WO2015079617A1

WO2015079617A1 - Illumination device

Info

Publication number: WO2015079617A1
Application number: PCT/JP2014/005315
Authority: WO
Inventors: 圭一郎奥浦; 佐々木　工輔; 勇錦蘇
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2013-11-29
Filing date: 2014-10-20
Publication date: 2015-06-04
Also published as: TW201531163A; JP2015106508A; JP6340710B2; TWI542255B

Abstract

The objective of the present invention is to provide an illumination device that has a wide input-voltage tolerance range and that reduces stress applied to a lighting circuit and a control unit. In order to achieve the aforementioned objective, this illumination device (1) is provided with: a lighting circuit (6) that lights up LEDs (5a, 5b); a control circuit (7); and a switching power supply unit (18). When the surrounding brightness becomes darker than a predetermined value, the control circuit (7) controls the lighting circuit (6) so as to light up the LED (5a) with power from a commercial power supply. When a lighting operation is performed by using an operation unit, the control circuit (7) controls the lighting circuit (6) so as to light up the LED (5b) with power from a battery (12). The switching power supply unit (18) converts, by performing switching, a voltage which has been input from an electric outlet via a plug into a direct-current voltage having a predetermined voltage value, and supplies the same to the lighting circuit (6) and the control circuit (7).

Description

lighting equipment

The present invention generally relates to a lighting fixture, and more particularly to a night light that is plugged into a commercial power outlet and illuminates the floor of a passageway.

Conventionally, there has been a foot lamp that is inserted into an outlet on the wall surface of the passage and detects the darkness of the surroundings and the passage of people to illuminate the foot of the passage (for example, see Japanese Utility Model Registration No. 3108623; ").

The footlamp described in Document 1 includes a primary battery, and can be used as a portable light that is removed from an outlet and uses the primary battery as a power source.

Since the footlight described in Document 1 can be used as a portable light, there is a possibility that the user may take the footlight overseas, for example, when traveling abroad or on a business trip. When the user connects the footlight described in Document 1 to an outlet of an overseas commercial power supply, an excessive voltage different from the rated voltage of the Japanese commercial power supply is supplied to the footlight, and the control circuit and lighting circuit of the footlight Could be stressed.

This invention is made in view of the said subject, and it aims at providing the lighting fixture which reduces the stress added to a lighting circuit and a control part because the allowable range of an input voltage is wide.

In order to solve the above-described problem, the lighting fixture of the present invention includes a plug, a lighting circuit, an operation unit, an illuminance conversion unit, a control unit, and a switching power supply unit. The plug is detachably connected to a commercial power outlet. The lighting circuit lights the lighting load. The operation unit is operated to turn on or off the illumination load. In the illuminance conversion unit, the size of the output changes according to the ambient brightness. The control unit controls the lighting circuit to turn on the lighting load with the power supplied from the outlet through the plug when the brightness obtained from the output of the illuminance conversion unit becomes darker than a predetermined value. . When a lighting operation is performed using the operation unit, the control unit controls the lighting circuit so that the lighting load is turned on with power supplied from a battery. The switching power supply unit converts a voltage input from the outlet through the plug into a DC voltage having a predetermined voltage value, and supplies the DC voltage to the lighting circuit and the control unit.

FIG. 1A is a schematic circuit block diagram of a lighting fixture according to the embodiment, and FIG. 1B is a schematic circuit block diagram for explaining a main part of the lighting fixture according to the embodiment. It is a front view explaining the principal part of the lighting fixture which concerns on embodiment. It is a right sectional view explaining the important section of the lighting fixture concerning an embodiment. It is a top view of the lighting fixture which concerns on embodiment. It is a left view of the lighting fixture which concerns on embodiment. It is a front view of the lighting fixture which concerns on embodiment. It is a disassembled perspective view explaining the principal part of the lighting fixture which concerns on embodiment. 8A to 8G are diagrams for explaining the operation of the main part of the lighting fixture in the present embodiment.

Hereinafter, the lighting apparatus of the present embodiment will be described with reference to the drawings. In the following description, the x-axis direction shown in FIG. 2 is defined as the left-right direction, and the y-axis direction is defined as the up-down direction. Further, the description will be made assuming that the z-axis direction shown in FIG.

The lighting apparatus of the present embodiment is connected to an outlet provided on a wall surface, for example, and is used as a foot lamp that illuminates the floor surface when the surroundings become dark. The luminaire includes a battery, and can be used as a handy light (portable light) that is removed from an outlet and uses the battery as a power source.

As shown in FIG. 1A, the lighting fixture 1 of the present embodiment includes a switching power supply unit 18, a lighting circuit 6, LEDs (Light Emitting Diodes) 5 a and 5 b (lighting load), an LED 9 a (lighting unit 9), A control circuit 7 (control unit) and a battery 12 are provided. Furthermore, the luminaire 1 includes a power failure detection circuit 11 and a voltage measurement circuit 14.

The power failure detection circuit 11 detects whether or not the commercial power supply 17 is supplied by monitoring the voltage input to the primary side of the switching power supply unit 18. The power failure detection circuit 11 outputs a signal SN1 to the control circuit 7 when the commercial power supply 17 is supplied.

The lighting circuit 6 includes a regulator 15, a booster circuit 16, and switches SW1 to SW3. A DC voltage is input to the regulator 15 from either the switching power supply unit 18 or the booster circuit 16. The regulator 15 suppresses the fluctuation of the input voltage and outputs it to the control circuit 7 and the

LEDs

5a, 5b, 9a. Note that, for example, a diode (not shown) for preventing a backflow of current is connected between the regulator 15 and the switching power supply unit 18 and between the regulator 15 and the booster circuit 16.

The lighting circuit 6 is connected to

LEDs

5a and 5b for illumination and an LED 9a provided for notifying a decrease in the remaining capacity of the battery 12. The LED 5a is connected to the regulator 15 via the switch SW1. Similarly, the LED 5b is connected to the regulator 15 via the switch SW2, and the LED 9a is connected to the regulator 15 via the switch SW3. The switches SW1 to SW3 are turned on / off by the control circuit 7, respectively.

The booster circuit 16 is composed of, for example, a boost chopper circuit, and boosts the voltage of the battery 12 and outputs the boosted voltage to the regulator 15. The operation of the booster circuit 16 is controlled by a signal SN2 input from the control circuit 7.

The battery 12 is an AA type primary battery such as a manganese dry battery or an alkaline / manganese dry battery, and is connected to the primary side of the booster circuit 16.

The luminaire 1 includes a voltage measurement circuit 14 that measures the output voltage of the battery 12. The voltage measurement circuit 14 performs A / D conversion on the voltage of the battery 12 every predetermined period and outputs it to the control circuit 7.

The control circuit 7 includes, for example, a microcomputer, and the lighting circuit 6 can be controlled by executing a built-in program. A DC voltage is input from the regulator 15 to the power supply terminal VDD of the control circuit 7.

The control circuit 7 is connected with a changeover switch 31, a lighting switch 8 (operation unit), and a brightness sensor 3a (illuminance conversion unit).

The brightness sensor 3a is composed of an element (for example, a photodiode, a phototransistor, etc.) that detects ambient brightness. The output current of the brightness sensor 3a changes according to the surrounding brightness.

The changeover switch 31 is a slide switch that is movable in the left-right direction, and is a switch for switching whether to enable the night light function. When the changeover switch 31 is set to enable the night light function and the ambient brightness obtained from the output current of the brightness sensor 3a becomes darker than a predetermined value, the control circuit 7 turns on the switch SW1. The LED 5a is turned on. When the changeover switch 31 is set to enable the night light function and the ambient brightness obtained from the output current of the brightness sensor 3a becomes brighter than a predetermined value, the control circuit 7 turns off the switch SW1. Then, the LED 5a is turned off. In addition, you may provide a hysteresis in the threshold value (above predetermined value) which switches on / off of LED5a. By providing hysteresis in the threshold value, it is possible to suppress the lighting and extinguishing of the LED 5a from being repeated in a short cycle when the ambient brightness changes and approaches a predetermined value.

On the other hand, in a state where the changeover switch 31 is set so as to disable the night light function, even if the ambient brightness obtained from the output current of the brightness sensor 3a becomes darker than a predetermined value, the control circuit 7 Continue to keep SW1 off.

The power failure detection circuit 11, the voltage measurement circuit 14, the lighting circuit 6, the control circuit 7, and the switching power supply unit 18 are each mounted on a main board 10 to be described later.

As shown in FIG. 1B, the switching power supply unit 18 includes a switching IC (Integrated Circuit) 18a, rectifying and smoothing

circuits

18b and 18e, a transformer 18f having a primary coil 18c and secondary coils 18d and 18g. The input terminal of the switching power supply unit 18 is electrically connected to a plug 4 that is detachably connected to a commercial power outlet. The switching power supply unit 18 is a flyback converter type switching power supply, and converts an AC voltage input through the plug 4 into a DC voltage having a predetermined voltage value and outputs the DC voltage.

The rectifying / smoothing circuit 18b includes a full-wave rectifying circuit (not shown) that performs full-wave rectification of the AC voltage and a filter circuit (not shown) that smoothes the rectified output. The input terminal of the rectifying / smoothing circuit 18 b is connected to the plug 4. Between the output terminals of the rectifying / smoothing circuit 18b, a semiconductor switch (not shown) provided in the switching IC 18a and a primary coil 18c are connected in series. The rectifying / smoothing circuit 18b performs full-wave rectification on the AC voltage input from the plug 4, and smoothes and outputs the rectified output.

The primary coil 18c constitutes the primary side of the transformer 18f, and secondary coils 18d and 18g whose winding directions are opposite to those of the primary coil 18c are provided on the secondary side of the transformer 18f. A rectifying / smoothing circuit 18e is connected between the output terminals of the secondary coil 18d. A switching IC 18a is connected between the output terminals of the secondary coil 18g.

The rectifying / smoothing circuit 18e includes a half-wave rectifying circuit (not shown) for half-wave rectifying the voltage across the secondary coil 18d, and a filter circuit (not shown) for smoothing the output. The rectifying / smoothing circuit 18e performs half-wave rectification on the pulsed voltage generated between both ends of the secondary coil 18d, and then smoothes the converted voltage into a substantially constant DC voltage.

The switching IC 18a is an IC in which a semiconductor switch (not shown) for turning on / off between the rectifying / smoothing circuit 18b and the primary coil 18c and a control circuit for controlling switching of the semiconductor switch are integrated. The semiconductor switch includes, for example, a MOSFET (metal-oxide-semiconductor field-effect transistor), a bipolar transistor, or the like. The switching IC 18a has a secondary coil 18g that detects a voltage generated in the secondary coil 18d. The switching IC 18a performs PWM (Pulse Width Modulation) control of the semiconductor switch so that the output voltage Vdc of the rectifying and smoothing circuit 18e estimated from the voltage across the secondary coil 18g becomes a predetermined voltage value.

Here, the operation of the switching power supply unit 18 will be described with reference to FIG.

When the plug 4 is inserted into an outlet (not shown) of a commercial power source 17 provided on a wall or the like, an AC voltage supplied from the commercial power source 17 is input to the rectifying and smoothing circuit 18b. The rectifying / smoothing circuit 18b performs full-wave rectification on the AC voltage (see FIG. 8A) supplied from the commercial power supply 17 (see FIG. 8B), smoothes the rectified output, and converts it to a substantially constant DC voltage (see FIG. 8). 8C).

The switching IC 18a detects the voltage value of the secondary coil 18d from the fed back voltage value of the secondary coil 18g, and performs PWM control of the semiconductor switch (not shown) so that the output voltage Vdc becomes a predetermined voltage value. A pulse voltage (see FIG. 8D) is applied to the primary coil 18c by PWM control of the semiconductor switch.

In the secondary coil 18d, a pulsed AC voltage is generated by reducing the input voltage according to the winding ratio (see FIG. 8E). The rectifying / smoothing circuit 18e performs half-wave rectification on the voltage across the secondary coil 18d (see FIG. 8F), and then outputs an output voltage Vdc obtained by smoothing the rectified output (see FIG. 8G).

Based on the voltage value of the secondary coil 18d detected from the fed back voltage value of the secondary coil 18g, the switching IC 18a performs PWM control of the semiconductor switch so that the output voltage Vdc becomes a DC voltage having a predetermined voltage value. Therefore, the allowable range of input voltage is expanded. When power is supplied from the commercial power supply 17 having a different rated voltage to the switching power supply unit 18, the switching power supply unit 18 performs a switching operation so that the output voltage becomes a predetermined voltage value. Therefore, it is difficult to apply an excessive voltage to the lighting circuit 6 and the control circuit 7, and stress applied to the lighting circuit 6 and the control circuit 7 is reduced.

Next, the structure of the lighting fixture 1 will be described with reference to FIGS.

As shown in FIGS. 5 and 6, the container body 2 includes a rectangular box-shaped body 22 having an opening on the front surface side, and a cover 21 having a front surface formed in a rectangular shape and covering the opening on the front surface of the body 22.

In the upper part of the front surface of the cover 21, an overhanging portion 21 a that protrudes to the front side of the lower part of the cover 21 is formed. An opening 21c that opens in a rectangular shape is provided on the front surface portion of the cover 21 excluding the protruding portion 21a, and the light guide plate 13 is attached to the cover 21 so as to close the opening 21c.

The light guide plate 13 includes a light extraction portion 13a (outgoing surface) having a rectangular front surface and a light incident portion 13b (incident surface) (see FIG. 2) formed so as to protrude upward from the upper surface of the light extraction portion 13a. ing. The light incident part 13b is disposed inside the projecting part 21a, and is disposed such that the incident surface (upper side surface in the present embodiment) of the light incident part 13b faces each of the

LEDs

5a and 5b. The light incident part 13b guides the light emitted from the

LEDs

5a and 5b to the incident surface of the light incident part 13b to the light extraction part 13a. The front surface of the light extraction portion 13a is formed to be flush with the front surface of the overhang portion 21a, and is exposed to the outside from the opening portion 21c. A light diffusing unit 19 for diffusing light passing through the light extracting unit 13a is provided on the back surface of the light extracting unit 13a, and the light diffused by the light diffusing unit 19 is radiated to the outside from the front surface of the light extracting unit 13a. .

As shown in FIGS. 2 and 3, a sub-board 51 is disposed inside the overhanging portion 21a. The sub board 51 is attached near the upper surface inside the container body 2 so as to be parallel to the upper surface of the container body 2, and is electrically connected to the main board 10.

The sub-board 51 is mounted with

LEDs

5a and 5b for illumination, LED 9a for notification, brightness sensor 3a, and changeover switch 31. The LED 9a is mounted on one end side (left side in the present embodiment) of the upper surface of the sub-board 51. The brightness sensor 3a is mounted on the other end side (right side in the present embodiment) of the upper surface of the sub-board 51. The changeover switch 31 is mounted at the center of the upper surface of the sub-board 51, and the

LEDs

5 a and 5 b are mounted on the lower surface of the sub-board 51, respectively. The LED 5a emits light when used as a night light, and the color temperature of the light emission color of the LED 5a is a light bulb color of about 2700 to 3000K. The LED 5b emits light when used as a handy light, and the color temperature of the light emission color of the LED 5b is about 4000K white. In addition, the color temperature of the emitted light of LED5a, 5b is not limited to said color temperature, respectively, It can change suitably according to a use application.

As shown in FIG. 4, holes 21 b are provided on the upper surface of the container body 2 so as to expose the

translucent windows

3 b and 9 b and the switching knob 32 covered on the operation part of the selector switch 31.

The translucent window 9b is formed of a translucent material such as acrylic resin, for example, and is provided in a portion facing the LED 9a on the upper surface of the cover 21 and exposed above the body 2. When the LED 9a is turned on, the light of the LED 9a is transmitted through the transparent window 9b and radiated from the upper surface of the cover 21 to the outside. Therefore, when the remaining capacity of the battery 12 is reduced and the LED 9a is turned on with the plug 4 connected to the outlet, the light of the LED 9a is emitted from the light transmitting window 9b. In this embodiment, the lighting part 9 is comprised by LED9a and the translucent window 9b.

The translucent window 3b is formed of a translucent material such as acrylic resin, for example, is provided at a portion facing the brightness sensor 3a on the upper surface of the cover 21, and is exposed on the upper side of the body 2. When light around the body 2 passes through the transparent window 3b and enters the brightness sensor 3a, the output current of the brightness sensor 3a changes according to the ambient brightness.

The change knob 32 is provided so as to be exposed to the outside through the hole 21b on the upper surface of the container body 2 in a state where the operation portion of the changeover switch 31 is covered. The selector switch 31 is switched by sliding the selector knob 32 in the left-right direction. When the switching knob 32 is set to one end side in the sliding direction (right side in FIG. 4 in this embodiment), the night light function is enabled, and the switching knob 32 is set to the other end side in the sliding direction (in FIG. 4 in this embodiment). If set to the left side of), the night light function is disabled.

On one side surface of the container body 2 in the left-right direction (in this embodiment, the left side surface of the container body 2), a lighting switch 8 is provided. The lighting switch 8 is a switch for turning on / off the LED 5b in a state where power is not supplied from the commercial power source 17. The lighting switch 8 is constituted by a push switch, for example. The control circuit 7 switches on / off of the LED 5b each time the lighting switch 8 is pressed in a state where power is not supplied from the commercial power source 17. The lighting switch 8 is not limited to a push switch, and may be an appropriate type of switch that maintains the state after switching.

The plug 4 is attached to the back of the body 22. As shown in FIG. 5, the plug 4 is rotatably supported between a position where the tip end portion of the plug 4 faces the back direction of the body 22 and a position which faces the upper surface direction. When the plug 4 is rotated in the direction of arrow A1 in FIG. 5 with the plug 4 pulled out from the outlet (not shown) of the commercial power supply 17 so that the tip of the plug 4 faces the upper surface, the body 22 is provided. The plug 4 can be stored in the groove 41.

As shown in FIG. 7, a storage recess 23 a that stores the battery 12 is provided on the lower side of the back surface of the container body 2. The housing recess 23 a is closed by a lid 23 b that is detachably attached to the body 22. The battery 12 is a readily available primary battery, and is housed in the housing recess 23 a so that the longitudinal direction of the battery 12 is along the left-right direction of the container 2.

As shown in FIG. 3, the main board 10 is accommodated inside the container body 2. Circuit components constituting the lighting circuit 6, the control circuit 7, the switching power supply unit 18, the power failure detection circuit 11, and the voltage measurement circuit 14 are mounted on the main board 10. The main board 10 is electrically connected to the sub board 51, the battery 12, and the plug 4, respectively.

Here, operation | movement of the lighting fixture 1 of this embodiment is demonstrated.

First, the operation when the switching knob 32 is switched to the position for enabling the night light function will be described.

The container 2 is attached to a wall surface (not shown) in a state where the plug 4 is connected to an outlet (not shown) of the commercial power source 17. The switching power supply unit 18 converts the AC voltage supplied from the commercial power supply 17 into a predetermined DC voltage and outputs it to the lighting circuit 6. The power failure detection circuit 11 monitors the voltage input to the primary side of the switching power supply unit 18, and outputs the signal SN <b> 1 to the control circuit 7 when the commercial power supply 17 is supplied. When the signal SN1 is input, the control circuit 7 stops the boosting operation of the boosting circuit 16. Each of the control circuit 7 and the lighting circuit 6 operates with electric power supplied from the commercial power supply 17.

If the ambient brightness obtained from the output current of the brightness sensor 3a becomes darker than a predetermined value while power is supplied from the commercial power supply 17, the control circuit 7 turns on the switch SW1 to automatically turn on the LED 5a. Turn on. The light emitted from the LED 5a to the light incident portion 13b is diffused by the light diffusing portion 19 and emitted from the light extraction portion 13a to the outside. The light emitted from the light extraction portion 13a of the light guide plate 13 illuminates the floor surface (not shown) around the luminaire 1. Since the emission color of the LED 5a is a light bulb color, it is difficult to feel dazzling even if the floor surface is illuminated at night. On the other hand, when the ambient brightness obtained from the output current of the brightness sensor 3a becomes brighter than a predetermined value while power is supplied from the commercial power supply 17, the control circuit 7 turns off the switch SW1 and turns on the LED 5a. Turn off automatically.

On the other hand, when the selector switch 31 is switched to the position where the night light function is disabled, the control circuit 7 switches the switch even when the ambient brightness obtained from the output current of the brightness sensor 3a becomes darker than a predetermined value. SW1 is kept off, and the LED 5a is kept off.

Next, the operation of the lighting fixture 1 when operating with the power supplied by the battery 12 will be described.

When the plug 4 is pulled out from the outlet (not shown) of the commercial power supply 17 or when a power failure occurs, the power failure detection circuit 11 stops outputting the signal SN1. When power is not supplied from the plug 4, a switching circuit (not shown) switches the power source from the commercial power source 17 to the battery 12 and supplies the control circuit 7 with the power of the battery 12. When the signal SN1 is no longer input from the power failure detection circuit 11, the control circuit 7 causes the booster circuit 16 to perform a boost operation and causes the booster circuit 16 to output a predetermined DC voltage to the regulator 15. That is, the control circuit 7 and the lighting circuit 6 operate with electric power supplied from the battery 12. After operating the booster circuit 16, the control circuit 7 turns on the switch SW2 to light the LED 5b. Therefore, when a power failure occurs with the lighting fixture 1 connected to the outlet, the LED 5b is automatically turned on, and the light emitted from the light extraction portion 13a of the light guide plate 13 is irradiated in the irradiation direction. Since the light emission color of the LED 5b is white, when the lighting fixture 1 is used as a handy light, the visibility is improved and the surrounding situation is more easily recognized.

When the lighting switch 8 is turned off while the LED 5b is lit with the power supplied from the battery 12, the control circuit 7 turns off the switch SW2 to turn off the LED 5b. Similarly, when the lighting switch 8 is turned on while operating with the power supplied from the battery 12, the control circuit 7 turns on the switch SW2 to light the LED 5b and extract the light from the light guide plate 13. Light is emitted from the portion 13a.

By the way, even if the control circuit 7 and the lighting circuit 6 are each operated with power supplied from the commercial power supply 17, the remaining capacity of the battery 12 gradually decreases due to, for example, natural discharge. When the voltage value of the battery 12 output from the voltage measurement circuit 14 falls below the voltage value that is the notification level, the control circuit 7 determines that the remaining capacity of the battery 12 is below the predetermined capacity that is the notification level, and turns on the switch SW3. Then, the LED 9a is turned on. When the LED 9a is turned on, the light of the LED 9a is transmitted through the light transmission window 9b and radiated to the outside from the upper side of the body 2. Since the user can easily recognize the light of the LED 9a when viewed from the upper side of the container body 2, the user can easily recognize the decrease in the remaining capacity of the battery, and can grasp that the battery 12 of the built-in battery 12 needs to be replaced. .

Even when the luminaire 1 operates with the electric power supplied from the battery 12, the control circuit 7 may light the LED 9a when the output voltage of the battery 12 falls below a voltage value that is a notification level. In order to turn on the LED 9a while further reducing the power consumption of the battery 12, the control circuit 7 may turn on the LED 9a for a predetermined period and turn off the LED 9a, or blink the LED 9a at a predetermined cycle, for example.

As described above, the luminaire 1 of the present embodiment includes the plug 4, the lighting circuit 6, the lighting switch 8 (operation unit), the brightness sensor 3a (illuminance conversion unit), and the control circuit 7 (control unit). ) And a switching power supply unit 18. The plug 4 is detachably connected to the outlet of the commercial power source 17. The lighting circuit 6 lights the illumination load (

LEDs

5a and 5b). The lighting switch 8 (operation unit) is operated to turn on or off the lighting load (LED 5a). In the brightness sensor 3a (illuminance conversion unit), the magnitude of the output changes according to the surrounding brightness. When the brightness obtained from the output of the brightness sensor 3a (illuminance conversion unit) becomes darker than a predetermined value, the control circuit 7 (control unit) uses the power supplied from the outlet via the plug 4 to illuminate the load (LED 5a). The lighting circuit 6 is controlled so as to light up. The control circuit 7 (control unit) controls the lighting circuit 6 so that the lighting load (LED 5b) is lit by the power supplied from the battery 12 when the lighting operation is performed using the lighting switch 8 (operation unit). The switching power supply unit 18 converts the voltage input from the outlet through the plug 4 into a DC voltage having a predetermined voltage value, and supplies it to the lighting circuit 6 and the control circuit 7 (control unit).

The switching power supply unit 18 having a switching power supply converts the voltage input from the commercial power supply 17 via the plug 4 into a DC voltage having a predetermined voltage value. Therefore, the allowable range of the input voltage is widened, and a predetermined voltage is applied to the lighting circuit 6 and the control circuit 7, so that stress applied to the lighting circuit 6 and the control circuit 7 can be reduced.

In addition, although the switching power supply unit 18 in the present embodiment is configured by a flyback converter type switching power supply, it is not intended to be limited to the flyback converter type. The switching power supply unit 18 is not limited to the feedback control of the input voltage to the primary coil 18c based on the voltage value of the secondary coil 18d detected from the voltage value of the secondary coil 18g. The switching power supply unit 18 may feedback control the input voltage to the primary coil 18c based on the voltage value of the output voltage Vdc of the rectifying and smoothing circuit 18e.

The switching power supply unit 18 of the present embodiment includes the switching IC 18a that detects the voltage value of the secondary coil 18d and feedback-controls the input voltage to the primary coil 18c, but may be a switching power supply that does not perform feedback control. . That is, the switching power supply unit 18 may be any appropriate switching power supply that can output a DC voltage having a predetermined voltage value even when power is supplied from commercial power supplies having different rated voltages.

In recent years, the performance of primary batteries has been improved and long-life primary batteries have been commercialized. Therefore, in the lighting fixture 1 of this embodiment, primary batteries that are more readily available than secondary batteries are used for the batteries 12. ing. However, since the battery 12, which is a primary battery, cannot be charged, the remaining capacity of the battery 12 gradually decreases due to natural discharge or the like. Therefore, the user may not be aware that the remaining capacity of the battery 12 is reduced, and there is a possibility that the lighting fixture 1 cannot be used sufficiently when the lighting fixture 1 is used as a handy light. Since the lighting fixture 1 of this embodiment lights the lighting part 9 and alert | reports the fall of the remaining capacity of the battery 12, it becomes easy for a user to recognize the fall of the remaining capacity of the battery 12. FIG.

Although the lighting part 9 in this embodiment is comprised by LED9a and the translucent window 9b, what is necessary is just the structure from which light is radiated | emitted from the upper side of the container 2, for example, the bullet-type LED mounted in the sub board | substrate 51 May be exposed on the upper side of the body 2.

The brightness sensor 3a in the present embodiment is composed of an element whose current value changes according to the illuminance, but may be a photoresistor whose resistance value changes according to the illuminance, for example.

The lighting load in the present embodiment is composed of two

LEDs

5a and 5b, but the number of LEDs is not limited to two, and may be one or more, and the type of lighting load is not limited to LEDs. Further, the control circuit 7 of the present embodiment turns on the LED 5a with the power supplied from the secondary side of the switching power supply unit 18 and turns on the LED 5b with the power supplied from the battery 12, but the power supply source changes. It is not limited to lighting a different illumination load.

The battery 12 in the present embodiment is an AA type primary battery, but may be a type other than the AA type or a charged secondary battery (for example, a nickel-hydrogen rechargeable battery).

The voltage measurement circuit 14 in this embodiment measures the output voltage in order to detect the remaining capacity of the battery 12, but is not limited to the measurement of the output voltage, and may be an appropriate method that can detect the remaining capacity of the battery. .

Claims

A plug that is detachably connected to a commercial power outlet,
A lighting circuit for lighting the lighting load;
An operation unit operated to turn on or off the illumination load;
An illuminance converter that changes the output size according to the ambient brightness;
When the brightness obtained from the output of the illuminance conversion unit becomes darker than a predetermined value, the lighting circuit is controlled to turn on the lighting load with power supplied from the outlet via the plug, and the operation unit A controller that controls the lighting circuit to light the lighting load with power supplied from a battery when a lighting operation is performed using
A lighting apparatus comprising: a switching power supply unit that converts a voltage input from the outlet through the plug into a DC voltage having a predetermined voltage value and supplies the DC voltage to the lighting circuit and the control unit. .