LED Lighting Device

Abstract

To solve the problem that, in the state where the erroneous wiring of the error 5 shown in Fig. 3, has occurred with the charging medium 34 not charged with sufficient power, the installer is incapable of recognizing the occurrence of erroneous wiring of the error 5 because the emergency LED 37 does not light up if the charging medium 34 is in short of electric charge despite the emergency LED 37 is supposed to turn on as no power is supplied to the emergency circuit part 3 on the same basis as when a power failure occurs, although the LED23 for lighting appears to operate normally as the LED23 for lighting turns on and off in response to on / off operation of an on / off switch 11.SOLUTION: A lighting inhibition circuit 4 is provided so as to forcibly stop operation of an IC5 so that an LED23 for lighting does not light up when power is supplied to a bridge 41.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an LED lighting device that is connected to an external AC power supply and includes two systems of LEDs, namely a lighting LED and an emergency LED. When a power outage occurs, the emergency LED can be lit by the power stored in a built-in charging medium.

Background Art

[0002] In an LED lighting device that lights an LED with power from an external AC power supply, power is charged to a charging medium with the power supplied from the AC power supply. When a power outage occurs, the emergency LED is configured to be lit by the power stored in the charging medium. Such an LED lighting device is known.

[0003] In such an LED lighting device, since it is necessary to detect the occurrence of a power outage, in addition to the lighting LED that is turned on and off by a lighting switch, power supply is constantly provided to charge the charging medium without passing through the lighting switch. When the charging of the charging medium stops, the occurrence of a power outage is detected. Therefore, in addition to the two lines provided with a lighting switch on one line of the external commercial power supply, it is necessary to wire another line that bypasses the lighting switch, and a total of three lines are connected to the LED lighting device (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] For an LED lighting device that does not have the function of lighting the emergency LED when a power outage occurs as described above, only two lines need to be connected to the LED lighting device. Also, regardless of which line is provided with the on / off switch, the lighting LED can be turned on and off, so the problem of incorrect wiring does not occur. However, in the case of an LED lighting device connected to an external AC power supply via three lines as described above, the problem of incorrect wiring of these three lines occurs. At the site where the LED lighting device is installed, after the wiring work is carried out, the on / off switch is turned on and off to check whether it operates normally. However, there is a possibility that incorrect wiring that cannot be identified may occur during such a check.

[0006] Referring to FIG. 3, 1 is an LED lighting device. AC power is supplied to this LED lighting device 1 from an external AC power supply PS. For the two power supply lines from the AC power supply PS, for the sake of convenience, they are labeled as “+” and “-” for distinction. Also, for the line connected from AC+ which is one of the lines through the on / off switch 11, when the wiring is normal, AC+ is connected to terminal 1, SW is connected to terminal 2, and AC- is connected to terminal 3.

[0007] On the other hand, inside the LED lighting device 1, there are provided a lighting circuit section 2 in which the lighting LED 23 is turned on and off by operating the on / off switch 11, and an emergency circuit section 3 for continuously lighting the emergency LED 37 when the power supply from the AC power supply PS stops due to the occurrence of a power outage or the like.

[0008] The lighting circuit section 2 is connected to terminal 2 and terminal 3. When the on / off switch 11 is turned on, AC power is supplied to the lighting circuit section 2, and when the on / off switch 11 is turned off, the power supply to the lighting circuit section 2 stops. The AC power supplied to this lighting circuit section 2 is full-wave rectified by a diode bridge (hereinafter simply referred to as a bridge) 21 and converted into DC power of a predetermined voltage by an AC / DC converter 22, and then supplied to the lighting LED 23.

[0009] On one hand, terminal 1 and terminal 3 are connected to the emergency circuit section 3, and AC power from the AC power supply PS is always supplied regardless of the on / off state of the lighting switch 11. The supplied AC power is converted into DC power of a predetermined voltage by the bridge 31 and the AC / DC converter 32, and then converted into a voltage and current for charging the charging medium 34 by the DC / DC converter 33 to charge this charging medium 34. When the charging of the charging medium 34 stops due to a power outage or the like, the power outage detection circuit 35 detects the stop of charging and lights the emergency LED 37 with the power charged in the charging medium 34.

[0010] The charging medium 34 may use a rechargeable secondary battery, or an electric double layer capacitor with excellent maintainability may be used. However, considering that a large amount of power is consumed to rapidly charge the charging medium 34 and the frequency of power outages is not very high, the DC / DC converter 33 is set to charge the charging medium 34 with a small amount of power that requires at least several hours until the power charged in the charging medium 34 reaches a sufficient amount to light the emergency LED 37 from a state where the power is zero. Therefore, immediately after the LED lighting device 1 is installed, since the charging medium 34 is not fully charged, the emergency LED 37 may not light even if a power outage occurs.

[0011] In the above configuration, it is sufficient that the three lines from the AC power supply PS are correctly wired. However, if a miswiring occurs, it is necessary for the construction worker to quickly recognize the miswiring and correct it to the correct wiring.

[0012] As described in the table shown at the upper part of FIG. 3, five patterns from mis 1 to mis 5 can be considered as miswiring patterns.

[0013] In the case of mis 1, AC+ and SW are wired to the lighting circuit section 2. However, since AC+ and SW are at the same potential, no power is supplied, and the lighting LED 23 does not light even if the lighting switch 11 is turned on and off. Therefore, it can be immediately recognized that it is a miswiring.

[0014] If it is Wiring Error 2, AC+ and AC- are wired to the lighting circuit section 2, and the lighting LED 23 lights up. However, even if the on / off switch 11 is turned off, the lighting LED 23 does not turn off. Therefore, it can be immediately recognized that there is a wiring error.

[0015] If it is Wiring Error 3, similar to Wiring Error 1, even if the on / off switch 11 is operated to turn on and off, the lighting LED 23 does not light up. Therefore, it can be immediately recognized that there is a wiring error.

[0016] If it is Wiring Error 4, similar to Wiring Error 2, even if the on / off switch 11 is turned off, the lighting LED 23 continues to light up. Therefore, it can be immediately recognized that there is a wiring error.

[0017] If it is Wiring Error 5, since power is supplied to the lighting circuit section 2 via the on / off switch 11, the lighting LED 23 turns on and off in response to the on / off operation of the on / off switch 11. Therefore, the lighting LED 23 appears to operate normally. However, power is not supplied to the emergency circuit section 3, and it is in the same state as when a power outage occurs. Therefore, the emergency LED 37, which should not normally light up, should light up. However, since it takes several hours for the charging medium 34 to be fully charged as described above, there may be a case where the emergency LED 37 does not light up even if the power outage detection circuit 35 detects the occurrence of a power outage immediately after the LED lighting device 1 is installed. In that case, there is a problem that the construction contractor cannot recognize the occurrence of a wiring error.

[0018] Therefore, in view of the above problems, an object of the present invention is to provide an LED lighting device that can surely recognize the occurrence of a wiring error during construction even in an LED lighting device that receives power supply from an AC power source via three lines.

Means for Solving the Problems

[0019] To solve the above problems, the LED lighting device according to the present invention includes a charging medium that is constantly charged with power supplied from an external AC power source. When the charging power to this charging medium disappears, it is an LED lighting device equipped with an emergency LED that is lit with the power charged in the charging medium, and a lighting LED that is lit by the power supplied from the external AC power source via a lighting switch. Among the three lines, namely, two lines connected to both poles of the AC power source and one line branched from one of these two lines via the lighting switch, when the other line of the two lines connected to both poles of the AC power source and the line branched from the one line via the lighting switch are connected in reverse to each other, lighting prohibition means is provided to prohibit the lighting of the lighting LED regardless of the on / off state of the lighting switch.

[0020] When the miswiring shown as error 5 in FIG. 2 above occurs, that is, when the other line of the two lines connected to both poles of the AC power source and the line branched from the one line via the lighting switch are connected in reverse to each other, the lighting prohibition means prohibits the lighting of the lighting LED regardless of the on / off state of the lighting switch, so that the occurrence of miswiring can be recognized.

[0021] Specifically, in a normally wired state, the charging medium for lighting the emergency LED is connected via a diode bridge to the line among the one line that does not pass through the lighting switch and the other line, and the power for lighting the lighting LED is via a diode bridge to the Dot cancellationIt is connected to one line via a lamp switch and the other line, and the lighting prohibition means is connected to both sides of the one line via a diode bridge. As this lighting prohibition means, an electrolytic capacitor is connected to the output side of the diode bridge, and a lighting prohibition circuit is provided that does not operate at the effective voltage when the voltage of this electrolytic capacitor is half-wave rectified and operates at the effective voltage when it is full-wave rectified. When this lighting prohibition circuit operates, it can be configured to stop the power supply for lighting to the lighting LED.

[0022] More specifically, lighting power is supplied to the lighting LED via an AC / DC converter having an enable terminal (EN terminal) that operates when an operation signal is input thereto. When the lighting prohibition circuit operates, the input of the operation signal to the enable terminal is stopped and the operation of the AC / DC converter is stopped, thereby stopping the power supply for lighting to the lighting LED.

Advantages of the Invention

[0023] As is clear from the above description, the present invention can surely make the installer recognize the occurrence of miswiring even immediately after the installation of the LED lighting device when there is not enough power charged in the charging medium to light the emergency LED.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0025] Referring to FIG. 1, the configurations denoted by the same reference numerals as in FIG. 3 are the same as those shown in FIG. 3, and thus the description thereof will be omitted.

[0026] The feature of the LED lighting device 1 according to the present invention lies in providing a lighting prohibition circuit 4 as a lighting prohibition means. This lighting prohibition circuit 4 is for recognizing the error 5 shown in FIG. 3 described above.

[0027] This lighting prohibition circuit 4 is connected to terminal 1 and terminal 2. Therefore, if the wiring is normal, the voltage of the commercial power supply PS will not be applied to the lighting prohibition circuit 4. However, the bridge 41 of the lighting prohibition circuit 4 will be connected to terminal 1 and terminal 3 via the bridge 21 of the lighting circuit section 2, and will perform half-wave rectification and charge the electrolytic capacitor 42 with the rectified power. Similarly, the bridge 21 also performs half-wave rectification and charges the capacitor 24. Therefore, a diode 44 is provided so that only the voltage divided by the capacitor 24, capacitor 42, and resistor 43 is applied across the capacitor 24, preventing the lighting LED 23 from lighting unintentionally even when the lighting and extinguishing switch 11 is off.

[0028] A zener diode 45 and an LED 46 constituting a photocoupler are connected in series to the capacitor 42 in the lighting prohibition circuit 4. When the bridge 41 is performing half-wave rectification, the effective voltage charged in the capacitor 42 is 1 / 2 of the maximum value of the commercial power supply PS, that is, about 70 volts. On the other hand, when the bridge 41 is performing full-wave rectification, the effective voltage of the capacitor 42 becomes 100 volts. Therefore, a zener diode 45 that does not turn on at 70 volts of the capacitor 42 but turns on at 100 volts is selected. As a result, the LED 46 does not emit light when the bridge 41 is performing half-wave rectification, but the LED 46 emits light when the bridge 41 is performing full-wave rectification.

[0029] When LED46 emits light, the phototransistor 47 turns on, pulling down the enable terminal (EN terminal) 51 of the IC5 included in the AC / DC converter 22 of the lighting circuit section 2 to Lo. The IC5 adopted in this embodiment internally holds the enable terminal 51 at Hi. If the phototransistor 47 does not turn on, the enable terminal 51 remains in the Hi state and the IC5 continues to operate. However, when the phototransistor 47 turns on and pulls down the enable terminal 51 to Lo, the IC5 stops operating and power is no longer supplied to the lighting LED 23, and the lighting LED 23 does not light up.

[0030] That is, if the voltage of the commercial power supply PS is applied to the bridge 41, the IC5 stops operating, and if the voltage of the commercial power supply PS is not applied, the operation of the IC5 is not forcibly stopped.

[0031] Based on the above, with reference to FIG. 2, the identification of the wiring error patterns in the circuit shown in FIG. 1 will be described.

[0032] If the wiring is normal, regardless of the on / off state of the lighting switch 11, the bridge 41 is in a half-wave rectification state. Therefore, the operation of the IC5 is not forcibly stopped. Accordingly, the lighting LED 23 lights up and goes out depending on the on / off of the lighting switch 11, and the charging medium 34 is always charged.

[0033] In error 1, power is not supplied to the lighting circuit section 2, and the operation of the IC5 is forcibly stopped regardless of the on / off of the lighting switch 11. Therefore, the lighting LED 23 does not light up.

[0034] In error 2, power is constantly supplied to the lighting circuit section 2, but when the lighting switch 11 is turned on, the operation of the IC5 stops and the lighting LED 23 goes out.

[0035] In error 3, power is not supplied to the lighting circuit section 2, so the lighting LED 23 does not light up.

[0036] In error 4, power is constantly supplied to the lighting circuit section 2, and the lighting LED 23 lights up, but it does not turn off even when the lighting switch 11 is turned off.

[0037] And in error 5, regardless of whether the lighting switch 11 is on or off, the operation of the IC 5 is forcibly stopped, so the lighting LED 23 does not light up, and it is possible to detect that there is a wiring error.

[0038] Note that the present invention is not limited to the above-described form, and various modifications may be made without departing from the gist of the present invention.

Explanation of Reference Numerals

[0039] 1 Lighting device 2 Lighting circuit section 3 Emergency circuit section 4 Clinic circuit 11 Lighting switch 23 Lighting LED 37 Emergency LED

Claims

1. An LED lighting device comprising a charging medium that is constantly charged by power supplied from an external AC power source, an emergency LED that is lit by the power charged in the charging medium when the charging power to the charging medium disappears, and a lighting LED that is lit by power supplied from the external AC power source via a lighting switch. The device has two lines connected to both poles of the AC power source, and a total of three lines including one line branched from one of these two lines via the lighting switch. When the other line of the two lines connected to both poles of the AC power source and the line branched from the one line via the lighting switch are connected in reverse to each other, a lighting prohibition means is provided to prohibit the lighting of the lighting LED regardless of the on / off state of the lighting switch.

2. In a normally wired state, the charging medium for lighting the emergency LED is connected to the line of the one line that does not pass through the lighting switch and the other line via a diode bridge. The power for lighting the lighting LED is connected to the line passing through the lighting switch and the other line via a diode bridge. The lighting prohibition means is connected to both sides of the one line via a diode bridge. As this lighting prohibition means, an electrolytic capacitor is connected to the output side of the diode bridge, and a lighting prohibition circuit is provided that does not operate at the effective voltage when the voltage of this electrolytic capacitor is half-wave rectified and operates at the effective voltage when it is full-wave rectified. When this lighting prohibition circuit operates, the power supply for lighting the lighting LED is stopped. The LED lighting device according to claim 1, characterized in that.

3. The lighting power is supplied to the lighting LED via an AC / DC converter having an enable terminal (EN terminal) that operates when an operation signal is input. When the lighting prohibition circuit operates, the operation of the AC / DC converter is stopped by stopping the input of the operation signal to the enable terminal, thereby stopping the power supply for lighting the lighting LED. The LED lighting device according to claim 2, characterized in that.

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