LED Lighting Device

Abstract

To solve the following problem: in such a state that erroneous wiring shown in an Error 5 of Fig. 3 is generated and a sufficient amount of electric power is not charged in a charging medium 34, a LED 23 for illumination turns on and off correspondingly with on-off operations of an on / off switch 11, therefor the LED 23 for illumination externally operates normally; however, just with occurrence of power failure, no electric power is supplied to a circuit part 3 for emergency; therefor, a LED 37 for emergency should turn on; however, the LED 37 for emergency does not turn on because of insufficient charges in the charging medium 34; however, in that case, a contractor cannot recognize the generation of the erroneous wiring of the Error 5.SOLUTION: A lighting prohibition circuit 4 is configured so that an enable terminal 51 is switched to Lo to stop an operation of an AC / DC converter and to prohibit an LED 23 for illumination from turning on when electric power from an AC power supply is supplied between a terminal 1 and a terminal 2.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 is lit by the power charged 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 in a charging medium with the power supplied from the AC power supply. When a power outage occurs, the emergency LED is lit by the power charged in the charging medium. An LED lighting device configured as such 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 performed 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] In the case of 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 sake of convenience, the two power supply lines from the AC power supply PS are labeled with “+” and “-” for distinction. Also, when the line connected via the on / off switch 11 from AC +, which is one of the lines, is designated as SW, 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, converted into DC power of a predetermined voltage by an AC / DC converter 22, and 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 power that requires at least several hours until the power charged in the charging medium 34 reaches a sufficient power to light the emergency LED 37 from a state where the power is zero. Therefore, immediately after installing the LED lighting device 1, the charging medium 34 may not be fully charged, and in such a state where the charging power is insufficient, the emergency LED 37 may not light even when a power outage occurs.

[0011] In the above configuration, it is sufficient that three lines from the AC power supply PS are normally wired to each terminal. However, when a miswiring occurs, it is necessary for the construction worker to quickly recognize the miswiring and correct it to the normal 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 the 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 when the lighting switch 11 is turned on and off. Therefore, it can be immediately recognized that it is a miswiring.

[0014] In the case of 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 miswiring.

[0015] In the case of Error 3, similar to Error 1, even if the on / off switch 11 is turned on and off, the lighting LED 23 does not light up, so it can be immediately recognized that there is a miswiring.

[0016] In the case of Error 4, similar to Error 2, even if the on / off switch 11 is turned off, the lighting LED 23 continues to light up, so it can be immediately recognized that there is a miswiring.

[0017] In the case of 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, so 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, so the emergency LED 37 that should not normally light up should light up. However, if the charging medium 34 is not sufficiently charged as described above, it takes several hours to be charged. Therefore, immediately after the LED lighting device 1 is installed, 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. In that case, there is a problem that the installer cannot recognize the occurrence of miswiring.

[0018] Therefore, in view of the above problems, the present invention is an LED lighting device provided with terminals to which three lines from an AC power supply are connected, and an object thereof is to provide an LED lighting device that can surely recognize the occurrence of miswiring when miswiring occurs in each terminal during installation.

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, an emergency LED that is lit with the power stored 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 lines of each of the two poles of the AC power source, a terminal 1 to which one line is connected, a terminal 2 to which a line via the lighting switch is connected from this one line, and a terminal 3 to which the other line of each of the two poles of the AC power source is connected. The charging medium is connected to terminal 1 and terminal 3, and the lighting LED is connected to terminal 2 and terminal 3. In this case, A that supplies lighting power to the lighting LED C The AC / DC converter has an enable terminal (EN terminal). When power from the AC power source is supplied between terminal 1 and terminal 2, the signal to this enable terminal is cut off to stop the operation of the AC / DC converter so that the lighting LED does not light up.

[0020] When properly wired, no power from the AC power source is supplied between terminal 1 and terminal 2. If power from the AC power source is supplied between these terminal 1 and terminal 2 due to incorrect wiring, the lighting LED is configured not to light up to detect the occurrence of incorrect wiring.

[0021] As a specific configuration for stopping the operation of the AC / DC converter, an LED constituting a photocoupler is connected between terminal 1 and terminal 2, and a capacitor that is charged when the phototransistor constituting this photocoupler is turned on is provided. A switching element that is turned on when the charging voltage of this capacitor reaches a predetermined voltage is provided, and when this switching element is turned on, the enable terminal is set to Lo to stop the operation of the AC / DC converter.

[0022] Note that the power for charging the capacitor may be generated by a power supply circuit connected to the terminal 2.

Advantages of the Invention

[0023] As is clear from the above description, the present invention relates to an LED lighting device having three terminals to which wiring from an external commercial power supply is connected, and can identify incorrect wiring immediately after construction and can immediately correct the incorrect wiring.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

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

[0026] The feature of the LED lighting device 1 according to the present invention is that, among a plurality of incorrect wiring patterns, when power from an AC power supply PS is supplied between terminal 1 and terminal 2, a lighting prohibition circuit 4 is provided to lower the enable terminal 51 to Lo to stop the operation of the AC / DC converter 22 so that the lighting LED 23 does not light.

[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, when AC power from the commercial power supply PS is applied between terminal 1 and terminal 2, the LED 41, which is a component of the photocoupler, will blink at the frequency of the AC power supply. The phototransistor 42 paired with this LED 41 will turn on each time LED 41 emits light. Thus, the capacitor 43 will be intermittently charged at the frequency of the AC power supply, and the charging potential will increase step by step. When the charging potential of this capacitor 43 rises to a predetermined potential, the transistor 44 will turn on, and the enable terminal 51 will be pulled down to Lo. In this embodiment, the IC 5 in the AC / DC converter 22 is configured to pull up the enable terminal 51 to Hi internally. When the enable terminal 51 is not pulled down to Lo, it is pulled up to Hi internally, and the IC 5 operates, allowing the AC / DC converter 22 to supply power to the lighting LED 23. However, as described above, when the enable terminal 51 is pulled down to Lo, the LC 5 stops operating, and the AD / DC converter 22 can no longer supply power to the lighting LED 23. As a result, the lighting LED 23 does not light up. Note that the operating power HV10 of this lighting prohibition circuit 4 is configured to be generated by the power supply circuit 6 using the power supplied from terminal 2.

[0028] This power supply circuit 6 incorporates a Zener diode 61. The capacitor 62 is charged at a predetermined breakdown voltage, and that breakdown voltage is output from the power supply circuit 6 as HV10.

[0029] With the above configuration, referring to FIG. 2, when the three terminals 1 to 3 are normally wired as shown, with the lighting switch 11 off, the power supply circuit 6 does not operate, and the lighting prohibition circuit 4 does not operate. Also, when the lighting switch 11 is turned on, the power supply 6 operates, but terminal 1 and terminal 2 are at the same potential, and the LED 41 of the photocoupler does not light up. Therefore, the lighting prohibition circuit 4 does not operate. As a result, it can be confirmed that the lighting LED 23 lights up and goes off according to the on / off state of the lighting switch 11 and that the wiring is normal.

[0030] Next, if the miswiring shown as error 1 occurs, regardless of the on / off state of the on / off switch 11, the power supply circuit 6 operates and the enable terminal 51 drops to Lo. Therefore, the lighting LED 23 remains turned off, and the occurrence of miswiring can be confirmed.

[0031] Next, if the miswiring shown as error 2 occurs, when the on / off switch 11 is in the off state, AC power is supplied to the lighting circuit section 2 and the lighting LED 23 lights up. However, when the on / off switch 11 is turned on, the lighting prohibition circuit 4 operates to turn off the lighting LED 23. That is, since the on / off state of the on / off switch 11 and the on / off state of the lighting LED 23 are reversed, the occurrence of miswiring can be confirmed.

[0032] Next, if the miswiring shown as error 3 occurs, AC power is not supplied to the lighting circuit section 2 regardless of the on / off state of the on / off switch 11. Therefore, the lighting LED 23 does not light up, and the occurrence of miswiring can be confirmed.

[0033] Next, if the miswiring shown as error 4 occurs, AC power is always supplied to the lighting circuit section 2. And since the LED 41 does not light up regardless of the on / off state of the on / off switch 11, the enable terminal 51 does not drop to Lo. Therefore, the lighting LED 23 continues to light up regardless of whether the on / off switch 11 is turned on or off, and the occurrence of miswiring can be confirmed.

[0034] Finally, if the miswiring shown as error 5 occurs, since AC power is supplied to terminal 1 and terminal 2, the enable terminal 51 is dropped to Lo, and the lighting LED 23 remains turned off regardless of the on / off state of the on / off switch 11, and the occurrence of miswiring can be confirmed.

[0035] In this way, with the above configuration, it is possible to distinguish between the occurrence of all miswirings and the case where the wiring is performed normally, and it is possible to confirm the occurrence of miswiring on-site where the lighting fixture is installed, and it is possible to prevent the occurrence of miswiring.

[0036] Note that the present invention is not limited to the above-described forms, and various modifications may be made without departing from the gist of the present invention.

Explanation of Reference Numerals

[0037] 1 Lighting device 2 Lighting circuit section 3 Emergency circuit section 4 Lighting prohibition circuit 11 Lighting on / off switch 23 Lighting LED 37 Emergency LED 51 Enable terminal

Claims

1. An LED lighting device comprising a charging medium that is constantly charged with power supplied from an external AC power source, an emergency LED that is lit with the power stored 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. Among the lines of each of the two poles of the AC power source, there are a terminal 1 to which one line is connected, a terminal 2 to which a line via the lighting switch is connected from this one line, and a terminal 3 to which the other line of each of the two poles of the AC power source is connected. The charging medium is connected to terminal 1 and terminal 3, and the lighting LED is connected to terminal 2 and terminal 3. The AC / DC converter that supplies power for lighting to the lighting LED has an enable terminal (EN terminal). When power from the AC power source is supplied between terminal 1 and terminal 2, the signal to this enable terminal is blocked to stop the operation of the AC / DC converter so that the lighting LED does not light. The LED lighting device is characterized by this.

2. An LED is connected between terminal 1 and terminal 2 to form a photocoupler, a capacitor that is charged when the phototransistor that forms this photocoupler is turned on is provided, and a switching element that is turned on when the charging voltage of this capacitor reaches a predetermined voltage is provided. When this switching element is turned on, the enable terminal is set to Lo to stop the operation of the AC / DC converter. The LED lighting device according to claim 1 is characterized by this.

3. The power for charging the capacitor is generated by a power supply circuit connected to terminal 2. The LED lighting device according to claim 2 is characterized by this.

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