CN104078919B - Led lamp and its electronic circuit breaker - Google Patents
Led lamp and its electronic circuit breaker Download PDFInfo
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- CN104078919B CN104078919B CN201310102191.8A CN201310102191A CN104078919B CN 104078919 B CN104078919 B CN 104078919B CN 201310102191 A CN201310102191 A CN 201310102191A CN 104078919 B CN104078919 B CN 104078919B
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Abstract
The invention provides LED lamp and its electronic circuit breaker, electronic circuit breaker is connected in series between power input and LED lamp, including：One sampling resistor, one end of the sampling resistor couple the LED lamp；One field-effect transistor, the source electrode of the field-effect transistor couple the power input, and grid couples the other end of the sampling resistor；One current detecting chip, the current detecting chip include：One current sense amplifier and a voltage comparator, two detection pins of the current sense amplifier are respectively coupled to the both ends of the sampling resistor, the output pin of the current sense amplifier couples a LED current AD conversion port and is grounded by a resistance pressure-dividing network, and the locking output pin of the voltage comparator couples the drain electrode of the field-effect transistor；The present invention is limited the electric current in LED lamp, the connection of timely deenergization and load when excessively stream, and can detect LED real-time working electric current.
Description
Technical field
The present invention relates to electronic circuit breaker field, particularly LED lamp and its electronic circuit breaker.
Background technology
Traditional mechanical thermal circuit beraker far can not all be applied to protection LED in response time, accuracy etc..Therefore
The present invention devises a kind of electronic circuit breaker suitable for LED lamp, while this breaker and can provides LED electric current ginseng in real time
Number.
China Patent Publication No.：CN201726097U discloses a kind of with curent change detection and the open circuit of control function
Device.It is in insulation crust, current transformer, rectifier filter, MPU single-chip microcomputers, A.C. contactor, acoustic-optic alarm,
Opening amperage setting device, the breaking value setting device of electric current increase are connected.The breaking current and electricity of breaker can be set
Flow the size of value added.When the size of electric current in circuit and current increase exceedes the value of setting, circuit can be implemented disconnected
Road controls.
In view of this, LED lamp and its electronic circuit breaker are inventor provided.
The content of the invention
For in the prior art the defects of, of the invention provides LED lamp and its electronic circuit breaker, overcomes existing skill
The difficulty of art, the electric current in LED lamp is limited, the connection of timely deenergization and load when excessively stream, while and can
Detect LED real-time working electric current.
According to an aspect of the present invention, there is provided a kind of electronic circuit breaker suitable for LED lamp, be connected in series in power supply
Between input and LED lamp, including：One sampling resistor, one end of the sampling resistor couple the LED lamp；One effect
Transistor is answered, the source electrode of the field-effect transistor couples the power input, and grid couples the another of the sampling resistor
End；One current detecting chip, the current detecting chip include：One current sense amplifier and a voltage comparator, the electricity
Two detection pins of stream detection amplifier are respectively coupled to the both ends of the sampling resistor, the output of the current sense amplifier
Pin couples a LED current AD conversion port and is grounded by a resistance pressure-dividing network, and the locking of the voltage comparator is defeated
Go out the drain electrode that pin couples the field-effect transistor；When the current sense amplifier detects and amplifies the sampling resistor
After electric current, the voltage comparator is entered by the resistance pressure-dividing network, when the electric current of the sampling resistor exceedes preset value
When, the locking output pin of the voltage comparator is changed into high level from low level, and the field-effect transistor is ended.
Preferably, in addition to a triode, the colelctor electrode of the triode couple the drain electrode of the field-effect transistor,
The emitter stage of the triode couples the locking output pin of the voltage comparator, the base earth of the triode.
Preferably, connected between the locking output pin of the voltage comparator and the emitter stage of the triode one
Three resistance.
Preferably, it is grounded after one the 4th resistance of the base series of the triode.
Preferably, the triode is NPN transistor.
Preferably, the resistance pressure-dividing network includes two resistance, the output pin series connection of the current sense amplifier
The in-phase input end of the voltage comparator and one end of second resistance, the other end of second resistance are coupled after one first resistor
Ground connection.
Preferably, the reset switch of the ground connection of voltage comparator coupling one.
Preferably, the resistance of the sampling resistor is less than or equal to 1 ohm.
Preferably, the resistance of the sampling resistor is 0.1 ohm.
According to another aspect of the present invention, a kind of LED lamp for including above-mentioned electronic circuit breaker is additionally provided.
Documents in background technology（China Patent Publication No.：CN201726097U）Mainly pass through multiple integrated electricity
Road, single-chip microcomputer, carry out system are worked to realize, and the disconnection of power circuit is realized by contactor；And the application
It is then to realize the function by precision resister and classical current detecting chip, and is to realize power line by transistor
The disconnection on road.The application is compared with documents, and both embodiments are different, and chip used in this application is less, integrated level
Higher, the cost of realization is lower.
Compared with prior art, due to having used above technology, LED lamp of the invention and its electronic circuit breaker are to LED
Electric current on light fixture is limited, the connection of timely deenergization and load when excessively stream, while and can detection LED real-time work
Make electric current.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention,
Objects and advantages will become more apparent upon：
Fig. 1 shows that according to the specific embodiment of the present invention of the invention has electric current concurrently suitable for LED lamp
The circuit theory diagrams of the electronic circuit breaker of detection function；And
Fig. 2 shows that according to the specific embodiment of the present invention of the invention has electric current concurrently suitable for LED lamp
The circuit diagram of the electronic circuit breaker of detection function.
Reference
1 current detecting chip
101 current sense amplifiers
102 voltage comparators
2 sampling resistors
3 triodes
4 field-effect transistors 4
5 reset switches
6 LED drive modules
7 LED lamps
8 first resistors
9 second resistances
10 LED current AD conversion ports
11 3rd resistors
12 the 4th resistance
13 the 5th resistance
VINPower input
Embodiment
It will be appreciated by those skilled in the art that those skilled in the art, which combine prior art and above-described embodiment, can realize institute
Change case is stated, will not be described here.Such change case has no effect on the substantive content of the present invention, will not be described here.
Fig. 1 shows that according to the specific embodiment of the present invention of the invention has electric current concurrently suitable for LED lamp
The circuit theory diagrams of the electronic circuit breaker of detection function.As shown in figure 1, the invention provides a kind of suitable for the simultaneous of LED lamp
There is the electronic circuit breaker of current sense function, be connected in series in power input VINBetween LED lamp 7, including electric current inspection
Survey chip 1, a field-effect transistor 4, resistance pressure-dividing network and a sampling resistor 2.The source electrode coupling electricity of field-effect transistor 4
Source input VIN, one end of grid coupling sampling resistor 2, the other end coupling LED lamp 7 of sampling resistor 2.Current detecting chip
1 includes a current sense amplifier 101 and a voltage comparator 102, and two detections of current sense amplifier 101 are drawn
Pin is respectively coupled to the both ends of sampling resistor 2, and the output pin of current sense amplifier 101 couples electricity by a resistance pressure-dividing network
Press the in-phase input end of comparator 102, the drain electrode of the locking output pin coupling field-effect transistor 4 of voltage comparator 102.When
After current sense amplifier 101 detects and amplifies the electric current of sampling resistor 2, voltage comparator is entered by resistance pressure-dividing network
102, when the electric current of sampling resistor 2 exceedes preset value, the locking output pin of voltage comparator 102 is changed into high electricity from low level
Flat, field-effect transistor 4 is ended, so as to realize the function of electronic circuit breaker.Moreover, the output of current sense amplifier 101
Pin couples a LED current AD conversion port 10, and current sense function is realized so as to have concurrently.Resistance pressure-dividing network includes two electricity
Hinder, the homophase input of voltage comparator 102 is coupled after output pin one first resistor 8 of series connection of current sense amplifier 101
End, the in-phase input end of voltage comparator 102 are also coupled to the second resistance 9 of a ground connection.The ground connection of the coupling of voltage comparator 102 one
Reset switch 5.
In actual use, on the premise of ensureing that sampling output is unlikely to too small, the resistance of sampling resistor 2 is smaller, measurement
As a result it is more accurate.So the resistance of sampling resistor 2 is less than or equal to 1 ohm.Most preferably, the resistance of sampling resistor 2 is 0.1 Europe
Nurse.
Fig. 2 shows that according to the specific embodiment of the present invention of the invention has electric current concurrently suitable for LED lamp
The circuit diagram of the electronic circuit breaker of detection function.As shown in Fig. 2 in the present embodiment, the current detecting chip 1 used is examined for electric current
Survey comparable chip.
In the present embodiment, corresponding pin application relation is as follows in current detecting comparable chip：
RS+ pins and RS- pins in current detecting comparable chip draw for two detections of current sense amplifier 101
Pin, to the electric current of common detection sampling resistor 2.
COUT pins in current detecting comparable chip are the locking output pin of voltage comparator 102.
VCC pin in current detecting comparable chip is chip power supply pin, and VCC pin is connected by one the 5th resistance 13
Power input VIN.In another embodiment, VCC pin directly can also be grounded by a dc source.VCC pin
Operating voltage range be 2.7 to 28V.
RESET pins in current detecting comparable chip are the reset pin of voltage comparator 102.
OUT pins in current detecting comparable chip are the output pin of current sense amplifier 101.
CIN pins in current detecting comparable chip are the in-phase input end of voltage comparator 102.
In the present embodiment, it is assumed that drive module output is 28V DC, it is necessary to which the threshold set is 1A.Because electric current is examined
Survey COUT pins output highest in comparable chip and there was only 5V, so the electronic circuit breaker of the present invention, which also includes one, extends voltage
Triode 3, the drain electrode of the colelctor electrode coupling field-effect transistor 4 of triode 3, the emitter stage coupling voltage comparator of triode 3
102 locking output pin, the base earth of triode 3.The locking output pin of voltage comparator 102 and the hair of triode 3
One 3rd resistor 11 of series connection between emitter-base bandgap grading.It is grounded after one the 4th resistance 12 of base series of triode 3.It is simultaneously as electric
The input threshold of CIN pins is 600mV in stream detection comparable chip, and electric current door can be voluntarily set by resistance pressure-dividing network
Limit.
The operation logic of the electronic circuit breaker for having current sense function concurrently suitable for LED lamp in the present embodiment is such as
Under：
Fig. 1 and Fig. 2 are please also refer to, current sense amplifier 101 and voltage ratio are contained in current detecting comparable chip
Compared with device 102.The resistance of first resistor 8 is 27 kilo-ohms.The resistance of second resistance 9 is 12 kilo-ohms.The resistance of 3rd resistor 11 is 10
Kilo-ohm.The resistance of 4th resistance 12 is 100 kilo-ohms.Triode 3 is NPN type triode.
The present invention uses a current detecting chip to build circuit for core.External circuit is dexterously designed, realizes detection
LED current and the function of overcurrent protection, equivalent to one electronic circuit breaker.In order to detect that the drive module being likely to occur is different
Often, circuit module must be connected between driving and light fixture.101 external high-precision sampling resistors 2 of current sense amplifier,
Sampling resistor 2 is connected with LED lamp 7, then the electric current for flowing through sampling resistor 2 is identical with LED current.Pass through external sampling resistance 2
LED current is sampled, by the computing of chip internal, judges whether LED current exceeds more afterwards with internal reference voltage ratio
Threshold.If being above threshold, chip exports a high level, now by outer by a locking output pin
The field-effect transistor 4 in portion, you can disconnect power circuit, protection LED lamp 7 is without prejudice., can after inspection makes mistake
To reset electronic circuit breaker, light fixture is set to recover normal work.
The effect of sampling resistor 2 is as follows：Current detecting chip needs an external sampling resistor 2, is connected on RS+ and RS- draws
Between pin.Sampling resistor 2 must be high-precision, to ensure the precision of sampling.In addition, resistance should be as low as possible, because
Current supply circuit is directly connected on for it, resistance crosses conference and produces very big power consumption, and the excessive resistance of power consumption can generate heat so that resistance is produced
Raw large change.Resistance is typically below 1 Europe, herein from 0.1 Europe.
Current detecting exports：Chip has the one tens times gains for arriving hundreds of times, Ran Hou to the pressure drop on sampling resistor 2
OUT pins export.Its calculation formula is as follows：
ILED=VOUT/(Gain·RSENSE)
Wherein, VOUTFor the output voltage values of OUT pins, Gain is chip gain factor, and the gain that we select herein is
20 volts/volt, RSENSETo examine the resistance of leakage resistance, ILEDFor the current value in LED lamp 7, i.e. current value on sampling resistor 2.Institute
To work as ILEDReach the limit of the ampere-hour of value 1, VOUTFor
VOUT=ILED·Gain·RSENSE=2V
Meanwhile OUT pins can connect AD conversion port, there is provided LED real-time current, can monitor LED working condition.
The setting of threshold：The reference voltage of voltage comparator 102 in the present embodiment is 600 millivolts, by voltage ratio
Compared with the internal circuit in device 102 as standard source, then the input threshold of chip CIN pins is 600 millivolts, by OUT and CIN
First resistor 8, second resistance 9 form potential-divider network, threshold can be voluntarily set according to being actually needed.The present embodiment
In, potential-divider network meets that resistance=2.3 of resistance/second resistance 9 of first resistor 8 can make threshold for 1 peace, herein
First resistor 8, second resistance 9 are respectively 27 kilo-ohms, 12 kilo-ohms.
The extension of breaking control voltage scope：According to chip-count according to data, COUT output highest only has 5 volts, and
It is not suitable for the circuit of 28 volts of power supplies.So the present invention uses a general NPN transistor, voltage range is expanded to 28
Volt.
Open circuit control：When electric current exceedes thresholding, COUT pins can be changed into high level from low level, can allow COUT
One field-effect transistor 4 of control is so as to the on and off of control circuit.When circuit is working properly, COUT outputs are low level,
NPN is turned on, and field-effect transistor 4 is also with conducting.And when electric current exceedes thresholding, COUT output high level（And always
Maintain high level）, NPN cut-offs, field-effect transistor 4 is truncated also with cut-off, supply line, and LED lamp 7 is protected.
The replacement of breaker：If line fault excludes, it can reset breaker with low level triggering RESET pins,
COUT exports low level, line conduction again.
Certainly, current sense amplifier and electricity are carried by what the current detecting comparable chip in the present invention was changed to other models
Press the chip of comparator and/or increase and decrease the protection that the transformations such as resistance, adjustment resistance all fall within the present invention in the circuit of the present invention
Within the scope of.
In summary, LED lamp of the invention and its electronic circuit breaker are limited the electric current in LED lamp, have been served as
The connection of timely deenergization and load during stream, while and can detection LED real-time working electric current.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (7)
1. a kind of electronic circuit breaker suitable for LED lamp, it is connected in series in power input (VIN) between LED lamp (7),
It is characterized in that including：
One sampling resistor (2), one end of the sampling resistor (2) couple the LED lamp (7)；
One field-effect transistor (4), the source electrode of the field-effect transistor (4) couple the power input (VIN), drain coupling
Connect the other end of the sampling resistor (2)；
One current detecting chip (1), the current detecting chip (1) include：One current sense amplifier (101) and a voltage ratio
Compared with device (102), two detection pins of the current sense amplifier (101) are respectively coupled to the both ends of the sampling resistor (2),
The output pin of the current sense amplifier (101) couples a LED current AD conversion port (10) and by a resistance point
Grid grounding is pressed, the locking output pin of the voltage comparator (102) couples the grid of the field-effect transistor (4)；
After the current sense amplifier (101) detects and amplifies the electric current of the sampling resistor (2), pass through the resistance point
Pressure network network enters the voltage comparator (102), when the electric current of the sampling resistor (2) exceedes preset value, the voltage ratio
Locking output pin compared with device (102) is changed into high level from low level, and the field-effect transistor (4) is ended；
Also include：One triode (3), the colelctor electrode of the triode (3) couple the grid of the field-effect transistor (4),
The emitter stage of the triode (3) couples the locking output pin of the voltage comparator (102), the base of the triode (3)
Pole is grounded；
Connected one the 3rd between the locking output pin of the voltage comparator (102) and the emitter stage of the triode (3)
Resistance (12)；
One the 4th resistance (11) of base series of the triode (3) is grounded afterwards.
2. electronic circuit breaker as claimed in claim 1, it is characterised in that：The triode (3) is NPN transistor.
3. electronic circuit breaker as claimed in claim 1, it is characterised in that：The resistance pressure-dividing network includes two resistance, institute
Output pin one first resistor (8) of series connection for stating current sense amplifier (101) couples the voltage comparator (102) afterwards
One end of in-phase input end and second resistance (9), the other end ground connection of second resistance (9).
4. electronic circuit breaker as claimed in claim 1, it is characterised in that：The ground connection of voltage comparator (102) coupling one
Reset switch (5).
5. electronic circuit breaker as claimed in claim 1, it is characterised in that：The resistance of the sampling resistor (2) is less than or equal to 1 Europe
Nurse.
6. electronic circuit breaker as claimed in claim 5, it is characterised in that：The resistance of the sampling resistor (2) is 0.1 ohm.
A kind of 7. LED lamp of the electronic circuit breaker including any one of claim 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310102191.8A CN104078919B (en) | 2013-03-27 | 2013-03-27 | Led lamp and its electronic circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310102191.8A CN104078919B (en) | 2013-03-27 | 2013-03-27 | Led lamp and its electronic circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104078919A CN104078919A (en) | 2014-10-01 |
| CN104078919B true CN104078919B (en) | 2018-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310102191.8A Active CN104078919B (en) | 2013-03-27 | 2013-03-27 | Led lamp and its electronic circuit breaker |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375549B (en) * | 2014-10-30 | 2016-08-31 | 中国电子科技集团公司第三十六研究所 | A kind of anti-latch circuit of cmos device |
| CN106571616B (en) * | 2015-10-10 | 2019-11-29 | 中兴通讯股份有限公司 | Power supply suspend mode and wake-up circuit |
| CN106451341B (en) * | 2016-11-22 | 2019-07-19 | 亿嘉和科技股份有限公司 | Load over-current protection circuit and load overcurrent guard method |
| CN106505528B (en) * | 2017-01-05 | 2018-11-30 | 科蒂斯技术（苏州）有限公司 | A kind of flash driving current foldback circuit realized using discrete component |
| CN108320691A (en) * | 2018-03-27 | 2018-07-24 | 苏州佳智彩光电科技有限公司 | A kind of over-current over-voltage protection method and system when the test for OLED screen |
| DE102018219692A1 (en) * | 2018-11-16 | 2020-05-20 | Siemens Aktiengesellschaft | Protective switching device for a low-voltage circuit for the detection of serial arcing faults |
| KR102099355B1 (en) | 2018-11-26 | 2020-04-10 | 현대오트론 주식회사 | Integrated circuit test apparatus |
| CN109638782A (en) * | 2018-12-07 | 2019-04-16 | 航天科工智能机器人有限责任公司 | Quick overcurrent monitoring protects circuit |
| CN114977086A (en) * | 2022-06-25 | 2022-08-30 | 清智汽车科技(苏州)有限公司 | High-side driving overcurrent protection circuit without sampling resistor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10336886A (en) * | 1997-05-26 | 1998-12-18 | Nippon Soken Inc | Device for breaking overcurrent in wiring system of vehicle |
| CN201167242Y (en) * | 2008-02-20 | 2008-12-17 | 比亚迪股份有限公司 | Automobile charger |
| CN102938797A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Current detection and control device for mobile terminal |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101153617B1 (en) * | 2010-07-19 | 2012-06-18 | 삼성전기주식회사 | Apparatus for driving emitting device with over-current and over-voltage protection |
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2013
- 2013-03-27 CN CN201310102191.8A patent/CN104078919B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10336886A (en) * | 1997-05-26 | 1998-12-18 | Nippon Soken Inc | Device for breaking overcurrent in wiring system of vehicle |
| CN201167242Y (en) * | 2008-02-20 | 2008-12-17 | 比亚迪股份有限公司 | Automobile charger |
| CN102938797A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Current detection and control device for mobile terminal |
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| Publication number | Publication date |
|---|---|
| CN104078919A (en) | 2014-10-01 |
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