Do LED lamps need to use a ballast?

Do LED lamps need ballasts? No, but there is no problem.　　 Let's make the final conclusion: LED lamps generally have a built-in constant current drive power supply, so LED lamps do not require ballasts. The inductive ballast can remain in the circuit, which is equivalent to being connected in series with the LED lamp, which will consume about 0.1W-0.5W of power; if it is an electronic ballast, it must be removed, if the electronic ballast is directly connected to the LED Lamps, generally will cause the LED lamps to be damaged immediately. Led lamps are the same as other LED lamps. They all rely on LED lamp beads to emit light. LED lamp beads require a DC constant current drive. Generally, LED lamps require an LED driver to supply a constant DC current, referred to as LED constant current source. In essence, most LED drivers are all a DC switching constant current source. Ballasts are used in cooperation with fluorescent lamps. There are two types: inductive (to cooperate with the starter) and electronic. The main purpose is to supply high voltage when the fluorescent lamp is started, and to limit the current when the fluorescent lamp is in normal operation (the so-called ballast). flow). Inductive ballast is essentially a large inductor with an inductance value of about 1H. A large iron core is wound with several turns of copper enameled wire. Together, the enameled wire has resistance. Generally, the inductance value of the ballast for a fluorescent lamp of about 40W is about 45 ohms. , So the inductive ballast is equivalent to a 1H inductor plus a 45 ohm resistor. The electronic ballast circuit is relatively complicated, but its primary function is still the same as the inductive ballast and starter. It supplies high voltage when starting to make the fluorescent lamp break down. After starting, the current is limited during normal operation, but the electronic ballast is no longer needed. starter. The electronic ballast output to both ends of the lamp is a high frequency (about 25-45kHz) and high voltage (about 330V-450V) power supply. If it is directly connected to the two ends of an ordinary LED lamp, it will immediately cause damage to the front of the LED lamp driver, and may be damaged The process is accompanied by noise and smoke, which is more dangerous.