networks has grown substantially. Sometimes, this has made
wireless systems overly complicated for users. Let’s examine a
typical example: A user is streaming a film via their home WiFi
system to a tablet, while switching on the living room light with
a wireless switch. As both applications use the same frequency
band, the switch signal must wait until there is a free slot, and
the light might not come on for several seconds. On the other
hand, the streamed video image might become distorted the
moment the light switch is pressed. This is not exactly what
consumers expect from state-of-the art technology.
Led Drivers – The Underestimated Core Component
LED drivers need to be compatible with as many systems as
possible. In addition, manufacturers face the challenge that a
new LED model is brought to the market nearly every week.
Unfortunately, these new products often come with custom
current/voltage combinations. Manufacturers of LED drivers
thus face the problem that virtually every LED model requires a
special LED driver. Developing matching LED drivers for each
and every new product in the market is obviously not sustainable,
as only large production volumes can keep prices down. What is
required is a universal solution.
When looking at the problem from a different angle, we can
see that such a solution might just be within our grasp. How
about a LED driver that does not produce a constant current
(CC) or constant voltage (CV), but adapts the output to the
connected LED? To achieve this, we need to further develop the
principle of constant power.
Conventional LED drivers are controlled on the basis of the
measured secondary side current (CC) or voltage (CV). These
measurements are fed back to the primary side control IC that
actuates the primary switcher.
Fig. 3: Simplified block diagram of a self-calibrating LED driver with
microprocessor and active PFC flyback controller.
Modern measuring technology, however, allows for accurate
measurement of the actual LED characteristics. To use this
information, we need a secondary side sensing circuit that
measures the voltage relative to a variable output current
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