JPH09161980A - Power supply unit for sign lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply unit for sign lamp capable of coping with various requirements by providing two secondary windings on a transformer boosting the high-frequency AC voltage from an inverter, and connecting output terminals at both end of the secondary windings respectively. SOLUTION: The commercial power from a commercial power source 1 is inputted to an inverter 14 through a rectifying circuit 13 and converted into the AC power having the frequency higher than the commercial frequency, and it is boosted by a leak transformer 15. Two secondary windings 25a, 25b are provided on the transformer 15, and they are connected to output terminals 16a-16d respectively. Two secondary windings 25a, 25b are provided on the transformer 15, and they are connected to output terminals 16a-16d respectively. The lighting power with the high-frequency voltage is fed to multiple sign lamps 17 connected in series from the output terminals 16a.... This power supply unit for sign lamp can change the connection of the output terminals 16a... and cope with various requirements, e.g. the driving voltage is increased by the addition output (B) connecting the terminals of different polarities, or it can be connected to many sign lamps by the subtraction output (C) connecting the terminals of the same polarity, or high luminance is obtained by the parallel connection output (D).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device for a sign light for boosting an AC voltage from an inverter with a transformer and applying it to a sign light such as a neon tube or an argon tube to light it.

[0002]

2. Description of the Related Art Conventionally, a power supply device which boosts commercial power with a neon transformer and applies the boosted power to a sign light has been mainly used. On the other hand, recently, from the viewpoint of small size and light weight, a power supply device has been widely used, which uses an inverter to boost electric power having a frequency higher than commercial power with a transformer and apply the electric power to a sign light.

As shown in FIG. 8A, in this inverter type power supply device for sine light, commercial power from a commercial power source 11 is input to a rectifier circuit 13 from input terminals 12a and 12b, and the rectified output is fed to an inverter 14 for commercial AC. A frequency higher than the frequency of electric power, for example, converted into AC power of about 20 KHz, the AC output of the inverter 14 is stepped up by the leakage transformer 15, output between the output terminals 16a and 16b, and connected between the output terminals 16a and 16b. Sign Light 1
7 and the sign lamp 17 is turned on.

In this inverter system, since the frequency of the AC power boosted by the transformer 15 is high, the transformer 15 can be made extremely small and lightweight. However, as shown in FIG. 9A, the sign lamp 17 is normally mounted on a support panel plate 18 made of iron through a sign lamp holder 19, and
The distribution line 21 for is supported by the insulator 22 mounted on the support panel plate 18. The support panel plate 18 is grounded, and between the distribution line 21, the sign light 17 and the support panel plate 18, between the sign light 17 and the distribution line 21, between the sign light and the sign light 17, and between the distribution line 21 and the distribution line. Each stray capacitance 23 in between cannot be ignored with respect to the frequency of the inverter output AC power, and for example, as shown in FIG. 9B, a plurality of sign lights 17 connected between output terminals 16a and 16b.
AC current reaching the central portion of the sign leaks considerably due to the floating electrostatic capacitance 23, and the brightness of the sign lamp 17 decreases and the brightness unevenness increases as the distance from the output terminals 16a and 16b increases. The sign light 17 of some parts may not be turned on. Also, in the case of a complicated sign lamp display device, in particular, sign lamps connected to different sign lamp transformers may be arranged close to each other due to the influence of the capacitance between adjacent sign lamps. Interference may occur between these sign lights, such that the extinguishing sign lights are turned on under the influence of the adjacent lighting sign lights. Particularly in a neon signboard used outdoors, when the distribution line 21 is run around for a long time or in rainy weather, the neon tube in the central part is turned off and interference between neon tubes occurs.

Therefore, by making the length of the distribution line 21 as short as possible, it is possible to light 4 neon tubes (total tube length 6 m) and 6 argon tubes (total tube length 9 m) at 9 kV commercial frequency lighting. It was only obtained.

[0006]

When commercial power is directly boosted by a transformer, the voltage is boosted to 15 kV, and 8 neon tubes (12 m in total length) and 12 argon tubes (1 total tube length in total) are used.
8 m) is often used, but in the inverter system, the load wiring was made as short as possible, and only 9 kV of commercial power direct boosting could be finally turned on.

In order to solve this problem, conventionally,
It has been proposed that (1) the distance between wirings and the distance between the sign light and the support panel plate be widened, and (2) the AC power frequency be lowered. However, in the method (1), it is necessary to greatly increase the interval, and the demand for miniaturization, complexity, and high density display is increasing, which is contrary to this.
Since it is not possible to use the sign light support and the insulator that were used for commercial frequency lighting, making the space between the sign light and the support panel board large occupies a large space, makes the construction difficult, and it looks not good. Method (2) is, for example, 20k
If it is set to half of Hz, that is, about 10 kHz, it becomes an audible frequency band, a problem of noise source occurs, and a transformer becomes large.

In order to facilitate the ground insulation of the secondary winding of the transformer, in a foreign country, the transformer 15 is provided with two secondary windings 25a and 25b as shown in FIG. 8B. It is practiced to connect one end of each of the secondary windings 25a and 25b, ground the connection point 26, and connect the other end of each of the secondary windings 25a and 25b to the output terminals 16a and 16b.
In this case as well, the voltage between the output terminals 16a and 16b and the grounded connection point 26 is E _0/2, but this is added at the connection point 26, that is, the terminal 16
The distance between a and 16b is E _0. Looking at the influence of the stray capacitance, the secondary windings 25a and 25b in the actual lighting state are shown.
8A, 8B and 8C show the absolute value of the potential with respect to the ground.
As shown in, the middle point or the connection point 26 has a zero potential, and positive and negative E _0/2 , that is, the same level in absolute value, and the maximum value thereof is E _0/2 . Moreover, the secondary winding 25
Since the connection point 26 of a and 25b is completely grounded, the impedance between the secondary windings 25a and 25b and the magnetic core of the transformer 15 becomes zero, and the leakage current tends to increase further through this.

From such a point, Japanese Patent Application No. 7-292751
No. "Power supply for sign light" proposed a power supply as shown in FIG. 10A. In FIG. 10A, the parts corresponding to those in FIG. 8A are denoted by the same reference numerals, but in this case, the transformer 15
Are provided with two secondary windings 25a and 25b, and the same polarity ends of these secondary windings 25a and 25b are connected to each other, and the connection point 31 is connected to a common terminal 32.
The other ends of a and 25b are connected to the output terminals 16a and 16b. The sign lamp 17 is connected between each of the common terminal 32 and the output terminals 16a and 16b.

According to this structure, the output terminals 16a, 16b
The voltage between each of the common terminal 32 are both E _0/2, and the
Since the potentials of the output terminals 16a and 16b are opposite in polarity to each other, the voltage between the terminals 16a and 16b becomes 0, and the secondary windings 25a and 25b generate a ground potential in the opposite direction with their respective midpoints as zero potential. , the absolute value of this for the ground potential is maximum as shown in FIG. 10B, a half of that of the case of FIG. 8C, i.e. becomes E _0/4, the magnitude of the stray capacitance 23 is a same as the conventional However, the leakage current is half that of the conventional one. Therefore, many sign lights can be connected, and a conventional 15 KV commercial frequency lighting power supply device can be obtained. However, the number of output lines is increased by one.

For example, in the case of a neon signboard, it is not always necessary to connect many sign lights between one transformer in view of its display shape and size, and therefore the wiring length including the sign lights does not become so long. There is. Also, there is no danger of rain with sign lights such as channel letters,
Moreover, the unevenness of brightness is not noticeable because there is a diffusion panel behind it.

There is also a demand for a sign lamp power supply device which can obtain a high brightness by flowing a larger secondary current. As described above, there are various demands for the power supply device for the sign light, and conventionally, different power supply devices for the sign light are used according to the respective demands. An object of the present invention is to provide a power supply device for a sign light which can be used for various requirements.

[0013]

According to the invention of claim 1, the transformer to which an AC voltage higher than the commercial frequency is applied has 2
Two secondary windings are provided, and output terminals are connected to both ends of these secondary windings, respectively. According to the invention of claim 2, two transformers to which an alternating voltage higher than the commercial frequency is applied are provided, and both ends of each secondary winding of these transformers are connected to the output terminal.

In any one of the first and second aspects of the invention, the output voltage of the two secondary windings can be added, subtracted, or connected in parallel depending on how the four output terminals are connected. . In the invention of claim 3, two transformers to which an AC voltage higher than the commercial frequency is applied are provided, and one ends of both secondary windings thereof are connected to each other, and a connection point between them.
The other ends are connected to the output terminals, respectively, and the primary windings of both transformers are connected in parallel so that the connection polarity can be switched by the polarity switch.

The output voltage of the two secondary windings can be output as an addition output, a subtraction output, or a parallel connection output by changing the polarity changeover switch and connecting the three output terminals.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1A shows an embodiment of the invention of claim 1 and the same reference numerals are given to the portions corresponding to those of FIGS. 6A and 10A. In this embodiment, the transformer 15 is provided with two secondary windings 25a and 25b having the same number of turns.
Both ends of 5a and 25b are output terminals 16a, 16b and 16
c and 16d, respectively.

With such a structure, as shown in FIG. 1B, the output terminals 16b and 16c to which one ends of the secondary windings 25a and 25b having different polarities are connected are connected, and the other ends thereof are connected. Sign light 1 between output terminals 16a and 16d
Connecting 7, between the output terminals 16a, 16d, each secondary winding 25a, a voltage E ₀ to the output voltage E _0/2 is added and 25b is output. Therefore, a large drive voltage is required, the wiring is short, and it is suitable for use in locations where it is not exposed to rain. Secondary windings 25a, 25 in this case
The absolute value of the ground voltage of b is E as shown in FIG. 1E.
_0/2 become.

As shown in FIG. 1C, the secondary windings 25a, 25
output terminals 16b, 16 to which one ends of b having the same polarity are connected
d between the output terminals 16a and 16b and the output terminal 1
6b, respectively when connecting same sign lamp 17 between 16c, become power supply and the same state shown in FIG. 10A, the output terminal 16a, 16c between the secondary winding 25a, the output voltages of 25b E _0/2 There are subtracted from each other, 0V, and the secondary winding 25a, the absolute value of the ground potential of 25b is the maximum value as shown in FIG. 1F becomes E _0/4. Therefore, more sign lights can be connected than before, and the wiring becomes relatively long,
Suitable for applications where uneven brightness is disliked.

As shown in FIG. 1D, the secondary windings 25a, 25
Output terminals 16a and 16c, 16b and 16d, to which the same polarity ends of b are connected, are respectively connected, and a sign lamp 17 is connected between the output terminals 16a and 16b. The secondary winding 25a of the case, the absolute value of the ground potential of 25b becomes E _0/4 at the maximum, as shown in FIG. 1G. In this case, the output voltages of the secondary windings 25a and 25b are connected and output in parallel, the driving voltage is not so high, the number of connected sign lamps is halved, but the current is doubled and a large output current is required. Suitable for lighting high-intensity sign lights.

FIG. 2A shows an embodiment of the invention of claim 2,
The same reference numerals are given when corresponding to FIG. In this embodiment, two transformers 15a and 15b are provided as transformers to which the output of the inverter 14 is supplied.
Both ends of the secondary windings 25a, 25b of 5a, 15b are connected to output terminals 16a, 16b, 16c, 16d. According to this configuration, as shown in FIGS. 2B, C, D,
By connecting the output terminals 16a and 16d in the same manner as C and D, the output voltage of the secondary windings 25a and 25b, the addition output, the subtraction output, and the parallel connection output can be obtained.

FIG. 3A shows an embodiment of the invention of claim 3,
Parts corresponding to those in FIG. 2 are denoted by the same reference numerals. In this embodiment, two transformers 15a and 15b are provided as the transformers to which the output of the inverter 14 is supplied, and the connection polarity of the primary winding 38a of the transformer 15a and the primary winding 38b of the transformer 15b can be switched. The polarity changeover switch 39 connects in parallel. In this example, the movable contacts 39a and 39b of the changeover switch 39 are connected to both ends of the primary winding 38b, and the movable contact 39a is fixedly connected to be switched.
c and 39d are respectively connected to fixed contacts 39f and 39e whose movable contact 39b is switched and connected, and movable contact 39a.
Is connected to the fixed contact 39c, the movable contact 39b
Are linked so as to be connected to the fixed contacts 39e, and the connection points of the fixed contacts 39c and 39f and the fixed contacts 39d and 39f.
The connection point of e is connected to both ends of the primary winding 38a and to both output ends of the inverter 14.

One ends of the secondary windings 25a and 25b having different output polarities are connected to each other, and the connection point is the output terminal 16
The other ends of the secondary windings 25a and 25b are connected to the output terminals 16a and 16c, respectively. In this configuration, as shown in FIG. 3B, the movable contacts 39a and 39b of the changeover switch 39 are connected to the fixed contacts 39c and 39e, respectively, and the sign lamp 17 is provided between the output terminals 16a and 16b.
, The secondary winding 2 is connected to the output terminals 16a and 16c.
The outputs of 5a and 25b are added and output.

As shown in FIG. 3C, the changeover switch 39
Of the movable contacts 39a, 39b of the fixed contacts 39d,
If the sine lamps 17 of the same number are connected between the output terminals 16a and 16b and between the output terminals 16a and 16b and the output terminals 16b and 16c, respectively.
The output voltage of 25b is subtractively added and output. As shown in FIG. 3D, the changeover switch 39 is brought into the connection state shown in FIG. 3C, the output terminals 16a and 16c are connected, and the output terminal 16a is connected.
When the sign lamp 17 is connected between the output terminal 16b and the output terminal 16b,
Both outputs of the secondary windings 25a and 25b are parallel connection outputs.

Rectifier circuit 13 and inverter 14 in FIG. 1A.
FIG. 4 shows an example in which That is, the rectifier circuit 13 is a full-wave rectifier circuit, and the inverter 14 has the capacitors 34 and 35 connected in series between the output terminals of the rectifier circuit 14 and the switching elements 36 and 37 connected in series.
Switching element 3 and connection point of capacitors 34 and 35
The primary winding 38 of the transformer 15 is connected to the connection point of the switching elements 36, 37, and the switching element 36,
37 is alternately turned on and off. That is, the inverter 14 is configured as a so-called half bridge circuit.

Further, in this example, an independent leakage magnetic circuit is formed for each of the secondary windings 25a and 25b. For example, FIG. 5A
As shown in, one long side 41a of the square-shaped magnetic core 41
A primary winding 38 is provided at the center of the upper part and secondary windings 25 are provided on both sides of the primary winding 38.
a and 25b are wound respectively, and the leakage cores 42a and 42b are projected from the other long side 41b so as to approach the long side 41a between the primary winding 38 and the secondary windings 25a and 25b, respectively. There is. In this way, the secondary windings 25a, 2
Independent leakage magnetic circuits 43a and 43b are formed for each 5b.

When the leakage magnetic circuits of the secondary windings 25a and 25b are the same, the number of the sign lights 17 connected to the terminals 32 and the terminals 16a and 16b is the same, that is, the load circuits are the same. However, due to the stray capacitance of these load circuits and the variation in the discharge start voltage of the sine lamp, only one side is discharged first, and due to the current limiting drooping characteristics of the leakage transformer, the discharged load circuit If the voltage between the terminals drops, the other side will be below the discharge start voltage and will not light up,
It will be lit on one side.

However, as shown in FIG. 5A, the secondary winding 25
Since the leakage magnetic circuits 43a and 43b are independently provided to a and 25b, even if the sign light on one side is discharged first,
Only the output characteristic of the secondary winding on the lit side is in the current limiting drooping state, the output voltage of the other secondary winding is not affected, and the sign lamp is also lit on the other side with a delay. FIG. 5B shows a structure in which the magnetic core of the transformer 15 is an outer iron type. Further, when the two transformers 15a and 15b are provided as shown in FIGS. 2A and 3A, the outer shape of the transformer is an outer iron type. An example is shown in FIG. 5C.

When the two transformers 15a and 15b are provided as shown in FIGS. 2A and 3A, the two inverters 14a and 14b are used as shown in FIG. , 14b may be supplied to the transformers 15a, 15b, respectively. FIG. 6B shows a case where the number of rectifier circuits is also 13a and 13b. The power supply device of the present invention is not limited to the case of receiving commercial AC power, but may be configured to receive DC power and supply it to the inverter. Depending on the case, the output of the inverter may be received. That is, the inverter may be provided outside and may be remote from each other, and one inverter may drive the plurality of transformers 15 or 15a, 15b. Further, the inverter is not limited to the separately excited type and may be a self excited type. A specific example thereof is shown in FIG. 7 by attaching the same reference numerals to the portions corresponding to those in FIG. A capacitor 51 is connected between both ends of the primary winding 38, both ends of the primary winding 38 are connected to one end on the output side of the rectifier circuit 13 through switching elements 36 and 37, and a middle point of the primary winding 38 is a choke 52.
Is connected to the other end on the output side of the rectifier circuit 13, and the both ends of the tertiary winding of the transformer 15, that is, the oscillation (feedback) winding 53 is connected to the control electrodes of the switching elements 36 and 37, and the output side of the rectifier circuit 13 is connected. A bias circuit 54 is connected between both ends of the
A bias is applied to each of the control electrodes of 7 to form an oscillation circuit, and its oscillation output, that is, AC power of a frequency higher than the commercial frequency from the inverter is boosted by the transformer 15 and its secondary winding 25a, High voltage AC output is obtained from 25b.

[0029]

As described above, according to the first and second aspects of the present invention, the AC power having a frequency higher than the commercial frequency is supplied to the transformer, and the transformer can be made compact and lightweight, and the output terminal Depending on the connection selection, the secondary winding output can be selected from addition output, subtraction output, and parallel connection output, and the output required depending on the size and shape of the sign light device, the state of the construction site, etc. can do. In the case of addition output or parallel connection output, only two wires are required and construction work is easy. In the case of subtraction output, there are three wires, but there is little uneven brightness, and the number of connected sign lights can be increased.
Sign lights can be placed close together. A parallel output provides a large output current and can be used for sign display with high brightness.

In the invention of claim 3, the number of output terminals is three, and by providing a polarity changeover switch on the primary side,
The same effects as those of the first and second aspects of the present invention can be obtained, and addition output and subtraction output can be performed by switching at a low voltage portion. According to the present invention, it is not necessary to prepare a power supply device for each request of the sign light device.

[Brief description of the drawings]

FIG. 1A is a diagram showing an embodiment of the invention of claim 1, B to C are diagrams showing various usage states thereof, and E to G are usage states B.
It is a figure which shows the earth potential (absolute value) distribution of the secondary winding in C to C.

2A is a diagram showing an embodiment of the invention of claim 2, and FIGS. 2B to 2C are diagrams showing various usage states thereof.

FIG. 3A is a diagram showing an embodiment of the invention of claim 3, and B to C are diagrams showing various usage states thereof.

FIG. 4 is a diagram showing an example in which a specific example of a separately excited inverter is applied to the invention of claim 1;

5A and 5B are diagrams showing a structural example of the transformer 15 in FIG. 1A, and C is a diagram showing a structural example of the transformers 15a and 15b in FIGS. 2A and 3A.

FIG. 6 is a diagram showing an example which is applied to the inventions of claims 2 and 3 and in which an inverter is provided for each transformer.

FIG. 7 is a diagram showing an example in which a specific example of a self-excited inverter is applied to the invention of claim 1.

FIG. 8 is a diagram showing a conventional inverter type two-wire output power supply device, B is a diagram showing a conventional inverter type three-wire output power supply device, and C is a ground potential distribution of the secondary winding of the device of B. It is a figure.

9A is a diagram showing an example of a relationship between a sign light and a distribution line supported by a support panel plate, and FIG. 9B is a view showing a brightness state of a sign light piped.

FIG. 10A is a diagram showing a power supply device for a sign lamp proposed previously, and B is a ground potential (absolute value) distribution diagram of its secondary winding.

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[Procedure amendment]

[Submission date] March 4, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

2A is a diagram showing an embodiment of the invention of claim 2, and FIG.
D is a figure which shows the various usage states.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3A is a diagram showing an embodiment of the invention of claim 3, and FIGS.
D is a figure which shows the various usage states.

Claims (3)

[Claims] 1. A power supply device for a sine lamp, wherein an AC voltage having a frequency higher than a commercial frequency from an inverter is boosted by a transformer and applied to a sine lamp, wherein the transformer is provided with two secondary windings. Output terminals are respectively connected to both ends of these two secondary windings, and the four output terminals are connectable so that both output voltages of the secondary windings are added, subtracted, and connected in parallel. A power supply device for a sign light. 2. A sine lamp power supply device for boosting an AC voltage of a frequency higher than a commercial frequency from an inverter and applying the voltage to a sine lamp by a transformer, wherein two transformers are provided. Output terminals are respectively connected to both ends of each secondary winding, and the four output terminals are connectable so that both output voltages of the secondary winding are output for addition, subtraction and parallel connection. A power supply device for a sign light, which is characterized in that 3. A power supply device for a sine light, which boosts an AC voltage of a frequency higher than a commercial frequency from an inverter with a transformer and applies the same to a sine light, wherein two transformers are provided, and both primary transformers of these transformers are provided. The windings are connected in parallel to each other so that the polarity of the connection can be switched by a polarity changeover switch, one ends of the secondary windings of the two transformers are connected to each other, and the connection point and the both secondary windings are connected. An output terminal is connected to each of the other ends of the wires, and the output voltage of both the secondary windings is added and output by switching the polarity switch and connecting the three output terminals,
A power supply device for a sign light, which is capable of subtraction output and parallel connection output.