Bluergo represents a supplier of AC/DC power supplies for all those realities that intend to integrate them into their cards, since they are characterized not only by the optimization of electrical parameters but also by the reliability and the strict compliance with regulations, both for the electrical safety and noises.
Bluergo’s mission is the design, production and marketing of electromagnetic components such as stators for stepper motors, small-medium power inductors and transformers. The company has always been committed to the care of the “green” aspect of products, to the extent of introducing a line called “Le@f”, characterized by low losses, with RoHS components and processes. Concerning this, the natural evolution of this process is the low-medium power design of SMPS (Switch Mode Power Supply).
This type of power supplies, whose operation principle has been known for a long time, provides the advantage of having smaller sizes and higher efficiencies than conventional configurations. However, the fact of generating a square wave with frequency of several dozens of kHz, levels of hundreds of Volts and rapid switching fronts causes the formation of undesired high harmonic contents that can be source of noise for close equipment. This aspect implies a high criticality in terms of both conducted and irradiated emissions, with the consequence that a relevant part of the cost is due to the filtering of noise signals. It is necessary to pay attention to this aspect in the drawing up of the card layout as well.
From the simulation to the tailor-made product
In this context Bluergo operates as supplier of AC/DC power supplies for all those realities that intend to integrate into their cards an equipment of this kind, characterized both by the optimization of electric parameters, like efficiency, and by the reliability and the rigorous conformity with the regulations concerning electrical safety and noises. For this reason, any design starts with an accurate simulation of parameters, using the tools made available by primary suppliers of semiconductors, then proceeding with tests on prototypes, the thermal measurement, and the examination of the most critical components and the compliance, according to certified Bodies, with the relative Cenelec regulations.
The company’s projects, in the wake of the above-mentioned “green” propensity, stand out for the conformity with European Community’s conduct code about energy efficiency.
The goal of these prescriptions is on one hand the optimization of the power supply efficiency, to minimize the power loss, and, on the other hand, the drastic consumption reduction in stand-by conditions, where no load absorption is registered. Concerning this aspect, it is worth highlighting that since last January the limits fixed for the no-load absorption have been 0.075 W for output powers included between 0.3 and 49 W, and 0.15 W for powers included between 49 and 250 W.
Concerning efficiency, parameters are instead summarized in the following table, where the limits are differentiated depending on whether it is low voltage (inferior to 6V) or not.
| Power | Low voltage | Excluding low voltage | |||
| Full load | 10% load | Full load | 10% load | ||
| 1W≤P≤49W | ≥0,0834*ln(P)-0,0014*P+
0,609 |
≥0,0834*ln(P)-0,0014*P+
0,509 |
≥0,071*ln(P)-0,0014*P+
0,67 |
≥0,071*ln(P)-0,0014*P+
0,57 |
|
| 49W≤P≤250W | ≥0,88 | ≥0,78 | ≥0,89 | ≥0,79 | |
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