CN205565674U - Current foldback circuit , drive circuit and electric installation - Google Patents
Current foldback circuit , drive circuit and electric installation Download PDFInfo
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- CN205565674U CN205565674U CN201620372003.2U CN201620372003U CN205565674U CN 205565674 U CN205565674 U CN 205565674U CN 201620372003 U CN201620372003 U CN 201620372003U CN 205565674 U CN205565674 U CN 205565674U
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- outfan
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Abstract
The utility model provides a current foldback circuit, drive circuit and electric installation, current foldback circuit and quilt protection circuit connection, include the switch tube by the protection circuit, wherein the input termination of switch tube is in on the high potential node of protection circuit, the output termination of switch tube is in on the low potential node of protection circuit, current foldback circuit includes microcontroller, over -current protection unit, first resistance and second resistance, the first termination of first resistance microcontroller's output, the second termination of first resistance the control end of switch tube, so, can make the protection when the power switch device electric current appears and overflows, close and close the border the device and latch this guard mode, prevent to close the device and appear overflowing in succession assaulting and leading to the fact many times and close the device and latch -up and shortened life expectancy appear, its circuit is simple reliable, and is with low costs.
Description
Technical field
This utility model relates to electricity protection field, particularly relates to a kind of current foldback circuit, drive circuit
And electricity equipment.
Background technology
In the current foldback circuit application of current power device, the electric current being generally used for detecting on bus is sentenced
Disconnected whether mistake is flowed, and when bus current crosses stream, switching tube can output signal be closed by protection circuit, works as switch
The electric current of pipe can stop output protection signal less than protection circuit during protection value, and switching tube may proceed to turn on even
Overcurrent again occur, such switching tube occurs that the most continuous stream of crossing impacts and causes switching tube breech lock occur
Effect and the lost of life.
Utility model content
This utility model purpose is to provide a kind of current foldback circuit, it is intended to solve to open in current foldback circuit
Close the problem that latch-up and the lost of life occurs in pipe.
This utility model provides a kind of current foldback circuit, is connected with by protection circuit, described by protection electricity
It is described by the high potential node of protection circuit that road includes that switching tube, the input of wherein said switching tube are connected on,
The outfan of described switching tube is connected on described by the low potential node of protection circuit,
Described current foldback circuit includes microcontroller, over-current protecting unit, the first resistance and the second resistance,
The outfan of the first described microcontroller of termination of described first resistance, the second termination institute of described first resistance
State the control end of switching tube；
Described over-current protecting unit includes:
It is connected on described by the low potential node of protection circuit, and by the input of described second resistance eutral grounding；
Connecing the second end of described first resistance, for when described switching tube crosses stream, output control level controls
Described switching tube close, and latch until described microcontroller outfan reset outfan；
Connecing the input of described microcontroller, the outfan making described microcontroller for output protection level is multiple
The protection signal output part of position；
Connect the outfan of described microcontroller, make the outfan of described over-current protecting unit stop for receiving signal
Only export the reset terminal of described control level.Specifically, described over-current protecting unit include comparing unit,
Three resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the first diode, the two or two pole
Pipe and the 3rd diode, wherein:
The normal phase input end of described comparing unit connects working power by described 3rd resistance, and by the 4th electricity
Resistance ground connection；The anti-phase input of described comparing unit terminates the first end of described 5th resistance and described 6th resistance
The first end, the second end of described 5th resistance as described over-current protecting unit input terminate described switch
The outfan of pipe, the second end of described 6th resistance terminates described micro-as the reset of described over-current protecting unit
The outfan of controller, described 7th resistance one terminates described working power, the 3rd diode described in the other end
Anode；
The negative electrode of described first diode, the second diode and the 3rd diode all defeated with described comparing unit
Going out end to connect, the anode of described first diode connects the normal phase input end of described comparing unit, and the described 2nd 2
Pole pipe as described in over-current protecting unit output terminate described first resistance the second end, the described 3rd 2
The anode of pole pipe connects the input of described microcontroller as the signal output part of protecting of described over-current protecting unit
End.
Preferably, described comparing unit is comparator.
Further, described switching tube is audion, metal-oxide-semiconductor or IGBT pipe.
Further, described microcontroller is NE555 chip.
This utility model additionally provides a kind of drive circuit, is connected with load, including above-mentioned overcurrent protection electricity
Road, described drive circuit also includes:
Inducer, a termination positive source, another input terminating described switching tube and rectification two pole
The anode of pipe；The negative electrode of described commutation diode connects the positive input terminal of described load；
The input of described switching tube connects power cathode by described second resistance.
Further, described drive circuit also includes commutator, two input termination exchanges of described commutator
Power supply, positive output end and negative output terminal are respectively as described positive source and power cathode.
This utility model additionally provides a kind of electricity equipment, including above-mentioned drive circuit.
Above-mentioned current foldback circuit when the overcurrent flow through on described switching tube, over-current protecting unit
The output control level described switching tube of control is closed and is latched by outfan, and output protection level is to described micro-
Controller makes the outfan of microcontroller reset, the driving signal of microcontroller output switch pipe again after reset
Reset terminal to over-current protecting unit makes the outfan of over-current protecting unit stop exporting described control level, as
This, can make protection when overcurrent occurs in IGBT constant power switching device, closes IGBT and latch
This guard mode, prevented IGBT occur the most continuous cross stream impact and cause IGBT occur latch-up and
The lost of life, its circuit is simple and reliable, low cost.
Accompanying drawing explanation
Fig. 1 is the module diagram of current foldback circuit in this utility model preferred embodiment；
Fig. 2 is the circuit theory diagrams that current foldback circuit shown in Fig. 1 is applied to drive circuit.
Detailed description of the invention
In order to make the technical problems to be solved in the utility model, technical scheme and beneficial effect clearer,
Below in conjunction with drawings and Examples, this utility model is further elaborated.Should be appreciated that herein
Described specific embodiment, only in order to explain this utility model, is not used to limit this utility model.
Refer to Fig. 1 and Fig. 2, in this utility model preferred embodiment current foldback circuit 100 with protected
Circuit 200 connects, and described is included switching tube 201 by protection circuit 200, wherein said switching tube 201
Input is connected on described by the high potential node A of protection circuit 200, the outfan of described switching tube 201
It is connected on described by the low potential node B of protection circuit 200.
Described current foldback circuit 100 includes microcontroller 110, over-current protecting unit the 120, first resistance
The outfan of the first described microcontroller 110 of termination of R1 and the second resistance R2, described first resistance R1,
The control end of the second described switching tube 201 of termination of described first resistance R1, the output of microcontroller 110
End drives signal Vigbt to control switching tube 201 opening and closing for output switch pipe.
Described over-current protecting unit 120 includes: input 121, outfan 122, protection signal output part
123 and reset terminal 124.
Input 121 is connected on described by the low potential node B of protection circuit 200, and by described second electricity
Resistance R2 ground connection, for accessing the electric current I flowing through described switching tube 201；Outfan 122 connects described first
Second end of resistance R1, for when described switching tube 201 crosses stream, opens described in output control level control
Close pipe 201 to close, and latch until the outfan of described microcontroller 110 resets；Protection signal output part
123 inputs connecing described microcontroller 110, make described microcontroller 110 for output protection level
Outfan resets；Reset terminal 124 connects the outfan of described microcontroller 110, is used for receiving switching tube and drives
Signal Vigbt makes the outfan of described over-current protecting unit 120 stop exporting described control level.
Further, current foldback circuit 100 can also include switch drive module 150, switch drive mould
The input of block 150 terminates second end of described first resistance R1, the output termination of switch drive module 150
The control end of described switching tube 201.
Specifically, described over-current protecting unit 120 includes comparing unit IC1, the 3rd resistance R3, the 4th electricity
Resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7, the first diode D1, the two or two pole
Pipe D2 and the 3rd diode D3.
The normal phase input end of described comparing unit IC1 connects working power VCC by described 3rd resistance R3,
And by the 4th resistance R4 ground connection；The anti-phase input of described comparing unit IC1 terminates described 5th resistance R5
The first end and first end of described 6th resistance R6, second end of described 5th resistance R5 is as described mistake
The input 121 of stream protected location 120 meets the outfan of described switching tube 201, described 6th resistance R6
The second end connect the output of described microcontroller 110 as the reset terminal 124 of described over-current protecting unit 120
End, described 7th resistance R7 mono-terminates described working power VCC, the 3rd diode D3 described in the other end
Anode.
Described first diode D1, the second diode D2 and the 3rd diode D3 negative electrode all with described ratio
The outfan of relatively unit IC1 connects, and the anode of described first diode D1 connects described comparing unit IC1's
Normal phase input end, described second diode D2 as described in the outfan 123 of over-current protecting unit 120
Connecing second end of described first resistance R1, the anode of described 3rd diode D3 is as described overcurrent protection list
The protection signal output part 122 of unit 120 connects the input of described microcontroller 110.
Preferably, described comparing unit IC1 is comparator.Described switching tube 201 is audion, metal-oxide-semiconductor
Or IGBT pipe, as a example by IGBT, the control end of switching tube 201, input, outfan are respectively IGBT
Gate pole, colelctor electrode, emitter stage.Described microcontroller 110 is NE555 chip, and input is chip
Reseting port, outfan is the output port of chip.
The operation principle of current foldback circuit 100 is:
When normally working: switching tube drives signal Vigbt to drive module 150 to control switching tube by switching tube
When 201, when the electric current I of switching tube 201 do not reach protection value, i.e. comparator anti-phase input terminal voltage Vi-<
Normal phase input end voltage Vi+,
Vi+=VCC*R4/ (R3+R4) ... ... ... ... ... (1)
Vi-=(VCC-R2*I) * R5/ (R5+R6)+R2*I ... ... ... (2)
Comparator output high level, the first diode D1 cut-off, the second diode D2 cut-off, the three or two pole
Pipe D3 ends, and current foldback circuit 100 is operated in normal condition；
When being operated in protection and latch: when microcontroller 110 outfan is that high level makes switching tube drive electricity
The input on road 150 and outfan are high level and switching tube 201 turns on；
When being reached protection value by the electric current of formula (1), (2) proper switching tube 201 (Vi-> Vi+),
Comparator output low level, it is low level that the first diode D1 conducting makes Vi+, (2) formula obtain
As long as now switching tube 201 electric current I >=0, Vi-is necessarily latched in low more than Vi+, i.e. comparator output terminal
Level；
Second diode D2 conducting makes the outfan 124 of over-current protecting unit 120 be low level so that open
Close pipe driving module 150 outfan output low level closing switch pipe 201 thus protect switching tube 201 not to be subject to
Overcurrent and damage；
3rd diode D3 conducting makes the protection signal output part 123 of over-current protecting unit 120 be low level,
There is switching tube overcurrent in notice microcontroller 110.
Reset: close after switching tube 201 is controlled by over-current protecting unit 120 overcurrent protection, switching tube
The electric current I of 201 is 0；And after microcontroller 110 receives the overcurrent protection signal of over-current protecting unit 120
Outfan output low level, at this moment Vi-is 0, owing to the first diode D1 conducting exists conduction voltage drop, institute
With Vi+ > Vi-, comparator output terminal output high level, then the first diode D1 cut-off, Vi+ becomes VCC* again
R4/(R3+R4)；Second diode D2 cut-off, over-current protecting unit 120 outfan 124 becomes high
Resistance state；3rd diode D3 conducting, the protection signal output part 122 of over-current protecting unit 120 is high
Level, such over-current protecting unit 120 resets and normally works.Also normal work is recovered by protection circuit 200.
In the application, above-mentioned is BUCK circuit, in other embodiments, quilt by protection circuit 200
Protection circuit can be Boost circuit.
Additionally, incorporated by reference to Fig. 1 and Fig. 2, additionally provide a kind of drive circuit 300, be connected with load 400,
Drive circuit 300 includes current foldback circuit 100 and inducer L1.Inducer L1 mono-terminates positive source
V+, another input terminating described switching tube 201 and the anode of a commutation diode D4；Described whole
The negative electrode of stream diode D4 connects the positive input terminal of described load 400；The input of described switching tube 201 leads to
Cross described second resistance R2 and meet power cathode V-.
Further, described drive circuit 300 also includes commutator 202, two of described commutator 202
Input termination alternating current power supply, positive output end and negative output terminal are respectively as described positive source V+ and power cathode
V-.Drive circuit 300 is the booster driving circuit comprising current foldback circuit 100.
This utility model additionally provides a kind of electricity equipment, including above-mentioned drive circuit 300.
In above-mentioned embodiment, when the overcurrent flow through on described switching tube 201, overcurrent protection list
The output control level described switching tube 201 of control is closed and is latched by the outfan of unit 120, and output protection
Level makes the outfan of microcontroller 110 reset to described microcontroller 110, microcontroller 110 after reset
Again the driving signal Vigbt of output switch pipe 201 made stream protect to the reset terminal of over-current protecting unit 120
The outfan protecting unit 120 stops exporting described control level, so, at switching tube constant power switching device
Occur to make protection during overcurrent, closing switch pipe and latch this guard mode, prevent switching tube from occurring
The most continuous stream of crossing impacts and causes switching tube latch-up and the lost of life occur, and its circuit is simple and reliable,
Low cost.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model,
All any amendment, equivalent and improvement etc. made within spirit of the present utility model and principle, all should
Within being included in protection domain of the present utility model.
Claims (8)
1. a current foldback circuit, is connected with by protection circuit, described is included switching tube by protection circuit,
The input of wherein said switching tube is connected on described by the high potential node of protection circuit, described switching tube
Outfan is connected on described by the low potential node of protection circuit, it is characterised in that；
Described current foldback circuit includes microcontroller, over-current protecting unit, the first resistance and the second resistance,
The outfan of the first described microcontroller of termination of described first resistance, the second termination institute of described first resistance
State the control end of switching tube；
Described over-current protecting unit includes:
It is connected on described by the low potential node of protection circuit, and by the input of described second resistance eutral grounding；
Connecing the second end of described first resistance, for when described switching tube crosses stream, output control level controls
Described switching tube close, and latch until described microcontroller outfan reset outfan；
Connecing the input of described microcontroller, the outfan making described microcontroller for output protection level is multiple
The protection signal output part of position；
Connect the outfan of described microcontroller, make the outfan of described over-current protecting unit stop for receiving signal
Only export the reset terminal of described control level.
2. current foldback circuit as claimed in claim 1, it is characterised in that described over-current protecting unit bag
Include comparing unit, the 3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance, the one or two
Pole pipe, the second diode and the 3rd diode, wherein:
The normal phase input end of described comparing unit connects working power by described 3rd resistance, and by the 4th electricity
Resistance ground connection；The anti-phase input of described comparing unit terminates the first end of described 5th resistance and described 6th resistance
The first end, the second end of described 5th resistance as described over-current protecting unit input terminate described switch
The outfan of pipe, the second end of described 6th resistance terminates described micro-as the reset of described over-current protecting unit
The outfan of controller；Described 7th resistance one terminates described working power, the 3rd diode described in the other end
Anode；
The negative electrode of described first diode, the second diode and the 3rd diode all defeated with described comparing unit
Going out end to connect, the anode of described first diode connects the normal phase input end of described comparing unit, and the described 2nd 2
Pole pipe as described in over-current protecting unit output terminate described first resistance the second end, the described 3rd 2
The anode of pole pipe connects the input of described microcontroller as the signal output part of protecting of described over-current protecting unit
End.
3. current foldback circuit as claimed in claim 2, it is characterised in that described comparing unit is for comparing
Device.
4. current foldback circuit as claimed in claim 1, it is characterised in that described switching tube be audion,
Metal-oxide-semiconductor or IGBT pipe.
5. current foldback circuit as claimed in claim 1, it is characterised in that described microcontroller is NE555
Chip.
6. a drive circuit, is connected with load, it is characterised in that include any one of claim 1 to 5
Described current foldback circuit, described drive circuit also includes:
Inducer, a termination positive source, another input terminating described switching tube and rectification two pole
The anode of pipe；The negative electrode of described commutation diode connects the positive input terminal of described load；The input of described switching tube
End connects power cathode by described second resistance.
7. drive circuit as claimed in claim 6, it is characterised in that described drive circuit also includes rectification
Device, two input termination alternating current power supplys of described commutator, positive output end and negative output terminal are respectively as described
Positive source and power cathode.
8. an electric equipment, it is characterised in that include the drive circuit described in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620372003.2U CN205565674U (en) | 2016-04-28 | 2016-04-28 | Current foldback circuit , drive circuit and electric installation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620372003.2U CN205565674U (en) | 2016-04-28 | 2016-04-28 | Current foldback circuit , drive circuit and electric installation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205565674U true CN205565674U (en) | 2016-09-07 |
Family
ID=56805182
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620372003.2U Active CN205565674U (en) | 2016-04-28 | 2016-04-28 | Current foldback circuit , drive circuit and electric installation |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410761A (en) * | 2016-11-15 | 2017-02-15 | 芜湖美智空调设备有限公司 | Overcurrent protection circuit, control method and air conditioner of intelligent power module |
| CN108923386A (en) * | 2018-08-24 | 2018-11-30 | 奥克斯空调股份有限公司 | A kind of over current protecting self-locking circuit and air conditioner |
| CN109787596A (en) * | 2018-12-25 | 2019-05-21 | 深圳市优必选科技有限公司 | Overcurrent protection circuit, switching tube drive circuit and electric equipment |
| CN113422350A (en) * | 2021-06-30 | 2021-09-21 | 佛山市顺德区美的电子科技有限公司 | Overcurrent protection circuit and air conditioning equipment |
-
2016
- 2016-04-28 CN CN201620372003.2U patent/CN205565674U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106410761A (en) * | 2016-11-15 | 2017-02-15 | 芜湖美智空调设备有限公司 | Overcurrent protection circuit, control method and air conditioner of intelligent power module |
| CN106410761B (en) * | 2016-11-15 | 2019-10-29 | 芜湖美智空调设备有限公司 | Current foldback circuit, control method and the air conditioner of intelligent power module |
| CN108923386A (en) * | 2018-08-24 | 2018-11-30 | 奥克斯空调股份有限公司 | A kind of over current protecting self-locking circuit and air conditioner |
| CN108923386B (en) * | 2018-08-24 | 2019-10-11 | 奥克斯空调股份有限公司 | A kind of over current protecting self-locking circuit and air conditioner |
| CN109787596A (en) * | 2018-12-25 | 2019-05-21 | 深圳市优必选科技有限公司 | Overcurrent protection circuit, switching tube drive circuit and electric equipment |
| CN109787596B (en) * | 2018-12-25 | 2023-08-04 | 深圳市优必选科技有限公司 | Overcurrent protection circuit, switching tube driving circuit and electric equipment |
| CN113422350A (en) * | 2021-06-30 | 2021-09-21 | 佛山市顺德区美的电子科技有限公司 | Overcurrent protection circuit and air conditioning equipment |
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| GR01 | Patent grant |