CN218388016U - Protection device of LED system - Google Patents
Protection device of LED system Download PDFInfo
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- CN218388016U CN218388016U CN202123032289.XU CN202123032289U CN218388016U CN 218388016 U CN218388016 U CN 218388016U CN 202123032289 U CN202123032289 U CN 202123032289U CN 218388016 U CN218388016 U CN 218388016U
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- resistor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model discloses a protection device of LED system belongs to LED system protection technical field, including resistance R1, resistance R1's one end electric connection power is anodal, resistance R1's other end electric connection resistance R2's one end, resistance R3's one end, LED lamp cluster group, resistance R8, resistance R7 and TVS pipe's one end, the first stabilivolt D1's of resistance R2's other end electric connection negative pole and first switch tube Q1's collecting electrode, first stabilivolt D1's first switch tube Q1's of positive pole electric connection projecting pole and ground connection, first switch tube Q1's base electric connection diode D2's negative pole, diode D2's positive pole electric connection resistance R3's the other end through adopting thermistor R1 to restrain the heavy current, adopt TVS tube D3 to restrain high voltage in the twinkling of an eye, after the power supply is removed unusually, but automatic recovery need not artifical the maintenance.
Description
Technical Field
The utility model relates to a LED system protection especially relates to a protection device of LED system, belongs to LED system protection technical field.
Background
At present, LEDs have gradually replaced traditional light sources such as incandescent lamps and become the dominant force of the lighting market.
The LED has the advantages of high luminous efficiency, good color rendering property, energy conservation, environmental protection and the like, but the LED belongs to a semiconductor device and is easily damaged by large current or instant high voltage, so that the protection device of the LED system is designed to optimize the problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a protection device of LED system adopts thermistor R1 to restrain the heavy current, adopts TVS pipe D3 to restrain high voltage in the twinkling of an eye, removes the back when the power supply is unusual, but automatic recovery need not the manual work and maintains.
By monitoring the voltage of the LED lamp string set, when abnormality occurs, the current loop of the LED lamp string set is automatically cut off, and the safe operation of the system is ensured.
The purpose of the utility model can be achieved by adopting the following technical scheme:
a protection device of an LED system comprises a resistor R1, one end of the resistor R1 is electrically connected with the positive electrode of a power supply, the other end of the resistor R1 is electrically connected with one end of a resistor R2, one end of a resistor R3, an LED lamp string group, a resistor R8, a resistor R7 and one end of a TVS tube, the other end of the resistor R2 is electrically connected with the cathode of a first voltage regulator tube D1 and the collector of the first switch tube Q1, the anode of the first voltage regulator tube D1 is electrically connected with the emitter of the first switch tube Q1 and is grounded, the base of the first switch tube Q1 is electrically connected with the cathode of a diode D2, the anode of the diode D2 is electrically connected with the other end of the resistor R3, the other end of the resistor R3 is also connected with the collector of a second switch tube Q2, the emitter of the second switch tube Q2 is grounded, the base of the second switch tube Q2 is electrically connected with the other end of the TVS tube and the emitter of the LED lamp string group, one end of the resistor R5 and the collector of the third switch tube Q3, the other end of the resistor R4 is electrically connected with the emitter of the voltage comparator R6, the emitter of the resistor R4 is electrically connected with the emitter of the collector of the fourth switch tube Q4, the emitter of the resistor R4, the comparator R4 and the emitter of the other end of the resistor R4, and the comparator R4 are electrically connected with the collector of the fourth switch tube Q3, and the collector of the fourth switch tube Q4, and the fourth switch tube Q4.
Preferably, the LED lamp string set includes at least two groups of LED lamps, and a cathode of the LED lamp string set is connected to the resistor R1, an anode of the LED lamp string set is connected to the resistor R5, and the LED lamps are connected in series.
Preferably, the resistor R1 is a positive temperature coefficient thermistor.
Preferably, the TVS tube D3 is a bidirectional TVS tube.
Preferably, the first to fifth switching tubes Q1 to Q5 are NPN type transistors.
Preferably, the voltage comparator U1 is of the type LM358.
The utility model has the advantages of:
the utility model provides a pair of protection device of LED system, (1) the utility model discloses an adopt thermistor R1 to restrain the heavy current, adopt TVS pipe D3 to restrain high voltage in the twinkling of an eye, remove the back when the power supply is unusual, but automatic recovery need not artifical the maintenance.
(2) The utility model discloses a monitoring LED lamp cluster group voltage, when appearing unusual, automatic cutout LED lamp cluster group current loop guarantees the safe operation of system.
Drawings
Fig. 1 is a schematic circuit diagram of a preferred embodiment of a protection device for an LED system according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention clearer and clearer for those skilled in the art, the present invention will be described in further detail with reference to the following embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 1, the protection device for an LED system provided in this embodiment includes a resistor R1, one end of the resistor R1 is electrically connected to a positive electrode of a power supply, the other end of the resistor R1 is electrically connected to one end of a resistor R2, one end of a resistor R3, an LED lamp string group, a resistor R8, a resistor R7, and one end of a TVS, the other end of the resistor R2 is electrically connected to a cathode of a first voltage regulator D1 and a collector of the first switch Q1, an anode of the first voltage regulator D1 is electrically connected to an emitter of the first switch Q1 and is grounded, a base of the first switch Q1 is electrically connected to a cathode of a diode D2, an anode of the diode D2 is electrically connected to the other end of the resistor R3, the other end of the resistor R3 is further connected to a collector of a second switch Q2, an emitter of the second switch Q2 is grounded, a base of the second switch Q2 is electrically connected to the other end of the TVS and the LED lamp string group, one end of the resistor R5 and one end of the third switch Q3, a collector of the resistor R6 is electrically connected to a collector of the comparator Q4, and a collector of the comparator R4 is electrically connected to a collector of the fourth switch Q4, and a base of the comparator R4 is electrically connected to a collector of the comparator Q4, and a collector of the comparator Q4.
When the lamp string is abnormal, the second switch tube Q2 is conducted, the diode D2 is reversely cut off, the first voltage-stabilizing tube D1 works normally and provides bias voltage for the third switch tube Q3 to conduct the third switch tube Q3; when the lamp string is abnormal, the voltage of the negative electrode of the lamp string is lower than the reference voltage provided by the second voltage-stabilizing tube D4, the third pin of the voltage comparator U1 outputs low level, the fifth switch tube Q5 is cut off, the resistor R7 provides bias voltage for the fourth switch tube Q4, the fourth switch tube Q4 is conducted, and the lamp string works normally.
When some lamp bead(s) in the lamp string is/are open-circuited, the negative pole of the lamp string is at a low level, the diode D2 is conducted in the positive direction, the first switch tube Q1 is conducted, the negative pole of the first voltage-regulator tube D1 is at a low level, the third switch tube Q3 is cut off, and the lamp string is not on.
When a certain lamp bead(s) in the lamp string is short-circuited, the voltage of the negative electrode of the lamp string is higher than the reference voltage of the second voltage-regulator tube D4, the third pin of the voltage comparator U1 outputs a high level, the fifth switch tube Q5 is switched on, the fourth switch tube Q4 is switched off, and the lamp string is not on.
When the input current of the power supply is overlarge, the resistance value of the resistor R1 is rapidly increased, so that the increase of the current is limited;
when the power voltage is too high, the voltage at the two ends of the lamp string is clamped in a safe range through the TVS tube D3, so that the lamp string is prevented from being damaged.
In this embodiment, the LED lamp string set includes at least two groups of LED lamps, a cathode of the LED lamp string set is connected to the resistor R1, an anode of the LED lamp string set is connected to the resistor R5, and the LED lamps are connected in series.
In the present embodiment, the resistor R1 is a thermistor with a positive temperature coefficient.
In this embodiment, the TVS tube D3 is a bidirectional TVS tube combination.
In the present embodiment, the first to fifth switching tubes Q1 to Q5 are NPN-type transistors.
In the present embodiment, the voltage comparator U1 is of the type LM358.
The above description is only a further embodiment of the present invention, but the scope of protection of the present invention is not limited thereto, and any person skilled in the art can replace or change the technical solution and the concept of the present invention within the scope of the present invention.
Claims (6)
1. A protection device for an LED system, characterized by: the LED lamp string comprises a resistor R1, one end of the resistor R1 is electrically connected with the positive electrode of a power supply, the other end of the resistor R1 is electrically connected with one end of a resistor R2, one end of a resistor R3, an LED lamp string group, a resistor R8, a resistor R7 and one end of a TVS (transient voltage suppressor), the other end of the resistor R2 is electrically connected with the cathode of a first voltage regulator tube D1 and the collector of the first switch tube Q1, the anode of the first voltage regulator tube D1 is electrically connected with the emitter of the first switch tube Q1 and is grounded, the base of the first switch tube Q1 is electrically connected with the cathode of a diode D2, the anode of the diode D2 is electrically connected with the other end of the resistor R3, the other end of the resistor R3 is also connected with the collector of a second switch tube Q2, the emitter of the second switch tube Q2 is grounded, the base of the second switch tube Q2 is electrically connected with the other end of the TVS tube and the LED lamp string group, one end of the resistor R5 and one end of the collector of the resistor R4 and the collector of the emitter of the fourth switch tube Q4, the base of the voltage comparator R5 is electrically connected with the emitter of the terminal of the voltage comparator R4, the emitter of the other end of the voltage comparator R4 and the emitter of the resistor R4, the emitter of the fourth switch tube Q4 are electrically connected with the emitter of the fourth switch tube Q4, and the emitter of the fourth switch tube Q4, the emitter of the resistor R4, and the emitter of the comparator R4.
2. A protection device for an LED system according to claim 1, characterized in that: the LED lamp string group comprises at least two groups of LED lamps, the cathode of the LED lamp string group is connected with the resistor R1, the anode of the LED lamp string group is connected with the resistor R5, and the LED lamps are connected in series.
3. A protection device for an LED system according to claim 2, wherein: the resistor R1 is a thermistor with a positive temperature coefficient.
4. A protection device for an LED system according to claim 3, wherein: TVS tube D3 is formed by combining bidirectional TVS tubes.
5. A protection device for an LED system according to claim 4, characterized in that: the first to fifth switching transistors Q1 to Q5 are NPN transistors.
6. A protection device for an LED system according to claim 5, characterized in that: the voltage comparator U1 is of the type LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123032289.XU CN218388016U (en) | 2021-11-29 | 2021-11-29 | Protection device of LED system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123032289.XU CN218388016U (en) | 2021-11-29 | 2021-11-29 | Protection device of LED system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218388016U true CN218388016U (en) | 2023-01-24 |
Family
ID=84951941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123032289.XU Active CN218388016U (en) | 2021-11-29 | 2021-11-29 | Protection device of LED system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218388016U (en) |
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2021
- 2021-11-29 CN CN202123032289.XU patent/CN218388016U/en active Active
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