introduction
Article 2, paragraph 3, of the Ministry of Construction and the National Development and Reform Commission [2004] No. 204 “Opinions on Strengthening Urban Lighting Management and Promoting Energy Conservation Work†proposes that “new lighting projects must be constructed and promoted. Efficient lighting electrical products and energy-saving control technology." According to this spirit, many types of lighting energy-saving devices have appeared in the domestic market. Among them, the most widely used is the intelligent lighting control system with compensation transformer type AC voltage regulator as the core. Its main principle is based on the fact that the gas discharge lamp is not significantly reduced in the range of allowing the pressure reduction, and the lamp is moderately used for the purpose of energy saving. The author will briefly analyze the principle of this kind of lighting control device and its application examples in street lamp design.
1. Compensation principle of transformer type AC voltage regulator
Figure 1 Compensation type non-contact lighting control schematic
Figure 2 equivalent circuit of the compensation Power Supply
Fig. 1 is a schematic diagram of a compensation transformer type AC voltage regulation energy-saving device, and Fig. 2 is an equivalent circuit diagram thereof. Its main principle is to connect a set of transformer coils in the main loop, and use the potential generated by it to superimpose with the main power source to change the output voltage value. The primary winding of the compensation transformer is connected by the electronic power components and the taps of the multi-tap transformer. The electronic power components are responsible for two tasks: 1. The connection of the microcomputer is commanded to be connected to the head. 2. Subdivide the voltage according to the instructions of the microcomputer—that is, adjust the conduction level and change the amplitude of the superimposed voltage to increase the voltage level and the accuracy of each level. If the tap of each stage is 5V, in the range of 5V, we can divide it into 1V/5. Since the adjustment voltage is realized by changing the conduction degree of the electronic component, the parameters such as the phase of the voltage are not changed, so the waveform of the output voltage is not changed after the adjustment.
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