LED Lighting Device

Abstract

To solve a problem in which, in a state in which erroneous wiring shown in erroneous 5 in FIG. 2 occurs and a charging medium 34 is not charged with sufficient power, a lighting LED 23 turns on and off in response to the on / off operation for the on / off switch 11, such that the lighting LED 23 works normally at first glance, in such a case an emergency LED 37 which originally does not light should light, but the emergency LED 37 does not light even when a power failure detection circuit 35 detects the occurrence of a power failure, and in that case, a contractor cannot recognize the occurrence of erroneous wiring.SOLUTION: An LED lighting device includes blinking means that outputs a blinking signal to an AC / DC converter for an LED for lighting, and intermittently operates the AC / DC converter to blink the LED for lighting, and signal blocking means that blocks the input of the blinking signal to the AC / DC converter when a charging medium is charged.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, and has a function of lighting the emergency LED with the power charged during a power outage.

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, and when a power outage occurs, the emergency LED is lit with 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, and when the charging of the charging medium stops, the occurrence of a power outage is detected. Therefore, in addition to the two lines in which a lighting switch is provided in one line, 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 connection of these three lines occurs. After wiring work is carried out at the site where the LED lighting device is installed, the on / off switch is turned on and off to check if 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. 2, 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 convenience, they are distinguished by attaching "+" and "-". Also, the line connected from AC+, which is one of the lines, via the on / off switch 11 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 turns 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 rectified by the bridge 21 and converted into DC power of a predetermined voltage by the 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 the 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 power saving such that it takes at least several hours to charge sufficient power to light the emergency LED 37 from the state where the power charged in the charging medium 34 is zero. Therefore, immediately after installing the LED lighting device 1, 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 wiring error occurs, it is necessary for the construction worker to quickly recognize the wiring error and correct it to the correct wiring.

[0012] As described in the table shown at the upper part of FIG. 2, five patterns from error 1 to error 5 can be considered as the wiring error patterns.

[0013] In the case of error 1, AC+ and SW are wired to the lighting circuit section 2. 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 wiring error.

[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 operated to turn 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. Therefore, the emergency LED 37 that 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 worker cannot recognize the occurrence of miswiring.

[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 miswiring 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, 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. In an LED lighting device having a total of 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, an AC / DC converter for lighting the lighting LED is provided, and a blinking signal is output to this AC / DC converter, and the AC / DC converter Put Blinking means for intermittently operating to blink the lighting LED, and signal blocking means for blocking the input of the blinking signal to the AC / DC converter when the charging medium is charged.

[0020] When the miswiring of error 5 shown in FIG. 2 above occurs, even if the charging medium is not charged, the signal blocking means cannot block the input of the blinking signal from the blinking means to the AC / DC converter that lights the lighting LED. Therefore, even when the lighting switch is turned on, the lighting LED does not light continuously but blinks. Even if the emergency LED does not light, the installer can recognize the occurrence of miswiring due to the blinking of this lighting LED.

[0021] The blinking means may be operated regardless of the on / off state of the lighting switch. However, the power supply to the blinking means is preferably configured to be branched from the power supply line to the AC / DC converter that lights the lighting LED and supplied so that it operates in conjunction with the AC / DC converter for lighting.

[0022] Note that the charging medium is composed of an electric double layer capacitor, and it is desirable to set it so that sufficient power to light the emergency LED is charged from a state where the charging power is zero. into this electric double layer capacitor Charged.

Effect of the Invention

[0023] As is apparent from the above description, the present invention can surely make a construction worker recognize the occurrence of a wiring error even immediately after the installation of the LED lighting device when the charging medium is not charged with sufficient power to light the emergency LED.

Brief Description of the Drawings

[0024]

Figure 1

Figure 2

Embodiments for Carrying Out the Invention

[0025] Referring to FIG. 1, since the configurations denoted by the same reference numerals as those in FIG. 2 above are the same as those shown in FIG. 2, the description thereof will be omitted for simplicity.

[0026] The feature of the LED lighting device 1 according to the present invention lies in providing the blinking circuit section 4. This blinking circuit section 4 is for recognizing the error 5 shown in FIG. 2 above. Regarding errors 1 to 4, as described above, since the construction worker can recognize each wiring error, duplicate descriptions will be omitted.

[0027] This blinking circuit section 4 is operated by the power branched from the power supply line to the lighting circuit section 2. Therefore, the blinking circuit section 4 is configured to always operate when the lighting circuit section 2 is operating. The blinking circuit section 4 is provided with a PWM generation circuit 43. When power is supplied to the blinking circuit section 4, this PWM generation circuit 43 operates to output a pulse signal of a predetermined frequency. Since the frequency of this pulse signal needs to be visually recognizable, it is set to about several tens of Hz. And the pulse signal output from this PWM generation circuit 43 is configured to be input to the gate of a field effect transistor (hereinafter referred to as FET) 44.

[0028] Furthermore, in the emergency circuit section 3, an LED 41, which is a component of a photocoupler, is newly provided between the AC / DC converter 32 and the DC / DC converter 33. The phototransistor 42 paired with this LED 41 is provided between the gate of the FET 44 in the blinking circuit section 4 and the ground. Therefore, when the emergency circuit section 3 is operating normally, the LED 41 emits light and the phototransistor is turned on, dropping the gate of the FET 44 to the ground. Thus, even if a pulse signal is output from the PWM generation circuit 43, the FET 44 continues to hold the off state.

[0029] Also, the AC / DC converter 22 in the lighting circuit section 2 incorporates a voltage conversion IC 5. This IC is provided with an NTC terminal 51. If this NTC terminal 51 is in the Hi state, the AC / DC converter 22 operates to turn on the lighting LED 23. However, when the NTC terminal 51 goes Low, the IC 5 stops operating and the lighting LED 23 is turned off.

[0030] With the above configuration, if the three lines from the AC power supply PS are properly wired, turning on the on / off switch 11 lights the lighting LED 23, and turning off the on / off switch 11 turns off the lighting LED 23. The emergency LED 37 remains off.

[0031] However, if the miswiring shown in the above mistake 5 occurs and the on / off switch 11 is turned on while the charging medium 34 is not fully charged, although the emergency LED 37 does not light, the LED 41 does not light, so the phototransistor 42 turns off, and the FET 44 repeatedly turns on and off in response to the pulse signal output from the PWM generation circuit. Each time the FET 44 turns on, the NTC terminal 51 is dropped to Low, turning off the lighting LED 23. As a result, it can be visually recognized that the lighting LED 23 is blinking and the miswiring of mistake 5 has occurred.

[0032] 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

[0033] 1 Lighting device 2 Lighting circuit section 3 Emergency circuit section 4 Flashing circuit section 11 Extinguishing switch 23 Lighting LED 37 Emergency LED

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. In a configuration where a total of 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, are connected, the device is provided with an AC / DC converter for lighting the lighting LED, and a flashing means that outputs a flashing signal to the AC / DC converter and intermittently operates the AC / DC converter to flash the lighting LED. A signal blocking means is provided to block the input of the flashing signal to the AC / DC converter when the charging medium is in a charged state.

2. The LED lighting device according to claim 1, wherein the power supply to the flashing means is branched from the power supply line to the AC / DC converter for lighting the lighting LED.

3. The LED lighting device according to claim 1 or claim 2, wherein the charging medium is composed of an electric double layer capacitor, and is set such that the electric double layer capacitor is charged with sufficient power to light the emergency LED from a state where the charging power is zero.

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