Desk lamp battery charging why not directly connected light emitting leds, but to a diode, the diode have what effect
Charging desk lamp is two to 2 v battery combination section two is 4 v battery current also big white leds optimal voltage at about 3 v Scope of work of floating + - 10% plus pressure drop a diode is just 0.7 V power 4 V - 0.7 = 3.3 thus satisfy the white LED lamp working condition No diode LED will be hot Even burned
If animal nickel cadmium or lead nickel-metal hydride batteries, their monomer voltage is 1.2 V, then use two voltage is not enough to push the LED, with three high again, then to string a diode to the voltage
See what the battery, the normal pressure drop of white LED is controlled in 2.8 3.6 V, if use lithium battery 3.7 V voltage is a little high, if he does not limit current will be very big, LED immediately to turn the raw materials.
Ordinary pressure drop with the silicon diode rectifier is about 0.7 V, the series circuit is higher after the voltage sharing the 0.7 V, so your LED can work properly. Can be a little bit, the pressure drop on the diode wasted energy is 0.7/3.3 = 21, see, there are twenty-one percent of the energy contribute nothing.
