JP5116641B2 - Constant current generator switching system for ship traffic signals - Google Patents

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). More specifically, the present invention relates to a large number of long wiring distances such as a ship traffic signal board. The present invention relates to a constant current generator switching system for a ship traffic signal in which lighting equipment composed of lights is alternately turned on by two power supplies for regular use and substitute use.

  In general, in harbors and straits, various visual information devices are arranged to operate a ship safely even when visibility is poor due to bad weather or at night. These visual information devices provide a ship traffic signal that informs the ship of a viewing distance and a stop standby position, a tidal current signal that informs the direction of the tidal current, and the like by means of LED display boards.

  In such a ship traffic signal system, since a large number of lamps equipped with a thermoluminescent light source such as a tungsten lamp and a halogen lamp are arranged over a wide range, in order to supply electric power to these many lamps, Very long distance wiring 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. This constant current light intensity adjustment device 200 is connected in series to a commercial single-phase AC power supply 210 and the commercial single-phase AC power supply 210, and has a time constant that satisfies a predetermined resonance condition with the output of the commercial single-phase AC power supply 210. , A resonance circuit 220 that outputs a constant sine wave AC current I that is unrelated to load fluctuations, 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, when a resonance circuit 220 is connected in series to a commercial single-phase AC power supply 210, the constant current luminous intensity adjustment device 200 is determined from the capacitor 220A and the reactor 220B so as to satisfy a predetermined resonance condition. By selecting the constant and the frequency, voltage, and current of the AC power supply output, a constant current I that is unrelated to 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 is composed of 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, and minus During this period, the thyristor 250B is turned on.

FIG. 8 is a signal waveform diagram showing signals at various parts of the conventional constant current light intensity adjustment device 200 shown in FIG. 7, and here, eight periods of the sine wave of the current I output from the resonance circuit 220 (period T1). A case where one cycle (cycle T2) of the minutes 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, when the wave number ratio R = 1/8, as shown in FIG. 8, the shunt circuit 250 is configured to short-circuit one period (period T2) of eight periods (period T1) of the sine wave of the current I. to control. 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 single-phase 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. 7, 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. 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 ship traffic signal systems in which a large number of lights are arranged over a wide range, in consideration of power consumption and maintainability, lamps using filaments such as tungsten lamps and halogen lamps as described above, so-called heat, are used. The introduction of so-called electroluminescent light sources that do not have filaments such as LEDs and HID lamps that can efficiently obtain a desired luminescent color, have no fear of a broken bulb (broken filament), and are not a light emitting light source. It is being considered.

  However, in a conventionally used thermoluminescent light source such as a tungsten lamp or a halogen lamp, the luminance of the light source relative 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 that it cannot cope with a ship traffic signal system using an electroluminescent light source because it cannot accurately adjust a minute load current amount.

  Moreover, in a ship traffic signal system using an electroluminescent light source, when the luminance is lowered to 0.2%, the necessary current may be 0.2% when the luminance is 100%, whereas the conventional current is sufficient. In a lighting system using a thermoluminescent light source, even when the brightness is lowered to 0.2%, a current of 40% or more when the brightness is 100% is required, and the energy efficiency is extremely poor. there were.

  Further, in order to eliminate a power failure, the ship traffic signal system is equipped with a substitute constant current light intensity adjustment device 500 in addition to the regular constant current light intensity adjustment device 200 as shown in FIG. In the conventional constant current light intensity adjustment device 200, the switch 201 of the regular constant current light intensity adjustment device 200 is turned on, and then the switch 201 is turned off to replace the substitute constant current light intensity adjustment device 500. The switch 501 is turned on to switch between the regular power supply and the substitute power supply. In that case, since the voltage is applied to the load circuit 600, an arc is generated in the switch 201. Therefore, if the switch 501 is not turned on after the arc is completely cut off, the substitute constant-current light intensity adjusting device 500 causes a short-circuit accident, so that the switching time of the power source is prolonged. In particular, in a ship traffic signal system for a huge ship, if a power supply switching time is prolonged and a power outage state of a load circuit is prolonged, a huge ship having a large inertia falls into a long and uneasy state. Therefore, it has been a long-standing problem to compress the switching time of the power supply for regular use and substitute use.

Furthermore, in recent years when global warming has become a serious social problem, there is a great interest in developing a ship traffic signal 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. With a simple circuit configuration, the brightness adjustment is highly accurate and the flickering of the lamp is reduced when the load current is reduced. The switching time between the two power supplies for regular use and substitution is reduced, and the maintenance work for the lamp is reduced. An object of the present invention is to provide a constant current generator switching system for ship traffic signals that can be performed.

  First, according to the first aspect of the present invention, a commercial AC single-phase power source, a constant current supply capacitor, and a primary winding of an output transformer are connected in series and a secondary winding of the output transformer. Two constant current generators for normal use and substitute for which a plurality of input side switching taps for linearly changing the amplitude of the AC constant current generated in the output transformer are provided in the primary winding of the output transformer, and electroluminescence A constant current generator switching system for ship traffic signals, comprising a load circuit in which a plurality of lights having a light source are connected in series, wherein the AC constant currents output by the two constant current generators are reversed. The series circuit is connected in series so as to be in phase and connected to the load circuit to form a series circuit, and each of the two constant current generators short-circuits the output terminal of the constant current generator. By having a circuit contactor to disconnect from Problems are those that were resolved.

  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 with respect 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 single-phase AC power source” means a power source having a voltage of 100 V or 200 V and a frequency of 50 Hz (eastern Japan) or 60 Hz (western Japan) supplied from an electric power company. Can be used in place of a commercial single-phase AC power source if it is a low frequency AC power source of about 400 Hz or less. 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 switching system for ship traffic signals according to the present invention includes a commercial single-phase AC power source with an output voltage of V (volts), a constant current supply capacitor with a capacitance C (farad), and the primary side of the output transformer. A plurality of input side switching taps, which are connected in series with the winding and linearly change the amplitude of the AC constant current generated in the secondary side winding of the output transformer, include the primary side winding of the output transformer. The stored charge can be obtained by a very simple configuration comprising two regular current generators and a constant current generator provided in the main body, and a load circuit in which a plurality of lamps equipped with an electroluminescent light source are connected in series. since Q is fixed, the primary winding of the output transformer, the constant current I ₁ corresponding to the electrostatic capacitance C (farads) flows, is connected in series with the secondary winding of the output transformer Load (number and arrangement of light-emitting electroluminescent light sources Even if the load is short-circuited, for example, even if the load is short-circuited, the power supply voltage will not be affected, and the output transformer will always be stable. current supply can be realized. 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 to.

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. Further, unlike the voltage-type tap switching, the current-type tap switching does not generate a potential difference between the taps, so that the occurrence of a failure such as a dielectric breakdown is 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 switching system for ship traffic signals according to the first aspect of the present invention, the AC constant currents output from the two constant current generators are connected in series so as to be in reverse phase and By connecting to a load circuit to form a series circuit, each of the two constant current generators has a circuit contactor that shorts the output end of the constant current generator and disconnects from the series circuit, When both of the circuit contacts of the two constant current generators are short-circuited, no current flows through the load circuit, and each constant current generator can perform an operation test with the output terminal short-circuited. . Further, by opening one of the circuit contactors, the open-side constant current generator is instantaneously connected to the load circuit. In addition, when switching two constant current generators, one circuit contactor is short-circuited and at the same time the other circuit contactor is opened, so that the two constant current generators can be switched without requiring much switching time. Realize. In addition, even if both circuit contacts are open, the constant current generators output by the two constant current generators are connected to each other because the outputs of the two constant current generators are connected in opposite phases. Since the currents cancel each other, it is avoided that an overcurrent flows through the load circuit. Therefore, it is possible to realize a constant current generator switching system suitable for a 24-hour in-port traffic information transmission management system capable of instantaneous change in which two constant current generators for regular use and substitute use are always in operation.

  Further, according to the constant current generator switching system for ship traffic signals according to claim 2, in addition to the effect exhibited by the constant current generator switching system for ship traffic signals according to claim 1, the secondary of the output transformer A plurality of output-side switching taps that finely adjust the amplitude of the AC constant current generated in the side windings are provided in the secondary winding of the output transformer, so that dust adheres to the lamp glove and brightness. Even when the output is reduced, it is possible to compensate for the decrease in brightness by increasing the load current flowing to the lamp by switching the output side switching tap. The safety required luminance of 100% can be maintained until the lifetime of the electroluminescent light source is exhausted without repeating special maintenance during operation.

  According to the ship traffic signal constant current generator switching system according to claim 3, in addition to the effect of the ship traffic signal constant current generator switching system according to claim 1 or claim 2, the electroluminescence Since the light source is 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 motion intervention is required, it is possible to achieve excellent durability, impact resistance, long life, and high efficiency.

  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.

  In the constant current generator switching system for ship traffic signals according to the present invention, a commercial AC single-phase power source, a constant current supply capacitor, and a primary winding of an output transformer are connected in series, and two of the output transformers are connected. Two constant current generators for normal use and substitute use, in which a plurality of input side switching taps for linearly changing the amplitude of the AC constant current generated in the secondary winding are provided in the primary winding of the output transformer And a load circuit in which a plurality of lights equipped with an electroluminescent light source are connected in series, and the AC constant currents output from the two constant current generators are connected in series so that they are in reverse phase. Connected to the load circuit to form a series circuit, and each of the two constant current generators has a circuit contactor for short-circuiting the output terminal of the constant current generator and disconnecting from the series circuit LED or HID lamp In addition to improving the accuracy of brightness adjustment with a simple circuit configuration for a load circuit in which a plurality of lamps using so-called electroluminescent light sources are connected in series, switching between two power supplies for regular use and substitute use As long as the time can be reduced and the maintenance load of the lamp can be reduced, 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 regular constant current generator that is one of the main components of a constant current generator switching system for ship traffic signals according to 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 the constant current generator switching system for ship traffic signals. 3 to 6 are state diagrams of the circuit contactor for explaining the switching operation between the regular constant current generator and the substitute constant current generator.

  As shown in FIG. 1, a regular constant current generator 100 which is one of the main components of a constant current generator switching system for ship traffic signals according to an embodiment of the present invention includes a commercial single-phase AC power supply 110 and A capacitor 120 having a constant capacitance C (Farad) and a primary winding 130P of the output transformer 130 are connected in series.

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 It is provided. The input-side switching tap 130A has a required luminance (%) change stage, for example, as shown in FIG. 9, 100%, 30%, 25%, 10%, 5%, 1%, 0.2%. 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 single-phase AC power supply 110 is constant at V (volt), and the capacitance of the capacitor 120 When C (Farad) is fixed, for example, 200 μF, a constant current I ₁ corresponding to the capacitance C (Farad) 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 up to the selected input side switching tap, the AC constant current I ₂ generated in the secondary winding 130S, and the two 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, so that 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 occur.

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 a 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 regular constant current generator 100 constituting the present embodiment has, for example, 0% and 1% of the total number of turns in the secondary winding 130S of the output transformer 130. A plurality of output-side switching taps 130C that reduce the number of turns at fine intervals of 3% and 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. This is because it can be slightly increased. The substitute constant current generator constituting this embodiment is the same circuit as the regular current generator shown in FIG.

  Then, two constant current generators for regular use and substitute use are connected in series so that the AC constant current to be output is in reverse phase. Here, since the two constant current generators are supplied with power from the same commercial AC single-phase power supply 110, in the circuit shown in FIG. 1, the A terminals or the B terminals of the output terminals OUT are connected to each other. Thus, the two constant current generators are connected in series so that the AC constant current to be output is in reverse phase. Then, a load circuit is connected between the open output terminals OUT, and the two constant current generators and the load circuit form a series circuit. Further, a circuit contactor for short-circuiting the output terminal OUT and disconnecting from the series circuit is connected to each of the output terminals OUT of the two constant current generators (see FIGS. 3 to 6).

  In the load circuit, for example, a necessary number of lights are connected in series as appropriate in accordance with applications such as a control signal board in a harbor or a strait, an electric information bulletin board, and the like. As an example, a circuit configuration of a load circuit 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.

  Next, the switching operation of the two constant current generators for regular use and substitute for use in this embodiment will be described with reference to FIGS.

  In FIG. 3, the circuit contactor 101 and the circuit contactor 401 connected to the output terminals OUT of the regular constant current generator 100 and the substitute constant current generator 400 are both short-circuited. At this time, no current flows through the load circuit 300. In the constant current generators 100 and 400, the output terminal OUT is in a short circuit state. However, as described above, the constant current generator according to the present invention always outputs a constant current regardless of the fluctuation of the load. There is no worry about waking up.

  FIG. 4 shows that, of the circuit contactor 101 and the circuit contactor 401 connected to the output terminals OUT of the regular constant current generator 100 and the substitute constant current generator 400, only the circuit contactor 101 is opened. Is in a state. At this time, a current is supplied to the load circuit 300 from the regular constant current generator 100. In the substitute constant current generator 400, the output terminal OUT is in a short circuit state, and no current is supplied to the load circuit 300.

  FIG. 5 shows that, of the circuit contactor 101 and the circuit contactor 401 connected to the output terminals OUT of the regular constant current generator 100 and the substitute constant current generator 400, only the circuit contactor 401 is opened. Is in a state. At this time, the load circuit 300 is supplied with a current from the substitute constant current generator 400. The regular constant current generator 100 does not supply current to the load circuit 300 because the output terminal OUT is short-circuited. Here, as described above, the constant current generator according to the present invention does not obtain a constant current by voltage control, but generates a constant current regardless of load fluctuations, so an arc is generated in a circuit contactor. The power supply from the regular constant current generator 100 shown in FIG. 4 and the power supply from the substitute constant current generator 400 shown in FIG. 5 can be switched instantaneously.

  FIG. 6 shows that the circuit contactor 101 and the circuit contactor 401 connected to the output terminals OUT of the regular constant current generator 100 and the substitute constant current generator 400 are both open. At this time, since the output terminals OUT of the constant current generator 100 and the constant current generator 400 are connected in opposite phases, currents output from the respective outputs cancel each other and no current flows through the load circuit 300.

  Further, in the constant current generator 100 constituting the ship traffic signal current generator switching system 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. A conventional constant current device is provided by switching the input side switching tap 130A for a conventionally used thermoluminescent light source by providing it corresponding to the relationship between the indicated luminance (%) and the thermoluminescent light source current (A). Similarly to the above, it can be used as a power source for outputting 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 capacitor for supplying a current having a constant capacitance C (Farad). A constant current generator that generates a constant current regardless of fluctuations can be configured, and the two constant current generators for regular use and substitution can be switched instantaneously, and further, abnormalities and dangers at sea can be avoided. By adding the Morse signal to inform, the function in terms of safety measures can be improved, and by increasing the safety of traveling in the port, large vessel guidance control becomes possible. In addition, guidance control of small ships can be performed in the same way, and it can play a part in providing visual information in accordance with the controller's radio information, improving the safety of ship traffic signal systems in ports and straits, and improving brightness adjustment. It can achieve high accuracy, high energy efficiency, and reduced maintenance burden, and its industrial applicability is extremely high.

The circuit diagram of the constant current generator of the constant current generator switching system for ship traffic signals of this invention. The circuit diagram of the load circuit of the constant current generator switching system for ship traffic signals of this invention. The figure which shows the switching operation of the constant current generator for regular of this invention, and the constant current generator for substitution. The figure which shows the switching operation of the constant current generator for regular of this invention, and the constant current generator for substitution. The figure which shows the switching operation of the constant current generator for regular of this invention, and the constant current generator for substitution. The figure which shows the switching operation of the constant current generator for regular of this invention, and the constant current generator for substitution. 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. The figure which shows the switching operation | movement of the conventional constant current light intensity adjustment apparatus for regular and the constant current light intensity adjustment apparatus for substitution.

Explanation of symbols

100, 400 ... constant current generators 101, 401 ... circuit contactor 110 ... commercial single-phase AC power supply 120 ... capacitor 130 ... output transformer 130A ... (of the output transformer) Input-side changeover tap 130B (output transformer) Input-side changeover switch 130C (output transformer) Output-side changeover tap 130D (output transformer) Output-side changeover switch 130P Primary winding 130S (of the output transformer) Secondary winding 300 of the output transformer ... Load circuit 300A ... Isolation transformer 300B (of load circuit 300) ... (Load circuit) 300) electroluminescent light source 300C (back-load prevention diode 200, 500 of load circuit 300) ... constant current light intensity adjustment device 210 ... commercial single-phase AC power supply 220 ... resonance circuit 220A .. (Resonance circuit) Capacitor 220B (Resonance circuit) Reactor 230 ... Output transformer 230P ... (Output transformer) Primary winding 230S ... (Output transformer) Secondary winding 240... Lamp 240A... (Lamp) insulation transformer 240B... (Light) thermoluminescent light source 240C... (Lamp) backflow prevention diode 250... Shunt circuit 250A. Thyristor 250B (for shunt circuit) Thyristor 260 (for shunt circuit) Cycle control circuit 270 Current detector 280 Wiring

Claims (3)

A commercial AC single-phase power supply, 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 linear. Two constant-current generators for regular use and substitution, which are provided on 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 switching system for a ship traffic signal comprising a load circuit that is
The AC constant currents output by the two constant current generators are connected in series so as to be in reverse phase and connected to the load circuit to form a series circuit,
Each of the two constant current generators has a circuit contactor for short-circuiting the output terminal of the constant current generator and disconnecting it from the series circuit. system.   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 switching system for ship traffic signals according to claim 1.   3. The constant current generator switching system for ship traffic signals according to claim 1, wherein the electroluminescent light source is an LED.

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