When The Phone Battery Out Suddenly Without Electricity

May 28, 2010 - PRLog -- To solve this problem,

this paper describes a solar cell phone battery charger that uses solar panels by DC voltage

transformation circuit to recharge cell phones, and can automatically stop after charging the battery
http://www.global-e-world.com/Touch-Screen-LCD-Monitor/

charging.
Circuit works
Solar cells in use are too large changes in the sun, its internal resistance and relatively high, the

output voltage instability, the output current is small, which requires transformation with a direct

current voltage conversion circuit for the cell phone battery charger, dc converter Figure 1, which is

a single tube DC converter, single-ended flyback converter circuit form. When the switch VT1

conduction, the high-frequency transformer T1 primary winding NP of the induced voltage is a positive

2 negative, secondary coil Ns of 5 is 6 negative, rectifier diode VD1 is off, then high-frequency

transformer T1 through the primary coil Np stored energy; when the switch VT1 end, the secondary coil

Ns of 5 6 is negative, high-frequency transformer T1 energy stored in capacitor C3 by VD1 filtered

rectifier, and output to the load.
http://www.global-e-world.com/LCD-Monitor/

VT1 turn, the transformer primary coil Np on the plus input DC voltage, the collector current Ic in

the Np in the linear growth, the feedback loop is 4 3 Nb produce negative induced voltage to be based

VT1 is extremely positive and extremely negative emission positive feedback voltage, this voltage by

C2, R3 to VT1 VT1 injection base current to the collector current is further increased, the positive

feedback generated an avalanche process, so that VT1 saturated conduction. During the saturated

conduction in the VT1, T1 stored magnetic energy through the primary coil Np.
Meanwhile, the induced voltage to the C2 charge, with the higher charge voltage of C2, VT1 base

potential decreases gradually, when the VT1 of the base current changes can not meet their continuing

saturation, VT1 out into the amplification saturation.
http://www.global-e-world.com/Digital-Photo-Frame/

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