It is well known that in the LED lighting market, the power supply atmosphere is isolated and non-isolated. Non-isolated designs are limited to dual-insulation products, such as replacements for light bulbs, where the LED and the entire product are integrated and sealed in a non-conductive plastic, so the end user does not have any risk of electric shock. Secondary products are isolated and relatively expensive, but they are essential where the user can access the LEDs and output wiring (usually in the case of LED lighting and street lighting applications).

Lightning is a natural phenomenon of nature, especially in the south with abundant rain. Lightning strikes are divided into indirect mines. Indirect, the losses caused by thunderstorms are enormous. Lei mainly includes direct lightning, conducted lightning and inductive lightning. Because the energy impact caused by direct lightning is very large, the destructive power is extremely strong, and the general power supply cannot be tolerated. So let's talk about the effects of conducted lightning and inductive lightning on the drive power. The surge impact of a lightning strike is a transient wave, a transient disturbance that can be either a surge voltage or a surge current. Transfer to the power line along a power line or other path (conducting lightning) or by an electromagnetic field (inductive lightning). Its waveform characteristics are first rising rapidly and then slowly decreasing. This phenomenon can have a fatal effect on the power supply, because the instantaneous surge shock generated by it far exceeds the electrical stress of the general electronic device, resulting in direct damage to the electronic components.

Brighr star LED lamp driver: What is the terminology of the LED light driver industry? The Led drive power supply is a power converter that converts the power supply to a specific voltage and current to drive the LEDs to emit light. So how many technical terms do you know as a member of the led lighting industry? Let's learn together. Http://www.sz-msd.com/ 1. LED driver for lighting lighting LED Driver LED control and power supply for lighting. 2, rating rating The drive has its specific value under specified operating conditions. 3, rated input voltage input voltage rating The drive's specific input voltage under specified operating conditions. Take 220V in this specification. 4, rated output power output power rating The drive's specific output power under specified operating conditions. 5, start time turn ON time AC power is applied to the constant current output rated current (or constant voltage output rated voltage) for 90% of the established period of time. 6, overshoot amplitude overshoot The phenomenon that the output DC voltage or current exceeds a stable value due to a certain amount of transient is an overshoot. The overshoot amplitude is the maximum transient amplitude of the output current or deviation from the stable value. 7, load adjustment rate load STability The relative amount of change in the constant current driver output current (or constant voltage driver output voltage) due to load changes while all other influences remain constant. 8, input voltage regulation rate The relative amount of change in the constant current driver output current (or constant voltage driver output voltage) due to changes in the input voltage while all other influences remain constant. 9, output voltage ripple and noise Output Ripple & Noise The peak-to-peak value of the AC component included in the output DC voltage. 10, input impulse current input inrush current The maximum instantaneous current value of the AC input circuit when the power is turned on. 11, the highest case temperature maximum case temperature tc The maximum surface temperature of the enclosure when the drive is allowed to operate. 12, the highest ambient temperature The highest ambient temperature to ensure that the drive is working properly. 13, creepage distance creepage distance The shortest path between two conductive parts measured between the conductive surfaces or between the conductive parts and the device's protective interface. 14. Clearance ELectrical clearance The shortest spatial distance measured between two conductive parts or between the conductive parts and the equipment protection interface. 15. Dielectric strength Dielectric strength means that when a voltage is applied to a medium, when the voltage exceeds a certain limit value, the current through the dielectric increases sharply, and the dielectric properties of the dielectric are destroyed. This phenomenon is called dielectric breakdown, and the voltage at this time is called The breakdown voltage, the corresponding electric field strength is called the dielectric dielectric strength. 16, double insulation double insulation Insulation consisting of basic insulation plus additional insulation. 17, reinforced insulation A single insulation structure that provides protection against electric shock equivalent to double insulation under the conditions specified in this specification. 18, flashover flashover A destructive discharge of a gas or liquid medium along an insulating surface under the action of a high voltage. The voltage at the time of discharge is called a flashover voltage. After a flashover occurs, the voltage between the electrodes drops rapidly to zero or close to zero. The spark or arc in the flashover channel causes localization of the insulating surface to cause carbonization, which damages the surface insulation. The discharge along the surface of the insulator is called flashover. 19, stroboscopic flicker free When the driving power supply is normally connected with the LED lamp, use the camera of the mobile phone to align the LED light, and the screen of the mobile phone will flash bright and dark. This is called strobe. Strobe is harmful to the human body and is directly related to the drive power. 20, surge current surge current Surge current refers to the current characteristics of the electrical equipment at the moment of switching, and is important for the safety of the power supply network and the electrical equipment. 21, varistor Voltage Dependent Resistor The varistor is mainly used for voltage clamping when the circuit is subjected to overvoltage, absorbing excess current to protect sensitive devices. 22, safety regulations Safety regulations are the requirements for product safety in product certification, including the safety requirements of product parts and the safety requirements after forming finished products.

In order to make the LED drive power supply waterproof, we generally seal the electronic components by filling glue. The glued material is generally made of silica gel and epoxy resin. Silicone is cheap, has good air tightness, strong adhesion and high hardness. But it is easy to turn yellow and not tolerate temperature. Epoxy resin is resistant to high temperature, can be reflowed, is not easy to yellow, and has stable performance. However, it has strong water permeability, low hardness and high price. We should choose different materials for different types of customers.

With the rapid development of road traffic construction in China, the construction scale and quantity of highway tunnels are also getting larger and larger. Tunnel lighting has also emerged as problems such as energy conservation and safety. With the maturity of LED light source technology, domestic The lighting industry has also carried out the research and application practice of LED in highway tunnel lighting. Therefore, combining advanced control methods in tunnel lighting, using a new generation of light source with high luminous efficiency, good stability and long life will become a demand. And trends