LED drive circuit and projector

Abstract

The invention discloses an LED drive circuit and a projector, and belongs to the technical field of LEDs. The LED drive circuit is applied to a multi-lamp system, wherein an LED drive chip and RGB three-way LED lamps are arranged in the multi-lamp system, and one or more LED lamps are serially connected onto the target circuit of the RGB three-way LED lamps. The LED drive circuit comprises three capacitors, three sampling units, a first switch unit, a second switch unit and a third switch unit, wherein the first switch unit, the second switch unit and the third switch unit are respectively used for controlling RGB three-way LED lamps to be independently turned on or turned off. According to the invention, the voltages at the two ends of the three capacitors cannot be suddenly changed, so that when the switch unit receives the target control signal, the first capacitor, the second capacitor and the third capacitor can be controlled to quickly release the voltage difference generated when the multi-lamp system is switched on so as to avoid the current overshoot phenomenon generated in the process of driving the multi-lamp system by the LED driving chip.

Description

technical field [0001] The invention relates to the technical field of LEDs, in particular to an LED driving circuit and a projector. Background technique [0002] Projector is a relatively common electronic device in people's daily life and study. In the prior art, RGB three-way LED lights are usually used as the light source of the projector, and LED (light Emitting Diode, light emitting diode) driver chips are used to drive The light source of the projector. However, sometimes in order to increase the display effect of the projector light source, one or more LED lights are connected in series on the RGB three-way LED light to adjust the brightness, hue and saturation of the projector light source, that is, the multi-lamp system is used as the light source To adjust the display effect of the projector light source. Among them, the conduction voltage of the RGB three-way LED lamp is about 3~4.5V, and the overshoot current is within 1A, while the series conduction voltage ...

AI Technical Summary

Problems solved by technology

Among them, the conduction voltage of the RGB three-way LED lamp is about 3~4.5V, and the overshoot current is within 1A, while the series conduction voltage of the multi-lamp system is generally above 7V, and the overshoot current when the multi-lamp system is switched will reach More than 10A, which far exceeds the upper limit of the current that the LED lamp can withstand, and thus leads to a great potential safety hazard for the LED driver chip

At present, there is no effective solution to this technical problem

Images