Universal intelligent switch design based on LED lighting
1 Introduction
With the development of China's economy and society, lighting power consumption has accounted for 10% to 12% of total electricity consumption. Lighting energy conservation has become an important aspect of energy conservation and environmental protection. The purpose of lighting energy saving is to reduce the energy loss in the lighting system and to make the most efficient use of electric energy under the premise of ensuring the lighting scale and lighting quality.
The mainstream lighting energy-saving technologies include energy-saving lighting sources (such as LED lighting) and energy-saving circuits (such as dimming circuits, energy-saving switches), and the comprehensive application of these two technologies is a new trend of lighting energy-saving technology. In China, LED lighting equipment has good development prospects, but the existing energy-saving circuit technology generally has the following two shortcomings:
(1) Most of the dimming circuits are composed of chips such as single-chip microcomputers, and the cost is high, which is not conducive to installing and replacing the original circuits;
(2) The energy-saving circuit is relatively complicated. When installing related equipment, it is necessary to make major modifications to the original lighting system in indoor or other application places. The installation and maintenance costs are high and the implementation is difficult.
In view of the above shortcomings, this paper designs and implements a general-purpose intelligent switch with low cost, miniaturization, environmental protection, energy saving, easy installation and maintenance for LED lighting equipment, using simple components commonly used in analog and digital circuits.
2. System circuit and working principle
2.1 Working principle
The LED intelligent switch designed in this paper mainly includes two parts: intelligent control circuit and intelligent dimming circuit, as shown in Figure 1.
The intelligent control circuit interface C and D are connected to the control circuit which can be turned on and off according to the illumination intensity. The control is mainly completed by the thyristors D1 and D2. The intelligent dimming circuit interfaces A and B are connected to change the thyristor with the light intensity. The control circuit of the conduction angle. The working principle of the intelligent switch is shown in Figure 2.
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