CN102801137A - Light-emitting diode (LED) short circuit protection circuit and light fitting - Google Patents

Light-emitting diode (LED) short circuit protection circuit and light fitting Download PDF

Info

Publication number
CN102801137A
CN102801137A CN2011101367368A CN201110136736A CN102801137A CN 102801137 A CN102801137 A CN 102801137A CN 2011101367368 A CN2011101367368 A CN 2011101367368A CN 201110136736 A CN201110136736 A CN 201110136736A CN 102801137 A CN102801137 A CN 102801137A
Authority
CN
China
Prior art keywords
divider resistance
switching tube
led
comparing unit
semiconductor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2011101367368A
Other languages
Chinese (zh)
Other versions
CN102801137B (en
Inventor
周明杰
孙占民
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
Original Assignee
Oceans King Lighting Science and Technology Co Ltd
Shenzhen Oceans King Lighting Engineering Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Oceans King Lighting Science and Technology Co Ltd, Shenzhen Oceans King Lighting Engineering Co Ltd filed Critical Oceans King Lighting Science and Technology Co Ltd
Priority to CN201110136736.8A priority Critical patent/CN102801137B/en
Publication of CN102801137A publication Critical patent/CN102801137A/en
Application granted granted Critical
Publication of CN102801137B publication Critical patent/CN102801137B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

The invention is suitable for the field of protection circuits, and particularly relates to a light-emitting diode (LED) short circuit protection circuit and a light fitting. In the embodiment of the invention, the LED short circuit protection circuit consists of discrete components, and when an LED is short-circuited, a power supply output voltage can be cut off to fulfill the aim of short circuit protection; and the LED short circuit protection circuit is simple in structure and low in cost.

Description

A kind of LED short-circuit protection circuit and light fixture
Technical field
The invention belongs to the protective circuit field, relate in particular to a kind of LED short-circuit protection circuit and light fixture.
Background technology
LED is as new type light source, and it has energy-saving and environmental protection, characteristics of high efficiency, and the LED technology is ripe and be applied to every field; LED is widely used as lighting source; But LED tends to occur short-circuit state when the operation irregularity situation, so in led drive circuit, need to add short-circuit protection; Thereby after the LED short circuit, effectively protect, prevent that fault from continuing to enlarge.Mostly the existing protective circuit that prevents the LED short circuit is through single-chip microcomputer sampled voltage and output control; Although adopt Single-chip Controlling to have the efficient height, use advantages such as flexible; Therefore but single-chip microcomputer need cooperate multiple devices such as a reference source, sample circuit to work, and has big, the complex structure of taking up room, many shortcomings such as with high costs.
Summary of the invention
The object of the present invention is to provide a kind of LED short-circuit protection circuit, be intended to solve present LED short-circuit protection circuit and have complex structure, problem with high costs.
The present invention is achieved in that a kind of LED short-circuit protection circuit, is used to connect the LED load, and said LED short-circuit protection circuit comprises:
Filter capacitor C1, voltage stabilizing chip U1, comparing unit, current-limiting resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, current-limiting resistance R5, divider resistance R6, divider resistance R7, P type metal-oxide-semiconductor Q1, switching tube and LED constant current unit;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of LED short-circuit protection circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects the input of LED constant current unit; The output of said LED constant current unit is the anode of the output termination LED load of LED short-circuit protection circuit; The minus earth of LED load, first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, the power end of the output termination comparing unit of said voltage stabilizing chip U1 and first end of divider resistance R6, and second end of said divider resistance R6 is through divider resistance R7 ground connection; The first input end of said comparing unit connects the public connecting end of divider resistance R6 and divider resistance R7; Second input of said comparing unit connects the anode of LED load through current-limiting resistance R5, the output termination control end of switching tube of said comparing unit, and said divider resistance R2 and divider resistance R3 are connected between positive source and the ground; Said control end of switching tube connects the public connecting end of divider resistance R2 and divider resistance R3; The cold end ground connection of said switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, said divider resistance R4 is connected between the hot end of positive source and switching tube.
Another object of the present invention is to provide a kind of light fixture, comprise the LED load, said light fixture comprises the LED short-circuit protection circuit, and said LED short-circuit protection circuit comprises:
Filter capacitor C1, voltage stabilizing chip U1, comparing unit, current-limiting resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, current-limiting resistance R5, divider resistance R6, divider resistance R7, P type metal-oxide-semiconductor Q1, switching tube and LED constant current unit;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of LED short-circuit protection circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects the input of LED constant current unit; The output of said LED constant current unit is the anode of the output termination LED load of LED short-circuit protection circuit; The minus earth of LED load, first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, the power end of the output termination comparing unit of said voltage stabilizing chip U1 and first end of divider resistance R6, and second end of said divider resistance R6 is through divider resistance R7 ground connection; The first input end of said comparing unit connects the public connecting end of divider resistance R6 and divider resistance R7; Second input of said comparing unit connects the anode of LED load through current-limiting resistance R5, the output termination control end of switching tube of said comparing unit, and said divider resistance R2 and divider resistance R3 are connected between positive source and the ground; Said control end of switching tube connects the public connecting end of divider resistance R2 and divider resistance R3; The cold end ground connection of said switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, said divider resistance R4 is connected between the hot end of positive source and switching tube.
In the present invention, this LED short-circuit protection circuit adopts discrete component to constitute, and when short circuit appearred in LED, the output voltage of can cutting off the electricity supply reach the purpose of short-circuit protection, and the LED short-circuit protection circuit was simple in structure, with low cost.
Description of drawings
Fig. 1 is the circuit structure diagram of the LED short-circuit protection circuit that provides of first embodiment of the invention;
Fig. 2 is the circuit structure diagram of the LED short-circuit protection circuit that provides of second embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.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.
Fig. 1 shows the circuit structure of the LED short-circuit protection circuit that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
The LED short-circuit protection circuit is used to connect LED load D1, and the LED short-circuit protection circuit comprises:
Filter capacitor C1, voltage stabilizing chip U1, comparing unit 100, current-limiting resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, current-limiting resistance R5, divider resistance R6, divider resistance R7, P type metal-oxide-semiconductor Q1, switching tube 200 and LED constant current unit 300.
The source electrode of P type metal-oxide-semiconductor Q1 is the input termination positive source of LED short-circuit protection circuit; The drain electrode of P type metal-oxide-semiconductor Q1 connects the input of LED constant current unit 300; The output of LED constant current unit 300 is the anode of the output termination LED load D1 of LED short-circuit protection circuit, the minus earth of LED load D1.First termination power of current-limiting resistance R1 is anodal; The input Vin of the second termination voltage stabilizing chip U1 of current-limiting resistance R1; The earth terminal gnd ground connection of voltage stabilizing chip U1, filter capacitor C1 is connected between the output end vo ut and ground of voltage stabilizing chip U1, is used for stablizing the output voltage of voltage stabilizing chip U1; The output end vo ut of voltage stabilizing chip U1 connects the power end of comparing unit 100 and first end of divider resistance R6; Second end of divider resistance R6 is through divider resistance R7 ground connection, and the first input end of comparing unit 100 connects the public connecting end of divider resistance R6 and divider resistance R7, and second input of comparing unit 100 connects the anode of LED load D1 through current-limiting resistance R5; The control end of the output termination switching tube 200 of comparing unit 100; Divider resistance R2 and divider resistance R3 are connected between positive source and the ground, the control termination divider resistance R2 of switching tube 200 and the public connecting end of divider resistance R3, the cold end ground connection of switching tube 200; The grid of the high potential termination P type metal-oxide-semiconductor Q1 of switching tube 200, divider resistance R4 is connected between the hot end of positive source and switching tube 200.
As one embodiment of the invention, switching tube 200 adopts triode Q2, and the base stage of triode Q2 is the control end of switching tube 200, and the current collection of triode Q2 is the hot end of switching tube 200 very, and the emission of triode Q2 is the cold end of switching tube 200 very.
As one embodiment of the invention; Comparing unit 100 adopts comparator chip U2; The inverting input N-INPUTB of comparator chip U2 is the first input end of comparing unit 100; The in-phase input end INPUTB of comparator chip U2 is second input of comparing unit 100, and the output OUTB of comparator chip U2 is the output of comparing unit 100, and the power end VCC of comparator chip U2 is the power end of comparing unit 100.
As one embodiment of the invention, voltage stabilizing chip U1 adopts the LM7805 chip.
As one embodiment of the invention, comparator chip U2 adopts the LM258 chip, and the LM258 chip is the dual comparator chip, and certainly, comparator chip U2 also can adopt single comparator chip or many comparators chip.
Fig. 2 shows the circuit structure of the LED short-circuit protection circuit that second embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
As one embodiment of the invention, switching tube 200 adopts N type metal-oxide-semiconductor Q3, and the grid of N type metal-oxide-semiconductor Q3 is the control end of switching tube 200, and the drain electrode of N type metal-oxide-semiconductor Q3 is the hot end of switching tube 200, and the source electrode of N type metal-oxide-semiconductor Q3 is the cold end of switching tube 200.
Adopting triode Q2 with switching tube 200 below is example, and the operation principle of LED short-circuit protection circuit is described:
When energized, voltage stabilizing chip U1 operate as normal and output+5V voltage, comparator chip U2 starts working; If LED load this moment D1 operate as normal, the voltage of the in-phase input end INPUTB of comparator chip U2 is higher than the voltage of inverting input N-INPUTB, and the output OUTB output high level of comparator chip U2 is to the base stage of triode Q2; Again because of divider resistance R2 and divider resistance R3; So triode Q2 base voltage is high level and is opening state that P type metal-oxide-semiconductor Q1 grid is connected to GND through triode Q2 collector and emitter so, and P type metal-oxide-semiconductor Q1 grid voltage is a low level; P type metal-oxide-semiconductor Q1 gets into conducting state; The source electrode of P type metal-oxide-semiconductor Q1 is straight-through with drain electrode so, and output voltage gives LED constant current unit 300 power supplies, LED load D1 constant current work.
When LED load D1 short circuit, the voltage of the in-phase input end INPUTB of comparator chip U2 is 0, is lower than the voltage of inverting input N-INPUTB; So the output OUTB output low level of comparator chip U2, triode Q2 base stage level is dragged down so, becomes low and the entering off state by height; P type metal-oxide-semiconductor Q1 grid level is by the low height that becomes so; P type metal-oxide-semiconductor Q1 gets into off state, and the source electrode of P type metal-oxide-semiconductor Q1 breaks off with drain electrode so, gets into the short-circuit protection state and removes up to short trouble.
If LED load D1 work recovers normal, the in-phase input end INPUTB voltage of comparator chip U2 is higher than inverting input N-INPUTB voltage again, and output OUTB output is high level by the low level upset; Triode Q2 base stage level is by the low height that becomes; Triode Q2 gets into conducting state, and P type metal-oxide-semiconductor Q1 grid level is then become lowly by height so, and P type metal-oxide-semiconductor Q1 gets into conducting state so; The source electrode of P type metal-oxide-semiconductor Q1 is straight-through with drain electrode so, the beginning normal power supply.
The embodiment of the invention also provides a kind of light fixture, comprises the LED load, also comprises aforesaid LED short-circuit protection circuit.
With respect to prior art; The LED short-circuit protection circuit that the embodiment of the invention provides adopts discrete component to constitute, when short circuit appears in LED, and the output voltage of can cutting off the electricity supply; Reach the purpose of short-circuit protection, and this LED short-circuit protection circuit is simple in structure, with low cost.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (10)

1. a LED short-circuit protection circuit is used to connect the LED load, it is characterized in that, said LED short-circuit protection circuit comprises:
Filter capacitor C1, voltage stabilizing chip U1, comparing unit, current-limiting resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, current-limiting resistance R5, divider resistance R6, divider resistance R7, P type metal-oxide-semiconductor Q1, switching tube and LED constant current unit;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of LED short-circuit protection circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects the input of LED constant current unit; The output of said LED constant current unit is the anode of the output termination LED load of LED short-circuit protection circuit; The minus earth of LED load, first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, the power end of the output termination comparing unit of said voltage stabilizing chip U1 and first end of divider resistance R6, and second end of said divider resistance R6 is through divider resistance R7 ground connection; The first input end of said comparing unit connects the public connecting end of divider resistance R6 and divider resistance R7; Second input of said comparing unit connects the anode of LED load through current-limiting resistance R5, the output termination control end of switching tube of said comparing unit, and said divider resistance R2 and divider resistance R3 are connected between positive source and the ground; Said control end of switching tube connects the public connecting end of divider resistance R2 and divider resistance R3; The cold end ground connection of said switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, said divider resistance R4 is connected between the hot end of positive source and switching tube.
2. LED short-circuit protection circuit as claimed in claim 1; It is characterized in that; Said switching tube adopts triode Q2; The base stage of said triode Q2 is a control end of switching tube, and the current collection of said triode Q2 is the hot end of switching tube very, and the emission of said triode Q2 is the cold end of switching tube very.
3. LED short-circuit protection circuit as claimed in claim 1; It is characterized in that; Said switching tube adopts N type metal-oxide-semiconductor Q3; The grid of said N type metal-oxide-semiconductor Q3 is a control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of said N type metal-oxide-semiconductor Q3 is the cold end of switching tube.
4. LED short-circuit protection circuit as claimed in claim 1; It is characterized in that; Said comparing unit adopts comparator chip U2, and the inverting input of said comparator chip U2 is the first input end of comparing unit, and the in-phase input end of said comparator chip U2 is second input of comparing unit; The output of said comparator chip U2 is the output of comparing unit, and the power end of said comparator chip U2 is the power end of comparing unit.
5. LED short-circuit protection circuit as claimed in claim 4 is characterized in that, said comparator chip U2 adopts the LM258 chip.
6. a light fixture comprises the LED load, it is characterized in that, said light fixture comprises the LED short-circuit protection circuit, and said LED short-circuit protection circuit comprises:
Filter capacitor C1, voltage stabilizing chip U1, comparing unit, current-limiting resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, current-limiting resistance R5, divider resistance R6, divider resistance R7, P type metal-oxide-semiconductor Q1, switching tube and LED constant current unit;
The source electrode of said P type metal-oxide-semiconductor Q1 is the input termination positive source of LED short-circuit protection circuit; The drain electrode of said P type metal-oxide-semiconductor Q1 connects the input of LED constant current unit; The output of said LED constant current unit is the anode of the output termination LED load of LED short-circuit protection circuit; The minus earth of LED load, first termination power of said current-limiting resistance R1 is anodal, the input of the second termination voltage stabilizing chip U1 of said current-limiting resistance R1; The earth terminal ground connection of said voltage stabilizing chip U1; Said filter capacitor C1 is connected between the output and ground of voltage stabilizing chip U1, the power end of the output termination comparing unit of said voltage stabilizing chip U1 and first end of divider resistance R6, and second end of said divider resistance R6 is through divider resistance R7 ground connection; The first input end of said comparing unit connects the public connecting end of divider resistance R6 and divider resistance R7; Second input of said comparing unit connects the anode of LED load through current-limiting resistance R5, the output termination control end of switching tube of said comparing unit, and said divider resistance R2 and divider resistance R3 are connected between positive source and the ground; Said control end of switching tube connects the public connecting end of divider resistance R2 and divider resistance R3; The cold end ground connection of said switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q1 of said switching tube, said divider resistance R4 is connected between the hot end of positive source and switching tube.
7. light fixture as claimed in claim 6; It is characterized in that said switching tube adopts triode Q2, the base stage of said triode Q2 is a control end of switching tube; The current collection of said triode Q2 is the hot end of switching tube very, and the emission of said triode Q2 is the cold end of switching tube very.
8. light fixture as claimed in claim 6; It is characterized in that said switching tube adopts N type metal-oxide-semiconductor Q3, the grid of said N type metal-oxide-semiconductor Q3 is a control end of switching tube; The drain electrode of said N type metal-oxide-semiconductor Q3 is the hot end of switching tube, and the source electrode of said N type metal-oxide-semiconductor Q3 is the cold end of switching tube.
9. light fixture as claimed in claim 6; It is characterized in that; Said comparing unit adopts comparator chip U2, and the inverting input of said comparator chip U2 is the first input end of comparing unit, and the in-phase input end of said comparator chip U2 is second input of comparing unit; The output of said comparator chip U2 is the output of comparing unit, and the power end VCC of said comparator chip U2 is the power end of comparing unit.
10. light fixture as claimed in claim 9 is characterized in that, said comparator chip U2 adopts the LM258 chip.
CN201110136736.8A 2011-05-25 2011-05-25 A kind of LED short-circuit protection circuit and light fixture Active CN102801137B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201110136736.8A CN102801137B (en) 2011-05-25 2011-05-25 A kind of LED short-circuit protection circuit and light fixture

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201110136736.8A CN102801137B (en) 2011-05-25 2011-05-25 A kind of LED short-circuit protection circuit and light fixture

Publications (2)

Publication Number Publication Date
CN102801137A true CN102801137A (en) 2012-11-28
CN102801137B CN102801137B (en) 2015-10-28

Family

ID=47200156

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201110136736.8A Active CN102801137B (en) 2011-05-25 2011-05-25 A kind of LED short-circuit protection circuit and light fixture

Country Status (1)

Country Link
CN (1) CN102801137B (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103915822A (en) * 2012-12-31 2014-07-09 海洋王(东莞)照明科技有限公司 Motor and overvoltage protection circuit thereof
CN104122512A (en) * 2013-04-28 2014-10-29 深圳市海洋王照明工程有限公司 Constant-current performance testing method and device of LED constant-current source
CN103915822B (en) * 2012-12-31 2016-11-30 海洋王(东莞)照明科技有限公司 A kind of motor and overvoltage crowbar thereof
CN106711959A (en) * 2016-12-22 2017-05-24 上海艺时网络科技有限公司 Control circuit and electronic equipment
CN106711928A (en) * 2017-01-16 2017-05-24 努比亚技术有限公司 Short-circuit protection device, as well as short-circuit protection method and short-circuit protection circuit thereof
CN108108291A (en) * 2017-12-25 2018-06-01 曙光信息产业(北京)有限公司 A kind of trouble-shooter of server
CN108448533A (en) * 2018-03-29 2018-08-24 河南首翔电子有限公司 Overvoltage alarm and overpressure protection circuit
CN109245082A (en) * 2018-10-16 2019-01-18 大连海事大学 Two-way switch circuit that is a kind of anti-reverse and inhibiting power-on surge current

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050041350A1 (en) * 2003-08-22 2005-02-24 Sunonwealth Electric Machine Industry Co., Ltd. Overvoltage protective circuit for a brushless DC motor
CN101330203A (en) * 2008-07-30 2008-12-24 电子科技大学 Current deep constant-current output driving circuit with load short circuit protection function
CN101715263A (en) * 2009-10-20 2010-05-26 海洋王照明科技股份有限公司 LED drive control method and system, and portable LED light-emitting device
CN101800412A (en) * 2010-04-07 2010-08-11 海洋王照明科技股份有限公司 Power protection circuit and LED device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050041350A1 (en) * 2003-08-22 2005-02-24 Sunonwealth Electric Machine Industry Co., Ltd. Overvoltage protective circuit for a brushless DC motor
CN101330203A (en) * 2008-07-30 2008-12-24 电子科技大学 Current deep constant-current output driving circuit with load short circuit protection function
CN101715263A (en) * 2009-10-20 2010-05-26 海洋王照明科技股份有限公司 LED drive control method and system, and portable LED light-emitting device
CN101800412A (en) * 2010-04-07 2010-08-11 海洋王照明科技股份有限公司 Power protection circuit and LED device

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103915822A (en) * 2012-12-31 2014-07-09 海洋王(东莞)照明科技有限公司 Motor and overvoltage protection circuit thereof
CN103915822B (en) * 2012-12-31 2016-11-30 海洋王(东莞)照明科技有限公司 A kind of motor and overvoltage crowbar thereof
CN104122512A (en) * 2013-04-28 2014-10-29 深圳市海洋王照明工程有限公司 Constant-current performance testing method and device of LED constant-current source
CN106711959A (en) * 2016-12-22 2017-05-24 上海艺时网络科技有限公司 Control circuit and electronic equipment
CN106711928A (en) * 2017-01-16 2017-05-24 努比亚技术有限公司 Short-circuit protection device, as well as short-circuit protection method and short-circuit protection circuit thereof
CN108108291A (en) * 2017-12-25 2018-06-01 曙光信息产业(北京)有限公司 A kind of trouble-shooter of server
CN108448533A (en) * 2018-03-29 2018-08-24 河南首翔电子有限公司 Overvoltage alarm and overpressure protection circuit
CN109245082A (en) * 2018-10-16 2019-01-18 大连海事大学 Two-way switch circuit that is a kind of anti-reverse and inhibiting power-on surge current

Also Published As

Publication number Publication date
CN102801137B (en) 2015-10-28

Similar Documents

Publication Publication Date Title
CN102801138B (en) Light-emitting diode (LED) over current protection circuit and light fitting
CN101867168B (en) Power protecting circuit and LED lamp
CN102801137A (en) Light-emitting diode (LED) short circuit protection circuit and light fitting
CN101841149B (en) Power source protection circuit and LED lamp
CN101860021B (en) Circuit for preventing reverse connection of power supply and lamp
CN202373957U (en) Over-voltage and under-voltage protection circuit
CN102780199A (en) Overcurrent protection circuit and lamp
CN102780202A (en) Overvoltage protection circuit and lamp
CN101800412A (en) Power protection circuit and LED device
CN103024973B (en) LED (Light-Emitting Diode) lamp and overcurrent protection circuit thereof
CN103683263A (en) Circuit for preventing reverse plug in of direct current power supply and lamp
CN104111397A (en) Power interruption detection circuit and lamp
CN102780204A (en) Under-voltage protection circuit and lamp
CN103379698A (en) LED constant current drive circuit with short-circuit protection
CN106569015B (en) AC load detection circuit
CN102970791B (en) Light-emitting diode (LED) constant current driving circuit and LED lamp
CN104218551A (en) Lamp surge protection circuit and lamp
CN103683239A (en) Surge protection circuit
CN105578645A (en) Over-current protection method of LED driving power supply
CN103826363B (en) For the hot plug holding circuit of LED luminaire
CN203167382U (en) LED driving circuit and lamp
CN102956110B (en) LED traffic signal lamp and drive circuit thereof
CN101860999A (en) Circuit for preventing reverse connection of power supply, LED lamp circuit and LED lamp
CN202602243U (en) LED (Light-Emitting Diode) illumination power supply protection circuit
CN103683264A (en) Circuit for preventing reverse plug in of direct current power supply and lamp

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant