Lighting devices and emergency lighting equipment

Abstract

To provide a lighting device and emergency lighting equipment capable of suppressing an increase in the time required to detect a power outage, even when such an outage occurs in a regular power supply during an inspection or while lights are always turned off.SOLUTION: In a lighting device 1, a dummy load circuit 16 is applied with an intermediate voltage (Vi) of a smoothing capacitor (C1), making it possible to switch between a conduction state in which a dummy current (Id) generated by the intermediate voltage (Vi) flows and a cutoff state in which the dummy current (Id) is cut off. A control circuit 14 controls a dummy load circuit 16. The control circuit 14 switches the dummy load circuit 16 from the cutoff state to the conduction state when at least one of a charging circuit 12 and a regular lighting circuit 10 stops operating.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a lighting device and an emergency lighting device. [Background technology]

[0002] The lighting device of Patent Document 1 includes a normal lighting circuit, a charging circuit, and an emergency lighting circuit. The normal lighting circuit lights the normal light source using a normal power source. The charging circuit charges a storage battery. The emergency lighting circuit lights the emergency light source with power supplied from the storage battery in the event of a power outage of the normal power source. When the lighting device receives an input of a trigger signal to start an inspection operation, it stops the charging circuit and operates the emergency lighting circuit to light the second light source, thereby performing the inspection operation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-96938 Summary of the Invention [Problem to be solved by the invention]

[0004] In lighting devices such as those described in Patent Document 1, there was a problem in that if the normal power supply fails during inspection when the charging circuit and normal lighting circuit are stopped, or during normal lighting-out when the normal lighting circuit is stopped and the light source is turned off, it takes a long time to detect the power failure.

[0005] An object of the present disclosure is to provide a lighting device and an emergency lighting fixture that can suppress an increase in the time required to detect a power outage even if the normal power supply is interrupted during inspection or while the light is always off. [Means for solving the problem]

[0006] A lighting device according to one aspect of the present disclosure includes a normal lighting circuit, an emergency lighting circuit, a charging circuit, a power failure detection circuit, a dummy load circuit, and a control circuit. The normal lighting circuit lights a light source with normal power supplied from a normal power source, and the emergency lighting circuit lights the light source with emergency power supplied from an emergency power source. The charging circuit charges the emergency power source with the normal power. The power failure detection circuit detects a power failure in the normal power source when an intermediate voltage, which is a voltage generated by the normal power, falls below a threshold. The dummy load circuit is applied with the intermediate voltage and can switch between a conductive state in which a dummy current generated by the intermediate voltage flows, and a cut-off state in which the dummy current is cut off. The control circuit controls the dummy load circuit. When at least one of the charging circuit and the normal lighting circuit stops operating, the control circuit switches the dummy load circuit from the cut-off state to the conductive state.

[0007] An emergency lighting device according to one aspect of the present disclosure comprises the above-described lighting device, the light source that is turned on by the lighting device, the emergency power supply, and a housing that houses the lighting device, the light source, and the emergency power supply. [Effects of the Invention]

[0008] As described above, the present disclosure has the effect of suppressing an increase in the time required to detect a power outage even if the utility power source is interrupted during inspection or while the lights are constantly off. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a block diagram illustrating a lighting device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing the appearance of an emergency lighting fixture equipped with the lighting device. [Figure 3] FIG. 3 is an exploded perspective view of the emergency lighting device. [Figure 4] FIG. 4 is a circuit diagram showing a dummy load circuit of the lighting device. [Figure 5]FIG. 5 is a waveform diagram showing the operation of the lighting device. [Figure 6] FIG. 6 is a block diagram showing a lighting device of a comparative example. [Figure 7] FIG. 7 is a waveform diagram showing the operation of the lighting device of the comparative example. [Figure 8] FIG. 8 is a waveform diagram showing another operation of the lighting device of the comparative example. [Figure 9] FIG. 9 is a block diagram showing a lighting device according to a first modified example of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0010] A lighting device 1 and an emergency lighting device A1 according to an embodiment of the present disclosure will be described in detail with reference to the drawings. However, each diagram described in the following embodiment is a schematic diagram, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiment are merely examples of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0011] (1) Overview As shown in FIG. 1, a lighting device 1 according to the embodiment includes a normal lighting circuit 10, an emergency lighting circuit 11, a charging circuit 12, a power failure detection circuit 13, a dummy load circuit 16, and a control circuit 14. The normal lighting circuit 10 lights an LED (Light Emitting Diode) 2 (light source) using normal power supplied from a commercial AC power source P1 (normal power source). The emergency lighting circuit 11 lights the LED 2 using emergency power supplied from a battery unit B1 (emergency power source). The charging circuit 12 charges the battery unit B1 with the normal power. The power failure detection circuit 13 detects a power failure in the commercial AC power source P1 when an intermediate voltage Vi, which is a voltage generated by the normal power, falls below a threshold Vt (see FIG. 5). The dummy load circuit 16 is applied with the intermediate voltage Vi and can switch between a conductive state in which a dummy current Id generated by the intermediate voltage Vi flows and a cut-off state in which the dummy current Id is cut off. The control circuit 14 controls the dummy load circuit 16. When at least one of the charging circuit 12 and the normal lighting circuit 10 stops operating, the control circuit 14 switches the dummy load circuit 16 from a cut-off state to a conductive state.

[0012] In the lighting device 1 described above, when at least one of the charging circuit 12 and the normal lighting circuit 10 is stopped during inspection, a dummy current Id generated by the intermediate voltage Vi flows through the dummy load circuit 16. Therefore, even if the commercial AC power supply P1 is interrupted during inspection or while the lighting device 1 is normally off, the lighting device 1 can suppress an increase in the time required to detect a power outage.

[0013] (2) Details of the emergency lighting device according to the embodiment An emergency lighting device A1 (hereinafter simply referred to as emergency lighting device A1) according to an embodiment will be described in detail with reference to the drawings. The emergency lighting device A1 described below is an emergency exit guide light installed at an emergency exit or a passageway leading to an emergency exit in a building such as an office or store. However, the emergency lighting device according to the embodiment is not limited to an emergency exit guide light, and may be, for example, a stairway guide light installed in a stairwell in a building, or an emergency light installed on a ceiling or the like in a room. In the following description, unless otherwise specified, the up-down, front-back, and left-right directions indicated by arrows in FIG. 2 are defined as the up-down, front-back, and left-right directions of the emergency lighting device A1.

[0014] The emergency lighting device A1 includes a lighting device 1 according to the embodiment (hereinafter simply referred to as lighting device 1), a body A10, a light source unit A11, a display block A12, a battery unit B1, and the like (see FIGS. 2 and 3).

[0015] The housing A10 is made of synthetic resin and has a rectangular box shape with an opening on the front (see Figure 3). The housing A10 houses the lighting device 1, the battery unit B1, the terminal block 90, the mounting plate 91, etc.

[0016] The mounting plate 91 is formed into a plate shape from a metal material (see FIG. 3). The mounting plate 91 is screwed to the inner bottom surface of the housing A10. The lighting device 1 and terminal block 90 are screwed to the mounting plate 91 and housed inside the housing A10. The lighting device 1 and terminal block 90 are electrically connected. The terminal block 90 is electrically connected to a power line that is drawn in from a power supply hole 96 (see FIG. 3) provided on the bottom surface of the housing A10. In other words, the lighting device 1 is electrically connected to the commercial AC power source P1 through the terminal block 90 and the power line.

[0017] The battery unit B1 is detachably attached to the mounting plate 91. The battery unit B1 is electrically connected to the lighting device 1 when attached to the mounting plate 91.

[0018] The display block A12 has a display panel 92, a light guide plate 93, and a holder 94 (see FIG. 3).

[0019] The display panel 92 is formed in the shape of a rectangular flat plate from a translucent synthetic resin material such as acrylic resin or polycarbonate resin. However, the display panel 92 may be formed from a translucent material other than synthetic resin, such as quartz glass. A pictogram 921 for evacuation guidance is displayed on the front surface (display surface 920) of the display panel 92 (see FIG. 2).

[0020] The light guide plate 93 is formed in the shape of a rectangular flat plate from a translucent synthetic resin material such as acrylic resin or polycarbonate resin. The light guide plate 93 is disposed behind the display panel 92 so that its front surface faces the rear surface of the display panel 92 (see FIG. 3). Light emitted from the light source unit A11 is incident on the upper surface (incident surface 930) of the light guide plate 93. The light incident on the incident surface 930 is guided inside the light guide plate 93 and emitted from the front surface of the light guide plate 93. The display panel 92 is illuminated by the light emitted from the exit surface of the light guide plate 93.

[0021] The holder 94 is made of a non-transparent synthetic resin material and has a rectangular box (frame) shape with an open front and top. The holder 94 holds the display panel 92 and the light guide plate 93 such that the display panel 92 is positioned in front of the light guide plate 93 (see FIG. 3).

[0022] The display block A12 is attached to the body A10 so as to cover the remaining part of the opening of the body A10 except for the upper part where the light source unit A11 is attached (see FIG. 2).

[0023] The light source unit A11 has an LED 2 (see FIG. 1) that serves as a light source, a light guide that guides the light emitted from the LED 2, and a housing 95 that houses the LED 2 and the light guide (see FIG. 3).

[0024] The housing 95 is formed in the shape of a long box with its bottom and rear open. The LED 2 is mounted on a board and housed in one longitudinal end (right end) of the housing 95. The light guide is formed in the shape of a long rectangular pillar and housed in the housing 95 with its one longitudinal end face (right end face) facing the LED 2 and its side face along the longitudinal direction (bottom face) facing the opening in the bottom face of the housing 95. A part of the board on which the LED 2 is mounted (hereinafter referred to as a protruding piece 97) protrudes from the rear face of the housing 95 (see FIG. 3).

[0025] The light source unit A11 is attached to the housing A10 by fitting it into the upper front part of the housing A10. At this time, a protruding piece 97 is inserted into a connector 98 provided in the upper right corner of the housing A10, and the light source unit A11 (LED 2) and the lighting device 1 are electrically connected via the connector 98 and an electric wire (not shown).

[0026] Thus, when the light source unit A11 is attached to the housing A10, the incident surface 930 of the light guide plate 93 and the exit port of the light source unit A11 face each other in the vertical direction. Therefore, almost all of the light emitted from the exit port of the light source unit A11 enters the light guide plate 93 from the incident surface 930 of the light guide plate 93. The light that has entered the light guide plate 93 travels inside the light guide plate 93 and is totally reflected by the rear surface of the holder 94, and is emitted forward from the exit surface of the light guide plate 93 to illuminate the display panel 92.

[0027] (3) Details of the lighting device according to the embodiment Next, the lighting device 1 will be described in detail with reference to the block diagram of FIG.

[0028] The lighting device 1 includes a normal lighting circuit 10, an emergency lighting circuit 11, a charging circuit 12, a power failure detection circuit 13, a control circuit 14, a control power supply circuit 15, and a dummy load circuit 16. The lighting device 1 also includes a rectifier circuit 40, an input capacitor 41, diodes D1-D4, and an inspection switch SW1.

[0029] The lighting device 1 uses the commercial AC power supply P1 as a normal power supply and the battery unit B1 as an emergency power supply, and uses the normal power supplied from the commercial AC power supply P1 and the emergency power supplied from the battery unit B1 to light up the LED 2. The lighting device 1 also charges the battery unit B1 using the normal power supplied from the commercial AC power supply P1.

[0030] (3.1) Rectifier circuit, input capacitor The rectifier circuit 40 is a diode bridge. The rectifier circuit 40 full-wave rectifies the AC voltage Vac (for example, a sinusoidal voltage with a frequency of 50 Hz or 60 Hz and an effective value of 100 V or 200 V) input from the commercial AC power supply P1. The pulsating voltage output from the rectifier circuit 40 is smoothed by an input capacitor 41 made of an electrolytic capacitor. The DC voltage smoothed by the input capacitor 41 is then input to the normal lighting circuit 10.

[0031] (3.2) Regular lighting circuit The normal lighting circuit 10 uses normal power supplied from a commercial AC power supply P1 to light the LED 2. In this embodiment, the normal power is supplied from the commercial AC power supply P1 to the normal lighting circuit 10 via a rectifier circuit 40 and an input capacitor 41.

[0032] The normal lighting circuit 10 has a so-called isolated flyback converter including a transformer T1, a switching element Q1, a diode D1, a smoothing capacitor C1, and a converter control unit 10a. The normal lighting circuit 10 further has an output adjustment circuit 10b.

[0033] A first end of a primary winding N1 of the transformer T1 is electrically connected to a high-potential side terminal of the input capacitor 41, and a second end of the primary winding N1 is electrically connected to a drain terminal of a switching element Q1. The switching element Q1 is an N-channel field-effect transistor. A source terminal of the switching element Q1 is electrically connected to a low-potential side terminal of the input capacitor 41. A gate terminal of the switching element Q1 is electrically connected to the converter control unit 10a.

[0034] A first end of a secondary winding N2 of the transformer T1 is electrically connected to the anode of the diode D1, and a second end of the secondary winding N2 is electrically connected to a low-potential terminal of the smoothing capacitor C1. A high-potential terminal of the smoothing capacitor C1 is electrically connected to a cathode of the diode D1. A high-potential terminal of the smoothing capacitor C1 is electrically connected to an anode of the LED2 via the output adjustment circuit 10b. A low-potential terminal of the smoothing capacitor C1 is electrically connected to a cathode of the LED2.

[0035] The converter control unit 10a is configured as an integrated circuit. The converter control unit 10a performs PWM (pulse width modulation) control on the switching element Q1 so that the lighting current Io, which is the current flowing through the LED 2, matches a first target value. The converter control unit 10a lights up the LED 2 by matching the lighting current Io to the first target value. Furthermore, the converter control unit 10a controls the output adjustment circuit 10b. The converter control unit 10a and the switching element Q1 may be configured as a single integrated circuit.

[0036] In this embodiment, the output adjustment circuit 10b detects the magnitude of the lighting current Io and outputs a feedback signal Y1 including the detection result of the lighting current Io to the converter control unit 10a. By receiving the feedback signal Y1, the converter control unit 10a can monitor the magnitude of the lighting current Io and feedback-control the lighting current Io. Note that the lighting device 1 may also include a current detection circuit that detects the lighting current Io, separate from the output adjustment circuit 10b. It is preferable that the current detection circuit be configured to include a resistor connected in series with the LED 2 and through which the lighting current Io flows. It is also preferable that the converter control unit 10a receive the feedback signal Y1 via a photocoupler.

[0037] The normal lighting circuit 10 receives the voltage across the input capacitor 41 and PWM controls the switching element Q1 as described above to generate a DC intermediate voltage Vi in the smoothing capacitor C1. In other words, the intermediate voltage Vi is a voltage generated by normal power.

[0038] The output adjustment circuit 10b includes a switch element controlled by the converter control unit 10a. The switch element of the output adjustment circuit 10b is electrically connected between the high-potential terminal of the smoothing capacitor C1 and the anode of the LED 2. That is, the switch element of the output adjustment circuit 10b is inserted in the power supply path electrically connecting the smoothing capacitor C1 and the LED 2, and the output adjustment circuit 10b can selectively switch the power supply path between a conductive state and a cut-off state. Therefore, when the switch element of the output adjustment circuit 10b is turned on, the intermediate voltage Vi of the smoothing capacitor C1 supplies the lighting current Io to the LED 2, lighting the LED 2. On the other hand, when the switch element of the output adjustment circuit 10b is turned off, the lighting current Io supplied from the smoothing capacitor C1 to the LED 2 is cut off, turning the LED 2 off. The switch element is preferably a transistor, such as a field-effect transistor or a bipolar transistor.

[0039] Moreover, the output adjustment circuit 10b detects the magnitude of the lighting current Io, and outputs a feedback signal Y1 including the detection result of the lighting current Io to the converter control unit 10a.

[0040] (3.3)Charging circuit The charging circuit 12 charges the battery unit B1 with normal power.

[0041] Specifically, charging circuit 12 is a switching power supply that receives the intermediate voltage Vi of smoothing capacitor C1 as input and supplies charging current Ic to battery unit B1. The charging current Ic is supplied to battery unit B1 via diode D2 for preventing backflow. Charging circuit 12 charges battery unit B1 by controlling charging current Ic while monitoring battery voltage Vb, which is the voltage of battery unit B1.

[0042] If the charging circuit 12 does not receive the charging stop signal Y4 from the control circuit 14 (if the charging stop signal Y4 is at L level), it performs charging and supplies the charging current Ic to the battery unit B1 using the intermediate voltage Vi. If the charging circuit 12 receives the charging stop signal Y4 from the control circuit 14 (if the charging stop signal Y4 is at H level), it stops charging and does not supply the charging current Ic to the battery unit B1.

[0043] (3.4) Power outage detection circuit The power outage detection circuit 13 detects a power outage of the commercial AC power supply P1 when the intermediate voltage Vi, which is a voltage generated by normal power, becomes lower than a threshold value Vt (see FIG. 5).

[0044] Specifically, the power outage detection circuit 13 is composed of a Zener diode, a resistor, and the like. If the intermediate voltage Vi is equal to or greater than the threshold value Vt, the power outage detection circuit 13 determines that the commercial AC power supply P1 is energized and that there is no power outage. If the intermediate voltage Vi is less than the threshold value Vt, the power outage detection circuit 13 determines that there is a power outage in the commercial AC power supply P1. The power outage detection circuit 13 generates a power outage detection signal Y2 based on the power outage determination result and outputs the power outage detection signal Y2 to the control circuit 14. The control circuit 14 can determine whether there is a power outage in the commercial AC power supply P1 based on the power outage detection signal Y2.

[0045] (3.5) Emergency lighting circuit The emergency lighting circuit 11 uses emergency power supplied from the battery unit B1 to light the LED 2. In this embodiment, the emergency power is supplied to the emergency lighting circuit 11 from the battery unit B1.

[0046] Specifically, the emergency lighting circuit 11 has a flyback converter equipped with a transformer and a switching element, and outputs the battery voltage Vb of the battery unit B1 by stepping up or stepping down. The high-potential output terminal of the emergency lighting circuit 11 is electrically connected to the anode of LED2, and the low-potential output terminal of the emergency lighting circuit 11 is electrically connected to the cathode of LED2. The emergency lighting circuit 11 controls the output so that the lighting current Io, which is the current flowing through LED2, matches a second target value. The emergency lighting circuit 11 lights up LED2 by matching the lighting current Io to the second target value. However, the second target value of the emergency lighting circuit 11 is smaller than the first target value of the normal lighting circuit 10.

[0047] Furthermore, when the emergency lighting circuit 11 is operating (boosting or lowering the battery voltage Vb), the emergency lighting circuit 11 uses emergency power to generate an auxiliary voltage Vg to supply power to the control power supply circuit 15. A diode D4 for preventing backflow is electrically connected between the emergency lighting circuit 11 and the control power supply circuit 15, and the auxiliary voltage Vg is input to the control power supply circuit 15 via the diode D4.

[0048] The emergency lighting circuit 11 may include a forward converter instead of a flyback converter.

[0049] (3.6) Control power supply circuit The control power supply circuit 15 generates a control voltage Vc for operating the control circuit 14 .

[0050] Specifically, the control power supply circuit 15 has a step-down series regulator. A backflow prevention diode D3 is electrically connected between the high-potential terminal of the smoothing capacitor C1 and the high-potential input terminal of the control power supply circuit 15, and the intermediate voltage Vi is input to the control power supply circuit 15 via the diode D3. A backflow prevention diode D4 is electrically connected between the emergency lighting circuit 11 and the control power supply circuit 15, and the auxiliary voltage Vg generated by the emergency lighting circuit 11 is input to the control power supply circuit 15 via the diode D4. That is, an OR circuit formed by the diodes D3 and D4 inputs the higher of the intermediate voltage Vi and the auxiliary voltage Vg as the control input voltage Vr to the control power supply circuit 15. The control power supply circuit 15 uses the intermediate voltage Vi or the auxiliary voltage Vg as the control input voltage Vr, generates a control voltage Vc from the control input voltage Vr, and outputs the control voltage Vc to the control circuit 14.

[0051] (3.7) Dummy load circuit The dummy load circuit 16 is electrically connected across the smoothing capacitor C1, and is capable of switching between a conductive state in which an intermediate voltage Vi is applied and a dummy current Id generated by the intermediate voltage Vi flows, and a cut-off state in which the dummy current Id is cut off.

[0052] FIG. 4 shows an example of the configuration of dummy load circuit 16. Dummy load circuit 16 shown in FIG. 4 includes a series circuit of resistor R10 and switch element Q10. Although switch element Q10 in FIG. 4 is an N-channel field-effect transistor, switch element Q10 may also be a bipolar transistor. A first terminal of resistor R10 is electrically connected to the high-potential terminal of smoothing capacitor C1, and a second terminal of resistor R10 is electrically connected to the drain terminal of switch element Q10. A source terminal of switch element Q10 is electrically connected to the low-potential terminal of smoothing capacitor C1. In other words, an intermediate voltage Vi is applied across the series circuit of resistor R10 and switch element Q10.

[0053] The gate terminal of the switch element Q10 is electrically connected to the control circuit 14, and the switch element Q10 is switched on and off by a discharge signal Ya output by the control circuit 14. When the control circuit 14 turns on the switch element Q10, the dummy load circuit 16 is in a conductive state. When the control circuit 14 turns off the switch element Q10, the dummy load circuit 16 is in a cut-off state. Specifically, the switch element Q10 is on when the discharge signal Ya is at a high level, and is off when the discharge signal Ya is at a low level. When the switch element Q10 is in an on state, a dummy current Id due to an intermediate voltage Vi flows through the series circuit of the resistor element R10 and the switch element Q10. When the switch element Q10 is in an off state, the dummy current Id is cut off.

[0054] (3.8) Inspection switch The inspection switch SW1 has an operating unit that can be operated by a person, and a person operates the inspection switch SW1 when inspecting the emergency lighting fixture A1 or the lighting device 1. When the operating unit is operated, the inspection switch SW1 outputs an inspection signal Ys to the control circuit 14. The inspection switch SW1 has an operating unit that is, for example, a push button switch, a toggle switch, a seesaw switch, or a touch panel.

[0055] (3.9) Control circuit The control circuit 14 includes a microcontroller and is operated by receiving a control voltage Vc from a control power supply circuit 15.

[0056] The control circuit 14 receives a power outage detection signal Y2 from the power outage detection circuit 13. The control circuit 14 can determine whether or not the commercial AC power supply P1 is experiencing a power outage based on the power outage detection signal Y2. If the commercial AC power supply P1 is not experiencing a power outage, the control circuit 14 operates in a normal operation mode (normal mode). If the commercial AC power supply P1 is experiencing a power outage, the control circuit 14 operates in an emergency operation mode (emergency mode). If the control circuit 14 receives an inspection signal Ys, the control circuit 14 operates in an inspection operation mode (inspection mode).

[0057] That is, the control circuit 14 controls the normal lighting circuit 10, the emergency lighting circuit 11, and the charging circuit 12. When the power outage detection circuit 13 detects a power outage, the control circuit 14 stops the charging circuit 12 and activates the emergency lighting circuit 11. Furthermore, when the control circuit 14 receives the inspection signal Ys, it stops the normal lighting circuit 10 and the charging circuit 12 and activates the emergency lighting circuit 11.

[0058] (3.9.1) Normal mode In the normal mode, the control circuit 14 can switch between always lighting up and always turning off the LED 2.

[0059] When LED2 is constantly lit, the control circuit 14 instructs the converter control unit 10a to switch the output adjustment circuit 10b to a conductive state (to turn on the switch element of the output adjustment circuit 10b) and operate the normal lighting circuit 10, thereby constantly lighting LED2. That is, when LED2 is constantly lit, normal power is stored in the smoothing capacitor C1, and a lighting current Io is supplied to LED2 by the intermediate voltage Vi.

[0060] When the LED2 is constantly turned off, the control circuit 14 instructs the converter control unit 10a to switch the output adjustment circuit 10b to a cutoff state (the switch element of the output adjustment circuit 10b is turned off) and stop the normal lighting circuit 10, thereby constantly turning off the LED2. That is, when the LED2 is constantly turned off, normal power is stored in the smoothing capacitor C1, but the lighting current Io is not supplied to the LED2.

[0061] Note that "the normal lighting circuit 10 operates" means that the output adjustment circuit 10b is in a conductive state and the lighting current Io is supplied at the intermediate voltage Vi (normal power). "The normal lighting circuit 10 stops" means that the output adjustment circuit 10b is in a cutoff state and the lighting current Io is not supplied at the intermediate voltage Vi (normal power).

[0062] In the normal mode, the control circuit 14 does not output the emergency lighting signal Y3 to the emergency lighting circuit 11 (keeps the emergency lighting signal Y3 at L level), and keeps the emergency lighting circuit 11 in a stopped state.

[0063] In the normal mode, the control circuit 14 does not output the charging stop signal Y4 (keeps the charging stop signal Y4 at the L level) and operates the charging circuit 12.

[0064] In the normal mode, the normal lighting circuit 10 keeps the LED 2 constantly lit or constantly extinguished, and the charging circuit 12 charges the battery unit B1.

[0065] Furthermore, in the normal use mode, the control circuit 14 does not output the discharge signal Ya to the dummy load circuit 16 when the lamp is always on (maintains the discharge signal Ya at L level), and maintains the dummy load circuit 16 in a cut-off state. Also, in the normal use mode, the control circuit 14 outputs the discharge signal Ya to the dummy load circuit 16 when the lamp is always off (maintains the discharge signal Ya at H level), and maintains the dummy load circuit 16 in a conductive state.

[0066] In the normal mode, the flyback converter of the normal lighting circuit 10 operates to generate the intermediate voltage Vi, so the control power supply circuit 15 generates the control voltage Vc using the intermediate voltage Vi as the control input voltage Vr, and the control circuit 14 becomes operable.

[0067] (3.9.2) Emergency Mode In the emergency mode, the control circuit 14 instructs the converter control unit 10a to switch the output adjustment circuit 10b to a cutoff state (the switch element of the output adjustment circuit 10b is turned off) and stop the normal lighting circuit 10. Note that "the normal lighting circuit 10 stops" means that the output adjustment circuit 10b is in a cutoff state and the lighting current Io is not supplied by the intermediate voltage Vi (normal power).

[0068] Furthermore, in the emergency mode, the control circuit 14 outputs the emergency lighting signal Y3 to the emergency lighting circuit 11 (maintaining the emergency lighting signal Y3 at H level). The emergency lighting circuit 11 operates when the emergency lighting signal Y3 is at H level. When the emergency lighting circuit 11 operates, emergency power from the battery unit B1 is supplied to the LED2 through the emergency lighting circuit 11, causing the LED2 to light up. Thus, the emergency lighting circuit 11 lights up the LED2 (emergency lighting).

[0069] When the emergency lighting circuit 11 operates, emergency power from the battery unit B1 is supplied to the control power supply circuit 15 through the emergency lighting circuit 11, the control power supply circuit 15 generates the control voltage Vc from the auxiliary voltage Vg, and the control circuit 14 becomes operable. That is, when the power outage detection circuit 13 detects a power outage, the control power supply circuit 15 generates the control voltage Vc from the emergency power.

[0070] Furthermore, in the emergency mode, the control circuit 14 does not output the discharge signal Ya to the dummy load circuit 16 (maintains the discharge signal Ya at the L level), and maintains the dummy load circuit 16 in an interrupted state.

[0071] Furthermore, when the commercial AC power supply P1 experiences a power outage, the supply of charge to the smoothing capacitor C1 by normal power stops, so the intermediate voltage Vi gradually decreases. When the intermediate voltage Vi falls below the lower limit (lower operating limit) of the operating voltage of the charging circuit 12, the charging circuit 12 stops operating, and the charging current Ic to the battery unit B1 stops flowing.

[0072] (3.9.3) Inspection mode The inspection is performed while the commercial AC power supply P1 is energized. In the inspection mode, the control circuit 14 instructs the converter control unit 10a to switch the output adjustment circuit 10b to a cutoff state (to turn off the switch element of the output adjustment circuit 10b), and stops the normal lighting circuit 10.

[0073] Furthermore, in the inspection mode, the control circuit 14 outputs the emergency lighting signal Y3 to the emergency lighting circuit 11 (maintaining the emergency lighting signal Y3 at H level). The emergency lighting circuit 11 operates when the emergency lighting signal Y3 is at H level. When the emergency lighting circuit 11 operates, emergency power from the battery unit B1 is supplied to the LED2 through the emergency lighting circuit 11, and the LED2 lights up. Thus, the emergency lighting circuit 11 lights up the LED2 (inspection lighting).

[0074] In the inspection mode, the control power supply circuit 15 sets the higher voltage between the intermediate voltage Vi and the auxiliary voltage Vg as the control input voltage Vr, and outputs the control voltage Vc generated from the control input voltage Vr to the control circuit 14. In this embodiment, the intermediate voltage Vi is higher than the auxiliary voltage Vg. Therefore, in the inspection mode, the control power supply circuit 15 generates the control voltage Vc from the intermediate voltage Vi, and the control circuit 14 becomes operable. That is, in the inspection mode, the control power supply circuit 15 generates the control voltage Vc from the normal power.

[0075] Furthermore, in the inspection mode, the control circuit 14 outputs the discharge signal Ya to the dummy load circuit 16 (maintains the discharge signal Ya at H level), and maintains the dummy load circuit 16 in a conductive state.

[0076] Furthermore, in the inspection mode, the control circuit 14 outputs the charge stop signal Y4 (maintaining the charge stop signal Y4 at H level) to stop the charging of the battery unit B1 by the charging circuit 12.

[0077] That is, when the lighting device 1 receives the inspection signal Ys, it stops the charging operation of the charging circuit 12 and uses the emergency power of the battery unit B1 to light up the LED 2. Note that inspections include periodic inspections carried out at legally specified intervals and user inspections carried out by the user.

[0078] (3.10) Operation when commercial AC power is interrupted during inspection The operation when the commercial AC power supply P1 is interrupted during inspection will be described in detail below.

[0079] (3.10.1) Comparative example Fig. 6 shows a block diagram of a lighting device 100 of a comparative example. The lighting device 100 differs from the lighting device 1 in that it does not include a dummy load circuit 16. Note that, in the lighting device 100, components similar to those of the lighting device 1 of the present embodiment shown in Fig. 1 are designated by the same reference numerals, and descriptions thereof will be omitted.

[0080] 7 shows voltage waveforms, current waveforms, and signal waveforms of various parts of lighting device 100 before and after a power outage occurs in commercial AC power supply P1 when control circuit 14 is operating in the inspection mode. From the top to bottom, Fig. 7 shows the waveforms of AC voltage Vac, intermediate voltage Vi, power outage detection signal Y2, inspection signal Ys, charging stop signal Y4, emergency lighting signal Y3, charging current Ic, emergency voltage Ve, and auxiliary voltage Vg.

[0081] First, the commercial AC power supply P1 is in a conducting state, the intermediate voltage Vi has a voltage value V10 (>0), and the control circuit 14 operates in the normal mode.

[0082] Then, at time t11, when the inspection switch SW1 is operated and an inspection signal Ys is generated, the control circuit 14 starts operating in inspection mode. When the control circuit 14 starts operating in inspection mode, it transitions the emergency lighting signal Y3 from L level to H level and the charging stop signal Y4 from L level to H level. When the charging circuit 12 receives the H-level charging stop signal Y4, it stops operating, and the charging current Ic drops to zero. The emergency lighting circuit 11 starts operating a delay time Td after receiving the H-level emergency lighting signal Y3. When the emergency lighting circuit 11 starts operating, the emergency voltage Ve and the auxiliary voltage Vg gradually increase and reach steady-state values ​​Ve1 and Vg1, respectively. In inspection mode, the emergency voltage Ve lights the LED 2 (inspection lighting), and the control power supply circuit 15 generates the control voltage Vc from the intermediate voltage Vi.

[0083] When the control circuit 14 is operating in inspection mode, if the commercial AC power supply P1 experiences a power outage at time t12, the supply of charge from the normal power to the smoothing capacitor C1 stops, and the intermediate voltage Vi gradually decreases from time t12 onward. When the intermediate voltage Vi drops from the voltage value V10 to the threshold value Vt at time t13, the power outage detection circuit 13 detects a power outage in the commercial AC power supply P1 and transitions the power outage detection signal Y2 from L level to H level. When the control circuit 14 receives the H-level power outage detection signal Y2, it begins operating in emergency mode. At this time, the detection time required from the occurrence of the power outage at time t12 until the power outage detection circuit 13 detects the power outage at time t13 is ts10.

[0084] 8 shows voltage waveforms, current waveforms, and signal waveforms of various parts of the lighting device 100 before and after a power outage occurs in the commercial AC power supply P1 when the control circuit 14 is operating in the normal mode. From the top to bottom, Fig. 8 shows the waveforms of the AC voltage Vac, intermediate voltage Vi, power outage detection signal Y2, emergency lighting signal Y3, charging current Ic, emergency voltage Ve, and auxiliary voltage Vg. The waveforms of various parts shown in Fig. 8 are the same as those of the lighting device 1 of this embodiment when a power outage occurs while the control circuit 14 is operating in the normal mode.

[0085] First, the commercial AC power supply P1 is in a conducting state, the intermediate voltage Vi has a voltage value V10 (>0), and the control circuit 14 operates in the normal mode.

[0086] When the commercial AC power supply P1 experiences a power outage at time t21, the supply of charge from normal power to the smoothing capacitor C1 stops, and the intermediate voltage Vi gradually decreases from time t21 onwards. When the intermediate voltage Vi decreases from the voltage value V10 to the threshold value Vt at time t22, the power outage detection circuit 13 detects a power outage in the commercial AC power supply P1 and transitions the power outage detection signal Y2 from L level to H level. When the control circuit 14 receives the power outage detection signal Y2 at H level, it begins operating in emergency mode and transitions the emergency lighting signal Y3 from L level to H level.

[0087] Even when control circuit 14 is operating in emergency mode, charging circuit 12 continues to operate, and charging current Ic continues to flow until time t23, when intermediate voltage Vi becomes less than lower operating limit V20 of charging circuit 12. After time t23, charging circuit 12 stops operating, and intermediate voltage Vi is not used to generate charging current Ic. Therefore, if the slope at which intermediate voltage Vi decreases is defined as the voltage decrease slope, the voltage decrease slope after time t23 is smaller (gentler) than the voltage decrease slope before time t23.

[0088] As shown in Figure 8, when a power outage occurs while control circuit 14 is operating in the normal mode (time t21), charging circuit 12 continues operating until intermediate voltage Vi drops to lower operating limit value V20 of charging circuit 12 (time t23), and intermediate voltage Vi is used to generate charging current Ic. Therefore, the slope of the decrease in intermediate voltage Vi after a power outage occurs while control circuit 14 is operating in the inspection mode (see Figure 7) is smaller (more gradual) than the slope of the decrease in intermediate voltage Vi after a power outage occurs while control circuit 14 is operating in the normal mode (see Figure 8). As a result, if the detection time required from the occurrence of a power outage at time t21 to the detection of the power outage by power outage detection circuit 13 at time t22 in Figure 8 is denoted as ts20, detection time ts10 in Figure 7 is longer than detection time ts20.

[0089] That is, in lighting device 100, if the commercial AC power supply P1 experiences a power outage during inspection, the time required to detect the power outage will increase compared to when the commercial AC power supply P1 experiences a power outage outside of inspection. For example, if lighting device 100 is equipped with a display unit that notifies the user of information such as inspection or power outage, there is a possibility that the display unit may notify the user of incorrect information or cause the user to misunderstand, such as by malfunctioning.

[0090] (3.10.2) This embodiment Therefore, the lighting device 1 of this embodiment operates as follows.

[0091] Fig. 5 shows voltage waveforms, current waveforms, and signal waveforms of various parts of the lighting device 1 before and after a power outage occurs in the commercial AC power supply P1 when the control circuit 14 is operating in the inspection mode. From the top to bottom, Fig. 5 shows the waveforms of the AC voltage Vac, intermediate voltage Vi, power outage detection signal Y2, inspection signal Ys, charge stop signal Y4, discharge signal Ya, emergency lighting signal Y3, charge current Ic, dummy current Id, emergency voltage Ve, and auxiliary voltage Vg.

[0092] First, the commercial AC power supply P1 is in a conducting state, the intermediate voltage Vi has a voltage value V10 (>0), and the control circuit 14 operates in the normal mode.

[0093] Then, at time t1, when the inspection switch SW1 is operated and an inspection signal Ys is generated, the control circuit 14 starts operating in the inspection mode. When the control circuit 14 starts operating in the inspection mode, it transitions the emergency lighting signal Y3 from L level to H level and the charging stop signal Y4 from L level to H level. When the charging circuit 12 receives the H-level charging stop signal Y4, it stops operating, and the charging current Ic drops to zero. The emergency lighting circuit 11 starts operating a delay time Td after receiving the H-level emergency lighting signal Y3. When the emergency lighting circuit 11 starts operating, the emergency voltage Ve and the auxiliary voltage Vg gradually increase and reach steady-state values ​​Ve1 and Vg1, respectively. When the control circuit 14 starts operating in the inspection mode, it instructs the converter control unit 10a to switch the output adjustment circuit 10b to a cutoff state (turning the switch elements of the output adjustment circuit 10b to an off state) and stop the normal lighting circuit 10. That is, when the control circuit 14 operates in the inspection mode, the operations of the charging circuit 12 and the normal lighting circuit 10 are stopped.

[0094] Furthermore, in the lighting device 1 of this embodiment, when the control circuit 14 starts operation in the inspection mode, it transitions the discharge signal Ya from L level to H level (outputs the discharge signal Ya to the dummy load circuit 16). In the dummy load circuit 16, the H-level discharge signal Ya turns on the switch element Q10 (see FIG. 4), and the intermediate voltage Vi of the smoothing capacitor C1 causes a dummy current Id to flow through the series circuit (see FIG. 4) of the switch element Q10 and the resistor element R10.

[0095] When the control circuit 14 is operating in the inspection mode, if the commercial AC power supply P1 experiences a power outage at time t2, the supply of charge to the smoothing capacitor C1 by the normal power stops, and the intermediate voltage Vi gradually decreases from time t2 onward. Even after time t2, the discharge signal Ya remains at the H level, and the dummy load circuit 16 remains conductive. Because the dummy load circuit 16 is conductive, the smoothing capacitor C1 discharges through the dummy load circuit 16, and the rate at which the intermediate voltage Vi decreases is faster than when the dummy load circuit 16 is turned off (corresponding to the comparative example). The resistance value of the resistive element R10 is preset so that the slope of the voltage decrease of the intermediate voltage Vi from time t2 to time t3 is approximately the same as or greater than the slope of the voltage decrease of the intermediate voltage Vi after the power outage occurs at time t21 shown in FIG. 8.

[0096] Then, when the intermediate voltage Vi drops from the voltage value V10 to the threshold value Vt at time t3, the power outage detection circuit 13 detects a power outage in the commercial AC power supply P1 and changes the power outage detection signal Y2 from L level to H level. When the control circuit 14 receives the H level power outage detection signal Y2, it starts operating in emergency mode. At this time, the detection time required for the power outage detection circuit 13 to detect the power outage after the power outage occurs is ts1.

[0097] When the control circuit 14 starts operation in the emergency mode, it transitions the discharge signal Ya from H level to L level (stops output of the discharge signal Ya) and switches the dummy load circuit 16 from the conductive state to the cut-off state. Note that the voltage drop slope of the intermediate voltage Vi after time t3 becomes smaller (more gradual) than the voltage drop slope of the intermediate voltage Vi after time t2 up to time t3.

[0098] In the lighting device 1 of this embodiment, when the control circuit 14 is operating in the inspection mode, the operation of the charging circuit 12 and the normal lighting circuit 10 is stopped. However, when the operation of the charging circuit 12 and the normal lighting circuit 10 is stopped during inspection, the dummy load circuit 16 is conductive, and a dummy current Id due to the intermediate voltage Vi flows through the dummy load circuit 16. As a result, even if a power outage occurs during inspection, the detection time ts1 required for the intermediate voltage Vi to drop to the threshold value Vt after the power outage occurs is approximately the same as or shorter than the detection time ts20 in FIG. 8. Therefore, even if the commercial AC power supply P1 experiences a power outage during inspection, the lighting device 1 can prevent an increase in the time required to detect a power outage.

[0099] Furthermore, when the control circuit 14 operates in the normal mode and keeps the LED 2 constantly off, the charging circuit 12 is operating, but the normal lighting circuit 10 is stopped. Even when the LED 2 is constantly off, the control circuit 14 outputs the discharge signal Ya to the dummy load circuit 16 (maintaining the discharge signal Ya at an H level) to maintain the dummy load circuit 16 in a conductive state. Therefore, when the LED 2 is constantly off, the dummy load circuit 16 is conductive, and a dummy current Id due to the intermediate voltage Vi flows through the dummy load circuit 16. As a result, even if a power outage occurs during the constantly off mode, the detection time required for the intermediate voltage Vi to drop to the threshold Vt after the power outage is approximately the same as or shorter than the detection time ts20 in FIG. 8 . Therefore, even if the commercial AC power supply P1 experiences a power outage during the constantly off mode, the lighting device 1 can minimize an increase in the time required for power outage detection.

[0100] (4) First Modification FIG. 9 shows a block configuration of a lighting device 1A of the first modified example.

[0101] In the lighting device 1A, the control circuit 14 uses the emergency lighting signal Y3 as the discharge signal Ya (see FIG. 1) of the lighting device 1. That is, the dummy load circuit 16 becomes conductive when it receives the emergency lighting signal Y3 at H level.

[0102] In the first modified example, when the control circuit 14 receives the inspection signal Ys, it operates in the inspection mode. The control circuit 14 operating in the inspection mode outputs the emergency lighting signal Y3 to the emergency lighting circuit 11 (maintains the emergency lighting signal Y3 at H level). When the emergency lighting circuit 11 receives the H-level emergency lighting signal Y3 (if the emergency lighting signal Y3 is at H level), it starts operating. Furthermore, the control circuit 14 instructs the converter control unit 10a to switch the output adjustment circuit 10b to a cut-off state and stop the normal lighting circuit 10.

[0103] Furthermore, in the first modified example, when the power outage detection circuit 13 detects a power outage, the control circuit 14 operates in emergency mode. The control circuit 14 operating in emergency mode outputs a charging stop signal Y4 to the charging circuit 12 (maintaining the charging stop signal Y4 at H level) and outputs an emergency lighting signal Y3 to the emergency lighting circuit 11 (maintaining the emergency lighting signal Y3 at H level). When the charging circuit 12 receives the charging stop signal Y4 (if the charging stop signal Y4 is H level), it stops operation of the charging circuit 12. When the emergency lighting circuit 11 receives an H-level emergency lighting signal Y3 (if the emergency lighting signal Y3 is H level), it starts operation of the emergency lighting circuit 11. Furthermore, the control circuit 14 instructs the converter control unit 10a to switch the output adjustment circuit 10b to a cutoff state and stop the normal lighting circuit 10.

[0104] Then, when the emergency lighting signal Y3 is generated (when the emergency lighting signal Y3 is at H level), the control circuit 14 switches the dummy load circuit 16 from a cut-off state to a conductive state. That is, in the first modified example, when the control circuit 14 operates in the inspection mode or the emergency mode, the dummy load circuit 16 is in a conductive state.

[0105] Therefore, also in the first modification, when the operations of the charging circuit 12 and the normal lighting circuit 10 are stopped, the dummy load circuit 16 is conductive, and a dummy current Id due to the intermediate voltage Vi flows through the dummy load circuit 16. As a result, even if the commercial AC power supply P1 experiences a power outage during inspection, the lighting device 1A can suppress an increase in the time required to detect the power outage.

[0106] (5) Second Modification In the above-described embodiment and the first modified example, the normal lighting circuit 10 and the emergency lighting circuit 11 light the same LED 2. However, the normal lighting circuit 10 and the emergency lighting circuit 11 may light different light sources. That is, the lighting device may include a normal LED that lights up when the commercial AC power supply P1 is energized, and an emergency LED that lights up when the commercial AC power supply P1 is powered down.

[0107] In the above-described embodiment and first modified example, when the operation of either the charging circuit 12 or the normal lighting circuit 10 is stopped, the dummy load circuit 16 may be conductive, and a dummy current Id due to the intermediate voltage Vi may flow through the dummy load circuit 16.

[0108] The emergency lighting device A1 is not limited to a disaster prevention lighting device. The emergency lighting device A1 may be any lighting device that receives emergency power from the battery unit B1 and turns on its light source. The emergency lighting device A1 may be, for example, a lighting device that emits illumination light to adjust the illuminance of a space.

[0109] The control circuit 14 preferably includes a computer system. The computer system is primarily composed of a processor and memory as hardware. At least a portion of the functions of the control circuit 14 in the present disclosure are realized by the processor executing a program stored in the memory of the computer system. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium readable by the computer system, such as a memory card, optical disk, or hard disk drive. The processor of the 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 circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), or ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmable after the LSI is manufactured, or logic devices capable of reconfiguring the connections within the LSI or the circuit partitions within the LSI, can also be used as processors. The electronic circuits may be integrated into one chip or distributed across multiple chips. The chips may be integrated into one device or distributed across multiple 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.

[0110] The light source is not limited to an LED, but may be another solid-state light emitting device such as an OLED (Organic Light Emitting Diode).

[0111] (6) Summary As described above, the lighting device (1, 1A) of the first aspect of the embodiment includes a normal lighting circuit (10), an emergency lighting circuit (11), a charging circuit (12), a power failure detection circuit (13), a dummy load circuit (16), and a control circuit (14). The normal lighting circuit (10) lights the light source (2) with normal power supplied from a normal power source (P1). The emergency lighting circuit (11) lights the light source (2) with emergency power supplied from an emergency power source (B1). The charging circuit (12) charges the emergency power source (B1) with the normal power. The power failure detection circuit (13) detects a power failure in the normal power source (P1) when the intermediate voltage (Vi), which is a voltage generated by the normal power, falls below the threshold (Vt). The dummy load circuit (16) is capable of switching between a conductive state in which an intermediate voltage (Vi) is applied and a dummy current (Id) generated by the intermediate voltage (Vi) flows, and a cut-off state in which the dummy current (Id) is cut off. A control circuit (14) controls the dummy load circuit (16). When at least one of the charging circuit (12) and the normal lighting circuit (10) stops operating, the control circuit (14) switches the dummy load circuit (16) from the cut-off state to the conductive state.

[0112] The lighting device (1, 1A) described above can suppress an increase in the time required to detect a power outage even if the utility power source (P1) is interrupted during inspection or while the lighting device is normally off.

[0113] Preferably, the lighting device (1, 1A) of the second aspect according to the embodiment is the first aspect, further comprising a capacitor (C1) to which the intermediate voltage (Vi) is applied.

[0114] The lighting device (1, 1A) described above can suppress an increase in the time required to detect a power outage even if the capacitance of the capacitor (C1) is large.

[0115] In the lighting device (1, 1A) of the third aspect of the embodiment, in the first or second aspect, the control circuit (14) preferably further controls the normal lighting circuit (10), the emergency lighting circuit (11), and the charging circuit (12). When the power failure detection circuit (13) detects a power failure, the control circuit (14) stops the charging circuit (12) and activates the emergency lighting circuit (11). When the control circuit (14) receives the inspection signal (Ys), it stops the normal lighting circuit (10) and the charging circuit (12) and activates the emergency lighting circuit (11).

[0116] The lighting device (1, 1A) described above can suppress an increase in the time required to detect a power outage even if the utility power source (P1) is interrupted during inspection.

[0117] In the lighting device (1A) of the fourth aspect of the embodiment, in the third aspect, when the power failure detection circuit (13) detects a power failure, the control circuit (14) preferably outputs a charging stop signal (Y4) to the charging circuit (12) and outputs an emergency lighting signal (Y3) to the emergency lighting circuit (11). When the charging circuit (12) receives the charging stop signal (Y4), it stops its operation. When the emergency lighting circuit (11) receives the emergency lighting signal (Y3), it performs its own operation. When the emergency lighting signal (Y3) is generated, the control circuit (14) switches the dummy load circuit (16) from a cut-off state to a conductive state.

[0118] The lighting device (1A) described above can simplify the configuration for controlling the dummy load circuit (16).

[0119] In the lighting device (1, 1A) according to a fifth aspect of the embodiment, in any one of the first to fourth aspects, the dummy load circuit (16) preferably includes a series circuit of a switch element (Q10) and a resistor element (R10). When the control circuit (14) turns on the switch element (Q10), the dummy load circuit (16) is brought into a conductive state. When the control circuit (14) turns off the switch element (Q10), the dummy load circuit (16) is brought into a cut-off state.

[0120] The lighting device (1, 1A) described above can easily realize the dummy load circuit (16).

[0121] An emergency lighting device (A1) of a sixth aspect of the embodiment includes a lighting device (1) of any one of the first to fifth aspects, a light source (2) that is turned on by the lighting device (1), an emergency power source (B1), and a housing (A10) that houses the lighting device (1), the light source (2), and the emergency power source (B1).

[0122] The above-described emergency lighting device (A1) can suppress an increase in the time required to detect a power outage even if the normal power source (P1) is powered off during inspection or while the device is normally turned off. [Explanation of symbols]

[0123] 1, 1A lighting device 10 Regular lighting circuit 11 Emergency lighting circuit 12 Charging circuit 13 Power outage detection circuit 14 Control circuit 16 Dummy load circuit Q10 Switch element R10 resistor element 2 LED (light source) A1 Emergency lighting equipment A10 body C1 Smoothing capacitor (capacitor) P1 Commercial AC power supply (normal power supply) B1 Battery unit (emergency power supply) Vi intermediate voltage Vt threshold Id dummy current Ys inspection signal Y3 Emergency signal Y4 Charging stop signal

Claims

1. a normal lighting circuit that lights the light source with normal power supplied from a normal power source; an emergency lighting circuit that lights the light source with emergency power supplied from an emergency power source; a charging circuit that charges the emergency power supply with the normal power; a power outage detection circuit that detects a power outage of the utility power supply when an intermediate voltage generated by the utility power falls below a threshold; a dummy load circuit that is applied with the intermediate voltage and can switch between a conductive state in which a dummy current generated by the intermediate voltage flows and a cut-off state in which the dummy current is cut off; a control circuit for controlling the dummy load circuit, When at least one of the charging circuit and the normal lighting circuit stops operating, the control circuit switches the dummy load circuit from the interrupted state to the conductive state. Lighting device.

2. a capacitor to which the intermediate voltage is applied; The lighting device according to claim 1.

3. The control circuit further controlling the normal lighting circuit, the emergency lighting circuit, and the charging circuit; When the power failure detection circuit detects the power failure, the power failure detection circuit stops the charging circuit and activates the emergency lighting circuit; When a check signal is received, the normal lighting circuit and the charging circuit are stopped, and the emergency lighting circuit is activated.

3. The lighting device according to claim 1 or 2.

4. When the power failure detection circuit detects the power failure, the control circuit outputs a charge stop signal to the charging circuit and an emergency lighting signal to the emergency lighting circuit; When the charging circuit receives the charging stop signal, the charging circuit stops operation of the charging circuit; When the emergency lighting circuit receives the emergency lighting signal, the emergency lighting circuit operates, The control circuit switches the dummy load circuit from the cut-off state to the conduction state when the emergency lighting signal is generated. The lighting device according to claim 3.

5. the dummy load circuit includes a series circuit of a switch element and a resistor element, When the control circuit turns on the switch element, the dummy load circuit is brought into the conductive state, When the control circuit turns off the switch element, the dummy load circuit is brought into the cutoff state.

3. The lighting device according to claim 1 or 2.

6. The lighting device according to claim 1 or 2; the light source that is turned on by the lighting device; The emergency power supply; a housing that houses the lighting device, the light source, and the emergency power supply; Equipped with Emergency lighting equipment.

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