CN212910144U - Protection circuit for LED illumination - Google Patents
Protection circuit for LED illumination Download PDFInfo
- Publication number
- CN212910144U CN212910144U CN202022154183.6U CN202022154183U CN212910144U CN 212910144 U CN212910144 U CN 212910144U CN 202022154183 U CN202022154183 U CN 202022154183U CN 212910144 U CN212910144 U CN 212910144U
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- Prior art keywords
- self
- unit
- zener diode
- led
- led lighting
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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]
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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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a protection circuit for LED illumination, including the LED lighting unit to and be used for carrying out the power rectification unit that supplies power to the LED lighting unit, be connected with the protection unit between LED lighting unit and the power rectification unit, the protection unit includes self-recovery fuse R1 and zener diode D5, the highest point that is close to heat source district city is installed to the self-recovery fuse, the one end of self-recovery fuse R1 links to each other with the output of power rectification unit, and the output of self-recovery fuse R1 links to each other with the input of LED lighting unit after linking to each other with zener diode D5's negative pole, and zener diode D5's anodal ground connection. The utility model discloses increase self-resuming fuse and zener diode as the protection unit, in the twinkling of an eye, zener diode switches on the shortest time in the voltage is guaranteed to the heavy current, and self-resuming fuse becomes the protected state by normal work, and rear end output voltage reduces with the electric current sharply, guarantees that back stage circuit can not work.
Description
Technical Field
The utility model relates to a protection circuit for LED illumination is applicable to LED lighting circuit technical field.
Background
Among the circuit structure in the present LED illumination, LED generates heat very greatly, and LED lamp pearl very easily damages under high temperature, and if other abnormalities appear in addition, the product causes the increase of electric current, perhaps the power is unstable, and voltage fluctuation changes greatly, can lead to LED lamp pearl rapid heating up, just burns out LED lamp pearl in the short time.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a protection circuit for LED illumination, because circuit current is unusual in the illumination of protection LED that can be limited, the voltage fluctuation to and the lamp pearl that the reason of high temperature leads to is ageing and damaging.
Realize the utility model discloses the technical solution of purpose does: the utility model provides a protection circuit for LED illumination, includes the LED lighting unit to and be used for carrying out the power rectifier unit of power supply to the LED lighting unit, its characterized in that, be connected with the protection unit between LED lighting unit and the power rectifier unit, the protection unit includes self recovery fuse R1 and zener diode D5, the highest point that is close to heat source district city is installed to the self recovery fuse, the one end of self recovery fuse R1 links to each other with the output of power rectifier unit, and the output of self recovery fuse R1 links to each other with the input of LED lighting unit after with zener diode D5's negative pole links to each other, and zener diode D5's positive ground.
Further, the model of the self-recovery fuse R1 is TRM 250V.
Further, the voltage of the zener diode D5 is 5V to 60V.
Furthermore, the LED illumination unit is composed of a plurality of LED lamps, at least two LED lamp strings are formed after a plurality of LED diodes are connected in parallel, and the LED lamp strings are connected in series.
Compared with the prior art, the utility model, it is showing the advantage and lies in: the self-recovery fuse and the Zener diode are added as protection units and are connected between the LED lighting unit and the power supply rectifying unit, when a power supply has higher voltage, the Zener diode is in reverse saturation conduction, at the moment, the Zener diode is equivalent to short circuit conduction to the ground, the large current flows through the self-recovery fuse at the same time, the large current ensures that the voltage is overhigh, the self-recovery fuse is changed into a protection state from normal work within the shortest conduction time of the Zener diode, the rear-end output voltage and the rear-end output current are reduced sharply, the rear-stage circuit is ensured not to work, and therefore the purpose of protecting a circuit, protecting lamp beads and other devices from being damaged is achieved; the self-recovery fuse is arranged at the highest position close to the heat source, so that over-temperature protection is realized, and over-current, over-voltage and over-temperature protection of the whole lighting circuit is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments of the present invention or the prior art are briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
With reference to fig. 1, a protection circuit for LED lighting includes an LED lighting unit, a power supply rectification unit and a protection unit, one end of the protection unit is connected to an input end of the LED lighting unit, the other end of the protection unit is connected to an output end of the power supply rectification unit, the LED lighting unit is powered by the power supply rectification unit, wherein the LED lighting unit includes 12 LED lamps, and each 3 LED diodes are connected in parallel to form 4 LED lamp strings, the 4 LED lamp strings are connected in series to form an LED lighting unit, and the power supply rectification unit 2 includes diodes D1-D4.
The protection unit comprises a self-recovery fuse R1 and a Zener diode D5, the voltage of the Zener diode D5 is 25V, the voltage selection is related to the power input and the number of serially connected rear-end LEDs, the self-recovery fuse is installed at the highest position close to a heat source area city, one end of the self-recovery fuse R1 is connected with the output end of the power supply rectifying unit, the model of the self-recovery fuse R1 is TRM250V, the SMD series is mounted, the output end of the self-recovery fuse R1 is connected with the negative electrode of the Zener diode D5 and then connected with the input end of the LED lighting unit, and the positive electrode of the Zener diode D5 is grounded.
When a power supply has higher voltage, the Zener diode D5 is in reverse saturation conduction, at the moment, the Zener diode D5 is equivalent to short-circuit conduction to the ground, so that the current is very large, the large current flows through the self-recovery fuse R1 at the same time, the high current ensures that the voltage is overhigh at the moment, the Zener diode D5 is conducted within the shortest time, the self-recovery fuse R1 is changed into a protection state from normal operation, the output voltage and the current at the rear end are reduced sharply, the rear-stage LED lighting unit cannot work, so that the LED lamp bead and other devices are protected from being damaged, in order to reflect better protection of the LED lamp bead under the condition of high temperature, when the self-recovery fuse R1 is installed, the overtemperature protection is realized near the position with the highest heat source, and due to the overcurrent, overvoltage and overtemperature protection measures, other devices are arranged in the whole lighting circuit, or under the condition of overload and over-temperature, the self-recovery fuse R1 and the Zener diode can realize the function of rapid overcurrent, over-temperature and overvoltage protection.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a protection circuit for LED illumination, includes the LED lighting unit to and be used for carrying out the power rectifier unit of power supply to the LED lighting unit, its characterized in that, be connected with the protection unit between LED lighting unit and the power rectifier unit, the protection unit includes self recovery fuse R1 and zener diode D5, the highest point that is close to heat source district city is installed to the self recovery fuse, the one end of self recovery fuse R1 links to each other with the output of power rectifier unit, and the output of self recovery fuse R1 links to each other with the input of LED lighting unit after with zener diode D5's negative pole links to each other, and zener diode D5's positive ground.
2. The protection circuit of claim 1, wherein the self-healing fuse R1 is of the type TRM 250V.
3. The protection circuit for LED illumination of claim 1, wherein the voltage of the Zener diode D5 is 5V-60V.
4. The protection circuit of claim 1, wherein the LED lighting unit comprises a plurality of LED lamps, and a plurality of LED diodes are connected in parallel to form at least two LED strings, and a plurality of the LED strings are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022154183.6U CN212910144U (en) | 2020-09-27 | 2020-09-27 | Protection circuit for LED illumination |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022154183.6U CN212910144U (en) | 2020-09-27 | 2020-09-27 | Protection circuit for LED illumination |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212910144U true CN212910144U (en) | 2021-04-06 |
Family
ID=75259670
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022154183.6U Active CN212910144U (en) | 2020-09-27 | 2020-09-27 | Protection circuit for LED illumination |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212910144U (en) |
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2020
- 2020-09-27 CN CN202022154183.6U patent/CN212910144U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |