One, working principle
The circuit of lamp of short time lash-up is shown 1 times like the graph. H is fluorescent lamp of low pressure of small-power cold cathode. After circuit receives electrified wire netting, resistor of classics of report of 220V communication town diode of R1 current limliting, crystal VD after half commutate, capacitor two upright voltage fill C to be controlled to 290V, through current limliting resistor at the same time R2 ignites fluorescent tube H. After power cut, the charge that capacitor C place stores continues through R2 to H power supply, make fluorescent tube delay time is lighted bright. Through period of time (make an appointment with 1min) , two end of C spark voltage drops to be controlled to 160V, tube just goes out automatically.
In circuit, the time length that tube delay time illumes and C capacity and size of R2 block value are concerned. When C=330μF, delay time time can amount to 1.5min; Increase R2 block value to also can increase delay time time, but the accretion that is worth as R2 block, tube brightness will be remarkable abate.
2, yuan choice of parts of an apparatus
H chooses fluorescent lamp of low pressure of homebred 3W Leng Yin (the appearance refers to a graph 2) . This kind of tube by inner tube the canal outside mixing is comprised, inner tube is discharge to be in charge of, went up in besmear of the wall outside inner tube a pervious to light SnCI4 resistor layer in order to replace ballast, in fluorescent material of the besmear on the wall of inner tube, different fluorescent material can receive different glow facial expression. The biggest characteristic of this kind of fluorescent tube is: Fire telegram of electric depress, Yi Qihui, bad news province, do not need ballast. It is facilitating installation, must deserve to go up for tube the lamp holder of type of card mouth low base with commonly used lighting circuit.
VD chooses diode of 1N4007 silicon commutate. C uses the 220μF with commonly used circuit of source of colour television Electromechanical, 400V to electroanalysis capacitor. R1 uses resistor of RTX-1/2W carbon film, r2 uses resistor of RTX-1/4W carbon film. XP makes work with city two pole plug of common alternating current.
3, make with use
The assembly of lamp of short time lash-up is shown 2 times according to the graph undertake. Outside dividing fluorescent lamp and XP of power source outlet, the others yuan what all solder installs parts of an apparatus to use thin board to abstain in is airtight small box (bulk makes an appointment with 65mm×65mm×35mm) inside. Fluorescent tube passes lamp holder of calorie of type of buccal low base to use hammer of silk of 3 Mu Luo to secure go up in circuit box face plate; What XP makes an appointment with 1m through growing is double stranded soft model lead is derivative outside circuit box.
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