KR20000058217A - power supply circuit for a dimmer for instantly switching a plural fluorescent lamp - Google Patents

Abstract

PURPOSE: A power supply circuit of dimmer for momentary lighting of multiple fluorescent lamp is provided to the switch on-off operation for momentary lighting on each group of fluorescent lamps with a programed serial order for an advertising effect. CONSTITUTION: A power supply circuit of dimmer for momentary lighting of multiple fluorescent lamp comprising an AC power(10), a switch(12) and a preheat transformer(14) is connected and formed a closed loop the secondary side coils(L2, L3) against a primary side coil(L1) are constructed on the preheat transformer(14).fluorescent lamp(16) are designed between the secondary side coil(L2, L3), a node n1 is formed on between the switch(12) and the preheat transformer(14), a switching controller(18) having a micro processor is mounted on the node n1; the switching controller(18) has a multiple output terminal. a ballast(20) having coils(l4, l5) which contacted to the output terminal(A1) of the switching controller(18). The switching controller(18) includes a micro processor CPU(32), the AC voltage(Vin) applied on primary(L11) of the transformer, a square-wave generator(30) is connected on the secondary(L12) of the transformer, and shifted square-wave is applied on the CPU(32).

Description

Power supply circuit for a dimmer for instantly switching a plural fluorescent lamp

The present invention relates to a power supply circuit of a dimming device, and more particularly, a plurality of fluorescent lamps connected in parallel to each other to supply AC power for blinking according to a predetermined program and have a sufficient AC voltage level using a micro process. The present invention relates to a power supply circuit of a dimming device for instantaneous lighting of a plurality of fluorescent lamps that instantaneously turns on a plurality of fluorescent lamps.

In general, a neon tube or a fluorescent lamp may be used for dimming, and since the high pressure is used for lighting the neon tube and there is a problem of generating high heat, a fluorescent lamp is used when such a condition is unsuitable.

The large billboards of the dimming device may be configured to obtain a propaganda effect by using a fluorescent lamp, but there is a technical problem to turn on and blink a large number of fluorescent lamps at the same time.

When a large number of fluorescent lamps are configured in parallel and turned on and blinking, the load is excessive and sufficient voltage for instantaneous lighting is not supplied to each fluorescent lamp. Therefore, when a large number of fluorescent lamps are actually configured in parallel and then flickered, a plurality of fluorescent lamps This initial lighting fails and does not flash.

In general, fluorescent lamps require high voltage at initial lighting, and as a specific example, instantaneous high voltage is required for initial lighting of about 1500V or more based on a 400W fluorescent lamp. However, if the load increases due to a large number of fluorescent lamps as described above, the above-mentioned initial lighting conditions of the fluorescent lamps are not entirely satisfied, and some fluorescent lamps in which the initial lighting conditions are not satisfied are difficult to turn on instantaneously. It does not light up.

For the reasons described above, no fluorescent lamps have been used when producing large billboards.

An object of the present invention is to control the time when the initial voltage is applied to the entire fluorescent lamp from the ballast in the flashing by selectively supplying AC power to a plurality of fluorescent lamp groups at the same time, and the selected groups are instantaneously lit and the groups are Thus it is in flashing.

Another object of the present invention is to group a plurality of fluorescent lamps to form a large billboard to be flickered according to a predetermined program, and to supply a sufficient voltage for instantaneous lighting to these fluorescent lamps to enable a blinking operation to obtain an advertising effect.

1 is a circuit diagram showing a preferred embodiment of a power supply circuit of a dimming device for instant lighting of a plurality of fluorescent lamps according to the present invention;

2 is a detailed circuit diagram of a switching controller configured in an embodiment.

3 is a waveform diagram according to the operation of the embodiment

The power supply circuit of a light control apparatus using a fluorescent lamp according to the present invention includes a plurality of fluorescent lamps connected in parallel, and ballasts for supplying alternating voltages to the fluorescent lamps are individually configured in series, and are supplied from the power supply to each ballast. A commercial AC voltage is selectively applied by a switch, and a switching controller having a plurality of output stages is provided between the switch and the ballast.

The switching controller may include a transformer to which the AC voltage is induced, a square wave generator for outputting a square wave having a predetermined time width when the output voltage of the transformer is applied and the level of the AC voltage is above a specific level, and the AC voltage is applied. The at least two switching means and the square wave which are selectively outputted, and the square wave is input, and when a lighting start command is generated for any group included in the plurality of fluorescent lamps according to a predetermined program, the arbitrary square group is input at the time when the next square wave is input. And a central processing unit for outputting a switching signal to a switching element for selectively outputting the alternating voltage and supplying the alternating voltage to specified fluorescent lamps in an arbitrary group.

In addition, the switching element is composed of a triac and the switching element is preferably applied to the gate of each triac.

The square wave generator preferably outputs the square wave when the level of the AC voltage reaches 70 to 95 percent of the maximum value.

In addition, the CPU may output a switching signal for turning on the switching element at the rising time of the square wave as a micro process.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is implemented in a dimmer in which a plurality of fluorescent lamps are configured in parallel, such as a large billboard, and these fluorescent lamps blink at the same time, and switching for blinking and instantaneous lighting is determined by a switching controller incorporating a microprocessor.

The microprocessor configured in the embodiment includes a predetermined program for blinking, and a switching timing adjustment function for simultaneous instantaneous lighting. The control switch is operated by the control of the microprocessor incorporating the above-described function, so that preprogrammed blinking and instantaneous lighting are performed.

This will be described with reference to FIGS. 1 and 2, and the switching controller configured in the embodiment according to the present invention has a plurality of output stages, and a plurality of ballasts and a plurality of fluorescent lamps for blinking are grouped at each output terminal of the switching controller. Connected in parallel, the number of output terminals of the switching controller may be set to correspond to the number of groups of fluorescent lamps flashing, and as described above, a plurality of ballasts and fluorescent lamps are grouped in parallel, respectively, and programmed flashing is performed. Is connected to.

However, in order to explain the operation of the embodiment in FIG. 1, one ballast and one fluorescent lamp are illustrated at the output terminal of the switching controller, and in actuality, the ballast and the fluorescent lamp of the same configuration are arranged in parallel at the same output terminal according to the manufacturer's intention. These fluorescent lamps flash at the same time and light at the same time.

Referring to FIG. 1, in the embodiment of the present invention, the power supply 10 and the switch 12 and the preheating transformer 14 for supplying an AC voltage having a commercial frequency of 60 Hz are connected to form a closed loop.

In the preheating transformer 14, secondary coils L2 and L3 are configured with respect to one primary coil L1. The fluorescent lamp 16 is configured between the secondary coils L2 and L3.

A node n1 for branching is formed between the switch 12 and the preheating transporter 14, and a switching controller 18 incorporating a microprocessor is configured in the node n1, and the switching controller 18 includes a plurality of output stages. Has

In the embodiment, the ballast 20 is configured, and the coils L4 and L5 having one coil divided into a predetermined length ratio are configured inside the ballast 20, and the splitting point between the coils L4 and L5 is the switching controller 18. Is connected to one of the output stages, i.e., output stage A. At this time, preferably L4: L5 is configured to have a length ratio of about 10: 1.

The coil L5 is connected to a node n2 formed between the power supply 10 and the preheating transformer 14, and the coil L4 is connected to a node n3 in which the secondary coil L2 of the preheating transformer 14 is formed between the fluorescent lamps 16. Connected. The node n4 and the node n2, which are formed between the fluorescent lamp 16 and the secondary coil L3 of the preheating transformer 14, are connected to form a loop through which current flows.

As described above, when the switch 12 is turned on, supply of AC power is started to supply current to the primary coil L1 of the preheating transformer 14, and accordingly, current is induced to the secondary coils L2 and L3 to provide a fluorescent lamp. Both terminals of (16) are preheated. This preheating is for smooth lighting of the fluorescent lamp 16.

On the other hand, when the AC voltage Vin is inputted to the switching controller 18 connected to the node n1, the switching controller 18 starts operation and selectively applies the AC voltage Vin switched between the output terminal A and the output terminal B to the ballast 20.

Then, the ballast 20 accumulates in the capacitor C when the current flows in the reverse direction (toward the switching controller 18) and the voltage stored in the capacitor C when the current flows in the forward direction (to the fluorescent lamp 16 side). For instantaneous lighting, it is supplied to the fluorescent lamp 16 in addition to the AC voltage Vin, whereby the fluorescent lamp 16 is instantaneously lit by the initial high pressure.

The instantaneous high-pressure application of this ballast 20 is made only during the initial lighting of the fluorescent lamp 16 and thereafter, Vin is continuously supplied until it is turned off. The closed loop through which current flows in the state where the fluorescent lamp 16 is turned on is formed including the power supply 10, the switch 12, the switching controller 18, the ballast 20, and the fluorescent lamp 16.

The lighting of the fluorescent lamp 16 as described above is commonly applied to the respective fluorescent lamps connected in parallel to the output terminal A of the switching controller 18 as described in the configuration of the embodiment. The instantaneous lighting and flashing operation are simultaneously performed by the action of the switching controller 18, and the switching controller 18 simultaneously turns the AC voltage Vin toward the fluorescent lights when the AC voltage Vin is in sufficient voltage to light up a plurality of fluorescent lights. Supply. Accordingly, a plurality of parallel connections are supplied and supplied at a sufficient level of the initial foal ratio in a state where the load is large so that instantaneous lighting of these fluorescent lamps is achieved.

A detailed configuration and instant lighting operation of the switching controller 18 will be described in detail with reference to FIG. 2.

The switching controller 18 includes a central processing unit 32 which is a micro process, and is configured such that an alternating voltage Vin is applied to the primary side L11 of the transformer, and an alternating voltage generated by an induced current is applied to the secondary side L12 of the transformer. The square wave generator 30 is connected to be possible. The square wave generator 30 is configured to convert an AC voltage into a square wave to be applied to the central processing unit 32. The central processing unit 32 has gates of the triacs 34 and 36 that switch signals Sa and Sb respectively different. It is configured to apply to the side. The triacs 34 and 36 are configured such that an alternating voltage Vin is applied via the node n11 and the node n12, respectively. Each output side of the triacs 34 and 36 is composed of output terminals A and B, respectively.

As shown in FIG. 2, when the AC voltage Vin is applied, the switching controller 18 receives an AC voltage induced by a transformer consisting of coils L1 and L2 to the square wave generator 30.

When the Vin is input as shown in FIG. 3, the square wave generator 30 generates a square wave Pin having a pulse width of a time T having a potential higher than or equal to a specific level in an AC voltage having a sinusoidal waveform at a predetermined frequency having a positive value. .

The above-mentioned square wave pin is for supplying a voltage for the instantaneous lighting to the fluorescent lamp 16 when the AC voltage Vin having a sinusoidal waveform in the central processing unit 30 has a potential enough to initially drive the fluorescent lamp 16. In the end, the square wave Pin is used to set a time point for the momentary lighting of the fluorescent lamps 16, that is, a time point for applying an initial high voltage obtained by combining the voltages stored in Vin and the capacitor C.

In detail, the AC voltage Vin is supplied with a predetermined frequency as a sine wave. For instant lighting of fluorescent lamps, AC voltage Vin must be above a certain level. Therefore, when switching is made in a section in which the AC voltage reaches a level of about 70 percent or more of the maximum voltage among the sections in which the AC voltage is maintained in a positive state, the fluorescent lamps are instantaneously lit. This is possible.

This section is the pulse width of the square wave Pin. If voltage is applied to each of the fluorescent lamps connected to the switching controller 18 in a section beyond the pulse width of the square wave pin, partial lighting failure occurs due to an insufficient voltage level.

On the other hand, the microprocessor central processing unit 32 is programmed such that the plurality of fluorescent lamps as described above are classified into several groups and blink these groups at different times, and accordingly, a flashing command for the groups in which the on or off is selected is selected. Is generated.

In the embodiment according to the present invention, when a lighting command for the group of fluorescent lights connected to the output terminal A is generated at the 'P' position as shown in FIG. 3, the central processing unit 32 switches the switching signal until the square wave is input from the square wave generator. When Sa is kept at a low level and a square wave is input from the square wave generator 30, the CPU 32 outputs the switching signal Sa at a high level in accordance with the rising time of the square wave.

Then, the triac 34 is turned on and outputs an alternating voltage Vin. At this time, the voltage stored in the capacitor C is applied to Vin so that the instantaneous high voltage for instantaneous lighting is simultaneously applied to the fluorescent lamps 16 connected to the switching controller 18. Is approved.

In addition, instantaneous lighting of the group of fluorescent lamps connected to the output terminal B is also performed in the same manner as in the case of switching Vin to the output terminal A described above.

The extinguishing is performed at the time when the extinguishing command is generated in the central processing unit 32, and the level of the switching signals Sa and Sb drops to low.

According to the present invention, instantaneous lighting of a specific group of fluorescent lamps connected in parallel can be made possible by adjusting the timing at which the AC voltage Vin is applied to the fluorescent lamp, and at the flashing timing programmed in the central processing unit 32 which is a micro process. Therefore, the fluorescent lamps cross each group and blink.

Therefore, according to the present invention, it is possible to configure a large billboard using a plurality of fluorescent lamps, and divide the fluorescent lamps installed in the large billboard into a group consisting of a predetermined number of fluorescent lamps and these groups flash at different times according to a predetermined program. Can be.

As described in detail above, the present invention has been described in detail with respect to preferred embodiments, but those skilled in the art to which the present invention belongs, various modifications of the present invention without departing from the spirit and scope of the present invention It will be appreciated that the modifications may be made.

As described above, according to the embodiment of the present invention, it is possible to manufacture a large billboard using a plurality of fluorescent lamps. In this case, the plurality of fluorescent lamps are instantaneously lit at the same time and sequentially flashed in groups according to the programmed order. Therefore, by supplying a sufficient instantaneous lighting voltage to a plurality of fluorescent lamps at the same time, the partial unlit is solved, thereby eliminating the flashing of the missing state, thereby improving the reliability of the light control apparatus.

Claims (4)

A plurality of fluorescent lamps having a plurality of fluorescent lamps connected in parallel, the ballasts for supplying an alternating voltage to the fluorescent lamps are individually configured in series, and a plurality of fluorescent lamps for which commercial AC voltage supplied from a power source to each ballast is selectively applied simultaneously by a switch In the power supply circuit of the dimming device for the instantaneous lighting of A switching controller is provided between the switch and the ballast and has a plurality of output stages; The switching controller, A transformer in which the AC voltage is induced; A square wave generator for outputting a square wave having a predetermined time width when the output voltage of the transformer is applied and the level of the AC voltage is higher than or equal to a specific level; At least two switching elements selectively outputted by applying the AC voltage; And A switching element for selectively outputting the alternating voltage to the arbitrary group at the time when the next square wave is inputted when the command to start lighting for any group included in the plurality of fluorescent lamps is input according to a predetermined program And a central processing unit for outputting a switching signal to and supplying the alternating current voltage to the fluorescent lamps specified in any group at the same time. The method of claim 1, And the switching element comprises a triac and the switching signal is applied to a gate of each triac. The method of claim 1, And the square wave generator outputs the square wave when the level of the AC voltage reaches 70 to 95 percent of the maximum value. The method of claim 1, And the central processing unit outputs a switching signal for turning on the corresponding switching element at a rising time of the square wave as a micro process.