JP2008181781A - Led beacon light lighting device and led beacon light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED beacon light lighting device used at low light intensity capable of automatically switching connection in a current transformer at the time of actual usage and scheduled inspection, and an LED beacon light equipped with the above LED beacon light lighting device. <P>SOLUTION: The LED beacon light lighting device 1 is provided with a current transformer 2, a light-emitting diode 4 lighting by selectively supplying electric current through an output winding 2b of the current transformer 2 or a middle tap 8c, electric current detection means R1, R2, 5 for detecting electric current flowing in the light-emitting diode 4 and outputting control signals corresponding to the detected current value, and a connection switching means 6 for making the output winding 2b of the current transformer 2 or the middle tap 8c supply current to the light-emitting diode 4 in response to the control signal. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an LED marker lamp lighting device in which a light emitting diode is lit at a predetermined luminous intensity ratio, and an LED marker lamp including the LED marker lamp lighting device.

  Conventionally, low-light aerial beacon lights, such as taxiway beacon lights, have used light bulb-type beacon lights that use incandescent light bulbs such as halogen light bulbs as the light source, and are practically lit at a luminous intensity ratio of 10% of the rating. Has been. In recent years, LED-type marker lamps using light-emitting diodes as light sources instead of the incandescent bulbs have been studied. If a light-emitting diode is used as the light source, power saving and a long life are achieved, so that maintenance costs can be greatly reduced. In addition, since various color lights can be obtained according to the type of the light emitting diode, there is an advantage that a color filter or the like can be omitted. And if all the bulb-type marker lights are replaced with LED-type marker lights, the equipment cost becomes enormous, so at present, the bulb-type marker lights and the LED-type marker lights are mixed and connected in series to a common AC constant current power source. It is realistic to connect them.

  By the way, the light output characteristic with respect to the current in the incandescent lamp and the light output characteristic with respect to the current in the light emitting diode are largely different as shown in FIG. In other words, the incandescent lamp has an optical output that changes exponentially with respect to the current. For example, the incandescent lamp is rated on (rated 100%) at a rated current of 6.6 A and rated at 4.8 A (72.7% of the rated current). Is lit at a luminous intensity ratio of 10%. On the other hand, the light output of the light emitting diode linearly changes with respect to the current, is lit at a rated current of 6.6A (100% lit), and at a luminous intensity ratio of 72.7% rated at 4.8A. The current that is turned on and turned on at a luminous intensity ratio of 10% of the rating is 0.66 A (10.0% of the rated current). Here, the current is a current supplied from an AC constant current power source, and indicates a current flowing through the primary winding of the current transformer. The light-emitting diode actually has a rated current of 0.7A and a current that is lit at a luminous intensity ratio of 10% of the rated current of 0.07A (10.0% of the rated current) due to the current flowing in the secondary winding of the current transformer. ).

  In such a situation, when a low-luminance 4.8 A current is supplied from an AC constant current power supply, the light bulb-type marker lamp outputs a light with a luminous intensity ratio of 10% of the rated value. The light output of the light intensity ratio is 72.7% of the rated value. Therefore, the light output of the light emitting diode in the LED type marker lamp is such that each of the light bulb type marker lamp and the LED type marker lamp connected in series outputs a light having a predetermined luminous intensity ratio (for example, 10% of the rated lighting). Have been made to adjust. For example, an LED-type marker lamp lighting device has been proposed that duty-controls the current flowing through a light-emitting diode so that the luminous intensity of the light-emitting diode is equal to the luminous intensity of a bulb with respect to the output current from an AC constant current power supply (patent) Reference 1). This LED-type marker lamp lighting device according to the prior art includes an input current detection circuit for detecting an output current from an AC constant current power supply, and a light output characteristic with respect to a current in a light emitting diode with respect to an output current from an AC constant current power supply. And a duty control circuit that performs duty control so that the current flowing through the light emitting diode becomes the current converted by the characteristic conversion circuit.

  In addition, an air traffic sign lamp is proposed in which the resistance value of a variable resistor connected in series to a light emitting diode is changed to control the current flowing through the light emitting diode to obtain a light output similar to that of an incandescent bulb (Patent Document 2). reference.). This prior art aviation beacon lamp has a current detection circuit unit for detecting a gradation current (output current) from an AC constant current power supply, and based on the detection result, the brightness of the incandescent bulb according to the gradation current can be obtained. A gradation conversion circuit section that generates such a gradation signal and a drive circuit section that includes an LED drive circuit section that changes the resistance value of the variable resistor by the gradation signal.

  Also, there is a marker lamp system in which a shunt circuit is connected to the output side of a rectifier that rectifies a voltage obtained from an AC constant current power supply through an isolation transformer, and a marker lamp having a light emitting diode as a light source is connected in parallel with the shunt circuit. It has been proposed (see Patent Document 3). In this prior art beacon lamp system, the shunt circuit has a large impedance when the output of the rectifier is large, a small impedance when the output of the rectifier is small, and the light output of the light emitting diode approximates the light output of the bulb. The output of the rectifier is shunted.

  However, for LED beacon lamps that illuminate light emitting diodes at low luminous intensity (for example, 10% of the rating), the LED beacon lamp lighting device disclosed in Patent Document 1 includes an input current detection circuit, a characteristic conversion circuit, and a duty control circuit. Therefore, it has a disadvantage that it is highly functional and expensive. In addition, the air traffic sign lamp of Patent Document 2 has a drive circuit unit including a current detection circuit unit, a gradation conversion circuit unit, and a drive circuit unit, and thus is highly functional and expensive. . Further, in the marker lamp system of Patent Document 3, the current that is shunted to the shunt circuit in order to adjust the current that flows to the light emitting diode is useless, and it is difficult to save power.

  Therefore, an LED marker lamp having the LED marker lamp lighting device 50 shown in FIG. 4 which is simple and inexpensive and saves power is used for low luminous intensity. The LED marker lamp lighting device 50 is provided with one end connection portion 8a and the other end connection portion 8b at both ends of the secondary winding 2b of the current transformer 2, and an intermediate connection portion 8c between the secondary windings 2b. The input side of the rectifier 3 is connected to either the one end connecting portion 2a and the other end connecting portion 2b, or the one end connecting portion 2a and the intermediate connecting portion 2c by the manual switch SW1. The light emitting diode 4 and the resistor element R1 are connected in series on the output side of the rectifier 3.

  In the LED indicator lamp, the input side of the rectifier 3 is normally connected to one end connection portion 8a and the other end connection portion 8b of the current transformer 2, and the primary winding 2a of the current transformer 2 is supplied with a rated current ( A predetermined current (4.8 A) less than 6.6 A) is supplied. The light emitting diode 4 is turned on at a predetermined luminous intensity ratio (10%) through a predetermined current (70 mA).

Then, the LED indicator lamp is removed from the road surface installation and taken home during periodic inspection (maintenance), and the input side of the rectifier 3 is connected to the one end connection portion 2a and the intermediate connection portion 8c of the current transformer 2, and is connected to the primary winding 2a. The rated current state such as the light output of the light emitting diode 4 is inspected by passing the rated current. And if the said inspection is passed, it will be installed in the original state again.
JP 2006-139755 A (pages 8-9, FIG. 1) JP 2000-173304 A (Pages 7-8, FIGS. 5-6) JP 2006-65724 A (page 6, FIG. 1)

  The LED indicator lamp having the LED indicator lamp lighting device 50 is connected to the intermediate connection portion 8c from the other end connection portion 8b of the secondary winding 2b of the current transformer 2 by the manual switch SW1 during the periodic inspection. Although the switching is performed, it may be forgotten to switch the input side of the rectifying device 3 in the initial state to the one end connection portion 8a and the other end connection portion 8b of the secondary winding 2b of the current transformer 2 after the inspection is completed. As a result, there is a problem in that the LED marker lamp and the bulb-type marker lamp have different luminosities when connected to the AC constant current power source again.

  In addition, during the regular inspection, the switching operation of the manual switch SW1 for a large number of LED marker lamps is troublesome.

  The present invention provides an LED beacon lighting device used at low light intensity that can automatically switch the connection with a current transformer at the time of practical use and periodic inspection, and an LED beacon lamp equipped with the LED beacon lighting device The purpose is to do.

  The invention of the LED marker lamp lighting device according to claim 1 is an insulated current transformer having a current supplied from an output constant AC constant current power source and an output winding having an intermediate tap for changing the output. A light-emitting diode that is turned on when a current is selectively supplied via an output winding or an intermediate tap of a current transformer; a current detection that detects a current flowing through the light-emitting diode and outputs a control signal according to the detected current value; And a current is supplied from the intermediate tap of the current transformer to the light emitting diode according to the control signal of the current detection means when the current from the AC constant current power source is relatively large, and the current from the AC constant current power source is relatively Connection switching means for supplying a current to the light emitting diode from the output winding of the current transformer in response to a control signal of the current detection means when it is small. And wherein the door.

  In the present invention and each of the following inventions, each configuration is as follows unless otherwise specified.

  “The current from the AC constant current power supply is relatively large” means that the light emitting diode is supplied with a high luminous intensity, for example, rated lighting, and “the current from the AC constant current power supply is relatively small” means that the light emitting diode Is supplied at a low luminous intensity, for example, at a luminous intensity ratio of 10% of the rated value.

  There may be one light emitting diode or a plurality of light emitting diodes.

  According to the present invention, when the current from the AC constant current power supply changes, the current flowing through the light emitting diode changes, and a control signal corresponding to the current value is output from the current detection means. The connection switching means selectively supplies current to the light emitting diode via the output winding of the current transformer or the intermediate tap according to the control signal of the current detection means. That is, when the current from the AC constant current power source is relatively large, current is supplied from the intermediate tap of the current transformer to the light emitting diode, and the light emitting diode is turned on at high luminous intensity, for example, rated lighting. When the current from the AC constant current power source is relatively small, current is supplied from the output winding of the current transformer to the light emitting diode, and the light emitting diode is turned on at a low luminous intensity, for example, a luminous intensity ratio of 10% of the rated value.

  The LED marker lamp lighting device according to claim 2 is the LED marker lamp lighting device according to claim 1, wherein the current detecting means detects a current flowing through the light emitting diode by a resistance element, and the current from the AC constant current power source is detected. The resistance value of the resistance element is relatively small when the current is relatively large, and the resistance value of the resistance element is relatively large when the current from the AC constant current power source is relatively small. To do.

  The resistance element may be a variable resistance, or a plurality of resistance elements connected in series or in parallel.

  “The resistance value of the resistance element is relatively small or large” means that the resistance value is set to approach a reference value (reference voltage) with which the voltage across the resistance element is compared.

  According to the present invention, when the current from the AC constant current power source is relatively large and the current flowing through the light emitting diode increases, the resistance value of the resistance element is reduced. The power consumption at is reduced.

  According to a third aspect of the present invention, there is provided the LED indicator lamp lighting device according to the first or second aspect, wherein the current transformer has an auxiliary winding insulated from the output winding. A constant voltage circuit formed by rectifying and smoothing the current flowing through the auxiliary winding is formed between both ends of the line, and the output voltage of the constant voltage circuit is compared with a reference value to be compared with the current value detected by the current detecting means. It is characterized by becoming.

  According to the present invention, since the reference value to be compared with the current value detected by the current detection means is obtained from the constant voltage circuit provided in the auxiliary winding of the current transformer, the reference of the battery or the like for obtaining the reference value is obtained. There is no need to install a voltage source.

  The invention of the LED marker lamp according to claim 4 comprises the LED marker lamp lighting device according to any one of claims 1 to 3; and a lamp body provided with the LED marker lamp lighting device. It is characterized by being.

  According to this invention, the LED marker lamp which comprises the LED marker lamp lighting device as described in any one of Claim 1 thru | or 3 is provided.

  According to the first aspect of the present invention, the connection between the output winding of the current transformer or the intermediate tap and the light emitting diode is automatically switched in accordance with the control signal corresponding to the value of the current detected in the light emitting diode. It is possible to prevent a connection error between the current transformer and the light emitting diode during practical use and periodic inspection.

  According to the second aspect of the present invention, when the current from the AC constant current power source is relatively large and the light emitting diode is lighted at a high luminous intensity, for example, rated lighting, the resistance value of the resistance element that detects the current flowing through the light emitting diode is relatively Therefore, power loss can be reduced, and a low-wattage and inexpensive resistance element can be used.

  According to the invention of claim 3, the reference value to be compared with the current value detected by the current detecting means is supplied from the constant voltage circuit provided on the output side of the auxiliary winding of the current transformer, so that the battery etc. It is not necessary to provide the reference voltage source, and it is not necessary to periodically replace the reference voltage source, so that the LED marker lamp lighting device can be made inexpensive.

  According to the fourth aspect of the present invention, the LED sign lamp lighting device that automatically switches the connection between the current transformer and the light emitting diode in accordance with the current from the AC constant current power source supplied to the current transformer is provided. It is possible to provide an LED marker lamp that saves labor during time and periodic inspections.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, a first embodiment of the present invention will be described.

  1 and 2 show a first embodiment of the present invention, FIG. 1 is a schematic circuit diagram of an LED marker lamp lighting device, and FIG. 2 is a characteristic diagram showing a change in light output with respect to current.

  In FIG. 1, an LED marker lamp lighting device 1 includes a current transformer 2, a rectifier 3, a light emitting diode 4, first and second resistance elements R1, R2, a comparison circuit 5, a connection circuit 6, and a constant voltage circuit 7. Is formed. Here, the rectifier 3, the first and second resistance elements R1 and R2, and the comparison circuit 5 form a current detection means. The connection circuit 6 forms connection switching means.

  The current transformer 2 has a primary winding 2a which is an input winding insulated from each other, a secondary winding 2b as an output winding, and a tertiary winding 2c as an auxiliary winding. One end connecting portion 8a and the other end connecting portion 8b are provided at both ends of the secondary winding 2b, and an intermediate connecting portion 8c as an intermediate tap for changing output is provided in the middle. The primary winding 2a is connected in series with the current transformer 2 of the other LED marker lamp lighting device 1 and the current transformer of the bulb-type marker lamp, and is connected to an AC constant current power source (not shown) whose output is variable. . Then, a relatively small predetermined current (for example, 4.8 A) for turning on the light emitting diode 4 at a predetermined luminous intensity ratio (for example, a luminous intensity ratio of 10% of the rating) is supplied from the AC constant current power source. In addition, a relatively large rated current (for example, 6.6 A) for supplying the light-emitting diode 4 to rated lighting is supplied during regular inspection.

  Then, when the light emitting diode 4 is turned on at a predetermined luminous intensity ratio (for example, a luminous intensity ratio of 10% of the rated value), a current for low luminous intensity (for example, 70 mA) flows through the light emitting diode 4, so The current transformation ratio of the one end connection portion 8a and the other end connection portion 8c of the secondary winding 2b is 68.6: 1. Further, since the rated current (for example, 700 mA) flows through the light emitting diode 4 when the light emitting diode 4 is lit at a rated level, the one end connection portion 8a and the intermediate connection portion 8c of the secondary winding 2b with respect to the primary winding 2a are changed. The flow ratio is 9.4 to 1.

  The rectifier 3 has one end on the input side connected to one end connection portion 8 a of the current transformer 2 and the other end on the input side connected to a common contact 9 c of the relay 9. The normally open contact 9a of the relay 9 is connected to the intermediate connection portion 8c of the current transformer 2 by the lead wire 10a, and the normally closed contact 9b is connected to the other end connection portion 8b of the current transformer 2 by the lead wire 10b. Yes. The input side of the rectifier 3 is connected to one end connection portion 8a of the current transformer 2 by the relay contacts 9c and 9b when a relatively small predetermined current (4.8A) is supplied to the primary winding 2a of the current transformer 2. When the relatively large rated current (6.6 A) is supplied to the primary winding 2a of the current transformer 2 connected to the other end connection portion 8b, the one end connection portion 8a of the current transformer 2 and the relay contacts 9c and 9a It is connected to the intermediate connection part 8c. A surge absorbing varistor VA1 is connected to one end and the other end of the input side of the rectifier 3.

  A series circuit of the light emitting diode 4 and the first resistance element R1 is connected between the outputs of the rectifier 3. The negative side of the output is connected to the substrate ground E. The rectifier 3 rectifies the current flowing through the secondary winding 2 b of the current transformer 2 and supplies it to the light emitting diode 4.

  The light emitting diode 4 is turned on when a current rectified by the rectifying device 3 flows, and emits predetermined color light (for example, blue light). Then, the light emitting diode 4 is selectively supplied via the rectifier 3 through the one end connection portion 8a and the other end connection portion 8b of the primary winding 2b of the current transformer 2 or the one end connection portion 8a and the intermediate connection portion 8c. Is supplied. That is, when a predetermined current (4.8 A) is supplied to the primary winding 2 a of the current transformer 2, a low luminous intensity current (70 mA) is supplied from the rectifier 3, and a predetermined luminous intensity ratio (rated rating of 10 mA). % Luminosity ratio). Further, when the rated current (6.6 A) is supplied to the primary winding 2 a of the current transformer 2, the rated current (700 mA) is supplied from the rectifier 3 and the rated lighting is performed.

  The first resistance element R1 is connected to the light emitting diode 4 in series. Then, the current flowing through the light emitting diode 4 is detected. The resistance value of the first resistance element R1 is set to 3.9Ω, for example.

  The second resistance element R2 is connected in parallel to the first resistance element R1 via the normally open contacts 11a and 11a of the relay 9. That is, when the relay 9 is energized, the second resistance element R2 is connected in parallel to the first resistance element R1. When the relay 9 is energized, the common contact 9c of the relay 9 is connected from the normally closed contact 9b to the normally open contact 9a, and the input side of the rectifier 3 is connected to the one end connecting portion 8a and the intermediate connecting portion 8c of the current transformer 2. Connected to. The second resistance element R2 is configured such that when the rated current (6.6 A) is supplied to the primary winding 2a of the current transformer 2, the voltage across the first resistance element R1 (or the second resistance) The resistance value is set to, for example, 0.68Ω so that the voltage between both ends of the element R2 becomes larger than a reference voltage (for example, 0.34 V) of the comparison circuit 5 described later. The combined resistance of the first and second resistance elements R1, R2 is, for example, 0.58Ω.

  The voltage across the first resistor element R1 is amplified by the amplifier circuit 12. The amplifier circuit 12 includes an error amplifier 13, a resistor R3 connected to the non-inverting input terminal of the error amplifier 13, a resistor R4 connected between the inverting input terminal of the error amplifier 13 and the substrate ground E, and an error amplifier 13. The resistor R5 is connected between the inverting input terminal and the output terminal. The voltage across the first resistor element R1 is input to the error amplifier 13 via the resistor R3.

  The amplified voltage across the first resistance element R1 is input to an averaging circuit 14 including a resistor R7 and a capacitor C1 through a backflow preventing diode D1 and a current limiting resistor R6. Then, after being averaged to a constant voltage by the averaging circuit 14, it is input to the comparison circuit 5.

  The comparator circuit 5 includes a comparator 15, a resistor R 8 connected to the non-inverting input terminal of the comparator 15, a resistor R 9 connected to the inverting input terminal of the comparator 15, a non-inverting input terminal of the comparator 15, and A resistor R10 connected between the output terminals, and a series circuit of resistors R11 and R12 are formed. The comparator 15 operates by being supplied with the output voltage of the constant voltage circuit 7. Then, the voltage across the first resistor element R1 averaged to a constant voltage by the averaging circuit 14 is input to the non-inverting input terminal of the comparator 15 via the resistor R8. The output voltage of the constant voltage circuit 7 is divided by the resistors R11 and R12, and the voltage across the resistor R12 is input to the inverting input terminal of the comparator 15 via the resistor R9.

  The voltage across the resistor R12 is a reference voltage to be compared with the voltage across the first resistor element R1. This reference voltage is the first resistance element when a low-luminance current (for example, 70 mA) flows through the light-emitting diode 4 and the light-emitting diode 4 is lit at a predetermined luminous intensity ratio (a luminous intensity ratio of 10% of the rating). The voltage across R1 is set larger than, for example, 0.27 V (70 mA × 3.9Ω). Further, when a rated current (for example, 700 mA) flows through the light emitting diode 4 and the light emitting diode 4 is lit at a rated voltage, a voltage across the first resistor element R1, for example, 0.41 V (700 mA × 0.58Ω (first) And the combined resistance value of the second resistance elements R1 and R2)). That is, when the light emitting diode 4 is lit at a rated voltage, the voltage across the first resistor element R1 is set to be larger than the reference voltage.

  The current supplied to the primary winding 2a of the current transformer 2 when the light emitting diode 4 is in a predetermined luminous intensity ratio (a luminous intensity ratio of 10% of the rated value) or rated lighting is 4.8 A or 6.6 A, respectively. Therefore, for example, when the current of 6.0 A is supplied to the primary winding 2a of the current transformer 2, the reference voltage can be set. That is, when the input side of the rectifier 3 is connected to the one end connection portion 8a and the other end connection portion 8b of the current transformer 2, and the light emitting diode 4 is lit at a predetermined light intensity ratio (a light intensity ratio of 10% of the rating). When the current supplied to the primary winding 2a of the current transformer 2 increases from 4.8 A to 6.0 A, the current flowing through the light emitting diode 4 increases from 70 mA to 87.5 mA, and the first resistance element The voltage across R1 is 0.34 V (87.5 mA × 3.9Ω), and this voltage can be set as a reference voltage as a reference value.

  Then, the comparison circuit 5 compares the voltage across the first resistance element R1 with the reference voltage, and outputs a control signal to the connection circuit 6 according to the comparison result. That is, when the voltage between both ends of the first resistance element R1 is larger than the reference voltage (0.34V), a high signal (for example, DC5V) is output from the output terminal. Further, when the voltage between both ends of the first resistance element R1 is equal to or lower than the reference voltage (0.34V), a low signal is output from the output terminal.

  The connection circuit 6 includes a relay 9, an NPN bipolar transistor Q1, a base resistor R13, a noise preventing resistor R14, a surge absorbing diode D2, and the like. A series circuit of the relay coil 9d of the relay 9 and the bipolar transistor Q1 is connected between both ends of the capacitor C2 of the constant voltage circuit 7. The diode D2 is connected between both ends of the relay coil 9d. The output terminal of the comparator 15 of the comparison circuit 5 is connected to the base of the bipolar transistor Q1 via the base resistor R13. The resistor R14 is connected between the base and emitter of the bipolar transistor Q1, and the emitter of the bipolar transistor Q1 is connected to the substrate ground E.

  When a low signal is output from the comparison circuit 5, the bipolar transistor Q1 is turned off, and the relay coil 9d of the relay 9 is de-energized. That is, in the comparison circuit 5, when the voltage across the first resistance element R1 is equal to or lower than the reference voltage (0.34V), the control signal for outputting the relay 9 from the comparison circuit 5 is output. When the relay 9 is de-energized, the input side of the rectifier 3 and the one end connection portion 8a and the other end connection portion 8b of the current transformer 2 are closed (connected) by the common contact 9c and the normally closed contact 9b. The input side and the one end connection portion 8a and the intermediate connection portion 8c of the current transformer 2 are opened by the common contact 9c and the normally open contact 9a, and the first and second resistance elements R1 and R2 are connected in parallel by the normally open contact 11a. , 11a.

  When a high signal is output from the comparison circuit 5, the bipolar transistor Q1 is turned on, and the voltage across the capacitor C2 of the constant current circuit 7 is applied across the relay coil 9d of the relay 9, so that the relay coil 9d. Will be energized. That is, in the comparison circuit 5, when the voltage across the first resistance element R1 is larger than the reference voltage (0.34V), the control signal for energizing the relay 9 is output from the comparison circuit 5. When energized, the relay 9 opens the input side of the rectifying device 3 and the one end connection portion 8a and the other end connection portion 8b of the current transformer 2 by the common contact 9c and the normally closed contact 9b. The one end connection portion 8a and the intermediate connection portion 8c of the current transformer 2 are closed (connected) by the common contact 9c and the normally open contact 9a, and the first and second resistance elements R1 and R2 are connected in parallel to the normally open contact 11a. , 11a are closed (connected).

  The constant voltage circuit 7 includes a rectifier 16, a constant voltage integrated circuit 17, a capacitor C2, and a capacitor C3. The input side of the rectifier 16 is connected to one end connection 18a and the other end connection 18b provided at both ends of the tertiary winding 2c of the current transformer 2, respectively. A surge absorbing varistor VA2 is connected to the input side of the rectifier 16. A capacitor C2 is connected between the outputs of the rectifier 16 and a constant voltage integrated circuit 17 is further connected. A capacitor C3 is connected between the outputs of the constant voltage integrated circuit 17. The negative output side of the rectifier 16 is connected to the substrate ground E. The both ends of the capacitor C2 are connected to a series circuit of the relay coil 9d of the relay 9 of the connection circuit 6 and the bipolar transistor Q1. Further, both ends of the capacitor C3 are connected to a series circuit of the resistor R11 and the resistor R12 of the comparison circuit 5.

  The current flowing through the tertiary winding 2c of the current transformer 2 is rectified and smoothed by the rectifier 16 and the capacitor C2, and a predetermined DC voltage is generated across the capacitor C2. This DC voltage is applied to the relay coil 9d and energizes the relay 9 when a high signal is output from the comparison circuit 5 and the bipolar transistor Q1 of the connection circuit 6 is turned on. A constant voltage is generated across the capacitor C3 by the operation of the constant voltage integrated circuit 17. This constant voltage is divided by the resistors R11 and R12 of the comparison circuit 5, and the voltage across the resistor R12 (for example, 0.34V) is the reference voltage of the comparison circuit 5.

  Next, the operation of the first embodiment of the present invention will be described.

  As described above, when a relatively large rated current (for example, 6.6 A) is supplied from the AC constant current power source to the primary winding 2a of the current transformer 2, the LED marker lamp lighting device 1 is rated to the light emitting diode 4. Current (700 mA) flows, the light emitting diode 4 is lit at a rated level, and a relatively small predetermined current (for example, 4.8 A) is supplied to the primary winding 2a of the current transformer 2, the light intensity is reduced to the light emitting diode 4. Current (70 mA) flows, and the light emitting diode 4 is lit at a predetermined luminous intensity ratio (a luminous intensity ratio of 10% of the rated value). In practical use, a predetermined current (for example, 4.8 A) is supplied to the primary winding 2a of the current transformer 2. Further, at the time of periodic inspection, a rated current (for example, 6.6 A) is supplied to the primary winding 2a of the current transformer 2, and the light output of the light emitting diode 4 is inspected.

  Further, the LED marker lamp lighting device 1 is configured such that the relay 9 of the connection circuit 6 is de-energized in a state where no current is supplied to the primary winding 2 a of the current transformer 2, and the input side of the rectifier 3 is connected to the relay 9. The common contact 9c and the normally closed contact 9b are connected to the one end connection portion 8a and the other end connection portion 8b of the secondary winding 2b of the current transformer 2.

  When a predetermined current (4.8 A) is supplied to the primary winding 2 a of the current transformer 2, a low luminous intensity current (70 mA) flows through the light emitting diode 4, and the light emitting diode 4 has a predetermined luminous intensity ratio ( (Light intensity ratio of 10% of the rated value). Then, a current flowing through the light emitting diode 4 flows through the first resistance element R1, and a voltage of 0.27 V is generated between both ends. The voltage across the first resistor element R1 is amplified by the amplifier circuit 12, and is input to the comparator 15 of the comparator circuit 12, where it is compared with the reference voltage (0.34V).

  In the comparator 15, since the reference voltage is larger than the voltage across the first resistance element R 1, a low signal is output from the comparator 15 to the base of the bipolar transistor Q 1 of the connection circuit 6. Due to the low signal, the bipolar transistor Q1 is not turned on, and the relay 9 is kept inactive. Accordingly, the relay contacts 9a and 9b are not switched, and the input side of the rectifier 3 is continuously connected to the one end connection portion 8a and the other end connection portion 8b of the current transformer 2, and the light emitting diode 4 has a predetermined luminous intensity. Continue lighting at a ratio (luminance ratio of 10% of the rating). In the connection circuit 6, since the bipolar transistor Q1 is turned off and the relay 9 is turned off, the power consumption is very small.

  When the current supplied to the primary winding 2a of the current transformer 2 is increased, for example, from a predetermined current (4.8A) to a rated current (6.6A) during regular inspection, a current of 6A is supplied. 87.5 mA flows through the light emitting diode 4 and the voltage across the first resistor element R1 becomes 0.34V. When the current supplied to the primary winding 2a of the current transformer 2 becomes slightly larger than 6A, the voltage across the first resistance element R1 is larger than the reference voltage (0.34V) of the comparator 15. Become.

  The comparator 15 outputs a high signal to the base of the bipolar transistor Q1 of the connection circuit 6. In response to the high signal, the bipolar transistor Q1 is turned on, the voltage across the capacitor C2 of the constant voltage circuit 7 is applied to the relay coil 9d of the relay 9, and the relay 9 is energized. Thereby, the common contact 9c of the relay 9 is connected from the normally closed contact 9b to the normally open contact 9a, and the input side of the rectifier 3 is connected to the one end connection portion 8a and the intermediate connection portion 8b of the current transformer 2. Further, the normally open contacts 11a and 11a of the relay 9 are closed (connected), and the second resistance element R2 is connected in parallel to the first resistance element R1.

  A current of about 636 mA flows through the light emitting diode 4. Since the combined resistance value of the first and second resistance elements R1 and R2 is 0.58Ω, the voltage across the first resistance element R1 is 0.37V. Since this voltage is larger than the reference voltage (0.34V) of the comparator 15, a high signal is output from the comparator 15, the relay 9 of the connection circuit 6 is energized, and the relay contacts 9a, 9b of the relay 9 and The switching state of the relay contacts 11a, 11a is continued.

  When the rated current (6.6 A) is supplied to the primary winding 2 a of the current transformer 2, the rated current (700 mA) flows through the light emitting diode 4 so that the light emitting diode 4 is lit at a rated power. Then, an inspection of the light output from the light emitting diode 4 is performed.

  After the inspection, if the current supplied to the primary winding 2a of the current transformer 2 is reduced from the rated current (6.6 A), a current of 586 mA flows to the light emitting diode 4 at about 5.5 A, The voltage across the resistor element R1 is 0.34V. Since the voltage across the first resistance element R1 is equal to or lower than the reference voltage of the comparator 15, a low signal is output from the comparator 15 and the relay 9 of the connection circuit 6 is de-energized. Thereby, the input side of the rectifier 3 is connected to the one end connection portion 8a and the other end connection portion 8b of the current transformer 2, and the second resistance element R2 is not connected in parallel to the first resistance element R1.

  As described above, according to the comparison between the reference voltage and the voltage across the first resistance element R1 obtained by converting the current flowing through the light emitting diode 4 according to the current supplied to the primary winding 2a of the current transformer 2. Since the connection between the input side of the rectifier 3 and the secondary winding 2b of the current transformer 2 is automatically switched by the relay contacts 9a to 9c of the connection circuit 6, the input of the rectifier 3 during practical use and periodic inspection It is possible to prevent a connection error between the side and the secondary winding 2b of the current transformer 2, and to save labor.

  In practical use in which the input side of the rectifier 3 is connected to the one end connection portion 8a and the other end connection portion 8b of the current transformer 2 and the light emitting diode 4 is lit at a predetermined luminous intensity ratio, the relay 9 of the connection circuit 6 is used. Since the power consumption in the connection circuit 6 is very small, the power loss of the LED marker lamp lighting device 1 can be greatly reduced.

  Further, since the reference voltage of the comparison circuit 5 is supplied from the constant voltage circuit 7 formed on the output side of the tertiary winding 2c of the current transformer 2, it is necessary to provide a reference voltage source such as a battery. In addition, since it is not necessary to periodically replace the reference voltage source, the LED marker lamp lighting device 1 can be made inexpensive.

  At the time of periodic inspection, the rated current is supplied to the primary winding 2a of the current transformer 2, and when the light emitting diode 4 is rated-lit, the first and second resistance elements R1, R2 are connected in parallel, Since the resistance value of the current detection resistance element is relatively small, power loss in the first and second resistance elements R1 and R2 as the current detection resistance elements can be reduced, and the first The second resistance elements R1 and R2 can be used with low wattage and low cost.

  The first and second resistance elements R1 and R2 may be connected in series, and both ends of the second resistance element R2 may be short-circuited or opened at the relay contacts 11a and 11a. In this case, the combined resistance value of the first and second resistance elements R1 and R2 is, for example, 3.9Ω, and the resistance value of the first resistance element R1 may be, for example, 0.58Ω.

  Next, a second embodiment of the present invention will be described.

  FIG. 3 is a partially cutaway schematic side view of an LED marker lamp showing a second embodiment of the present invention. Note that the same parts as those in FIG.

  The LED marker lamp 19 shown in FIG. 3 includes the LED marker lamp lighting device 1 shown in FIG. 1 and a lamp body 20 in which the LED marker lamp lighting device 1 is disposed.

  The lamp body 20 is made of, for example, aluminum (Al), and a protruding portion 21 protruding inward is formed in a substantially cylindrical shape inside the one end portion 20a. A storage box 22 made of, for example, aluminum (Al) is disposed inside. In the storage box 22, the current transformer 2 and the lighting unit 23 are stored. The lighting unit 23 includes a circuit component obtained by removing the current transformer 2 and the light emitting diode 4 from the LED marker lamp lighting device 1.

  A base 25 having a cylindrical pedestal 24 at the center is fixed to the protruding portion 21 of the lamp body 20 by screws (not shown). A substrate 26 on which the light emitting diode 4 is mounted is fixed to the pedestal portion 24. The pedestal 24 is provided with a substantially cylindrical enclosure 27 so as to accommodate the light emitting diode 4. The enclosure 27 is made of, for example, an acrylic resin.

  A light-transmitting upper cover 28 having a shell shape and a predetermined thickness is attached to the end surface of the one end portion 20a of the lamp body 20 by an adhesive so as to cover the base 25 and the enclosure 27. It is fixed. The upper cover 28 is made of, for example, polycarbonate resin.

  A substantially cylindrical foldable joint 29, a part of which is inserted into the other end 20b, is attached to the other end 20b of the lamp body 20. The portion of the foldable joint 29 inserted into the other end portion 20 b of the lamp body 20 surrounds a part of the storage box 22. The foldable joint 29 is made of, for example, aluminum (Al). A lead wire (not shown) connected to the primary winding 2 a of the current transformer 2 is led out from one end portion 29 a of the foldable joint 29.

  For example, when a predetermined current (4.8 A) is supplied from the AC constant current power source to the current transformer 2 via the lead wire, the light emitting diode 4 is turned on at a predetermined luminous intensity ratio (a luminous intensity ratio of 10% of the rated value). . The emitted light emitted from the light emitting diode 4 passes through the upper cover 28 and is emitted outward.

  The LED indicator lamp 19 is connected to the input side of the rectifier 3 and one end of the current transformer 2 in accordance with a rated current (6.6 A) and a predetermined current (4.8 A) supplied from the AC constant current power source to the current transformer 2. Since the LED marker lamp lighting device 1 that automatically switches the connection to the part 8a, the other end connection part 8b, and the intermediate connection part 8c is provided, it is possible to save labor during practical use and periodic inspection.

1 is a schematic circuit diagram of an LED marker lamp lighting device showing a first embodiment of the present invention. Similarly, the characteristic figure which shows the change of the optical output with respect to an electric current. The partial notch schematic side view of the LED marker lamp which shows the 2nd Embodiment of this invention. The schematic circuit diagram of the LED marker lamp lighting device of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... LED indicator lamp lighting device 2 ... Current transformer 3 ... Rectifier 4 ... Light emitting diode 5 ... Comparison circuit 6 which comprises a current detection means ... Connection circuit 7 as a connection switching means ... Constant voltage circuit 19 ... LED indicator lamp 20 ... Lamp body R1 ... 1st resistance element R2 ... 2nd resistance element

Claims (4)

An insulated current transformer which is supplied with a current from an AC variable current source of variable output and has an output tap intermediate tap on the output winding;
A light-emitting diode that is lit when selectively supplied with current via the output winding or intermediate tap of the current transformer;
Current detection means for detecting a current flowing in the light emitting diode and outputting a control signal corresponding to the detected current value;
When the current from the AC constant current power source is relatively large, the current is supplied from the intermediate tap of the current transformer to the light emitting diode according to the control signal of the current detection means, and the current from the AC constant current power source is relatively small. Connection switching means for supplying current to the light emitting diode from the output winding of the current transformer in response to a control signal of the current detection means;
An LED marker lamp lighting device comprising:   The current detection means detects the current flowing through the light emitting diode by a resistance element, and when the current from the AC constant current power supply is relatively large, the resistance value of the resistance element is relatively reduced, and the current from the AC constant current power supply 2. The LED marker lamp lighting device according to claim 1, wherein the resistance value of the resistance element is relatively increased when the resistance is relatively small.   The current transformer has an auxiliary winding insulated from the output winding, and a constant voltage circuit formed by rectifying and smoothing the current flowing through the auxiliary winding is formed between both ends of the auxiliary winding. 3. The LED marker lamp lighting device according to claim 1, wherein the output voltage of the circuit is a reference value to be compared with the current value detected by the current detecting means. An LED marker lamp lighting device according to any one of claims 1 to 3;
A lamp body provided with this LED marker lamp lighting device;
The LED marker lamp characterized by comprising.

Images