CN220552960U - Vehicle head lamp fault detection circuit and vehicle - Google Patents
Vehicle head lamp fault detection circuit and vehicle Download PDFInfo
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- CN220552960U CN220552960U CN202321722642.3U CN202321722642U CN220552960U CN 220552960 U CN220552960 U CN 220552960U CN 202321722642 U CN202321722642 U CN 202321722642U CN 220552960 U CN220552960 U CN 220552960U
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The utility model discloses a vehicle headlamp fault detection circuit and a vehicle, and relates to the technical field of circuit fault detection, comprising a light-emitting module, a sampling module, a reference module and a detection module; one end of the light-emitting module is connected with the input end of the headlamp, and the other end of the light-emitting module is connected with the output end of the headlamp; the input end of the sampling module is connected with the light-emitting module, the first output end and the second output end of the sampling module are both connected with the detection module, and the sampling module is used for collecting the voltage of the light-emitting module and transmitting the voltage to the detection module; the reference module is used for providing a reference voltage for the detection module; the detection module is used for detecting whether the light-emitting module has faults. Compared with the existing fault detection method, the open-circuit fault and the short-circuit fault of the headlamp can be detected and reported independently, so that fault maintenance is facilitated, detection errors are small, cost is low, and in addition, the type of the headlamp suitable for the detection circuit is wider because the reference voltage signal can be adjusted.
Description
Technical Field
The utility model relates to the technical field of circuit fault detection, in particular to a vehicle headlamp fault detection circuit and a vehicle.
Background
Recently, with the popularization of LED lighting technology, LED lamps are used for lighting in more and more occasions. As small as a family night lamp and as large as a square building, the LED lamp is visible everywhere, and comprises an illumination system for the current vehicle, and the LED lamp is commonly adopted. The headlight is an important component in the vehicle lighting system, and the performance of the headlight is relevant to the driving safety, so that the fault detection of the headlight is also more important.
In a driving circuit of a headlight, a headlight light source failure detection circuit is generally included, and there are two kinds of failures of a headlight light source: open-circuit faults and short-circuit faults. The method for detecting the fault generally includes a current detection method and a voltage detection method. Referring to fig. 1, a schematic circuit diagram of a current detection method is shown. The working current of the headlamp flows through the sampling resistor R1 to obtain a sampling voltage, and then the sampling voltage is input to the sampling end of the MCU to carry out fault judgment. When the lamp is in normal operation, the sampling end of the control chip MCU inputs a normal value, and when a certain lamp bead has an open circuit fault, the sampling end of the MCU cannot acquire the value, so that the lamp is judged to have a fault, and then a level signal is output through the output end to report the fault. Although the detection mode can simply and clearly detect that the headlamp has an open circuit fault, whether the lamp beads have a short circuit or not cannot be detected, loss (sampling resistance) in a circuit can be increased by the detection mode, and sampling errors exist in the MCU control chip. Referring to fig. 2, a schematic circuit diagram of the voltage detection method is shown. When one or more lamp beads have an open circuit fault, the sampling voltage of the MCU sampling end is increased, so that the MCU judges the open circuit fault and reports the fault through an output level signal, when one or more lamp beads have a short circuit fault, the sampling voltage of the MCU sampling end is reduced, and the MCU identifies that the circuit has the short circuit fault and reports the fault through the output level signal. The detection mode reduces the loss in the circuit, and can detect open-circuit faults and short-circuit faults at the same time, but the problems of MCU sampling errors and the defect of high cost still exist.
Accordingly, there is a need for improvement and development in the art.
Disclosure of Invention
The technical problem to be solved by the application is to the defects of the prior art, and the vehicle headlamp fault detection circuit and the vehicle are provided, so that the problems of inaccurate detection and high cost of the existing headlamp fault detection mode are solved.
In a first aspect, an embodiment of the present application provides a vehicle headlamp fault detection circuit, which adopts the following technical scheme:
the vehicle headlamp fault detection circuit is connected between the input end and the output end of the headlamp and comprises a light-emitting module, a sampling module, a reference module and a detection module; wherein,
one end of the light-emitting module is connected with the input end of the headlamp, and the other end of the light-emitting module is connected with the output end of the headlamp;
the input end of the sampling module is connected with the light-emitting module, the first output end and the second output end of the sampling module are both connected with the detection module, and the sampling module is used for collecting the voltage of the light-emitting module and transmitting the voltage to the detection module;
the input end of the reference module is connected with a power supply, the first output end and the second output end of the reference module are both connected with the detection module, and the reference module is used for providing a reference voltage for the detection module;
the first input end of the detection module is connected with the first output end of the sampling module, the second input end of the detection module is connected with the second output end of the sampling module, the third input end of the detection module is connected with the first output end of the reference module, the fourth input end of the detection module is connected with the second output end of the reference module, and the detection module is used for detecting whether the light-emitting module has faults or not.
Through adopting above-mentioned technical scheme, sampling module samples light emitting module's voltage, and when light emitting module took place the open circuit trouble, sampling module's second output voltage risees, and the voltage that inputs to detection module's second input increases, and detection module compares this voltage signal with reference voltage, and the high level is reported open circuit trouble type. When the light-emitting module has short-circuit fault, the output voltage of the first output end of the sampling module is reduced, so that the voltage input to the first input end of the detection module is reduced, the detection module compares the voltage signal with the reference voltage, and the high level is output to report the type of the short-circuit fault.
Therefore, the fault detection of the head lamp is realized, compared with the existing fault detection method, the open-circuit fault and the short-circuit fault of the head lamp can be detected respectively and reported independently, so that fault maintenance is facilitated, the detection error is small, the cost is low, in addition, the reference voltage signal can be adjusted, and the type of the head lamp suitable for the detection circuit is wider, so that the detection circuit has practical value.
Further, the sampling module comprises a first resistor, a second resistor, a third resistor and a fourth resistor, wherein,
one end of the first resistor is connected with the input end of the light emitting module, the first resistor is connected with the second resistor in series, one end of the second resistor, which is far away from the first resistor, is connected with the output end of the light emitting module, and a connection node of the first resistor and the second resistor is used as a first output end of the sampling module and is connected with the first input end of the detection module;
one end of the third resistor is connected with the input end of the light emitting module, the third resistor is connected with the fourth resistor in series, one end of the fourth resistor, which is far away from the third resistor, is connected with the output end of the light emitting module, and a connection node of the third resistor and the fourth resistor is used as a second output end of the sampling module and is connected with the second input end of the detection module.
By adopting the technical scheme, when the LED lamp beads have short-circuit faults, the voltage input into a loop formed by the first resistor and the second resistor is reduced, so that the voltage value output by the first output end of the sampling module is also reduced; when the LED lamp beads have open-circuit faults, the voltage value of a loop formed by the third resistor and the fourth resistor is increased, and then the voltage value output by the second output end of the sampling module is also increased, so that the input voltage of the light-emitting module is sampled.
Further, the reference module includes a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor, wherein,
one end of the fifth resistor is connected with a power supply, the fifth resistor is connected with the sixth resistor in series, one end of the sixth resistor, which is far away from the fifth resistor, is grounded, and a connection node of the fifth resistor and the sixth resistor is used as a first output end of the reference module and is connected with a third input end of the detection module;
one end of the seventh resistor is connected with a power supply, the seventh resistor is connected with the eighth resistor in series, one end of the eighth resistor far away from the seventh resistor is grounded, and a connection node of the seventh resistor and the eighth resistor is used as a second output end of the reference module and is connected with a fourth input end of the detection module.
By adopting the technical scheme, the resistance values of the fifth resistor and the sixth resistor and the resistance values of the seventh resistor and the eighth resistor are adjusted, so that the reference voltages of the first output end and the second output end of the reference module are adjusted, and the artificial setting of the reference voltages is realized.
Further, the detection module comprises a first detection subunit and a second detection subunit, wherein,
the first input end of the first detection subunit is used as the first input end of the detection module and is connected with the first output end of the sampling module; the second input end of the first detection subunit is used as a fourth input end of the detection module and is connected with the second output end of the reference module; the output end of the first detection subunit is used for outputting a first detection signal;
the first input end of the second detection subunit is used as a second input end of the detection module and is connected with the second output end of the sampling module, and the second input end of the second detection subunit is used as a third input end of the detection module and is connected with the first output end of the reference module; the output end of the second detection subunit is used for outputting a second detection signal.
By adopting the technical scheme, the independent detection of the headlamp faults is realized through the two paths of detection subunits, the detection result is more accurate, and the maintenance is more convenient.
Further, the first detection subunit comprises a first operational amplifier, wherein,
the inverting input end of the first operational amplifier is connected with the first output end of the sampling module, and the non-inverting input end of the first operational amplifier is connected with the second output end of the reference module.
By adopting the technical scheme, the operational amplifier is adopted to compare the sampling voltage with the reference voltage, and when the output is high, the fault is judged. When the output of the first operational amplifier is high, the first operational amplifier is reported as a short circuit fault, the open loop gain of the operational amplifier is large, and the detection precision is higher.
Further, the second detection subunit includes a second operational amplifier, where a non-inverting input end of the second operational amplifier is connected to the second output end of the sampling module, and an inverting input end of the second operational amplifier is connected to the first output end of the reference module.
By adopting the technical scheme, when the output of the second operational amplifier is high, the open-circuit fault is reported, the open-loop gain of the operational amplifier is large, and the detection precision is higher.
Further, the light-emitting module comprises a plurality of LED lamp beads, and the LED lamp beads are sequentially connected in series between the input end and the output end of the headlamp.
By adopting the technical scheme, the LED lamp beads are connected in series, so that the LED lamp beads are a common connecting mode for the existing headlamp.
In a second aspect, embodiments of the present application provide a vehicle including a headlamp and a vehicle headlamp detection circuit as described above.
Through adopting above-mentioned technical scheme, realize the detection to the head-light trouble through vehicle head-light detection circuit to the maintenance of head-light is convenient for.
Drawings
Fig. 1 is a schematic circuit diagram of a current detection method provided in the background of the application.
Fig. 2 is a schematic circuit diagram of a voltage detection method provided in the background of the application.
Fig. 3 is a block diagram of a vehicle headlamp fault detection circuit provided in an embodiment of the present application.
Fig. 4 is a schematic diagram of a vehicle headlamp fault detection circuit provided in an embodiment of the present application.
Description of the drawings: 1. a light emitting module; 2. a sampling module; 3. a reference module; 4. a detection module; 41. a first detection subunit; 42. and a second detection subunit.
Detailed Description
The application discloses a vehicle head lamp fault detection circuit and vehicle, in order to make purpose, technical scheme and the effect of this application more clear, the application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
The application discloses a vehicle headlamp fault detection circuit, which is connected between an input end and an output end of a headlamp, and referring to fig. 3, comprises a light emitting module 1, a sampling module 2, a reference module 3 and a detection module 4; wherein,
one end of the light-emitting module 1 is connected with the input end of the headlamp, and the other end of the light-emitting module 1 is connected with the output end of the headlamp. The sampling module 2 comprises an input end and two output ends, the input end of the sampling module 2 is connected with the light-emitting module 1, the first output end and the second output end of the sampling module 2 are both connected with the detection module 4, and the sampling module 2 is used for collecting the output voltage of the light-emitting module 1 and transmitting the voltage signal to the detection module 4. The reference module 3 comprises an input end and two output ends, the input end of the reference module 3 is connected with a power supply, the first output end and the second output end of the reference module 3 are both connected with the detection module 4, and the reference module 3 is used for providing a reference voltage for the detection module 4. The detection module 4 comprises four input ends and two output ends, wherein the first input end of the detection module 4 is connected with the first output end of the sampling module 2, the second input end of the detection module 4 is connected with the second output end of the sampling module 2, the third input end of the detection module 4 is connected with the first output end of the reference module 3, the fourth input end of the detection module 4 is connected with the second output end of the reference module 3, and the detection module 4 is used for detecting whether the light-emitting module 1 has faults or not.
In practical application, the sampling module 2 samples the voltage of the light emitting module 1, when the light emitting module 1 has an open circuit fault, the output voltage of the second output end of the sampling module 2 increases, the voltage input to the second input end of the detecting module 4 increases, the detecting module 4 compares the voltage signal with a reference voltage, and a high level is output to report the open circuit fault type. When the light emitting module 1 has a short circuit fault, the output voltage of the first output end of the sampling module 2 is reduced, so that the voltage input to the first input end of the detection module 4 is reduced, the detection module 4 compares the voltage signal with the reference voltage, and the high level is output to report the type of the short circuit fault.
According to the method, the sampling module 2 is used for collecting the voltage of the light-emitting module 1, the detection module 4 is used for comparing the collected voltage signal with the reference voltage signal to judge faults, and therefore the type of faults in the headlamp is detected according to the level signal output by the output end, and the faults are open-circuit faults or short-circuit faults. Therefore, the fault detection of the head lamp is realized, compared with the existing fault detection method, the open-circuit fault and the short-circuit fault of the head lamp can be detected respectively and reported independently, so that fault maintenance is facilitated, the detection error is small, the cost is low, in addition, the reference voltage signal can be adjusted, and the type of the head lamp suitable for the detection circuit is wider, so that the detection circuit has practical value.
In some embodiments, referring to fig. 4, the light emitting module 1 includes a plurality of LED beads, and the LEDs 1, LED 2..ledn, the plurality of LED beads are sequentially connected in series, if one or more of the LED beads fails in an open circuit, the voltage of the input circuit increases, and if one or more of the LED beads fails in a short circuit, the voltage flowing into the circuit decreases.
In one implementation, referring to fig. 4, the sampling module 2 includes a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4, where one end of the first resistor R1 is connected to an input terminal of the headlamp, the first resistor R1 is connected in series with the second resistor R2, one end of the second resistor R2 remote from the first resistor R1 is connected to an output terminal of the headlamp, and a connection node between the first resistor R1 and the second resistor R2 serves as a first output terminal of the sampling module 2 and is connected to a first input terminal of the detection module 4. One end of the third resistor R3 is connected with the input end of the headlamp, the third resistor R3 is connected with the fourth resistor R4 in series, one end of the fourth resistor R4, which is far away from the third resistor R3, is connected with the output end of the headlamp, and a connection node of the third resistor R3 and the fourth resistor R4 serves as a second output end of the sampling module 2 and is connected with the second input end of the detection module 4. The first output end of the sampling module 2 outputs a first sampling voltage, and the second output end of the sampling module 2 outputs a second sampling voltage.
The first resistor R1 and the second resistor R2 form a first loop of the sampling module 2, the first resistor R1 and the second resistor R2 divide voltage, and when the LED lamp beads are shorted, the voltage flowing into the first loop decreases, so that the voltage signal output through the first output end of the sampling module 2 also decreases. The third resistor R3 and the fourth resistor R4 form a second loop of the sampling module 2, the third resistor R3 and the fourth resistor R4 divide the input voltage, and when the LED lamp beads are broken, the voltage flowing into the second loop increases, so that the voltage signal output through the second output end of the sampling module 2 also increases. In this way, sampling of the voltage signal input to the light emitting module 1 is achieved.
In one implementation, referring to fig. 4, the reference module 3 includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8. One end of the fifth resistor R5 is connected to the power VCC, the fifth resistor R5 is connected in series with the sixth resistor R6, one end of the sixth resistor R6 far from the fifth resistor R5 is grounded, and a connection node of the fifth resistor R5 and the sixth resistor R6 is used as a first output end of the reference module 3 and is connected to a third input end of the detection module 4. One end of the seventh resistor R7 is connected to a power supply, the seventh resistor R7 is connected in series with the eighth resistor R8, one end of the eighth resistor R8, which is far away from the seventh resistor R7, is grounded, and a connection node of the seventh resistor R7 and the eighth resistor R8 serves as a second output end of the reference module 3 and is connected to a fourth input end of the detection module 4. Wherein, the first output end of the reference module 3 outputs a first reference voltage, and the second output end of the reference module 3 outputs a second reference voltage.
In application, the fifth resistor R5 and the sixth resistor R6 form the first loop of the reference module 3, the fifth resistor R5 and the sixth resistor R6 can divide the input power voltage, and by adjusting the resistance values of the fifth resistor R5 and the sixth resistor R6, the value of the output first reference voltage can be set so that the detection module 4 can have different detection references, thereby detecting the headlight types of more different numbers of light beads. Similarly, the seventh resistor R7 and the eighth resistor R8 constitute a second loop of the reference module 3, the seventh resistor R7 and the eighth resistor R8 divide the input voltage, and the value of the output second reference voltage can be set by adjusting the resistance values of the seventh resistor R7 and the eighth resistor R8, thereby realizing the setting of the reference voltage of the input detection module 4.
In one implementation, referring to fig. 3 and 4, the detection module 4 includes a first detection subunit 41 and a second detection subunit 42, where a first input of the first detection subunit 41 is used as a first input of the detection module 4 and is connected to a first output of the sampling module 2; the second input end of the first detection subunit 41 is used as a fourth input end of the detection module 4 and is connected with the second output end of the reference module 3; the output terminal of the first detection subunit 41 is configured to output a first detection signal. The first input end of the second detection subunit 42 is used as the second input end of the detection module 4, connected with the second output end of the sampling module 2, and the second input end of the second detection subunit 42 is used as the third input end of the detection module 4, connected with the first output end of the reference module 3; the output terminal of the second detection subunit 42 is configured to output a second detection signal.
Specifically, the first input terminal of the first detection subunit 41 is connected to the connection node of the first resistor R1 and the second resistor R2 to receive the first sampling voltage; a second input terminal of the first detection subunit 41 is connected to a connection node of the seventh resistor R7 and the eighth resistor R8 to receive the second reference voltage. The first detection subunit 41 compares the first sampling voltage with the second reference voltage to perform fault judgment, and reports the detected fault type through the output terminal. The first input terminal of the second detection subunit 42 is connected to the connection node of the third resistor R3 and the fourth resistor R4 to receive the second sampling voltage; a second input terminal of the second detection subunit 42 is connected to a connection node of the fifth resistor R5 and the sixth resistor R6 to receive the first reference voltage. The second detection subunit 42 thus compares the second sampled voltage with the first reference voltage to perform fault determination, and reports the detected fault type through the output terminal. Therefore, two loops for independently detecting the faults of the head lamps are realized, and the fault types can be independently reported, so that the faults can be conveniently judged and maintained.
Specifically, in some embodiments, referring to fig. 3 and 4, the first detection subunit 41 includes a first operational amplifier U1, the second detection subunit 42 includes a second operational amplifier U2, and the first operational amplifier U1 and the second operational amplifier U2 are packaged within the device IC 1. The inverting input terminal of the first operational amplifier U1 is connected to a connection node of the first resistor R1 and the second resistor R2, the non-inverting input terminal of the first operational amplifier U1 is connected to a connection node of the seventh resistor R7 and the eighth resistor R8, and the output terminal of the first operational amplifier U1 outputs a first detection signal. The noninverting input end of the second operational amplifier U2 is connected with the connecting node of the third resistor R3 and the fourth resistor R4, the inverting input end of the second operational amplifier U2 is connected with the connecting node of the fifth resistor R5 and the sixth resistor R6, and the output end of the second operational amplifier U2 outputs a second detection signal.
In practical application, the values of the first reference voltage and the second reference voltage are adjusted first, so that the outputs of the first operational amplifier U1 and the second operational amplifier U2 are both low level. When the LED lamp beads have short-circuit faults, the voltage value input to the inverting input end of the first operational amplifier U1 is reduced, so that the first detection signal level output by the first operational amplifier U1 is high, and the faults are reported as short-circuit faults. When an open circuit fault occurs to the LED lamp bead, the voltage value input to the non-inverting input end of the second operational amplifier U2 is increased, so that the second detection signal level output by the second operational amplifier U2 is high, and the fault is reported as the open circuit fault. Therefore, two loops for independently detecting the faults of the head lamps are realized, the fault types can be reported independently, the maintenance of the faults is facilitated, the open loop gain of the operational amplifier adopted by the method is large, even small errors can be identified, high level is output, and the precision of circuit detection is improved.
The embodiment of the application also discloses a vehicle, which comprises a headlamp and the vehicle headlamp detection circuit. The fault detection of the head lamp can be realized through the vehicle head lamp detection circuit, so that the head lamp is convenient to maintain.
Compared with the prior art, the application has the following advantages:
1. according to the method, the sampling module 2 is used for collecting the voltage of the light-emitting module 1, the detection module 4 is used for comparing the collected voltage signal with the reference voltage signal to judge faults, and therefore the type of faults in the headlamp is detected according to the output level signal of the output end, and the faults are open-circuit faults or short-circuit faults. Therefore, the fault detection of the head lamp is realized, and compared with the existing fault detection method, the method and the device can respectively detect and report the open-circuit fault and the short-circuit fault of the head lamp so as to facilitate fault maintenance, and have small detection error and low cost.
2. The sampling signal and the reference voltage are compared by the operational amplifier, so that the fault type in the headlamp is known, compared with a control chip, the cost is lower, the open loop gain of the operational amplifier is high, the detection precision is higher, and the detection is more accurate.
3. The output of reference voltage can be adjusted through the resistance value of the adjusting resistor, so that the type of the headlamp applicable to the detection circuit is wider, and the detection circuit has practical value.
It is to be understood that the utility model is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.
Claims (8)
1. The vehicle headlamp fault detection circuit is connected between the input end and the output end of the headlamp and is characterized by comprising a light-emitting module, a sampling module, a reference module and a detection module; wherein,
one end of the light-emitting module is connected with the input end of the headlamp, and the other end of the light-emitting module is connected with the output end of the headlamp;
the input end of the sampling module is connected with the light-emitting module, the first output end and the second output end of the sampling module are both connected with the detection module, and the sampling module is used for collecting the voltage of the light-emitting module and transmitting the voltage to the detection module;
the input end of the reference module is connected with a power supply, the first output end and the second output end of the reference module are both connected with the detection module, and the reference module is used for providing a reference voltage for the detection module;
the first input end of the detection module is connected with the first output end of the sampling module, the second input end of the detection module is connected with the second output end of the sampling module, the third input end of the detection module is connected with the first output end of the reference module, the fourth input end of the detection module is connected with the second output end of the reference module, and the detection module is used for detecting whether the light-emitting module has faults or not.
2. The vehicle headlamp fault detection circuit of claim 1, wherein the sampling module comprises a first resistor, a second resistor, a third resistor, and a fourth resistor, wherein,
one end of the first resistor is connected with the input end of the light emitting module, the first resistor is connected with the second resistor in series, one end of the second resistor, which is far away from the first resistor, is connected with the output end of the light emitting module, and a connection node of the first resistor and the second resistor is used as a first output end of the sampling module and is connected with the first input end of the detection module;
one end of the third resistor is connected with the input end of the light emitting module, the third resistor is connected with the fourth resistor in series, one end of the fourth resistor, which is far away from the third resistor, is connected with the output end of the light emitting module, and a connection node of the third resistor and the fourth resistor is used as a second output end of the sampling module and is connected with the second input end of the detection module.
3. The vehicle headlamp fault detection circuit of claim 1, wherein the reference module comprises a fifth resistor, a sixth resistor, a seventh resistor, and an eighth resistor, wherein,
one end of the fifth resistor is connected with a power supply, the fifth resistor is connected with the sixth resistor in series, one end of the sixth resistor, which is far away from the fifth resistor, is grounded, and a connection node of the fifth resistor and the sixth resistor is used as a first output end of the reference module and is connected with a third input end of the detection module;
one end of the seventh resistor is connected with a power supply, the seventh resistor is connected with the eighth resistor in series, one end of the eighth resistor far away from the seventh resistor is grounded, and a connection node of the seventh resistor and the eighth resistor is used as a second output end of the reference module and is connected with a fourth input end of the detection module.
4. The vehicle headlamp fault detection circuit of claim 1, wherein the detection module comprises a first detection subunit and a second detection subunit, wherein,
the first input end of the first detection subunit is used as the first input end of the detection module and is connected with the first output end of the sampling module; the second input end of the first detection subunit is used as a fourth input end of the detection module and is connected with the second output end of the reference module; the output end of the first detection subunit is used for outputting a first detection signal;
the first input end of the second detection subunit is used as a second input end of the detection module and is connected with the second output end of the sampling module, and the second input end of the second detection subunit is used as a third input end of the detection module and is connected with the first output end of the reference module; the output end of the second detection subunit is used for outputting a second detection signal.
5. The vehicle headlamp fault detection circuit of claim 4, wherein the first detection subunit comprises a first operational amplifier, wherein,
the inverting input end of the first operational amplifier is connected with the first output end of the sampling module, and the non-inverting input end of the first operational amplifier is connected with the second output end of the reference module.
6. The vehicle headlamp fault detection circuit of claim 4, wherein the second detection subunit comprises a second operational amplifier, wherein,
the non-inverting input end of the second operational amplifier is connected with the second output end of the sampling module, and the inverting input end of the second operational amplifier is connected with the first output end of the reference module.
7. The vehicle headlamp fault detection circuit of claim 1, wherein the light emitting module comprises a plurality of LED beads, the plurality of LED beads being serially connected in sequence between an input and an output of the headlamp.
8. A vehicle characterized by comprising a headlight and a vehicle headlight detection circuit as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321722642.3U CN220552960U (en) | 2023-07-03 | 2023-07-03 | Vehicle head lamp fault detection circuit and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321722642.3U CN220552960U (en) | 2023-07-03 | 2023-07-03 | Vehicle head lamp fault detection circuit and vehicle |
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| CN220552960U true CN220552960U (en) | 2024-03-01 |
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| CN202321722642.3U Active CN220552960U (en) | 2023-07-03 | 2023-07-03 | Vehicle head lamp fault detection circuit and vehicle |
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2023
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