JP7713282B2 - LED lighting equipment - Google Patents

Description

The present invention relates to an LED lighting device that is connected to an external AC power source, has two systems of LEDs, an illumination LED and an emergency LED, and has the function of lighting the emergency LED using the power stored in the built-in charging medium in the event of a power outage.

In an LED lighting device that uses power from an external AC power source to light up the LEDs, a charging medium is charged with power supplied from the AC power source, and in the event of a power outage, an LED lighting device is known that is configured to light up the emergency LEDs using the power stored in the charging medium.

Since such LED lighting devices need to detect the occurrence of power outages, in addition to the lighting LEDs that are turned on and off by a light on/off switch, they also constantly supply power to charge the charging medium without going through a light on/off switch, and detect the occurrence of a power outage when charging of the charging medium stops. Therefore, in addition to the two lines with the light on/off switch on one line of the external commercial power supply, the LED lighting device needs to be wired with another line that bypasses the light on/off switch, meaning that a total of three lines are connected to the LED lighting device (see, for example, Patent Document 1).

JP 2018-195470 A (FIGS. 4 and 5)

For an LED lighting device that does not have the function of turning on the emergency LED in the event of a power outage as described above, it is sufficient to connect two lines to the LED lighting device, and the lighting LED can be turned on and off regardless of which line is provided with an on/off switch, so there is no problem with incorrect wiring. However, with an LED lighting device that is connected to an external AC power source via three lines as described above, there is a problem with incorrect wiring of these three lines. At the site where the LED lighting device is installed, the on/off switch is turned on and off to check whether it is operating normally after wiring work is completed, but there is a risk of incorrect wiring occurring that cannot be identified by such a check.

Referring to FIG. 3, 1 is an LED lighting device. This LED lighting device 1 is supplied with AC power from an external AC power source PS. For convenience, the two power supply lines from the AC power source PS are distinguished by adding "+" and "-". Also, the line connected from one of the lines, AC+, via the light on/off switch 11 is designated as SW. When wiring is performed normally, AC+ is connected to terminal 1, SW is connected to terminal 2, and AC- is connected to terminal 3.

Meanwhile, the LED lighting device 1 includes a lighting circuit section 2 that turns the lighting LED 23 on and off by operating the on/off switch 11, and an emergency circuit section 3 that keeps the emergency LED 37 on continuously when the power supply from the AC power source PS is stopped due to a power outage or other reason.

The lighting circuit section 2 is connected to terminals 2 and 3. When the light on/off switch 11 is turned on, AC power is supplied to the lighting circuit section 2, and when the light on/off switch 11 is turned off, the power supply to the lighting circuit section 2 is stopped. The AC power supplied to the lighting circuit section 2 is full-wave rectified by a diode bridge (hereinafter simply called a bridge) 21, converted to DC power of a specified voltage by an AC/DC converter 22, and supplied to the lighting LEDs 23.

Meanwhile, terminal 1 and terminal 3 are connected to the emergency circuit section 3, and AC power is always supplied from the AC power source PS regardless of the on/off state of the light on/off switch 11. The supplied AC power is converted to DC power of a predetermined voltage by the bridge 31 and AC/DC converter 32, and then converted to voltage and current for charging the charging medium 34 by the DC/DC converter 33, which charges the charging medium 34. If charging of the charging medium 34 stops due to a power outage or the like, the power outage detection circuit 35 detects the charging stop and lights up the emergency LED 37 with the power charged in the charging medium 34.

The charging medium 34 may be a rechargeable secondary battery, or an electric double layer capacitor with excellent maintainability may be used. However, taking into consideration that a large amount of power is consumed to rapidly charge the charging medium 34 and that power outages do not occur very frequently, the DC/DC converter 33 is set to charge the charging medium 34 with such low power that it takes at least several hours for the charging medium 34 to be charged with enough power to light the emergency LED 37 from a state in which the power charged in the charging medium 34 is zero. Therefore, immediately after the LED lighting device 1 is installed, the charging medium 34 may not be sufficiently charged, and in such a state where the charging power is insufficient, the emergency LED 37 may not light up even if a power outage occurs.

In the above configuration, it is sufficient if the three lines from the AC power source PS are wired correctly to each terminal, but if incorrect wiring occurs, the contractor must quickly recognize the incorrect wiring and correct it to the correct wiring.

There are five possible wiring errors, numbered Error 1 through Error 5, as shown in the table at the top of Figure 3.

If it is mistake 1, AC+ and SW are wired to the lighting circuit section 2, but because AC+ and SW are at the same potential, no power is supplied, and the lighting LED 23 does not light up even if the light on/off switch 11 is turned on and off, so it is immediately possible to recognize that there is a wiring error.

If it is error 2, AC+ and AC- are wired to the lighting circuit section 2, and the lighting LED 23 will be lit, but even if the light on/off switch 11 is turned off, the lighting LED 23 will not be turned off, so it is immediately possible to recognize that there is a wiring error.

If it is mistake 3, just like mistake 1, turning the light on/off switch 11 on/off will not light up the lighting LED 23, so it is immediately recognizable that it is a wiring error.

If it is error 4, as with error 2, the lighting LED 23 will continue to light even if the light on/off switch 11 is turned off, so it is immediately possible to recognize that it is a wiring error.

In the case of error 5, power is supplied to the lighting circuit section 2 via the on/off switch 11, so the lighting LED 23 turns on and off in response to the on/off operation of the on/off switch 11, and the lighting LED 23 appears to operate normally. However, power is not supplied to the emergency circuit section 3, and the state is the same as when a power outage occurs, so the emergency LED 37, which should not be turned on, should turn on. However, as described above, if the charging medium 34 is not sufficiently charged, it takes several hours to charge, so there are cases where the emergency LED 37 does not turn on even if the power outage detection circuit 35 detects the occurrence of a power outage immediately after the LED lighting device 1 is installed, and in that case, a problem occurs in which the installer is unable to recognize the occurrence of a wiring error.

In view of the above problems, the present invention aims to provide an LED lighting device that has terminals to which three lines from an AC power source are connected, and that can reliably recognize the occurrence of incorrect wiring if it occurs in any of the terminals during installation.

In order to solve the above problems, an LED lighting device according to the present invention is 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 turned on with the power charged in the charging medium when the charging power to the charging medium is lost, and an illumination LED that is turned on with power supplied from the external AC power source via a light-on/off switch, the LED lighting device comprising a terminal 1 to which one of the lines of both poles of the AC power source is connected, a terminal 2 to which a line passing through the light-on/off switch is connected from the one line, and a terminal 3 to which the other of the lines of both poles of the AC power source is connected, the charging medium is connected to terminals 1 and 3, and the illumination LED is connected to terminals 2 and 3, an AC /DC converter that supplies power for lighting the illumination LED has an enable terminal (EN terminal), and when power from the AC power source is supplied between terminals 1 and 2, a signal to this enable terminal is cut off to stop operation of the AC/DC converter so that the illumination LED does not light up.

When wiring is done correctly, no power is supplied from the AC power source between terminal 1 and terminal 2. If incorrect wiring causes power to be supplied from the AC power source between terminal 1 and terminal 2, the lighting LED is configured not to light up, thereby detecting the occurrence of incorrect wiring.

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, a capacitor is provided which is charged when the phototransistor constituting this photocoupler is turned on, and a switch element is provided which turns on when the charging voltage of this capacitor reaches a predetermined voltage, and when this switch element turns on, the enable terminal is dropped to Lo, thereby stopping the operation of the AC/DC converter.

The power for charging the capacitor can be generated by a power supply circuit connected to terminal 2.

As is clear from the above explanation, the present invention relates to an LED lighting device having three terminals to which wiring from an external commercial power source is connected, and improper wiring during installation can be identified immediately after installation, and the improper wiring can be corrected immediately.

FIG. 1 shows a configuration of an embodiment of the present invention. Check pattern for incorrect wiring immediately after installation Block diagram showing the configuration of a conventional LED lighting device

Referring to Figure 1, the components denoted by the same reference numerals as those in Figure 3 above are similar to those shown in Figure 3, and so their explanation will be omitted.

The LED lighting device 1 according to the present invention is characterized in that it includes a light-inhibiting circuit 4 that, when power is supplied from the AC power source PS between terminals 1 and 2 in one of multiple miswiring patterns, drops the enable terminal 51 to Lo, stopping the operation of the AC/DC converter 22 and preventing the lighting LED 23 from lighting up.

This light-inhibiting circuit 4 is connected to terminal 1 and terminal 2. Therefore, if the wiring is normal, the voltage of the commercial power supply PS is not applied to the light-inhibiting 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 turns on every time the LED 41 emits light, so the capacitor 43 is intermittently charged at the frequency of the AC power supply, and the charging potential rises in stages. When the charging potential of this capacitor 43 rises to a predetermined potential, the transistor 44 turns on and the enable terminal 51 drops to Lo. In this embodiment, IC5 in AC/DC converter 22 is configured to pull enable terminal 51 to Hi internally, and when enable terminal 51 is not pulled to Lo, IC5 operates and AC/DC converter 22 can supply power to lighting LED 23, but as described above, when enable terminal 51 is pulled to Lo, LC5 stops operating and AD/DC converter 22 cannot supply power to lighting LED 23, and as a result, lighting LED 23 does not light up. Note that HV10, which is the operating power of this lighting prohibition circuit 4, is configured to be generated by power supply circuit 6 using power supplied from terminal 2.

This power supply circuit 6 has a built-in Zener diode 61, which charges a capacitor 62 at a predetermined breakdown voltage, and this breakdown voltage is output from the power supply circuit 6 as HV10.

With the above configuration, referring to FIG. 2, if the wiring is properly done from the three terminals 1 to 3 as shown, when the light on/off switch 11 is off, the power supply circuit 6 does not operate and the light prohibition circuit 4 does not operate. Also, when the light on/off switch 11 is turned on, the temporary power supply 6 operates, but terminals 1 and 2 have the same potential, and the LED 41 of the photocoupler does not light up. Therefore, the light prohibition circuit 4 does not operate. As a result, the lighting LED 23 turns on and off according to the on/off of the light on/off switch 11, confirming that the wiring is normal.

Next, if the incorrect wiring shown in Error 1 occurs, the power supply circuit 6 will operate and the enable terminal 51 will drop to Lo regardless of whether the light on/off switch 11 is on or off, so the lighting LED 23 will remain off and the occurrence of the incorrect wiring can be confirmed.

Next, if the incorrect wiring shown in Error 2 occurs, when the light on/off switch 11 is in the OFF state, AC power is supplied to the lighting circuit section 2 and the lighting LED 23 is turned on, but when the light on/off switch 11 is turned on, the light prohibition circuit 4 is activated and turns off the lighting LED 23. In other words, the on/off state of the light on/off switch 11 and the on/off state of the lighting LED 23 are reversed, so the occurrence of incorrect wiring can be confirmed.

Next, if the incorrect wiring shown in Error 3 occurs, no AC power is supplied to the lighting circuit section 2 regardless of whether the light on/off switch 11 is on or off, so the lighting LED 23 does not light up, and the occurrence of the incorrect wiring can be confirmed.

Next, if the incorrect wiring shown in 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 whether the light on/off switch 11 is on or off, the enable terminal 51 does not drop to Lo. Therefore, even if the light on/off switch 11 is turned on and off, the lighting LED 23 continues to light up, and it is possible to confirm the occurrence of incorrect wiring.

Finally, if the incorrect wiring shown in Error 5 occurs, AC power is supplied to Terminal 1 and Terminal 2, so the enable terminal 51 is pulled down to Lo, and the lighting LED 23 remains off regardless of whether the light on/off switch 11 is on or off, allowing you to confirm the occurrence of the incorrect wiring.

In this way, with the above configuration, it is possible to distinguish between all cases of incorrect wiring and cases where the wiring is performed correctly, and it is possible to check for the occurrence of incorrect wiring on the spot where the lighting fixture is installed, thereby preventing the occurrence of incorrect wiring.

The present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the present invention.

REFERENCE SIGNS LIST 1 Lighting device 2 Lighting circuit section 3 Emergency circuit section 4 Lighting prohibition circuit 11 Light on/off switch 23 Lighting LED
37 Emergency LED
51 Enable terminal

Claims (3)

2. 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 turned on with the power charged in the charging medium when the charging power to the charging medium is lost; and an illumination LED that is turned on with power supplied from the external AC power source via a light-on/off switch, the LED lighting device comprising: a terminal 1 to which one of two lines of both poles of the AC power source is connected; a terminal 2 to which a line passing through the light-on/off switch is connected from the one line; and a terminal 3 to which the other of two lines of the AC power source is connected, the charging medium being connected to terminals 1 and 3, and the illumination LED being connected to terminals 2 and 3, an AC /DC converter that supplies power for lighting the illumination LED has an enable terminal (EN terminal), and when power from the AC power source is supplied between terminals 1 and 2, a signal to this enable terminal is cut off to stop operation of the AC/DC converter so that the illumination LED does not light up. The LED lighting device according to claim 1, characterized in that an LED constituting a photocoupler is connected between the terminals 1 and 2, a capacitor is provided which is charged when the phototransistor constituting the photocoupler is turned on, and a switch element is provided which turns on when the charging voltage of the capacitor reaches a predetermined voltage, and when the switch element turns on, the enable terminal is dropped to Lo and the operation of the AC/DC converter is stopped. The LED lighting device according to claim 2, characterized in that the power for charging the capacitor is generated by a power supply circuit connected to the terminal 2.