JPS609098A - Multilamp discharge lamp firing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for lighting a plurality of discharge lamps using one high frequency inverter.

In fields such as display devices and OA equipment, a plurality of discharge lamps may be lit. This type of lamp (hereinafter referred to as a lamp) is used under special usage conditions 1, for example, when it is used by blinking for a short period of time.

For example, attempts have been made to use an inverter to generate bulk frequency lighting. If a plurality of lamps are simply to be lit continuously, a conventional technique is known in which a plurality of lamps are lit in series using one inverter. However, each lamp is turned on only for a desired period. Alternatively, in applications where lighting is repeated in sequence, it has been common to use one inverter for each two bulbs to control lighting.

In conventional devices, one inverter lights one lamp or one set of lamps as described above. required an inverter. For this reason, there was a drawback that the entire device was expensive and easily increased in size.

The present invention was made in order to eliminate the drawbacks of the conventional device as described above, and an object of the present invention is to provide a device that can light a plurality of lamps with one inverter by providing a switch device for the plurality of lamps. It is said that

Hereinafter, nine detailed explanations of the present invention will be given. FIG. 1 shows an embodiment of the device according to the invention, and FIG.

This is an example of a switch device used for this purpose.

In Fig. 1, (1) is a DC power supply, (2) is an inverter that supplies high-frequency power, and (3) is a first current-limiting impedance, including discharge lamps (4a), (4b), (
4c) is used to limit the current, and a capacitor, a choke coil, etc. are used, and in this case, a choke coil is used. (5a), (5b), and (5c) are switch devices. In Figure 2, (iSa) is a full-wave rectifier circuit.

(7a) is a transistor that operates as a switch, and (8) is a transistor that operates as a switch.
c) is a control device that sequentially opens and closes. Now, when the switch device (5a) is conducting, (5b), (5c)
is blocked.

(When 5b% is conducting, (5a) and (5c) are cut off, and the switch device is opened and closed in sequence.

With the above configuration, the switch device (5a)
When you close the lamp (4a) lights up and the primary (5a), (
When (5b) is closed using 5c), the lamp (4b) lights up.

In this way, each lamp can be turned on in a desired order and for a desired period using one inverter (2) according to the signal from the control device (8). FIG. This is an example in which two or more lights can be turned on at the same time.

In addition, in this embodiment, lamps (4a), (4b),
Even if the current values of (4c) are different, lighting can be achieved by setting the second current limiting impedances (10a), (10b), and (10c) to different values. In this example, 1 For example, (4a), (4b) is turned off 2nd (4b),
It is also possible to operate (4c) to turn on and 4a) to turn off, and this can be realized by a control signal from a control device (not shown). Alternatively, a first current-limiting impedance having the same type of actance may be connected in series to each lamp.

Next, FIG. 4 shows still another embodiment, in which the current limited by the first current limiting impedance (3) in FIG.
) flows through (4b). In this way, different lamp electric currents 4a>41)>4c can be applied to each lamp.In addition, in this embodiment, while lamp (4a) is lit, lamps (4b) and (4c) are The light is off, but the rung (4b) or lamp (4C)
When (4a) is turned on, it is also possible for (4a) to turn off (9) to turn on, and this also depends on the settings of current limiting impedance (3) and impedances (10b), (10c), etc.

In addition to the embodiments described above, if the lamp requires preheating of the electrodes, the inverter may be provided with a preheating means, and the preheating may be performed as shown in FIG. Further, the first current-limiting impedance (3) may be substantially formed by configuring the output transformer of the impark (2) as a leakage transformer. The control device (8) can also be configured with a timer such as a monostable multi-pipe rake that lights each lamp for a desired period, a photocoupler, etc. that transmits a clock signal and a drive signal that controls the opening and closing of the transistors of each switch. The switch device may be constructed from components other than the full-wave rectifier circuit and transistors of the embodiment. Furthermore, although the description has been made for three lamps, it goes without saying that any number of lamps may be used as long as there are two or more lamps. Furthermore, one switch device may be able to light up a plurality of lamps; in short, any one of the plurality of switch devices may operate as if it were in a cut-off state.

As described above, according to the device of the present invention, by providing a plurality of switch devices, a single inverter can control turning on and off of a plurality of lamps, so the entire device can be made compact and inexpensive. It has the advantage of

[Brief explanation of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing an example of a control device that can be used for the device shown in FIG. 1, and FIGS. It is a figure showing an example of. In the figure (11 is a DC power supply, (2) is an inverter, (3) is a first current limiting impedance, (4a) to (4c) are lamps, (5a) to (5c) are switch devices, (10a)
~(10c) is the second current limiting impedance. The same reference numerals in the drawings indicate the same or corresponding parts. Figure 1 Figure 2 Figure 3 Figure 3

Claims (2)

[Claims] (1) A plurality of switch devices connected in series with the lamps are connected in parallel to the output side of an inverter that is connected to a DC power source and energizes a plurality of discharge lamps via a current limiting impedance. A discharge rung lighting device for multiple lights, characterized in that at least one of the lights is cut off. (2) The current limiting impedance is composed of a leakage transformer and an output transformer of an inverter, and the output current is set to the required current value of the lamp that requires the maximum current among the multiple lamps. The multiple discharge lamp lighting device according to item (1).