CN2311913Y - Electronic starter for fluorescent lamp - Google Patents

Abstract

The utility model relates to an electronic starter for fluorescent lamps, and the external dimension of the utility model is the same as the external dimension of usual neon bulb type starters. The circuit of the utility model comprises a lamp preheat circuit, a lamp glow starting circuit, and a voltage comparison circuit, which is composed of thyristors, diodes, triodes, capacitors, and resistors. The operating state of the preheat circuit of the lamp preheat circuit is controlled by the voltage comparison circuit according to voltages of the both ends of the lamp before and after the lamp is started. The circuit of the utility model preheats the lamp at the AC half-cycle, the lamp is started by a high voltage which is generated when the circuit approaches to the negative half-cycle peak. The utility model has the advantages of reliable work, and long service life, the fluorescent lamps can be started quickly under low temperature and low voltage, and the service life of the fluorescent lamps can be extended.

Description

Electronic fluorescent lamp starter

The utility model relates to a kind of fluorescent lamp starter.

The inductance type fluorescent lamp ballast is low and long service life with price, and is widely used.But the neon bulb formula starter that is mated work has: useful life is short, start-up time is long, and is difficult to start under low-temp low-pressure, and influences the shortcomings such as useful life of fluorescent lamp.In order to address this problem, some kinds of electronic starters have appearred at present.As " electronics newspaper " December the 7th edition on March 24th, 1996 " talking fluorescent lamp low pressure again starts fast ", Chinese patent 95237262.2 " fluorescent lamp quick starter ", Chinese patent 95225259.7 " electronic starter ", but cost height, volume that these starters have are big, also existing on performance of having is significantly not enough, thereby is not generally promoted the use of as yet.

The purpose of this utility model is that a kind of reliable operation, long service life, cost is low, volume is little electronic fluorescent lamp starter will be provided.It can make fluorescent lamp starter promptly under low-temp low-pressure, and useful life that can the extended day light modulation.

The utility model electronic fluorescent lamp starter, its overall dimension is identical with common neon bulb formula starter.Its circuit by: diode VD2, controllable silicon VS1 are serially connected between two exits, become this circuit fluorescent tube preheat circuit.In technical solution of the present utility model: capacitor C 2, controllable silicon VS2 are serially connected between two exits, and also are serially connected in resistance R 7, R8 between two exits, constitute the tube starting circuit of this circuit jointly.Resistance R 6, diode VD1 and capacitor C 1 also are serially connected between two exits, and the direct voltage on the capacitor C 1 is as the comparative voltage of this circuit.Triode VT1, VT2 and corresponding resistance constitute the voltage comparator circuit of this circuit jointly.This circuit utilizes fluorescent tube before and after starter, the variation of lamp tube ends voltage, and the voltage on the capacitor C 1 is also changed.As control signal, control the operating state of fluorescent tube preheat circuit with the height of the voltage on the capacitor C 1 by voltage comparator circuit.In fluorescent tube preheat circuit conduction period, exchange positive half cycle current and flow through the filament of lamp tube ends and ballast L the fluorescent tube preheating.When negative half period of following and high value, the tube starting circuit turn-on, negative half-cycle current also flows through filament and ballast L through capacitor C 2.Near the negative half period peak value time, the capacitor C 2 saturated current interruptions that flow through filament and ballast L that make.In this moment, ballast L has produced quite high self induction electromotive force, and acts on lamp tube ends behind the supply voltage superposition.Fluorescent tube is after abundant preheating, and the high voltage of lamp tube ends can be lighted fluorescent tube.

Because this circuit has adopted the tube starting circuit.Ballast L strengthens at the immediate current that exchanges negative half period like this, and again near the negative half period peak value time, interrupts the electric current among the ballast L, thereby the self induction electromotive force that ballast L is produced is near peak, and the supply voltage of connecting with it is also near peak value.Thereby make fluorescent lamp be more prone to starter.Simultaneously because this circuit has adopted voltage comparator circuit.After the moment and tube starting of fluorescent tube arc discharge, the fluorescent tube preheat circuit is stabilized in off state like this.Thereby improved the reliability of this circuit working.Because this circuit start rapidly, reliably.From and prolonged useful life of fluorescent lamp.

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

Accompanying drawing is the electrical schematic diagram that the utility model electronic fluorescent lamp starter connects with fluorescent lamp, wherein is the utility model electronic fluorescent lamp starter line map in the frame of broken lines.

Described electronic fluorescent lamp starter circuit includes two exit F, E in the accompanying drawing frame of broken lines, links to each other with the filament of lamp tube ends respectively.

This circuit also includes one, and diode VD2 anode is connected on the exit F by diode VD2, controllable silicon VS1 series connection, and controllable silicon VS1 negative electrode is connected on another exit E, composition be used for fluorescent tube preheat circuit to the fluorescent tube preheating.

This circuit has one by capacitor C 2, controllable silicon VS2 series connection, resistance R 7, R8 also connect, one end of capacitor C 2 negative poles and resistance R 7 is attempted by on the exit F, one end of controllable silicon VS2 anode and resistance R 8 is attempted by on another exit E, resistance R 7 extremely links to each other with controllable silicon VS2 control with contact with R8, controllable silicon VS2 negative electrode links to each other with controllable silicon VS1 anode, has constituted to produce high-tension tube starting circuit in lamp tube ends.

This circuit also has one to be made up of resistance R 6, diode VD1 and capacitor C 1, is serially connected between two exits, is used for providing to circuit step-down, the rectification circuit of comparative voltage.One end of resistance R 6 is connected on the exit F, the other end of resistance R 6 links to each other with diode VD1 anode, diode VD1 negative electrode and 1 anodal linking to each other of capacitor C, capacitor C 1 negative pole is connected on another exit E, and the direct voltage on the capacitor C 1 is as the comparative voltage of this circuit.

This circuit also has a usefulness to adopt the voltage comparator circuit of control fluorescent tube preheat circuit operating state.Be by resistance R 1, the R3 series connection, one end of resistance R 1 is connected on capacitor C 1 positive pole, one end of resistance R 3 is connected on capacitor C 1 negative pole, the contact of resistance R 1 and R3 links to each other with triode VT1 base stage, resistance R 2 is connected across between triode VT1 base stage and the triode VT2 collector electrode, resistance R 4 is connected across between capacitor C 1 positive pole and the triode VT1 collector electrode, resistance R 5 is connected across between capacitor C 1 positive pole and the triode VT2 collector electrode, triode VT1 collector electrode links to each other with triode VT2 base stage, triode VT2 collector electrode extremely links to each other with controllable silicon VS1 control, triode VT1, the VT2 emitter is attempted by on another exit E, has constituted the voltage comparator circuit of this circuit.

This circuit is work like this: rigidly connect when leading to civil power, the voltage of lamp tube ends approaches line voltage.AC power is through resistance R 6 step-downs, and diode VD1 rectification is exchanging positive half cycle to capacitor C 1 charging.Because the voltage on the capacitor C 1 can not become the dividing potential drop effect with resistance R 2, R3, ends triode VT2 conducting state and make voltage comparator circuit at first be in triode VT1.At this moment, controllable silicon VS1 ends.Capacitor C 1 continues charging, comparative voltage on the capacitor C 1 is through resistance R 1, R2 and R3 dividing potential drop, import by triode VT1 base stage, along with the comparative voltage on the capacitor C 1 raises, and make triode VT1 base potential be higher than its conducting voltage, the voltage comparator circuit upset is triode VT1 conducting, triode VT2 cut-off state.The controllable silicon VS1 conducting that is triggered.Because the pressure drop between the controllable silicon VS1 control utmost point and negative electrode is greater than the saturation voltage drop of triode VT2, its pressure drop difference feeds back to triode VT1 base stage through resistance R 2, and triode VT1 base potential is raise.Just realized positive feedback, thereby the upset of voltage comparator circuit state is promptly carried out.At this moment, the conducting of fluorescent tube preheat circuit, the forward voltage drop of lamp tube ends is lower than 2V, and capacitor C 1 charging is interrupted.Comparative voltage on the capacitor C 1 begins to descend, owing to realized that positive feedback, voltage comparator circuit are stabilized in triode VT1 conducting, triode VT2 cut-off state.Its delay time can change by the resistance that changes positive feedback resistor R2.

In fluorescent tube preheat circuit conduction period,, exchange positive half cycle current and flow through the filament of lamp tube ends and ballast L the fluorescent tube preheating because controllable silicon VS1 plays rectified action.The electric charge of capacitor C 2 storages simultaneously also discharges through controllable silicon VS1.(in process to capacitor C 1 charging, controllable silicon VS2 conducting once, capacitor C 2 has been charged saturated.) because the dividing potential drop of resistance R 7, R8 makes controllable silicon VS2 when negative half period of following and high value, conducting is triggered.Negative half-cycle current also flows through filament and ballast L through capacitor C 2, at this moment plays the effect of preheating fluorescent tube earlier.Near the negative half period peak value time, the capacitor C 2 saturated current interruptions that flow through filament and ballast L that make.The immediate current of ballast L in exchanging negative half period strengthens like this, and again near crest voltage the time, interruptive current.Thereby make ballast L produce quite high (near peak) self induction electromotive force and supply voltage (near crest voltage) superposition, form high voltage in lamp tube ends.In fluorescent tube preheat circuit conduction period, this process makes the abundant preheating of fluorescent tube repeatedly, and produces high voltage in lamp tube ends.

Along with the comparative voltage on the capacitor C 1 continues to descend, and make triode VT1 base potential be lower than its conducting voltage, voltage comparator circuit upset promptly again ends triode VT2 conducting state for triode VT1.Controllable silicon VS1 turn-offs.At this moment, the high voltage that is added in lamp tube ends can be lighted fluorescent tube.In the moment of fluorescent tube arc discharge,, and make voltage comparator circuit be stabilized in triode VT2 conducting state owing to the voltage on the capacitor C 1 can not suddenly change again.Behind the daylight lamp glow starting, the voltage of lamp tube ends descends, and deficiency is so that the state turnover of voltage comparator circuit, and voltage comparator circuit is stabilized in triode VT2 conducting state, and controllable silicon VS1 is turn-offed, the fluorescent lamp operate as normal.

At this moment, if fluorescent lamp is starter not, and (this situation generally produces when low-temp low-pressure) electric current to capacitor C 1 charging, repeats said process until daylight lamp glow starting again.

In an embodiment of this circuit, controllable silicon VS1, VS2 select the one-way SCR of 600V1A for use, diode VD1, VD2 selects the silicon rectifier diode of 1000V1A for use, triode VT1, VT2 select NPN small-power silicone tube such as CS9014 for use, capacitor C 1, C2 are respectively the electrolytic capacitor of 160V1uF, 400V0.47uF, and resistance R 1, R2, R3, R4, R5, R6, R7 and R8 are respectively 22M Ω, 300K Ω, 100K Ω, 4.7M Ω, 1M Ω, 47K Ω, 15K Ω and 2.2M Ω.Through test in this case, this starter can make the fluorescent lamp of 6-40W when line voltage is 160V, starter promptly, and under normal voltage, start-up time is below 0.5 second.This starter belongs to noncontacting switch, has very long useful life.

Claims (1)

1, a kind of electronic fluorescent lamp starter, wherein diode VD2, controllable silicon VS1 series connection, diode VD2 anode is connected on the exit F, and controllable silicon VS1 negative electrode is connected on another exit E, becomes the fluorescent tube preheat circuit of this circuit; It is characterized in that: capacitor C 2, controllable silicon VS2 series connection, capacitor C 2 negative poles are connected on the exit F, controllable silicon VS2 anode is connected on another exit E, resistance R 7, R8 also connect, one end of resistance R 7 is connected on the exit F, and an end of resistance R 8 is connected on another exit E, and the contact of resistance R 7 and R8 extremely links to each other with controllable silicon VS2 control, controllable silicon VS2 negative electrode links to each other with controllable silicon VS1 anode, the tube starting circuit of formation; Resistance R 6, diode VD1 connect with capacitor C 1, one end of resistance R 6 is connected on the exit F, the other end of resistance R 6 links to each other with diode VD1 anode, diode VD1 negative electrode and 1 anodal linking to each other of capacitor C, capacitor C 1 negative pole is connected on another exit E, and the direct voltage on the capacitor C 1 is as the comparative voltage of this circuit; Resistance R 1, the R3 series connection, one end of resistance R 1 is connected on capacitor C 1 positive pole, one end of resistance R 3 is connected on capacitor C 1 negative pole, the contact of resistance R 1 and R3 links to each other with triode VT1 base stage, resistance R 2 is connected across between triode VT1 base stage and the triode VT2 collector electrode, resistance R 4 is connected across between capacitor C 1 positive pole and the triode VT1 collector electrode, resistance R 5 is connected across between capacitor C 1 positive pole and the triode VT2 collector electrode, triode VT1 collector electrode links to each other with triode VT2 base stage, triode VT2 collector electrode extremely links to each other with controllable silicon VS1 control, triode VT1, the VT2 emitter is attempted by on another exit E, the voltage comparator circuit of formation.

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