From the current application situation, LED lighting has emerged as an alternative to traditional incandescent lamps and energy-saving lamps, and has been accepted to some extent by the general market, especially in some developed countries where energy is scarce, such as Japan. Although LED is known for its longevity, from the actual service life, it is always unable to reach the nominal service life of the product. The real reason is precisely the problem of LED drive quality. The entire power industry is in a relatively chaotic situation, and the quality of its products is also uneven.
Specially planned this low-power LED driver power evaluation, invited Guangdong Kegu Power Co., Ltd., Zhongshan Niubao Electronic Technology Co., Ltd., Zhongshan Zhiguan Lighting Technology Co., Ltd., Wuxi Anteyuan Technology Co., Ltd., Dongguan City Five representative power supply companies, such as Crown Semiconductor Lighting Co., Ltd., invited third-party testing organizations to fully reveal the true performance of low-power LED driver power supplies from safety, EMC and energy efficiency. The following is the body of the report.
Sample information table
Safety regulations
In this evaluation, constant voltage accuracy, voltage range, withstand voltage, temperature rise test and structural inspection were performed on five LED driver power supplies (product information as shown below) for Kegu, Niubao, Zhiguan, Anteyuan and Lingguan. .
First, constant current accuracy
The test is carried out in accordance with Section 7.2 of GB/T 24825; during the test, the power input is carried out using 106% of the highest voltage of the manufacturing input voltage range and 92% of the lowest voltage. The control unit output load is performed using the maximum load and minimum load claimed by the manufacturer. The specific test results are as follows:
It can be seen from the test data that at the highest voltage and the lowest voltage, there is a fluctuation of 2 mA in comparison with the nominal current; in the case of different voltages at the same frequency, 1 mA fluctuation occurs; the overall fluctuation range is 0-2 mA. The constant current accuracy is still relatively high, and it can better adapt to changes in voltage magnitude and frequency.
At the minimum voltage, there is a 10-15 mA fluctuation in the comparison of the nominal current, and there is a 12-15 mA fluctuation in the maximum voltage. When the voltage is the same at the same frequency, there is no fluctuation. Niu Bao this driver, voltage changes have a greater impact on constant current accuracy, but it can better adapt to changes in voltage frequency.
At the lowest voltage, there is a 9-15 mA fluctuation in the comparison of the nominal current, and a 9-11 mA fluctuation occurs in the highest voltage. The same voltage has no fluctuations in the case of different voltage frequencies, and the overall fluctuation is in the range of 9-15 mA. This drive voltage change has a great influence on the constant current accuracy, and the voltage frequency has no significant influence on the constant current accuracy.
In the case of minimum and maximum voltages, 8-10 mA fluctuations occurred in comparison with the nominal current. No different voltage frequencies were tested, and the overall fluctuation was 9-10 mA.
At the minimum voltage, the nominal current has a fluctuation of 7 mA, and the maximum voltage has a fluctuation of 2 mA. When the voltage is the same frequency, there is no fluctuation. The overall fluctuation range is 2-7 mA. The voltage magnitude has a certain influence on the constant current accuracy, and the frequency changes. There is no significant change.
The five drivers of this evaluation, the output current is within ±10%, in line with the requirements. Although the Co谷 power supply fluctuates slightly when the voltage frequency changes, the output current fluctuates relatively small when the voltage magnitude changes, the overall fluctuation is small, and the constant current accuracy is relatively high.
Second, the voltage range
The output voltage is measured at rated output current. During the test, the power input was made using the highest and lowest voltages of the manufacturer's nominal input voltage range. The control unit output load is performed using the maximum load and minimum load claimed by the manufacturer.
At the highest and lowest nominal input voltages: the output voltage fluctuates 1.7-3.7V against the nominal voltage; the same amplitude fluctuates at the same frequency and at different frequency frequencies.
In the case of the highest and lowest nominal input voltage: when the voltage frequency is 50Hz, the output voltage fluctuates from the nominal voltage to 3-5.8V: the voltage amplitude is 3.1-5.8V when the voltage frequency is 60Hz, and the input voltage frequency is the output voltage of the power supply. Caused a slight impact
At the highest and lowest nominal input voltage: when the voltage frequency is 50Hz, the output voltage fluctuates from 0.5-3.9V to the nominal voltage; 0.5-4V fluctuates at 60Hz, and the voltage fluctuates slightly at different frequency frequencies.
At the highest and lowest nominal input voltages, the output voltage fluctuates from 1.9 to 4.3V against the nominal voltage.
At the highest and lowest nominal input voltage: when the voltage frequency is 47Hz, the output voltage fluctuates 7.1-9.1V compared with the nominal voltage. When the voltage frequency is 63Hz, there is a fluctuation of 4.6-9.1V; different frequency voltages also output voltage Caused a small fluctuation.
Third, withstand voltage test
The withstand voltage test meets the requirements.
Fourth, temperature rise test
The temperature of the above measuring points of the five products did not exceed the limit and met the requirements.
Fifth, structural inspection
Wire pull-proof device
The stand-alone LED driver power supply needs to have a wire pull-proof device. Observe five LED drive power supplies for Kegu, Niubao, Zhiguan, Anteyuan and Lingguan, and wire pull-proof devices are provided at the input and output ends.
Creepage distance and clearance
1. Creepage distance and clearance requirements of live parts to the outer casing : creepage distance 6.2mm, clearance 6.2mm (based on working voltage not exceeding 264V); creepage distance 6mm, clearance 6mm (based on working voltage not exceeding 250V) .
Actual measurement distance: Kegu 6.4mm, Niubao 6.8mm, Zhiguan 7.7mm, Ante source 7.6mm, collar 7.7mm. All 6 products meet the requirements.
2. Creepage distance and clearance requirements between PCB boards LN : creepage distance 3.1mm, clearance 3.1mm (based on working voltage not exceeding 264V); creepage distance 3mm, clearance 3mm (based on working voltage not exceeding 250V) ).
The actual test distance: Kegu 6.3mm, Niubao 6.3mm, Zhiguan 4.6mm, Ante source 5.8mm, collar 5.2mm. All 6 products meet the requirements.
3. Creepage distance and clearance requirements between the two legs of the fuse : creepage distance 3.1mm, clearance 3.1mm (based on working voltage not exceeding 264V); creepage distance 3mm, clearance 3mm (based on working voltage not exceeding 250V) ).
Actual measurement distance: Kegu 3.2mm, Niubao 2.2mm, Zhiguan 3.1mm, Ante source 3.4mm, collar 3.4mm.
Among them, the distance between the two legs of Niubao's fuse is less than the required 3mm (see the figure below), and the other models meet the requirements.
4. Creepage distance and clearance requirements between the primary and secondary of the power board : creepage distance 6.2mm, clearance 6.2mm (based on working voltage not exceeding 264V); creepage distance 6mm, clearance 6mm (based on working voltage not exceeding 250V).
The actual test distance: Kegu 6.6mm, Niubao 4.1mm, Zhiguan 2.6mm, Ante source 5.3mm, collar 7.2mm.
The creepage distance between the primary and secondary power supply boards of Niubao is only 4.1mm, which is less than the required 6mm, which does not meet the requirements. See the figure below for details.
The creepage distance between the primary and secondary of the power supply board of Zhiguan is only 2.6mm, which is less than the required 6mm, which does not meet the requirements. See the figure below for details.
The creepage distance between the primary and secondary of the power supply board of Anteyuan is only 5.3mm, which is less than the required 6.2mm. It does not meet the requirements, see the following figure.
The clearance between the primary circuit and the secondary circuit is only 5.6mm
Here the clearance between the primary (core) and the secondary (pin) is only 5.3mm
Safety requirements are the most basic and critical requirements of electrical products, because they involve consumers' life safety and property safety, which is the most basic guarantee that a product needs to provide consumers. According to the results of the structural inspection, not all of the five products have been passed. It is recommended that the production enterprises strengthen the supervision of product design and production quality control, because ensuring the safety of consumers' lives and property is the minimum for a company to its consumers. committed to.
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