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LED light as a green,
energy saving, energy saving, long life and the sudden emergence of
fourth-generation lighting, wide attention, the rapid development of
wildfire. The current LED light source is a low-voltage (VF = 2 → 3.6V),
high current (IF = 200 → 1500mA) the work of semiconductor devices,
must provide a suitable DC current to the normal light. Direct current
(DC)-driven light-emitting LED light source technology has become
increasingly mature, and because we use everyday lighting is a
high-voltage AC power supply (AC 100 ~ 220V), so you must use the
technology to get relief with lower voltage, commonly used is the
step-down transformer or a switching power supply, then the exchange of
(AC) converted into direct current (DC), and then converted into DC
current source in order to promote LED light source light. Therefore,
DC-driven LED light source system application program must be:
transformer + rectifier (or switching power supply) + constant-current
source (Figure 1). LED lamps inside must have a certain amount of space
to accommodate the module, but for E27 standard screw of the lamp is
very limited space, it is difficult placement. Through either a
transformer + rectifier or a switching power supply step-down, the
system will have a certain amount of wear and tear, DC LED in the AC, DC
when converting between about 15% to 30% of the electricity has been
loss, system efficiency is difficult to achieve over 90% . If you can
use AC (AC) direct-drive light-emitting LED light source, the system
will greatly simplify the application programs, system efficiency will
be very easy to achieve over 90% |
