There are many kinds of LED lamp protection devices, including LED driver protection,LED open circuit protection of overvoltage, overcurrent, surge current and electrostatic discharge protection,LED drive power supply, high-power LED radiator design. This chapter introduces the working principle and circuit design of various protection circuits in detail.
LED lamps commonly used protection device selection
LED lamp protection circuit can be divided into three categories. The first is the protection circuit inside the LED driver chip.
Such as overcurrent protection circuit, overheat protection circuit, off/automatic restart circuit, front edge blanking circuit; The first
The second type is the external protection circuit of the LED driver chip, which mainly includes the input under-voltage protection circuit and the output over-voltage
Protection circuit, overcurrent protection device (such as fuse tube, self-recovery fuse tube, fuse resistor, etc.), start current limit
Protection circuit, EMI filter, drain clamp protection circuit (or R, C, VD absorption circuit)
Soft start circuit, heat sink, etc. The third type is LED lamp protection circuit.
, safety level of lamps and lanterns
Lamps and lanterns must not only provide good lighting, but also conform to safety norms. Tell concretely, each lamps and lanterns must
Is insulated, all accessible metal parts shall not be live. For live parts in normal operation, must be taken
Insulation measures, add protective cover to prevent human contact with these parts. In addition, leakage in the event of electricity should be avoided
The touching metal part is live