The lack of standards has always been a bottleneck restricting the development of the LED industry. To this end, at the end of 2009, the National Standardization Administration issued a number of LED-related standards. The introduction of a series of new standards will help promote the more standardized and healthy development of China's LED lighting industry.
After more than a year of transition, a number of LED standards will be implemented in November and December this year. Recently, Yu Anqi, deputy director of the National Electric Light Source Quality Supervision and Inspection Center (Shanghai), said that although the implementation of the standard is imminent, there are still many people in the industry who do not fully understand the standard content. At the first LED general lighting product and technology seminar, Yu Anqi explained in detail the main terms, characteristics and scope of application of some important new national standards.
GB24819-2009 Safety requirements for LED modules for general lighting
The standard was promulgated on November 30, 2009 and implemented on November 1, 2010. Yu Anqi said that the standard is equivalent to IEC62031 2008. According to the installation method, the module is divided into integral type, built-in type and independent type, which is the same as the classification principle of the control device of GB19510 series lamps. The standard body clause basically refers to the GB19510.1 and GB7000.1 standards, and its biggest feature is the use of the IEC62471 2006 lamp and lamp system photobiological safety standards. This is because it is considered that the LED lighting products can enter the room and may be directly seen at a relatively close distance. Therefore, the requirement for eye protection has been proposed, and the standard of the IEC60825 laser device has not been applied before.
GB/T24823-2009 LED lighting performance requirements for general lighting
The standard has several characteristics: First, the power factor requirement is in accordance with the declared value, and the measured value must not be lower than 0.05 of the declared value; second, the harmonic should meet the requirements of GB17625.1. It is worth reminding that the above two items are only applicable to LED modules that are directly connected to the power source from the ballast, and the others are borne by the driver. In addition, the standard stipulates that the radio disturbance (EMI) characteristics should meet the requirements of GB17743, but only the LED module directly connected to the power supply needs to perform the "power terminal disturbance" detection, and the other is also assumed by the driver. "Radiation disturbance (including 9KHz to 30MHz and 30MHz to 300MHz)" is performed only when the current frequency at which the LED is driven is greater than 100 Hz. At the same time, the electromagnetic compatibility immunity (EMS) should meet the requirements of GB/T18595, but only the LED module directly connected to the power supply needs to perform the "anti-pulse group" detection, and other LED modules are still borne by the driver. The standard also requires that the "anti-static discharge" test should generally be carried out, but only for the LED module used in the case of radio frequency interference or power frequency interference. The optical performance parameters of this standard are in accordance with GB/T24824.
GB/T24824-2009 LED module test method for general lighting
The standard mainly refers to the CIE127 2007 standard, and its detection method focuses on: monitoring the temperature of the specified temperature measurement point of the LED module under test. Yu Anqi said that this is because other light sources ensure the stability of the ambient temperature of the light source under the premise of ensuring the stability of the power supply, and good repeatability of the test results can be obtained. However, the LED only guarantees that the ambient temperature is stable, and the repeatability of the good test result cannot be obtained, so the temperature measurement point temperature is required.
For the detection method of light, color and electrical performance parameters, the standard stipulates that the LED module should work in the thermal equilibrium state during the test or measurement. While monitoring the ambient temperature, it is better to monitor the operating temperature of the LED module itself to ensure the test. Reproducibility. If it is possible to monitor the LED module junction voltage, the junction voltage should be monitored first. Otherwise, the temperature at the specified temperature measurement point of the LED module should be monitored. It can be seen that monitoring the junction voltage is preferred.
When an external heat sink (including active cooling) is required for operation, the temperature of the LED module itself should be monitored and controlled, because the contact surface of the heat sink of the LED and the heat sink cannot maintain the thermal resistance consistently, so the LED module is monitored and controlled. The temperature of the self can guarantee the reproducibility of the test. The monitoring and control of the LED module's own junction temperature for detection, that is, monitoring the junction voltage conditions to measure light, color, and electrical parameters is the preferred solution to ensure reproducibility.
GB24906-2010/IEC62560 Safety requirements for self-ballasted LED lamps above 50V for general lighting
This standard is equivalent to the IEC standard. The standards and GB16844/IEC60968 self-ballasted fluorescent lamp standards are almost the same as the evaluation terms and methods, because the two methods of use and the possible safety issues are almost the same.
Yu Anqi said that at present, compared with self-ballasted fluorescent lamps, this standard is more difficult to achieve HV type (220V ~ 250V) lamps, through the 4000V dielectric strength test. Because the lamp has good heat dissipation, its heat sink is basically exposed on the outside (accessible parts), LED and heat sink must ensure small thermal resistance, and ensure the thickness and clearance of the insulation layer. All, the current sample lights of multinational companies have not done this. An effective solution is to isolate the circuit or use a highly thermally conductive ceramic material. GB/T24908―2010 performance requirements for self-ballasted LED lamps for general lighting
This standard has more in common with GB/T17263/IEC60969. However, after the standard was formulated, the IEC issued the CPS file of IEC62612 2009. The difference from the standard in China is that in addition to the lumen maintenance test, the no-load high-low temperature alternating test, the switch shock test and the high temperature acceleration test are also carried out. . It should be said that IEC62612 has a more complete assessment requirements. Yu Anqi reminded that in order to export such products in China, we should study this standard as soon as possible, and at the same time, revise the standards that have been promulgated, and develop products according to IEC62612, in order to ensure that such products in China continue to maintain good export capabilities.
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