CN210243759U

CN210243759U - Electromagnetic compatibility test system for LED controller

Info

Publication number: CN210243759U
Application number: CN201920897951.1U
Authority: CN
Inventors: Gang Yin; 尹刚; Jun Zhang; 张俊; Feng Wang; 王峰
Original assignee: Keboda Technology Co ltd
Current assignee: Keboda Technology Co ltd
Priority date: 2019-06-14
Filing date: 2019-06-14
Publication date: 2020-04-03
Anticipated expiration: 2029-06-14

Abstract

An LED controller electromagnetic compatibility test system is characterized in that an LED controller is arranged in a anechoic chamber and is respectively and electrically connected with a plurality of paths of LED loads; the test system comprises a plurality of lighting units, a plurality of optical fibers, a photoelectric conversion device and a plurality of display monitoring devices. The lighting units respectively correspond to the multiple paths of LED loads and the optical fibers, each lighting unit comprises a unit shell and a lighting element, the unit shell is provided with a cabin which is shielded from the outside, and each lighting element, the corresponding LED load and the input end of the optical fiber are positioned in the same cabin and used for focusing light emitted by the LED loads to the input end of the optical fiber; the output end of the multi-path optical fiber, the photoelectric conversion device and the plurality of display monitoring devices are arranged outside the anechoic chamber; the photoelectric conversion device converts the optical signals output by the multiple optical fibers into multiple voltage signals and outputs the multiple voltage signals to the multiple display monitoring devices. The utility model discloses can obtain stable, objective output result when the LED controller of the different kind LED load of test control.

Description

Electromagnetic compatibility test system for LED controller

Technical Field

The utility model relates to an electromagnetic compatibility testing arrangement especially relates to LED controller electromagnetic compatibility test system.

Background

At present, in electromagnetic compatibility immunity tests on automobile headlamp LED controllers, tail lamp LED controllers and the like, the following two methods are mainly adopted to monitor the output of the LED controllers: the first method is to judge the status grade by checking the on/off and flashing of an LED load electrically connected with an LED controller; the second method is based on the principle that as shown in fig. 1, optical signals emitted from a plurality of LED loads 82 electrically connected to an LED controller 81 to be tested are converted into electrical signals by a photoelectric conversion device 93, and then the electrical signals are transmitted to a display monitoring device 94 outside an anechoic chamber 97 through an optical fiber 92, and the electrical signals are displayed and monitored by the display monitoring device 94. The display monitoring device 94 is typically a digital display or an oscilloscope.

The first method is lack of data records, is not beneficial to evaluating the experimental report result by the whole car factory, and has strong subjectivity and less rigor of monitoring mode. Although the second method increases the objectivity of monitoring to some extent, the whole car factory has a certain data base in the evaluation of the experimental result, but the following disadvantages still exist:

1. currently, an LED controller needs to control different types of LED loads, such as a high beam, a low beam, a daytime running light, a turn signal light, and the like, the control modes for different LED loads and the magnitudes of currents output to the LED loads are different, the luminances of the LED loads are also different, and the working states of the LED loads cannot be objectively evaluated in the monitoring mode;

2. the photoelectric conversion device 93 is placed inside the anechoic chamber 97, and the electromagnetic interference resistance of the photoelectric conversion device directly determines whether an electric signal can be stably output;

3. the photoelectric conversion device 93 employs common internal photoelectric devices such as a photoconductive device (photoresistor) and a photovoltaic device (photodiode). The photoresistor has poor time response, the resistance change rate of the photoresistor is greatly influenced by the ambient temperature and the intensity of the light source, the output current of the photodiode is small, and the dark current is large.

Disclosure of Invention

The utility model aims to solve the technical problem that a LED controller electromagnetic compatibility test system is provided, it can obtain stable, objective output result when the LED controller of the different kind LED load of test control.

In order to solve the above technical problem, an embodiment of the present invention provides an LED controller electromagnetic compatibility testing system, where the LED controller is disposed in a anechoic chamber and electrically connected to multiple paths of LED loads, respectively, where the LED controller electromagnetic compatibility testing system includes multiple lighting units, multiple paths of optical fibers, a photoelectric conversion device, and multiple display monitoring devices with the same number as the multiple paths of LED loads; the plurality of lighting units correspond to the plurality of paths of LED loads one by one, and the plurality of paths of optical fibers correspond to the plurality of lighting units one by one; each lighting unit comprises a unit shell and a lighting element, the unit shell is provided with a cabin which is shielded from the outside light, the lighting element, the LED load corresponding to the lighting unit and the input end of the corresponding optical fiber are all arranged in the cabin, and the lighting element is used for focusing light emitted by the corresponding LED load to the input end of the corresponding optical fiber; the multiple optical fibers respectively pass through the cabins, and the output ends of the multiple optical fibers, the photoelectric conversion device and the multiple display monitoring devices are arranged outside the anechoic chamber; the photoelectric conversion device is used for respectively converting the optical signals output by the output ends of the multiple paths of optical fibers into multiple paths of voltage signals and respectively outputting the multiple paths of voltage signals to the multiple display monitoring devices; each display monitoring device is used for displaying and monitoring the received voltage signal.

The utility model discloses at least, following technological effect has:

1. the embodiment of the utility model provides an independent daylighting is carried out to each way LED load respectively through different daylighting units to show and monitor after carrying out independent photoelectric conversion to each way light signal, this kind of monitoring mode is more objective, and the output state of each way LED load can be independently judged, is favorable to whole car factory to the aassessment of experimental result;

2. the embodiment of the utility model provides a do not carry out photoelectric processing in the anechoic chamber, only daylighting is carried out, the light signal transmission who will gather by optic fibre to locate the photoelectric conversion device of anechoic chamber outside to eliminate the anti-interference problem that photoelectric conversion device placed inside the anechoic chamber and existed, make photoelectric conversion device can output voltage signal steadily;

3. the photoelectric conversion device uses the silicon photocell, and compared with a photosensitive resistor and a photodiode, the photoelectric conversion device has better response sensitivity, the current and the illumination have better linear characteristics, and the output stability is also better, so that the data record of the display monitoring device also has better response sensitivity, and a more stable and objective voltage curve can be obtained.

Drawings

Fig. 1 shows a schematic diagram of a conventional LED controller electromagnetic compatibility test system.

Fig. 2 shows a schematic diagram of an embodiment of the present invention, which is an electromagnetic compatibility testing system for an LED controller.

Fig. 3 is a schematic block diagram of a photoelectric conversion device according to an embodiment of the present invention.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Fig. 2 shows a schematic diagram of an embodiment of the present invention, which is an electromagnetic compatibility testing system for an LED controller. Please refer to fig. 2. The LED controllers 81 to be tested are disposed in the anechoic chamber 7 and electrically connected to the multiple LED loads 82, respectively.

According to the utility model discloses a LED controller electromagnetic compatibility test system of embodiment includes a plurality of daylighting units 1, multichannel optic fibre 2, photoelectric conversion device 3 and a plurality of display monitoring device 4 the same with the quantity of multichannel LED load 82.

The plurality of lighting units 1 correspond to the plurality of paths of LED loads 82 one by one, and the plurality of paths of optical fibers 2 correspond to the plurality of lighting units 1 one by one. Each lighting unit 1 includes a unit housing 11 and a lighting element 12, the unit housing 11 has a chamber 110 shielded from the outside light, the lighting element 12, the LED load 82 corresponding to the lighting unit 1, and the input end of the corresponding optical fiber 2 are all disposed in the chamber 110, and the lighting element 12 is configured to focus light emitted by the corresponding LED load 82 to the input end of the corresponding optical fiber 2. In the example of fig. 2, the unit case 11 has a box shape, and the unit cases 11 of the plurality of lighting units are provided independently of each other. In another embodiment, the unit housing 11 may also be in the shape of a cover and may cover the LED load. In another embodiment, the unit housings 11 of the lighting units 1 are part of one housing, and may also form multiple compartments that are shielded from light.

In this embodiment, the light collection element 12 comprises a focusing lens that focuses the light emitted by the LED load 82 into a point source to match the transmission of the optical fiber 2. Optionally, the focusing lens is a fresnel lens. By adopting a plurality of lighting units 1, independent lighting of the plurality of paths of LED loads 82 is realized, and in addition, because only lighting processing is carried out in the anechoic chamber 7, the anti-interference problem existing when the photoelectric conversion device is placed in the anechoic chamber is eliminated.

The multiple optical fibers 2 pass through the respective chambers 110, and the output ends of the multiple optical fibers 2, the photoelectric conversion device 3, and the plurality of display monitoring devices 4 are disposed outside the anechoic chamber 7. The photoelectric conversion device 3 is used for converting optical signals output by the output end of the multi-path optical fiber 2 into multi-path voltage signals respectively and outputting the multi-path voltage signals to the plurality of display monitoring devices 4 respectively; each display monitoring device 4 is used for displaying and monitoring the received voltage signal. Optionally, each display monitoring device is a digital display or an oscilloscope.

Fig. 3 is a schematic block diagram of a photoelectric conversion device according to an embodiment of the present invention. Referring to fig. 3, the photoelectric conversion device 3 includes a silicon photocell array 31 and an I/V conversion circuit 32.

The silicon photocell array 31 is used for converting the optical signals output by the output ends of the multiple optical fibers 2 into multiple photocurrent signals respectively. When the PN junction in the silicon photocell is in zero bias or reverse bias, an internal electric field exists in a junction surface depletion region, and when a light signal is received, incident photons excite bound electrons, and electron hole pairs drift under the action of the internal electric field to generate photocurrent. Compared with a photoresistor and a photodiode, the silicon photocell has better response sensitivity, current and illumination have better linear characteristics, and output stability is better.

The input end of the I/V conversion circuit 32 is electrically connected to the output end of the silicon photocell array 31, the output end of the I/V conversion circuit 32 is electrically connected to the input ends of the plurality of display monitoring devices 4, respectively, and the I/V conversion circuit 32 is configured to convert the multi-path photocurrent signals output by the silicon photocell array into multi-path voltage signals and output the multi-path voltage signals to the plurality of display monitoring devices 4, respectively, so as to display, monitor and record data.

The embodiment of the utility model provides a carry out independent daylighting to each way LED load respectively through the daylighting unit of difference to show and control after carrying out independent photoelectric conversion to every way light signal, this kind of monitoring mode is more objective, and the output state of each way LED load can independently be judged, is favorable to whole car factory to the aassessment of experimental result.

Claims

1. An LED controller electromagnetic compatibility test system is arranged in a anechoic chamber and is respectively and electrically connected with a plurality of paths of LED loads, and is characterized by comprising a plurality of lighting units, a plurality of paths of optical fibers, a photoelectric conversion device and a plurality of display monitoring devices, wherein the number of the display monitoring devices is the same as that of the paths of LED loads;

the plurality of lighting units are in one-to-one correspondence with the plurality of paths of LED loads, and the plurality of paths of optical fibers are in one-to-one correspondence with the plurality of lighting units; each lighting unit comprises a unit shell and a lighting element, the unit shell is provided with a cabin which is shielded from the outside light, the lighting element, the LED load corresponding to the lighting unit and the input end of the corresponding optical fiber are all arranged in the cabin, and the lighting element is used for focusing light emitted by the corresponding LED load to the input end of the corresponding optical fiber;

the multiple optical fibers respectively penetrate through the cabins, and the output ends of the multiple optical fibers, the photoelectric conversion device and the multiple display monitoring devices are arranged outside the anechoic chamber; the photoelectric conversion device is used for respectively converting the optical signals output by the output ends of the multiple paths of optical fibers into multiple paths of voltage signals and respectively outputting the multiple paths of voltage signals to the multiple display monitoring devices; each display monitoring device is used for displaying and monitoring the received voltage signal.

2. The LED controller emc testing system of claim 1, wherein said lighting element comprises a focusing lens.

3. The LED controller electromagnetic compatibility testing system of claim 2, wherein the focusing lens is a Fresnel lens.

4. The LED controller electromagnetic compatibility test system of claim 1, wherein the photovoltaic conversion device comprises a silicon photovoltaic cell array and an I/V conversion circuit;

the silicon photocell array is used for converting optical signals output by the output ends of the multiple paths of optical fibers into multiple paths of photocurrent signals respectively;

the input end of the I/V conversion circuit is electrically connected with the output end of the silicon photocell array, the output end of the I/V conversion circuit is electrically connected with the input ends of the plurality of display monitoring devices respectively, and the I/V conversion circuit is used for converting the multi-path photocurrent signals output by the silicon photocell array into multi-path voltage signals and outputting the multi-path voltage signals to the plurality of display monitoring devices respectively.

5. The LED controller emc testing system of claim 1, wherein each of the display monitoring devices is a digital display or an oscilloscope.

6. The LED controller electromagnetic compatibility testing system of claim 1, wherein the unit housings of said plurality of lighting units are disposed independently of each other.

7. The LED controller emc testing system of claim 1, wherein the unit housings of the plurality of lighting units are each part of one housing and form a plurality of compartments shielded from light from each other.