CN102891466B - Over-voltage over-current protection circuit - Google Patents
Over-voltage over-current protection circuit Download PDFInfo
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- CN102891466B CN102891466B CN201110207257.0A CN201110207257A CN102891466B CN 102891466 B CN102891466 B CN 102891466B CN 201110207257 A CN201110207257 A CN 201110207257A CN 102891466 B CN102891466 B CN 102891466B
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- 230000001681 protective effect Effects 0.000 claims abstract description 20
- 238000001514 detection method Methods 0.000 claims abstract description 5
- 230000005611 electricity Effects 0.000 claims description 10
- 238000000465 moulding Methods 0.000 claims description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Abstract
A kind of over-voltage over-current protection circuit, including: a connectivity port is powered to a load for accessing a power supply；This circuit also includes: an overvoltage protection switch and an overcurrent protective switch, for being respectively turned on or end the connection of this connectivity port and this load；One reference voltage module, for output one reference voltage level；One over-voltage and over-current detecting module, for detection path current and the load voltage of load in real time；One comparison module, for compare this over-voltage and over-current detecting module output load voltage and this reference voltage module output reference voltage level, when more than time, control this overvoltage protection switch and disconnect the connection of this connectivity port and this load；When less than time, turn on the connection of this connectivity port and this load；One current control module, for controlling, according to the path current of this over-voltage and over-current detecting module detecting, the connection that this overcurrent protective switch disconnects or turns on this connectivity port and this load.It is thus possible to prevent from, at over-voltage and over-current, load is caused damage.
Description
Technical field
The present invention relates to a kind of circuit, particularly to a kind of over-voltage over-current protection circuit.
Background technology
At present, general consumer electronics product easily produces moment in power initiation or operation
Excessive electric current can be produced under overvoltage, or load short circuits or overload situations, thus electronics is produced
Product circuit causes damage, it is therefore necessary to increases a kind of over-voltage over-current protection circuit in circuit and comes
Increase the safety of circuit.
Summary of the invention
In view of this, it is provided that a kind of over-voltage over-current protection circuit, it is possible to prevent at over-voltage and over-current pair
Load causes damage.
A kind of over-voltage over-current protection circuit, including: a connectivity port is for accessing a power supply to one
Load is powered；This over-voltage over-current protection circuit also includes: an overvoltage protection switch, is used for leading
Lead to or end the connection of this connectivity port and this load；One overcurrent protective switch, for conducting or
End the connection of this connectivity port and this load；One reference voltage module, for output one reference
Magnitude of voltage；One over-voltage and over-current detecting module, between this overcurrent protective switch and ground, is used for
Path current in detection outgoing route and output are to the load voltage loaded in real time；One compares mould
Block, equal with this reference voltage module, this over-voltage and over-current detecting module and this overvoltage protection switch
It is connected, for comparing load voltage and this reference voltage mould of the output of this over-voltage and over-current detecting module
The reference voltage level of block output, when the load voltage of this over-voltage and over-current detecting module output is more than being somebody's turn to do
During reference voltage level, export a pressure limiting signal, control this overvoltage protection switch and disconnect this connection end
Mouthful with the connection of this load；When the load voltage of this over-voltage and over-current detecting module output is less than this ginseng
When examining magnitude of voltage, export a stationary signal, turn on the connection of this connectivity port and this load；One
Current control module, is all connected with this over-voltage and over-current detecting module and this overcurrent protective switch,
Path current for detecting according to this over-voltage and over-current detecting module controls this overcurrent protective switch
Disconnect or turn on the connection of this connectivity port and this load.
When overvoltage, i.e. the load voltage of this over-voltage and over-current detecting module output is more than this reference electricity
During pressure value, control this overvoltage protection switch and disconnect the connection of this connectivity port and this load.Serve as
During stream, when i.e. the path current of this over-voltage and over-current detecting module output is excessive, controls this and cross stream guarantor
Protect the connection switching off this connectivity port with this load.It is thus possible to prevent at over-voltage and over-current pair
Load causes damage.
Accompanying drawing explanation
Fig. 1 is the module rack composition of over-voltage over-current protection circuit better embodiment.
Fig. 2 is the physical circuit figure of over-voltage over-current protection circuit better embodiment.
Main element symbol description
| Over-voltage over-current protection circuit | 1 |
| Connectivity port | 10 |
| Reference voltage module | 20 |
| Over-voltage and over-current detecting module | 30 |
| Comparison module | 40 |
| Overvoltage protection switch | 50 |
| Current control module | 60 |
| Overcurrent protective switch | 70 |
| Load | 80 |
| Power supply | 90 |
| Positive pole incoming end | 101 |
| Negative pole incoming end | 102 |
| Comparator | 401 |
| Low level conducting switch | 501 |
| High level conducting switch | 701 |
| First high level conducting switch | 601 |
| Second high level conducting switch | 602 |
Following detailed description of the invention will further illustrate the present invention in conjunction with above-mentioned accompanying drawing.
Detailed description of the invention
Refer to Fig. 1, for the module rack composition of over-voltage over-current protection circuit 1 better embodiment.
This over-voltage over-current protection circuit 1 includes connectivity port 10, reference voltage module 20, mistake
Press through stream detecting module 30, comparison module 40, overvoltage protection switch 50, electric current control
Molding block 60, one overcurrent protective switch 70 and a load 80.This connectivity port 10 is used for accessing
One power supply 90.This overvoltage protection switch 50 and this overcurrent protective switch 70 are positioned at this connectivity port
Between 10 and load 80, for the connection of on or off connectivity port 10 with load 80.
This reference voltage module 20 is connected with this comparison module 40, for providing a reference voltage
To this comparison module 40.This over-voltage and over-current detecting module 30 and this comparison module 40 and this electricity
Flow control module 60 is all connected with, for detecting the electric current in outgoing route (hereinafter referred to as: path
Electric current) and the voltage (hereinafter referred to as: load voltage) of output extremely load, and by this detection
The path current of detection, to comparison module 40, is exported to current control module by load voltage output
60。
This comparison module 40 is for comparing what this load voltage and this reference voltage module 20 provided
Reference voltage, and export a pressure limiting signal according to this comparative result or a stationary signal controls this mistake
The cut-off of pressure protection switch 50 or conducting, disconnect or turn on the company of connectivity port 10 and load 80
Connect, thus disconnect or the connection of turn-on power 90 and load 80.This current control module 60 is also
It is connected with this overcurrent protective switch 70, for according to this path current, controls this overcurrent protection and open
Close cut-off or the conducting of 70, thus disconnect or the connection of turn-on power 90 and load 80.Thus,
Realized stream and overvoltage protection.
Refer to Fig. 2, for the physical circuit figure of over-voltage over-current protection circuit 1 better embodiment.
This connectivity port 10 includes positive pole incoming end 101 and negative pole incoming end 102, for connecting respectively
Connect the both positive and negative polarity of power supply 90.This reference voltage module 20 include a three terminal regulator TL431,
An one resistance R1 and resistance R2.The reference pole 1 of this three terminal regulator TL431 is by this electricity
Resistance R1 is connected with positive pole incoming end 101 and this comparison module 40 of this connectivity port 10, and leads to
Crossing this resistance R2 ground connection, anode 2 ground connection, negative electrode 3 accesses with the positive pole of this connectivity port 10
End 101 is connected, and in present embodiment, the voltage stabilization of reference pole 1 is 2.5V, if this resistance
The resistance value of R1 is R1, and the resistance value of this resistance R2 is R2, if this resistance R1 is away from this
One end of the reference pole of TL431 provides end REF for reference voltage, if this reference voltage provides end
The voltage of REF is VREF, then this reference voltage provides the voltage V of end REFREFMagnitude of voltage
For VT1* (R1+R2)/R2, it is 2.5* (R1+R2)/R2.
This over-voltage and over-current detecting module 30 is between ground and this overcurrent protective switch 70.This mistake
Press through stream detecting module and include an a resistance R3 and resistance R4, this resistance R3 and this resistance R4
It is serially connected with between overcurrent protective switch 70 and ground, and resistance R4 is closely.This resistance R4 with
This load is in parallel.The path current of this over-voltage and over-current detecting module 30 detecting is for flowing through this resistance
The electric current of R3.The electricity that load voltage is this resistance R4 of this over-voltage and over-current detecting module 30 detecting
Pressure.Wherein, if resistance R3 is node A away from one end of resistance R4, resistance R3 is near electricity
One end of resistance R4 is node B, then this load voltage is the voltage of node B.
This comparison module 40 is a comparator 401, the normal phase input end of this comparator 401 with should
Node B connects, and the negative-phase input of this comparator 401 and this reference voltage provide end REF even
Connecing, the outfan of this comparator 401 is connected with this overvoltage protection switch 50.
This overvoltage protection switch 50 is a low level conducting switch 501.In the present embodiment,
This low level conducting switch 501 is PMOS Q1.The source electrode of this PMOS Q1 with should
The positive pole incoming end 101 of connectivity port 10 is connected, and the drain electrode of this PMOS Q1 crosses stream with this
Protection switch 70 is connected, the outfan phase of the grid of this PMOS Q1 and this comparator 401
Even.
This overcurrent protective switch 70 includes a resistance R5 and high level conducting switch 701.
In the present embodiment, this high level conducting switch 701 is NMOS tube Q2.This resistance
R5 is connected between the grid of this NMOS tube Q2 and drain electrode.The grid of this NMOS tube Q2
Also it is connected with this current control module 60.The drain electrode of this NMOS tube Q2 also with this PMOS
The drain electrode of pipe Q1 is connected, and the source electrode of this NMOS tube Q2 is connected with this node A.
This current control module 60 includes one first high level conducting switch 601 and one second high electricity
Flat conducting switch 602.In the present embodiment, this first high level conducting switch 601 is one
NMOS tube Q3, this second high level conducting switch 602 is a NPN audion Q4.Should
The grid of NMOS tube Q3 is connected with this node B, the drain electrode of this NMOS tube Q3 and this joint
The source electrode of some A and this NMOS tube Q2 connects, i.e. resistance R3 is connected to this NMOS tube Q3
Drain electrode and grid between.The source electrode of this NMOS tube Q3 and the base of this NPN audion Q4
Pole connects, and by a resistance R6 ground connection.The grounded emitter of this NPN audion Q4,
The colelctor electrode of this NPN audion Q4 is connected with the grid of this NMOS tube Q2.
When connecting circuit, when circuit is in and normally works, when i.e. there is no stream or overvoltage.
This comparator 401 compares the load voltage of this over-voltage and over-current detecting module 30 detecting less than this reference
Voltage, thus export a low level stationary signal to the grid of this PMOS Q1, thus
This PMOS Q1 is turned on.Meanwhile, when there is no stream, flow through the electric current of resistance R3
Less than a predetermined value, thus the undertension at resistance R3 two ends is so that this NMOS tube Q3
Conducting, thus the base stage of NPN audion Q4 obtains a low electricity by this resistance R6 ground connection
Flat, thus this NPN audion Q4 cut-off.The grid of this NMOS tube Q2 is by this resistance
PMOS Q1 of R5 and this conducting is connected with the positive pole incoming end 101 of connectivity port 10,
Thus the grid of this NMOS tube Q2 is high potential, this NMOS tube Q2 turns on.
When this circuit overvoltage, i.e. when this comparator 401 compares this over-voltage and over-current detecting module
The load voltage of 30 detectings is more than the reference voltage V of this reference voltage module 20 outputREFTime,
Produce the pressure limiting signal grid to PMOS Q1 of a high level, thus PMOS Q1
Cut-off, thus disconnect the connection between this power supply 90 and this load 80, it is therefore prevented that overvoltage is to negative
Carry the damage of 80.
When overcurrent, flow through the electric current of resistance R3 more than a predetermined value, so that this electricity
The voltage at resistance R3 two ends is higher than this predetermined value, and makes the voltage changed excessive so that should
NMOS tube Q3 turns on, thus, the base stage of this NPN audion Q4 NMOS by this conducting
Pipe Q3 is connected with node A and is in high potential, and this NPN audion Q4 turns on, this NMOS
The grid of the pipe Q2 NPN audion Q4 ground connection by this conducting, thus obtain a low level,
Then this NMOS tube Q2 cut-off, thus disconnect the connection between this power supply 90 and this load 80,
Prevented the damage flowed load 80.
Thus, the present invention when voltage is excessive, disconnects this connection by this overvoltage protection switch 50
Port 10 and the connection of load 80, thus deenergization 90 and the connection of load 80, this mistake
Stream protection switch 70 when electric current is excessive, the connection of deenergization 90 and load 80, thus anti-
The damage that only load 80 is caused by overcurrent-overvoltage.
Claims (11)
1. an over-voltage over-current protection circuit, including:
One connectivity port is powered to a load for accessing a power supply；
It is characterized in that, this over-voltage over-current protection circuit also includes:
One overvoltage protection switch, for the connection of this connectivity port of on or off Yu this load；
One overcurrent protective switch, for the connection of this connectivity port of on or off Yu this load；
One reference voltage module, for output one reference voltage level；
One over-voltage and over-current detecting module, between this overcurrent protective switch and ground, detects output in real time
Path current in path and output to the load voltage of load, this overcurrent protective switch include a resistance and
One high level conducting switch, this resistance and this high level conducting switch in parallel, this high level turns on switch and is somebody's turn to do
Overvoltage protection switch and this overcurrent-overvoltage detecting module connect；
One comparison module, opens with this reference voltage module, this over-voltage and over-current detecting module and this overvoltage protection
Guan Jun is connected, defeated for the load voltage and this reference voltage module comparing the output of this over-voltage and over-current detecting module
The reference voltage level gone out, when the load voltage of this over-voltage and over-current detecting module output is more than this reference voltage level,
Export a pressure limiting signal, control this overvoltage protection switch and disconnect the connection of this connectivity port and this load；When this
When the load voltage of over-voltage and over-current detecting module output is less than this reference voltage level, exports a stationary signal, lead
This connectivity port logical and the connection of this load；
One current control module, is all connected with this over-voltage and over-current detecting module and this overcurrent protective switch, uses
Control this overcurrent protective switch in the path current detected according to this over-voltage and over-current detecting module disconnect or turn on
This connectivity port and the connection of this load.
2. over-voltage over-current protection circuit as claimed in claim 1, it is characterised in that: this reference voltage module
Be a three terminal regulator, one first resistance and one second resistance, the reference pole of this three terminal regulator by this
One resistance is connected with this positive source and this comparison module, by this second resistance eutral grounding, this three terminal regulator
Negative electrode be connected with this positive source, the plus earth of this three terminal regulator, this reference voltage module output one
Reference voltage level is to this comparator.
3. over-voltage over-current protection circuit as claimed in claim 1, it is characterised in that: this over-voltage and over-current is detected
Module includes that one first resistance and one second resistance, this first resistance and this second resistance are serially connected with this and cross stream guarantor
Protecting between switch and ground, this second resistance is connected to ground, and in parallel with load, this over-voltage and over-current detecting module
Detection path current is the electric current flowing through this first resistance, and the load voltage of detecting is the voltage of the second resistance,
This over-voltage and over-current detecting module be respectively transmitted this load voltage and this path current to comparison module and this cross stream control
Molding block.
4. over-voltage over-current protection circuit as claimed in claim 1, it is characterised in that: this comparison module is one
Comparator, the normal phase input end of this comparator is connected with this over-voltage and over-current detecting module, the negative of this comparator
Input is connected with this reference voltage module, and the outfan of this comparator is connected with this voltage control module.
5. over-voltage over-current protection circuit as claimed in claim 4, it is characterised in that: when this over-voltage and over-current is detectd
During the reference voltage level that the load voltage of survey module output accesses more than this reference voltage module, this comparison module
The pressure limiting signal exporting a high level switchs to this voltage protection.
6. over-voltage over-current protection circuit as claimed in claim 4, it is characterised in that: when this over-voltage and over-current is detectd
During the reference voltage level that the load voltage of survey module output accesses less than this reference voltage module, this comparison module
Export a low level stationary signal to switch to this voltage protection.
7. over-voltage over-current protection circuit as claimed in claim 1, it is characterised in that: this voltage protection switchs
Including a low level conducting switch, this low level conducting switch is connected with this comparison module, load and power supply.
8. over-voltage over-current protection circuit as claimed in claim 7, it is characterised in that: when this comparison module is defeated
Go out pressure limiting signal to this voltage protection of a high level when switching, the conducting switch cut-off of this low level, disconnect electricity
Source and the connection of this load.
9. over-voltage over-current protection circuit as claimed in claim 1, it is characterised in that: this current control module
Including one first high level conducting switch and one second high level conducting switch, this first high level conducting switch
It is connected with this overcurrent protective switch, this overcurrent-overvoltage detecting module and this second high level conducting switch respectively,
This second high level conducting switch is connected with a low level conducting switch, this overvoltage protection switch and ground respectively.
10. over-voltage over-current protection circuit as claimed in claim 9, it is characterised in that: when this over-voltage and over-current is detectd
When the path current of survey module detecting is excessive, this first high level conducting switch conduction, this second high level is led
Logical switch conduction, this current control module exports a low level to this overcurrent protective switch.
11. over-voltage over-current protection circuits as claimed in claim 1, it is characterised in that: when this electricity flow control module
When block exports a low level to this high level conducting switch, the conducting switch cut-off of this high level, flow through this load
Voltage be zero.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110207257.0A CN102891466B (en) | 2011-07-22 | Over-voltage over-current protection circuit | |
| TW100126714A TWI515987B (en) | 2011-07-22 | 2011-07-28 | Overvoltage and overcurrent protection circuit |
| US13/207,431 US8472157B2 (en) | 2011-07-22 | 2011-08-11 | Overvoltage and overcurrent protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110207257.0A CN102891466B (en) | 2011-07-22 | Over-voltage over-current protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102891466A CN102891466A (en) | 2013-01-23 |
| CN102891466B true CN102891466B (en) | 2016-12-14 |
Family
ID=
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001136734A (en) * | 1999-11-08 | 2001-05-18 | Fdk Corp | Overcurrent protection circuit |
| CN1388618A (en) * | 2001-05-24 | 2003-01-01 | 台达电子工业股份有限公司 | Output Overvoltage Protection Device for Buck Converter |
| CN201113384Y (en) * | 2007-09-12 | 2008-09-10 | 青岛海信移动通信技术股份有限公司 | Electricized overvoltage protection circuit and mobile terminal possessing the circuit |
| CN102035191A (en) * | 2010-12-28 | 2011-04-27 | 广东易事特电源股份有限公司 | A kind of IGBT module over-temperature protection circuit |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001136734A (en) * | 1999-11-08 | 2001-05-18 | Fdk Corp | Overcurrent protection circuit |
| CN1388618A (en) * | 2001-05-24 | 2003-01-01 | 台达电子工业股份有限公司 | Output Overvoltage Protection Device for Buck Converter |
| CN201113384Y (en) * | 2007-09-12 | 2008-09-10 | 青岛海信移动通信技术股份有限公司 | Electricized overvoltage protection circuit and mobile terminal possessing the circuit |
| CN102035191A (en) * | 2010-12-28 | 2011-04-27 | 广东易事特电源股份有限公司 | A kind of IGBT module over-temperature protection circuit |
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