Battery Powered Fluorescent Light Circuit (2)

Figure 286 is a circuit that uses sv rose batteries to light up 6-8W fluorescent tubes. It can be used for
emergency calls during sudden stops at night or for lighting in mobile places without power supply in the wild.
    Transistor VT, capacitor (2), resistor R and pulse transformer T form an auto-coupling oscillator. When the source
j rLi is connected to S, the power source R makes VT forward biased, and the current flows through VT and L., through f. . Coupled to the base of VT
to form JT feedback. The transistor is saturated and conducts, and the well charges the capacitor. When the capacitor (, and both ends are fully charged, VT
is cut off due to the reverse bias of the emitter junction, and the capacitor c. passes through L., L., lU source and R discharge until VT is turned on again and saturated
. Repeat the process described in E to form a rectangular pulse + through the coil)-. After the voltage is applied, the fluorescent lamp tube E is lit.
    VT adopts DD01 high-power silicon transistor, requiring
pVceo≥SW , Vce. ≤0 4v (side test condition: f=1A), the port
value is selected from 10D to 200. The pulse transformer T needs to be homemade:
use E5 type ferrite core, +O. r: imm high strength polyethylene Ester
enameled wire, L: wind 22 turns, L: wind 1 7 turns, L, use
≠0. 21mm high-strength polyester enameled wire, wind 225 turns, connected head
to . The layers are insulated with yellow wax tape, and the cores should be padded A
layer of 0.05mn tissue paper, and then dry the varnish. The designed oscillation frequency
    of this circuit is 5.kHz. When changing the resistance value of R, it will not only change the oscillation frequency,
but affect the operating current of the transistor DD01. When debugging, the current should be set at 0 4 /.
The capacity of the capacitor (1. has a great influence on the oscillation frequency, pulse duty cycle, lamp start voltage, etc. (,
large capacity Hf oscillation The frequency is low and the cut-off time is long. The capacity of C. II is selected at 0.047-O.lyF.
During debugging, "the brightest lamp E under the same operating current conditions is the standard for selection."