Power outage emergency light circuit (4)

Figure 284 is a practical power outage emergency light . Its characteristic is that only when the light is turned on, in the event of a sudden power outage
. Only the spare fluorescent lamps will be turned on for emergency lighting. If there is a power outage while the lighting lamp is off, the backup
lamp will not light up.
    In the figure, E] is an ordinary lighting lamp, and s is the lighting switch. When s is turned off, E1 goes out. At this time, the voltage regulator
tube VS2 is in a cut-off state. VT2 is cut off because there is no base bias current, and the relay K does not operate. When the moving and closing contact k1
is open, VT3 works briefly and the fluorescent lamp E2 does not light up. If there is electricity in the grid, switch S on the platform, and 220V AC power
is supplied to the lamp F1 through the VD2-V1)5 bridge full-pass rectifier, which can make El turn forward and light up. The voltage at both ends of E1 passes through
R, and the voltage is reduced, current limited, and stabilized by VS2, and the output 7 SV DC voltage passes through R. Added to the base of PNP symbol VT2,
its reverse bias is cut off, so the relay still does not operate. At the same time, the AC power is stepped down by the transformer T], Vn1 is rectified
, and a simple constant voltage charging circuit composed of VT1 and VS1 charges the battery C. If there is a sudden power outage at this time,
VT1 will cut off and stop outputting charging current, and at the same time c. The stored charge is quickly discharged through R, E1 and S. At this time
(, it can pass through the Vl, 2 emitter junction, R, R, E1 and S to form a discharge circuit, so VT2 is quickly turned on, and
the relay K is Electric suction table, contact k 1 is closed, the inductive three-point oscillator composed of VT3 is energized and starts to oscillate,
the oscillation frequency is about iookHz, this oscillation current is boosted by T2 to make the fluorescent lamp E2 light up quickly for emergency lighting
,
    VT1 is 8050
Medium power silicon tube, mouth
≥ 100; Vl, 2 use
9 () 15 square silicon tube, require
mouth ≥?OO: VT3
can use 3DD12A,
3DD15A and other silicon
low frequency high power tube,
25.
It should be installed as Install an aluminum heat sink plate of 70nun
× 40mm × 2mm
. Tl is 22()V, 6 3V, 5VA small high-quality power transformer, which requires long-term power supply/
heating. 'r2 needs to be made of white: use ferrite with a diameter of ≠22mm Magnetic tank, L. Use ≠In.m high-strength enameled
wire to wind 9 turns flatly on the frame, /,, use ≠3mni high-strength enameled wire to flatly wind 8 turns outside L., L. Use
40. 2rnm l island The strength enameled wire is wound around the frame for 200 turns. A small amount of insulating paper should be added between L. and L.
(insulating paper in a paper container can be used) to prevent breakdown and ignition during use. , and soaked in varnish
, wait until the paint T is transparent. K uses JZC-22F, DC6V small medium power electromagnetic relay. E2 can
use 8w fluorescent tube. G is 6V, 4Ah maintenance-free cyanine battery.
    Inductor three-point oscillation The device needs to be adjusted appropriately. Dong RP can change the brightness of the lamp E2. If the lamp
does not light up, the circuit will not vibrate. It may be that the two wires of the coil r... or /: are connected in reverse. Just connect the I... Just swap the ends of the two threads
and it will snap.