CN2560186Y - Start-up circuit apparatus for instantaneous igniting fluorescent lamp - Google Patents

Abstract

The utility model discloses a fluorescent lamp starting circuit device which can start the fluorescent lamp instantaneously, consisting of a discharging circuit part which consists of a choke connected in series with a filament of the fluorescent lamp, a starting circuit part connected with the filament and the choke to lead the fluorescent lamp to be turned on during a certain time interval through a power supply and to be turned off after the glow discharge of the fluorescent lamp finished, and a protecting circuit part used for turning off the starting circuit part after the starting circuit part is turned on/off for a plurality of times.

Description

Moment actuated type fluorescent lamp start circuit device

Technical field

The utility model relates to a kind of moment actuated type fluorescent lamp start circuit device, and it adopts a kind of high frequency switch power, lights fluorescent lamp in a flash with a kind of very simple mode, can also adjust the brightness of fluorescent lamp.

Background technology

Compare with incandescent lamp, the luminous efficiency of fluorescent lamp will exceed 3 to 5 times (In/ watts), and the life-span is also much longer.Therefore, fluorescent lamp is used as a kind of very important artificial light sources.But as glow-discharge lamp, fluorescent lamp generally has a kind of cathode resistor structure, and therefore needs higher relatively discharge trigger voltage.Usually for electric current in the limiter tube obtains enough discharge trigger voltages simultaneously, generally all to use glow starter and the ballast that comprises a choke.Its glow starter adopts a bimetal release contact, and electric current is undergone mutation in the time of its open circuit.Therefore, as Fig. 1 and shown in Figure 5, under the help of ballast, electric current in the lamp becomes the B stage (glow discharge tube short circuit current) by the A stage (glow current), and then become the C stage (normal starting current), the two ends of lamp produce very high peak voltage in the B stage, thereby light fluorescent lamp.The not only simple cost but also low of this method, but it has a shortcoming, and that is exactly to light the time that lamp need spend several seconds.

In addition, people know a kind of quick start method, and lantern festival is being lighted in a flash by this method.But, in this method, need a relatively large step-up transformer, so it has some shortcomings, such as: cost height, Heavy Weight, current loss is big and need to use special-purpose fluorescent light fittings (with reference to figure 2).

In order to overcome above-mentioned shortcoming, the someone has proposed to adopt the moment start-up circuit of semiconductor device shown in Figure 3.With reference to figure 3, this device adopts the bucking coil (compensating turns) of choke, utilizes the angle of flow (angle) of diode to give a disk (disc) charging.In addition, high-voltage pulse is offered bucking coil, thereby it is offered fluorescent lamp.In addition, TRIAC SCR (Silicon Controlled Rectifier silicon controlled rectifier), it is an alternating-current bidirectional control device, (at negative half period) is charged to saturated by the non-linear supersaturation capacitor CN with charging saturation characteristic, then, in positive half cycle, produce a high back voltage pulse.With reference to figure 6, wherein D is a supply voltage, and E is a trigger impulse, and F is the lamp starting impulse, and G is a heater current.

Fluorescent lamp is accompanied by the nonlinear impedance discharge with complex load in this situation.Ballast includes the impedance of inductive part, makes flash-over characteristic owing to the power factor that has postponed alters a great deal.Flash-over characteristic comprises outmoded degree of lamp current state, distortion plate change in voltage, ambient temperature and fluorescent lamp or the like.In this glow discharge tube, the characteristic variations complexity may cause incomplete discharge in the working method that exchanges half cycle internal trigger type, and perhaps this circuit can make fluorescent tube scintillation occur.

Meanwhile, widely used recently electric ballast is a kind of strong method of switching (with reference to figure 4) that several KHz are used for commercial power.In this ballast, loss can produce harmful electromagnetic wave along with the increase of driving frequency increases with being directly proportional, and this ballast product is very expensive, and other supplementary costs is also very expensive.In addition,, follow rising, surge voltage and the LC oscillating circuit of the voltage-to-current of mechanical switch to cause switch generation phase deviation, thereby cause circuit to damage with reference to figure 7 (J is an input voltage, and K is an input current, and M is a lamp current).In addition, in start-up course, alternating current phases angle control method remains a problem.

Starting the engineering field, the lamp high-frequency drive is being carried out other research, to improve starting efficiency.

Summary of the invention

The purpose of this utility model is exactly the above-mentioned shortcoming that overcomes in the conventional art.

Therefore a purpose of the present utility model provides a kind of moment actuated type fluorescent lamp start circuit device, and it can start fluorescent lamp in a flash, and has very high reliability.

Another purpose of the present utility model provides a kind of moment actuated type fluorescent lamp start circuit device, and it can start in a flash, and this circuit is very compact, with low cost.

To achieve these goals, the utility model proposes a kind of moment actuated type fluorescent lamp start circuit device, it comprises: a discharge circuit part comprises a choke of connecting with Filament of fluorescent lamp; A start-up circuit part, it is connected with filament and choke, thereby opens in particular time interval by power supply, turn-offs after the glow discharge of fluorescent lamp finishes; And a protective circuit part, after start-up circuit partly repeats certain number of times on/off operation, be used to close the start-up circuit part.

Concrete technical scheme provides a kind of moment actuated type fluorescent lamp start circuit device, and this start-up circuit comprises:

A discharge circuit part: it comprises a rectifier of connecting with fluorescent lamp, and this fluorescent lamp has first and is connected with an AC power with second filament and by this rectifier; This rectifier has first H1 and second input H2, is connected with second filament with first of fluorescent lamp respectively, and this rectifier also has first H3 and second output H4;

A start-up circuit part: it comprises a silicon control device, is connected between first input H1 and second the input H2; With a transistor circuit part, be connected between first output H3 and second the output H4.

Described moment actuated type fluorescent lamp start circuit device, the anode of this silicon control device SCR1 is connected to a node H1, the negative electrode of silicon control device SCR1 then is connected to another node H2, two node H1 are connected with the input of a rectifier bridge with H2, and this rectifier bridge comprises electric bridge diode D1, D2, D3 and D4.

Described moment actuated type fluorescent lamp start circuit device, the positive output end of described electric bridge diode is connected with transistorized collector electrode, also the negative electrode with Zener diode ZD1 is connected, the negative output terminal of electric bridge diode then is connected with the emitter of transistor Q.

Described moment actuated type fluorescent lamp start circuit device, this transistor circuit partly comprises:

A transistor, it has a base stage, a collector electrode and an emitter, and wherein collector electrode is connected with first output H3, and emitter is connected with second output H4.

Described moment actuated type fluorescent lamp start circuit device, this transistor circuit part also comprises:

The primary coil of a transformer, it is connected between transistor base and second the output H4; The secondary coil of a transformer has first end and second end, and first end is connected with second output H4; Diac with first end and second end, its first end is connected with second end of secondary coil; A time capacitor, it is connected between diac second end and second output (H4); A Zener diode and one second resistance, be connected in first and second output (H3, H4) between; And first resistance, first end is connected between Zener diode and second resistance, second end is connected with second end of diac, transistor circuit part wherein produces the switching voltage pulse on the basis of the frequency that the time constant of determining with time capacitor and first resistance provides, the frequency of its switching voltage pulse is between 1kHz-20kHz.

Described moment actuated type fluorescent lamp start circuit device, also comprise:

A protective circuit part, can forbid producing the switching voltage pulse with the transistor circuit part, this protective circuit is connected between two nodes (H3 and H4), Zener diode ZD2 and resistance R 3 and resistance R 7 series connection, and an electrolytic capacitor C2 is then in parallel with Zener diode ZD2 and resistance R 7; The anode of the silicon control device (SCR2) of this protective circuit part is connected with a node (H6), and between two nodes (H7 and H4), resistance R of connecting 4 and electrolytic capacitor C3; At a node (H4) with between a node between resistance R 4 and the electrolytic capacitor C3, resistance R of connecting 5 and resistance R 6.A node between resistance R 5 and the resistance R 6 is connected with the grid of silicon control device (SCR2).

If do not adopt choke, circuit arrangement of the present invention replaces to a kind of glow plug (g1ow plug) in the fluorescent light fittings of glow starter type, thereby can be in a simple manner the fluorescent lamp starting plant modification of glow starter type be become a kind of moment starting drive.

In the course of the work, can adopt a kind of silicon control device, wherein negative pole or anodal conducting electric current pass through the start-up circuit part, thereby the THE FILAMENT DISCHARGE AND exciting current is provided.

In the utility model, do not adopt by electric ballast commercial power is carried out rectification, thereby with the conversion method of the switch drive fluorescent lamp of several KHz, and be to use following method.That is to say, as shown in Figure 9, between the discharge path H1 of fluorescent lamp P and H2, carry out high speed and switch that the short circuit current i1 by ballast is enough to preheating filament.For example, induce the voltage that starts glow discharge in the ballast, then, this voltage is offered the two ends of fluorescent lamp with the short circuit current i1 of the frequency switching of 1kHz-20kHz.In the time of fluorescent lamp lighting, just cancel short circuit current i1, illuminating state is kept by a discharging current i2, and it flows through ballast and fluorescent lamp two ends.Light operation and be that switch with relative upper frequency starts, and therefore, can eliminate all flickers basically.

If startup and discharge operation carry out with a stable manner, even external voltage changes, the voltage on the fluorescent lamp also can be kept constant.So, can adjust input voltage with transformer, thus the brightness of control fluorescent lamp.

Describe most preferred embodiment of the present invention in detail below in conjunction with accompanying drawing, above-mentioned purpose of the present invention and other advantage can be more apparent.

Description of drawings

Fig. 1 is a circuit diagram explanation of the fluorescent lamp start circuit of glow-starting type;

Fig. 2 is the tradition circuit description of actuated type fluorescent lamp start circuit fast;

Fig. 3 is the circuit description of conditional electronic start-up circuit;

Fig. 4 is the circuit description of traditional high-frequency type fluorescent lamp start circuit;

Fig. 5 illustrates the startup waveform of the fluorescent lamp start circuit of conventional fluorescent starter type;

Fig. 6 illustrates the startup waveform of conditional electronic start-up circuit;

Fig. 7 illustrates the waveform of traditional high-frequency type fluorescent lamp start circuit;

Fig. 8 be in the utility model moment actuated type total circuit description of fluorescent lamp start circuit device;

Fig. 9 illustrates the operation principle of fluorescent lamp start circuit device in the utility model;

In Figure 10 A and Figure 10 B explanation the utility model in normal start-up course the voltage and current relation on the glow discharge path;

The contrast relationship of light output and lamp power and start-up circuit electric current in Figure 11 A and Figure 11 B explanation the utility model;

Figure 12 illustrates that start-up circuit device in the utility model lights the waveform in the process; With

Figure 13 illustrates the waveform when brightness is adjusted in the utility model start-up circuit device.

Embodiment

With reference to figure 8, fluorescent lamp start circuit device of the present utility model comprises: 1. discharge circuit part, 2. start-up circuit part and 3. protective circuit parts.

Discharge circuit partly keeps the glow discharge state of fluorescent lamp.For example, 100 volts interchange commercial power offers the two ends of fluorescent lamp F by ballast (choke) CH from brilliance control transformer T.Then, electric energy is by filament RfA and interim respectively node H1 and the H2 of arriving of RfB.

Start-up circuit partly starts the glow discharging process of fluorescent lamp.Node H1 is connected to the anode of a silicon control device SCR1, and node H2 then is connected to the negative electrode of silicon control device SCR1.The grid of silicon control device SCR1 is in open-circuit condition.In addition, node H1 is connected with the input of a rectifier bridge with H2, and this rectifier bridge comprises electric bridge diode D1, D2, D3 and D4.In addition, the positive output end of electric bridge diode is connected with the collector electrode of transistor Q, and also the negative electrode with Zener diode ZD1 is connected, and the negative output terminal of electric bridge diode then is connected with the emitter of transistor Q.The base stage of transistor Q is connected with the primary coil N1 of a toroidal transformer, and when a node between the end of the other end of primary coil N1 and secondary coil N2 (they link together), the anode (node H5) of the emitter by transistor Q and resistance R 2 and Zener diode ZD1 is when being connected.The other end of secondary coil N2 is connected with the end of a diac (diac) DA.And the other end of diac (node H6) is connected with node H5 by resistance R 1, also the emitter (node H4) by capacitor C1 and transistor Q is when being connected, a bias current is provided for the base stage of transistor Q, therefore, realized E level work (an E grade operationis carried out).

When fluorescent lamp breaks down, when removed or supply voltage is too high, protective circuit protection start-up circuit part.Between node H3 and H4, Zener diode ZD2 and resistance R 3 and R7 series connection, an electrolytic capacitor C2 is then in parallel with Zener diode ZD2 and resistance R 7.Like this, between node H7 and node H4, just between R3 and R7, obtain the low-voltage dc voltage of an about 2V.

Node H6 is connected with the anode of silicon control device SCR2, and between node H7 and H4, resistance R of connecting 4 and electrolytic capacitor C3.Between a node H4 and a node (between resistance R 4 and electrolytic capacitor C3), series resistance R5 and R6.A node between resistance R 5 and the R6 is connected with the grid of silicon control device SCR2.

Introduce the course of work of the start-up circuit that above-described the present invention sets up below.Power on if add, brilliance control transformer T provides primary power to node H1 and H2 by ballast CH and filament RfA, RfB, just the potential circuit input.In the starting stage, therefore the open-grid of silicon control device SCR1, is in closed condition.But, if transistor opens and closes with specific interval after a while, because the effect of high induction voltage, puncturing at the positive half cycle of input voltage, thereby allow to conduct, the result is that filament RfA and RfB have obtained electric current.When fluorescent lamp starting glow discharge, and when it was lighted, transistor Q was closed, and silicon control device SCR1 also remains on closed condition.After this, a positive voltage is added in suddenly on the silicon control device SCR1 that is in ground state, and at this moment, a big voltage source is crossed it and made its conducting.Therefore, in order to improve this phenomenon, being connected the anode of silicon control device SCR1 and a node between two resistance between the negative electrode can be connected with the grid of silicon control device SCR1.

Under the situation of 100 volts of supply voltages, the puncture voltage of used Zener diode ZD1 is 140 volts.This circuit comprises transistor Q, Zener diode ZD1, resistance R 1 and R2, primary coil N1 and secondary coil N2, diac DA and capacitor C1, produces pulse signal on the basis of the time constant that capacitor C1 and resistor R 1 determined.Under this condition, only during base current was to draw the phase place of coming from secondary coil N2, transistor Q just was opened.When not having electric current to come to enter base stage from secondary coil N2 absorption, transistor Q is back-biased, thereby is turned off.In this way,, just have the potential barrier that a high-voltage pulse energy flows through the electric current bridge, thereby occur at node H1 and H2 if transistor Q opens and turn-off (for example 1kHz-20kHz) with very high frequency.As a result, ballast CH produces the high frequency voltage of an about 1000-1500 volt, thereby starts the glow discharge of fluorescent lamp, lights fluorescent lamp.In the time of transistor Q conducting, electric current is provided for filament RfA and RfB, thereby promotes the beginning of glow discharge.In addition, as mentioned above, silicon control device SCR1 replenishes heater current, thereby guarantees that glow discharge can begin fast.

When glow discharge at first, the voltage between node H1 and the H2 drops to about 110 volts from about 200 volts.The puncture voltage of Zener diode ZD1 is about 140 volts, therefore, comprises that the oscillating circuit of transistor Q can stop this vibration.If glow discharge is because certain reason stops, the voltage between node H1 and the H2 rises to 200 volts again again, and the result comprises that the oscillating circuit of transistor Q just recovers vibration again.

If because oversize fluorescent lamp decreased performance or the fluorescent lamp of making of time that uses is removed, the voltage between node H1 and the H2 maintains about 200 volts, this oscillating circuit will continue vibration.So the load of transistor Q can be excessive.The protective circuit part can solve this problem., trigger the grid of silicon control device SCR2, thereby make silicon control device SCR2 conducting after second (this time is determined by the time constant that C3 and R4 provide) at power-on time past 5-7.Like this, capacitor C1 short circuit, thereby the vibration of failure of oscillations circuit.If the load of transistor Q that is to say that oscillating circuit can be lockable, so because certain reason fluorescent lamp is not activated, can be dispersed after second having experienced about 5-7.When attempting starting fluorescent lamp, power supply is disconnected, and then, after capacitor C3 had been put electricity, power supply recovered again.

Figure 10 A is the electrical schematic diagram of fluorescent lamp, and wherein vL is a modulating voltage, and iL is a lamp current;

Figure 10 B has represented lamp equivalent resistance r=Δ vL/ Δ iL＜0, and wherein the coordinate transverse axis is lamp current il, and the longitudinal axis is modulating voltage vL;

Figure 11 A has represented the contrast relationship between input power supply P and the light output;

Figure 11 B has represented the contrast relationship between lamp current I and the modulating voltage V;

Figure 12 has represented in the start-up circuit device, from initial time T _oThe waveform of beginning, the coordinate transverse axis is the time;

Waveform when Figure 13 has represented that brightness in the start-up circuit device is adjusted, wherein transverse axis is the time ... be 100% o'clock curve,---for adjusting to 50% o'clock curve, the switching pulse that S partly makes up for modulating voltage.

Figure 10 illustrates operating characteristic of the present utility model to these figure or waveform that Figure 13 shows.

According to top description, the present invention does not need bulky special element, such as the starting drive in the quick start method, and only needs little, the cheap element of volume in the circuit of moment startup fluorescent lamp.After starting, starting state can not cause any power consumption, then can keep this power consumption in traditional glow starter startup method.In addition, the present invention can be applied to existing glow-starting fluorescent lamp at an easy rate.

Claims (9)

1. One kind moment actuated type fluorescent lamp start circuit device, it is characterized in that this start-up circuit device comprises:

   A discharge circuit part: it comprises a rectifier of connecting with fluorescent lamp, and this fluorescent lamp has first and is connected with an AC power with second filament and by this rectifier; This rectifier have first and second input (H1 H2), is connected with second filament with first of fluorescent lamp respectively, this rectifier also have first with second output (H3, H4);

   A start-up circuit part: it comprises a silicon control device, be connected first and second input (H1, H2) between; With a transistor circuit part, be connected first and second output (H3, H4) between.
2. 2. moment as claimed in claim 1 actuated type fluorescent lamp start circuit device, it is characterized in that: the anode of described silicon control device (SCR1) is connected to a node (H1), the negative electrode of silicon control device (SCR1) then is connected to another node (H2), two nodes (H1 and H2) are connected with the input of a rectifier bridge, and this rectifier bridge comprises electric bridge diode D1, D2, D3 and D4.
3. 3. moment as claimed in claim 2 actuated type fluorescent lamp start circuit device, it is characterized in that: the positive output end of described electric bridge diode is connected with transistorized collector electrode, also the negative electrode with Zener diode (ZD1) is connected, and the negative output terminal of electric bridge diode then is connected with the emitter of transistor (Q).
4. 4. moment as claimed in claim 1 actuated type fluorescent lamp start circuit device, it is characterized in that this transistor circuit partly comprises:

   A transistor, it has a base stage, a collector electrode and an emitter, and wherein collector electrode is connected with first output (H3), and emitter is connected with second output (H4).
5. 5. moment as claimed in claim 4 actuated type fluorescent lamp start circuit device, it is characterized in that this transistor circuit part also comprises:

   The primary coil of a transformer, it is connected between transistor base and second output (H4);

   The secondary coil of a transformer has first end and second end, and first end is connected with second output (H4);

   Diac with first end and second end, its first end is connected with second end of secondary coil;

   A time capacitor, it is connected between diac second end and second output (H4);

   A Zener diode and one second resistance, be connected in first and second output (H3, H4) between; And

   One first resistance, first end is connected between Zener diode and second resistance, second end is connected with second end of diac, and transistor circuit part wherein produces the switching voltage pulse on the basis of the frequency that the time constant of determining with time capacitor and first resistance provides.
6. 6. moment as claimed in claim 5 actuated type fluorescent lamp start circuit device, it is characterized in that: the frequency of its switching voltage pulse is between 1kHz-20kHz.
7. 7. moment as claimed in claim 1 actuated type fluorescent lamp start circuit device, it is characterized in that, also comprise:

   A protective circuit part; can forbid producing the switching voltage pulse with the transistor circuit part; this protective circuit is connected between two nodes (H3 and H4), Zener diode ZD2 and resistance R 3 and resistance R 7 series connection, and an electrolytic capacitor C2 is then in parallel with Zener diode ZD2 and resistance R 7.
8. 8. moment as claimed in claim 7 actuated type fluorescent lamp start circuit device, it is characterized in that: the anode of the silicon control device (SCR2) of this protective circuit part is connected with a node (H6), and between two nodes (H7 and H4), resistance R of connecting 4 and electrolytic capacitor C3; At a node (H4) with between a node between resistance R 4 and the electrolytic capacitor C3, resistance R of connecting 5 and resistance R 6.A node between resistance R 5 and the resistance R 6 is connected with the grid of silicon control device (SCR2).
9. 9. moment as claimed in claim 1 actuated type fluorescent lamp start circuit device, it is characterized in that its discharge circuit part also comprises:

   A brilliance control transformer, it is in parallel with AC power between ballast and second filament.

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