detection.
2. a kind of current foldback circuit as described in claim 1, which is characterized in that the biasing circuit is by the first PMOS tube
PM1, the second PMOS tube PM2, third PMOS tube PM3, the 4th PMOS tube PM4, the first NMOS tube NM1, the second NMOS tube NM2,
Three NMOS tube NM3, the 4th NMOS tube NM4 and first resistor R1 are constituted；The source electrode of PM1 pipes and the source electrode of PM3 pipes connect input voltage
The grid of VIN, PM1 pipe and the grid of PM3 pipes meet GND, and the drain of PM1 pipes is connected with the source electrode of PM2 pipes, the drain of PM3 pipes
It is connected with the source electrode of PM4 pipes, grid and the grid of PM4 pipes, the drain electrode of PM2 pipes, the drain electrode of NM2 pipes and the NM2 pipes of PM2 pipes
Grid is connected；The source electrode of NM2 pipes is connected with the drain electrode of NM1 pipes；The drain electrode of the drain electrode and the grid and NM4 pipes of NM4 pipes of PM4 pipes
It is connected；The source electrode of NM4 pipes is connected with the drain electrode of the grid of NM1 pipes, the grid of NM3 pipes and NM3 pipes；The source electrode of NM1 pipes connects
One end of connecting resistance R1；The other end of resistance R1 and the source electrode of NM3 pipes are all grounded.
3. a kind of current foldback circuit as described in claim 1, which is characterized in that the core protection circuit is by the 5th PMOS
Pipe PM5, the 6th PMOS tube PM6, the 7th PMOS tube PM7, the 8th PMOS tube PM8, the 9th PMOS tube PM9, the tenth PMOS tube PM10,
11st PMOS tube PM11, the 12nd PMOS tube PM12, the 13rd PMOS tube PM13, the 5th NMOS tube NM5, the 6th NMOS tube
NM6, the first capacitance C1, the 4th resistance R4 and the 5th resistance R5；The source electrode of PM5 pipes, the source electrode of PM7 pipes, PM9 pipes source electrode,
The source electrode of the source electrode of PM11 pipes, the source electrode of PM12 pipes and PM13 pipes is all connected to input voltage VIN；The grid of PM5 pipes connects input
Control the source electrode of the drain electrode connection PM6 pipes of signal CT5, PM5 pipe；The grid of PM6 pipes and the grid of PM2 pipes, PM8 pipes grid and
The grid of PM10 pipes is connected；The drain electrode of PM6 pipes is managed with the drain electrode of PM8 pipes, the drain electrode of PM10 pipes, the drain electrode of NM5 pipes and PM12
Grid be connected；The grid connection input control signal CT1 of PM7 pipes；The source electrode of the drain electrode connection PM8 pipes of PM7 pipes；PM9 is managed
Grid connection input control signal CT2；The source electrode of the drain electrode connection PM10 pipes of PM9 pipes；The grid of PM11 pipes and PM12 pipes
It drains, the grid of PM13 pipes is connected with one end of capacitance C1；The leakage of the grid, NM6 pipes of the drain electrode connection NM6 pipes of PM11 pipes
One end of grade, the grid of NM5 pipes and resistance R4, node label A；One end drain electrode connection resistance R5 of PM13 pipes, node
As output end VOUT；The other end of the other end of capacitance C1, other one section of resistance R4 and resistance R5 links together；
The source electrode of NM5 pipes and the source electrode of NM6 pipes are all grounded.
4. the biasing circuit as described in profit requires 2, it is characterised in that PM1 is managed and the grounded-grid of PM3 pipes, can improve current mirror
The accuracy of picture reduces the error of bias current and bias voltage.
5. core protection circuit as claimed in claim 3, it is characterised in that there are three branch currents, flow through PM6 respectively
Electric current, the electric current for flowing through PM8 and the electric current for flowing through PM10, it is using wherein which can adjust according to test result
Electric current all the way or two-way electric current or three road electric currents, the branch current is respectively by input control voltage CT5, CT1 and CT3
Control；The current relationship in three tributaries is 1：2：4, the electric current being finally combined into is that 1-7 times of bias current is adjustable, is made
Electric current, which must be compared, larger adjusting range, also can more accurately come decision circuitry whether overcurrent, if need start protect
Shield.
6. the core protection circuit as described in profit requires 3, it is characterised in that resistance R4, resistance R5 and capacitance C1, resistance R4 and R5
Series connection made A points consistent with VOUT point voltages later, while the composition of capacitance C1 and resistance R5, can improve the phase of the system
Nargin substantially improves its system stability, improves the reliability of system；Capacitance C1 is compensating electric capacity, and resistance R5 is zeroing electricity
Resistance, resistance R5 play the role of two, and resistance R5 is re-used.
7. a kind of current foldback circuit as described in claim 1, which is characterized in that the self-checking circuit is by the 14th PMOS tube
PM14, the 7th NMOS tube NM7, the 8th NMOS tube NM8, second resistance R2 and 3rd resistor R3 are constituted；The source electrode of PM14 pipes connects
Node VOUT；One end of the drain electrode of the grid connection PM14 pipes of PM14 pipes, the drain electrode and resistance R2 of NM7 pipes；The grid of NM7 pipes connects
Meet input control signal CT3；The source electrode connection drain electrode of NM8 pipes of NM7 pipes, the other end and resistance R3 of resistance R2 one end；NM8
The grid connection input control signal CT4 of pipe；The source electrode of the resistance R3 other ends and NM8 pipes is all grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810559463.XA CN108521119A (en) | 2018-06-02 | 2018-06-02 | A kind of current foldback circuit of resistance multiplexing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810559463.XA CN108521119A (en) | 2018-06-02 | 2018-06-02 | A kind of current foldback circuit of resistance multiplexing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108521119A true CN108521119A (en) | 2018-09-11 |
Family
ID=63427959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810559463.XA Pending CN108521119A (en) | 2018-06-02 | 2018-06-02 | A kind of current foldback circuit of resistance multiplexing |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109885122A (en) * | 2019-03-16 | 2019-06-14 | 珠海泰芯半导体有限公司 | A kind of current-limiting circuit for low-voltage low voltage difference LDO |
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|---|---|---|---|---|
| CN101256421A (en) * | 2007-12-27 | 2008-09-03 | 北京中星微电子有限公司 | Current limitation circuit as well as voltage regulator and DC-DC converter including the same |
| CN102074942A (en) * | 2009-11-25 | 2011-05-25 | 深圳艾科创新微电子有限公司 | Overcurrent protection circuit |
| CN206848850U (en) * | 2017-06-29 | 2018-01-05 | 英麦科（厦门）微电子科技有限公司 | A kind of low pressure difference linear voltage regulator of super low-power consumption |
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2018
- 2018-06-02 CN CN201810559463.XA patent/CN108521119A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101256421A (en) * | 2007-12-27 | 2008-09-03 | 北京中星微电子有限公司 | Current limitation circuit as well as voltage regulator and DC-DC converter including the same |
| CN102074942A (en) * | 2009-11-25 | 2011-05-25 | 深圳艾科创新微电子有限公司 | Overcurrent protection circuit |
| CN206848850U (en) * | 2017-06-29 | 2018-01-05 | 英麦科（厦门）微电子科技有限公司 | A kind of low pressure difference linear voltage regulator of super low-power consumption |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109885122A (en) * | 2019-03-16 | 2019-06-14 | 珠海泰芯半导体有限公司 | A kind of current-limiting circuit for low-voltage low voltage difference LDO |
| CN109885122B (en) * | 2019-03-16 | 2023-09-26 | 珠海泰芯半导体有限公司 | Current limiting circuit for low-voltage low-dropout LDO |
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Application publication date: 20180911 |