Energy-saving analysis of intelligent LED lighting control device

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 adopted 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 compensating 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 compensating transformer is connected by the electronic power components to the taps of the multi-tap transformer. The electronic power components are responsible for two tasks: 1. Connect the micro-computer command to the head. 2. Divide 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/block 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.

In Figure 2, the input power terminal is connected in the middle of the tap. When the electronic power unit is connected to the upper tap, the compensation transformer outputs a potential U+ that is opposite to the power supply, canceling the U+ voltage value of the power supply, and the total output is bucked relative to the power supply. And vice versa. The power supply allowable fluctuation range is set to: 184-244V, then the input phase voltage range factor:

KSL=(UL-UB)/UB=184-220/220=-16%;

KSH=(UH-UB)/UB=244-220/220=11%

Where: KSL—low-end regulation range factor; KSH—high-end regulation range factor; UH—allows the highest phase voltage; UL—allows the lowest phase voltage; UB—nominal voltage

From the above formula, the regulator has a voltage regulation range factor of -16% - 11%. When the output voltage is 220V, the input voltage can be stepped down by 36V, boosted by 24V, and the adjustment range is 60V. Similarly, in the energy-saving voltage output (190V) input phase voltage range factor:

KSL=(UL-UB)/UB=184-190/190=-3%;

KSH=(UH-UB)/UB=244-190/190=29%

The voltage regulator's regulated voltage range factor is -3% to 29%. When the output voltage is 190V, the input voltage can be stepped down by 5V, boosted by 55V, and the adjustment range is 60V. Output accuracy:

SU=(UH-UL)/ UB(N+1)=(244-184)/220(9+1)=±2.7%. Where: N - the number of transformer taps, where N = 9.

When the sampling input voltage exceeds the set value, the microcomputer immediately instructs the electronic power unit to switch to the appropriate tap at the non-contact zero-crossing to ensure that the output voltage is stable within ±2%-3% (5V) of the nominal voltage. .

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