What protects the LED from over supplying of voltage?

Several circuit protection technologies – including metal-oxide varistors (MOVs), TVS diodes, LED protectors, and fuses – are needed to provide overvoltage, overcurrent, and high-temperature circuit protection for commercial LED lighting systems.To protect LEDs from too much current, you can use a current-limiting resistor in series with the LED. The resistor will limit the amount of current flowing through the LED, preventing it from being damaged.Today qihe smt pick and place machine sharing what protects the LED from over supplying of voltage?

Here is not just the LED power supply, each product has its own set of maintenance methods, so how to know the LED power supply? The LED power supply is a type of power supply. It is a device built to supply power to electronic equipment. Called the power supply, it supplies lighting electrical energy and supplies the electrical energy required by all components in the computer. Regarding the maintenance mode, you must know its transition circuit, overshoot circuit, overvoltage circuit, and pass-through circuit.

overcurrent circuit

overcurrent circuit: First of all, you must know that when unexpected conditions such as load short circuit, overload, or control circuit failure occur, it will cause excessive current flowing through the switching tube, causing the tube to increase power consumption and generate heat. If there is no overcurrent protection, If installed, the high-power switching tube may be damaged; failure of the regulating circuit may also cause overcurrent damage to the LED. Overcurrent protection usually uses sampling resistors or Hall sensors to check and compare to achieve protection, but they all have the disadvantages of large size and high cost.

overshoot circuit

overshoot circuit: Because the steady-flow switching power supply easily causes current overshoot when starting up and shutting down, loads such as LEDs are not allowed to have ms-level current overshoot, so the impact of a large current in an instant has May damage LED equipment.

overvoltage circuit

overvoltage circuit: If the load of a stabilized current power supply is disconnected, the voltage across the current check resistor drops to zero. Once the given value is not zero, the regulator will cause the output voltage to surge sharply to the maximum value, which will cause the load to be connected It is very risky when there is poor contact. For loads such as LED and semiconductor refrigeration, when overvoltage occurs, the first task is to protect the load, followed by the protection of the switching power tube.

pass-through circuit

pass-through circuit: Half-bridge and full-bridge are common topological structures of switching power supplies, and “pass-through” poses a great threat to them. Pass-through is a phenomenon in which two transistors on the same bridge arm are turned on at the same time at the same time. During the commutation period, the switching power supply is susceptible to interference and causes shoot-through. Excessive shoot-through current will damage the power electronic equipment used for inversion. Once a straight-through phenomenon occurs, it must be detected quickly and the drive must be turned off immediately to prevent the PN junction of the switching device from accumulating excessive heat and burning out.

In order to solve the above problem, we have two protection methods that can be used together. One is to place a bidirectional TVS to protect the instantaneous impulse voltage. In addition to these models, the quality and service of LED power supplies are our primary focus.

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