CN2343740Y

CN2343740Y - Fast starter for fluorescent lamp

Info

Publication number: CN2343740Y
Application number: CN 98240875
Authority: CN
Inventors: 江吉昌
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-09-25
Filing date: 1998-09-25
Publication date: 1999-10-13
Anticipated expiration: 2008-09-25

Abstract

The utility model relates to a fast starter for fluorescent lamps, comprising a switching element, a heating circuit, a trigger circuit, and a switch cutoff unit, wherein, the switching element is a thyristor whose anode is connected with one end of a lamp, and the end of the lamp is connected with a stabilizer and one end of a power supply in sequence; the cathode of the thyristor is connected with the switch cutoff unit, and is connected with other ends of the lamp and the power supply, and the control pole of the thyristor is connected with the trigger circuit; the trigger circuit is composed of a resistor and a zener diode, the control pole of the thyristor is connected with one end of the power supply passing through the zener diode and the resistor, and is connected with the cathode of the trigger circuit passing through the other resistor, and the thyristor can be triggered at a certain angle; the switch cutoff unit is a capacitor.

Description

The fluorescent lamp quick starter

The utility model relates to a kind of fluorescent lamp starter, refers to a kind of fluorescent lamp quick starter of fluorescent lamp capable of fast starting especially.

Known to common people, starter is the indispensable starting component of fluorescent lamp, starter in one's early years is convergence mechanical type structure, as shown in Figure 3, its mainly utilize pairing sheet metal 70 electric current by the time improve temperature and distortion is closed, and when temperature descends the recovery open circuit, make the choking-winding 71 on the fluorescent lamp generate back electromotive force and light fluorescent tube 72.This kind utilizes the starter of alloy material characteristic having following shortcoming:

1, will occur one section lag time before fluorescent lamp is lighted, bring inconvenience.

2, pairing sheet metal 70 is the mechanical type structure, and fault is many and useful life is shorter.

For above-mentioned reasons, so the appearance of " electronic starter " is arranged, shown in Fig. 4,5, it is respectively by metal oxide semiconductcor field effect transistor 81 or high voltage transistor 82 switch element as fluorescent tube 72, and by deadline of a control circuit 80 control metal oxide semiconductcor field effect transistors 81 or transistor 82, though but existing electronic starter declares and can start moment that still there is following shortcoming in it:

1, is difficult for accurately control, is subject to the influence of factors such as temperature, voltage, part error, can't light smoothly;

Superheated during 2, owing to startup, and quicken the lamp tube ends melanism, and useful life is short;

3, because of using metal oxide semiconductcor field effect transistor (MOSFET) or high voltage transistor as switch element, the use cost height is not inconsistent economic benefit.And often when ending, can't bear the back electromotive force impacting with high pressure that stabilizer generates, and suffer punch through damage.

Be illustrated in figure 6 as another kind of electronic type starter, it mainly is that SCR (controllable silicon) is as switch element, power supply opening when fluorescent lamp, and the A of power supply end is during for positive half cycle, electric current triggers SCR by resistance R 4 through capacitor C 2, electric current promptly arrives the B end by the A end of power supply through SCR, diode D1～D4, and makes fluorescent tube L begin heating.

When the B of power supply end was for positive half cycle by the time, electric current was through 1 charging of 1 pair of capacitor C of resistance R, through charging to when saturated when capacitor C 1 after several weeks, transistor T R1 conducting, and make transistor T R2 conducting simultaneously, this moment, SCR was cut off, and make stabilizer 2 produce a back electromotive force, light fluorescent tube L with high pressure.

The aforementioned electronic starter is to utilize SCR as switch element, but after controllable silicon (SCR) triggers with less trigger delay angle in the 60Hz sine wave signal, just can't end with interior at 180 degree, and only near 180 degree and 360 degree, when its voltage was reduced near 0 volt, SCR just can end less than keeping electric current naturally because of the positive and negative electrode current.Because electric current is minimum, can't produce the high pressure back electromotive force, can't be in order to light the fluorescent tube more than the 10W, so applicability is lower.

Main purpose of the present utility model is to provide a kind of fluorescent lamp starter of various fluorescent lamps capable of fast starting.

When electric power starting, circuits for triggering wherein will make controllable silicon in the special angle triggering and conducting, and be begun to the fluorescent tube heating, after heating is finished by heater circuit, switch will make controllable silicon end rapidly by the unit, light fluorescent tube and generate back electromotive force with high pressure.

Of the present utility model time a purpose is to provide a kind of fluorescent tube to be difficult for the fluorescent lamp starter of blackening.

Wherein heater circuit is to be connected with switch element with second controllable silicon, and the second SCR control utmost point is connected with a switch element and a transistorized collector electrode respectively, and transistorized base stage is provided with charging circuit again;

When electric power starting, the switch element conducting, the also conducting of second controllable silicon makes fluorescent tube begin heating, at the same time, charging circuit also begins charging, and until saturated, transistor is with conducting, second controllable silicon ends and stops heating, promptly lacks heating time, and fluorescent tube is difficult for blackening.For achieving the above object, the utility model is taked following measure:

Fluorescent lamp quick starter of the present utility model, mainly be with first controllable silicon as switch element, and and a heater circuit, circuits for triggering and a switch form by unit etc.; Circuits for triggering are made up of a plurality of resistance and Zener diode, and the conducting of control switch element and its trigger angle.

Switch is the negative electrode that is connected in switch element with a charging capacitor by the unit, when the heater circuit heating is finished, switch element still is triggered at the special angle of inferior one positive half cycle, and begin charging capacitor is charged, because the trigger angle of circuits for triggering is set in about 80 degree, and sinusoidal wave when spending near 90 voltage near crest voltage, booster tension significantly, therefore cause the charging current of charging capacitor to descend rapidly, because electric current is less than the electric current of keeping of switch element, thus switch element end, and because of the switch element cut-off speed fast, so will make the back electromotive force of stabilizer generation high pressure, to light fluorescent tube rapidly.

The utility model is taked following concrete structure:

Fluorescent lamp quick starter of the present utility model comprises that switch element, a heater circuit, circuits for triggering and a switch are by the unit; Switch element is a controllable silicon, and an end of silicon controlled anode and fluorescent tube is connected, and this end of fluorescent tube is connected with an end of stabilizer and power supply in regular turn again; It is characterized in that:

Connect switch on the described silicon controlled negative electrode by the unit, and be connected by the other end of heater circuit with fluorescent tube and power supply, its control utmost point connects circuits for triggering;

Circuits for triggering are made up of resistance and Zener diode, and the silicon controlled control utmost point is connected with power supply one end by Zener diode, a resistance, is connected with its negative electrode through another resistance again, and controllable silicon is triggered at special angle;

Switch is a charging capacitor by the unit.

Described fluorescent lamp quick starter is characterized in that: described heater circuit includes one second controllable silicon, transistor and electric capacity; The second silicon controlled anode is connected with described first controllable silicon, its control utmost point is connected with first controllable silicon and transistorized collector electrode respectively, its negative electrode removes and is connected with transistorized emitter, be connected to the other end of power supply in addition by a diode, be provided with an electric capacity between transistorized base stage, emitter.

Further specify architectural feature of the present utility model below in conjunction with accompanying drawing.

Brief Description Of Drawings:

Fig. 1 is a circuit diagram of the present utility model.

Fig. 2 is a working waveform figure of the present utility model.

Fig. 3 utilizes the schematic diagram of pairing sheet metal as the fluorescent lamp starter of switch element.

Fig. 4 utilizes the schematic diagram of metal oxide semiconductcor field effect transistor as the fluorescent lamp starter of switch element.

Fig. 5 utilizes the schematic diagram of high voltage transistor as the fluorescent lamp starter of switch element.

Fig. 6 commonly uses the circuit diagram of electronic type starter.

As shown in Figure 1, it is a circuit diagram of the present utility model, the utility model mainly be with a controllable silicon 4 as switch element, and cooperate a heater circuit 10, circuits for triggering 20 and a switch to form by unit 30; Wherein:

Controllable silicon 4 is to be connected with the A of anode and fluorescent tube 1 one ends, stabilizer 2 and power supply end, and its negative electrode is provided with switch by unit 30, and the B end by heater circuit 10 and fluorescent tube 1 other end and power supply is connected simultaneously, and it controls utmost point connection circuits for triggering 20;

Heater circuit 10 includes second controllable silicon SCR 2, transistor T 1, resistance R 5～R7, capacitor C 2 and diode D3, wherein second controllable silicon SCR 2 is to be connected with controllable silicon SCR 1 with anode, its control utmost point except that through a resistance R 5 with controllable silicon SCR 1 negative electrode is connected, be connected with the collection utmost point of transistor T 1 again, its negative electrode is to be connected with transistor T 1 emitter-base bandgap grading, be connected to the B end of power supply in addition by diode D3, be provided with capacitor C 2 between the base stage of transistor T 1, emitter-base bandgap grading;

Circuits for triggering 20 are made up of a plurality of resistance R 1～R4, Zener diode Z and diode D2; The control utmost point of controllable silicon 4 is that the A end by Zener diode, resistance R 1 and power supply is connected, is connected with negative electrode through resistance R 4 again, and circuits for triggering 20 will make controllable silicon 4 conducting when just half cycle about 80 is spent.

Switch is the negative electrodes that are connected in controllable silicon 4 with a charging capacitor C1 by unit 30.

By above-mentioned explanation as can be seen the working method of physical circuit of the present utility model details are as follows:

When the switch SW of power end is connected, electric current removes through circuits for triggering 20 and makes controllable silicon 4 be triggered at the about 80 degree places of sine wave (working waveform figure that sees also Fig. 2), pass through the resistance R 5 of heater circuit 10 again, R6, and will trigger second controllable silicon 5 (SCR2) conducting by the electric current of resistance R 5, this moment, electric current was via second controllable silicon 5, diode D3 constitutes path and makes fluorescent tube 1 begin heating, at the same time, capacitor C 2 on the heater circuit 10 also begins charging, through after several weeks, capacitor C 2 voltages rise and make transistor T 1 conducting, cause the trigger current of second controllable silicon 5 to be shorted to negative electrode and end, promptly finish heating work this moment.

After finishing heating, controllable silicon 4 still is triggered when inferior one positive half cycle about 80 is spent, because second controllable silicon 5 of heater circuit 10 can't trigger because of transistor T 1 conducting, the electric current of controllable silicon 4 will be to capacitor C 1 charging of switch by unit 30 so flow through, but because of the trigger angle that circuits for triggering 20 are set is spent about 80, and it is sinusoidal wave when spending near 90, its voltage is near crest voltage, can't significantly promote, so will cause the charging current of electric capacity to descend rapidly, because electric current is less than the electric current of keeping of controllable silicon 4, so controllable silicon 4 will end, and because of the cut-off speed of controllable silicon 4 fast (controllable silicon 4 is by being triggered to by being to finish in the minimum angle of 80～90 degree, so the time is very short), as known to, the amplitude that stabilizer 2 produces back electromotive force depends on the speed that controllable silicon 4 closes (V=-L * di/dt), the closing velocity of controllable silicon 4 is accelerated now, thus will make stabilizer 2 generate the high pressure back electromotive force, to light fluorescent tube 1 rapidly.

Fail once to light as fluorescent tube 1, then when the power-half cycle, switch will discharge via diode D1 by the capacitor C 1 of unit 30, and when following one-period, heavily cover aforesaid moment by moving to generate back-emf voltage to light fluorescent tube 1.

After fluorescent lamp pipe 1 was lighted, its inner electronics continued to flow, because the metering function of choking-winding in the stabilizer 2, A, the B terminal voltage of the power supply of starter side are reduced, and be lower than the required trigger voltage of controllable silicon 4, so controllable silicon 4 no longer triggers, and starter also quits work.

The utility model compared with prior art has following effect:

From the above, the utility model can utilize aforesaid circuit design to make fluorescent tube quick Start, and owing to utilize controllable silicon SCR to be switch element, can high voltage withstanding, high electric current, And can significantly reduce cost long service life.

Claims

1 one kinds of fluorescent lamp quick starters comprise that switch element, a heater circuit, circuits for triggering and a switch are by the unit; Switch element is a controllable silicon, and an end of silicon controlled anode and fluorescent tube is connected, and this end of fluorescent tube is connected with an end of stabilizer and power supply in regular turn again; It is characterized in that:

Switch is a charging capacitor by the unit.

2 fluorescent lamp quick starters according to claim 1 is characterized in that: described heater circuit includes one second controllable silicon, transistor and electric capacity; The second silicon controlled anode is connected with described first controllable silicon, its control utmost point is connected with first controllable silicon and transistorized collector electrode respectively, its negative electrode removes and is connected with transistorized emitter, be connected to the other end of power supply in addition by a diode, be provided with an electric capacity between transistorized base stage, emitter.