JP3355637B2 - Fluorescent lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a fluorescent lamp, and more particularly to a fluorescent lamp for preventing a malfunction of a television, an audiovisual device or the like by a remote control operation of a television or an audiovisual device when the fluorescent lamp is turned on. Of the lighting device .

[0002]

2. Description of the Related Art Conventionally, some fluorescent lamp lighting devices include a plurality of high-frequency lighting fluorescent lamps and a lighting circuit for lighting the fluorescent lamps. In this type of lighting device, the lamp oscillates at a unique frequency, and the fluorescent lamps are lit at the unique oscillation frequency. As an example of such a lighting device, there is a circuit shown in FIG. In FIG. 5, reference numerals 50 to 52 denote high frequency lighting fluorescent lamps, and high frequency lighting circuits 53 to 55 are circuits for lighting these high frequency lighting fluorescent lamps 50 to 52. These high-frequency lighting circuits 5
3 to 55 are connected to an AC power supply line. As the above-mentioned fluorescent lamps, it has been described a fluorescent lamp for illuminating the supply of the high-frequency power, which includes a discharge lamp for lighting a high frequency power.

[0003]

However, in this type of conventional lighting device, the high-frequency lighting circuits 53 to 55 have high-frequency lighting fluorescent lamps 50 to 52 at their own oscillation frequencies.
The lighting frequencies of the high-frequency lighting circuits 53 to 55 are mutually changed due to the spread of audiovisual (hereinafter, referred to as “AV”) devices equipped with a remote control (“remote control”) device using infrared rays. In some cases, generating pseudo remote control signals. In this remote control device, the lighting frequencies of a plurality of fluorescent lamps interfere with each other, and control is disturbed by a pseudo remote control signal that causes a malfunction of an AV device or the like. As a result, malfunction of the AV device or the like may occur. Was. Therefore, in the remote control device, a process for preventing the lighting frequencies of the plurality of fluorescent lamps from interfering with each other and causing a malfunction of the AV device or the like is required. However, since the process is complicated, This was a factor that increased costs. Further, in the conventional fluorescent lamp lighting device, the frequency is set in advance, and the interference of the frequency cannot be easily prevented based on the set frequency.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluorescent lamp lighting device having a simple structure for preventing interference of lighting frequencies based on preset frequencies when a plurality of fluorescent lamps are turned on. is there.

[0005]

According to the present invention, there is provided a lighting device for a fluorescent lamp comprising lighting circuits respectively corresponding to a plurality of fluorescent lamps, wherein each lighting circuit of the plurality of lighting circuits is provided. A high voltage generator for generating a high voltage having a frequency corresponding to the applied frequency signal and lighting one fluorescent lamp driven by the lighting circuit; and a frequency signal generator for generating a first frequency signal A variable frequency divider for dividing a frequency of an input signal by a set frequency division ratio and outputting a signal of a second frequency; a first frequency signal generated by the frequency signal generating unit; A phase comparison unit that compares the phases of the second frequency signal divided by the variable frequency divider and outputs a voltage signal indicating the phase difference between them, and a signal of a third frequency corresponding to the output voltage of the phase comparison unit And generates a third frequency signal by the variable frequency divider. And a voltage-controlled oscillator for outputting to the high-voltage generator, and a switch for setting the frequency division ratio set in the variable frequency divider, wherein the one fluorescent light is driven by the high-voltage generator. The variable frequency division is performed by the switch so that the driving frequency of the lamp is set to a driving frequency that does not cause interference with the lighting light of another fluorescent lamp located at a position that interferes with the lighting light of the one fluorescent lamp. A lighting device is provided, wherein the frequency division ratio of the lamp is settable.

[0006]

In each lighting circuit, a frequency synchronizing circuit (PLL circuit) is constituted by a frequency signal generating section, a variable frequency divider, a phase comparing section, and a voltage controlled oscillator. A synchronized signal having no phase difference between the frequency signal and the second frequency signal from the variable frequency divider is generated. The PLL circuit functions as a frequency synthesizer and generates a set frequency signal. The setting is made with the switch. The frequency signal generated by the PLL circuit is applied to the high voltage generating unit, and the high voltage generating unit generates a frequency and voltage signal for driving the fluorescent lamp, and drives the fluorescent lamp.
The setting of the frequency division ratio in the variable frequency divider by the switch sets the driving frequency of the fluorescent lamp driven by the high-voltage generator,
The driving frequency is set so as not to cause interference with the lighting light of another fluorescent lamp located at a position that interferes with the lighting light of the fluorescent lamp.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A lighting device for a fluorescent lamp according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram showing an embodiment of a fluorescent lamp lighting device according to the present invention, and FIG. 2 is a schematic explanatory view showing the entire configuration of the fluorescent lamp lighting device of the present invention. In these figures, reference numeral 1 denotes a high-frequency lighting circuit for lighting the high-frequency lighting fluorescent lamp 2, and the high-frequency lighting circuit 1 includes a generator 3 for generating a high voltage and a frequency synthesizer 4 for setting a lighting frequency. It is configured. In FIG. 2, high-frequency lighting fluorescent lamps 2 are high-frequency lighting fluorescent lamps 2A to 2A.
C, the high-frequency lighting circuit 1 for lighting these high-frequency lighting fluorescent lamps 2A to 2C is a high-frequency lighting circuit 1A to 1C. In these configurations, three identical configurations are connected along a power supply line.

[0008] The high voltage generating section 3 has an AC voltage of 100 V
Is a rectifier consisting of a bridge circuit input from the A and C nodes
A circuit 5, a resistor 6 connected between the D node and the E node of the rectifier circuit 5, a capacitor 7 connected between the E node and the F node, a capacitor 8 connected between the G node and the H node, a diode 9 connected in reverse direction between H node and I-node, switch connected between the J nodes and K node
One of the choke coil 10, the K node and the collector of the choke coil 10 are connected, the transistor 11 whose emitter is connected to the I node, the electrode 2b of the fluorescent lamp 2, and the other are connected to the K node. Chokeco
And a drive circuit for controlling the base voltage of the transistor 11 to operate the transistor 11. Therefore, the high voltage generator 3, by operating the driving circuit 13, the high to operate the transistor 11
Frequency power is supplied to the fluorescent lamp 2 to turn on the fluorescent lamp. Reference numeral 14 denotes a condenser, which is a light source for the fluorescent lamp 2.
This is a capacitor for preheating the heaters 2a and 2b .

[0009] The frequency synthesizer section 4 has a function of f _o [H
an oscillator 24 that oscillates at a frequency of z], a frequency divider 23 that divides the output of the oscillator 24 to 1 / N (N is an integer), a changeover switch 26 that previously sets the frequency to a predetermined frequency division ratio,
When the frequency setting switch 26 is turned on, 1 / M (M
, A variable frequency divider 25 for dividing the frequency by an integer, a phase comparator 20 for comparing the phase based on the output of the variable frequency divider 25 and the output of the frequency divider 23, and an output of the phase comparator 20. An integrator 21 that integrates a voltage, and an output frequency f [Hz] is set based on the output of the integrator 21, and the output frequency f [H] is set.
z], and a voltage variable oscillator 22 that operates the drive circuit 13 of the high voltage generator 3. Therefore, in the frequency synthesizer 4, after the phases of the set output frequency and the frequency f _o compared in the phase comparator 20, it is obtained by integrating the phase error component signal to be output from the phase comparator 20 in the integrator 21 Variable oscillator 22 based on the output
Thus, the driving circuit 13 can be driven by setting the oscillation frequency f [Hz].

At this time, the frequency setting switch 2
The frequency can be easily changed by switching of 6.
Runode, it is possible to eliminate rapidly by switching interference of the switch 26 of the lighting frequency. In this frequency synthesizer, operating frequency f, and the dividing ratio M, the frequency f _o, can be expressed as the frequency division ratio 1 / N relationship following the between (1). f / M = f _o / N (1) Then, the operation is performed based on (1). That is, the lighting frequency in this case is _{f = f o · M / N} (2). Here, when the frequency division ratio M in equation (2) is varied, the lighting frequency f is varied. For example, frequency f _o = 1M
When z, N = 1000 and M = 40, the lighting frequency f =
40 kHz.

The above is described in detail with reference to FIGS. The frequency setting switch 26 will be described by, for example, switching between the frequency setting switches 26A and 26B. The frequency setting switch 26A turns off the switches 26a and 26c,
When the switch 26d is turned on, it is assumed that the fluorescent lamp 2A is turned on from the frequency synthesizer unit 4A via the high voltage generation unit 3A, and light emission A is generated as shown in FIG. FIG. 4A shows the light intensity converted into an electric signal (voltage) by photoelectric conversion means (not shown) at this time.
Thus, the light emission A in FIG. 3 periodically emits light _every t1 hours. At this time, for example, the frequency setting switch 2
6B turns on the switch 26a and the switch 26c,
When the switch 26b and the switch 26d are turned off, it is assumed that the fluorescent lamp 2B is turned on from the frequency synthesizer unit 4B via the high voltage generation unit 3B, and light emission B occurs as shown in FIG. In this case, in the photoelectric conversion unit the intensity of light which is expressed upon converted in (not shown) into an electric signal (voltage) FIG. 4 (B), the emission B is t ₂ hours of 3, i.e. emission A longer to turn than _{t 1} hour. Under the above conditions , the light emission A and the light emission B cause interference as shown in FIG. Cause. At this time, for example, the frequency setting switch 2
By setting the switches 26a to 26d of 6A and 26B to be the same, the frequency setting changeover switch 26
A, 26B, the frequency synthesizers 4A, 4B, and the high-voltage generators 3A, 3B, the same level of light emission of the fluorescent lamps 2A, 2B can be defined. At this time, light interference can be prevented. Accordingly, by setting the switches 26a to 26d of the frequency setting changeover switches 26A and 26B to be the same, light interference can be easily prevented.

In this embodiment, by varying the lighting frequency of a high-frequency lighting fluorescent lamp, a frequency which does not interfere with remote control devices such as video and audio devices, which has been a problem in the past, is appropriately selected. It can be used. Further, in the present embodiment, an excellent effect is obtained in that a plurality of high-frequency lighting fluorescent lamps are turned on to easily perform a simulation of a malfunction of an infrared recommon device due to interference of lighting frequencies.

Although the high-frequency fluorescent lamp has been described in the above embodiment, the present invention can also be applied to a discharge lamp or the like which can be lit at a high frequency, and similarly, it is possible to eliminate a malfunction of the remote control device. Needless to say, excellent effects such as these can be achieved.

[0014]

As described above, according to the present invention, by changing the lighting frequency of a high frequency lighting fluorescent lamp, video,
It is possible to appropriately select and use a frequency that does not interfere with a remote control device such as an audio device.
In addition, it is possible to obtain an excellent effect such that it becomes easy to simulate a malfunction of the infrared recommon device due to the interference of the lighting frequencies by lighting a plurality of high frequency lighting fluorescent lamps.

[Brief description of the drawings]

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

FIG. 2 is a schematic explanatory view showing the overall configuration of a fluorescent lamp lighting device according to the present invention.

FIG. 3 is a diagram for explaining the operation of the fluorescent lamp lighting device of the present invention.

FIG. 4 is a diagram showing a timing chart in which a light emitting state in a main part of FIG. 1, which is an embodiment of the fluorescent lamp lighting device of the present invention, is photoelectrically converted into an electric signal (voltage).

FIG. 5 is a schematic explanatory view showing the entire configuration of an example of a conventional fluorescent lamp lighting device.

[Brief description of reference numerals]

DESCRIPTION OF SYMBOLS 1 Lighting circuit 1A-1C Lighting circuit 2 High frequency lighting fluorescent lamp 2A-2C High frequency lighting fluorescent lamp 3 High voltage generation part 4 Lighting frequency setting part 5 Rectifier circuit 10 Choke coil 11 Transistor 12 Choke coil 13 Drive circuit 14 Capacitor 20 Phase comparison circuit Reference Signs List 21 integrator 22 variable voltage oscillator 23 frequency divider 24 oscillator 25 variable frequency divider 26 frequency setting switch

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-74066 (JP, A) JP-A-63-313499 (JP, A) JP-A-1-167799 (JP, A) JP-A-2- 98216 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H05B 41/24

Claims (1)

(57) [Claims] 1. A fluorescent lamp lighting device comprising a lighting circuit corresponding to each of a plurality of fluorescent lamps, wherein each lighting circuit of the plurality of lighting circuits has a frequency corresponding to an applied frequency signal. A high voltage generator for generating a high voltage to light one fluorescent lamp driven by the lighting circuit, a frequency signal generator for generating a first frequency signal, and setting a frequency of the input signal. A variable frequency divider that outputs a signal of a second frequency by dividing the frequency by the divided frequency ratio, a first frequency signal generated by the frequency signal generator,
A phase comparison unit that compares the phases of the second frequency signal divided by the variable frequency divider and outputs a voltage signal indicating the phase difference between the second frequency signal and a third frequency signal corresponding to an output voltage of the phase comparison unit; A voltage-controlled oscillator that generates a signal and outputs a third frequency signal to the variable frequency divider and the high-voltage generator; and a switch that sets the frequency division ratio set in the variable frequency divider. The driving frequency of the one fluorescent lamp driven by the high-voltage generating unit is adjusted so that the driving frequency of the one fluorescent lamp does not interfere with the lighting light of another fluorescent lamp located at a position that interferes with the lighting light of the one fluorescent lamp. Wherein the frequency division ratio of the variable frequency divider can be set by the switch so that the driving frequency is as high as possible.
Lighting device.