CN2162074Y - Commutating gas discharge lamp with protector - Google Patents

Abstract

The utility model comprises a bridge rectification filter circuit, a switching circuit, a high frequency oscillating circuit, a gas discharge lamp tube, a transformer B1, a coil L4, an isolation direct circuit and bimetal protectors K1, K2. The utility model is characterized in that when the discharge lamp tube can not ignite because of broken filament and gas leakage, the bimetal protectors K1, K2 can cut off the triodes BG1, BG2 in the switching circuit in time to protect the circuit, and the service life of the lamp is extended.

Description

Commutating gas discharge lamp with protector

The utility model belongs to the gaseous discharge lamp technical field.

At present the electronics that more generally uses is filled out the gaseous discharge lamp of stream device control, and for example the CN2057301U(application number 89213227.2) a kind of lamp of bulletin, its advantage is not have starter, long service life in the circuit.But do not have protective device in the circuit, when filament blow and lamp tube air leaking, triode can burn out because of long-term overload.

The purpose of this utility model is to provide a kind of rectification type gaseous discharge lamp that the triode protector is arranged.

The utility model comprises current rectifying and wave filtering circuit 1, switching circuit 2, high-frequency oscillating circuits 3, gas discharge lamp tube 4, transformer B ₁, coil L ₄, block isolating circuit 5, bimetal leaf protector K ₁, K ₂Fig. 1 is its basic circuit diagram.Current rectifying and wave filtering circuit 1 comprises by 4 diode D _1-4The bridge rectifier that is connected into, and filter capacitor C ₁And R ₁, export about 300 volts of direct voltages.Switching circuit 2 comprises two triode BG ₁And BG ₂, BG ₁With BG ₂Series connection is at both ends of power, BG ₂Collector and emitter be connected with high-frequency oscillating circuits 3, constitute the discharge loop of high-frequency oscillating circuits, in its base circuit R is arranged ₄, L ₂, C ₄High-frequency bypass capacitor for triode.Block isolating circuit 5 comprises C ₂With R ₂, its positive termination positive source, negative terminal meets C ₃Positive pole, and pass through D ₅Receive BG ₁Collector electrode, pass through D ₆Receive BG ₁Base stage.Capacitor C ₃Be connected in parallel on BG ₁Collector electrode and emitter between, BG ₁Base circuit in be connected to R ₃And L ₁, high-frequency oscillating circuits 3 comprises capacitor C ₅, C ₆And coil L ₄, C ₆, C ₅, L ₄With L ₃And two filament series connection of gas discharge lamp tube 4, a termination BG ₂Collector electrode, a termination BG ₂Emitter.Transformer B ₁Comprise three groups of coil L ₁, L ₂, L ₃, primary coil L ₃One end and L ₄Join the other end and BG ₂Emitter joins, secondary coil L ₁Be connected on BG ₁Base circuit in, L ₂Be connected on BG ₂Base circuit in.Bimetal leaf protector K ₁Be contained in BG ₁Radiator on experience its temperature, its normally open contact and L ₃In parallel; K ₂Be contained in the shell of sealing, interior is vacuum, and its normally open contact one terminates at L ₄In the tap in the middle of the coil, another termination L ₃End, with L ₃And L ₄A part of in parallel.

After connecting circuit, the direct voltage of current rectifying and wave filtering circuit 1 output is through C ₂R ₂Give C ₃C is worked as in charging ₃Voltage rises and reaches D ₆Puncture voltage the time, D ₆Conducting, C ₃Promptly pass through D ₆, R ₃, L ₁Discharge makes BG ₁After the conducting, supply voltage promptly is added in C ₅, C ₆, L ₄, L ₃On circuit that filament is connected, give C ₅, C ₆C is worked as in charging ₅, C ₆Voltage rises to a certain degree, when electric current reduces, because L ₃Induction effect, L ₂The induced potential that produces makes BG ₂Conducting gradually, C ₅, C ₆Just pass through BG ₂Discharge, high-frequency oscillating circuits 3 produces series resonance, C ₆The voltage at two ends punctures gas discharge tube and produces gas discharge, and lamp is promptly lighted.L ₄Play the ballast effect.

In higher-order of oscillation production process, bimetal leaf protector K ₂The normally open contact two ends produce gas discharge because of being added with certain voltage, bimetal leaf is heated and crooked gradually, but because of the very fast puncture of fluorescent tube, the contact does not reach the degree of connection as yet; And when discharge lamp can not puncture because of filament blow and gas leakage, K ₂The contact will be when long the energising bi-metal plate deformed closed, with L ₃Short circuit ends triode.In the course of the work, if BG ₁Overheated, can make K ₁Bi-metal plate deformed normally open contact closure, and with L ₃Short circuit ends triode, thereby plays a protective role.Block isolating circuit 5, only instantaneous at the connection circuit, supply voltage passes through it to C ₃BG is given in charging ₁Inject base flow, make lamp open combustion, and work as L ₃By K ₁, K ₂Short circuit L ₁In non-inductive electromotive force when producing, BG ₁Base circuit then can not be from C ₃Obtain enough base flows, guarantee BG ₁Be in cut-off state.

The utility model has the advantages that, only need add the element of minority, can make the discharge lamp circuit have defencive function, triode is not damaged, prolong the useful life of lamp.

The utility model is implemented to try out by the applicant.In an embodiment, BG ₁, BG ₂Be BU406 type NPN triode, C ₁Be 0.02uF, C ₂Be the withstand voltage 400V of 10uF(), C ₃Be 0.1uF, C ₅Be 0.1uF, C ₆Be 5600PF, D ₅Be 4001 types, D ₆Use the 0.5W bidirectional diode, L ₁And L ₂Be 2 circles, L ₃Be 8 circles, L ₄Be 500 circles, fluorescent tube is the 40W fluorescent tube, K ₁Be the neon tube in the starter for fluorescent, K ₁Be bimetal release.Use 220 volts of interchanges, circuital current 170mA.

Claims (1)

1, a kind of rectification type gaseous discharge lamp comprises current rectifying and wave filtering circuit 1, switching circuit 2, high-frequency oscillating circuits 3, gas discharge lamp tube 4, transformer B ₁, coil L ₄, it is characterized in that having bimetal leaf protector K ₁, K ₂With block isolating circuit 5; Bimetal leaf protector K ₁Be contained in BG in the switching circuit 2 ₁Radiator on, experience its temperature, normally open contact and transformer B ₁In L ₃In parallel; Bimetal leaf protector K ₂Be contained in the shell of sealing, interior is vacuum, and its normally open contact is connected on L ₄In the tap in the middle of the coil, another termination transformer B ₁Middle L ₃Not end, with L ₃And L ₄A part of in parallel; Block isolating circuit 5 comprises the C of series connection ₂, R ₂, its positive termination positive source, negative terminal is received C ₃Anodal and pass through D ₅Receive BG ₁Collector electrode, pass through D ₆Meet BG ₂Base stage.

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