LED constant current drive circuit with light dimming function
A technology of constant current drive and constant current power supply, applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve the problem of low efficiency, and achieve the effect of high efficiency and high dimming precision
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[0015] see figure 1 , The drive circuit includes an LED constant current power supply circuit 1 , an analog LED current regulation circuit 2 and a digital LED current regulation circuit 3 .
[0016] The LED constant current power supply circuit 1 has a power supply circuit composed of DC power supply Vin, LED, energy storage inductor L, current sampling unit and current switch G connected in series and connected in parallel in the series section of LED, energy storage inductor L, and current sampling unit A unidirectional conduction diode D on the top, wherein the current sampling unit can use a sampling resistor R, or a transformer, the LED can be an LED lamp or a plurality of LED lamps connected in series, and the current switch G High-power switching tubes such as MOSFETs can be used.
[0017] The analog LED current regulating circuit 2 includes an upper threshold generation circuit VR2 and a lower threshold generation circuit VR1, a comparator circuit and a pulse width m...
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