Linear dimming method based on microprocessor
A microprocessor and linear dimming technology, applied in the field of dimming, can solve problems such as large electromagnetic interference, limited control accuracy, and brightness changes
Inactive Publication Date: 2016-06-15
SHANGHAI SINO SAGE INTELLIGENT TECH CO LTD
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Problems solved by technology
However, when this dimming control method works under the normal module drive of fluorescent lamp ballasts or LED conventional switching power supplies, due to the use of thyristor chopper circuits, it will cause continuous large electromagnetic interference, and due to voltage fluctuations Under certain conditions, the phase angle will fluctuate and lead to changes in the brightness of the lamp. The control methods all use analog control, so it cannot be controlled linearly, and the control accuracy is also limited.
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[0011] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0012] see figure 1 , in an embodiment of the present invention, a linear dimming method based on a microprocessor includes a rectification part, a zero-crossing detection part, a control part, a controlled part and a load part. The zero detection part detects the zero-crossing point of the alternating current, and the control part detects the zero-crossing signal and performs timing, and outputs a signal to control the controlled part, so that the load part i...
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The invention discloses a linear dimming method based on a microprocessor. The linear dimming method comprises a rectification portion, a zero-cross detection portion, a control portion, a controlled portion and a load portion. The rectification portion is used for rectifying commercial power into forward power; the zero-cross detection portion is used for detecting the zero crossing point of an alternating current; the control portion carries out timing after detecting a zero crossing signal and outputting a signal to control the controlled portion to enable the load portion to be controlled to work; the control portion adopts the microprocessor MCU for controlling; and the controlled portion adopts a silicon controlled rectifier. According to the two-line linear LED lamp dimming control method, the microprocessor MCU judges the work frequency of the alternating current, and calculates the time of the zero crossing point by detecting the AC input voltage phase angle, and thus on / off state of LEDs in the corresponding sections can be controlled.
Description
technical field [0001] The invention relates to a dimming method, in particular to a microprocessor-based linear dimming method. Background technique [0002] Fluorescent lamps and LED lamps are widely used in homes, hotels and other occasions, and are currently important energy-saving light sources in the context of energy conservation. At present, the dimming technology of lamps is divided into two categories, one is four-wire dimming, such as the dimming of DALI system, this method can carry out addressing and precise control, but requires the user to reconfigure the control line. The other is to use two-wire dimming, such as thyristor dimming. However, when this dimming control method works under the normal module drive of fluorescent lamp ballasts or LED conventional switching power supplies, due to the use of thyristor chopper circuits, it will cause continuous large electromagnetic interference, and due to voltage fluctuations Under certain conditions, the phase ang...
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IPC IPC(8): H05B33/08H05B44/00
CPCH05B45/50H05B45/395H05B45/00Y02B20/30
Inventor 曹磊
Owner SHANGHAI SINO SAGE INTELLIGENT TECH CO LTD