What is the role of the PF value of the LED light, that is, the power factor?
The LED tube light power supply is a very important part in the light tube, also known as the driver. The quality of the power supply directly affects the service life of the LED light. The LED tube power supply is also called the soul of LED tube lights by industry insiders. One of the parameters is called the power factor or PF value, which is of great significance to the power supply:
What is power factor: Power factor is the cosine of the phase difference between voltage and current. Because the current and voltage are both wave diagrams, one is a sine diagram and the other is a cosine diagram; since the two waveform diagrams differ by 1/4 cycle (ie: 90 degrees), the PF value is formed. In order to improve the PF value, it is necessary to A correction circuit is added to the power supply, so the cost of the power supply with a high PF value is relatively higher.
The PF value without PF correction circuit is generally around 0.6, and the PF value with PF circuit can basically reach around 0.9 or even higher. What is the specific performance in the LED tube? Looking at the power meter, under the same power, the higher the PF value, the lower the current consumed, on the contrary, the lower the PF value, the higher the current consumed. important energy saving indicators.
This means: PF value is also an energy-saving indicator. Some cheap LED lights have a power factor of less than 0.5. We call it no PF. Of course, the energy-saving effect will be discounted. When the PF value is low, it will pollute the power grid of the entire power supply system. When the PF value is low, the utilization rate of electrical equipment to the power grid will become lower, so the country has PF value requirements for some high-power electrical equipment.
The power factor of a good quality LED tube, that is, the PF value, can be 0.95-0.98.
We can show it from the power meter, the same is 18w, 220v, the power factor is 0.95, and the AC current shows 85ma. However, under the same conditions, when the power factor is 0.5, the AC current becomes as high as 130ma. That is, the same 18w, high power factor led lights use less current, that is, lower power consumption. It can be seen from this point that the power factor also affects energy saving. This statement, we can also explain its principle from the electrical formula. P (power) = U (voltage) * I (current) * cosA, where cosA is the power factor. When the power is constant, the voltage is the same. Then the current is inversely proportional to the power factor. This is also proved from the formula. Thus proving the importance of power factor.
Power factor benefits
In order to improve cost-effectiveness, the power supply department requires users to increase the power factor. What are the benefits of increasing the power factor to the user side?
1. Ensure a good power factor value, thereby reducing the voltage loss in the power supply system, making the load voltage more stable and improving the quality of electric energy.
2. By improving the power factor, the total current in the line and the capacity of electrical components in the power supply system, such as transformers, electrical equipment, wires, etc., are reduced, so not only the investment cost, but also the loss of its own electric energy is reduced.
3. It can increase the margin of the system and tap the potential of power generation equipment. If the power factor of the system is low, under the condition that the capacity of the existing equipment remains unchanged, after installing the capacitor, the power factor can be improved and the capacity of the load can be increased.
Compensation method for improving power factor
Ways to increase PF value
The measures to improve the power factor by using the equipment supplying reactive power to compensate the reactive power required by the electrical equipment is called the compensation method of improving the power factor. To use the compensation method to improve the power factor, it is necessary to add new equipment and increase the demand for non-ferrous and ferrous metals. In addition, the compensation equipment itself also has power loss, so from the overall point of view, the method of improving the natural power factor of the electrical equipment should be adopted first.
Improving the power factor will inevitably promote the country's energy utilization and the economic benefits of enterprises. It is an indispensable condition to ensure the power quality, voltage quality, network loss reduction and safe operation of the power system. Corresponding measures should be taken according to different situations to improve power. factor, reduce reactive power loss, thereby improving economic efficiency.
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