JP5470909B2 - LED lighting device - Google Patents

Description

  The present invention relates to an LED lighting device that lights an LED using a commercial power source or a battery power source.

  For example, there are a guide light and an emergency light as a lighting device for performing guidance display of an evacuation passage or the like, and an LED using a light source is adopted. The LED, which is a light source, is always turned on with power from a commercial power supply, and the LED, which is a light source, is turned on with power from a battery in an emergency such as a power failure of the commercial power supply (see, for example, Patent Document 1).

  Since the required brightness is legally determined in the LED guide light, it is necessary to replace the LED when the brightness of the LED decreases after a long period of use. The light source device capable of replacing the LED has a substrate side connection portion that is detachably connected to a power supply side connection portion that supplies power to the light emitting diode element module and is electrically connected to the light emitting diode element. Thus, there is one that can replace the light emitting diode element by replacing the light emitting diode element module (see, for example, Patent Document 1).

JP 2002-304902 A

  However, although it is possible to replace the LED in Patent Document 1, there is no consideration for adjustment of the threshold value of the safety circuit and the brightness of the short circuit failure determination caused by the difference in the characteristics of the replaced LED. The efficiency of LEDs has been increasing year by year, and the characteristics of LEDs at the time of actually replacing LEDs have also changed compared to the LEDs before replacement. For example, the LED terminal voltage Vf is lowered to increase efficiency. Have been developed. When such an LED is used, there is a possibility that the safety circuit malfunctions because it is less than the threshold value of the safety circuit for determining a short circuit failure of the LED.

  Further, at the time of actually replacing the LED, a more efficient LED is commercialized, and when the LED is used, the luminance may exceed the upper limit. FIG. 7 is an explanatory diagram of an example of a lighting circuit portion of a conventional LED lighting device at normal and emergency times. Normally, the lighting current flowing through the LED 30 of the LED light source unit 19 is fed back through the constant current feedback circuit 20, and the LED lighting circuit 16 always controls the LED light source unit 19 through the lighting control circuit 22. To do. The lighting current fed back through the constant current feedback circuit 20 is always input to the current detection resistor 31 of the LED lighting circuit 16. The calculation unit 32 of the constant LED lighting circuit 16 calculates the lighting current of the LED light source unit 19 and outputs it to the lighting control circuit 22 so that the voltage value of the current detection resistor 31 is maintained at a predetermined value.

  That is, since the lighting current supplied to the LED light source unit 19 is always determined by the current detection resistor 31 of the LED lighting circuit 16, the lighting current suitable for the LED light source unit 19 before replacement is set to flow. . Therefore, when it replaces | exchanges for the LED light source part 19 using efficient LED, a brightness | luminance becomes higher than the LED light source part 19 before replacement | exchange.

  On the other hand, in the event of an emergency when the commercial power supply fails, the emergency power supply circuit 25 inputs the lighting current flowing through the LED 30 of the LED light source unit 19 and boosts the DC voltage from the battery (not shown) to increase the LED light source unit. Is supplied to the LED light source unit 19 through the lighting control circuit 22. Also in this case, the lighting current flowing through the LED 30 of the LED light source unit 19 is input to a current detection resistor (not shown) of the emergency power supply circuit 25, and the emergency power supply circuit 25 sets the voltage value of the current detection resistor to a predetermined value. The lighting current of the LED light source unit 19 is calculated and output to the lighting control circuit 22 so as to be maintained.

  In an emergency, the lighting current supplied to the LED light source unit 19 is determined by the current detection resistor of the emergency power supply circuit 25. Therefore, even in an emergency, a lighting current suitable for the LED light source unit 19 before replacement is passed. Is set to Therefore, when it replaces | exchanges for the LED light source part 19 using efficient LED, a brightness | luminance becomes higher than the LED light source part 19 before replacement | exchange.

  The objective of this invention is providing the LED lighting device which can avoid the malfunctioning of a safety circuit and can maintain the brightness | luminance of LED appropriately, even when it is a case where a LED light source part is replaced | exchanged.

The LED lighting device according to claim 1 includes a plurality of LEDs and a plurality of voltage adjusting elements connected in series to the LEDs, and the LEDs and the voltage adjusting elements are alternately connected. LED light source unit and that, at all times and the power supply circuit to obtain a continuous power supply from the DC voltage converted into direct current alternating current from the commercial power source; the always always to light the LED of the LED light source unit in the DC power from the backup power circuit very to light the LED by supplying the DC voltage from the battery in an emergency where the commercial power source becomes the power failure to the LED light source unit; and the LED lighting circuit; is always battery and charging the electric power from the commercial power source when the power supply circuit and, when the LED and the voltage of each of the voltage regulating device of a predetermined number of adjacent of the LED light source unit is less than the threshold before determining that short-circuit failure of the LED A safety circuit for stopping the power supply to the LED light source unit; and when the LEDs are normal when alternately connected in series to the LEDs of the LED light source unit, the voltage of the predetermined number of LEDs of the LED light source unit is the safety circuit And a voltage adjusting element that is held above the threshold value.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

  The LED lighting device lights a lighting device using an LED as a light source using a commercial power source or a battery power source. The illuminating device is an illuminating device for performing guidance display such as an evacuation passage.

  The constant power supply circuit may be, for example, any of a flyback circuit, a forward circuit, and a regulator power supply system that steps down a commercial power supply with a transformer. The always-on LED lighting circuit may be a circuit that feeds back the current flowing through the LED light source unit and controls the DC power from the always-on power circuit. The battery always accumulates DC power from the normal power supply circuit as an emergency power supply, and discharges the power for lighting to the LED light source in an emergency when the commercial power supply fails.

  The emergency power supply circuit is a circuit that supplies power stored in the battery as power for lighting to the LED light source when the commercial power supply is in a power failure. The emergency power supply circuit may be any of a flyback circuit, a forward circuit, a boost chopper circuit, a regulator power supply system, and the like.

  The safety circuit refers to a circuit that monitors an abnormality of the LED light source unit and stops power supply to the LED light source unit when an abnormality is detected. For example, the safety circuit monitors the voltage of a predetermined number of LEDs connected in series to the LED light source unit, and determines that a short-circuit fault has occurred in the LED when the voltage of the predetermined number of LEDs falls below a threshold value. Stop power supply.

  With the voltage adjusting element, the voltage of the predetermined number of LEDs connected in series in the LED light source unit after replacement is equivalent to the voltage of the predetermined number of LEDs connected in series in the LED light source unit before conversion. The element which adjusts the voltage of the predetermined number of LEDs connected in series of the LED light source units connected in series to the predetermined number of LEDs connected in series of the converted LED light source units. In other words, the voltage adjusting element is connected in series to the location of the LED light source unit that detects the short circuit failure of the LED of the safety circuit, and adjusts the voltage of a predetermined number of LEDs connected in series in the LED light source unit after the change. It is an element. As the voltage adjusting element, for example, it is desirable to use a diode having substantially the same current-voltage characteristics as the LED.

  According to a second aspect of the present invention, there is provided an LED lighting device according to the first aspect of the present invention, wherein the current setting for setting the lighting current to be supplied to the LED of the LED light source unit from the always-on LED lighting circuit and the emergency power supply circuit. A part is provided in the LED light source part.

  The current setting unit refers to a setting unit for setting a lighting current according to the luminance characteristics of the LED of the LED light source unit. For example, a current detection resistor for detecting a current flowing through the LED of the LED light source unit or an identification electric signal for identifying the luminance characteristic of the LED of the LED light source unit is set. The constant LED lighting circuit and the emergency power supply circuit control the lighting current supplied to the LED of the LED light source unit based on the information set in the current setting unit. Thereby, the lighting current suitable for the brightness | luminance characteristic of LED of the replaced LED light source part is supplied.

  According to the first aspect of the present invention, when the predetermined number of LEDs connected in series in the LED light source unit is normal, the voltage of the predetermined number of LEDs connected in series in the LED light source unit is maintained at or above the threshold value of the safety circuit. Therefore, even if the LED light source unit is replaced, it is possible to avoid malfunction of the safety circuit without changing the threshold value of the safety circuit.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the always-on LED lighting circuit and the emergency power supply circuit supply the LEDs of the LED light source unit based on the information set in the current setting unit. Since the lighting current is controlled, a lighting current suitable for the luminance characteristics of the LED of the replaced LED light source unit can be supplied. Even if the LED light source part is replaced, the legally defined luminance can be obtained.

The circuit block diagram of the LED lighting device concerning the 1st Embodiment of this invention. Explanatory drawing of an example at the time of determining the short circuit failure of LED of the LED light source part in the stable circuit in the 1st Embodiment of this invention. The circuit block diagram of Example 1 of the LED lighting device concerning the 2nd Embodiment of this invention. Explanatory drawing of the lighting circuit part at the time of normal and emergency of the LED lighting device shown in FIG. The circuit block diagram of Example 2 of the LED lighting device concerning the 2nd Embodiment of this invention. Explanatory drawing of the lighting circuit part of the LED lighting device 29 shown in FIG. Explanatory drawing of an example of the lighting circuit part at the time of the usual and emergency in the conventional LED lighting device.

  Embodiments of the present invention will be described below. FIG. 1 is a circuit configuration diagram of an LED lighting device according to a first embodiment of the present invention. The alternating current from the commercial power supply 11 is input to the rectifier circuit 12 and converted to direct current. The direct current obtained by the rectifier circuit 12 is input to the power supply monitoring circuit 13, smoothed by the smoothing capacitor C <b> 1, and always input to the power supply circuit 14. The constant power supply circuit 14 steps down the DC voltage obtained by the rectifier circuit 12 to obtain a regular power supply. The regular power supply circuit 14 supplies the regular power supply to the charging circuit 15 via the transformer Tr1, the diode D1, and the smoothing capacitor C2. A regular power supply is supplied to the LED lighting circuit 16 through the Tr1, the diode D2, and the smoothing capacitor C3. In this way, when the AC power supply 11 is normal, the charging circuit 15 always stores the emergency power supply in the battery 21 with the normal power supply obtained through the transformer Tr1, the diode D1, and the smoothing capacitor C2 of the power supply circuit 14. .

  On the other hand, the constant LED lighting circuit 16 is a normal power source obtained through the transformer Tr1, the diode D2, and the smoothing capacitor C3 of the constant power supply circuit 14, and the lighting current is supplied to the LED light source unit 19 through the lighting control circuit 22 through the diode D3. Supply. In addition, power from the constant power supply circuit 14 is input to the microcomputer 23 as a power supply via the charging circuit 15. The microcomputer 23 is provided with an inspection switch 24, and this inspection switch 24 is a switch for setting a state equivalent to that when the AC power supply 11 is simulated to have a power failure.

  Next, the power supply circuit 18 of the constant power supply circuit 14 feeds back the lighting current supplied from the constant LED lighting circuit 16 to the LED light source unit 19 that is a load through the constant current feedback circuit 20 and supplies it to the LED light source unit 19. The lighting current to be controlled is controlled.

  A voltage adjusting element 36 is connected in series to the LED 30 of the LED light source unit 19. The voltage adjusting element 36 holds the voltage of a predetermined number of LEDs 30 connected in series in the LED light source 19 above the threshold value of the safety circuit 35 when the LEDs 30 are normal.

  The safety circuit 35 determines that the LED 30 of the LED light source unit 19 is short-circuited when the voltage of the predetermined number of LEDs 30 of the LED light source unit 19 to which the voltage adjusting element 36 is connected in series is less than the threshold value. .

  FIG. 2 is an explanatory diagram of an example when the short circuit failure of the LED 30 of the LED light source unit 19 in the stabilization circuit 35 is determined. As shown in FIG. 2, a voltage adjusting element 36 is connected in series to the LED 30 of the LED light source unit 19. FIG. 2 shows a case where the voltage adjusting elements 36 are alternately connected in series to the LEDs 30. The safety circuit 35 detects the voltage for each of the three LEDs 30 to which the voltage adjusting elements 36 are connected in series, and monitors the voltage. The short circuit failure signal of the LED 30 from the safety circuit 35 is input to the microcomputer 23. When the microcomputer 23 inputs the short circuit failure signal of the LED 30 from the safety circuit 35, the power supply to the LED light source unit is stopped.

  In FIG. 2, the voltage is detected for each of the three LEDs 30 as the predetermined number, but the number is not limited to three, and one may be two, or even four or more. Furthermore, it is good also as all the numbers which comprise the LED light source part 19. FIG.

  Next, the normal LED lighting circuit 16 inputs the lighting current of the LED light source unit 19 in which the voltage adjusting element 36 is connected in series to the LED 30 in a normal state, and the LED light source unit is determined by a current detection resistor incorporated in advance. The current is controlled to be 19 load currents. Similarly, the emergency power supply circuit 25 inputs the lighting current of the LED light source unit 19 in which the voltage adjusting element 36 is connected in series to the LED 30 in the non-normal time, and the LED light source determined by the current detection resistor incorporated in advance. The current is controlled to be the load current of the unit 19.

  When the LED 30 of the LED light source unit 19 is normal, the LED light source unit 19 is connected to the LED 30 in series with a voltage adjusting element 36 that holds the voltage of the LED light source unit 19 at or above the threshold value of the safety circuit 35. Therefore, even when the characteristics of the LED 30 of the replaced LED light source unit 19 are different and the lighting current is different, the voltage of the LED light source unit 19 can be kept within the threshold value of the safety circuit 35. Note that the luminance of the LED light source unit 19 before replacement may vary depending on the characteristics of the LED 30 of the replaced LED light source unit 19. In this case, for example, the front surface of the LED 30 of the replaced LED light source unit 19 may be used. A filter is provided to adjust the luminance.

  According to the first embodiment, when the LED 30 of the LED light source unit 19 is normal, the voltage adjusting element 36 that holds the voltage of the LED light source unit 19 at or above the threshold value of the safety circuit 35 is connected in series to the LED 30. Therefore, even if it replaces with the LED light source part 19 from which the characteristic of LED30 differs, the malfunction of the safety circuit 30 can be avoided, without changing the threshold value of the safety circuit 35.

  FIG. 3 is a circuit configuration diagram of Example 1 of the LED lighting device 29 according to the second embodiment of the present invention. In the second embodiment, a lighting current supplied to the LED 30 of the LED light source unit 19 from the constant LED lighting circuit 16 and the emergency power supply circuit 25 is set with respect to the first embodiment shown in FIG. A current setting unit 33 is additionally provided. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 3, the LED light source unit 19 is provided with a current setting unit 33 in which a lighting current to be supplied to the LED light source unit 19 is set, and the constant current feedback circuit 20 includes a current setting unit 33. The lighting current set to is fed back. Accordingly, the constant LED lighting circuit 16 controls the lighting current supplied to the LED of the LED light source unit 19.

  On the other hand, the emergency power supply circuit 25 is activated in the event of an emergency when the commercial power supply 11 is out of power. In addition to being supplied to the LED light source unit 19, power is supplied to the microcomputer 23. The power supply monitoring circuit 13 detects that the commercial power supply 11 has failed.

  When the power supply monitoring circuit 13 detects that the commercial power supply 11 has failed, the microcomputer 23 notifies the microcomputer 23, and the microcomputer 23 activates the IC 26 of the emergency power supply circuit 25. When the IC 26 is activated, it inputs the lighting current set in the current setting unit 33 of the LED light source unit 19, and the lighting current of the LED light source unit 19 becomes the lighting current of the current setting unit 33. The switch element 27 is turned on / off to boost the output voltage of the battery 21, and the boosted voltage is supplied to the lighting control circuit 22 via the transformer Tr2, the diode D4, and the smoothing capacitor C4, and the transformer Tr2, Power is supplied to the microcomputer 23 via the diode D5 and the smoothing capacitor C5.

  FIG. 4 is an explanatory diagram of the lighting circuit portion of the LED lighting device 29 shown in FIG. In contrast to the conventional example shown in FIG. 7, the current detection resistor incorporated in the always-on LED lighting circuit 16 and the emergency power supply circuit 25 is incorporated in the LED light source unit 19 as the current setting unit 33. The same elements as those in FIG.

  In FIG. 4, the LED light source unit 19 is provided with a current setting unit 33. The current setting unit 33 is provided with a current detection resistor 31a for setting a lighting current to be supplied from the LED lighting circuit 16 to the LED 30 of the LED light source unit 19 at all times, and from the emergency power circuit 25 to the LED 30 of the LED light source unit 19. A current detection resistor 31b for setting a lighting current to be supplied to is provided. These current detection resistors 31a and 31b are switched by a switch 34, and the LED 30 of the LED light source unit 19 is normally connected to the current detection resistor 31a, and the power supply monitoring circuit 13 detects that the commercial power supply 11 has failed. When this occurs, the current detection resistor 31a is switched.

  For example, in the case of a guide light, the lighting current value is different between normal and emergency, and the brightness is standardized along with the normal and emergency. It is very effective to make it.

FIG. 5 is a circuit configuration diagram of Example 2 of the LED lighting device 29 according to the second embodiment of the present invention. The second embodiment to the first embodiment shown in FIG. 3, enter the setting information set in the current setting unit 33 to the microcomputer 23, the lighting current of the constant LED lighting circuit 16 and the emergency power supply circuit 25 In addition to the control, the microcomputer 23 also controls the lighting current. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 5, the setting information of the current setting unit 33 is always input to the LED lighting circuit 16 and the emergency power supply circuit 25 and also to the microcomputer 23. The constant LED lighting circuit 16 controls the current so as to be a load current of the LED light source unit 19 determined by a current detection resistor incorporated in advance in a normal state. Similarly, the emergency power supply circuit 25 controls the current so that it becomes the load current of the LED light source unit 19 determined by the current detection resistor incorporated in advance in the non-normal time. Then, the microcomputer 23 outputs a command to the LED lighting circuit 16 and the emergency power supply circuit 25 so that the load current according to the LED characteristics of the LED light source unit 19 is obtained.

  FIG. 6 is an explanatory diagram of the lighting circuit portion of the LED lighting device 29 shown in FIG. In contrast to the conventional example shown in FIG. 7, a current setting unit 33 in which identification information for identifying the LED light source unit 19 is set is incorporated in the LED light source unit 19. The same elements as those in FIG.

  Identification information for identifying the LED light source unit 19 is set in the current setting unit 33. FIG. 6 shows a case where the LED light source unit 19 is identified by voltage information obtained by dividing the power supply voltage. This identification information is information for identifying the LED light source unit 19 and, as a result, information for identifying the lighting current corresponding to the LED characteristics of the LED light source unit 19.

  Normally, the LED lighting circuit 16 always inputs the lighting current fed back through the constant current feedback circuit 20 to the current detection resistor 31, and the calculation unit 32 of the LED lighting circuit 16 always has the voltage of the current detection resistor 31. The lighting current of the LED light source unit 19 is calculated and output to the lighting control circuit 22 so that the value is maintained at a predetermined value. In this case, the lighting current supplied to the LED light source unit 19 is controlled to flow a constant lighting current suitable for the LED light source unit 19 before replacement.

  Similarly, in an emergency, the emergency power supply circuit 25 inputs the lighting current of the LED light source unit 19 to a current detection resistor (not shown), and the LED light source so that the voltage value of the current detection resistor is maintained at a predetermined value. The emergency lighting current of the unit 19 is calculated and output to the lighting control circuit 22. Also in this case, the lighting current supplied to the LED light source unit 19 is controlled to flow an emergency lighting current suitable for the LED light source unit 19 before replacement.

  On the other hand, the microcomputer 23 inputs identification information for identifying the LED light source unit 19 incorporated in the LED light source unit 19, and determines the lighting current according to the LED characteristics of the LED light source unit 19 based on this identification information. . That is, the microcomputer 23 stores in advance a lighting current corresponding to the LED characteristics of the LED light source unit 19 corresponding to the identification information of the LED light source unit 19, and when the identification information is input, With reference to the table, the lighting current corresponding to the LED characteristics of the LED light source unit 19 is acquired.

  Then, a control command for correcting the lighting current suitable for the LED light source unit 19 before replacement, which is output from the constant LED lighting circuit 16 or the emergency power circuit 25, is output to the constant LED lighting circuit 16 or the emergency power circuit 25. To do. As a result, the constant LED lighting circuit 16 and the emergency power supply circuit 25 output a lighting current corresponding to the LED characteristics of the LED light source unit 19 to the LED light source unit 19.

  According to Examples 1 and 2 of the second embodiment, in addition to the effects of the first embodiment, the LED light source unit 19 is provided with a current setting unit that adjusts the luminance according to the LED characteristics. Therefore, it is possible to adjust the luminance according to the LED characteristics of the LED light source unit 19 without changing the LED lighting circuit 16 or the emergency power supply circuit 25 at all times. In particular, in the case of Example 2, even when the LED lighting circuit 16 and the emergency power supply circuit 25 always have a current detection resistor, the LED light source unit 19 according to the characteristics of the replaced LED light source 19 is used. The brightness can be adjusted.

DESCRIPTION OF SYMBOLS 11 ... Commercial power supply, 12 ... Rectification circuit, 13 ... Power supply monitoring circuit, 14 ... Constant power supply circuit, 15 ... Charging circuit, 16 ... Constant LED lighting circuit, 18 ... Power supply circuit, 19 ... LED light source part, 20 ... Constant current feedback Circuit, 21 ... Battery, 22 ... Lighting control circuit, 23 ... Microcomputer, 24 ... Inspection switch, 25 ... Emergency power circuit, 26 ... IC, 27 ... Switch element, 29 ... LED lighting device, 30 ... LED, 31 ... Current detection resistor, 32... Arithmetic unit, 33... Current setting unit, 34... Switch, 35 .. safety circuit, 36.

Claims (2)

An LED light source unit including a plurality of LEDs and a plurality of voltage adjusting elements connected in series to the LEDs, wherein the LEDs and the voltage adjusting elements are alternately connected;
A constant power circuit for obtaining a constant power from a DC voltage obtained by converting AC from a commercial power source into DC;
Always the and Permanent LED lighting circuit for lighting the LED of the LED light source unit in the DC power from the backup power circuit;
A battery that normally charges power from the commercial power source;
And emergency power supply circuit in an emergency where the commercial power source becomes the power failure to light the LED by supplying the DC voltage from the battery to the LED light source unit;
And safety circuit when the LED and the voltage of each of the voltage regulating device of a predetermined number of adjacent of the LED light source unit is less than the threshold value for stopping the power supply to the judges that short-circuit failure of the LED the LED light source unit ;
A voltage adjustment element that is alternately connected in series to the LEDs of the LED light source unit and holds the voltage of a predetermined number of LEDs of the LED light source unit at or above a threshold value of the safety circuit when the LEDs are normal;
An LED lighting device comprising:   2. The LED light source unit according to claim 1, further comprising a current setting unit configured to set a lighting current to be supplied to the LED of the LED light source unit from the always-on LED lighting circuit and the emergency power source circuit. LED lighting device.

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