CN101861005A - LED drive circuit and portable lamp - Google Patents
LED drive circuit and portable lamp Download PDFInfo
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- CN101861005A CN101861005A CN201010141385A CN201010141385A CN101861005A CN 101861005 A CN101861005 A CN 101861005A CN 201010141385 A CN201010141385 A CN 201010141385A CN 201010141385 A CN201010141385 A CN 201010141385A CN 101861005 A CN101861005 A CN 101861005A
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- 238000005070 sampling Methods 0.000 claims abstract description 15
- 238000004146 energy storage Methods 0.000 claims description 23
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000002459 sustained effect Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 240000000233 Melia azedarach Species 0.000 claims description 2
- 238000005286 illumination Methods 0.000 abstract description 2
- 239000004065 semiconductor Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 230000001681 protective effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
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Abstract
The invention is applicable in the field of lamp illumination, and provides an LED drive circuit and a portable lamp. The LED drive circuit comprises a constant current control circuit, a ballast output circuit and a voltage sampling circuit; the voltage sampling circuit comprises a first switching element, a diode D1 and a current-limiting resistor R6; a control end of the first switching element is connected to the anode of the diode D1 through the current-limiting resistor R6, and the cathode of the diode D1 is connected to the output end of the ballast output circuit; the first end of the first switching element is connected with the enabling end of the constant current control circuit, and the second end is grounded; and when a short circuit is output, the first switching element is connected, the voltage of the enabling end of the constant current control circuit is dropped, and the constant current control circuit switches on or off the output. The LED drive circuit provided by the invention samples the working voltage of an LED by using the voltage sampling circuit; and when the short circuit is output, the voltage of the enabling end of the constant current control circuit is dropped through the connection of the first switching element, and the constant current control circuit switches on or off the output to play a role in short circuit protection.
Description
Technical field
The invention belongs to field of lamp illumination, relate in particular to a kind of led drive circuit and portable lamp.
Background technology
Existing short-circuit protection circuit all is the mode that adopts current sample, when output current is excessive, thereby turn-off output by short-circuit protection circuit light fixture is protected; Yet in the circuit of constant current output, the electric current of the electric current during load short circuits during with the load operate as normal is the same, so adopts the mode of the above-mentioned current sample light fixture can not be to short circuit the time to protect, and also caused waste of electric energy simultaneously.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of led drive circuit, is intended to solve the problem that the light fixture of existing led drive circuit can not be to short circuit in constant current output circuit the time effectively protected.
The embodiment of the invention is achieved in that a kind of led drive circuit, and it comprises: constant-current control circuit of Lian Jieing and ballast output circuit successively; The input of described constant-current control circuit is electrically connected with the power input of described led drive circuit; The output of described ballast output circuit is connected with the positive electrical of LED; The negative pole of described LED is electrically connected with the feedback end of described constant-current control circuit; Described led drive circuit also comprises: voltage sampling circuit; Described voltage sampling circuit comprises: first switch element, diode D1 and current-limiting resistance R6; The control end of described first switch element is connected to the anode of described diode D1 by described current-limiting resistance R6, and the negative electrode of described diode D1 is connected to the output of described ballast output circuit; First end of described first switch element is connected to the Enable Pin of described constant-current control circuit, and second end of described first switch element is connected with the power input negative pole of described led drive circuit, and tie point ground connection.
Further, described led drive circuit also comprises reverse-connection preventing circuit, and described reverse-connection preventing circuit comprises second switch element and divider resistance R1; First and second end of described second switch element is connected between the input cathode and ground of described led drive circuit power supply; The control end of described second switch element is connected with the power input of described led drive circuit is anodal by divider resistance R1.
Further, described led drive circuit also comprises the energy storage filter circuit, described energy storage filter circuit comprises the energy storing-releasing element between the power input positive pole of the input that is connected in series in described constant-current control circuit and described led drive circuit, and the power output end of described energy storing-releasing element is by filter element ground connection.
Further, described led drive circuit also comprises the energy storage filter circuit, and described energy storage filter circuit comprises the energy storage filter element; The tie point of the power input positive pole of the input of described constant-current control circuit and described led drive circuit is by described energy storage filter element ground connection.
Further, described constant-current control circuit comprises: constant current control chip U1 and peripheral circuit thereof; Described constant current control chip U1 comprises 8 terminals: voltage input end Vin, Enable Pin EN, compensation end COMP, hold GND, frequency selecting side FREQ, feedback end FB, BST and voltage output end SW; Wherein, voltage input end Vin is connected to Enable Pin EN by divider resistance R3, and Enable Pin EN is also by divider resistance R4 ground connection; Voltage input end Vin is as the input of described constant-current control circuit; Compensation end COMP is by filter capacitor C5 ground connection, and resistance R 7 and capacitor C 6 are connected in series between compensation end COMP and the ground end GND successively; Ground end GND ground connection; Frequency selecting side FREQ is connected with ground end GND by the oscillating circuit that is composed in parallel by capacitor C 8 and resistance R 8; Feedback end FB is connected with described LED negative pole, and tie point is by continuous current sampling resistor R12 ground connection; Feedback end FB is as the feedback end of described constant-current control circuit; Leading end BST is connected to voltage output end SW by shunt capacitance C9; Voltage output end SW is connected with the positive pole of described LED as the output of described constant-current control circuit.
Further, described ballast output circuit comprises: inductance L 1, sustained diode 2 and capacitor C 10; One end of described inductance L 1 is connected to the output of described constant-current control circuit, and the other end of described inductance L 1 is connected to the positive pole of described LED; Tie point between described inductance L 1 and the described constant-current control circuit output is connected the plus earth of described sustained diode 2 with the negative electrode of described sustained diode 2; The tie point of described LED and inductance L 1 is by described capacitor C 10 ground connection.
The purpose of the embodiment of the invention also is to provide a kind of portable lamp, and it comprises LED and above-mentioned led drive circuit.
Led drive circuit provided by the invention adopts voltage sampling circuit that the operating voltage of LED is sampled; when output short-circuit; conducting by first switch element makes that the voltage of Enable Pin of constant-current control circuit is dragged down; constant-current control circuit turn-offs output, thereby plays the effect of short-circuit protection.
Description of drawings
Fig. 1 is the modular structure schematic diagram of the led drive circuit that provides of the embodiment of the invention;
Fig. 2 is the circuit theory diagrams of the led drive circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Led drive circuit provided by the invention adopts voltage sampling circuit that the operating voltage of LED is sampled; when output short-circuit; conducting by first switch element makes that the voltage of Enable Pin of constant-current control circuit is dragged down; constant-current control circuit turn-offs output, thereby plays the effect of short-circuit protection.
The led drive circuit that the embodiment of the invention provides is mainly used in the continuously adjustable portable lamp of potentiometer formula brightness, and this portable lamp comprises LED and the led drive circuit that is used for driving LED work that is connected with LED; Wherein the modular structure principle of led drive circuit as shown in Figure 1, the physical circuit of led drive circuit is as shown in Figure 2; For convenience of explanation, only show the part relevant with the embodiment of the invention, details are as follows.
A kind of led drive circuit comprises: constant-current control circuit 3, ballast output circuit 4 and voltage sampling circuit 5; The input of constant-current control circuit 3 is electrically connected with the power input of led drive circuit (being the output of DC power supply 7), the input of ballast output circuit 4 is connected to the output of constant-current control circuit 3, the output of ballast output circuit 4 connects the power supply input positive pole of LED6, and the power supply input negative pole of LED 6 is connected to the feedback end of constant-current control circuit 3; Wherein, voltage sampling circuit 5 comprises: first switch element, diode D1 and current-limiting resistance R6; The control end of first switch element is connected to the anode of diode D1 by current-limiting resistance R6, and the negative electrode of diode D1 is connected to the output of ballast output circuit 4; First end of first switch element is connected to the Enable Pin of constant-current control circuit 3, and second end of first switch element is connected with the power input negative pole of led drive circuit, and tie point ground connection; When output short-circuit, the control end of first switch element is controlled conducting between its first end and second end, and the voltage of the Enable Pin of constant-current control circuit 3 is dragged down, and constant-current control circuit 3 turn-offs output, thereby plays the short-circuit protection effect.
The led drive circuit that the embodiment of the invention provides is mainly used in the constant-current driving light fixture; when output short-circuit, light fixture is protected; solve the short-circuit protection problem of the constant current output circuit that the current sample protective circuit cann't be solved, also reduced waste of electric energy simultaneously.
In embodiments of the present invention, first switch element can be the switch element of any on-off actions such as triode, metal-oxide-semiconductor; When first switch element was triode Q2, the base stage of triode Q2 was as the control end of first switch element, and the emitter of triode Q2 is as first end of first switch element, and the collector electrode of triode Q2 is as second end of first switch element.
As one embodiment of the present of invention, when first switch element was triode Q2, voltage sampling circuit 5 also comprised: the base stage and the resistance R between the emitter 5 that are connected triode.
As one embodiment of the present of invention, led drive circuit can also comprise: be connected the energy storage filter circuit 2 between the input of the output of DC power supply 7 and constant-current control circuit 3.
As an alternative embodiment of the invention, led drive circuit also comprises: be connected the reverse-connection preventing circuit 1 between the input of the output of DC power supply 7 and constant-current control circuit 3.The main effect of reverse-connection preventing circuit 1 is to prevent from that the power supply input from connecing instead can burn out components and parts.
In addition, led drive circuit can also comprise simultaneously: reverse-connection preventing circuit 1 and energy storage filter circuit 2; Wherein, the input of reverse-connection preventing circuit 1 is connected to the output of DC power supply 7, and the input of energy storage filter circuit 2 is connected to the output of reverse-connection preventing circuit 1, and the output of energy storage filter circuit 2 is connected to the input of constant-current control circuit 3.
As one embodiment of the present of invention, energy storage filter circuit 2 comprises: be connected in series in the input of constant-current control circuit 3 and energy storing-releasing element and the filter element between the led drive circuit power input positive pole; The power output end of energy storing-releasing element is by filter element ground connection.Wherein, the energy storing-releasing element can be capacitor C 1, and capacitor C 1 is used for energy storage and low frequency filtering, when battery in vibration during instant power-down, can be by the power supply of capacitor C 1 holding circuit; Filter element can be capacitor C 2, and capacitor C 2 is used for High frequency filter.In addition, the energy storing-releasing element can also for inductance or other can energy storage element.
As an alternative embodiment of the invention, energy storage filter circuit 2 comprises the energy storage filter element; The tie point of the power input positive pole of the input of constant-current control circuit 3 and led drive circuit is by energy storage filter element ground connection.Wherein, the energy storage filter element can be electric capacity.
As an alternative embodiment of the invention, reverse-connection preventing circuit 1 comprises: second switch element and divider resistance R1; Wherein first and second end of second switch element is connected between the input cathode and ground of led drive circuit power supply; The control end of second switch element is connected with the power input of led drive circuit is anodal by divider resistance R1.As one embodiment of the present of invention, the second switch element can be metal-oxide-semiconductor Q1, the grid of metal-oxide-semiconductor Q1 is as the control end of second switch element, and the drain electrode of metal-oxide-semiconductor Q1 is as first end of second switch element, and the source electrode of metal-oxide-semiconductor Q1 is as second end of second switch element.When the second switch element was metal-oxide-semiconductor Q1, reverse-connection preventing circuit 1 also comprised grid and the resistance R between the source electrode 2 that is connected metal-oxide-semiconductor Q1.
In embodiments of the present invention, constant-current control circuit 3 comprises: chip U1 and peripheral circuit thereof; Chip U1 comprises 8 terminals: voltage input end Vin, Enable Pin EN, compensation end COMP, hold GND, frequency selecting side FREQ, feedback end FB, leading end BST, voltage output end SW; Wherein, voltage input end Vin is connected to Enable Pin EN by divider resistance R3, and Enable Pin EN is also by divider resistance R4 ground connection; Voltage input end Vin is as the input of constant-current control circuit 3; Compensation end COMP is by filter capacitor C5 ground connection, and resistance R 7 and capacitor C 6 are connected in series between compensation end COMP and the ground end GND successively; Ground end GND ground connection; Frequency selecting side FREQ is by capacitor C 8 ground connection, and frequency selecting side FREQ is also by resistance R 8 ground connection; Feedback end FB is by resistance R 12 ground connection; Feedback end FB is as the feedback end of constant-current control circuit 3; Leading end BST is connected to voltage output end SW by shunt capacitance C9; The high-end mosfet driver that leading end BST floats for inside provides a positive supply; Voltage output end SW is as the output of constant-current control circuit 3.
In embodiments of the present invention, ballast output circuit 4 comprises: inductance L 1, sustained diode 2 and capacitor C 10; One end of inductance L 1 is connected to the output of constant-current control circuit 3, and the other end of inductance L 1 is connected to the positive pole of LED 6; The negative electrode of sustained diode 2 is connected the plus earth of sustained diode 2 with the tie point of inductance L 1 with constant-current control circuit 3 outputs; One end of capacitor C 10 is connected to the link that inductance L 1 is connected with LED 6, the other end ground connection of capacitor C 10.
For the led drive circuit that illustrates that further the embodiment of the invention provides, it is as follows now in conjunction with Fig. 2 in detail its operation principle to be described in detail:
When the entire circuit operate as normal, the anodal current potential of the power supply of LED6 input is a high level, and the base stage of triode Q2 is a high level, and triode Q2 is in cut-off state, and the level of the Enable Pin EN of control chip U1 is a high level, and control chip U1 keeps output.
When output short-circuit, the anodal current potential of the power supply of LED6 input is a low level, and the base stage of triode Q2 is drawn to be low level; triode Q2 is open-minded; the level of the Enable Pin EN of control chip U1 is dragged down, and control chip U1 turn-offs output, thereby plays the effect of short-circuit protection.
Led drive circuit provided by the invention adopts voltage sampling circuit that the operating voltage of LED is sampled; when output short-circuit; conducting by first switch element makes that the voltage of Enable Pin of constant-current control circuit is dragged down; constant-current control circuit turn-offs output, thereby plays the effect of short-circuit protection.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. led drive circuit, it comprises: constant-current control circuit of Lian Jieing and ballast output circuit successively; The input of described constant-current control circuit is electrically connected with the power input of described led drive circuit; The output of described ballast output circuit is connected with the positive electrical of LED; The negative pole of described LED is electrically connected with the feedback end of described constant-current control circuit; It is characterized in that described led drive circuit also comprises:
Voltage sampling circuit; Described voltage sampling circuit comprises: first switch element, diode D1 and current-limiting resistance R6;
The control end of described first switch element is connected to the anode of described diode D1 by described current-limiting resistance R6, and the negative electrode of described diode D1 is connected to the output of described ballast output circuit;
First end of described first switch element is connected to the Enable Pin of described constant-current control circuit, and second end of described first switch element is connected with the power input negative pole of described led drive circuit, and tie point ground connection.
2. led drive circuit as claimed in claim 1 is characterized in that described led drive circuit also comprises reverse-connection preventing circuit, and described reverse-connection preventing circuit comprises second switch element and divider resistance R1; First and second end of described second switch element is connected between the power input negative pole and ground of described led drive circuit; The control end of described second switch element is connected with the power input of described led drive circuit is anodal by divider resistance R1.
3. led drive circuit as claimed in claim 1, it is characterized in that, described led drive circuit also comprises the energy storage filter circuit, and described energy storage filter circuit comprises the energy storing-releasing element between the power input positive pole of the input that is connected in series in described constant-current control circuit and described led drive circuit; The power output end of described energy storing-releasing element is by filter element ground connection.
4. led drive circuit as claimed in claim 1 is characterized in that described led drive circuit also comprises the energy storage filter circuit, and described energy storage filter circuit comprises the energy storage filter element; The tie point of the power input positive pole of the input of described constant-current control circuit and described led drive circuit is by described energy storage filter element ground connection.
5. led drive circuit as claimed in claim 1 is characterized in that described constant-current control circuit comprises constant current control chip U1 and peripheral circuit thereof;
Described constant current control chip U1 comprises 8 terminals: voltage input end Vin, Enable Pin EN, compensation end COMP, hold GND, frequency selecting side FREQ, feedback end FB, BST and voltage output end SW;
Wherein, voltage input end Vin is connected to Enable Pin EN by divider resistance R3, and Enable Pin EN is also by divider resistance R4 ground connection; Voltage input end Vin is as the input of described constant-current control circuit;
Compensation end COMP is by filter capacitor C5 ground connection, and resistance R 7 and capacitor C 6 are connected in series between compensation end COMP and the ground end GND successively;
Ground end GND ground connection;
Frequency selecting side FREQ is connected with ground end GND by the oscillating circuit that is composed in parallel by capacitor C 8 and resistance R 8;
Feedback end FB is connected with described LED negative pole, and tie point is by continuous current sampling resistor R12 ground connection; Feedback end FB is as the feedback end of described constant-current control circuit;
Leading end BST is connected to voltage output end SW by shunt capacitance C9;
Voltage output end SW is connected with the positive pole of described LED as the output of described constant-current control circuit.
6. led drive circuit as claimed in claim 1 is characterized in that, described ballast output circuit comprises: inductance L 1, sustained diode 2 and capacitor C 10;
One end of described inductance L 1 is connected to the output of described constant-current control circuit, and the other end of described inductance L 1 is connected to the positive pole of described LED;
Tie point between described inductance L 1 and the described constant-current control circuit output is connected the plus earth of described sustained diode 2 with the negative electrode of described sustained diode 2;
The tie point of described LED and inductance L 1 is by described capacitor C 10 ground connection.
7. portable lamp, it comprises LED, it is characterized in that, described portable lamp also comprises each described led drive circuit of claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010141385A CN101861005A (en) | 2010-04-01 | 2010-04-01 | LED drive circuit and portable lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010141385A CN101861005A (en) | 2010-04-01 | 2010-04-01 | LED drive circuit and portable lamp |
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| CN101861005A true CN101861005A (en) | 2010-10-13 |
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| CN201010141385A Pending CN101861005A (en) | 2010-04-01 | 2010-04-01 | LED drive circuit and portable lamp |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102137534A (en) * | 2011-01-26 | 2011-07-27 | 深圳茂硕电源科技股份有限公司 | Virtual ground type high-voltage constant-current circuit |
| CN102256417A (en) * | 2011-07-12 | 2011-11-23 | 科博达技术有限公司 | Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology |
| CN102595685A (en) * | 2011-01-05 | 2012-07-18 | 上海米开罗那机电技术有限公司 | Device for improving performances of automotive head lamp |
| CN102651929A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) driven short-circuit protection circuit |
| CN102685966A (en) * | 2011-03-10 | 2012-09-19 | 海洋王照明科技股份有限公司 | Constant current circuit and lamp |
| CN102739090A (en) * | 2012-07-02 | 2012-10-17 | 华为技术有限公司 | Overcurrent protection device and method for inverter as well as inverter |
| CN102769959A (en) * | 2011-05-06 | 2012-11-07 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN102811527A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED frequency-variable marker lamp and control circuit and control method of marker lamp |
| CN102833902A (en) * | 2011-06-14 | 2012-12-19 | 海洋王照明科技股份有限公司 | Boosting LED (light-emitting diode) constant-current drive circuit |
| CN102858048A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN103379698A (en) * | 2012-04-25 | 2013-10-30 | 海洋王照明科技股份有限公司 | LED constant current drive circuit with short-circuit protection |
| CN103595035A (en) * | 2013-11-14 | 2014-02-19 | 江苏绿扬电子仪器集团有限公司 | Protective circuit capable of improving performance of power source |
| CN103906297A (en) * | 2012-12-28 | 2014-07-02 | 欧普照明股份有限公司 | A light source drive circuit and a lamp with the drive circuit |
| CN107995749A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The driving short-circuit protection circuit of classroom blackboard LED light strip |
| CN108055732A (en) * | 2017-12-28 | 2018-05-18 | 广州爱易学智能信息科技有限公司 | The current constant control protection circuit of classroom blackboard LED light strip |
| CN108063437A (en) * | 2017-12-28 | 2018-05-22 | 广州爱易学智能信息科技有限公司 | The short-circuit protection circuit of classroom blackboard LED light strip |
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| CN102595685A (en) * | 2011-01-05 | 2012-07-18 | 上海米开罗那机电技术有限公司 | Device for improving performances of automotive head lamp |
| CN102137534A (en) * | 2011-01-26 | 2011-07-27 | 深圳茂硕电源科技股份有限公司 | Virtual ground type high-voltage constant-current circuit |
| CN102137534B (en) * | 2011-01-26 | 2013-10-16 | 茂硕电源科技股份有限公司 | Virtual ground type high-voltage constant-current circuit |
| CN102651929A (en) * | 2011-02-25 | 2012-08-29 | 海洋王照明科技股份有限公司 | LED (Light-Emitting Diode) driven short-circuit protection circuit |
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| CN102685966B (en) * | 2011-03-10 | 2015-10-28 | 海洋王照明科技股份有限公司 | A kind of constant-current circuit and light fixture |
| CN102769959B (en) * | 2011-05-06 | 2014-10-15 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN102769959A (en) * | 2011-05-06 | 2012-11-07 | 海洋王照明科技股份有限公司 | LED light-dimming driving circuit |
| CN102811527A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED frequency-variable marker lamp and control circuit and control method of marker lamp |
| CN102833902B (en) * | 2011-06-14 | 2015-09-23 | 海洋王照明科技股份有限公司 | Booster type constant current driver circuit for LED |
| CN102833902A (en) * | 2011-06-14 | 2012-12-19 | 海洋王照明科技股份有限公司 | Boosting LED (light-emitting diode) constant-current drive circuit |
| CN102858048A (en) * | 2011-06-30 | 2013-01-02 | 海洋王照明科技股份有限公司 | LED driving circuit and LED lamp |
| CN102256417B (en) * | 2011-07-12 | 2013-12-18 | 科博达技术有限公司 | Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology |
| CN102256417A (en) * | 2011-07-12 | 2011-11-23 | 科博达技术有限公司 | Light-emitting diode (LED) lamp controller based on digital pulse-width modulation (PWM) control technology |
| CN103379698B (en) * | 2012-04-25 | 2016-05-18 | 海洋王照明科技股份有限公司 | There is the LED constant-current drive circuit of short-circuit protection |
| CN103379698A (en) * | 2012-04-25 | 2013-10-30 | 海洋王照明科技股份有限公司 | LED constant current drive circuit with short-circuit protection |
| CN102739090A (en) * | 2012-07-02 | 2012-10-17 | 华为技术有限公司 | Overcurrent protection device and method for inverter as well as inverter |
| CN102739090B (en) * | 2012-07-02 | 2014-06-25 | 华为技术有限公司 | Overcurrent protection device and method for inverter as well as inverter |
| CN103906297A (en) * | 2012-12-28 | 2014-07-02 | 欧普照明股份有限公司 | A light source drive circuit and a lamp with the drive circuit |
| CN103595035A (en) * | 2013-11-14 | 2014-02-19 | 江苏绿扬电子仪器集团有限公司 | Protective circuit capable of improving performance of power source |
| CN107995749A (en) * | 2017-12-28 | 2018-05-04 | 广州爱易学智能信息科技有限公司 | The driving short-circuit protection circuit of classroom blackboard LED light strip |
| CN108055732A (en) * | 2017-12-28 | 2018-05-18 | 广州爱易学智能信息科技有限公司 | The current constant control protection circuit of classroom blackboard LED light strip |
| CN108063437A (en) * | 2017-12-28 | 2018-05-22 | 广州爱易学智能信息科技有限公司 | The short-circuit protection circuit of classroom blackboard LED light strip |
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Application publication date: 20101013 |