JPH06208896A - Fluorescent lamp lighting device - Google Patents

Abstract

PURPOSE:To provide a fluorescent lamp lighting device excellent in general purpose applicability for numerous kinds of fluorescent lamps by changing a DC flowing in a control coil so as to control inductance of a choke coil. CONSTITUTION:A circuit comprises a high frequency inverter 23 where a commercial power source 21 is used as an input source; a choke coil 37 (L-1-L-n) connected between one end of an output of the high frequency inverter and a load wiring system 24; (n) fluorescent lamps (FL-1-FL-n); and a capacitor 27 (C-1-C-n) connected in parallel to the fluorescent lamps and constituting a direct resonance circuit together with the choke coil 37 (L-1-L-n). The choke coil 37 constitutes a variable inductance 25 which can be varied by a DC (i) flowing in a control coil 41 (M-1-M-n) disposed in magnetic paths having a common impedance value. A switch circuit 30 is incorporated for selecting a DC value flowing in the control coil 41 from four predetermined DC current values.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp lighting device equipped with a high-frequency inverter device, and more particularly, to a fluorescent lamp lighting device supplier / builder for various types of fluorescent lamps having various different power consumptions. The present invention relates to a fluorescent lamp lighting device having excellent versatility, which can be dealt with by setting a simple changeover switch at the time of shipment.

[0002]

2. Description of the Related Art At present, fluorescent lamps are used as a main power source of lighting equipment for various purposes, but unlike a light bulb, a fluorescent lamp cannot be turned on simply by being connected to a power source and a ballast is required. A fluorescent lamp lighting device is configured with a ballast.

The types of fluorescent lamp lighting devices described above have reached a considerable number in combination with the economical efficiency of fluorescent lamps and the development of new lighting systems.

The following is an overview of fluorescent lamp lighting devices by system, standard, and product type. First, the types of ballasts based on the lighting system are (1) glow start type, (2) rapid start type, and (3) electronic start type. , (4) Inverter type,
(5) There are direct current lighting type and the like.

The types of fluorescent lamps based on power consumption (tube voltage, tube current) are 4, 6, 8, 9, 10, 13, 15, 18,
20, 23, 25, 27, 28, 30, 32, 35, 3
There are 6, 40, 55, 65, 96, 110 ... (W) etc., and there are more than 20 kinds.

The types of tube shapes are (1) straight tube type,
(2) Slim type, (3) Round type, (4) Twin type, (5)
There are U shape, (6) spherical shape, and the like.

The type according to the adaptive power supply voltage is (1) 100
V, (2) 200 V, and types of adaptive power supply voltage depending on the frequency are (1) 50 Hz and (2) 60 Hz.

In addition, there are differences in the arrangement relationship between the ballast and the fluorescent lamp, differences in power factor level, and the like.

As described above, thousands of types of fluorescent lamp lighting devices can theoretically be obtained by combining the above-mentioned methods, standards and types.

In the various lighting systems described above, an inverter type fluorescent lamp lighting device, which is related to the present invention and is being rapidly adopted for various purposes, will now be outlined.

FIG. 4 is a block circuit diagram of the most general and simple inverter type fluorescent lamp lighting device. After the commercial AC power supply 2 is turned on, the high frequency inverter device 1 is a series resonance circuit composed of a choke coil 3 and a capacitor 5. Resonance frequency fr
A current is output at a frequency fo equivalent to (E), and a high voltage is generated at both ends of the fluorescent lamp 7 of the load wiring system by the resonance action, and the fluorescent lamp 7 is lit. After lighting, the tube current ir flows, the resonance action disappears, the output frequency shifts to a frequency lower than the resonance frequency fr, and a stable lighting state is achieved at a low voltage.

That is, in FIG. 4, the fluorescent lamp lighting device 10 is shown.
Is a high frequency inverter device 1 having a commercial resonance power supply 2 (50/60 Hz) as an input and a series resonance circuit composed of a choke coil 3 (inductance L) and a capacitor 5 (capacity C) as a load circuit. ,

[0013]

[Equation 1]

A single frequency fo near the resonance frequency fr represented by (E) is output (E), and a high voltage is generated by the resonance action to turn on the light. Is configured to be.

This method has the advantages that it is easy to control and can be manufactured at low cost, and it is expected that it will become more popular in the future.

In order to obtain a proper tube voltage and tube current depending on the type of fluorescent lamp used, it is necessary to preset the capacitance of the capacitor and the inductance of the choke coil according to the fluorescent lamp. Since the capacitor is arranged in the lighting equipment of the load wiring system, it is not easy to replace it once it is arranged.

Also, the choke coil is generally incorporated in the high frequency inverter device, and replacement is difficult.

Therefore, various fluorescent lamp lighting devices can be considered according to the number of types of fluorescent lamps used.

[0019]

However, as mentioned above, the vast variety of fluorescent lamps and fluorescent lamp lighting devices at the present time has a wide range of options from the viewpoint of consumers.
While there is an advantage that you can purchase fluorescent lamp lighting devices according to scale, budget and purpose, for fluorescent lamp lighting device supply / installers, you always have fluorescent lamp lighting devices of various various standards Since it is necessary to promptly respond to the demand of, the result is a huge and complicated inventory management.

Therefore, needless to say, from the viewpoint of the supplier / constructor, there is a strong demand for organizing the types of the fluorescent lamp lighting devices to reduce the cost of inventory management.

On the other hand, the above-mentioned resonance type inverter type fluorescent lamp lighting device can be commonly used for the type depending on the frequency of the adaptive power supply voltage, but the proper tube voltage and the proper tube current differ depending on the power consumption of the fluorescent lamp as a load. The appropriate value of the inductance of the choke coil that carries out the current limiting action also differs depending on the fluorescent lamp used. However, it is difficult to replace the choke coil as described above, and the fluorescent lamp lighting device has not been commonly used.

The present invention has been made in view of the above circumstances, and is premised on the adoption of an inverter type fluorescent lamp lighting device which is rapidly spreading because of low cost and high functionality of electronic parts. , The type of ballast by the lighting system,
An effective means for rationalizing the inventory management of the supply / constructor by enabling common use of each fluorescent lamp lighting device for the type of fluorescent lamp depending on the power consumption (tube voltage, tube current) and the type depending on the frequency of the adaptive power supply voltage. The present invention provides a fluorescent lamp lighting device.

[0023]

The present invention relates to a high frequency inverter device, a choke coil connected between one end of the output of the inverter device and a load wiring system, a fluorescent lamp as the load wiring system and the fluorescent lamp. In a fluorescent lamp lighting device including a capacitor that is connected in parallel and that forms a series resonance circuit with the choke coil, the choke coil is variable by a direct current flowing through a control coil having a common inductance path. To provide a fluorescent lamp lighting device characterized in that a changeover switch circuit for selecting a DC current value to flow in the control coil from a plurality of preset DC current values is incorporated. Thus, the above object is achieved.

[0024]

The inductance of the choke coil of the fluorescent lamp lighting device according to the present invention is controlled by changing the direct current flowing through the control coil in the variable inductor composed of the choke coil wound around the magnetic core and the control coil. .

That is, the magnetic path in the magnetic core created by the control winding passes through the cross section of the choke coil winding to change the strength of magnetization of the choke coil. Therefore, since the inductance control is DC control, it is very easy to control the inductance value of the choke coil.

Further, the inductance value of the choke coil forming the series resonance circuit can be selected by the changeover switch, and the output current of the high frequency inverter device is controlled by the current limiting action of the choke coil. It is possible to change the proper tube voltage and the proper tube current according to the type of fluorescent lamp and the power consumption.

Therefore, one fluorescent lamp lighting device can be applied to several kinds of fluorescent lamps having different power consumptions.

Further, since it is an inverter type, it can be applied regardless of the frequency of the AC power source used (50/60 Hz).

As a result of the above, the types of fluorescent lamp lighting devices are reduced, and the stock management of the fluorescent lamp lighting device supply / constructor is rationalized.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fluorescent lamp lighting device according to the present invention will be described in detail with reference to FIGS.

FIG. 1 is a circuit example of a fluorescent lamp lighting device according to the present invention, FIG. 2A is a circuit diagram of a variable inductor, and FIG. 2B is a plan view showing a winding structure of the variable inductor. Is. FIG. 3 is a control coil DC current characteristic diagram of the inductance of the variable inductor.

In FIG. 1, a fluorescent lamp lighting device 20 includes a high frequency inverter device 23 which receives a commercial power source 21 and a choke coil 37 (L-L) connected between one end of the output of the high frequency inverter device and a load wiring system 24. 1-Ln)
And n sets of fluorescent lamps as the load wiring system (FL-1 to FL
-N) and a capacitor 27 (C-1 to Cn) that is connected in parallel to each of the fluorescent lamps and forms a series resonance circuit with the choke coil 37 (L-1 to Ln). In the configuration, the choke coil 37 (L-1 to Ln) is variable depending on the direct current i flowing through the control coil 41 (M-1 to Mn) arranged in a magnetic path having a common inductance value. The present invention is characterized in that the variable inductor 25 is incorporated, and a changeover switch circuit 30 for selecting a direct current value to be passed through the control coil 41 from a plurality of preset direct current values (four values) is incorporated.

At this time, the control coils 41 (M-1 to M-) connected in series inside the high frequency inverter device 23.
A DC auxiliary power supply 29 for supplying a DC current i flowing in n) is provided.

Next, the variable inductor 25, which is the main part of the present invention, is represented by a circuit as shown in FIG. 2A. For example, as shown in FIG. 2B, two E-shaped magnetic cores 31 are provided. , 32 are opposed to each other, a choke coil 37 is wound around a central magnetic leg 35 of the magnetic core, and control coils 41 are divided and wound around side magnetic legs 39 and 40, respectively. At this time, the gap 43 is provided in the magnetic path between the central magnetic legs of the choke coil 37, and the magnetic path in the side magnetic leg of the control coil 41 is set to have no gap.

Control coil 41 of the variable inductor 25
FIG. 3 shows the inductance characteristic of the choke coil 37 when a direct current i is applied to the choke coil 37. From the figure, it can be seen that there is a negative characteristic in which the inductance L decreases as the direct current i increases.

The inductance L of the choke coil 37 (L-1 to Ln) in each variable inductor 25 described above.
Are n control coils 41 (M-1 to M) connected in series.
DC current i flowing through the switch circuit 30
The switch SW is appropriately selected according to the power consumption.
For example, as shown in FIG. 1, four resistors R1 to R4 (R1
<R2 <R3 <R4), the direct current i of the control coil 41
Is preset to be selected from four values (i1>i2>i3> i4), the inductance L of the choke coil 37 is different from the other four values (L) as shown in FIG.
It can be seen that it can be appropriately selected from 1 <L2 <L3 <L4) according to the fluorescent lamp used.

Therefore, the supplier / constructor of the fluorescent lamp lighting device can immediately respond to various requests simply by setting the changeover switch SW in accordance with the specifications required by the purchaser at the time of shipping, which is a huge variety. The need to prepare a fluorescent lamp lighting device is eliminated, and inventory management becomes easy.

It should be noted, however, that it should be noted that, by changing the inductance L of the choke coil 37, the resonance frequency fr of the series resonance circuit also changes. In the fluorescent lamp lighting device, the tube applied voltage required to start lighting does not have to have the resonance frequency fr equal to the frequency fo of the high frequency output current, but it is sufficient if the resonance frequency fr is approximately in the vicinity, and the allowable range is wide. Therefore, if the value of each of the inductances L set in advance is set within the allowable range, no trouble will occur. In practical application, it is desirable to classify more than 20 types of fluorescent lamps with different power consumption into about 3 groups with the tube voltages approximate to each other.

The winding structure of the variable inductor 25 is not limited to the structure in which the choke coil and the control coil are separately wound around the magnetic core in which two E-shaped magnetic cores are combined as in this embodiment. Since the shape of the magnetic core that realizes the inductor and the winding state and positional relationship of each winding are variously considered, it goes without saying that the present invention extends to other winding structures that realize these variable inductors.

Further, although the circuit configuration for turning on a plurality of fluorescent lamps is used in this embodiment, it goes without saying that one fluorescent lamp may be used.

Further, although the number of selected choke coil inductances by the switch SW in the changeover switch circuit 30 of the present embodiment is four, it is not limited to this, and may be several tens, for example. However, it may be stepless by a variable resistance.

[0042]

Since the fluorescent lamp lighting device according to the present invention is constructed as described above, it has the following effects.

(1) It is applicable to several types of fluorescent lamps with different power consumption, and has an excellent effect of being versatile.

(2) Further, the fluorescent lamp lighting device can be commonly used, and it has an excellent effect that it becomes an effective means for rationalizing the inventory management of the supplier / constructor.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a fluorescent lamp lighting device according to the present invention.

FIG. 2A is a circuit diagram of a variable inductor,
(B) is a plan view showing a winding structure of the variable inductor.

FIG. 3 is a control coil DC current characteristic diagram of the inductance of the variable inductor.

FIG. 4 is a block circuit diagram of a conventional inverter type fluorescent lamp lighting device.

[Explanation of symbols]

 E Inverter output C-1 to Cn Capacitor L-1 to Ln Choke coil M-1 to Mn Control coil FL-1 to FL-n Fluorescent lamp L1 to L4 Inductance value i, i1 to i4 Control coil DC current ir Tube current fo Output current frequency fr Resonance frequency 1 High frequency inverter device 2 Commercial AC power supply 3 Choke coil 5 Capacitor 7 Fluorescent lamp 10 Fluorescent lamp lighting device 20 Fluorescent lamp lighting device 21 Commercial power supply (50/60 Hz) 23 High frequency inverter Device 24 Load wiring system 25 Variable inductance 27 Capacitor 29 DC auxiliary power supply 30 Changeover switch circuit 31, 32 E-shaped magnetic core 33 I-shaped magnetic core 35 Central magnetic leg 37 Choke coil 39, 40 Side magnetic leg 41 Control coil 43 Gap

Claims (1)

[Claims] 1. A high-frequency inverter device, a choke coil connected between one end of an output of the inverter device and a load wiring system, a fluorescent lamp as a load wiring system, and the choke coil connected in parallel to the fluorescent lamp. And a capacitor forming a series resonance circuit, and a variable inductor in which the choke coil is made variable by a direct current flowing through a control coil having a common inductance path, A fluorescent lamp lighting device, comprising a changeover switch circuit for selecting a direct current value to flow through the control coil from a plurality of preset direct current values.