CN108631270A - A kind of current foldback circuit with self-test - Google Patents
A kind of current foldback circuit with self-test Download PDFInfo
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- CN108631270A CN108631270A CN201810559462.5A CN201810559462A CN108631270A CN 108631270 A CN108631270 A CN 108631270A CN 201810559462 A CN201810559462 A CN 201810559462A CN 108631270 A CN108631270 A CN 108631270A
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- pipes
- grid
- source electrode
- drain electrode
- current
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/1213—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for DC-DC converters
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a kind of current foldback circuits with self-test, including：One biasing circuit, provides bias voltage and bias current；One core protection circuit substantially increases the sampling precision to output current, to improve the reliability of circuit using the empty short empty disconnected principle of operational amplifier；Whether normally-open one self-checking circuit detects the core protection circuit.The advantages that a kind of current foldback circuit of the present invention has overcurrent turn-off function small power consumption, and reliability is high, band self-checking function and high conversion efficiency.
Description
Technical field
The present invention relates to protection circuit fields, more particularly to a kind of current foldback circuit with self-test.
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 in current foldback circuit more commonly used at present,
There are some circuits to lose the also external ignorant situation of overcurrent protection ability, limit these current foldback circuits applies model
It encloses.
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 overcurrents with self-test
Circuit is protected, there is overcurrent turn-off function small power consumption, reliability is high, high conversion efficiency, and comparison circuit precision is adjustable, has self-test electricity
The advantages that road.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions：
A kind of current foldback circuit with self-test, including：One biasing circuit, provides bias voltage and bias current；One core is protected
Protection circuit substantially increases the sampling precision to output current, to improve electricity using the empty short empty disconnected principle of operational amplifier
The reliability on road；Whether normally-open one self-checking circuit detects the core protection circuit.
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 9th NMOS tube NM9, the first capacitance C1 and an operational amplifier
It constitutes；The source electrode of PM5 pipes, 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 is all connected to input voltage VIN；The grid of PM5 pipes connects the source of the drain electrode connection PM6 pipes of input control signal CT5, PM5 pipe
Pole；The grid of PM6 pipes is connected with the grid of the grid of PM2 pipes, the grid of PM8 pipes and PM10 pipes；The drain electrode of PM6 pipes and PM8
The drain electrode of pipe, the drain electrode of PM10 pipes, the drain electrode of NM5 pipes are connected with the grid of PM12 pipes；The grid of PM7 pipes connects input control
Signal CT1；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
Connect the source electrode of PM10 pipes；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；
The drain electrode of the in-phase input end and NM9 pipes of the drain electrode connection operational amplifier of PM11 pipes, node label A；The leakage of PM13 pipes
Pole connects the inverting input of the other end and operational amplifier of capacitance C1, and node is as output end VOUT；Operational amplifier
Output end connection NM9 pipes grid；The source electrode of NM9 pipes is connected with the drain electrode of the grid of NM5 pipes, the grid of NM6 pipes and NM6 pipes
It connects；The source electrode of NM5 pipes and the source electrode of NM6 pipes are all grounded.
The biasing circuit, wherein PM1 are managed and the grounded-grid of PM3 pipes, can improve the accuracy of current mirror, subtract
The error of small bias current and bias voltage.
The core protection circuit, there are three branch current, be the electric current for flowing through PM6 respectively, flow through PM8 electric current and
The electric current of PM10 is flowed through, it is to use electric current all the way therein or two-way which can adjust according to test result
Electric current or three road electric currents, the branch current are controlled by input control voltage CT5, CT1 and CT3 respectively；Three tributaries
Current relationship is 1：2：4, it is 1-7 times of bias current adjustable to be finally combined into the electric current come so that compare electric current have it is larger
Adjusting range, also can more accurately come decision circuitry whether overcurrent, if need starting protection.
The self-checking circuit is by the 14th PMOS tube PM14, the 7th NMOS tube NM7, the 8th NMOS tube NM8, second resistance R2
It is constituted with 3rd resistor R3；The source electrode connecting node VOUT of PM14 pipes；The drain electrode of the grid connection PM14 pipes of PM14 pipes, NM7 pipes
Drain electrode and resistance R2 one end；The grid connection input control signal CT3 of NM7 pipes；The leakage of the source electrode connection NM8 pipes of NM7 pipes
Pole, the other end of resistance R2 and resistance R3 one end；The grid connection input control signal CT4 of NM8 pipes；The resistance R3 other ends and
The source electrode of 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 with self-test 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 with self-test, including：One biased electrical
Road provides bias voltage and bias current；One core protection circuit is greatly improved using the empty short empty disconnected principle of operational amplifier
To the sampling precision of output current, to improving the reliability of circuit；One self-checking circuit detects the core protection circuit
It is whether normally-open.
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.Capacitance C1 is stability capacitance.
The core protection circuit, operational amplifier are used for the voltage of clamper A point and VOUT so that the two voltage one
It causes, ensures the accuracy using electric current, that is, ensure that the electric current of the electric current for flowing through PM11 pipes and PM13 pipes is proportional, such as PM13 pipes
In electric current be 10mA, size is 10000um/0.18um, then setting PM11 pipes metal-oxide-semiconductor size 1um/0.18um, flow through
The electric current of PM11 pipes is exactly 1uA.Make A points consistent with VOUT point voltages, then PM11 pipes and PM13 pipes, three terminal voltages are exactly consistent
, it can ensure that the two electric current is 10000 times of relationship as far as possible.Amplifier is used, it, can be more preferable although circuit is more complex
Clamper A point and the ends VOUT voltage so that the two voltage is consistent.
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, accuracy can also be higher.
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 (6)
1. a kind of current foldback circuit with self-test, which is characterized in that including：One biasing circuit, provides bias voltage and biasing
Electric current；One core protection circuit substantially increases the sampling essence to output current using the empty short empty disconnected principle of operational amplifier
Degree, to improve the reliability of circuit；Whether normally-open one self-checking circuit detects the core protection circuit.
2. a kind of current foldback circuit with self-test as described in claim 1, which is characterized in that the biasing circuit is by 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 defeated
The grid of the grid and PM3 pipes that enter voltage VIN, PM1 pipe meets GND, and the drain of PM1 pipes is connected with the source electrode of PM2 pipes, PM3 pipes
Drain be connected with the source electrode of PM4 pipes, the grids of PM2 pipes and the grid of PM4 pipes, the drain electrode of PM2 pipes, the drain electrode of NM2 pipes and
The grid of NM2 pipes is connected；The source electrode of NM2 pipes is connected with the drain electrode of NM1 pipes；The grid and NM4 of the drain electrode and NM4 pipes of PM4 pipes
The drain electrode of pipe 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；NM1 is managed
Source electrode connection resistance R1 one end；The other end of resistance R1 and the source electrode of NM3 pipes are all grounded.
3. a kind of current foldback circuit with self-test as described in claim 1, which is characterized in that the core protection circuit by
5th PMOS tube 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, the 11st PMOS tube PM11, the 12nd PMOS tube PM12, the 13rd PMOS tube PM13, the 5th NMOS tube NM5,
6th NMOS tube NM6, the 9th NMOS tube NM9, the first capacitance C1 and an operational amplifier are constituted；The source electrodes of PM5 pipes, PM7 pipes
Source electrode, the source electrode of PM9 pipes, the source electrode of PM11 pipes, the source electrode of PM12 pipes and PM13 pipes source electrode be all 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；The grid of PM6 pipes and PM2 pipes
Grid, PM8 pipes grid be connected with the grid of PM10 pipes；The drain electrode of PM6 pipes and the drain electrodes of PM8 pipes, the drain electrode of PM10 pipes,
The drain electrode of NM5 pipes is connected with the grid of PM12 pipes；The grid connection input control signal CT1 of PM7 pipes；The drain electrode of PM7 pipes connects
Connect the source electrode of PM8 pipes；The grid connection input control signal CT2 of PM9 pipes；The source electrode of the drain electrode connection PM10 pipes of PM9 pipes；PM11
The grid of pipe is connected with one end of the drain electrode of PM12 pipes, the grid of PM13 pipes and capacitance C1；The drain electrode of PM11 pipes connects operation
The drain electrode of the in-phase input end and NM9 pipes of amplifier, node label A；The other end of the drain electrode connection capacitance C1 of PM13 pipes
With the inverting input of operational amplifier, node is as output end VOUT；The grid of the output end connection NM9 pipes of operational amplifier
Pole；The source electrode of NM9 pipes is connected with the drain electrode of the grid of NM5 pipes, the grid of NM6 pipes and NM6 pipes；The source electrode and NM6 of NM5 pipes are managed
Source electrode be 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. a kind of current foldback circuit with self-test as described in claim 1, which is characterized in that the self-checking circuit is by the tenth
Four PMOS tube PM14, the 7th NMOS tube NM7, the 8th NMOS tube NM8, second resistance R2 and 3rd resistor R3 are constituted；PM14 pipes
Source electrode connecting 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；NM7 is managed
Grid connection input control signal CT3；The source electrode of NM7 pipes connects the drain electrode of NM8 pipes, the other end of resistance R2 and resistance R3's
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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810559462.5A CN108631270A (en) | 2018-06-02 | 2018-06-02 | A kind of current foldback circuit with self-test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810559462.5A CN108631270A (en) | 2018-06-02 | 2018-06-02 | A kind of current foldback circuit with self-test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108631270A true CN108631270A (en) | 2018-10-09 |
Family
ID=63691029
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810559462.5A Pending CN108631270A (en) | 2018-06-02 | 2018-06-02 | A kind of current foldback circuit with self-test |
Country Status (1)
| Country | Link |
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| CN (1) | CN108631270A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110176856A (en) * | 2019-07-03 | 2019-08-27 | 上海南芯半导体科技有限公司 | A kind of zero quiescent current, power switch circuit and implementation method with overcurrent protection |
| CN111366776A (en) * | 2020-04-02 | 2020-07-03 | 常州瑞创电器科技有限公司 | Over-current detection method of solar air conditioner controller |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2018
- 2018-06-02 CN CN201810559462.5A patent/CN108631270A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|---|---|---|---|
| CN110176856A (en) * | 2019-07-03 | 2019-08-27 | 上海南芯半导体科技有限公司 | A kind of zero quiescent current, power switch circuit and implementation method with overcurrent protection |
| CN111366776A (en) * | 2020-04-02 | 2020-07-03 | 常州瑞创电器科技有限公司 | Over-current detection method of solar air conditioner controller |
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Application publication date: 20181009 |
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