CN111988890A - Light emitting diode lighting equipment power supply for electromagnetic compatibility test - Google Patents
Light emitting diode lighting equipment power supply for electromagnetic compatibility test Download PDFInfo
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- CN111988890A CN111988890A CN202011153477.5A CN202011153477A CN111988890A CN 111988890 A CN111988890 A CN 111988890A CN 202011153477 A CN202011153477 A CN 202011153477A CN 111988890 A CN111988890 A CN 111988890A
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- power supply
- integrated lamp
- led integrated
- electromagnetic
- electromagnetic interference
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- 238000012360 testing method Methods 0.000 title claims abstract description 29
- 239000011324 bead Substances 0.000 claims abstract description 33
- 238000011084 recovery Methods 0.000 claims abstract description 4
- 230000017525 heat dissipation Effects 0.000 claims description 3
- 238000005286 illumination Methods 0.000 abstract description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 230000005672 electromagnetic field Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 230000036039 immunity Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/36—Circuits for reducing or suppressing harmonics, ripples or electromagnetic interferences [EMI]
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
Abstract
The power supply of the light emitting diode lighting equipment for the electromagnetic compatibility test mainly comprises an LED integrated lamp bead (1), a linear power supply (2), an electromagnetic interference filter (22) and a radiator (3); the LED integrated lamp beads (1) are powered by a linear power supply (2) through an electromagnetic interference filter (22), so that the LED integrated lamp beads (1) work in a constant voltage state; the linear power supply (2) comprises a transformer (20) and a rectifier (21); the rectifier (21) adopts a fast recovery diode, so that harmonic waves generated by the rectifying circuit are lower than 1kHz, and the radiator (3) adopts a natural radiating mode to reduce electromagnetic interference. The lighting equipment is energy-saving and high in illumination, does not generate electromagnetic interference signals with the frequency of more than 1kHz, avoids interference on electromagnetic compatibility testing, and has strong electromagnetic interference resistance.
Description
Technical Field
The invention relates to an electromagnetic compatibility test, in particular to a light emitting diode lighting equipment power supply for the electromagnetic compatibility test.
Background
The electromagnetic compatibility test aims at verifying the electromagnetic emissions or electromagnetic immunity (sensitivity to external electromagnetic fields) generated by the electrical and electronic products or systems under test (collectively referred to as test pieces). The electromagnetic compatibility test is usually carried out in an anechoic chamber, and no external interference can enter the anechoic chamber in the anechoic chamber, and no electromagnetic interference can be emitted from an uninhibited test piece.
The indoor lighting equipment for the electromagnetic compatibility test generally adopts a halogen lamp or an incandescent lamp which is free of radiation and short in service life, large-area electromagnetic wave reflection is not allowed due to the fact that the interior of the anechoic chamber is not covered by the ground, a lamp radiator and a reflector are made of metal materials, electromagnetic wave reflection can be formed, meanwhile, ventilation and heat dissipation conditions in the anechoic chamber are generally poor, and therefore lamps which are small in size, small in quantity and low in ventilation requirements need to be used in the anechoic chamber. In addition, when testing the sensitivity index of the test object related to luminescence to the external electromagnetic field, the lighting equipment in the anechoic chamber is required to provide a very stable light source without generating electromagnetic interference radiation affecting the electromagnetic compatibility test, and the lighting equipment in the anechoic chamber is required to have sufficiently strong anti-interference capability.
With the development of LED (light emitting diode) lighting technology, customers desire to use reliable, energy-saving, and high-illuminance LED lighting devices.
The existing LED lighting equipment is generally powered by a constant current source due to the fact that LED lamp beads have nonlinear volt-ampere characteristics, temperature coefficients of the volt-ampere characteristics, poor consistency of the volt-ampere characteristics of the lamp beads and the like. Since the constant current source usually uses a switching power supply, it can generate electromagnetic radiation, and the frequency of the electromagnetic radiation generated by the lamp can exceed 10kHz, which forms electromagnetic interference and affects the result of the electromagnetic compatibility test. On the other hand, the high-power electromagnetic signal generated during the electromagnetic compatibility test can interfere the normal work of the power supply, even cause the protection starting of the power supply, and can also disturb the power supply of the LED lighting equipment to influence the stability of lighting. If the problem of electromagnetic compatibility of the LED lamp driven by the constant current source is solved, the shielding device is used for carrying out electromagnetic shielding on the LED lamp, but the light-emitting area cannot be shielded by a conductive material with good light transmittance because the LED lamp light can generate heat.
Disclosure of Invention
The invention provides a light-emitting diode lighting equipment power supply for electromagnetic compatibility test, which does not generate electromagnetic interference signals with frequency of more than 1kHz, avoids the interference of LED lighting equipment on the electromagnetic compatibility test, and simultaneously improves the anti-interference performance of the LED lighting equipment.
The technical scheme is as follows: the technical scheme adopted by the invention for solving the technical problems is as follows:
the power supply of the light emitting diode lighting equipment for the electromagnetic compatibility test is characterized by comprising an LED integrated lamp bead, a linear power supply, an electromagnetic interference filter and a radiator; the linear power supply supplies power to the LED integrated lamp beads through the electromagnetic interference filter, so that the LED integrated lamp beads work in a constant voltage state; the LED integrated lamp beads and the linear power supply are tightly close to the radiator; the linear power supply includes a transformer and rectifier and an electromagnetic interference filter.
The rectifier adopts a fast recovery diode, so that the harmonic generated by the rectifying circuit is lower than 1 kHz.
And selecting a radiator with proper thickness and easy heat dissipation to ensure that the highest temperature of the radiator does not exceed 50 ℃ after the LED integrated lamp bead works for more than 15 minutes under the ventilation-free condition.
The LED integrated lamp beads with small temperature coefficients, particularly the LED integrated lamp beads with small temperature coefficients in the temperature range of 10-50 ℃ are adopted, so that the long-term stable and reliable work can be ensured in the environment of 23 +/-5 ℃ required by an electromagnetic compatibility laboratory.
The working voltage of the LED integrated lamp bead is between 20 and 40V.
Because the power of a single LED lighting lamp does not exceed 100 watts, the area of the lamp does not exceed 1000cm2The influence of large-area electromagnetic wave reflection on the performance of the anechoic chamber is avoided. The electromagnetic interference filter between the linear power supply and the LED integrated lamp beads improves the anti-electromagnetic interference capability of the linear power supply, further reduces the electromagnetic interference generated by the linear power supply, and also improves the electromagnetic interference resistance capability of the LED lighting equipment.
Has the advantages that: the invention has the beneficial effects that: the light-emitting diode lighting equipment power supply for the electromagnetic compatibility test has the characteristics of long service life, low requirement on ventilation conditions and the like, does not influence the performance of an electromagnetic compatibility test anechoic chamber, does not generate electromagnetic radiation with frequency higher than 1kHz, has strong electromagnetic anti-interference capability, and can meet the requirements of military standard for testing from 10kHz and automobile electronics for testing from 150 kHz.
Drawings
FIG. 1 is a schematic diagram of a power supply of an LED lighting device for electromagnetic compatibility testing according to the present invention;
the LED integrated lamp comprises an LED integrated lamp bead 1, a linear power supply 2, a transformer 20, a rectifier 21, an electromagnetic interference filter 22, a radiator 3 and a power line 4.
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings. The specific embodiments described herein are merely illustrative of the invention and do not limit the invention to the specific embodiments.
The embodiment adopted by the invention is as follows:
the power supply of the light emitting diode lighting equipment for the electromagnetic compatibility test comprises an LED integrated lamp bead 1, a linear power supply 2, an electromagnetic interference filter 22 and a radiator 3; the linear power supply 2 supplies power to the LED integrated lamp bead 1 through the electromagnetic interference filter 22, so that the LED integrated lamp bead 1 works in a constant voltage state; the LED integrated lamp bead 1 and the linear power supply 2 are abutted against the radiator 3; the linear power supply 2 includes a transformer 20 and a rectifier 21.
The rectifier 21 employs fast recovery diodes so that the harmonics generated by the rectifier circuit are below 1 kHz.
The radiator 3 adopts a natural radiating mode to reduce electromagnetic interference; meanwhile, the temperature of the radiator 3 is maintained at 20-50 ℃ after the LED integrated lamp beads work for more than 15 minutes.
The LED integrated lamp beads 1 with small temperature coefficients are adopted, particularly the LED integrated lamp beads 1 with small temperature coefficients in the temperature range of 10 ℃ to 50 ℃ are adopted, so that the size and the weight of the radiator 3 are reduced in the environment of 23 +/-5 ℃ required by an electromagnetic compatibility laboratory.
The linear power supply 2 supplies power to the LED integrated lamp beads 1 through a power line 4.
The working voltage of the LED integrated lamp bead 1 is between 20 and 40V.
The installation position of the LED integrated lamp bead 1 can be selected according to the illumination requirement; and selecting the quantity and power of the LED integrated lamp beads 1, and selecting the LED integrated lamp beads 1 with good using consistency.
Because the power of a single LED lighting lamp does not exceed 100 watts, the area of the lamp does not exceed 1000cm2The influence of large-area electromagnetic wave reflection on the performance of the anechoic chamber is avoided. The electromagnetic interference filter 22 from the linear power supply 2 to the LED integrated lamp bead 1 not only improves the resistance of the linear power supply 2The electromagnetic interference capability is further reduced, the electromagnetic interference generated by the linear power supply 2 is further reduced, and the electromagnetic interference resistance capability of the LED lighting equipment is also improved.
The present invention can be realized in light of the above.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modifications, equivalents, improvements and the like within the spirit and scope of the present invention are intended to be included therein.
Claims (3)
1. A power supply of a light emitting diode lighting device for electromagnetic compatibility testing is characterized in that the device comprises an LED integrated lamp bead (1), a linear power supply (2), an electromagnetic interference filter (22) and a radiator (3); the LED integrated lamp beads (1) are powered by a linear power supply (2) through an electromagnetic interference filter (22), so that the LED integrated lamp beads (1) work in a constant voltage state; the LED integrated lamp beads (1) and the linear power supply (2) are abutted against the radiator (3); the linear power supply (2) comprises a transformer (20) and a rectifier (21).
2. The power supply of LED lighting device for EMC testing as claimed in claim 1, wherein the rectifier (21) is a fast recovery diode such that the harmonic generated by the rectifier circuit is below 1 kHz.
3. The power supply of the LED lighting device for the EMC test according to claim 1, wherein the heat sink (3) adopts a natural heat dissipation manner to reduce the EMI; meanwhile, the temperature of the radiator (3) is maintained at 20-50 ℃ after the LED integrated lamp beads (1) work for more than 15 minutes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011153477.5A CN111988890A (en) | 2020-10-26 | 2020-10-26 | Light emitting diode lighting equipment power supply for electromagnetic compatibility test |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011153477.5A CN111988890A (en) | 2020-10-26 | 2020-10-26 | Light emitting diode lighting equipment power supply for electromagnetic compatibility test |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111988890A true CN111988890A (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011153477.5A Pending CN111988890A (en) | 2020-10-26 | 2020-10-26 | Light emitting diode lighting equipment power supply for electromagnetic compatibility test |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111988890A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201228869Y (en) * | 2008-06-06 | 2009-04-29 | 周书玮 | Led lamp structure |
| CN103363402A (en) * | 2013-07-16 | 2013-10-23 | 杭州远方仪器有限公司 | Lighting device for anechoic chamber |
| CN203658481U (en) * | 2013-10-15 | 2014-06-18 | 快特电波科技(苏州)有限公司 | Electric wave darkroom |
| CN204291485U (en) * | 2014-11-27 | 2015-04-22 | 惠州比亚迪实业有限公司 | LED power drive unit |
| CN204291470U (en) * | 2014-11-27 | 2015-04-22 | 比亚迪股份有限公司 | LED power drive unit |
| CN105491713A (en) * | 2015-12-23 | 2016-04-13 | 浙江闲兴光电科技有限公司 | High-power LED street lamp drive circuit |
| CN108302337A (en) * | 2017-01-12 | 2018-07-20 | 亿光电子工业股份有限公司 | LED lamp and its component, radiating seat and LED Wireless Light modulating systems |
| CN108776272A (en) * | 2018-05-28 | 2018-11-09 | 煤炭科学技术研究院有限公司 | A kind of test system of frequency conversion equipment Electro Magnetic Compatibility |
-
2020
- 2020-10-26 CN CN202011153477.5A patent/CN111988890A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201228869Y (en) * | 2008-06-06 | 2009-04-29 | 周书玮 | Led lamp structure |
| CN103363402A (en) * | 2013-07-16 | 2013-10-23 | 杭州远方仪器有限公司 | Lighting device for anechoic chamber |
| CN203658481U (en) * | 2013-10-15 | 2014-06-18 | 快特电波科技(苏州)有限公司 | Electric wave darkroom |
| CN204291485U (en) * | 2014-11-27 | 2015-04-22 | 惠州比亚迪实业有限公司 | LED power drive unit |
| CN204291470U (en) * | 2014-11-27 | 2015-04-22 | 比亚迪股份有限公司 | LED power drive unit |
| CN105491713A (en) * | 2015-12-23 | 2016-04-13 | 浙江闲兴光电科技有限公司 | High-power LED street lamp drive circuit |
| CN108302337A (en) * | 2017-01-12 | 2018-07-20 | 亿光电子工业股份有限公司 | LED lamp and its component, radiating seat and LED Wireless Light modulating systems |
| CN108776272A (en) * | 2018-05-28 | 2018-11-09 | 煤炭科学技术研究院有限公司 | A kind of test system of frequency conversion equipment Electro Magnetic Compatibility |
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Application publication date: 20201124 |