A light source drive circuit and a control circuit for controlling the power of the light source

Abstract

The invention discloses a light source drive circuit and a control circuit for controlling the electric energy of the light source. The light source includes a first plurality of light-emitting diodes and a second plurality of light-emitting diodes. The light source receives a DC voltage. When the DC voltage is within a first preset range, the control circuit only makes the first plurality of light-emitting diodes emit light; When within the two preset ranges, the control circuit makes both the first plurality of light emitting diodes and the second plurality of light emitting diodes emit light, and the total power of the light source is substantially constant without being affected by changes in the DC voltage. The light source driving circuit and the control circuit for controlling the power of the light source provided by the present invention can improve the conversion efficiency of the light source driving circuit in a flexible manner, and the state alternation is imperceptible to the naked eye for the user, so the power of the light source is substantially constant and not The light source flickers.

Description

technical field [0001] The invention relates to a driving circuit, in particular to a light source driving circuit and a control circuit for controlling the electric energy of the light source. Background technique [0002] Light Emitting Diodes (LEDs) are used in many fields such as general lighting. LEDs offer several advantages over traditional light sources such as fluorescent and incandescent bulbs. For example, LEDs have relatively low power consumption. Traditional light sources such as incandescent bulbs use most of their electrical energy to heat a metal filament to a temperature high enough to emit light. In contrast, LEDs generate almost no heat and consume only a fraction of the energy to produce light with the same brightness as incandescent lamps. For example, in a light bulb application, an incandescent light source consumes about 60 watts of power to produce the same brightness, and an LED light source can produce the same brightness as long as it consumes...

AI Technical Summary

Problems solved by technology

[0005] However, the disadvantage of this driving circuit is that as the input voltage increases (for example, from 210V to 250V), the conversion efficiency of the light source driving circuit decreases significantly (for example, from 84% to 71%)

That is to say, in the case of a large input voltage, it will lead to problems such as large power loss and poor heat dissipation.

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