CN1028587C - Apparatus for controlling gas-filled tube lamps - Google Patents

Abstract

In the luminous efficiency of gas-discharge lamps, in particular compact fluorescent lamps, a temperature-compensating element (3) which controls the lamp current in function of temperature is incorporated in the ignition device. This type of temperature-compensating element (3) advantageously consists of a current-limiting reactor in the form of a coil (9) with a central core (10). The core (10) is acted on by a spring (11) and a bimetallic spring (12) in such a way that its depth of penetration into the coil (9) is a function of temperature. The resultant variation in the induction of the current-limiting reactor (L) causes the lamp current to vary in function of temperature in such a way that the gas-discharge lamp is optimally operated independently of temperature.

Description

The invention relates to a control device for a gas discharge lamp.

In gas discharge lamps generally known as fluorescent tubes, especially in compact fluorescent lamps, as compact fluorescent lamps with standardized screw bases are now used as energy-saving lamps, the temperature of the lamp and the screw socket installed in the compact fluorescent lamp The temperature of the electronic circuit of the lamp has an influence on the light output at a predetermined lamp current. Because the external temperature deviates from the predetermined rated temperature value, for example, it deviates downward when it is outdoor lighting, and it deviates upward when it is indoor lighting, which will lead to a decrease in light output and luminous flux. Due to the small structure of the compact fluorescent lamp, its heat dissipation is limited, so The lamp must be allowed the maximum current and be at the maximum allowable load of the compact fluorescent lamp under the premise of considering the worst case.

The object of the present invention is to obtain a control device for a gas discharge lamp, in particular a compact fluorescent lamp with a ballast integrated in its lampholder, which largely eliminates the above-mentioned disadvantages, and the tube The temperature-dependent variable current emitted guarantees maximum light output over a wide temperature range. The light output of the gas discharge lamp should also be at least approximately constant in the event of temperature fluctuations.

The control device according to the invention can solve these problems. The control device of the gas discharge lamp comprises an electronic circuit and a capacitor connected in parallel with the gas discharge lamp, and the above electronic circuit comprises a rectifier, a filter, an oscillation circuit, a high frequency oscillation circuit, a decoupling capacitor and a third transformer as a current limiter The control device also includes a temperature compensation element, which controls the current of the gas discharge lamp as the external temperature changes. The temperature compensation element is a current-limiting reactance coil whose induction can change with temperature. The above-mentioned current-limiting reactance The coil includes a coil, and a movable iron core is installed in the center along the coil axis. One side of the iron core is provided with elastic force by a spring, and the other side of the iron core is provided with elastic force by a bimetallic spring. The depth to which the core enters the coil is temperature dependent.

Advantageous structural variants of the invention are explained below with the aid of the drawings. In the attached picture:

Fig. 1 is a block diagram of a control device according to the invention and a gas discharge lamp controlled by it;

Figure 2 is an advantageous circuit diagram of the ballast and the temperature compensation element connected in series with it and the electronic circuit of the compact fluorescent lamp;

Figure 3 is a detailed partial cross-sectional view of a preferred temperature compensating element for use in the circuit of Figure 2 at lower temperatures;

Figure 4 is a diagram of the temperature compensation element according to Figure 3 used at higher temperatures;

Figure 5 is a top view of the temperature compensating element according to Figures 3 and 4 mounted in a lampholder; and

FIG. 6 is a partial cross-sectional view of the lamp socket of FIG. 5 .

FIG. 1 shows a block diagram of a control device for a gas discharge lamp 1 . The control device comprises an electronic circuit 2 for use in an electronic ballast (mainly involving a high frequency (HF) generator), with a temperature compensating element 3 connected in series. Like a general gas discharge lamp, a capacitor 4 is connected in parallel with the fluorescent tube in order to start the gas discharge.

FIG. 2 shows a preferred embodiment of the electronic circuit 2 . Wherein the power supply voltage such as 220V+10%, 50-60 Hz is applied to terminals 5 and 6. The fuse Si ensures that when the electronic circuit 2 fails, especially when a short circuit occurs, no harm caused by a large current will occur. Diodes D1, D2, D3 and D4 and first and second capacitors C1 and C2 are used as a rectifier, and the choke DR and third capacitor C3 are used as a smoothing network and connected to the positive output of the rectifier. The start-up circuit composed of the first resistor R1, the fourth capacitor C4, the fifth diode D5 and the two-terminal AC switching semiconductor element (Diac) DIA ensures that when the power supply voltage is connected to the terminals 5 and 6, it is powered on one side. On the first transformer (Strom Ubertrager) coil TR1 A, base resistor R2 in series with it, first transistor T1 and emitter resistor R3 and on the other side of it the second transformer coil TR1 B, in series with it The high-frequency oscillation circuit composed of the base resistor R4, the second transistor T2 and the emitter resistor R5 is in an oscillating state. Two additional diodes D6 and D7 and an RC network consisting of a sixth resistor R6 and a sixth capacitor C6 are used to stabilize the frequency of the high frequency oscillating circuit. The gas discharge lamp 1 (here is a small fluorescent lamp) is connected in series with the high-frequency oscillating circuit through the fifth capacitor C5 and the third transformer coil TR1 C, wherein the temperature compensation element 3 (here based on the current-limiting reactance coil L whose induction changes with temperature form) is also connected therebetween, and the capacitor 4 is connected in parallel to the gas discharge tube or rather between the electrodes 7 and 8.

It can be seen from Fig. 3 and Fig. 4 a preferred arrangement of a current-limiting reactance coil L which acts as a temperature compensating element 3 and whose inductance (impedance) varies with temperature. Clearly, this involves a coil 9, in the center of which is provided a movable core (preferably a ferrite core 10). On one side of the core, the elastic force is applied to the core through the spring 11 in the axial direction of the coil 9, and on the other side, a temperature-sensitive spring (preferably a bimetallic spring 12) is pressed against the core so that the ferrite How much the iron core 10 enters the coil 9 is related to the external temperature. The preferred method of adding the force of the two springs 11 and 12 here should be able to realize that the current-limiting reactance coil L presents a predetermined impedance at a predetermined temperature, and the impedance should conform to the calculated value, and the current-limiting reactance coil L must present this impedance value , whereby the current drawn by the gas discharge lamp 1 should be such that its maximum light output is obtained precisely under its operating conditions.

When the external temperature is lower than the rated temperature, the ferrite core 10 will come out of the coil 9 through the action of the spring 11, which will cause the impedance of the current-limiting reactance coil L to decrease, so that the current of the lamp will increase. The temperature-dependent loss in the light output of the gas discharge lamp 1 is therefore compensated by increasing the lamp current.

On the contrary, when the outside temperature is higher than the rated temperature, the ferrite core 10 enters the coil 9 again by the force of the bimetal spring 12, so that the inductance of the current-limiting reactance coil L is increased. The current to the lamp therefore drops. In this way, an increase in the light output of the gas discharge lamp 1 due to an excessively high temperature can be counteracted. It can be clearly seen from FIGS. 3 and 4 that the coil 9 with the ferrite core 10 and the two springs 11 and 12 are housed in the housing 13 .

It can be clearly seen from Fig. 5 and Fig. 6 that the more suitable way for the housing 13 is by the lamp holder Composition, in which both ends of a gas discharge lamp 1 with electrodes 7 and 8 are inserted, and a coil 9 with a ferrite core 10 and springs 11 and 12 are embedded in the lower part thereof. This arrangement is therefore particularly advantageous, since the temperature compensating element 3 is thus placed exactly where the maximum temperature difference between the cooler and the hotter gas discharge lamp 1 occurs. Thus without long warm-up or cool-down phases, the temperature compensating element 3 automatically influences the lamp current so that there is practically no difference in illuminance to the naked eye between cooler and warmer surroundings.

Those skilled in the art can know that the gas discharge lamp according to the present invention, especially the control device for compact fluorescent lamps, not only brings physiological benefits, but also makes the illuminance independent of temperature, so that the gas discharge lamp can be optimally illuminated without being affected by temperature .

It goes without saying that the control device according to the invention is not restricted to use with compact fluorescent lamps, but can also be used particularly effectively for virtually any gas discharge lamp. The temperature compensating element 3 used here does not have to be placed in the lamp holder and can also be placed in other parts that are more sensitive to temperature.

Those skilled in the art can realize that, for example, the temperature-affected element can be used to replace the adjustable temperature-affected current-limiting reactance coil L, and it is correspondingly connected to the electronic circuit 2 to affect the frequency of the high-frequency oscillation circuit, thereby affecting the lamp current to produce the desired effect.

It goes without saying that a control device with electronic circuit 2 can be configured differently from the described circuit diagram. In addition, it is not necessary to place the electronic circuit 2 and the temperature compensating element 3 separately as illustrated in the figure. It can be understood that, in order to obtain expected results, the current-limiting reactance coil L may not necessarily be designed in the manner depicted and illustrated in the figure. All structural and circuit-technical changes of the control device according to the invention are within the scope of the invention, that is to say, specialists can implement them without having to do creative work themselves. No further mention is needed here.

Claims (2)

1, the control device of a kind of gaseous discharge lamp [1], comprise electronic circuit [2] and the capacitor [4] in parallel, and above-mentioned electronic circuit [2] comprises rectifier and filter [C1, C2 with gaseous discharge lamp [1], C3, D1, D2, D3, D4, DR], start-oscillation circuit [R1, C4, D5, DIA], high-frequency oscillating circuits [R2-R6, T1, T2, D5, D6, C6, TRIA, TRIB], decoupling capacitor [C5], with the 3rd transformer coil [TR1 C] as flow restricter, it is characterized in that also comprising a temperature compensating element [3], it is controlled the electric current of gaseous discharge lamp [1] with the variation of ambient temperature, and said temperature compensating element, [3] can temperature-dependent current-limiting reactor coil [L] for its induction, and above-mentioned current-limiting reactor coil [L] comprises coil [9], coil axis installation one along the line in the central is [10] unshakable in one's determination movably, a side unshakable in one's determination adds elastic force through spring [11], and opposite side unshakable in one's determination adds elastic force through bimetallic spring [12], and it is relevant with temperature that this iron core enters the degree of depth of coil [9].

2, control device as claimed in claim 1 is characterized in that the said temperature compensating element, is contained in the housing (13) that contains lamp socket.

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