| 摘要 |
<p>The utility model provides a light modulation control unidirectional light emitting diode module device. The light modulation control unidirectional light emitting diode module device comprises a unidirectional light emitting diode module portion, a constant voltage portion, a constant power control portion, an amplification portion used for realizing voltage division of the constant voltage and amplification of the division voltage, a reference voltage providing portion used for providing a reference voltage employing output of the constant voltage, an adjusting voltage providing portion comprising a first control voltage output portion used for contrasting the amplified division voltage with the reference voltage to take the one as control voltage output of the constant power control portion, and an error motion prevention portion, wherein if a voltage between the unidirectional light emitting diode module portion and an output end of a rectifier portion is greater than a predetermined level, the constant voltage is kept, the constant power control portion comprises a second switch device which operates at an active area and a saturation area and is used for making the unidirectional light emitting diode module portion keep the constant power; if the voltage of the unidirectional light emitting diode module portion is smaller than a forward voltage decrease value of the unidirectional light emitting diode module portion, the error motion prevention portion makes error motion prevent current from flowing, otherwise, the error motion is stopped preventing the current.</p> |
