A special LED driver for elevator lamp

Abstract

The invention discloses a special LED driver for an elevator lamp, which mainly comprises an integrated chip with a built-in high-voltage MOS transistor, and the integrated chip with a built-in high-voltage MOS transistor is used as a power source for forming voltage control by a control device. The LED driver adopts a wide voltage solution, and can work normally in a voltage range of 85V to 265Vwithout loss of effects; Constant current start, output current accuracy is controlled within 5%, so that the light emitted by the LED lamp has no stroboscopic; Anti-stagger wire, can work normally under 380V high voltage, so that the new elevator installer cannot damage the lamp when connecting the stagger wire, thus reducing the reported loss rate of the elevator lamp; The elevator can work normally at -35 DEG C, and the elevator sent to the north in winter is not affected by low temperature. High switching frequency ensures that the number of times the elevator lamps are switched on and offexceeds 400,000 times; and voltage surge resistance is achieved, anti-conduction and anti-emission circuits are arranged, and thus electromagnetic interference can be effectively prevented.

Description

technical field [0001] The invention relates to the field of LED drivers, in particular to a dedicated LED driver for elevator lights. Background technique [0002] At present, the starting devices of LED lighting commonly used in elevators all use the scheme of reducing voltage by resistance and capacitance: that is, the capacitance of capacitor C1 is used to limit the current. Since the current of the imaginary part of the capacitor has the characteristic of not doing work, it is connected in series in this circuit. Behind the LED particles, the LED lamps emit light. In the circuit, R1 is used to consume the capacity stored in C1 when the power is off, BD1 is used to convert AC to pulsed DC, and C2 and R2 form a secondary energy storage element, which makes the current in this current moderate. In the AC state, R2 is shielded by C2. When C2 discharges, R2 is equivalent to internal resistance, and R3 is connected in parallel with LED to adjust the output current of the cir...

AI Technical Summary

Problems solved by technology

The disadvantage is that the current accuracy is very low, resulting in unstable light emitted by the LED, and there is a very obvious stroboscopic phenomenon; the conversion efficiency is low, and the energy waste is relatively large; the applicable voltage range is narrow, and the work is unstable when using temporary power during the elevator installation process; The ability to resist electromagnetic interference is poor; affected by the conversion efficiency, the power is not large

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