1 LED power supply module should be greater than 40,000 hours life
In the field of non-lighting applications, long-life power supply design often do not concern, such as: Chargers are unlikely to consumers indicate life size, but in fact, long-life power supply design is what determines the useful life of LED lights. Due to LED lighting, in the finite volume, LED lighting and power placement is very close, and the shared cooling modules, some of the power devices are very sensitive to heat, the temperature will show diminishing life status. For example, the storage capacitor at a high temperature, the internal temperature of the electrolyte showed lipid class speed and exponential correlation, so capacitor brand choice, which should be included in the design considerations due to poor state of the seal will cause capacitor Derivation time earlier than the end of life.
2 LED Power factor (PF) greater than 95% is to obtain government grants and tenders key factor
LED lighting power supply power factor is used to represent the Electrical Products (load) is active with its apparent power ratio. The so-called load is the capacitive, inductive and resistive combinations, in general, purely resistive will approach 1. When the power factor is low, you must:
a. increase the front-end power supply equipment provided by the current;
b. upgrade equipment associated electrical equipment and circuits containing system capacity;
c. increase wear and tear on the line. Thus the overall cost will be upward.
In order to obtain government grants, in addition to considering the relevant performance requirements regulations or specifications, and reached a high power factor is often the key to obtain government tenders.
3 Total harmonic (THD) Distortion <15% >
Total harmonic distortion (THD) is 0, meaning that when the input current and input voltage without any distortion, the waveform will match and no difference in shape (without regard to the phase difference). For now the mains, the general input voltage is a sine wave (Sinusoid / Sine wave).
The waveform can be of different shapes in different proportions and composition of harmonic amplitudes. If multiple sine harmonic combinations can be formed after a class square wave. Generally representatives have repeatedly harmonics distortion is more serious.
Power factor (PF) in addition to being the input current and voltage phase effects, in fact THD and PF also have a very close relationship. We can see from the derivation of the formula which observed that when the more serious when the harmonic distortion, it will affect PF value will become more apparent. In the specification, the more applications than 25W THD subject to class C specification, the application of the THD is less than 25W to meet class D based.
In addition, high frequency harmonic mean rate of change of more of these non-ideal high-frequency component generated by radiation or conduction is possible interference affecting other electrical equipment or interfere with normal operation. Which often takes the luminaire design plus additional shielding, grounding and filtering countermeasures program, resulting in the overall costs.