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555 Inductive battery charging circuit

2016-05-12 00:42  
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555 Inductive battery charging circuit
As shown in Figure 9-40, 555 and R1, R2, C1 form an astable multivibrator, f = 1.44/ (R1 +2 R2) C1, the oscillation frequency of the icon parameter is approximately 10kHz. The oscillation square wave is added to the primary L1, secondary L2 of inductively coupled coil, and two nickel-cadmium batteries are mounted in the dielectric plexiglass shell, that is, it uses inductive charging method. The core of coil antenna uses φ10 magnet bar of radio, it uses φ0.13mm and φ0.27mm wires with 200turns on the primary and secondary coils, the middle is cut and connected in the both sides of dielectric plexiglass panels. Battery charging current is up to 10mA, when it is charging, LED is lit.