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Le Red LED Lamp Beads D Lamp Bead Driver Failure Cause Failure

The LED lamp driver is a circuit that provides LED lamp beads with normal conditions (package voltage, current and other conditions). It is a condition that LED lamp beads are not as good as the quality; Sexual and stability; the important role of the LED lamp bead drive is to convert the input AC voltage source to the output voltage with the current source of the changing voltage of LED lamp beads VF. There are many details in the actual application of LED lamp bead drives to pay attention to. Many problems need to be elaborated and adjusted early to prevent the loss and damage of no need to lose! The effect of LED lamp driver is originally the reason for the effect of drop effects: 1. Do not consider the change of LED lamp bead VF, resulting in low efficiency of the lamp, and even the unstable LED lamp load, which is composed of several LED lamp beads in parallel. = Vf*ns, where NS hints that the number of LED lamp beads connects the number. The VF of LED lamp beads changes with temperature changes. In the case of constant current, VF becomes lower at high temperature, and VF becomes high at low temperature. Therefore, the voltage of the LED lamp bead load at high temperature corresponds to VOL, and the voltage of LED lamp bead load at low temperature corresponds to VOH. When choosing the LED drive, the driver's output voltage range needs to be in VOL VOH. If the selected LED lamp bead driver is lower than VOH, the most old output voltage may cause the maximum power of the lamp at low temperature to reach the actual required power. Maybe the driver outputs the scope of things, the incident is unstable, the lamp beads will flash, etc. However, comprehensive cost and efficiency consideration, it is not necessary to seek the ultra -wide output voltage range of LED lamp drivers: because the driver voltage is only in a certain range, the driver efficiency is the highest efficiency is the highest. After exceeding the range, efficiency and power factor (PF) will deteriorate. At the same time, the output voltage range of the LED lamp bead driver is too wide, which will cause the cost to increase, the efficiency cannot be optimized. Second, the matter of not knowing the LED lamp beads is characterized by the customer's request for the lamp input power to be fixed, and the fixed 5%error can only be adjusted for each lamp to adjust the output current to achieve the specified power. Due to the difference in the environmental temperature and the difference in lighting time, the power of each lamp will still be compared with the difference. Customers make such a request, although there is a consideration of market promotion and business factor. However, the volt and security characteristics of LED lamp beads determine that the LED lamp bead driver is a constant current source, and its output voltage changes with the LED lamp bead load series voltage VO. VO change. At the same time, the overall efficiency of the LED lamp driver will increase after thermal equilibrium. Under the condition of no different output power, compared to the time of booting, the input power will land. Therefore, when the applicant of the LED lamp bead driver should first know the characteristics of LED lamp beads when formulating the needs, to prevent some indicators that do not meet the characteristics of things, and to prevent indicators far exceeding the actual needs, prevent quality excess quality, prevent excess quality And cost waste. Third, without considering the amount of power balance and demand, the nominal power of the LED lamp driver is the data that measures the data under the condition of the rated environment and the rated voltage. Considering that the different customers will have different applications, most LED lamp driver suppliers will provide a power reduction curve on their own product specifications (common with load VS ambient temperature reduction curve and load VS input voltage reduction curve). 4. In the test, the LED lamp driver has purchased many brands of LED lamp beads, but all samples are lost during the test process. Later, after the on -site explanation, it was found that the customer accepted the self -coupling pressure device to power the LED driver directly to test it. After the power was called, the regulator gradually raised from 0VAC to. Such a test operation can easily start and carry the LED lamp bead driver when a small input voltage is started and carried out. This situation will cause the input current to be far from the rated value. , Such as fuses, rectification bridges, thermistor, etc. due to exceeding the current or overheating, resulting in the driver's effect. The correct test is to adjust the pressure regulator to the voltage interval of the LED lamp bead driver, and then connect to the drive of the drive. Of course, the technical improvement design can also avoid the problem of loss caused by the misunderstanding of this test: setting the start voltage limited circuit and the input arrears protection circuit at the drive input terminal. When the input does not reach the starting voltage set by the driver, the driver is not wrong; when the input voltage is reduced to the input arrears protection point, the driver enters the protection state. Therefore, even during the customer testing process, the operation steps of the self -propelled pressure device are still accepted to drive the self -protection effect without the effect of it. However, the customer must know whether the purchased LED lamp driver product has this protection effect before testing (considering the actual application environment of the LED lamp driver, most LED lamp drivers now do not have this protection effect)). V. Different load, Different Test results Different LED lamp driver with LED light testing, the result is normal, when the electronic load test is tested, the result may be abnormal. Any reason for this phenomenon is as follows: (1) The range of the output of the drive of the drive or the power of the power loader of the electronic loader. (In particular, in the CV mode, the test power should not exceed 70%of the maximum power of the load year, otherwise the load may be over -power when loading. ) (2) The characteristics of the electronic loader used are not suitable for measurement of constant streaming, and the vessel voltage gear jumps appear, which makes the driver cannot be normal or loaded. (3) Because the input of the electronic loader will have a capacitance inside the input, the test is equivalent to the capacitance of the drive in parallel in the drive, which may cause the current sampling of the driver. Because the LED lamp bead driver design is to fit the characteristics of the LED lamps, the test pattern closest to actual and real applications should be used as a load with LED lamp beads, and the current current meter and voltage meter should be tested to test. 6. Driver cooling When the driver is installed in a non -ventilated environment, you should try to contact the driver's housing with the lamp case. If the condition allows, apply hot glue or sticker thermal pads on the contact surface of the shell and the shell to improve the heat dissipation function of the driver, so as to thus, thereby Ensure the life of the driver and reliable. Seven, the phase line is wrong. All outdoor engineering applications are all 3 phases and four -line system. Taking the national standard as an example, the voltage between each phase line and the zero line is 220VAC, and the voltage between the phase line and the phase line is 380VAC. If the construction worker connected the driver input to the two phase lines, after power -on, the input voltage of the LED lamp driver exceeds the standard and caused the product to lose efficiency. It is proposed that on the same one -power distribution branch, the switch or circuit breaker should be broken together. Do not place the power distribution fuse on the zero line, and prevent poor contact on the line. 8. The rational range of the power grid fluctuations. When the support of a transformer power grid is too long, when there is a long -term power equipment in the branch, when the start -up and stop of the year -on -year device will fluctuate violently, and even cause the power grid to fail stable. When the grid's instantaneous voltage exceeds 310VAC, the driver may be damaged (even though lightning -proof devices are invalid, because lightning protection device is to deal with dozens of US -level pulse peaks, and the power grid fluctuations may reach dozens of ms, or even hundreds of ms). Therefore, special attention should be paid when there is a long -term power machinery on the street lighting support. The best monitoring of the fluctuation range of the grid under the best monitoring, or the power grid transformer supply power. Nine, the lines frequently stick to the same lights on the same branch road, which causes too much lights on the same branch, causing the load overload on a certain one -phase electricity and the uneven power of each phase, which leads to frequent lines of the line. 10. The following situation that occurs in the following situation will cause LED lamp drivers to damage: (1) AC is received to the DC output terminal of the drive, resulting in the driver's effect; The driver is effective; (3) the constant current output terminal is received with the light adjustment line, resulting in the driver's effect; (4) the phase line is connected to the ground line, resulting in the driver's output without output and the charging of the shell;

Le Red LED Lamp Beads D Lamp Bead Driver Failure Cause Failure 1

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