LED lights are currently the secondary glory project and lighting project in the city. It requires the LED maintenance circuit to be very demanding: when the normal operating current is exceeded, maintenance can be started immediately, so that the power supply path of the LED is disconnected, so that both the LED and the power supply can be lost for maintenance, and can be automatically restored after all the lights are normal. Power supply does not affect LED tasks.
The circuit should not be too complicated, the size should not be too large, and the cost needs to be low. So it is very difficult to complete it by fuse. 2. Transient voltage system diode (TVS for short) Transient voltage system diode is a kind of diode-based high-efficiency and maintainable device. When its poles are subjected to reverse transient high-quantity shocks, the high resistance between the two poles can be immediately reduced to low resistance at a speed of minus 12 to the second power of 10 seconds, and it can absorb waves up to several kilowatts. Surge power, clamps the voltage between the two poles to a predetermined voltage value, and effectively maintains the fine components in the electronic circuit. Transient voltage system diode has the advantages of fast response time, large transient power, low leakage current, good breakdown voltage bias, good control of clamp voltage, no damage limit, and small size. However, it is not easy to find TVS devices that meet the required voltage value in practice. The damage of the LED light beads is mainly caused by the current overheating the Ambassador chip. TVS can only detect overvoltage and not overcurrent. It is difficult to grasp the need to select an appropriate voltage maintenance point, such a device cannot be consumed and it is difficult to operate in practice. 3. Selecting a self-recovery fuse A self-recovery fuse is also called a polymer polymer positive temperature thermistor PTC, which is composed of polymer and conductive particles. After special processing, the conductive particles form a chain-like conductive path in the polymer.
When the normal task current passes (or the component is at normal ambient temperature), the PTC resettable fuse is low-resistance; when an abnormal overcurrent passes in the circuit (or the ambient temperature decreases), a large current (or ambient temperature decreases) The heat rapidly shrinks the polymer, which cuts off the conductive path made of conductive particles. The PTC resettable fuse is in a high-resistance form; when the overcurrent (over-temperature form) in the circuit disappears, the polymer cools and the volume returns to normal. Among them, the conductive particles led water proof light fixture reconstitute the conductive path, and the PTC resettable fuse has an initial low resistance form. In the normal task form, the heat of the self-recovery fuse is very small. In the abnormal task form, the heat generation is very high, and the resistance value is very large, which limits the current passing through it, thereby achieving the maintenance effect. Led lighting consumer manufacturer Zhongan Ju can serve you wholeheartedly!
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