JP4176137B1 - Constant current generator system for electroluminescent light source - Google Patents

Abstract

[PROBLEMS] To improve the accuracy of brightness adjustment with a simple circuit configuration with respect to a load circuit, to make it possible to arbitrarily control blinking of each load circuit connected in series, and to reduce the maintenance burden. A constant current generator system for an electroluminescent light source that can be reduced is provided.
A plurality of input sides that linearly change the amplitude of an AC constant current generated in a secondary winding of an output transformer, in which a commercial AC power supply, a capacitor, and an output transformer primary winding are connected in series. The switching tap includes a constant current generator 100 provided in the primary winding of the output transformer, and a load circuit including an electroluminescent light source, and a plurality of load circuits 300 to 700 are connected to the constant current generator 100 in series. Each of the load circuits 300 to 700 has the switches 302 to 702 that disconnect the load circuit from the series circuit and the circuit contacts 301 to 701 that short-circuit the load circuit, thereby solving the above-described problem.
[Selection] Figure 4

Description

  The present invention relates to a power source for an electroluminescent light source such as an LED (Light Emitting Diode) or an HID lamp (High Intensity Discharge Lamp). The present invention relates to a power supply system for an electroluminescent light source for lighting a lighting facility.

  In general, in an airfield, various airfield lights are arranged in order to operate an aircraft safely even when visibility is poor due to bad weather or at night. These airfield lights include landing lights that indicate the final approach path, runway lights that indicate the outline of the runway, taxiway lights that indicate the edges of the taxiway and apron (the area where the airplane is parked), etc. Can be mentioned.

  In such airfields and public facilities such as highways, tunnels, and parks, a large number of lamps equipped with thermoluminescent light sources such as tungsten lamps and halogen lamps are installed over a wide area. In order to supply electric power, wiring over a very long distance is required. For this reason, it is necessary to keep the light intensity of each lamp uniform in consideration of the power loss due to this wiring, and a lighting system that stably lights other lights even if any one of the lamps does not light is required. is there.

  Further, in the above-described lighting system, the visibility of the lamp changes depending on whether it is daytime or nighttime, and the weather condition, so it is necessary to adjust the luminance of the lamp according to the change of these conditions. For example, in the daytime when the ambient illuminance is high, that is, when the surroundings are bright, the visibility of the lamp is reduced, so that it is necessary to increase the brightness of the lamp. On the other hand, since the visibility of the lamp is good at night when the ambient illuminance is low, that is, the surrounding is dark, power consumption can be reduced by reducing the brightness of the lamp.

  As a power supply device suitable for such applications, the present inventor has developed a constant current light intensity adjustment device 200 as shown in FIG. The constant current light intensity adjustment device 200 is connected in series to the commercial AC power supply 210 and the commercial AC power supply 210, has an output of the commercial AC power supply 210 and a time constant that satisfies a predetermined resonance condition, and is independent of load fluctuations. It has a resonance circuit 220 that outputs a constant sine wave alternating current I, and an output transformer 230 in which a primary winding 230P is connected in series to the output of the resonance circuit 220.

  Further, a plurality of lamps 240 connected in series to the secondary winding 230S of the output transformer 230 via a relatively long distance wiring 280, and a sine wave alternating current flowing in the primary winding 230P only for an arbitrary period. On the basis of one cycle of the sine wave alternating current I output from the resonance circuit 220 based on the secondary current of the shunt circuit 250 that is short-circuited and the secondary current of the output transformer 230 detected by the current detector 270, that is, the load current IL. It has a cycle control circuit 260 that adjusts the magnitude of the load current IL by performing short circuit control (cycle control) on the shunt circuit 250.

  In such a constant current light intensity adjustment device 200, a resonance circuit 220 is connected in series to the commercial AC power supply 210, and a time constant determined from the capacitor 220A and the reactor 220B so as to satisfy a predetermined resonance condition. By selecting the frequency, voltage, and current of the AC power supply output, a constant current I that is independent of load fluctuations can be obtained. This current I is supplied to the primary winding 230P of the output transformer 230, boosted, and equally supplied as a constant load current IL to each lamp 240 connected in series to the secondary winding 230S of the output transformer 230. Is done.

  As a result, even if the wiring 280 from the output transformer 230 to each lamp 240 is very long, an equal current is supplied to the thermoluminescent light source 240B of each lamp 240 via the insulating transformer 240A. Each thermoluminescent light source 240B can be lit at a uniform luminous intensity. Even if any of the thermoluminescent light sources 240B is not lit, the series circuit on the load side is not disconnected by the insulating transformer 240A, so that the other thermoluminescent light sources 240B are not affected. The shunt circuit 250 includes thyristors 250A and 250B connected in parallel so that the polarities are opposite to each other. During a short circuit operation, the thyristor 250A is turned on during a period in which the sine wave alternating current is on the plus side. The thyristor 250B is turned on during the minus period.

FIG. 6 is a signal waveform diagram showing signals of respective parts of the conventional constant current light intensity adjustment apparatus 200 shown in FIG. 5, and here, the current I output from the resonance circuit 220 is equivalent to eight periods (period T1). The case where one cycle (cycle T2) is short-circuited is shown as an example. The cycle control circuit 260 calculates a wave number ratio R = T2 / T1 for obtaining a desired load current IL based on the load current IL detected via the current detector 270. For example, in the case of the wave number ratio R = 1/8, as shown in FIG. 6, the current I is shunted so as to short-circuit one cycle (cycle T2) of 8 cycles (cycle T1) of the sine wave. The circuit 250 is controlled. As a result, the current supplied to the lamp 240 is reduced to 7/8. And the electric current supplied to the lamp | ramp 240 can be changed by changing the wave number ratio R (for example, refer patent document 1).
Japanese Patent No. 3364407

However, in the conventional constant current light intensity adjustment device 200 described above, the load current IL is adjusted by short-circuiting the current Ia flowing on the primary side of the output transformer 230 at a predetermined wave number ratio R. When the frequency of the commercial AC power supply 210 is 50 Hz, the step size of the load current IL is 2%, and there is a problem that current adjustment below that is impossible.
Further, in order to reduce the load current IL, the load current IL is short-circuited at a predetermined wave number ratio R, so that there is a problem that the lamp 240 flickers as the load current IL is reduced.
In addition, as shown in FIG. 5, the conventional constant current light intensity adjustment apparatus 200 requires the resonance circuit 220, the shunt circuit 250, the cycle control circuit 260, and the like, and the circuit configuration becomes complicated, and the resonance circuit 220 includes the resonance circuit 220. Since the large reactor 220B is required, there is a problem that the apparatus is enlarged.

  In addition, since the brightness gradually decreases as dust adheres to the lamp glove (the member that covers the light source), you must polish the glove or replace the light source even though the lamp life has not yet expired. There was a maintenance problem that it was not possible.

  On the other hand, in recent years, in a lighting system in which a large number of lamps are arranged over a wide range, in consideration of power consumption and maintainability, a lamp using a filament such as a tungsten lamp or a halogen lamp as described above, a so-called thermoluminescent light source. Rather, the introduction of a so-called electroluminescent light source that efficiently obtains the desired emission color and does not have a long-life filament such as LED or HID lamp without worrying about breakage of the bulb (filament breakage) is being considered. ing.

  However, in the conventionally used thermoluminescent light source such as a tungsten lamp or a halogen lamp, the luminance of the light source with respect to the load current has a current-luminance characteristic along a cubic curve as shown in FIGS. Therefore, for example, when the luminance is 100% when the load current is 6.6 A, the load current of 2.8 A is necessary even when the luminance is adjusted to 0.2%. As a result, it is not necessary to supply and adjust a minute load current amount, and the constant current light intensity adjusting device 200 as described above can sufficiently cope with it.

  On the other hand, when an electroluminescent light source such as an LED or an HID lamp is used as the light source, the luminance of the light source with respect to the load current is a current-luminance characteristic along a linear curve. As described above, when the luminance is 100% when the load current is 6.6 A, the necessary current becomes a small load current of about 0.01 A when the luminance is adjusted to 0.2%. Therefore, supply and adjustment of a minute load current amount are required. Therefore, the constant current light intensity adjusting device 200 as described above has a problem in that it cannot cope with a lighting system using an electroluminescent light source because it cannot accurately adjust a minute load current amount.

  Moreover, in a lighting system using an electroluminescent light source, when the luminance is lowered to 0.2%, the required current may be 0.2% when the luminance is 100%, whereas conventional thermoluminescence is used. In the lighting system using the light source, even when the luminance is lowered to 0.2%, a current of 40% or more when the luminance is 100% is required, and there is a problem that the energy efficiency is extremely low. .

  In addition, the conventional constant current light intensity adjustment device 200 as described above assumes only power supply to one load circuit in which each lamp 240 is connected in series via an isolation transformer 240A, and a plurality of lamps 240 are Since there is no provision for connecting load circuits in series and turning on / off any load circuit without affecting the lighting / extinguishing status of other load circuits, approach lights and taxiway lights used at airfields Etc. could not meet the advanced user needs to turn on and off individually according to the precise flight schedule.

Furthermore, in recent years when global warming has become a serious social problem, there is a high interest in developing a lighting system using an electroluminescent light source that contributes to CO ₂ emission reduction by energy saving.

  Therefore, the technical problem to be solved by the present invention, that is, the object of the present invention is simple with respect to a load circuit in which a plurality of lamps using so-called electroluminescent light sources such as LEDs and HID lamps are connected in series. In addition to improving the accuracy of brightness adjustment and preventing the flickering of the lamp when reducing the load current with a simple circuit configuration, it is possible to arbitrarily control the blinking of each load circuit connected in series, and to maintain the lamp An object of the present invention is to provide a constant current generator system for an electroluminescent light source capable of reducing a maintenance burden.

  First, in the invention according to claim 1, a commercial AC power source, a constant current supply capacitor, and a primary winding of an output transformer are connected in series and are generated in a secondary winding of the output transformer. A constant current generator in which a plurality of input side switching taps that linearly change the amplitude of the AC constant current to be provided are provided in the primary winding of the output transformer and a plurality of lamps equipped with an electroluminescent light source are connected in series A constant current generator system for an electroluminescent light source comprising a plurality of load circuits connected in series to a secondary winding of an output transformer of the constant current generator Each of the load circuits forms a circuit that disconnects the load circuit from the series circuit, a circuit contact that short-circuits the load circuit, and prevents the circuit contact from being opened when the switch is opened. With interlock control mechanism By is obtained by solving the above problems.

  In the present invention, the “electroluminescent light source” is a generic term for light sources that do not have filaments such as LEDs and HID lamps, and that the luminance of the light source relative to the load current has a current-luminance characteristic along a linear curve. However, it is particularly preferable to use an LED as the electroluminescent light source in terms of durability, impact resistance, life and the like. In the present invention, “commercial AC power source” means a power source having a voltage supplied from an electric power company of 100 V or 200 V and a frequency of 50 Hz (Eastern Japan) or 60 Hz (Western Japan). A low-frequency AC power supply of a degree or less can be used instead of a commercial AC power supply. Furthermore, in the present invention, the “constant current generator” does not change the voltage so that a predetermined constant current flows to the load unlike the conventional constant current power supply device, regardless of the load fluctuation, That is, the constant current generation principle is completely different from the conventional constant current power supply device in that a constant current can always be supplied even when the load is short-circuited.

  In addition to the configuration of the invention according to claim 1, the invention according to claim 2 includes a plurality of output side switchings for finely adjusting the amplitude of the AC constant current generated in the secondary winding of the output transformer. The tap is provided in the secondary winding of the output transformer, thereby further solving the above-mentioned problem.

  In addition to the configuration of the invention according to claim 1 or 2, the invention according to claim 3 further solves the above problem by the fact that the electroluminescent light source is an LED.

The constant current generator system for an electroluminescent light source according to the present invention includes a commercial AC power supply having an output voltage of V (volts), a constant current supply capacitor having a capacitance C, and a primary winding of an output transformer in series. A constant current connected to the primary winding of the output transformer, wherein a plurality of input side switching taps are connected and linearly change the amplitude of the AC constant current generated in the secondary winding of the output transformer. Since the electrostatic capacity C is fixed by a very simple configuration including a generator and a load circuit in which a plurality of lights including an electroluminescent light source are connected in series, the primary side winding of the output transformer Since a constant current I ₁ corresponding to the capacitance C flows through the line, the load connected in series with the secondary winding of the output transformer (such as the number of electroluminescent light sources to be lit and the length of the wiring) Even if it is increased or decreased) For example, even when the load is short-circuited, the power supply voltage is not affected, and a stable constant current supply can always be realized to the secondary side of the output transformer. As a result, the operating state of the constant current generator can be checked with the secondary side of the output transformer short-circuited. In addition, since multiple lights are connected in series with a single wire as in a single stroke, the amount of wiring can be greatly reduced compared to the case where power is supplied to each lamp with two wires, saving resources. To contribute.

Further, the product I ₁ · T ₁ (ampere turn) of the constant current I ₁ flowing through the primary side winding and the number of turns T ₁ up to the selected input side switching tap is an alternating current generated in the secondary side winding. The product I ₂ · T ₂ (ampere turn) of the constant current I ₂ and the number of turns T ₂ of the secondary winding is constant, that is, the relationship of I ₁ · T ₁ = I ₂ · T ₂ is established, and I ₁ is As described above, when T ₂ is constant and T ₂ is fixed, an AC constant current I ₂ proportional to the number of turns T ₁ to each input side switching tap is generated in the secondary winding of the output transformer. The load current supplied to the light-emitting light source can be accurately adjusted by switching the input side switching tap from 100% energization to a very small energization of 0.2%, for example.

Moreover, if the adjustment is to be achieved by varying the magnitude of the amplitude of the alternating constant current I ₂ is a sine wave generated in the secondary winding of the output transformer, which went to reduce the load current However, good visibility can be exhibited without flickering the lamp. Furthermore, unlike the voltage-type tap switching, the current-type tap switching does not generate a potential difference between the taps, so that breakdowns such as dielectric breakdown are suppressed, and the safety of the device is improved.

  In addition, special effects corresponding to the configurations specific to the following claims can be obtained.

  That is, according to the constant current generator system for an electroluminescent light source according to claim 1, a plurality of load circuits are connected in series to the secondary winding of the output transformer of the constant current generator to form a series circuit. Each of the load circuits includes a switch for disconnecting the load circuit from the series circuit, a circuit contact for short-circuiting the load circuit, and an interlock control for preventing the circuit contact from being opened when the switch is opened. The constant current generator always outputs a constant current regardless of the size of the load.Therefore, the load circuit to be extinguished can be short-circuited by the circuit contactor. It can be turned off without affecting the blinking state of the circuit. Further, after a load circuit to be lit is incorporated into a series circuit by a switch, it can be lit without affecting the blinking state of other load circuits by simply opening the circuit contactor.

  Further, according to the constant current generator system for an electroluminescent light source according to claim 2, in addition to the effect exhibited by the constant current generator system for an electroluminescent light source according to claim 1, the secondary winding of the output transformer is provided. A plurality of output side switching taps that finely adjust the amplitude of the AC constant current generated on the wire are provided in the secondary winding of the output transformer, so that dust adheres to the lamp glove and the brightness is reduced. Even in this case, the load current flowing through the lamp can be increased by switching the output side switching tap to compensate for the decrease in luminance, so that an electroluminescent light source having a longer life than a thermoluminescent light source is in operation. Thus, the safety required luminance of 100% can be maintained until the lifetime of the electroluminescent light source is exhausted without repeating special maintenance.

  Moreover, according to the constant current generator system for an electroluminescent light source according to claim 3, in addition to the effect exhibited by the constant current generator system for an electroluminescent light source according to claim 1 or 2, the electroluminescent light source includes Due to being an LED, the LED is made of a solid structure called a pn junction using a semiconductor, and light is emitted by directly converting the energy of electrons into light energy in this structure. Since no heat or movement is required, excellent durability, impact resistance, long life, and high efficiency can be realized.

  Moreover, in a thermoluminescent light source such as a halogen lamp, it was necessary to install an overcurrent relay in order to prevent the filament from fusing due to overcurrent. Since there is no need to install an overcurrent relay without fusing, the device configuration can be simplified.

  The constant current generator system for an electroluminescent light source according to the present invention includes a commercial AC power source, a constant current supply capacitor, and a primary winding of an output transformer connected in series and a secondary winding of the output transformer. A constant current generator in which a plurality of input side switching taps for linearly changing the amplitude of the AC constant current generated in the wire is provided in the primary winding of the output transformer, and a plurality of lights equipped with an electroluminescent light source. A load circuit connected in series, and a plurality of the load circuits are connected in series to the secondary winding of the output transformer of the constant current generator to form a series circuit, the load circuit Each having a switch for disconnecting the load circuit from the series circuit, a circuit contact for short-circuiting the load circuit, and an interlock control mechanism for preventing the circuit contact from being opened when the switch is opened. Easy to load circuit The circuit configuration should be able to increase the brightness adjustment accuracy, control the blinking of each load circuit connected in series, and reduce the maintenance burden of the lamp. For example, any specific embodiment may be used.

An embodiment of the present invention will be described with reference to FIGS.
Here, FIG. 1 is a circuit diagram of a constant current generator which is one of the main components of a constant current generator system for an electroluminescent light source which is an embodiment of the present invention, and FIG. It is a circuit diagram of the load circuit which is another one of the main components of a constant current generator system. FIG. 3 is a circuit diagram when all five load circuits are connected in series to a constant current generator in a light-off state, and FIG. 4 is a circuit diagram in which three load circuits among the five load circuits are lighted in series. It is a circuit diagram when connected to a constant current generator.

  As shown in FIG. 1, a constant current generator 100 which is one of the main components of a constant current generator system for an electroluminescent light source according to an embodiment of the present invention includes a commercial AC power supply 110 and a constant capacitance C. And a primary winding 130P of the output transformer 130 are connected in series. Further, as shown in FIG. 3, five load circuits 300, 400, 500, 600, in which a plurality of lamps including an electroluminescent light source are connected in series to the secondary winding 130S of the output transformer 130, 700 via switches 302, 402, 502, 602, 702 that disconnect each of these load circuits from the series circuit and circuit contacts 301, 401, 501, 601, 701 that short circuit each of these load circuits. It is connected.

  In the load circuits 300, 400, 500, 600, 700, for example, a necessary number of lights are appropriately connected in series according to the application such as an approach light, a runway light, and a taxiway light at an airport. As an example, the circuit configuration of the load circuit 300 is shown in FIG. In this embodiment, an LED is used as the electroluminescent light source constituting the lamp.

  As shown in FIG. 2, in order to prevent the other electroluminescent light source 300B from being affected even if any one of the electroluminescent light sources 300B installed in a plurality of lamps connected in series is not lit. Each lamp constituting the load circuit 300 is provided with an insulating transformer 300A. And the backflow prevention diode 300C for interrupting the reverse current applied to the electroluminescent light source 300B is connected in series with the electroluminescent light source 300B. In addition, instead of blocking the reverse current applied to the electroluminescent light source 300B using the backflow prevention diode 300C, two electroluminescent light sources 300B connected in parallel so that their polarities are opposite to each other are connected to the insulating transformer 300A. It may be connected to the secondary side. In this case, the two electroluminescent light sources 300B are alternately lit when energizing the sine wave alternating current in the forward direction and in the reverse direction, improving the energy efficiency and further reducing the flickering of the lamp constituting the load circuit 300, The effect is enormous.

Further, a plurality of input-side switching taps 130A for varying the amplitude of the alternating constant current I ₂ generated in the secondary winding 130S output transformer 130 to linearly, the primary winding 130P of the output transformer 130 Is provided. The input-side switching tap 130A has a required luminance (%) change stage, for example, 100%, 30%, 25%, 10%, 5%, 1%, 0.2% as shown in FIG. And the number of turns of the primary winding 130P is provided in a proportional relationship. In FIG. 1, the input side switching taps corresponding to 5%, 1%, and 0.2% are not shown.

Since the voltage drop in the output transformer 130 is sufficiently smaller than the voltage between the terminals of the capacitor 120, the output voltage of the commercial AC power supply 110 is constant at V (volt), and the capacitance of the capacitor 120 is C By being fixed at (Farad), for example, 200 μF, a constant current I ₁ corresponding to the capacitance C flows through the primary winding 130P of the output transformer 130. Further, the product I ₁ · T ₁ (ampere turn) of the constant current I ₁ and the number of turns T ₁ to the selected input side switching tap, the AC constant current I ₂ generated in the secondary winding 130S, and the two Since the product I ₂ · T ₂ (ampere turn) with the number of turns T ₂ of the secondary winding 130S is constant, that is, the relationship of I ₁ · T ₁ = I ₂ · T ₂ is established, I ₁ is as described above. in constant, when fixing the number of turns T ₂ of the secondary winding 130S, secondary winding of the alternating constant current I ₂ output transformer 130 which is proportional to the number of turns T ₁ of the to each input-side switching taps 130S Occurs.

As a result, the input side changeover switch 130B, desired by selecting the input-side switching taps 130A, alternating constant current proportional to the number of turns T ₁ of the secondary winding 130S to the primary winding 130P of the output transformer 130 I ₂ can be generated. For example, if T ₁ is 1000 turns and T ₂ is 3000 turns, which is three times T ₁ , I _{1 is set} to a constant current of 20 A, so that I ₂ is 6.6 A which is one third of I ₁ Constant current is obtained. Then, by switching the _{T 1} to 300 turns of 30% of the number of whole volume, as _{I 2,} a constant current of 1.98A is 30% of 6.6A is obtained.

Further, as shown in FIG. 1, the constant current generator 100 constituting the present embodiment has, for example, 0%, 1%, 3% with respect to the total number of turns in the secondary winding 130 </ b> S of the output transformer 130. A plurality of output-side switching taps 130C that reduce the number of turns at fine intervals of 5% are provided. Then, the output side changeover switch 130D, by selecting a desired output-side switching tap 130C, the relationship _{I 1 · T 1 = I 2} · T 2 described above, the number of turns _{T 2} of the secondary winding 130S since it is possible to slightly decrease, can be slightly amplitude of the AC constant current I ₂ supplied to the load (a few percent of the increase). Thereby, when dust adheres to the glove of a light and brightness falls, it can finely adjust so that initial brightness may be maintained. Here, the reason why the switching tap for fine adjustment of the brightness of the lamp is provided on the secondary side of the output transformer 130 is that the load current is changed without changing the linear relationship of the number of turns of the input side switching tap 130A provided on the primary side. It is because it can increase slightly.

  Next, lighting and extinguishing operations of a plurality of load circuits connected in series to the constant current generator constituting this embodiment will be described with reference to FIGS. As shown in FIG. 3, five load circuits 300, 400, 500, 600, and 700 are connected in series to the secondary winding of the output transformer of the constant current generator 100. Then, switches 302, 402, 502, 602, 702 for separating each of these load circuits from the series circuit and circuit contacts 301, 401, 501, 601, 701 for short-circuiting each of these load circuits are provided. ing. The circuit contacts 301, 401, 501, 601 and 701 are provided closer to the constant current generator 100 than the switches 302, 402, 502, 602 and 702, and the switches 302, 402, 502 and 602 are provided. , 702 is in an open state, an interlock control mechanism (not shown) is provided in each circuit contactor and switch so that the circuit contactors 301, 401, 501, 601 and 701 are not opened. Yes. This prevents a series circuit including a plurality of load circuits connected in series from being opened.

  FIG. 3 shows a circuit in which all circuit contacts 301, 401, 501, 601 and 701 are in a short-circuited state and all switches 302, 402, 502, 602 and 702 are in an open state. That is, the output terminal (secondary winding) OUT of the output transformer of the constant current generator 100 is short-circuited. However, as described above, according to the constant current generator 100 according to the present invention, since a constant current is generated in the secondary winding of the output transformer regardless of the size of the load, the output terminal OUT is short-circuited. Even if it becomes, an influence will not spread to the power supply side of the constant current generator 100. From this state, that is, all the load circuits 300, 400, 500, 600, 700 are in the off state and the output terminal OUT of the constant current generator 100 is in a short circuit state, one load circuit 300 is turned on. To do so, first, the switch 302 is turned on (conductive state), and then the circuit contactor 301 is turned off (open state). Other load circuits 400, 500, 600, and 700 can be turned on by the same operation.

  FIG. 4 shows a circuit in which the circuit contacts 401 and 601 are in a short circuit state and the switches 402 and 602 are in an open state. That is, three load circuits 300, 500, and 700 are connected in series between the output terminals OUT of the constant current generator 100, and each of them is in a lighting state. When one load circuit 500 is turned off from this state, first, the circuit contactor 501 is turned ON (short circuit state). At that moment, two load circuits 300 and 700 are connected in series between the output terminals OUT of the constant current generator 100, and the load circuit 500 is turned off. Thereafter, the switch 502 is opened. As a result, of the three load circuits 300, 500, and 700 that are connected in series, only the load circuit 500 can be turned off without the lighting state of the two load circuits 300 and 700 being interrupted.

  The ON / OFF operation of the circuit contacts 301, 401, 501, 601, 701 and the switches 302, 402, 502, 602, 702 can be performed using a general-purpose sequence control panel capable of remote control.

  In the above-described embodiment, the number of load circuits connected to the constant current generator is five. However, the number of load circuits is not limited to five, and may be any number. It doesn't matter.

  Further, in the constant current generator 100 constituting the current generator system for the electroluminescent light source of the present invention, the installation position of the input side switching tap 130A provided in the primary winding 130P of the output transformer 130 is shown in FIG. By changing the input-side switching tap 130A for a conventional thermoluminescent light source, the conventional constant current device can be used. Similarly, it can be used as a power source that outputs a current corresponding to a desired luminance.

  The present invention applies a principle that a constant current corresponding to the capacitance C is generated when a constant voltage V is applied to a constant current supply capacitor of the capacitance C, and a constant current generator with a very simple configuration is applied. In addition to being able to be configured, only a desired load circuit among a plurality of load circuits connected in series to a constant current generator can be controlled ON / OFF regardless of the ON / OFF state of other load circuits, Not only airfield lighting systems, but also high ON / OFF control of lighting systems for public facilities such as highways, tunnels, stadiums, parks, etc., high accuracy of brightness adjustment, high energy efficiency, high maintenance burden Mitigation can be realized and its industrial applicability is very high.

The circuit diagram of the constant current generator of the constant current generator system for electroluminescent light sources of this invention. The circuit diagram of the load circuit of the constant current generator system for electroluminescent light sources of this invention. The circuit diagram when the five load circuits connected in series with the constant current generator are all in the light-off state. The circuit diagram when three of the five load circuits connected in series to the constant current generator are in a lighting state. The circuit diagram of the conventional constant current luminous intensity adjustment apparatus for thermoluminescent light sources. The signal waveform diagram in each part of the conventional constant current light intensity adjustment apparatus shown in FIG. The table | surface which showed the electric current-luminance characteristic of the electroluminescent light source and the thermoluminescent light source. The graph based on the table | surface shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Constant current generator 110 ... Commercial alternating current power supply 120 ... Capacitor 130 ... Output transformer 130A ... (Output transformer) Input side switching tap 130B ... (Output transformer) ) Input side changeover switch 130C... (Output transformer) output side changeover tap 130D... (Output transformer) output side changeover switch 130P... (Output transformer) primary side winding 130S. Secondary windings 300, 400, 500, 600, 700 (load transformer) 300, 401, 501, 601, 701 (load circuit) circuit contacts 301, 401, 501, 601, 701... (Load circuit) switch 300 A... (Load circuit 300) insulation transformer 300 B... (Load circuit 300) electroluminescent light source 300 C. 0) backflow prevention diode 200 ... constant current light intensity adjustment device 210 ... commercial AC power supply 220 ... resonance circuit 220A ... (resonance circuit) capacitor 220B ... (resonance circuit) reactor 230 ..Output transformer 230P ... Primary side winding 230S (of the output transformer) Secondary side winding 240 (of the output transformer) ... Light 240A ... Insulation transformer 240B (of the light) ... (light) thermoluminescent light source 240C ... (light) backflow prevention diode 250 ... shunt circuit 250A ... (shunt circuit) thyristor 250B ... (shunt circuit) thyristor 260 -Cycle control circuit 270 ... Current detector 280 ... Wiring

Claims (3)

A commercial AC power source, a constant current supply capacitor, and a primary winding of the output transformer are connected in series, and the amplitude of the AC constant current generated in the secondary winding of the output transformer is linearly changed. An electroluminescent device comprising: a constant current generator having a plurality of input side switching taps provided in a primary winding of the output transformer; and a load circuit in which a plurality of lamps having an electroluminescent light source are connected in series. A constant current generator system for a light source,
A plurality of the load circuits are connected in series to the secondary winding of the output transformer of the constant current generator to form a series circuit, and each of the load circuits disconnects the load circuit from the series circuit. A constant current generator system for an electroluminescent light source, comprising: a switch and a circuit contact that short-circuits the load circuit; and an interlock control mechanism that prevents the circuit contact from being opened when the switch is opened.   A plurality of output side switching taps for finely adjusting the amplitude of the AC constant current generated in the secondary winding of the output transformer is provided in the secondary winding of the output transformer. The constant current generator system for an electroluminescent light source according to claim 1.   The said electroluminescent light source is LED, The constant current generator system for electroluminescent light sources of Claim 1 or Claim 2 characterized by the above-mentioned.

Images