CN220156691U - Car light fault diagnosis feedback circuit - Google Patents
Car light fault diagnosis feedback circuit Download PDFInfo
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- CN220156691U CN220156691U CN202321618827.XU CN202321618827U CN220156691U CN 220156691 U CN220156691 U CN 220156691U CN 202321618827 U CN202321618827 U CN 202321618827U CN 220156691 U CN220156691 U CN 220156691U
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 24
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000006378 damage Effects 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 2
- 230000008832 photodamage Effects 0.000 description 2
- 238000000034 method Methods 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
- 230000001960 triggered effect Effects 0.000 description 1
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Abstract
The utility model provides a car lamp fault diagnosis feedback circuit which comprises a plurality of LED power supply circuits connected in parallel, wherein each LED power supply circuit is connected in series with a triode constant current circuit for monitoring whether a car lamp is in fault or not, a diagnosis feedback circuit is connected in series between the output end of the triode constant current circuit and a main control MCU, and the diagnosis feedback circuit is used for stably transmitting monitoring signals. The utility model accurately feeds back the damage condition of the car lamp, reduces the risk of false feedback caused by low voltage or low temperature environment, and reduces the probability of false triggering.
Description
Technical Field
The utility model relates to the technical field of automobile lamp damage detection, in particular to an automobile lamp fault diagnosis feedback circuit.
Background
In the car lamp circuit, including the car lamp of different functions, like car headlight, left direction lamp, right direction lamp etc. in order to avoid single lamp damage to influence other car lamps normal use, the car lamp of different functions is parallelly connected in order to carry out the independent power supply.
In the prior art, through concatenating the triode on the corresponding car light circuit of different functions to make the collecting electrode and the master control electricity of triode be connected, the collecting electrode voltage is 0 after the car light damages, in order to feed back the signal to the master control. Because the voltage at the collector position can be changed along with the input voltage or the car lamp voltage, when the input voltage is reduced or the car lamp voltage is increased, the voltage at the collector position of the triode can be reduced, and when the voltage is lower than a detection threshold value, the false feedback condition can occur.
Disclosure of Invention
In view of the above, the utility model aims to provide a feedback circuit for diagnosing the fault of the car lamp, which can accurately feed back the damage condition of the car lamp and reduce the probability of false triggering.
In order to solve the technical problems, the utility model adopts the following technical scheme:
the utility model provides a car light fault diagnosis feedback circuit, includes a plurality of parallelly connected LED power supply circuit, every LED power supply circuit has all concatenated triode constant current circuit that is used for monitoring whether the car light is trouble, it has diagnosis feedback circuit to have in series between triode constant current circuit's the output and the main control MCU, diagnosis feedback circuit is used for stable transmission monitoring signal.
Further, the LED power supply circuit comprises a car lamp, the input end of the car lamp is electrically connected with the power supply port Vin, and the output end of the car lamp is electrically connected with the earth electrode;
the triode constant current circuit comprises a triode T3 and a triode T5, the triode T3 is connected with the car lamp in series, and the base electrode of the triode T5 is respectively and electrically connected with the collector electrode and the emitter electrode of the triode T3, and the triode T5 is conducted by conducting the triode T3.
Further, the emitters of the triode T3 and the triode T5 are electrically connected with the port Vin, and the collector of the triode T3 is electrically connected with the input end of the car lamp.
Further, the diagnosis feedback circuit comprises a MOS tube T1, a grid electrode of the MOS tube T1 is electrically connected with a collector electrode of a triode T5, a diode ZD1, a capacitor C16 and a resistor R8 are respectively connected in series between the grid electrode and the drain electrode of the MOS tube T1, and a diode D1 is connected in series between a source electrode of the MOS tube T1 and the main control MCU.
Further, a diode ZD6 and a resistor R18 are respectively connected in series between the port Vin and the ground, and the resistor R18 is connected in parallel with a resistor R1.
The utility model has the advantages and positive effects that:
through setting up triode constant current circuit, concatenate triode constant current circuit on LED power supply circuit, be provided with the car light in the LED power supply circuit, port Vin power supply voltage is low or should ambient temperature be low lead to car light both ends voltage too high, as long as the car light can normally switch on, switch on the voltage between triode T3's collecting electrode and the projecting pole electricity and keep about 0.7V, monitor signal through triode T5 output is stable, with the realization accurate car light damage condition of feeding back, reduce low voltage or low temperature environment and cause the mistake feedback risk, reduce the probability that the mistake triggered appears.
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 a block diagram of the overall circuit connections of a lamp failure diagnosis feedback circuit of the present utility model;
FIG. 2 is a circuit diagram showing the connection between an LED power supply circuit and a triode constant current circuit in a car lamp fault diagnosis feedback circuit;
FIG. 3 is a circuit diagram of a connection of a lamp fault diagnosis feedback circuit of the present utility model comprising an LED power supply circuit, a triode constant current circuit and a conventional monitoring circuit;
fig. 4 is a circuit diagram showing the connection of a diagnosis feedback circuit of a lamp failure diagnosis feedback 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.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
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 a car lamp fault diagnosis feedback circuit, as shown in fig. 1 and 2, wherein the system comprises an LED power supply circuit for supplying power to a car lamp, and a triode constant current circuit is connected in series on the LED power supply circuit for accurately detecting whether the car lamp works normally. The output end of the triode constant current circuit is electrically connected with a diagnosis feedback circuit and is used for transmitting detection signals of the triode constant current circuit to a main control MCU, and the main control MCU gives logic feedback according to the received detection signals.
In order to independently supply power to different types of lamps, a plurality of LED power supply circuits are connected in parallel, and the single LED power supply circuit comprises a lamp (a lamp LED1 and a lamp LED4 which are connected in series), wherein the input end of the lamp is electrically connected with a port Vin, and a resistor R34, a resistor R35 and a resistor R36 are respectively connected in series between the output end of the lamp and a ground electrode.
A diode ZD6 and a resistor R18 are respectively connected in series between the port Vin and the ground electrode, and the resistor R18 is connected in parallel with a resistor R1 for improving the stability of the power supply voltage of the port Vin.
And a triode constant current circuit is connected in series between the input end of the car lamp and the port Vin, and is used for detecting whether the car lamp is normally conducted or not and is not influenced by power supply voltage and low temperature. The triode constant current circuit comprises a triode T3 and a triode T5, wherein the base electrode of the triode T3 is electrically connected with the port Vin, and the collector electrode of the triode T3 is electrically connected with the input end of the car lamp. The base electrode of the triode T5 is respectively and electrically connected with the collector electrode and the emitter electrode of the triode T3, the port Vin is electrically connected with the emitter electrode of the triode T5, and the collector electrode of the triode T5 is electrically connected with the input end of the diagnosis feedback circuit.
As shown in fig. 3, the vehicle lamp is connected in series with a triode Q6, the collector of the triode Q6 is electrically connected with the output end of the vehicle lamp, and the emitter of the triode Q6 is electrically connected with the input ends of a resistor R34, a resistor R35 and a resistor R36. Triode Q6 switches on, and car light normal operating is through monitoring triode Q6 collecting electrode voltage to judge the behavior of car light.
As shown in fig. 4, the diagnostic feedback circuit includes a MOS transistor T1, a gate of the MOS transistor T1 is electrically connected to a collector of the triode T5 through a resistor R5, a diode ZD1, a capacitor C16 and a resistor R8 are respectively connected in series between a drain and the gate of the MOS transistor T1, a source of the MOS transistor T1 is electrically connected to a port DC5V, a diode D1 is connected in series between a source of the MOS transistor T1 and a port FB, and the port FB is a port for receiving signals by the MCU. And feeding back according to the level of the received signal.
The working principle and working process of the utility model are as follows:
when the car lamp works normally, the port Vin supplies power normally, the triode T3 is conducted, the voltage at the two ends of the collector and the emitter is fixed at about 0.7V (Vbe approximately 0.7V) after the triode is conducted, the triode T5 is conducted, the voltage of 0.7V is divided by the resistor R5 and the resistor R8, the MOS tube T1 is conducted after the capacitor C16 is stabilized, and the source electrode of the MOS tube T1 transmits signals to the main control MCU through the diode D1.
When the lamp is damaged, the transistor T3 cannot be turned on, and the transistor T5 and the MOS transistor T1 are both in the off state, and the input terminal of the diode D1 is in the off state due to insufficient voltage.
Even if the port Vin supplies power at low voltage or the voltage of the car lamp is reduced because of low-voltage environment, as long as the car lamp is damaged, current can normally flow, and the voltage at the two ends of the collector and the emitter of the triode T3 is kept at about 0.7V, so that the accuracy of fault monitoring is effectively ensured.
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 (5)
1. The utility model provides a car light fault diagnosis feedback circuit, its characterized in that includes a plurality of parallelly connected LED power supply circuit, every LED power supply circuit has all concatenated triode constant current circuit that is used for monitoring whether the car light is trouble, it has diagnosis feedback circuit to string between triode constant current circuit's the output and the main control MCU, diagnosis feedback circuit is used for stable transmission monitoring signal.
2. The lamp fault diagnosis feedback circuit according to claim 1, wherein the LED power supply circuit comprises a lamp, an input end of the lamp is electrically connected with the power supply port Vin, and an output end of the lamp is electrically connected with a ground electrode;
the triode constant current circuit comprises a triode T3 and a triode T5, the triode T3 is connected with the car lamp in series, and the base electrode of the triode T5 is respectively and electrically connected with the collector electrode and the emitter electrode of the triode T3, and the triode T5 is conducted by conducting the triode T3.
3. The feedback circuit for diagnosing a vehicle lamp fault according to claim 2, wherein the emitters of the triode T3 and the triode T5 are electrically connected to the port Vin, and the collector of the triode T3 is electrically connected to the input terminal of the vehicle lamp.
4. The car light fault diagnosis feedback circuit according to claim 1, wherein the diagnosis feedback circuit comprises a MOS tube T1, a gate of the MOS tube T1 is electrically connected with a collector of a triode T5, a diode ZD1, a capacitor C16 and a resistor R8 are respectively connected in series between the gate and the drain of the MOS tube T1, and a diode D1 is connected in series between the source of the MOS tube T1 and the main control MCU.
5. The feedback circuit for diagnosing the vehicle lamp fault according to claim 2, wherein a diode ZD6 and a resistor R18 are respectively connected in series between the port Vin and the ground, and the resistor R18 is connected in parallel with a resistor R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321618827.XU CN220156691U (en) | 2023-06-25 | 2023-06-25 | Car light fault diagnosis feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321618827.XU CN220156691U (en) | 2023-06-25 | 2023-06-25 | Car light fault diagnosis feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220156691U true CN220156691U (en) | 2023-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321618827.XU Active CN220156691U (en) | 2023-06-25 | 2023-06-25 | Car light fault diagnosis feedback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220156691U (en) |
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2023
- 2023-06-25 CN CN202321618827.XU patent/CN220156691U/en active Active
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