CN104078919A - LED (Light-Emitting Diode) lamp and electronic breaker thereof - Google Patents
LED (Light-Emitting Diode) lamp and electronic breaker thereof Download PDFInfo
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- CN104078919A CN104078919A CN201310102191.8A CN201310102191A CN104078919A CN 104078919 A CN104078919 A CN 104078919A CN 201310102191 A CN201310102191 A CN 201310102191A CN 104078919 A CN104078919 A CN 104078919A
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Abstract
The invention provides an LED (Light-Emitting Diode) lamp and an electronic breaker thereof. The electronic breaker is connected in series between a power supply input end and the LED lamp, and comprises a sampling resistor, a field effect transistor and a current detection chip, wherein one end of the sampling resistor is coupled with the LED lamp; a source electrode of the field effect transistor is coupled with the power supply input end; a grid electrode of the field effect transistor is coupled with the other end of the sampling resistor; the current detection chip comprises a current detection amplifier and a voltage comparator; two detection pins of the current detection amplifier are coupled with the two ends of the sampling resistor respectively; an output pin of the current detection amplifier is coupled with an LED alternating-direct (AD) current conversion port, and earthed by a resistance voltage-dividing network; and a locking output pin of the voltage comparator is coupled with a drain electrode of the field effect transistor. The electronic breaker limits current on the LED lamp, timely disconnects a power supply and a load in case of overcurrent, and can detect real-time working current of an LED.
Description
Technical field
The present invention relates to electronic circuit breaker field, particularly LED light fixture and electronic circuit breaker thereof.
Background technology
Traditional mechanical type thermal circuit beraker all can not be applicable to protect LED far away at aspects such as response time, accuracy.Therefore the present invention has designed a kind of electronic circuit breaker of the LED of being applicable to light fixture, this circuit breaker can provide the current parameters of LED again in real time simultaneously.
China Patent Publication No.: CN201726097U discloses a kind of circuit breaker that curent change detected and controlled function that has.It is in insulation crust, and current transformer, rectifier filter, MPU single-chip microcomputer, A.C. contactor, acoustic-optic alarm, opening amperage setting device, the electric current increase value setting device that opens circuit is connected.Can set the breaking current of circuit breaker and the size of electric current added value.When the size of electric current and electric current added value surpasses the value of setting in circuit, can implement to open circuit control to circuit.
In view of this, inventor provides LED light fixture and electronic circuit breaker thereof.
Documents in background technology (China Patent Publication No.: be CN201726097U) mainly by a plurality of integrated circuits, single-chip microcomputer, carry out that system works realizes, and realize the disconnection of power circuit by contactor; The application realizes this function by precision resister and classical current detecting chip, and is by transistor the disconnection that realizes power circuit.The application compares with documents, and both execution modes are different, and still less, integrated level is higher for chip used in this application, and the cost of realization is lower.
Compared with prior art, owing to having used above technology, LED light fixture of the present invention and electronic circuit breaker thereof limit the electric current on LED light fixture, the connection of timely deenergization and load when overcurrent, and the while can be detected again the real-time working electric current of LED.
Summary of the invention
For defect of the prior art, LED light fixture and the electronic circuit breaker thereof of providing of the present invention, has overcome the difficulty of prior art, and the electric current on LED light fixture is limited, the connection of timely deenergization and load when overcurrent, the while can be detected again the real-time working electric current of LED.
According to an aspect of the present invention, provide a kind of electronic circuit breaker of the LED of being applicable to light fixture, be connected in series between power input and LED light fixture, comprising: a sampling resistor, one end of described sampling resistor couples described LED light fixture; One field-effect transistor, the source electrode of described field-effect transistor couples described power input, and grid couples the other end of described sampling resistor; One current detecting chip, described current detecting chip comprises: a current sense amplifier and a voltage comparator, two of described current sense amplifier are detected the two ends that pin couples respectively described sampling resistor, the output pin of described current sense amplifier couples a LED electric current AD conversion port and by a resistance pressure-dividing network ground connection, the locking output pin of described voltage comparator couples the drain electrode of described field-effect transistor; When described current sense amplifier detects and amplifies after the electric current of described sampling resistor, by described resistance pressure-dividing network, enter described voltage comparator, when the electric current of described sampling resistor surpasses preset value, the locking output pin of described voltage comparator becomes high level from low level, and described field-effect transistor is cut off.
Preferably, also comprise a triode, the collector electrode of described triode couples the drain electrode of described field-effect transistor, and the emitter of described triode couples the locking output pin of described voltage comparator, the base earth of described triode.
Preferably, the 3rd resistance of connecting between the locking output pin of described voltage comparator and the emitter of described triode.
Preferably, ground connection after the 4th resistance of the base stage of described triode series connection.
Preferably, described triode is NPN transistor.
Preferably, described resistance pressure-dividing network comprises two resistance, couples one end of in-phase input end and second resistance of described voltage comparator, the other end ground connection of the second resistance after first resistance of output pin series connection of described current sense amplifier.
Preferably, described voltage comparator couples the reset switch of a ground connection.
Preferably, the resistance of described sampling resistor is less than or equal to 1 ohm.
Preferably, the resistance of described sampling resistor is 0.1 ohm.
According to another aspect of the present invention, also provide a kind of LED light fixture that comprises above-mentioned electronic circuit breaker.
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 illustrates according to a specific embodiment of the present invention, the circuit theory diagrams of the electronic circuit breaker that has current sense function concurrently of the LED of being applicable to light fixture of the present invention; And
Fig. 2 illustrates according to a specific embodiment of the present invention, the circuit diagram of the electronic circuit breaker that has current sense function concurrently of the LED of being applicable to light fixture of the present invention.
Reference numeral
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 driver modules
7 LED light fixtures
8 first resistance
9 second resistance
10 LED electric current AD conversion ports
11 the 3rd resistance
12 the 4th resistance
13 the 5th resistance
V
iNpower input
Embodiment
It will be appreciated by those skilled in the art that those skilled in the art can realize described variation example in conjunction with prior art and above-described embodiment, do not repeat them here.Such variation example does not affect flesh and blood of the present invention, does not repeat them here.
Fig. 1 illustrates according to a specific embodiment of the present invention, the circuit theory diagrams of the electronic circuit breaker that has current sense function concurrently of the LED of being applicable to light fixture of the present invention.As shown in Figure 1, the invention provides a kind of electronic circuit breaker that has current sense function concurrently of the LED of being applicable to light fixture, be connected in series in power input V
iNand between LED light fixture 7, comprise a current detecting chip 1, a field-effect transistor 4, resistance pressure-dividing network and a sampling resistor 2.The source electrode of field-effect transistor 4 couples power input V
iN, grid couples one end of sampling resistor 2, and the other end of sampling resistor 2 couples LED light fixture 7.Current detecting chip 1 comprises a current sense amplifier 101 and a voltage comparator 102, two of current sense amplifier 101 are detected the two ends that pin couples respectively sampling resistor 2, the output pin of current sense amplifier 101 couples the in-phase input end of voltage comparator 102 by a resistance pressure-dividing network, the locking output pin of voltage comparator 102 couples the drain electrode of field-effect transistor 4.When current sense amplifier 101 detects and amplifies after the electric current of sampling resistor 2, by resistance pressure-dividing network, enter voltage comparator 102, when the electric current of sampling resistor 2 surpasses preset value, the locking output pin of voltage comparator 102 becomes high level from low level, field-effect transistor 4 is cut off, thereby realizes the function of electronic circuit breaker.And the output pin of current sense amplifier 101 couples a LED electric current AD conversion port 10, realizes current sense function thereby have concurrently.Resistance pressure-dividing network comprises two resistance, couples the in-phase input end of voltage comparator 102 after first resistance 8 of output pin series connection of current sense amplifier 101, and the in-phase input end of voltage comparator 102 also couples the second resistance 9 of a ground connection.Voltage comparator 102 couples the reset switch 5 of a ground connection.
In actual use, in assurance sampling, export under the prerequisite that is unlikely to too little, the resistance of sampling resistor 2 is less, and measurement result 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 ohm.
Fig. 2 illustrates according to a specific embodiment of the present invention, the circuit diagram of the electronic circuit breaker that has current sense function concurrently of the LED of being applicable to light fixture of the present invention.As shown in Figure 2, in the present embodiment, the current detecting chip 1 of employing is current detecting comparable chip.
In the present embodiment, in current detecting comparable chip, corresponding pin application relation is as follows:
RS+ pin in current detecting comparable chip and RS-pin are that two of current sense amplifier 101 detect pin, in order to the electric current of common detection sampling resistor 2.
COUT pin in current detecting comparable chip is the locking output pin of voltage comparator 102.
VCC pin in current detecting comparable chip is chip power supply pin, and VCC pin connects power input V by one the 5th resistance 13
iN.In another embodiment, VCC pin also can directly pass through a DC power supply and ground connection.The operating voltage range of VCC pin is 2.7 to 28V.
RESET pin in current detecting comparable chip is the reset pin of voltage comparator 102.
OUT pin in current detecting comparable chip is the output pin of current sense amplifier 101.
CIN pin in current detecting comparable chip is the in-phase input end of voltage comparator 102.
In the present embodiment, the output of hypothesis driven module is 28V DC, and needing the threshold of setting is 1A.Because COUT pin output in current detecting comparable chip is the highest, only has 5V, so electronic circuit breaker of the present invention also comprises the triode 3 of an expansion voltage, the collector electrode of triode 3 couples the drain electrode of field-effect transistor 4, the emitter of triode 3 couples the locking output pin of voltage comparator 102, the base earth of triode 3.The 3rd resistance 11 of connecting between the locking output pin of voltage comparator 102 and the emitter of triode 3.The rear ground connection of the 4th resistance 12 of base stage series connection of triode 3.Meanwhile, because the input threshold of CIN pin in current detecting comparable chip is 600mV, can threshold be set voluntarily by resistance pressure-dividing network.
The operation logic of the electronic circuit breaker that has current sense function concurrently that is applicable to LED light fixture in the present embodiment is as follows:
Please also refer to Fig. 1 and Fig. 2, in current detecting comparable chip, comprised current sense amplifier 101 and voltage comparator 102.The resistance of the first resistance 8 is 27 kilo-ohms.The resistance of the second resistance 9 is 12 kilo-ohms.The resistance of the 3rd resistance 11 is 10 kilo-ohms.The resistance of the 4th resistance 12 is 100 kilo-ohms.Triode 3 is NPN type triodes.
It is that core is built circuit that the present invention adopts a current detecting chip.Design dexterously external circuit, realize to detect the hold concurrently function of overcurrent protection of LED electric current, be equivalent to an electronic circuit breaker.Abnormal in order the driver module that may occur to be detected, circuit module must be connected between driving and light fixture.The external high-precision sampling resistor 2 of current sense amplifier 101, sampling resistor 2 is connected with LED light fixture 7, and the electric current that flows through sampling resistor 2 is identical with LED electric current.By 2 pairs of LED electric currents of external sampling resistance, sample, by the computing of chip internal, whether exceed threshold with judging LED electric current after internal reference voltage ratio.If exceed threshold, chip, by a locking output pin, is exported a high level, now, by outside field-effect transistor 4, power circuit can be disconnected, and protection LED light fixture 7 is without prejudice.After inspection makes mistake, the electronic circuit breaker of can resetting, makes light fixture recover normal work.
The effect of sampling resistor 2 is as follows: current detecting chip needs an external sampling resistor 2, is connected between RS+ and RS-pin.Sampling resistor 2 must be high-precision, to guarantee the precision of sampling.In addition, resistance should be low as far as possible, because it is directly connected on current supply circuit, resistance is crossed conference and produced very large power consumption, thereby the excessive resistance of power consumption can generate heat and makes resistance produce larger variation.Resistance generally, below 1 Europe, is selected 0.1 Europe herein.
Current detecting output: chip has one tens times to the gain of hundreds of times to the pressure drop on sampling resistor 2, then exports at OUT pin.Its computing formula is as follows:
I
LED=V
OUT/(Gain·R
SENSE)
Wherein, V
oUTfor the output voltage values of OUT pin, Gain is chip gain multiple, and the gain that we select is herein 20 volts/volt, R
sENSEfor the resistance of inspection leakage resistance, I
lEDfor the current value on LED light fixture 7, i.e. current value on sampling resistor 2.So work as I
lEDthe value of reaching the limit of 1 ampere-hour, V
oUTfor
V
OUT=I
LED·Gain·R
SENSE=2V
Meanwhile, OUT pin can connect AD conversion port, and the real-time current of LED is provided, and can monitor the operating state of LED.
The setting of threshold: the reference voltage of the voltage comparator 102 in the present embodiment is 600 millivolts, internal circuit in voltage comparator 102 is as standard source, the input threshold of chip CIN pin is 600 millivolts, by the first resistance 8 on OUT and CIN, the potential-divider network of the second resistance 9 compositions, threshold can be set according to actual needs voluntarily.In the present embodiment, it is 1 peace that resistance=2.3 of resistance/the second resistance 9 of satisfied the first resistance 8 of potential-divider network can make threshold, the first resistance 8, the second resistance 9 are respectively 27 kilo-ohms, 12 kilo-ohms herein.
Open circuit and control the expansion of voltage range: according to chip-count according to data, the output of COUT is the highest only has 5 volts, and be 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 volts.
The control of opening circuit: when electric current surpasses thresholding, COUT pin can become high level from low level, thus can allow COUT control the logical and disconnected of field-effect transistor 4 control circuits.When circuit working is normal, COUT is output as low level, NPN conducting, and field-effect transistor 4 is also along with conducting.And when electric current surpasses thresholding, COUT output high level (and always maintaining high level), NPN cut-off, field-effect transistor 4 is also along with cut-off, and supply line is truncated, and LED light fixture 7 is protected.
The replacement of circuit breaker: if line fault is got rid of, trigger RESET pin can make circuit breaker reset by low level, COUT is output low level again, line conduction.
Certainly, the current detecting comparable chip in the present invention be changed to the chip with current sense amplifier and voltage comparator of other model and/or in circuit of the present invention, increase and decrease resistance, adjust within the transformations such as resistance all drop on protection scope of the present invention.
In summary, LED light fixture of the present invention and electronic circuit breaker thereof limit the electric current on LED light fixture, the connection of timely deenergization and load when overcurrent, and the while can be detected again the real-time working electric current of LED.
Above specific embodiments of the invention are described.It will be appreciated that, the present invention is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (10)
1. be applicable to an electronic circuit breaker for LED light fixture, be connected in series in power input (V
iN) and LED light fixture (7) between, it is characterized in that comprising:
One sampling resistor (2), one end of described sampling resistor (2) couples described LED light fixture (7);
One field-effect transistor (4), the source electrode of described field-effect transistor (4) couples described power input (V
iN), grid couples the other end of described sampling resistor (2);
One current detecting chip (1), described current detecting chip (1) comprising: a current sense amplifier (101) and a voltage comparator (102), two of described current sense amplifier (101) are detected the two ends that pin couples respectively described sampling resistor (2), the output pin of described current sense amplifier (101) couples a LED electric current AD conversion port (10) and by a resistance pressure-dividing network ground connection, the locking output pin of described voltage comparator (102) couples the drain electrode of described field-effect transistor (4);
When described current sense amplifier (101) detects and amplifies after the electric current of described sampling resistor (2), by described resistance pressure-dividing network, enter described voltage comparator (102), when the electric current of described sampling resistor (2) surpasses preset value, the locking output pin of described voltage comparator (102) becomes high level from low level, and described field-effect transistor (4) is cut off.
2. electronic circuit breaker as claimed in claim 1, it is characterized in that: also comprise a triode (3), the collector electrode of described triode (3) couples the drain electrode of described field-effect transistor (4), the emitter of described triode (3) couples the locking output pin of described voltage comparator (102), the base earth of described triode (3).
3. electronic circuit breaker as claimed in claim 2, is characterized in that: the 3rd resistance (11) of connecting between the locking output pin of described voltage comparator (102) and the emitter of described triode (3).
4. electronic circuit breaker as claimed in claim 2, is characterized in that: ground connection after the 4th resistance (12) of base stage series connection of described triode (3).
5. electronic circuit breaker as claimed in claim 2, is characterized in that: described triode (3) is NPN transistor.
6. electronic circuit breaker as claimed in claim 1, it is characterized in that: described resistance pressure-dividing network comprises two resistance, after output pin first resistance of series connection (8) of described current sense amplifier (101), couple one end of in-phase input end and second resistance (9) of described voltage comparator (102), the other end ground connection of the second resistance (9).
7. electronic circuit breaker as claimed in claim 1, is characterized in that: described voltage comparator (102) couples the reset switch (5) of a ground connection.
8. electronic circuit breaker as claimed in claim 1, is characterized in that: the resistance of described sampling resistor (2) is less than or equal to 1 ohm.
9. electronic circuit breaker as claimed in claim 8, is characterized in that: the resistance of described sampling resistor (2) is 0.1 ohm.
10. a LED light fixture that comprises the electronic circuit breaker described in any one in claim 1 to 9.
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 |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310102191.8A CN104078919B (en) | 2013-03-27 | 2013-03-27 | Led lamp and its electronic circuit breaker |
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|---|---|
| CN104078919A true CN104078919A (en) | 2014-10-01 |
| CN104078919B CN104078919B (en) | 2018-02-09 |
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| CN104375549A (en) * | 2014-10-30 | 2015-02-25 | 中国电子科技集团公司第三十六研究所 | Latching-preventing circuit of CMOS device |
| CN106451341A (en) * | 2016-11-22 | 2017-02-22 | 亿嘉和科技股份有限公司 | Load overcurrent protection circuit and load overcurrent protection method |
| CN106505528A (en) * | 2017-01-05 | 2017-03-15 | 科蒂斯技术（苏州）有限公司 | The flash that a kind of employing discrete component is realized drives current foldback circuit |
| CN106571616A (en) * | 2015-10-10 | 2017-04-19 | 中兴通讯股份有限公司 | Power supply dormancy and wake-up circuit |
| 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 |
| 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 |
| CN111200273A (en) * | 2018-11-16 | 2020-05-26 | 西门子股份公司 | Protective switching device for low-voltage circuits for detecting series fault arcs |
| CN111220895A (en) * | 2018-11-26 | 2020-06-02 | 奥特润株式会社 | Integrated circuit test equipment |
| 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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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104375549A (en) * | 2014-10-30 | 2015-02-25 | 中国电子科技集团公司第三十六研究所 | Latching-preventing circuit of CMOS device |
| CN106571616A (en) * | 2015-10-10 | 2017-04-19 | 中兴通讯股份有限公司 | Power supply dormancy and wake-up circuit |
| 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 |
| CN106451341A (en) * | 2016-11-22 | 2017-02-22 | 亿嘉和科技股份有限公司 | Load overcurrent protection circuit and load overcurrent protection method |
| CN106505528A (en) * | 2017-01-05 | 2017-03-15 | 科蒂斯技术（苏州）有限公司 | The flash that a kind of employing discrete component is realized drives current foldback circuit |
| 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 |
| CN111200273A (en) * | 2018-11-16 | 2020-05-26 | 西门子股份公司 | Protective switching device for low-voltage circuits for detecting series fault arcs |
| CN111200273B (en) * | 2018-11-16 | 2022-11-25 | 西门子股份公司 | Protective switching device for low-voltage circuits for detecting series fault arcs |
| CN111220895A (en) * | 2018-11-26 | 2020-06-02 | 奥特润株式会社 | Integrated circuit test equipment |
| US11587634B2 (en) | 2018-11-26 | 2023-02-21 | Hyundai Mobis Co., Ltd. | 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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