JP5088711B2 - LED lighting device and lighting device - Google Patents

Description

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

  For example, there are a guide light and an emergency light as an illumination device for performing guidance display of an evacuation passage or the like, and a light source using a fluorescent lamp as 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). Such an illuminating device is equipped with a microcomputer for monitoring and control, and the main microcomputer power supply in an emergency is to supply power directly from a battery.

  Then, periodic inspections are carried out every predetermined period (for example, half a year), and in the event of an emergency such as a power failure of the commercial power supply, the LED that is the light source is supplied with power from the battery for a predetermined time (for example, 20 minutes) or more. I try to check if I can continue lighting. In this case, the inspection result is monitored by the microcomputer and stored as data.

JP 2006-286339 A

  However, since an illumination device using an LED has higher efficiency than a conventional illumination device using a fluorescent lamp, there is a demand for downsizing of the illumination device by reducing the size of the battery. Therefore, to reduce the size of the battery, it is conceivable to reduce the number of cells in the battery. However, if the number of cells is reduced, the battery voltage will be lowered. In the case of supplying the battery, there is a possibility that an appropriate voltage capable of operating the microcomputer cannot be secured.

  An object of the present invention is to provide an LED lighting device and a lighting device that do not interfere with the operation of the microcomputer in an emergency even when the battery voltage is lower than the microcomputer operating voltage.

An LED lighting device according to a first aspect of the present invention comprises: a constant power circuit that converts alternating current from a commercial power source into direct current; a microcomputer that is always operated by power supply from the constant power circuit; and an operating voltage of the microcomputer A battery having a lower voltage value in a fully charged state; a charging circuit for charging the battery with DC power from the constant power supply circuit; and a DC voltage from the battery in an emergency when the commercial power supply becomes a power failure or a pseudo power failure with obtaining the emergency power supply of L ED light source section lit by boosting the, emergency power supply circuit and supplies power for operation to boost the DC voltage from the battery to the microcomputer; by comprising Features.

  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 microcomputer monitors and controls the entire LED lighting device, and always uses a normal power supply from a power supply circuit as a power source.

  The microcomputer operating voltage is a voltage value at which the microcomputer operates normally. The emergency power supply circuit is a circuit that boosts the DC voltage stored in the battery and supplies it to the LED light source unit as lighting power when the commercial power supply is out of power, and also supplies the microcomputer with an operating voltage. is there. 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.

  According to a second aspect of the present invention, there is provided the LED lighting device according to the first aspect of the present invention, wherein the microcomputer stores stored information if the microcomputer is supplied with a voltage not less than a predetermined voltage set lower than the microcomputer operating voltage. Storage means that can continue to hold, the voltage value of the battery is set higher than the predetermined voltage value of the storage means, the power supply switching from the always-on power supply circuit to the emergency power supply circuit Instantaneously, power is supplied from the battery to the microcomputer, and then power is supplied from the emergency power supply circuit to the microcomputer.

  The instant of power switching is the time until the boost operation of the battery voltage by the emergency power circuit is completed when the power is switched from the constant power circuit to the emergency power circuit.

  According to a third aspect of the present invention, there is provided the LED lighting device according to the first aspect of the present invention, wherein the microcomputer stores stored information if the microcomputer is supplied with a voltage not less than a predetermined voltage set lower than the microcomputer operating voltage. Storage means that can continue to be held, and the instantaneous power switching from the always-on power circuit to the emergency power circuit is stored in the always-on power circuit so as to be higher than a predetermined voltage value of the storing means. The auxiliary power supply is supplied to the microcomputer, and then power is supplied to the microcomputer from the emergency power supply circuit.

  The auxiliary power supply of the always-on power supply circuit means, for example, the charge stored in the smoothing capacitor that constitutes the always-on power supply circuit, and uses the charge discharged from the smoothing capacitor when the power supply is switched. Thus, by using the smoothing capacitor that is always used in the power supply circuit at the time of switching the power supply, the state of the microcomputer can be properly maintained without adding a new member.

  A lighting device according to a fourth aspect of the present invention comprises: a lighting fixture body that houses an LED light source portion; and an LED lighting device according to any one of claims 1 to 3 that lights the LED light source portion housed in the lighting fixture body. And characterized by comprising:

  The illuminating device main body is a housing having a display plate for performing guidance display, and the LED light source unit illuminates the display plate. The display board is provided on at least one of the front side and the back side of the lighting device body.

  According to the invention of claim 1, in the event of an emergency when the commercial power supply fails, the emergency power supply for lighting the LED light source unit obtained by boosting the DC voltage from the battery is used as the microcomputer power supply. Even if the power supply is lower than the power supply of the microcomputer, it is possible to suppress the occurrence of problems in the operation or function of the microcomputer. Furthermore, the number of battery cells can be reduced, and the battery can be reduced in size.

  According to the second aspect of the present invention, when the power source is switched from the constant power source circuit to the emergency power source circuit, power is supplied from the battery to the microcomputer until the boosting of the battery voltage by the emergency power source circuit is completed. The information stored in the storage means of the microcomputer is not reset when the power source is switched from the constant power source circuit to the emergency power source circuit.

  According to the third aspect of the present invention, when the power supply is switched from the always-on power supply circuit to the emergency power supply circuit, the electric charge stored in the always-on power supply circuit is microcharged until the boosting of the battery voltage by the emergency power supply circuit is completed. Since the power is supplied to the computer, the information stored in the storage means of the microcomputer is not reset even if a voltage change occurs when the power is switched from the constant power circuit to the emergency power circuit.

  According to invention of Claim 4, the illuminating device which has the effect of the LED lighting device as described in any one of Claim 1 thru | or 3 can be provided.

The circuit block diagram of the LED lighting device concerning embodiment of this invention. Explanatory drawing of the voltage of the microcomputer power supply in embodiment of this invention. Explanatory drawing of the illuminating device concerning embodiment of this invention. The side view of the illuminating device for 2 displays concerning embodiment of this invention. Explanatory drawing of the connection state of the LED light source part of the illuminating device for 2 displays shown in FIG.

  FIG. 1 is a circuit configuration diagram of an LED lighting device according to an 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. The power supply circuit 18 of the constant power supply circuit 14 feeds back the lighting current supplied from the LED lighting circuit 16 to the LED light source unit 19 as a load via the constant current feedback circuit 20 and supplies the current to the LED light source unit 19. Controls the lighting current.

  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 Tr2, the diode D2, and the smoothing capacitor C3 of the constant power supply circuit 14, and a 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.

  The emergency power circuit 25 is activated in the event of a power failure of the commercial power supply 11 and boosts the DC voltage from the battery 21 to supply an emergency power source for lighting the LED light source unit via the lighting control circuit 22. 19 and a power supply 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, 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. At the same time, power is supplied to the microcomputer 23 via the transformer Tr2, the diode D5, and the smoothing capacitor C5.

  FIG. 2 is an explanatory diagram of the voltage of the microcomputer power supply. The microcomputer operating voltage VDD is a voltage necessary for normal operation of the microcomputer 23, the FLASH operation maintaining voltage Va is a voltage necessary for normal operation with respect to data in the flash memory area of the microcomputer 23, and the RAM data holding voltage Vb is This voltage is necessary to keep the data in the RAM area of the microcomputer 23 from being erased.

  In the embodiment of the present invention, an emergency power supply obtained by boosting the battery voltage by the emergency power supply circuit 25 is supplied as a microcomputer power supply in an emergency, so that the transformer Tr2, diode D5, smoothing of the emergency power supply circuit 25 is supplied. The emergency power supply voltage obtained by the capacitor C5 is set to be equal to or higher than the microcomputer operating voltage VDD. Thereby, it is possible to ensure that the microcomputer 23 operates normally even in an emergency.

  Here, there is a region where the voltage becomes unstable when the power source is switched from the constant power source circuit 14 to the emergency power source circuit 25. In other words, the emergency power supply that is the output of the emergency power supply circuit 25 may become unstable until the battery voltage boosting by the emergency power supply circuit 25 is completed after a power failure of the commercial power supply.

  Therefore, the output voltage of the battery 21 is set to be equal to or higher than the RAM data holding voltage Vb (more than the voltage at which the data in the RAM area is erased), and the instantaneous power switching from the always-on power supply circuit 14 to the emergency power supply circuit 25 Power is directly supplied from 21 to the microcomputer 23, and then power is supplied from the emergency power supply circuit 25 to the microcomputer 23. As a result, the data in the RAM area can be maintained. In addition, it is set to be equal to or higher than the FLASH operation maintaining voltage Va. The normal operation of the flash memory can also be maintained.

  This is because even if the microcomputer power supply temporarily falls below the microcomputer operating voltage VDD, if the RAM data holding voltage Vb or higher, the data in the RAM area will not be erased, and if the flash power maintaining voltage Va or higher, This is because the normal operation of the flash memory can be maintained and the data in the RAM area can be maintained, and the microcomputer 23 can continue to operate normally when the microcomputer power supply recovers the microcomputer operating voltage VDD.

  In the above description, at the instant of power switching from the constant power supply circuit 14 to the emergency power supply circuit 15, power is supplied directly from the battery 21 to the microcomputer 23. However, the smoothing capacitor C2 of the constant power supply circuit 14 is used. It is also possible to supply the electric charge stored in the microcomputer 23 to the microcomputer 23 and then supply the emergency power from the emergency power supply circuit 25 to the microcomputer 23. In this case, it goes without saying that the voltage supplied to the microcomputer 23 by the charge stored in the smoothing capacitor C2 is set to be equal to or higher than the FLASH operation sustaining voltage Va.

  As described above, regarding the unstable region of the emergency power supply when switching from the constant power supply circuit 14 to the emergency power supply circuit 25, the battery 21 or the constant power supply circuit until the emergency power supply circuit 25 completes the boosting operation. The microcomputer power supply is supplied based on the electric charge stored in the 14 smoothing capacitors C2. As a result, if the microcomputer power supply is maintained at a voltage higher than the voltage at which the data in the RAM area disappears even if the microcomputer power supply temporarily falls below the microcomputer operating voltage VDD, the emergency power supply circuit 25 is in an emergency state after the boosting operation is completed. Since stable emergency power can be supplied from the hour power circuit 25, it is possible to prevent the data in the internal memory of the microcomputer 23 from being destroyed.

  3A and 3B are explanatory views of the lighting device according to the embodiment of the present invention. FIG. 3A is an external perspective view, and FIG. 3B is a partially cutaway front view. A lamp cover 29 is provided in the upper part of the luminaire main body 28, and the LED light source 19 is accommodated in the lamp cover 29. Further, the main body of the LED lighting device 29 shown in FIG. 1 is housed in the central portion of the luminaire main body 28, and the battery 21 and the inspection switch 24 are disposed at the bottom. A display board 30 for displaying guidance information such as an escape passage is disposed on the front surface of the luminaire main body 28.

  As described above, a battery whose battery voltage is lower than the microcomputer operating voltage is adopted as the battery 21. Since the emergency microcomputer power supply is supplied by boosting the battery voltage, the battery 21 can be reduced in size. Yes.

  FIG. 4 is a side view of a two-display lighting device having display plates 30a and 30b on the front and back surfaces of the luminaire main body 28, respectively. As shown in FIG. 4, display plates 30 a and 30 b are provided on the front surface and the back surface of the luminaire main body 28, and the LED light source that illuminates the front display plate 30 a is provided on the lamp cover 29 on the upper portion of the luminaire main body 28. The LED light source part 19b which illuminates the part 19a and the display board 30b on the back side is provided. And the LED light source parts 19a and 19b are connected in series.

  FIG. 5 is an explanatory diagram of a connection state of the LED light source units 19a and 19b of the two-display illumination device illustrated in FIG. As shown in FIG. 5, the LED light source units 19 a and 19 b are connected in series, and power is supplied from one LED lighting device 29. That is, the LED light source units 19a and 19b and the one LED lighting device 29 form one closed circuit. Thereby, the lighting current is commonly supplied to the LED light source units 19a and 19b.

  Thereby, since the LED light source parts 19a and 19b can be illuminated by one LED lighting device 29, it is not necessary to prepare a plurality of LED lighting devices 29. Therefore, the number of parts can be reduced, and the LED lighting device 29 can be downsized and the lighting efficiency can be improved.

DESCRIPTION OF SYMBOLS 11 ... Commercial power supply, 12 ... Rectification circuit, 13 ... Power supply monitoring circuit, 14 ... Constant power supply circuit, 15 ... Charging circuit, 16 ... LED lighting circuit, 17 ..., 18 ... Power supply circuit, 19 ... LED, 20 ... Constant current feedback Circuit, 21 ... Battery, 22 ... Lighting control circuit, 23 ... Microcomputer, 24 ... Inspection switch, 25 ... Emergency power supply circuit, 26 ... IC, 27 ... Switch element, 28 ... Luminaire body, 29 ... Lamp cover, 30 ... Display board

Claims (4)

A constant power circuit that converts AC from commercial power into DC;
A microcomputer that is normally operated by power supply from the power circuit;
A battery having a voltage value in a fully charged state lower than an operating voltage of the microcomputer;
A charging circuit for charging the battery with DC power from the constant power circuit;
Wherein together in an emergency where the commercial power supply becomes a power outage or pseudo outage obtain emergency power supply for the L ED light source unit turned by boosting the DC voltage from the battery, the steps up the DC voltage from the battery microcomputer An emergency power supply circuit for supplying power for operation;
An LED lighting device comprising: The microcomputer has a storage means capable of continuing to store stored information as long as the microcomputer is supplied with a predetermined voltage value lower than the microcomputer operating voltage.
The voltage value of the battery is set higher than the predetermined voltage value of the storage means,
In the instant of power switching from the constant power circuit to the emergency power circuit, power is supplied from the battery to the microcomputer, and then power is supplied from the emergency power circuit to the microcomputer. The LED lighting device according to claim 1. The microcomputer has a storage means capable of continuing to store stored information as long as the microcomputer is supplied with a predetermined voltage value lower than the microcomputer operating voltage.
At the instant of power switching from the always-on power circuit to the emergency power circuit, the power stored in the always-on power circuit so as to be higher than a predetermined voltage value of the storage means is supplied to the microcomputer, and then 2. The LED lighting device according to claim 1, wherein electric power is supplied to the microcomputer from the emergency power supply circuit. A lighting fixture body containing an LED light source;
The LED lighting device according to any one of claims 1 to 3, wherein the LED light source unit housed in the luminaire body is lit.
An illumination device comprising:

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