JP2022003630A - Lighting device, illumination apparatus and luminaire - Google Patents

Abstract

To provide a lighting device, illumination apparatus and luminaire which can suppress the reduction in the lighting time of a light source using discharge power of a battery even when the battery temperature deviates from a predetermined temperature range.SOLUTION: In a lighting device 4, a charging circuit 4d charges a battery 3 with the external power supplied from an external power source 9. A lighting circuit 4g lights a light source 2 with the discharge power of the battery 3. A voltage detection circuit 4h detects battery voltage Vb. A temperature detection circuit 4i detects the battery temperature. The lighting circuit 4g turns off the light source 2 when the battery voltage Vb is less than a first voltage threshold if the battery temperature is within a discharge temperature range in the power outage of the external power source 9. The lighting circuit 4g turns off the light source 2 when the battery voltage Vb is less than a second voltage threshold lower than the first voltage threshold if the battery temperature is outside the discharge temperature range in the power outage of the external power source 9.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to lighting devices, luminaires, and luminaires.

The emergency luminaire described in Patent Document 1 has a lighting unit that controls lighting of a light emitting diode. The lighting unit includes a charge / discharge circuit that charges the battery when the commercial power is supplied and lights the light emitting diode using the battery as the power source when the commercial power is cut off. An ambient temperature detecting means for detecting the ambient temperature of the fixture is connected to the lighting unit.

Then, the lighting unit controls the lighting current to the light emitting diode using the battery as a power source to light the light emitting diode at the time of emergency lighting. Further, the lighting unit controls the lighting current to the light emitting diode using the battery as a power source based on the detection of the ambient temperature detecting means so that the light output of the light emitting diode becomes a predetermined light output.

Japanese Unexamined Patent Publication No. 2006-210238

The capacity of the battery (battery) depends on the battery temperature, and when the battery temperature deviates from a predetermined temperature range, the battery capacity decreases. Therefore, in a lighting fixture that uses the discharge power of a battery to light a light source in an emergency, when the battery temperature deviates from a predetermined temperature range, the lighting time during which the light source can be continuously turned on is shortened.

An object of the present disclosure is to provide a lighting device, a lighting device, and a lighting device capable of suppressing a decrease in the lighting time of a light source using the discharge power of a battery even if the battery temperature deviates from a predetermined temperature range. be.

The lighting device according to one aspect of the present disclosure includes a charging circuit, a lighting circuit, a voltage detection circuit, and a temperature detection circuit. The charging circuit charges the battery with external power supplied from an external power source. The lighting circuit lights the light source with the discharge power of the battery. The voltage detection circuit detects the battery voltage of the battery. The temperature detection circuit detects the battery temperature of the battery. In the lighting circuit, when the battery temperature is within the discharge temperature range at the time of power failure of the external power supply, the light source is turned off when the battery voltage becomes less than the first voltage threshold, and the battery temperature is in the discharge temperature range. If it is outside, when the battery voltage becomes less than the second voltage threshold lower than the first voltage threshold, the light source is turned off.

The lighting device according to one aspect of the present disclosure includes the above-mentioned lighting device, the light source, and the battery.

The luminaire according to one aspect of the present disclosure includes the above-mentioned illuminating device, the lighting device, the light source, and a main body to which at least one of the batteries is attached.

As described above, the present disclosure has an effect that even if the battery temperature deviates from a predetermined temperature range, it is possible to suppress a decrease in the lighting time of the light source using the discharge power of the battery.

FIG. 1 is a block diagram showing a configuration of a lighting device including the lighting device according to the embodiment of the present disclosure. FIG. 2 is a circuit diagram showing a temperature detection circuit included in the lighting device of the same. FIG. 3 is a diagram for explaining control based on the battery temperature of the lighting device of the above. FIG. 4 is a diagram for explaining control based on the battery voltage of the lighting device of the above. FIG. 5 is a characteristic diagram showing the characteristics of the load current of the lighting device of the same as above. FIG. 6 is a characteristic diagram showing the characteristics of the charging current of the lighting device of the above. FIG. 7 is a graph showing changes in the battery temperature of the lighting device of the same as above. FIG. 8A is a top view of the lighting fixture. FIG. 8B is a bottom view of the lighting fixture. FIG. 8C is a side view of the lighting fixture.

The following embodiments generally relate to lighting devices, luminaires, and luminaires. More specifically, the following embodiments relate to lighting devices, luminaires, and luminaires that use the discharge power of a battery to light a light source.

Each figure described in the embodiment is a schematic view, and the ratio of the size and the thickness of each component does not necessarily reflect the actual dimensional ratio. The configuration described in the following embodiments is only an example of the present disclosure. The present disclosure is not limited to the following embodiments, and various changes can be made depending on the design and the like as long as the effects of the present disclosure can be achieved.

(Embodiment)
(1) Schematic of the lighting device FIG. 1 shows a block configuration of a lighting device 1 including the lighting device 4 of the present embodiment. The lighting device 1 further includes a light source 2 and a battery 3 in addition to the lighting device 4.

The light source 2 includes at least one solid-state light emitting element. For example, the light source 2 has an LED array in which a plurality of LEDs (Light Emitting Diodes) are connected in series as a plurality of solid-state light emitting elements. The light source 2 is not limited to the configuration having an LED as a solid-state light emitting element. The light source 2 may have another solid-state light emitting element such as an organic EL (Organic Electro Luminescence, OEL) or a semiconductor laser diode (LD).

The battery 3 is a rechargeable storage battery (secondary battery) and corresponds to an emergency power source. The battery 3 of the present embodiment is a lithium ion battery. By using the battery 3 as a lithium ion battery, it is possible to achieve both miniaturization and large capacity of the battery 3.

The lighting device 4 charges the battery 3 using external power supplied from an external power source (for example, a commercial power system) 9. Further, the lighting device 4 uses the discharge power of the battery 3 to light the light source 2.

(2) Lighting device (2.1) Configuration of lighting device As shown in FIG. 1, the lighting device 4 includes a filter 4a, a converter 4b, a constant voltage circuit 4c, a charging circuit 4d, a first control power supply circuit 4e, and a second. It includes a control power supply circuit 4f, a lighting circuit 4g, a voltage detection circuit 4h, a temperature detection circuit 4i, and a control circuit 4j.

The converter 4b is supplied with an AC input voltage Vi from an external power supply (for example, a commercial power system) 9 via a filter 4a, and converts the AC input voltage Vi into a DC first intermediate voltage Vd1. The converter 4b is a switching power supply circuit, and is composed of, for example, an isolated flyback converter. The DC first intermediate voltage Vd1 output by the converter 4b is preferably lower than the effective value of the AC input voltage Vi supplied from the external power supply 9. The external power supply 9 of this embodiment is a 100V system or a 200V system commercial power system.

The filter 4a attenuates unnecessary frequency components (noise, harmonic components, etc.) included in the current and voltage in the electric circuit between the external power supply 9 and the converter 4b.

The constant voltage circuit 4c converts the DC first intermediate voltage Vd1 output by the converter 4b into the DC second intermediate voltage Vd2. The constant voltage circuit 4c controls the magnitude of the second intermediate voltage Vd2 to a predetermined constant value.

The charging circuit 4d is configured so that a second intermediate voltage Vd2 is supplied from the constant voltage circuit 4c and a charging current Ic is passed through the battery 3. The operation of the charging circuit 4d is controlled by the control circuit 4j.

The first control power supply circuit 4e converts the second intermediate voltage Vd2 output by the constant voltage circuit 4c into the DC first control voltage Vc1. The first control power supply circuit 4e is preferably composed of a switching power supply circuit or a linear power supply circuit, and preferably steps down the second intermediate voltage Vd2 to the first control voltage Vc1. The first control power supply circuit 4e generates the first control voltage Vc1 when the external power supply 9 is energized and the second intermediate voltage Vd2 is generated. The first control voltage Vc1 is supplied to the control circuit 4j in order to operate the control circuit 4j. That is, the first control voltage Vc1 is a control voltage for operating the control circuit 4j when the external power supply 9 is energized.

The second control power supply circuit 4f converts the DC battery voltage Vb, which is the voltage of the battery 3, into the DC second control voltage Vc2. The second control power supply circuit 4f is preferably composed of a switching power supply circuit or a linear power supply circuit, and preferably lowers the battery voltage Vb to the second control voltage Vc2. The second control voltage Vc2 is supplied to the control circuit 4j in order to operate the control circuit 4j. That is, the second control voltage Vc2 is a control voltage for operating the control circuit 4j in the event of a power failure of the external power supply 9.

In this embodiment, the magnitudes of the first control voltage Vc1 and the second control voltage Vc2 described above are the same. Therefore, in the following description, when the control voltage of the control circuit 4j does not distinguish between the first control voltage Vc1 and the second control voltage Vc2, it is referred to as a control voltage Vc.

The lighting circuit 4g is configured to light the light source 2 with the discharge power of the battery 3. In the present embodiment, the lighting circuit 4g converts the direct current supplied from the battery 3 into a constant current and supplies it to the light source 2 as the load current Io. The operation of the lighting circuit 4g is controlled by the control circuit 4j.

The voltage detection circuit 4h detects the battery voltage Vb and outputs a voltage detection signal Y1 including the detection result of the battery voltage Vb to the control circuit 4j. For example, the voltage detection circuit 4h includes a plurality of resistors connected in series, and outputs the divided voltage obtained by dividing the battery voltage Vb by the plurality of resistors to the control circuit 4j as the voltage detection signal Y1.

The temperature detection circuit 4i detects the temperature of the battery 3 as the battery temperature Tb, and outputs a temperature detection signal Y2 including the detection result of the battery temperature Tb to the control circuit 4j. A circuit example of the temperature detection circuit 4i is shown in FIG. The temperature detection circuit 4i of FIG. 2 includes a series circuit of the resistor R1 and the thermistor TH1. A control voltage Vc (first control voltage Vc1 or second control voltage Vc2) is applied to both ends of the series circuit of the resistor R1 and the thermistor TH1, and the voltage at the connection point between the resistor R1 and the thermistor TH1 is the temperature. It is output to the control circuit 4j as a detection signal Y2.

The control circuit 4j receives the voltage detection signal Y1 and the temperature detection signal Y2, and controls the charging circuit 4d and the lighting circuit 4g. The control circuit 4j preferably includes a computer system. The computer system mainly consists of a processor and a memory as hardware. By executing the program recorded in the memory of the computer system by the processor, at least a part of the functions of the control circuit 4j in the present disclosure is realized. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunications line, and may be recorded on a non-temporary recording medium such as a memory card, optical disk, hard disk drive, etc. that can be read by the computer system. May be provided. The processor of a computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large scale integrated circuit (LSI). The integrated circuit such as IC or LSI referred to here has a different name depending on the degree of integration, and includes an integrated circuit called a system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Further, an FPGA (Field-Programmable Gate Array) programmed after the LSI is manufactured, or a logical device capable of reconfiguring the junction relationship inside the LSI or reconfiguring the circuit partition inside the LSI should also be adopted as a processor. Can be done. A plurality of electronic circuits may be integrated on one chip, or may be distributed on a plurality of chips. A plurality of chips may be integrated in one device, or may be distributed in a plurality of devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

The control circuit 4j has a power failure detection function for detecting a power failure of the external power supply 9. In the present embodiment, the control circuit 4j monitors the first control voltage Vc1, and if the first control voltage Vc1 is equal to or higher than the predetermined voltage, the external power supply 9 is in the energized state and the first control voltage Vc1 is less than the predetermined voltage. If so, it is determined that the external power supply 9 is in a power failure state. The control circuit 4j may detect a power failure of the external power supply 9 based on the magnitude of the first intermediate voltage Vd1 or the second intermediate voltage Vd2.

When the external power supply 9 is energized, the control circuit 4j stops the operation of the lighting circuit 4g and operates the charging circuit 4d. Further, if the external power supply 9 is in a power failure state, the control circuit 4j stops the operation of the charging circuit 4d and operates the lighting circuit 4g. That is, the lighting device 4 turns off the light source 2 when the external power source 9 is energized, and charges the battery 3 using the external power supplied from the external power source 9. Further, the lighting device 4 stops charging the battery 3 when the external power supply 9 has a power failure, and lights the light source 2 by the discharge power of the battery 3.

(2.2) Operation of lighting device As described above, the battery 3 is charged when the external power supply 9 is energized and discharged when the external power supply 9 is out of power. The battery temperature Tb of the battery 3 varies depending on self-heating due to power loss due to the internal resistance of the battery 3, the ambient temperature of the battery 3, and the like. Then, in order to suppress the deterioration of the battery 3 and ensure the safety of the battery 3, it is necessary to control the battery temperature Tb.

Therefore, the control circuit 4j stores each data of the discharge temperature range Wd and the charge temperature range Wc shown in FIG. 3 in advance. The discharge temperature range Wd is a range of the battery temperature Tb that can suppress deterioration of the battery 3 due to discharge and sufficiently secure the safety of the battery 3, and is a range of the temperature T11 or higher and the temperature T12 or lower. The charging temperature range Wc is a range of the battery temperature Tb that can suppress deterioration of the battery 3 due to charging and sufficiently secure the safety of the battery 3, and is a range of the temperature T21 or higher and the temperature T22 or lower. In FIG. 3, the temperature T11 is lower than the temperature T21 and the temperature T12 is higher than the temperature T22. For example, the temperature T11 is −20 ° C., the temperature T12 is 60 ° C., the temperature T21 is 0 ° C., and the temperature T22 is 45 ° C.

Further, when a fire occurs, the temperature around the lighting device 1 rises, and the battery temperature Tb also rises. Therefore, the control circuit 4j stores the data of the forced lighting temperature T3 shown in FIG. 3 in advance. The forced lighting temperature T3 is higher than the temperature T22, which is the maximum value of the charging temperature range Wc.

Further, the upper limit temperature (upper limit temperature for use) of the battery temperature Tb at which the battery 3 can be used is predetermined. Therefore, the control circuit 4j stores the data of the upper limit temperature T4 shown in FIG. 3 in advance, and when the battery temperature Tb exceeds the upper limit temperature T4, the use of the battery 3 is stopped. The upper limit temperature T4 for use is higher than the temperature T12, which is the maximum value of the discharge temperature range Wd, and the forced lighting temperature T3.

Further, the control circuit 4j stores in advance the data of the first voltage threshold value Vb21 and the second voltage threshold value Vb22 shown in FIG. 4 as threshold values to be compared with the battery voltage Vb. The first voltage threshold value Vb21 is larger than the second voltage threshold value Vb22.

The control circuit 4j receives the voltage detection signal Y1 and the temperature detection signal Y2, compares the battery temperature Tb with the above-mentioned discharge temperature range Wd, charging temperature range Wc, forced lighting temperature T3, and upper limit operating temperature T4, and compares the battery temperature Tb with the battery voltage Vb. Is compared with the above-mentioned first voltage threshold Vb21 and second voltage threshold Vb22. Then, the control circuit 4j controls the lighting circuit 4g and the charging circuit 4d based on the comparison result.

(2.2.1) Operation of the lighting device in the event of a power failure of the external power supply The control circuit 4j compares the battery temperature Tb with the above-mentioned discharge temperature range Wd and the upper limit temperature T4 of the battery in the event of a power failure of the external power supply 9. The voltage Vb is compared with the first voltage threshold Vb21 and the second voltage threshold Vb22 described above. Then, the control circuit 4j controls the discharge of the battery 3 and the state of the light source 2 by controlling the lighting circuit 4g based on the comparison result.

Specifically, since the battery 3 is charged when the external power supply 9 is energized, the battery voltage Vb immediately after the power failure of the external power supply 9 is the full charge voltage Vb1 in FIG. Then, when the control circuit 4j operates the lighting circuit 4g and lights the light source 2 by the discharge power of the battery 3, the battery voltage Vb gradually decreases from the full charge voltage Vb1. When the battery voltage Vb drops below the voltage threshold value, the control circuit 4j stops the operation of the lighting circuit 4g (stops the discharge of the battery 3) and turns off the light source 2.

In the present embodiment, the control circuit 4j switches the voltage threshold value according to the battery temperature Tb (see FIGS. 3 and 4).

If the battery temperature Tb is within the discharge temperature range Wd (temperature T11 or higher and temperature T12 or lower), the control circuit 4j sets the voltage threshold to the first voltage threshold Vb21. Then, when the battery voltage Vb drops below the first voltage threshold value Vb21, the control circuit 4j stops the operation of the lighting circuit 4g and turns off the light source 2.

However, when the battery temperature Tb is outside the discharge temperature range Wd (less than the temperature T11 or higher than the temperature T12), the capacity of the battery 3 is reduced as compared with the case where the battery temperature Tb is within the discharge temperature range Wd. As a result, when the battery temperature Tb is outside the discharge temperature range Wd, the lighting time of the light source 2 becomes shorter than when the battery temperature Tb is within the discharge temperature range Wd.

Therefore, if the battery temperature Tb is outside the discharge temperature range Wd (less than the temperature T11 or higher than the temperature T12), the control circuit 4j sets the voltage threshold to the second voltage threshold Vb22 smaller than the first voltage threshold Vb21. Then, when the battery voltage Vb drops below the second voltage threshold value Vb22, the control circuit 4j stops the operation of the lighting circuit 4g and turns off the light source 2. That is, in the control circuit 4j, if the battery temperature Tb is outside the discharge temperature range Wd, even if the battery voltage Vb becomes less than the first voltage threshold Vb21, until the battery voltage Vb drops below the second voltage threshold Vb22. , The battery 3 is discharged and the light source 2 is turned on. Therefore, the lighting device 4 can suppress a decrease in the lighting time of the light source 2 using the discharge power of the battery 3 even if the battery temperature Tb deviates from a predetermined temperature range (discharge temperature range Wd), and the lighting device 4 can suppress the decrease of the lighting time of the light source 2. Sufficient lighting time can be secured.

Further, the control circuit 4j stops the operation of the lighting circuit 4g and turns off the light source 2 if the battery temperature Tb exceeds the operating upper limit temperature T4 at the time of a power failure of the external power supply 9. That is, if the battery temperature Tb exceeds the upper limit temperature T4 when the battery 3 is discharged, the lighting device 4 stops the discharge of the battery 3 regardless of the magnitude of the battery voltage Vb. In other words, the lighting circuit 4g turns off the light source 2 when the battery temperature Tb exceeds the upper limit temperature T4 in the event of a power failure of the external power supply 9. Therefore, the lighting device 4 can improve the safety of the battery 3 at the time of discharging. When the fire alarm detects a fire, the light source 2 may be continuously turned on even if the battery temperature Tb exceeds the upper limit temperature T4.

Further, it is preferable that the control circuit 4j controls the lighting circuit 4g so that the load current Io supplied to the light source 2 is variable according to the magnitude of the battery temperature Tb when the light source 2 is turned on. FIG. 5 illustrates two characteristics Z1 and Z2 as the relationship between the battery temperature Tb and the load current Io. In each of the characteristics Z1 and Z2, the load current Io when the battery temperature Tb is the battery temperature Tb11 is larger than the load current Io when the battery temperature Tb is the battery temperature Tb12 higher than the battery temperature Tb11. In the solid line characteristic Z1, when the battery temperature Tb rises, the load current Io decreases stepwise. In the characteristic Z2 of the alternate long and short dash line, when the battery temperature Tb rises, the load current Io decreases linearly. The relationship between the battery temperature Tb and the load current Io is not limited to the above-mentioned characteristics Z1 and Z2, and when the battery temperature Tb rises, the load current Io decreases in a curved shape, or a stepped shape of two or more steps. It may be a characteristic that decreases to.

(2.2.2) Operation of lighting device when the external power supply is energized The control circuit 4j sets the battery temperature Tb to the above-mentioned charging temperature range Wc, forced lighting temperature T3, and upper limit temperature T4 when the external power supply 9 is energized. Compare with. Then, the control circuit 4j controls the charging and discharging of the battery 3 and the state of the light source 2 by controlling the charging circuit 4d and the lighting circuit 4g based on the comparison result.

Specifically, when the external power source 9 is energized, the control circuit 4j operates the charging circuit 4d to operate the charging circuit 4d if the battery temperature Tb is within the charging temperature range Wc (temperature T21 or higher and temperature T22 or lower). The battery 3 is charged using electric power. Further, the control circuit 4j stops the charging circuit 4d and the battery 3 if the battery temperature Tb is outside the charging temperature range Wc (below the temperature T21 or higher than the temperature T22) when the external power source 9 is energized. Stop charging. That is, when the external power source 9 is energized, the charging circuit 4d stops charging the battery 3 if the battery temperature Tb is outside the charging temperature range Wc. Therefore, the lighting device 4 can improve the safety of the battery 3 at the time of charging.

Further, it is preferable that the control circuit 4j controls the charging circuit 4d so that the charging current Ic of the battery 3 is variable according to the battery temperature Tb when the battery 3 is charged when the external power source 9 is energized. FIG. 6 illustrates two characteristics Z11 and Z12 as the relationship between the battery temperature Tb and the charging current Ic. In each of the characteristics Z11 and Z12, the charging current Ic when the battery temperature Tb is the first battery temperature Tb21 is higher than the charging current Ic when the battery temperature Tb is the second battery temperature Tb22 higher than the first battery temperature Tb21. growing. In the solid line characteristic Z11, when the battery temperature Tb rises, the charging current Ic decreases stepwise. In the characteristic Z2 of the alternate long and short dash line, when the battery temperature Tb rises, the charging current Ic decreases linearly. The relationship between the battery temperature Tb and the charging current Ic is not limited to the above-mentioned characteristics Z11 and Z12, and when the battery temperature Tb rises, the charging current Ic decreases in a curved shape, or a stepped shape of two or more steps. It may be a characteristic that decreases to. Therefore, the lighting device 4 can further improve the safety of the battery 3 at the time of charging.

Further, the control circuit 4j controls the lighting circuit 4g so as to basically turn off the light source 2 when the external power supply 9 is energized. However, in the event of a fire or the like, the external power supply 9 may maintain an energized state without a power failure. Therefore, in the event of a fire, the control circuit 4j operates the lighting circuit 4g to forcibly turn on the light source 2. Specifically, when a fire breaks out, the temperature around the lighting device 1 rises, and the battery temperature Tb also rises. Therefore, the control circuit 4j operates the lighting circuit 4g to forcibly turn on the light source 2 when the battery temperature Tb becomes the forced lighting temperature T3 or higher even when the external power supply 9 is energized. That is, the lighting circuit 4g forcibly turns on the light source 2 when the battery temperature Tb is equal to or higher than the forced lighting temperature T3 when the external power source 9 is energized. The forced lighting temperature T3 is set in advance to a value higher than the temperature T22 on the high temperature side of the charging temperature range Wc and lower than the upper limit temperature T4 (see FIG. 3).

Therefore, the lighting device 4 can turn on the light source 2 in the event of a fire even when the external power source 9 is energized. Further, since the lighting device 4 also uses the temperature detection circuit 4i for detecting the battery temperature Tb as the fire detection circuit, the configuration can be simplified.

When the battery temperature Tb further rises and exceeds the upper limit temperature T4 when the light source 2 is forcibly turned on as described above, the control circuit 4j stops the operation of the lighting circuit 4g and turns off the light source 2. Let me. That is, the lighting circuit 4g turns off the light source 2 when the battery temperature Tb exceeds the predetermined temperature (use upper limit temperature T4) higher than the forced lighting temperature T3. Therefore, the lighting device 4 can improve the safety of the battery 3 at the time of discharging. When the fire alarm detects a fire, the light source 2 may be continuously turned on even if the battery temperature Tb exceeds the upper limit temperature T4.

Further, the control circuit 4j controls the lighting circuit 4g so as to reduce the load current Io supplied to the light source 2 when the increase amount ΔTb of the battery temperature Tb becomes equal to or higher than the increase threshold value when the light source 2 is lit. Is preferable.

FIG. 7 shows an example of a change in the battery temperature Tb when the light source 2 is turned on during a power failure. When the lighting circuit 4g starts outputting the load current Io at time t1, the battery temperature Tb gradually increases from the ambient temperature Tb31 due to self-heating. Then, at the time t2 when the time X1 elapses from the time t1, the battery temperature Tb reaches the saturation temperature Tb32. In this case, the increase amount ΔTb of the battery temperature Tb is (Tb32-Tb31) / X1. For example, the ambient temperature Tb31 = 20 ° C., the saturation temperature Tb32 = 40 ° C., and the time X1 = 4 to 5 hours. Assuming that the time X1 is 4 hours, the normal increase amount ΔTb is 5 ° C./hour (= (40-20) / 4).

On the other hand, when a fire occurs, the battery temperature Tb rises rapidly as compared with the normal time. Therefore, the control circuit 4j stores the increase threshold value in advance, and when the increase amount ΔTb becomes equal to or higher than the increase threshold value when the light source 2 is turned on during a power failure, the control circuit 4j lights up so as to reduce the load current Io supplied to the light source 2. Control the circuit 4g. That is, when the light source 2 is turned on, the lighting circuit 4g reduces the power supplied to the light source 2 when the increase amount ΔTb of the battery temperature Tb becomes equal to or higher than the increase threshold value. The increase threshold value is preferably about 10 times the normal increase amount ΔTb.

When the battery temperature Tb rises rapidly, such as when a fire occurs, the capacity of the battery 3 rapidly decreases. Therefore, as described above, the lighting device 4 reduces the load current Io supplied to the light source 2 when the battery temperature Tb rises rapidly, so that the lighting time of the light source 2 using the discharge power of the battery 3 becomes longer. It is possible to secure a sufficient lighting time of the light source 2.

Further, the control circuit 4j may detect the occurrence of a fire based on the increase amount ΔTb of the battery temperature Tb when the light source 2 is turned off when the external power source 9 is energized. Specifically, the control circuit 4j detects the occurrence of a fire when the increase amount ΔTb of the battery temperature Tb becomes equal to or higher than the increase threshold value while the light source 2 is turned off when the external power supply 9 is energized. In the event of a fire, the control circuit 4j operates the lighting circuit 4g to forcibly turn on the light source 2. Therefore, the lighting device 4 can turn on the light source 2 in the event of a fire even when the external power source 9 is energized. Further, since the lighting device 4 also uses the temperature detection circuit 4i for detecting the battery temperature Tb as the fire detection circuit, the configuration can be simplified.

(3) Structure of lighting fixtures The lighting fixtures E1 shown in FIGS. 8A to 8C are disaster prevention lighting fixtures with built-in batteries installed in buildings such as dwelling units, detached houses, office buildings, and commercial facilities of apartment houses. , An embedded emergency light that is embedded in an embedded hole in the indoor ceiling of a building. However, the lighting equipment is not limited to the embedded emergency light. The lighting fixture may be an exposed type emergency light directly attached to the ceiling, or may be a disaster prevention lighting fixture other than an emergency light such as a guide light.

Hereinafter, an example of the structure of the lighting fixture E1 including the light source 2, the battery 3, and the lighting device 4 will be described with reference to FIGS. 8A to 8C. The lighting fixture E1 according to the present embodiment is attached to a construction material such as a ceiling material or a wall material, and irradiates an evacuation passage or the like with illumination light in the event of a power failure.

As shown in FIGS. 8A to 8C, the luminaire E1 includes a main body 10, a cover 11, and a pair of supports 12.

As shown in FIGS. 8A and 8B, the main body 10 is formed in a bottomed cylindrical shape with one bottom surface (lower surface) open. A pair of supports 12 are attached to the side surface of the main body 10. An annular flange 100 that projects outward is formed at the lower end of the main body 10.

As shown in FIGS. 8A to 8C, the pair of supports 12 are formed in the shape of a long leaf spring. Each support 12 is fixed to the side surface of the main body 10 at one end in the longitudinal direction, and is configured to be flexible so that the other end in the longitudinal direction approaches the bottom surface (upper surface) of the main body 10 (upward). .. That is, the main body 10 has a ceiling material so as to sandwich the ceiling material between the pair of supports 12 inserted into the embedding holes provided in the ceiling and the flange 100 provided on the lower end surface of the main body 10. Supported by the material.

As shown in FIGS. 8A to 8C, the cover 11 is formed in a disk shape larger than the outer diameter of the flange 100 of the main body 10. As shown in FIG. 8B, a circular window hole 110 is provided in the center of the cover 11. The lens 21 of the light source unit 2U penetrates the window hole 110. A pair of mounting springs are attached to the cover 11. As shown in FIG. 8C, the cover 11 is held by the main body 10 in a state where the bottom surface of the main body 10 is closed by a pair of mounting springs.

A light source 2, a battery 3, and a lighting device 4 (see FIG. 1) are attached to the main body 10. More specifically, as shown in FIG. 8B, the light source unit 2U, the battery unit 3U, and the lighting unit 4U are housed in the main body 10. However, the battery unit 3U is housed in the main body 10 so that it can be inserted and removed through the opening on the bottom surface of the main body 10.

As shown in FIG. 8B, the light source unit 2U includes an LED module 20 and a lens 21. The LED module 20 has a substrate on which a light source 2 (see FIG. 1) is mounted, and emits white illumination light such as white, neutral white, or daylight color by applying a voltage in the forward direction. The lens 21 is arranged in front of (below) the LED module 20 and collects the light emitted from the LED module 20.

The battery unit 3U shown in FIG. 8B has a battery 3 including a plurality of elementary batteries (see FIG. 1) and a battery case for accommodating the battery 3. The battery 3 is, for example, a lithium ion battery. The battery case is made of a material having electrical insulation such as synthetic resin in a box shape, and accommodates a plurality of elementary batteries inside.

The lighting unit 4U shown in FIG. 8B has a lighting device 4 (see FIG. 1).

(4) Modification example The lighting fixture is not limited to the disaster prevention lighting fixture having a built-in battery in which the light source 2, the battery 3, and the lighting device 4 are housed in one main body 10 such as the lighting fixture E1 of FIGS. 8A to 8C. The lighting fixture comprises a light source 2, a lighting device 4, and a battery 3 as separate bodies, and the lighting device 4 is a separate power supply type that receives power from a battery 3 installed in the building to turn on the light source 2 in an emergency. It may be a disaster prevention lighting fixture. Further, the control circuit 4j may be separated from the main body, and the control circuit 4j may control charging and discharging of the batteries 3 of each of the plurality of lighting fixtures, and lighting and extinguishing of the light source 2. In this case, the control circuit 4j is preferably installed for each building or each floor of the building.

Further, the battery 3 is not limited to a specific type of secondary battery, and may be, for example, a nickel-hydrogen battery or a nickel-cadmium battery.

Further, the lighting device 4 includes a filter 4a, a converter 4b, a constant voltage circuit 4c, a charging circuit 4d, a first control power supply circuit 4e, a second control power supply circuit 4f, a lighting circuit 4g, a voltage detection circuit 4h, and a temperature detection circuit 4i. And each circuit such as a control circuit 4j. The lighting device 4 may have either a configuration in which each of the above circuits is included in one device or a configuration in which each circuit is distributed to a plurality of devices.

(5) Summary The lighting device (4) of the first aspect according to the above-described embodiment includes a charging circuit (4d), a lighting circuit (4g), a voltage detection circuit (4h), and a temperature detection circuit (4i). And. The charging circuit (4d) charges the battery (3) with the external power supplied from the external power source (9). The lighting circuit (4 g) lights the light source (2) with the discharge power of the battery (3). The voltage detection circuit (4h) detects the battery voltage (Vb) of the battery (3). The temperature detection circuit (4i) detects the battery temperature (Tb) of the battery (3). In the lighting circuit (4 g), when the battery temperature (Tb) is within the discharge temperature range (Wd) at the time of power failure of the external power supply (9), the battery voltage (Vb) becomes less than the first voltage threshold (Vb21). , Turn off the light source (2). In the lighting circuit (4 g), when the battery temperature (Tb) is out of the discharge temperature range (Wd) at the time of power failure of the external power supply (9), the battery voltage (Vb) is lower than the first voltage threshold (Vb21). When the voltage becomes less than the voltage threshold (Vb22), the light source (2) is turned off.

The lighting device (4) described above can suppress a decrease in the lighting time of the light source (2) using the discharge power of the battery (3) even if the battery temperature (Tb) deviates from the predetermined temperature range (Wd). can.

Further, in the lighting device (4) of the second aspect according to the embodiment, in the first aspect, in the lighting circuit (4 g), the battery temperature (Tb) is in the discharge temperature range (Tb) when the light source (2) is lit. It is preferable to turn off the light source (2) when the operating upper limit temperature (T4) higher than the maximum value (T12) of Wd) is exceeded.

The above-mentioned lighting device (4) can improve the safety of the battery (3) at the time of discharging.

Further, in the lighting device (4) of the third aspect according to the embodiment, in the first or second aspect, the charging circuit (4d) has a battery temperature (Tb) when the external power source (9) is energized. If it is out of the charging temperature range (Wc), it is preferable to stop charging the battery (3).

The above-mentioned lighting device (4) can improve the safety of the battery (3) at the time of charging.

Further, in the lighting device (4) of the fourth aspect according to the embodiment, in the third aspect, in the charging circuit (4d), the battery temperature (Tb) is in the charging temperature range when the external power source (9) is energized. If it is within (Wc), the battery (3) is charged, and the charging current (Ic) of the battery (3) when the battery temperature (Tb) is the first battery temperature (Tb21) is set to the battery temperature (Tb). It is preferable that the charge current (Ic) of the battery (3) is larger than the charge current (Ic) of the battery (3) when the second battery temperature (Tb22) is higher than the first battery temperature (Tb21).

The above-mentioned lighting device (4) can further improve the safety of the battery (3) at the time of charging.

Further, in the lighting device (4) of the fifth aspect according to the embodiment, in any one of the first to fourth aspects, the lighting circuit (4 g) is a battery when the external power source (9) is energized. When the temperature (Tb) is equal to or higher than the forced lighting temperature (T3), it is preferable to turn on the light source (2).

The lighting device (4) described above can light the light source (2) in the event of a fire even when the external power supply (9) is energized. Further, since the lighting device (4) also uses the temperature detection circuit (4i) for detecting the battery temperature (Tb) as the fire detection circuit, the configuration can be simplified.

Further, in the lighting device (4) of the sixth aspect according to the embodiment, in the fifth aspect, the lighting circuit (4 g) has a predetermined temperature (T4) in which the battery temperature (Tb) is higher than the forced lighting temperature (T3). If it exceeds, it is preferable to turn off the light source (2).

The above-mentioned lighting device (4) can improve the safety of the battery (3) at the time of discharging.

Further, in the lighting device (4) of the seventh aspect according to the embodiment, in any one of the first to sixth aspects, when the lighting circuit (4 g) lights the light source (2), When the increase amount (ΔTb) of the battery temperature (Tb) becomes equal to or higher than the increase threshold value, it is preferable to reduce the power supplied to the light source (2).

In the above-mentioned lighting device (4), the lighting time of the light source (2) using the discharge power of the battery (3) can be made longer, and the lighting time of the light source (2) can be sufficiently secured.

Further, the lighting device (1) of the eighth aspect according to the embodiment includes a lighting device (4), a light source (2), and a battery (3) of any one of the first to seventh aspects. Be prepared.

The above-mentioned lighting device (1) can suppress a decrease in the lighting time of the light source (2) using the discharge power of the battery (3) even if the battery temperature (Tb) deviates from the predetermined temperature range (Wd). can.

Further, in the lighting device (1) of the ninth aspect according to the embodiment, in the eighth aspect, the battery (3) is preferably a lithium ion battery.

The above-mentioned lighting device (1) can achieve both miniaturization and large capacity of the battery (3).

Further, the luminaire (E1) of the tenth aspect according to the embodiment includes the luminaire (1) of the eighth or ninth aspect, the lighting device (4), the light source (2), and the battery (3). It comprises a body (10) to which at least one is attached.

The above-mentioned luminaire (E1) can suppress a decrease in the lighting time of the light source (2) using the discharge power of the battery (3) even if the battery temperature (Tb) deviates from the predetermined temperature range (Wd). can.

E1 Lighting equipment 1 Lighting equipment 2 Light source 3 Battery 4 Lighting equipment 4d Charging circuit 4g Lighting circuit 4h Voltage detection circuit 4i Temperature detection circuit 9 External power supply Vb Battery voltage Vb21 1st voltage threshold Vb22 2nd voltage threshold Wd Discharge temperature range Wc Charging temperature Range Tb Battery temperature T3 Forced lighting temperature T4 Upper limit temperature for use (predetermined temperature)
Maximum value of T12 discharge temperature range Tb21 1st battery temperature Tb22 2nd battery temperature Ic Charging current ΔTb increase

Claims (10)

A charging circuit that charges the battery with external power supplied from an external power source,
A lighting circuit that lights the light source with the discharge power of the battery,
A voltage detection circuit that detects the battery voltage of the battery and
A temperature detection circuit for detecting the battery temperature of the battery is provided.
The lighting circuit is provided in the event of a power failure of the external power supply.
When the battery temperature is within the discharge temperature range and the battery voltage becomes less than the first voltage threshold value, the light source is turned off.
A lighting device that turns off the light source when the battery temperature is outside the discharge temperature range and the battery voltage is less than the second voltage threshold value lower than the first voltage threshold value. The lighting circuit according to claim 1, wherein the lighting circuit turns off the light source when the battery temperature exceeds the upper limit of use temperature higher than the maximum value in the discharge temperature range when the light source is lit. The lighting device according to claim 1 or 2, wherein the charging circuit stops charging the battery if the battery temperature is out of the charging temperature range when the external power source is energized. The charging circuit charges the battery when the battery temperature is within the charging temperature range when the external power supply is energized, and charges the battery when the battery temperature is the first battery temperature. The lighting device according to claim 3, wherein the battery temperature is larger than the charging current of the battery when the second battery temperature is higher than the first battery temperature. The lighting circuit is any one of claims 1 to 4 for lighting the light source if the battery temperature is equal to or higher than the forced lighting temperature when the external power supply is energized. The lighting circuit according to claim 5, wherein the light source is turned off when the battery temperature exceeds a predetermined temperature higher than the forced lighting temperature. The lighting circuit is any one of claims 1 to 6 that reduces the electric power supplied to the light source when the increase amount of the battery temperature becomes equal to or higher than the increase threshold value when the light source is lit. The lighting device according to any one of claims 1 to 7 and
With the light source
A lighting device comprising the battery. The lighting device according to claim 8, wherein the battery is a lithium ion battery. With the lighting device of claim 8 or 9.
A luminaire comprising the lighting device, the light source, and a main body to which at least one of the batteries is attached.

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