CN220776120U - LED over-temperature protection circuit for automobile lamp - Google Patents
LED over-temperature protection circuit for automobile lamp Download PDFInfo
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- CN220776120U CN220776120U CN202322399840.7U CN202322399840U CN220776120U CN 220776120 U CN220776120 U CN 220776120U CN 202322399840 U CN202322399840 U CN 202322399840U CN 220776120 U CN220776120 U CN 220776120U
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- 239000003990 capacitor Substances 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
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Abstract
The utility model provides an LED over-temperature protection circuit for an automobile lamp, which comprises an indicator lamp circuit integrated on a lamp panel, wherein the indicator lamp circuit is electrically connected with a power module through an anti-reflection circuit, a control end of the anti-reflection circuit is electrically connected with a control module, and the control module circuit is connected with a temperature sampling circuit for detecting the lamp panel; the indicator light circuit comprises a plurality of car light groups, the car light groups comprise a Light Emitting Diode (LED) 1 and a Light Emitting Diode (LED) 12 which are connected in series, and a capacitor C5 is connected between the input end of the diode (LED) 1 and the output end of the Light Emitting Diode (LED) 12 in series. The utility model can reduce the power of the car lamp when the temperature of the car lamp is too high, and improve the stability of the temperature of the lamp panel so as to prolong the service life of the car lamp.
Description
Technical Field
The utility model relates to the technical field of power supply of car lamps, in particular to an LED over-temperature protection circuit of an automobile lamp.
Background
The types of automobile lamps include an illuminating lamp, an ornamental lamp and an indicating lamp, and the indicating lamp comprises double flash lamps. The double-flashing lamp is used when an accident or an emergency occurs to the vehicle so as to remind surrounding vehicles and personnel, and in order to ensure the reminding effect of the double-flashing lamp, the double-flashing lamp operates at high power, and the double-flashing lamp is easy to overheat when the impression time is too long, so that the lamp is burnt or the service life of the lamp is influenced.
Disclosure of Invention
In view of the above, the present utility model aims to provide an over-temperature protection circuit for an LED of an automotive lamp, which can reduce the power of the lamp and prolong the life of the lamp when the temperature of the lamp is too high.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the LED over-temperature protection circuit for the automobile lamp comprises an indicator lamp circuit integrated on a lamp panel, wherein the indicator lamp circuit is electrically connected with a power supply module through an anti-reflection circuit, a control end of the anti-reflection circuit is electrically connected with a control module, and the control module circuit is connected with a temperature sampling circuit for detecting the lamp panel;
the indicator light circuit comprises a plurality of car light groups, the car light groups comprise a Light Emitting Diode (LED) 1 and a Light Emitting Diode (LED) 12 which are connected in series, and a capacitor C5 is connected between the input end of the diode (LED) 1 and the output end of the Light Emitting Diode (LED) 12 in series.
Further, the input end of the diode LED1 is electrically connected with the control module so as to control the current flowing on the vehicle lamp set;
the control module comprises a main control chip U2 and a driving chip U1, wherein the main control chip U2 is in data intercommunication with the driving chip U1, and an LED port of the driving chip U1 is electrically connected with an input end of the diode LED 1.
Further, the anti-reflection circuit comprises a MOS tube T1, wherein a source electrode of the MOS tube T1 is electrically connected with the power supply module. The drain electrode of the MOS tube T1 is electrically connected with the drain electrode of the MOS tube T2, and the source electrode of the MOS tube T2 is electrically connected with the output end of the light-emitting diode LED 12;
the grid electrodes of the MOS tube T1 and the MOS tube T2 are electrically connected with the collector electrode of the triode T5, and the base electrode of the triode T5 is electrically connected with the LED port of the driving chip U1.
Further, a capacitor C8 and a bidirectional diode D1 are respectively connected in series between the source electrode and the ground electrode of the MOS transistor T1.
Further, the NTC port of the main control chip U2 is electrically connected to a temperature sampling circuit, where the temperature sampling circuit includes a temperature sensing resistor R8, and the temperature sensing resistor R8 is connected in parallel to a capacitor C11.
Further, the indicator light circuit is a double-flash light.
The utility model has the advantages and positive effects that:
through setting up temperature sampling circuit, monitor the temperature of lamp plate constantly, when the temperature of lamp plate is too high, the circulation current on the control module adjustment pilot lamp circuit improves the stability of lamp plate temperature, prolongs the life of car light.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
FIG. 1 is an overall system diagram of an automotive lamp LED over-temperature protection circuit of the present utility model;
fig. 2 is a circuit diagram of a main control chip U2 of an LED over-temperature protection circuit for an automobile lamp;
FIG. 3 is a circuit diagram of a driving chip U1 of the LED over-temperature protection circuit for the automobile lamp;
FIG. 4 is a circuit diagram of an indicator light of an LED over-temperature protection circuit for an automotive lamp according to the present utility model;
FIG. 5 is a circuit diagram of an anti-reflection circuit of an LED over-temperature protection circuit for an automotive lamp of the present utility model;
fig. 6 is a circuit diagram of a temperature sampling circuit of an automobile lamp LED over-temperature protection circuit of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used herein in the description of the utility model is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
The utility model provides an LED over-temperature protection circuit for an automobile lamp, which is shown in figure 1 and comprises a power module for providing electric energy, wherein the power module is connected with an indicator lamp circuit through an anti-reflection circuit so as to provide electric energy for the indicator lamp circuit. The control end of the anti-reflection circuit is in data communication with the control module, and the control module is used for controlling the anti-reflection circuit to conduct and controlling the circulating current of the indicator light circuit so as to adjust the brightness of the indicator light circuit.
As shown in fig. 2 and 3, the control module includes a main control chip U2 and a driving chip U1, where the main control chip U2 is in data intercommunication with the driving chip U1 through an RX port and a TX port, and the driving chip U1 is used for controlling the operation of the indicator light circuit. As shown in fig. 4, the indicator light circuit includes a plurality of lamp groups connected in parallel, and takes a structure of one lamp group as an example: the car light group comprises a light emitting diode (LED 1) and a light emitting diode (LED 12) which are connected in series, a capacitor (C5) is connected in series between the input end of the diode (LED 1) and the output end of the light emitting diode (LED 12), the output end of the light emitting diode (LED 12) is electrically connected with an LED port of a driving chip (U1), and the driving chip (U1) is used for controlling the car light group to operate.
As shown in fig. 5, the anti-reflection circuit includes a MOS transistor T1, a source electrode of the MOS transistor T1 is electrically connected to the power module, a drain electrode of the MOS transistor T1 is electrically connected to a drain electrode of the MOS transistor T2, and a source electrode of the MOS transistor T2 is electrically connected to an output end of the light emitting diode LED 12. The grid electrodes of the MOS tube T1 and the MOS tube T2 are electrically connected with the collector electrode of the triode T5, the emitter electrode of the triode T5 is electrically connected with the ground electrode, a resistor R23 is connected between the emitter electrode and the base electrode of the triode T5 in series, and the base electrode of the triode T5 is electrically connected with the LED port of the driving chip U1.
When the voltage of the LED port of the driving chip U1 is pulled high, the triode T5 in the anti-reflection circuit is conducted, the grid voltages of the MOS tube T1 and the MOS tube T2 are pulled high, the MOS tube T1 and the MOS tube T2 are conducted, and the capacitor C5 is charged. When the voltage of the LED port of the driving chip U1 is pulled down, the anti-reverse circuit is disconnected, the capacitor C5 is discharged, and the driving chip U1 adjusts the output current of the capacitor C5 by adjusting the voltage of the LED port, so as to control the brightness of the car lamp.
In order to improve the stability of the anti-reflection circuit for providing electric energy, a capacitor C8 and a bidirectional diode D1 are respectively connected in series between the source electrode and the ground electrode of the MOS tube T1.
As shown in fig. 6, the indicator light circuit is integrally mounted on the light board, the main control chip U2 is electrically connected with the temperature sampling circuit through the NTC port, the temperature sampling circuit includes a temperature sensing resistor R8, the temperature sensing resistor R8 is connected with a capacitor C11 in parallel, when the temperature of the light board changes, the resistance value of the temperature sensing resistor R8 changes, the voltage of the NTC port is changed, and the main control chip U2 receives the temperature signal of the light board.
The main control chip U2 adjusts the voltage of the LED port of the driving chip U1 according to the temperature signal, adjusts the circulating current on the indicator lamp circuit, reduces the LED power when the LED temperature is too high, and prolongs the service life of the LED.
The foregoing describes the embodiments of the present utility model in detail, but the description is only a preferred embodiment of the present utility model and should not be construed as limiting the scope of the utility model. All equivalent changes and modifications within the scope of the present utility model are intended to be covered by this patent.
Claims (6)
1. The LED overtemperature protection circuit for the automobile lamp is characterized by comprising an indicator lamp circuit integrated on a lamp panel, wherein the indicator lamp circuit is electrically connected with a power module through an anti-reflection circuit, a control end of the anti-reflection circuit is electrically connected with a control module, and the control module is respectively connected with a temperature sampling circuit and an indicator lamp circuit for detecting the lamp panel;
the indicator light circuit comprises a plurality of car light groups, the car light groups comprise a Light Emitting Diode (LED) 1 and a Light Emitting Diode (LED) 12 which are connected in series, and a capacitor C5 is connected between the input end of the diode (LED) 1 and the output end of the Light Emitting Diode (LED) 12 in series.
2. The automobile lamp LED over-temperature protection circuit according to claim 1, wherein the input end of the diode LED1 is electrically connected with the control module so as to control the circulating current on the automobile lamp set;
the control module comprises a main control chip U2 and a driving chip U1, wherein the main control chip U2 is in data intercommunication with the driving chip U1, and an LED port of the driving chip U1 is electrically connected with an input end of the diode LED 1.
3. The automobile lamp LED over-temperature protection circuit according to claim 1, wherein the anti-reflection circuit comprises a MOS tube T1, a source electrode of the MOS tube T1 is electrically connected with a power module, a drain electrode of the MOS tube T1 is electrically connected with a drain electrode of a MOS tube T2, and a source electrode of the MOS tube T2 is electrically connected with an output end of a light-emitting diode LED 12;
the grid electrodes of the MOS tube T1 and the MOS tube T2 are electrically connected with the collector electrode of the triode T5, and the base electrode of the triode T5 is electrically connected with the LED port of the driving chip U1.
4. The LED over-temperature protection circuit for the automobile lamp according to claim 3, wherein a capacitor C8 and a bidirectional diode D1 are respectively connected in series between the source electrode and the ground electrode of the MOS tube T1.
5. The automobile lamp LED over-temperature protection circuit according to claim 2, wherein the NTC port of the main control chip U2 is electrically connected with a temperature sampling circuit, the temperature sampling circuit comprises a temperature sensing resistor R8, and the temperature sensing resistor R8 is connected with a capacitor C11 in parallel.
6. The automotive lamp LED over-temperature protection circuit of claim 1, wherein the indicator light circuit is a double flash light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322399840.7U CN220776120U (en) | 2023-09-04 | 2023-09-04 | LED over-temperature protection circuit for automobile lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322399840.7U CN220776120U (en) | 2023-09-04 | 2023-09-04 | LED over-temperature protection circuit for automobile lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220776120U true CN220776120U (en) | 2024-04-12 |
Family
ID=90600355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322399840.7U Active CN220776120U (en) | 2023-09-04 | 2023-09-04 | LED over-temperature protection circuit for automobile lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220776120U (en) |
-
2023
- 2023-09-04 CN CN202322399840.7U patent/CN220776120U/en active Active
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