CN105093090A - LED fault detection apparatus and method - Google Patents
LED fault detection apparatus and method Download PDFInfo
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- CN105093090A CN105093090A CN201510539984.5A CN201510539984A CN105093090A CN 105093090 A CN105093090 A CN 105093090A CN 201510539984 A CN201510539984 A CN 201510539984A CN 105093090 A CN105093090 A CN 105093090A
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Abstract
The invention discloses an LED fault detection apparatus. The LED fault detection apparatus comprises at least one light guide pipe, at least one photoelectric switching circuit, a gating circuit, an electric signal detection circuit and a control circuit. One end of each light guide pipe is positioned close to an LED to be detected, the other end of each light guide pipe is positioned close to one photoelectric switching circuit, and the LED to be detected, the light guide pipe and the photoelectric switching circuit are in one-to-one correspondence; the control circuit is electrically connected with the gating circuit, the LED to be detected is lighted according to actual needs, and the gating circuit is controlled to drive the electric signal detection circuit to perform electric signal detection on the corresponding photoelectric switching circuit; and the electric signal detection circuit is connected with the gating circuit, each photoelectric switching circuit and the control circuit, performs electric signal detection on the corresponding photoelectric switching circuit under the driving effect of the gating circuit and feeds back a detection result to the control circuit so that the control circuit can determine whether the LED to be detected generates a fault according to the detection result. According to the invention, whether the LED generates the fault can be detected timely.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted equipment, in particular to a device and a method for detecting LED faults.
Background
At present, an LED is generally integrated in a vehicle-mounted instrument, and various information is indicated through the on and off of the LED. When the LED breaks down, the driver cannot acquire correct automobile state information, and driving safety is affected. However, in the conventional technology, the automobile is not provided with a device for timely detecting the failure of the LED, and generally depends on human discovery.
Disclosure of Invention
Based on this, it is necessary to provide an LED failure detection apparatus and method, which can detect whether an LED fails in time.
An LED fault detection device comprising: the system comprises at least one light guide pipe, at least one photoelectric conversion circuit, a gating circuit, an electric signal detection circuit and a control circuit; wherein,
one end of each light guide pipe is close to an LED to be detected, the other end of each light guide pipe is close to a photoelectric conversion circuit, and the LED to be detected, the light guide pipe and the photoelectric conversion circuit are in one-to-one correspondence;
the control circuit is electrically connected with the gating circuit, and controls the gating circuit to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit according to the LED to be tested which is lighted according to actual needs;
the electric signal detection circuit is connected with the gating circuit, each photoelectric conversion circuit and the control circuit, and is used for detecting electric signals of the corresponding photoelectric conversion circuit under the driving of the gating circuit and feeding back a detection result to the control circuit so that the control circuit can judge whether the LED to be detected has faults according to the detection result.
Furthermore, a light shield is arranged at one end, close to the LED to be detected, of each light guide pipe; and the outer surface of each light guide pipe is coated with a shading coating.
Specifically, each of the photoelectric conversion circuits includes a photodiode.
Specifically, the electric signal detection circuit includes a voltage/current sampling circuit and an analog-to-digital conversion circuit;
the voltage/current sampling circuit samples voltage or current of the photoelectric conversion circuit; the analog-to-digital conversion circuit converts the sampled analog signal into a digital signal and transmits the digital signal to the control circuit.
Specifically, the control circuit comprises an MCU, and the MCU reads the numerical value of the digital signal and judges whether the corresponding LED to be detected works normally according to whether the numerical value is within a preset range.
Further, the LED fault detection device also comprises an alarm circuit connected with the control circuit, and the alarm circuit gives an alarm when the LED to be detected has a fault.
An LED fault detection method, comprising:
receiving an optical signal of an LED to be detected through a light guide pipe, and transmitting the optical signal to a photoelectric conversion circuit, wherein the LED to be detected, the light guide pipe and the photoelectric conversion circuit are in one-to-one correspondence;
according to the actual need, the LED to be tested is lighted, and the control circuit controls the gating circuit to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit;
the electric signal detection circuit detects the electric signal of the photoelectric conversion circuit and feeds back the detection result to the control circuit;
and the control circuit judges whether the LED to be detected has a fault according to the detection result.
Further, the method further comprises:
arranging a light shield at one end of the light guide pipe close to the LED to be tested; and
and coating a shading coating on the outer surface of the light guide pipe.
Specifically, the method comprises the following steps: and sampling voltage or current of the photoelectric conversion circuit, converting the sampled analog signal into a digital signal, and judging whether the corresponding LED to be detected works normally according to whether the number of the digital signal is within a preset range.
Further, the method further comprises: and alarming when the LED to be detected fails.
According to the LED fault detection device and method, the light pipe is used for receiving the optical signal of the LED to be detected, the optical signal is transmitted to the photoelectric conversion circuit to be converted into the electric signal, the control circuit controls the electric signal detection circuit of the LED to be detected to carry out electric signal detection on the corresponding photoelectric conversion circuit according to actual needs, the detection result is fed back to the control circuit, and the control circuit judges whether the LED to be detected has a fault according to the detection result.
Drawings
FIG. 1 is a schematic diagram of an embodiment of an LED fault detection device;
fig. 2 is a schematic flow chart of a method for detecting LED failure in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, in one embodiment there is provided an LED fault detection apparatus comprising: the device comprises at least one light guide pipe, at least one photoelectric conversion circuit, a gating circuit, an electric signal detection circuit and a control circuit. One end of each light guide pipe is close to an LED to be detected, the other end of each light guide pipe is close to a photoelectric conversion circuit, and the LED to be detected, the light guide pipe and the photoelectric conversion circuit are in one-to-one correspondence. The control circuit is electrically connected with the gating circuit, and the gating circuit is controlled to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit according to the LED to be tested which is lighted according to actual needs. The electric signal detection circuit is connected with the gating circuit, each photoelectric conversion circuit and the control circuit, carries out electric signal detection on the corresponding photoelectric conversion circuit under the driving of the gating circuit, and feeds back the detection result to the control circuit so that the control circuit can judge whether the LED to be detected breaks down according to the detection result.
The working principle of the device in this embodiment can be specifically explained as follows:
each light pipe is pressed close to the one end of waiting to detect LED and is equipped with the lens hood, prevents that the ambient light intensity from to detecting the production influence, also prevents to detect the light that LED sent and is received by other light pipes. The outer surface of each light guide pipe is covered with a shading coating. The LED to be detected is integrated in various vehicle-mounted instruments and can be lightened according to actual needs (controlled by a human or automobile controller). When the LED is lighted, the light pipe can receive a certain light signal, and when the LED is extinguished, the light pipe cannot acquire the light signal with enough intensity.
The control circuit CAN be connected with the automobile controller in a CAN bus, a serial port and other modes, CAN directly acquire the identification number of the LED to be detected which needs to be lightened actually, controls the gating circuit to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit, and feeds back the detection result to the control circuit. Optionally, each of the photoelectric conversion circuits includes a photodiode, the gating circuit may be composed of a plurality of field effect transistors, and when some photodiodes need to be subjected to electrical signal detection, the field effect transistors are in a closed state to form a loop. It is to be understood that the form of the gate circuit is not limited thereto, and the present invention is not limited thereto. If the photodiode receives the light signal transmitted by the light pipe, current and voltage are generated. The electric signal detection circuit comprises a voltage/current sampling circuit and an analog-to-digital conversion circuit, wherein the voltage/current sampling circuit samples voltage or current of the photoelectric conversion circuit, and the analog-to-digital conversion circuit converts a sampled analog signal into a digital signal and transmits the digital signal to the control circuit. The control circuit comprises an MCU, the MCU reads the numerical value of the digital signal and judges whether the corresponding LED to be detected works normally or not according to whether the numerical value is within a preset range or not.
Optionally, the device in this embodiment may further include an alarm circuit connected to the control circuit, the alarm circuit may alarm when the to-be-detected LED fails, and the alarm circuit may include a speaker, a blinking LED, or another display screen.
Referring to fig. 2, a method of LED fault detection is provided, which is applied in the device of the embodiment of fig. 1. The method comprises the following steps:
step 201, receiving an optical signal of an LED to be tested through a light pipe, and transmitting the optical signal to a photoelectric conversion circuit.
The LED to be detected, the light guide pipe and the photoelectric conversion circuit are in one-to-one correspondence. And arranging a light shield at one end of the light guide pipe close to the LED to be tested, and coating a light shielding coating on the outer surface of the light guide pipe.
Step 202, controlling the gating circuit to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit through the control circuit according to the LED to be tested which needs to be lighted actually.
And step 203, the electric signal detection circuit detects the electric signal of the photoelectric conversion circuit and feeds back the detection result to the control circuit.
And step 204, the control circuit judges whether the LED to be detected has a fault according to the detection result.
Specifically, the voltage or current of the photoelectric conversion circuit is sampled, the sampled analog signal is converted into a digital signal, and whether the corresponding to-be-detected LED works normally is judged according to whether the number of the digital signal is within a preset range. And alarming when the LED to be detected fails.
According to the LED fault detection device and method provided in the above embodiments, the light pipe is used for receiving the optical signal of the LED to be detected, and transmitting the optical signal to the photoelectric conversion circuit to be converted into the electrical signal, the control circuit controls the electrical signal detection circuit to detect the electrical signal of the corresponding photoelectric conversion circuit according to the LED to be detected which is lighted according to actual needs, the detection result is fed back to the control circuit, and the control circuit judges whether the LED to be detected is in fault according to the detection result.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An LED fault detection device, comprising: the system comprises at least one light guide pipe, at least one photoelectric conversion circuit, a gating circuit, an electric signal detection circuit and a control circuit; wherein,
one end of each light guide pipe is close to an LED to be detected, the other end of each light guide pipe is close to a photoelectric conversion circuit, and the LED to be detected, the light guide pipe and the photoelectric conversion circuit are in one-to-one correspondence;
the control circuit is electrically connected with the gating circuit, and controls the gating circuit to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit according to the LED to be tested which is lighted according to actual needs;
the electric signal detection circuit is connected with the gating circuit, each photoelectric conversion circuit and the control circuit, and is used for detecting electric signals of the corresponding photoelectric conversion circuit under the driving of the gating circuit and feeding back a detection result to the control circuit so that the control circuit can judge whether the LED to be detected has faults according to the detection result.
2. The apparatus according to claim 1, wherein a light shield is disposed at an end of each of the light pipes adjacent to the LED to be detected; and the outer surface of each light guide pipe is coated with a shading coating.
3. The apparatus of claim 1, wherein each of the photoelectric conversion circuits comprises a photodiode.
4. The apparatus of any one of claims 1 to 3, wherein the electrical signal detection circuit comprises a voltage/current sampling circuit and an analog-to-digital conversion circuit;
the voltage/current sampling circuit samples voltage or current of the photoelectric conversion circuit; the analog-to-digital conversion circuit converts the sampled analog signal into a digital signal and transmits the digital signal to the control circuit.
5. The device according to claim 4, wherein the control circuit comprises an MCU, the MCU reads the numerical value of the digital signal and judges whether the corresponding LED to be detected works normally according to whether the numerical value is within a preset range.
6. The device of claim 1, further comprising an alarm circuit connected to the control circuit for alarming when the LED to be detected fails.
7. An LED fault detection method, comprising:
receiving an optical signal of an LED to be detected through a light guide pipe, and transmitting the optical signal to a photoelectric conversion circuit, wherein the LED to be detected, the light guide pipe and the photoelectric conversion circuit are in one-to-one correspondence;
according to the actual need, the LED to be tested is lighted, and the control circuit controls the gating circuit to drive the electric signal detection circuit to detect the electric signal of the corresponding photoelectric conversion circuit;
the electric signal detection circuit detects the electric signal of the photoelectric conversion circuit and feeds back the detection result to the control circuit;
and the control circuit judges whether the LED to be detected has a fault according to the detection result.
8. The method of claim 7, further comprising:
arranging a light shield at one end of the light guide pipe close to the LED to be tested; and
and coating a shading coating on the outer surface of the light guide pipe.
9. The method of claim 7, wherein the method comprises: and sampling voltage or current of the photoelectric conversion circuit, converting the sampled analog signal into a digital signal, and judging whether the corresponding LED to be detected works normally according to whether the number of the digital signal is within a preset range.
10. The method of claim 7, further comprising: and alarming when the LED to be detected fails.
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| CN201510539984.5A CN105093090A (en) | 2015-08-28 | 2015-08-28 | LED fault detection apparatus and method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510539984.5A CN105093090A (en) | 2015-08-28 | 2015-08-28 | LED fault detection apparatus and method |
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| CN108627729A (en) * | 2017-03-21 | 2018-10-09 | 聚积科技股份有限公司 | Failure detection system and method thereof |
| CN112665718A (en) * | 2020-12-03 | 2021-04-16 | 苏州浪潮智能科技有限公司 | Portable LED color difference detection device and detection method thereof |
| CN113074914A (en) * | 2021-03-08 | 2021-07-06 | 深圳市沛城智能控制技术有限公司 | Light emitting diode detection device and method |
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