LED sectional dimming circuit
A segmented dimming and LED driving technology, applied in the direction of electric lamp circuit layout, light source, electric light source, etc., can solve the problem that the chip cannot select sampling information, and achieve the effect of simple structure, wide application range and cost reduction.
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[0028] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0029] In order to solve the problems existing in the prior art, the present invention proposes a segmental dimming circuit applied to LED drive circuits. The light circuit can be used in the architecture of various LED driving circuits, making the segmental dimming circuit more practical. The present invention is applied to an AC / DC switching power converter by way of example only, but it should be recognized that the present invention has a wider application range.
[0030] image 3 It is a schematic diagram of the LED driving circuit of the first embodiment of the present invention, and the circuit is an isolated type with PFC function. 301 is AC power supply; 302~305 are bridge rectifiers, 306 is a small filter capacitor (such as 100nF), and the line voltage after rectifying the bridge is a half-wave waveform; 309, 310 are chip startup circuits; 311 is LE...
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