Lighting fixture

Abstract

To provide a lighting fixture capable of achieving both operation and protection of a DC device by using an AC / DC power supply line that selectively supplies either AC power or DC power.SOLUTION: A lighting fixture 80B includes an input unit, a DC device 81a, an AC device 82a, an AC cutoff unit, and a DC cutoff unit. The input unit is connected to an AC / DC power supply line L1 that supplies electric power. The AC cutoff unit switches conduction and interruption of a DC connection circuit between a DC power supply line L2 and the AC / DC power supply line L1. The DC cutoff unit switches conduction and interruption of an AC connection circuit between an AC power supply line L3 and the AC / DC power supply line L1. The AC cutoff unit interrupts the DC connection circuit when the supplied power is AC power. The DC cutoff unit interrupts the AC connection circuit when the supplied power is DC power. The DC device 81a includes a first lighting circuit 811 and a first light source 812. The AC device 82a includes a second lighting circuit 821 and a second light source 822.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to lighting fixtures. [Background technology]

[0002] Patent Document 1 discloses a lighting system that utilizes an existing commercial power line by connecting a DC-driven LED lighting fixture to the existing commercial power line that constitutes a lighting power supply system. The lighting system includes an AC-DC converter and a DC-driven LED lighting fixture. The AC-DC converter is installed in the power receiving section of the existing commercial power line that constitutes the lighting power supply system, converts the commercial power received from the commercial power line into DC power, and supplies the converted DC power to the existing commercial power line. The DC-driven LED lighting fixture is connected to the existing commercial power line and lights up using the existing commercial power line as a DC power line.

[0003] Specifically, commercial power lines are laid in each guest room area of a hotel to construct a power system for lighting (hereinafter referred to as the lighting system) and a power system for outlets (hereinafter referred to as the outlet system). Multiple lighting fixtures are connected to the commercial power line for the lighting system. Multiple outlets are connected to the commercial power line for the outlet system. The commercial power line for the lighting system and the commercial power line for the outlet system are set up by branching the output power line into two systems via a joint on the secondary side of an overcurrent breaker installed in the power receiving section of the commercial power supply (100V AC) installed in each guest room area.

[0004] An AC-DC converter (AC-DC converter) that converts 100V AC power into DC power of a specified voltage (e.g., 24V) is installed at the power receiving section of the commercial power line for the lighting system on the secondary side (load side) of the overcurrent breaker, and the DC power converted by this AC-DC converter is supplied to the commercial power line for the lighting system. In other words, the commercial power line for the lighting system is directly diverted as a DC power line, and the DC power converted by the AC-DC converter is supplied to this DC power line. DC-driven LED lighting fixtures are connected to the commercial power line for the lighting system that receives the DC power and are illuminated by the DC power. In other words, DC-driven LED lighting fixtures are connected to the existing commercial power line and illuminate using the existing commercial power line as a DC power line. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-247097 Summary of the Invention [Problem to be solved by the invention]

[0006] In the lighting system described above, a DC-driven lighting fixture is connected to a DC power supply line (DC power supply path), and a plurality of outlets are connected to a commercial power supply line (AC power supply path).

[0007] However, in the above-mentioned lighting system, the DC power supply line and the AC power supply line are completely separated to prevent AC power from being supplied to DC devices, and one power supply line does not serve as both a DC power supply line and an AC power supply line. In other words, in the above-mentioned lighting system, it was not possible to operate DC devices using a power supply line that selectively sends either AC power or DC power (AC-DC power supply line).

[0008] Therefore, an object of the present disclosure is to provide a lighting fixture that can achieve both operation and protection of DC equipment by using an AC / DC power supply line that selectively transmits either AC power or DC power. [Means for solving the problem]

[0009] A lighting fixture according to one aspect of the present disclosure includes an input unit, a DC device, an AC device, an AC cutoff unit, and a DC cutoff unit. The input unit is connected to an AC / DC power supply path that transmits supply power from any of a plurality of external power sources including at least one AC power source and at least one DC power source. The AC cutoff unit switches between conduction and cutoff of a DC connection path between a DC power supply path that supplies the supply power to the DC device and the AC / DC power supply path. The DC cutoff unit switches between conduction and cutoff of an AC connection path between an AC power supply path that supplies the supply power to the AC device and the AC / DC power supply path. The AC cutoff unit conducts the DC connection path if the supply power is DC power, and cuts off the DC connection path if the supply power is AC power. The DC cutoff unit conducts the AC connection path if the supply power is AC power, and cuts off the AC connection path if the supply power is DC power. The DC device has a first lighting circuit and a first light source. The first lighting circuit converts the DC power into first load power. The first light source is lit by the first load power supplied from the first lighting circuit. The AC device has a second lighting circuit and a second light source. The second lighting circuit converts the AC power into second load power. The second light source is lit by the second load power supplied from the second lighting circuit. [Effects of the Invention]

[0010] As described above, the present disclosure has an advantage in that it is possible to achieve both operation and protection of DC devices by using an AC / DC power supply line that selectively transmits either AC power or DC power. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing a power supply system according to an embodiment. [Figure 2] FIG. 2 is a block diagram showing a DC protection device provided in the power supply system. [Figure 3] FIG. 3 is a circuit diagram showing the DC protection device of the same. [Figure 4] FIG. 4 is a block diagram showing an AC protection device provided in the power supply system of the above embodiment. [Figure 5] FIG. 5 is a circuit diagram showing the AC protection device of the same. [Figure 6] FIG. 6 is a block diagram showing the operation of the power supply system. [Figure 7] 7A and 7B are block diagrams showing emergency lighting fixtures and regular lighting fixtures in the power supply system of the same. [Figure 8] FIG. 8 is a block diagram showing a lighting fixture in the power supply system. [Figure 9] FIG. 9 is a block diagram showing a power supply system according to a first modification. [Figure 10] 10A and 10B are block diagrams showing a disaster prevention lighting fixture and a regular lighting fixture of the second modified example, respectively. [Figure 11] 11A and 11B are block diagrams showing a lighting fixture of a second modified example and a regular lighting fixture of a second modified example, respectively. [Figure 12] 12A and 12B are block diagrams showing a lighting fixture and a protection device of a third modified example, respectively. [Figure 13] FIG. 13 is a circuit diagram showing the protection device of the same. [Figure 14] FIG. 14 is a block diagram showing a part of a lighting fixture according to the fourth modification. [Figure 15] FIG. 15 is a block diagram showing a part of another lighting fixture of the fourth modified example. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following embodiments generally relate to a DC device protection device, a power supply system, and a lighting fixture. More specifically, they relate to a DC device protection device that protects DC devices, a power supply system, and a lighting fixture. Note that the following embodiments are merely examples of embodiments of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0013] The DC device protection device, power supply system, and lighting fixture according to the embodiments are mainly used in apartment buildings, detached houses, office buildings, commercial buildings, hotels, factories, stores, etc. However, the DC device protection device, power supply system, and lighting fixture according to the embodiments may also be used in facilities other than those described above.

[0014] (Embodiment) The following describes a protection device for DC equipment, a power supply system, and a lighting fixture used in an apartment building.

[0015] (1) Overview of the power supply system 1 shows the configuration of a power supply system 1 of this embodiment. The power supply system 1 includes a DC device protection device 2, AC / DC power supply lines L0 and L1, and a DC power supply line L2. The power supply system 1 preferably further includes an AC device protection device 3 and an AC power supply line L3. The power supply system 1 preferably further includes a switchboard 41, a distribution board 42, a branching device 43, and a DC power supply unit 44. In the following description, the DC device protection device 2 may be referred to as a DC protection device 2, and the AC device protection device 3 may be referred to as an AC protection device 3.

[0016] The switchboard 41 and the DC power supply unit 44 are installed outside each of the dwelling units H1, H2, ... in the building B1.

[0017] The distribution board 41 is electrically connected to a plurality of external power sources 9 (two external power sources 9 in FIG. 1 ), and distributes power (supply power) supplied from any one of the plurality of external power sources 9 to a plurality of distribution boards 42 in the building B1 via an AC / DC power supply line L0. The plurality of external power sources 9 include at least one AC power source and at least one DC power source. In the power supply system 1 of FIG. 1 , an AC power source 91 and a DC power source 92 of a DC power supply unit 44 are used as the two external power sources 9. The AC power source 91 is a commercial power system that supplies AC power with an effective voltage of 100 V. The DC power source 92 includes a rechargeable storage battery and supplies DC power with a voltage of 100 V.

[0018] The DC power supply unit 44 includes a DC power supply 92 and may further include an auxiliary power supply 44a.

[0019] The DC power supply 92 includes a storage battery 92a such as a lithium ion battery, a nickel-metal hydride battery, or a lead storage battery. The DC power supply 92 has a function of detecting a power outage of the AC power supply 91, and when the AC power supply 91 is energized, the storage battery 92a is charged using AC power supplied from the AC power supply 91. When the AC power supply 91 is powered out, the DC power supply 92 outputs the DC power of the storage battery 92a to the switchboard 41 as supply power.

[0020] The auxiliary power supply 44a converts the DC voltage of the storage battery 92a to a desired voltage to generate auxiliary power, which is then output from an outlet. The auxiliary power may be DC 5V, DC 1.5V, or AC 100V, and the outlet may be a Universal Serial Bus (USB) outlet, a DC outlet, or an AC outlet.

[0021] The distribution board 41 distributes AC power supplied from an AC power source 91 or DC power supplied from a DC power source 92 as supply power to multiple distribution boards 42 in building B1 via an AC / DC power feed line L0. When the AC power source 91 is energized, AC power is supplied from the AC power source 91 and DC power is not supplied from the DC power source 92, so the supplied power is AC power. When the AC power source 91 experiences a power outage, AC power is not supplied from the AC power source 91 and DC power is supplied from the DC power source 92, so the supplied power is DC power.

[0022] Building B1 has a distribution board 42 installed in each of the multiple dwelling units H1, H2, etc. within building B1. The distribution board 42 includes a master breaker 42a and multiple branch breakers 42b. The supply power distributed from the distribution board 41 to the distribution board 42 via the AC / DC power feed line L0 is sent via the master breaker 42a to multiple AC / DC power feed lines L1 branched by the multiple branch breakers 42b. The master breaker 42a corresponds to a switch device that connects or disconnects the AC / DC power feed line L0. Each of the multiple branch breakers 42b corresponds to a switch device that connects or disconnects the AC / DC power feed line L1. When the supply power is AC power, the master breaker 42a preferably includes a trip device that activates the opening / closing mechanism of the master breaker 42a to disconnect the power feed line when an overcurrent flows through the AC / DC power feed line L0. Furthermore, when the supplied power is AC power, the branch breaker 42b preferably includes a tripping device that activates the opening / closing mechanism of the branch breaker 42b to interrupt the power line when an overcurrent flows in the AC-DC power supply line L1. That is, when the supplied power is AC power, the master breaker 42a and the branch breakers 42b preferably interrupt the AC-DC power supply lines L0 and L1 when an overcurrent flows through the AC-DC power supply lines L0 and L1. Therefore, when the supplied power is AC power, the master breaker 42a and the branch breakers 42b can protect the AC-DC power supply lines L0 and L1 from overcurrent.

[0023] The multiple AC-DC power supply circuits L1 are electrical circuits for supplying power to each device in the dwelling unit H1. The devices in the dwelling unit H1 include disaster prevention lighting fixtures 81, regular lighting fixtures 82, air conditioning equipment 83, and outlets 84. The disaster prevention lighting fixtures 81 include DC equipment that uses DC power to turn on emergency light sources. The regular lighting fixtures 82 include AC equipment that uses AC power to turn on regular light sources. The air conditioning equipment 83 includes AC equipment that uses AC power to adjust the air conditioning environment in the dwelling unit H1. The outlets 84 include AC equipment that supplies AC power to devices plugged into the outlets 84. Hereinafter, when distinguishing between the multiple AC-DC power supply circuits L1, they will be referred to as AC-DC power supply circuits L11, L12, L13, etc. Furthermore, when distinguishing between the multiple AC power supply circuits L3, they will be referred to as AC power supply circuits L31, L32, L33, etc.

[0024] Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L11 is electrically connected to the DC power supply line L2 via a DC protection device 2, and is also electrically connected to the AC power supply line L31 via an AC protection device 3. Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L12 is electrically connected to the AC power supply line L32 via the AC protection device 3. Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L13 is electrically connected to the AC power supply line L33 via the AC protection device 3.

[0025] Specifically, the AC / DC power supply line L11 is electrically connected to a disaster prevention lighting fixture 81 via a DC protection device 2 and a DC power supply line L2, and is electrically connected to a regular lighting fixture 82 via an AC protection device 3 and an AC power supply line L31. The AC / DC power supply line L12 is electrically connected to an air conditioning device 83 via the AC protection device 3 and an AC power supply line L32. The AC / DC power supply line L13 is electrically connected to an outlet 84 via the AC protection device 3 and an AC power supply line L33. It is preferable that the AC power supply line L31 to which the regular lighting fixture 82 is electrically connected be provided with a light switch 5 for switching the regular lighting fixture 82 on and off.

[0026] The DC protection device 2 transmits only DC power from the AC-DC power supply line L1 to the DC power supply line L2, thereby supplying only DC power to DC devices such as the disaster prevention lighting fixture 81 and preventing AC power from being supplied to the DC devices. In other words, the DC protection device 2 protects the DC devices by preventing AC power from being supplied to the DC devices.

[0027] Moreover, the AC protection device 3 transmits only AC power from the AC-DC power supply line L1 to the AC power supply line L3, thereby supplying only AC power to AC devices such as the regular lighting fixture 82, the air conditioner 83, and the outlet 84, and preventing DC power from being supplied to the AC devices. In other words, the AC protection device 3 protects the AC devices by preventing DC power from being supplied to the AC devices.

[0028] In the power supply system 1 of FIG. 1, a DC protection device 2 (AC circuit breaker 2d) that supplies DC power to a disaster prevention lighting fixture 81 equipped with a DC device and an AC protection device 3 (DC circuit breaker 3d) that supplies AC power to a regular lighting fixture 82 equipped with an AC device are connected to a single AC-DC power supply line L11. That is, the lighting power supply line is a shared line system in which the disaster prevention lighting fixture 81 and the regular lighting fixture 82 use the same AC-DC power supply line L11. Specifically, one AC-DC power supply line L11 branches into two systems. One branch is electrically connected to the DC power supply line L2 of the disaster prevention lighting fixture 81 via the DC protection device 2. The other branch is electrically connected to the AC power supply line L31 of the regular lighting fixture 82 via the AC protection device 3.

[0029] Furthermore, the AC-DC power supply line L11 before branching is provided with a branching device 43. The branching device 43 branches the AC-DC power supply line L19 from the AC-DC power supply line L11.

[0030] In FIG. 1, the power supply line including the AC / DC power supply line L1, the DC power supply line L2, and the AC power supply line L3 is represented by a single line, but an actual power supply line includes at least two electric wires, bus bars, or conductors.

[0031] (2)DC protection device 2 shows a block configuration of the DC protection device 2. The DC protection device 2 includes an input unit 2a, an output unit 2b, a DC connection circuit 2c, and an AC breaker 2d.

[0032] The input unit 2a is electrically connected to the AC / DC power supply line L1 and receives power from the AC / DC power supply line L1. The input unit 2a has a conductor such as a terminal, solder, or a circuit pattern on a substrate to which the AC / DC power supply line L1 is electrically connected.

[0033] The output unit 2b is electrically connected to the DC power supply line L2 and outputs supply power (DC power) to the DC power supply line L2. The output unit 2b has a conductor such as a terminal, solder, or circuit pattern to which the DC power supply line L2 is electrically connected.

[0034] The DC connection electric path 2c is an electric path between the input part 2a and the output part 2b, and is made up of a conductor such as an electric wire, a circuit pattern on a board, or a bus bar.

[0035] The AC cutoff unit 2d switches between conduction and cutoff of the DC connecting electric circuit 2c. Specifically, the AC cutoff unit 2d includes a contact 21 and a determination unit 22.

[0036] The contact 21 is formed by at least a part of a mechanical relay or a semiconductor relay, and is connected in series with the DC connection circuit 2c. When the contact 21 is turned on, the DC connection circuit 2c is made conductive, and when the contact 21 is turned off, the DC connection circuit 2c is cut off. That is, when the contact 21 is turned on, the AC-DC power supply circuit L1 and the DC power supply circuit L2 are made conductive, and when the contact 21 is turned off, the AC-DC power supply circuit L1 and the DC power supply circuit L2 are cut off.

[0037] The determination unit 22 monitors the voltage of the AC-DC power supply line L1 and determines whether the power supplied by the AC-DC power supply line L1 is AC power or DC power. Based on the determination result, the determination unit 22 turns on the contact 21 if the supplied power is DC power, and turns off the contact 21 if the supplied power is AC power. The determination unit 22 may be configured with discrete components such as resistors, capacitors, and transistors, or may be configured with a computer that executes software to realize at least some of the functions of the determination unit 22.

[0038] FIG. 3 shows an example of the circuit configuration of the DC protection device 2.

[0039] The input unit 2a is composed of a pair of input terminals 201 and 202. The output unit 2b is composed of a pair of output terminals 203 and 204. The AC / DC power supply line L1 has a pair of electric circuits L1a and L1b, with the input terminal 201 connected to the electric circuit L1a and the input terminal 202 connected to the electric circuit L1b. The DC power supply line L2 has a pair of electric circuits L2a and L2b, with the output terminal 203 connected to the electric circuit L2a and the output terminal 204 connected to the electric circuit L2b.

[0040] The determination unit 22 includes resistors R1 to R3, capacitors C1 and C2, a triac Q1, a relay K1, and a drive coil K21 for the relay K2. The series circuit of the capacitor C1 and the resistors R1 and R2 is connected between a pair of input terminals 201 and 202, in the order of capacitor C1, resistor R1, and resistor R2, from the electrical path L1a to the electrical path L1b. The series circuit of the capacitor C1 and the resistors R1 and R2 is connected in parallel with the series circuit of the drive coil K11 for the relay K1 and the triac Q1. The gate of the triac Q1 is connected to the connection point of the resistors R1 and R2 via a resistor R3. The resistor R2 is connected in parallel with the capacitor C2. The series circuit of the contact K12 of the relay K1 and the drive coil K21 for the relay K2 is connected between the pair of input terminals 201 and 202.

[0041] The contact K21 is formed by the contact K22 of the relay K2. The contact K22 is a normally closed b-contact, and when no coil current flows through the drive coil K21, the contact K22 closes and the contact K21 turns on. When a coil current flows through the drive coil K21, the contact K22 opens and the contact K21 turns off.

[0042] The input terminal 201 is electrically connected to the output terminal 203 via the contact K22 (contact 21), and the input terminal 202 is electrically connected to the output terminal 204. The electric path between the input terminal 201 and the output terminal 203 and the electric path between the input terminal 202 and the output terminal 204 constitute the DC connection electric path 2c.

[0043] When DC power is sent to the AC-DC power supply circuit L1 as supply power, the input voltage V1 between the pair of circuits L1a and L1b becomes a DC voltage. At this time, a DC voltage is applied to the series circuit of capacitor C1 and resistors R1 and R2, but because capacitor C1 functions as a DC blocking capacitor, no gate current flows to the gate of triac Q1, turning triac Q1 off. When triac Q1 turns off, no coil current flows to drive coil K11, turning contact K12 off. When contact K12 turns off, no coil current flows to drive coil K21, turning contact K22 closed. Therefore, when DC power is sent to AC-DC power supply circuit L1 as supply power, contact K21 turns on, and DC connecting circuit 2c becomes conductive.

[0044] Furthermore, when AC power is sent to the AC-DC power supply circuit L1 as supply power, the input voltage V1 between the pair of circuits L1a and L1b becomes an AC voltage. At this time, an AC voltage is applied to the series circuit of capacitor C1 and resistors R1 and R2, causing a gate current to flow through the gate of triac Q1 and turning triac Q1 on. When triac Q1 turns on, a coil current flows through drive coil K11 and contact K12 turns on. When contact K12 turns on, a coil current flows through drive coil K21 and contact K22 opens. Therefore, when AC power is sent to AC-DC power supply circuit L1 as supply power, contact K21 turns off and DC connection circuit 2c is interrupted.

[0045] In the above-described DC protection device 2, an AC / DC power supply line L1 is connected to an input section 2a, and a DC power supply line L2 is connected to an output section 2b. If the power supplied through the AC / DC power supply line L1 is DC power, the DC protection device 2 establishes conduction between the AC / DC power supply line L1 and the DC power supply line L2, transmitting the DC power to the DC power supply line L2. The disaster prevention lighting device 81 receives DC power from the DC power supply line L2 and lights up. That is, the disaster prevention lighting device 81 lights up using DC power when the AC power source 91 experiences a power outage.

[0046] Furthermore, if the power supplied through the AC-DC power supply line L1 is AC power, the DC protection device 2 cuts off the connection between the AC-DC power supply line L1 and the DC power supply line L2, preventing AC power from being transmitted to the DC power supply line L2. Since the disaster prevention lighting fixture 81 does not receive AC power from the DC power supply line L2, the DC equipment of the disaster prevention lighting fixture 81 is protected. At this time, the disaster prevention lighting fixture 81 is turned off.

[0047] Therefore, the DC protection device 2 can achieve both operation and protection of the DC equipment of the disaster prevention lighting fixture 81 by using the AC / DC power supply lines L0, L1 that selectively transmit either AC power or DC power.

[0048] Moreover, the overcurrent protection unit 2e (see FIG. 2) monitors the magnitude of the current (DC current) flowing through the DC power supply line L2 and compares the magnitude of the DC current with a threshold value. When the magnitude of the DC current exceeds the threshold value, the overcurrent protection unit 2e determines that an overcurrent has occurred and turns off the contact 21. That is, when the supplied power is DC power, the overcurrent protection unit 2e cuts off the DC connection circuit 2c when an overcurrent flows through the DC power supply line L2. Therefore, the DC protection device 2 can protect the DC power supply line L2 from overcurrent when the supplied power is DC power.

[0049] (3)AC protection device 4 shows a block configuration of the AC protection device 3. The AC protection device 3 includes an input unit 3a, an output unit 3b, an AC connection circuit 3c, and a DC interrupter 3d.

[0050] The input unit 3a is electrically connected to the AC / DC power supply line L1 and receives power from the AC / DC power supply line L1. The input unit 3a has a conductor such as a terminal, solder, or a circuit pattern on a substrate to which the AC / DC power supply line L1 is electrically connected.

[0051] The output unit 3b is electrically connected to the AC power supply line L3 and outputs supply power (AC power) to the AC power supply line L3. The output unit 3b has a conductor such as a terminal, solder, or circuit pattern to which the AC power supply line L3 is electrically connected.

[0052] The AC connection electric circuit 3c is an electric circuit between the input part 3a and the output part 3b, and is made up of a conductor such as an electric wire, a circuit pattern on a board, or a bus bar.

[0053] The DC cutoff unit 3d switches between conduction and cutoff of the AC connecting electric circuit 3c. Specifically, the DC cutoff unit 3d includes a contact 31 and a determination unit 32.

[0054] The contact 31 is formed of at least a part of a mechanical relay or a semiconductor relay, and is connected in series with the AC connecting electric circuit 3c. When the contact 31 is turned on, the AC connecting electric circuit 3c is made conductive, and when the contact 31 is turned off, the AC connecting electric circuit 3c is cut off. That is, when the contact 31 is turned on, the AC / DC power supply line L1 and the AC power supply line L3 are made conductive, and when the contact 31 is turned off, the AC / DC power supply line L1 and the AC power supply line L3 are cut off.

[0055] The determination unit 32 monitors the voltage of the AC-DC power supply line L1 and determines whether the power supplied by the AC-DC power supply line L1 is AC power or DC power. Based on the determination result, the determination unit 32 turns on the contact 31 if the supplied power is AC power, and turns off the contact 31 if the supplied power is DC power. The determination unit 32 may be configured with discrete components such as resistors, capacitors, and transistors, or may be configured with a computer that executes software to realize at least some of the functions of the determination unit 32.

[0056] FIG. 4 shows an example of the circuit configuration of the AC protection device 3.

[0057] The input unit 3a is composed of a pair of input terminals 301 and 302. The output unit 3b is composed of a pair of output terminals 303 and 304. The AC / DC power supply line L1 has a pair of electric paths L1a and L1b, with the input terminal 301 connected to the electric path L1a and the input terminal 302 connected to the electric path L1b. The AC power supply line L3 has a pair of electric paths L3a and L3b, with the output terminal 303 connected to the electric path L3a and the output terminal 304 connected to the electric path L3b.

[0058] The determination unit 32 includes resistors R11 to R13, capacitors C11 and C12, a triac Q2, a relay K3, and a drive coil K41 for a relay K4. The series circuit of the capacitor C11 and resistors R11 and R12 is connected between a pair of input terminals 301 and 302, in the order of capacitor C11, resistor R11, and resistor R12, from the electrical path L1a to the electrical path L1b. The series circuit of the capacitor C11, resistors R11, and R12 is connected in parallel with the series circuit of the drive coil K31 for the relay K3 and a triac Q2. The gate of the triac Q2 is connected to the connection point of the resistors R11 and R12 via a resistor R13. The resistor R12 is connected in parallel with the capacitor C12. The series circuit of the contact K32 of the relay K3 and the drive coil K41 for the relay K4 is connected between the pair of input terminals 301 and 302.

[0059] The contact 31 is formed by the contact K42 of the relay K4. The contact K42 is a normally open a-contact, and when no coil current flows through the drive coil K41, the contact K42 opens and the contact 31 turns off. When a coil current flows through the drive coil K41, the contact K42 closes and the contact 31 turns on.

[0060] The input terminal 301 is electrically connected to the output terminal 303 via the contact K42 (contact 31), and the input terminal 302 is electrically connected to the output terminal 304. The electric path between the input terminal 301 and the output terminal 303 and the electric path between the input terminal 302 and the output terminal 304 constitute the AC connection electric path 3c.

[0061] When AC power is sent to the AC-DC power supply circuit L1 as supply power, the input voltage V1 between the pair of circuits L1a and L1b becomes an AC voltage. At this time, an AC voltage is applied to the series circuit of capacitor C11 and resistors R11 and R12, causing a gate current to flow through the gate of triac Q2 and turning on triac Q2. When triac Q2 turns on, a coil current flows through drive coil K31 and turns on contact K32. When contact K32 turns on, a coil current flows through drive coil K41 and contact K42 is closed. Therefore, when AC power is sent to the AC-DC power supply circuit L1 as supply power, contact K31 turns on and AC connecting circuit 3c becomes conductive.

[0062] Furthermore, when DC power is sent to the AC-DC power supply circuit L1 as the supply power, the input voltage V1 between the pair of circuits L1a and L1b becomes a DC voltage. At this time, a DC voltage is applied to the series circuit of capacitor C11 and resistors R11 and R12. However, because capacitor C11 functions as a DC blocking capacitor, no gate current flows to the gate of triac Q2, turning triac Q2 off. When triac Q2 turns off, no coil current flows through drive coil K31, turning contact K32 off. When contact K32 turns off, no coil current flows through drive coil K41, turning contact K42 closed. Therefore, when DC power is sent to AC-DC power supply circuit L1 as the supply power, contact K31 turns off, and the AC connection circuit 3c is interrupted.

[0063] In the above-described AC protection device 3, an AC / DC power supply line L1 is connected to an input section 3a, and an AC power supply line L3 is connected to an output section 3b. When the power supplied through the AC / DC power supply line L1 is AC power, the AC protection device 3 establishes electrical continuity between the AC / DC power supply line L1 and the AC power supply line L3, transmitting the AC power to the AC power supply line L3. The utility lighting fixture 82, the air conditioner 83, and the outlet 84 operate by receiving AC power from the AC power supply line L3. That is, when the AC power source 91 is energized, the utility lighting fixture 82 is turned on by AC power when the light switch 5 is turned on, and is turned off when the light switch 5 is turned off. When the AC power source 91 is energized, the air conditioner 83 operates by AC power, and the outlet 84 supplies AC power to devices plugged into the outlet 84.

[0064] Furthermore, if the power supplied through AC-DC power supply line L1 is DC power, AC protection device 3 breaks the connection between AC-DC power supply line L1 and AC power supply line L3, preventing DC power from being transmitted to AC power supply line L3. Since normal lighting fixture 82, air conditioner 83, and outlet 84 are not supplied with DC power from AC power supply line L3, the AC devices contained in normal lighting fixture 82, air conditioner 83, and outlet 84 are protected. In this state, normal lighting fixture 82 is turned off, air conditioner 83 is stopped, and outlet 84 does not supply power.

[0065] Therefore, the AC protection device 3 can simultaneously operate and protect the AC equipment contained in each of the regular lighting fixtures 82, the air conditioning equipment 83, and the outlets 84, by using the AC / DC power supply lines L0 and L1 that selectively transmit either AC power or DC power.

[0066] (4) Operation of the power supply system The power supply system 1 equipped with the above-described DC protection device 2 and AC protection device 3 operates as follows.

[0067] When the AC power source 91 is energized, the switchboard 41 transmits AC power from the AC power source 91 to the AC-DC power supply line L0. The distribution board 42 branches the AC power from the AC-DC power supply line L0 into multiple AC-DC power supply lines L1 via multiple branch breakers 42b. As shown in FIG. 1 , the AC circuit breaker 2d of the DC protection device 2 is turned off, and the DC circuit breaker 3d of the AC protection device 3 is turned on. Therefore, when the AC power source 91 is energized, the disaster prevention lighting fixture 81 connected to the DC protection device 2 is turned off, and the regular lighting fixture 82 connected to the AC protection device 3 is turned on or off depending on whether the light switch 5 is turned on or off. In addition, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 can perform the functions of their respective AC devices.

[0068] In the event of a power outage of the AC power supply 91, the distribution board 41 transmits DC power from the DC power supply 92 to the AC-DC power supply line L0. The distribution board 42 branches the DC power from the AC-DC power supply line L0 into multiple AC-DC power supply lines L1 via multiple branch breakers 42b. As shown in FIG. 6, the AC breaker 2d of the DC protection device 2 is turned on, and the DC breaker 3d of the AC protection device 3 is turned off. Therefore, in the event of a power outage of the AC power supply 91, the disaster prevention lighting fixture 81 connected to the DC protection device 2 is turned on, and the regular lighting fixture 82 connected to the AC protection device 3 is turned off. In addition, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 are unable to perform their respective AC device functions.

[0069] 7A shows a block configuration of disaster prevention lighting fixture 81. Disaster prevention lighting fixture 81 has DC equipment 81a housed in fixture body 8A, and includes emergency lighting circuit 811 and emergency light source 812 as DC equipment 81a.

[0070] The emergency light source 812 includes at least one solid-state light-emitting element. For example, the emergency light source 812 includes an LED array in which a plurality of LEDs (Light Emitting Diodes) are connected in series as the plurality of solid-state light-emitting elements. Note that the emergency light source 812 is not limited to a configuration including LEDs as the solid-state light-emitting elements. The emergency light source 812 may include other solid-state light-emitting elements, such as organic electroluminescence (OEL) or semiconductor laser diodes (laser diodes, LD).

[0071] The emergency lighting circuit 811 is a switching power supply circuit. The switching power supply circuit may be configured, for example, with an isolated flyback converter, but is not limited to a specific configuration. Upon receiving DC power from the DC power supply line L2, the emergency lighting circuit 811 converts the DC power into DC load power and supplies the DC load current to the emergency light source 812, thereby lighting the emergency light source 812. In other words, the emergency lighting circuit 811 converts the DC power into load power, and the emergency light source 812 is lighted by the load power.

[0072] 7B shows a block configuration of the regular lighting fixture 82. The regular lighting fixture 82 has an AC device 82a housed in a fixture body 8B, and includes a regular lighting circuit 821 and a regular light source 822 as the AC device 82a.

[0073] The common light source 822 includes at least one solid-state light-emitting element. For example, the common light source 822 includes an LED array in which a plurality of LEDs are connected in series as the plurality of solid-state light-emitting elements. Note that the common light source 822 is not limited to a configuration in which an LED is included as the solid-state light-emitting element. The common light source 822 may include, for example, another solid-state light-emitting element such as an organic EL or a semiconductor laser diode.

[0074] The service lighting circuit 821 is a switching power supply circuit. The switching power supply circuit may be configured with, for example, an isolated flyback converter, but is not limited to a specific configuration. When the service lighting circuit 821 receives AC power from the AC power supply line L3, it converts the AC power into DC load power and supplies the DC load current to the service light source 822, thereby lighting the service light source 822. In other words, the service lighting circuit 821 converts AC power into load power, and the service light source 822 is lighted by the load power.

[0075] As shown in Fig. 8, the power supply system 1 may use a lighting fixture 80 that integrates a disaster prevention lighting fixture 81 (Fig. 7A) and a regular lighting fixture 82 (Fig. 7B). The lighting fixture 80 houses the DC device 81a and the AC device 82a described above in a fixture body 8C. That is, the lighting fixture 80 serves as both the disaster prevention lighting fixture 81 and the regular lighting fixture 82.

[0076] The above-described disaster prevention lighting fixture 81 and lighting fixture 80 are separate-power-source type disaster prevention lighting fixtures that receive power from a DC power supply 92 configured separately from the fixture body and turn on the emergency light source 812 in an emergency. By combining such separate-power-source type disaster prevention lighting fixtures with the above-described DC protection device 2, the power supply system 1 can use AC / DC power feed lines L0 and L1 that selectively transmit either AC power or DC power. Therefore, the power supply system 1 can use the separate-power-source type disaster prevention lighting fixtures while reducing the installation length of the DC power feed line L2 that transmits only DC power. Furthermore, by using the separate-power-source type disaster prevention lighting fixtures, the power supply system 1 can easily inspect the storage battery 92a of the DC power supply 92.

[0077] (5) First Modification FIG. 9 shows a configuration of a power supply system 1A as a modified example of the power supply system 1. As shown in FIG.

[0078] In the power supply system 1A, an AC circuit breaker 2d (DC protection device 2) that supplies DC power to disaster prevention lighting fixtures 81 equipped with DC devices and a DC circuit breaker 3d (AC protection device 3) that supplies AC power to regular use lighting fixtures 82 equipped with AC devices are connected to different AC / DC power feed paths L101 and L102, respectively, out of two or more AC / DC power feed paths L1. In other words, the power feed paths for lighting are a dedicated line system in which the AC / DC power feed path L101 used by the disaster prevention lighting fixtures 81 and the AC / DC power feed path L102 used by the regular use lighting fixtures 82 are different.

[0079] Specifically, the supply power distributed from switchboard 41 to distribution board 42 via AC / DC power supply line L0 is sent via main breaker 42a to multiple AC / DC power supply lines L1 branched by multiple branch breakers 42b. Note that hereinafter, when the multiple AC / DC power supply lines L1 are distinguished from one another, they will be referred to as AC / DC power supply lines L101, L102, L103, etc. Furthermore, when the multiple AC power supply lines L3 are distinguished from one another, they will be referred to as AC power supply lines L301, L302, L303, etc.

[0080] Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L101 is electrically connected to the DC power supply line L2 via a DC protection device 2. Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L102 is electrically connected to the AC power supply line L301 via an AC protection device 3. Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L103 is electrically connected to the AC power supply line L302 via the AC protection device 3. Of the multiple AC-DC power supply lines L1, the AC-DC power supply line L104 is electrically connected to the AC power supply line L303 via the AC protection device 3.

[0081] The AC / DC power supply line L101 is electrically connected to the emergency lighting fixture 81 via the DC protection device 2 and the DC power supply line L2. The AC / DC power supply line L102 is electrically connected to the regular lighting fixture 82 via the AC protection device 3 and the AC power supply line L301. The AC / DC power supply line L103 is electrically connected to the outlet 84 via the AC protection device 3 and the AC power supply line L302. The AC / DC power supply line L104 is electrically connected to the air conditioning equipment 83 via the AC protection device 3 and the AC power supply line L303. It is preferable that the AC power supply line L301 to which the regular lighting fixture 82 is electrically connected be provided with a light switch 5 for switching the regular lighting fixture 82 on and off.

[0082] When the AC power supply 91 is energized, the distribution board 41 sends AC power from the AC power supply 91 to the AC-DC power supply line L0. The distribution board 42 branches the AC power from the AC-DC power supply line L0 into multiple AC-DC power supply lines L1 via multiple branch breakers 42b. Then, the AC breaker 2d of the DC protection device 2 is turned off, and the DC breaker 3d of the AC protection device 3 is turned on. Therefore, when the AC power supply 91 is energized, the disaster prevention lighting fixture 81 connected to the DC protection device 2 is turned off, and the regular lighting fixture 82 connected to the AC protection device 3 is turned on or off depending on whether the light switch 5 is turned on or off. In addition, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 can perform the functions of their respective AC devices.

[0083] In the event of a power outage of the AC power supply 91, the distribution board 41 transmits DC power from the DC power supply 92 to the AC-DC power supply line L0. The distribution board 42 branches the DC power from the AC-DC power supply line L0 into multiple AC-DC power supply lines L1 via multiple branch breakers 42b. As shown in FIG. 9 , the AC breaker 2d of the DC protection device 2 is turned on, and the DC breaker 3d of the AC protection device 3 is turned off. Therefore, in the event of a power outage of the AC power supply 91, the disaster prevention lighting fixture 81 connected to the DC protection device 2 is turned on, and the regular lighting fixture 82 connected to the AC protection device 3 is turned off. In addition, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 are unable to perform their respective AC device functions.

[0084] (6) Second Modification 10A, 10B, 11A, and 11B each show a modified example of the lighting fixture.

[0085] 10A includes a DC protection device 2 and a DC power supply line L2 in addition to a DC device 81a, and the DC device 81a, the DC protection device 2, and the DC power supply line L2 are housed in a device body 8D. That is, the disaster prevention lighting device 81A integrally includes the DC device 81a, the DC protection device 2, and the DC power supply line L2.

[0086] 10B includes an AC device 82a, an AC protection device 3, and an AC power supply line L3, and the AC device 82a, AC protection device 3, and AC power supply line L3 are housed in a fixture body 8E. That is, the AC device 82a, AC protection device 3, and AC power supply line L3 are integrally included in the ordinary lighting fixture 82A.

[0087] As shown in Fig. 11A, the power supply system 1 may use a lighting fixture 80A that integrates a disaster prevention lighting fixture 81A (see Fig. 10A) and a regular lighting fixture 82A (see Fig. 10B). The lighting fixture 80A includes a fixture body 8F into which two AC / DC power supply lines L1 are connected, and the fixture body 8F houses the DC protection device 2, AC protection device 3, DC power supply line L2, AC power supply line L3, DC device 81a, and AC device 82a. In other words, the lighting fixture 80A uses the two AC / DC power supply lines L1 to function as both the disaster prevention lighting fixture 81A and the regular lighting fixture 82A.

[0088] 11B includes a fixture body 8G into which one AC / DC power supply line L1 is drawn, and the fixture body 8G houses the above-described DC protection device 2, AC protection device 3, DC power supply line L2, AC power supply line L3, DC device 81a, and AC device 82a. In other words, lighting fixture 80B uses one AC / DC power supply line L1 to function as both disaster prevention lighting fixture 81A and general-use lighting fixture 82A.

[0089] (7) Third Modification Lighting fixture 80C in FIG. 12A includes a single protection device 6 having the functions of DC protection device 2 and AC protection device 3, instead of DC protection device 2 and AC protection device 3 of lighting fixture 80B (see FIG. 11B).

[0090] 12B shows the configuration of the protection device 6. The protection device 6 includes an input unit 6a, output units 6b and 6c, a DC connection circuit 6d, an AC connection circuit 6e, and a breaker unit 6f.

[0091] The input unit 6a is electrically connected to the AC / DC power supply line L1 and receives power from the AC / DC power supply line L1. The input unit 6a has a conductor such as a terminal, solder, or a circuit pattern on a board to which the AC / DC power supply line L1 is electrically connected.

[0092] The output unit 6b is electrically connected to the DC power supply line L2 and outputs supply power (DC power) to the DC power supply line L2. The output unit 6b has a conductor such as a terminal, solder, or circuit pattern to which the DC power supply line L2 is electrically connected.

[0093] The output unit 6c is electrically connected to the AC power supply line L3 and outputs supply power (AC power) to the AC power supply line L3. The output unit 6c has a conductor such as a terminal, solder, or circuit pattern to which the AC power supply line L3 is electrically connected.

[0094] The DC connection electric path 6d is an electric path between the input part 6a and the output part 6b, and is made up of a conductor such as an electric wire, a circuit pattern on a board, or a bus bar.

[0095] The AC connection electric circuit 6e is an electric circuit between the input portion 6a and the output portion 6c, and is made up of a conductor such as an electric wire, a circuit pattern on a board, or a bus bar.

[0096] The circuit breaker 6f has the functions of both the AC circuit breaker 2d (see FIG. 2) and the DC circuit breaker 3d (see FIG. 4). The circuit breaker 6f switches between conduction and cut-off of the DC connecting electric circuit 6d and between conduction and cut-off of the AC connecting electric circuit 6e. Specifically, the circuit breaker 6f includes contacts 61 and 62 and a determination unit 63.

[0097] The contact 61 is formed by at least a part of a mechanical relay or a semiconductor relay, and is connected in series with the DC connecting circuit 6d. When the contact 61 is turned on, the DC connecting circuit 6d is made conductive, and when the contact 61 is turned off, the DC connecting circuit 6d is cut off. That is, when the contact 61 is turned on, the AC-DC power supply circuit L1 and the DC power supply circuit L2 are made conductive, and when the contact 61 is turned off, the AC-DC power supply circuit L1 and the DC power supply circuit L2 are cut off.

[0098] The contact 62 is formed of at least a part of a mechanical relay or a semiconductor relay, and is connected in series to the AC connecting electric circuit 6e. When the contact 62 is turned on, the AC connecting electric circuit 6e is made conductive, and when the contact 62 is turned off, the AC connecting electric circuit 6e is cut off. That is, when the contact 62 is turned on, the AC / DC power supply line L1 and the AC power supply line L3 are made conductive, and when the contact 62 is turned off, the AC / DC power supply line L1 and the AC power supply line L3 are cut off.

[0099] The determination unit 63 monitors the voltage of the AC-DC power supply line L1 and determines whether the power supplied by the AC-DC power supply line L1 is AC power or DC power. Based on the determination result, if the supplied power is DC power, the determination unit 63 turns on contact 61 and turns off contact 62. If the supplied power is AC power, the determination unit 63 turns off contact 61 and turns on contact 62. The determination unit 63 may be configured with discrete components such as resistors, capacitors, and transistors, or may be configured with a computer that executes software to realize at least some of the functions of the determination unit 63.

[0100] FIG. 13 shows an example of the circuit configuration of the protection device 6.

[0101] The input unit 6a is composed of a pair of input terminals 601 and 602. The output unit 6b is composed of a pair of output terminals 603 and 605. The output unit 6c is composed of a pair of output terminals 604 and 605. The AC / DC power supply line L1 has a pair of electric paths L1a and L1b, with the input terminal 601 connected to the electric path L1a and the input terminal 602 connected to the electric path L1b. The DC power supply line L2 has a pair of electric paths L2a and L0a, with the output terminal 603 connected to the electric path L2a and the output terminal 605 connected to the electric path L0a. The AC power supply line L3 has a pair of electric paths L3a and L0a, with the output terminal 604 connected to the electric path L3a and the output terminal 605 connected to the electric path L0a.

[0102] The determination unit 63 includes resistors R21 to R23, capacitors C21 and C22, a triac Q3, a relay K5, a drive coil K61 for relay K6, and a drive coil K71 for relay K7. A series circuit of the capacitor C21 and resistors R21 and R22 is connected between a pair of input terminals 601 and 602, in the order of capacitor C21, resistor R21, and resistor R22, from the electrical path L1a to the electrical path L1b. A series circuit of the capacitor C21, resistors R21, and R22 is connected in parallel with a drive coil K51 for relay K5 and a series circuit of triac Q3. The gate of triac Q3 is connected to the junction of the resistors R21 and R22 via resistor R23. A capacitor C22 is connected in parallel with resistor R22.

[0103] The contact K52 of the relay K5 is a c-contact having a movable terminal T1, a normally open terminal T2, and a normally closed terminal T3. Therefore, when no coil current flows through the drive coil K51 of the relay K5, the movable terminal T1 and the normally open terminal T2 are disconnected, and the movable terminal T1 and the normally closed terminal T3 are connected. When a coil current flows through the drive coil K51 of the relay K5, the movable terminal T1 and the normally open terminal T2 are connected, and the movable terminal T1 and the normally closed terminal T3 are disconnected.

[0104] A normally closed terminal T3 of contact K52 is electrically connected to an input terminal 601 via a drive coil K61 of a relay K6. A normally open terminal T2 of contact K52 is electrically connected to an input terminal 601 via a drive coil K71 of a relay K7. A movable terminal T1 of contact K52 is electrically connected to an input terminal 602.

[0105] The contact 61 is formed by the contact K62 of the relay K6. The contact K62 is a normally open a-contact, and when no coil current flows through the drive coil K61, the contact K62 opens and the contact 61 turns off. When a coil current flows through the drive coil K61, the contact K62 closes and the contact 61 turns on.

[0106] The contact 62 is formed by the contact K72 of the relay K7. The contact K72 is a normally open a-contact, and when no coil current flows through the drive coil K71, the contact K72 opens and the contact 62 turns off. When a coil current flows through the drive coil K71, the contact K72 closes and the contact 62 turns on.

[0107] The input terminal 601 is electrically connected to the output terminal 603 via the contact K62 (contact 61). The input terminal 601 is electrically connected to the output terminal 604 via the contact K72 (contact 62). The input terminal 602 is electrically connected to the output terminal 605. The electric path between the input terminal 601 and the output terminal 603 and the electric path between the input terminal 602 and the output terminal 605 constitute a DC connection electric path 6d. The electric path between the input terminal 601 and the output terminal 604 and the electric path between the input terminal 602 and the output terminal 605 constitute an AC connection electric path 6e.

[0108] When DC power is supplied to AC / DC power supply circuit L1, the input voltage V1 between the pair of circuits L1a and L1b becomes a DC voltage. At this time, a DC voltage is applied to the series circuit consisting of capacitor C21 and resistors R21 and R22. However, because capacitor C21 functions as a DC blocking capacitor, no gate current flows through the gate of triac Q3, turning triac Q3 off. When triac Q3 turns off, no coil current flows through drive coil K51, blocking the connection between movable terminal T1 and normally open terminal T2 and establishing continuity between movable terminal T1 and normally closed terminal T3. As a result, coil current flows through drive coil K61, closing contact K62. Furthermore, no coil current flows through drive coil K71, opening contact K72. Therefore, when DC power is sent as supply power to the AC / DC power supply line L1, the contact 61 turns on, the DC connecting line 6d becomes conductive, and the contact 62 turns off, the AC connecting line 6e becomes disconnected.

[0109] Furthermore, when AC power is sent to the AC-DC power supply circuit L1 as supply power, the input voltage V1 between the pair of circuits L1a and L1b becomes an AC voltage. At this time, an AC voltage is applied to the series circuit of capacitor C21 and resistors R21 and R22, causing a gate current to flow through the gate of triac Q3, turning triac Q3 on. When triac Q3 turns on, a coil current flows through drive coil K51, establishing conduction between movable terminal T1 and normally open terminal T2 and interrupting conduction between movable terminal T1 and normally closed terminal T3. As a result, a coil current flows through drive coil K71, closing contact K72. Furthermore, no coil current flows through drive coil K61, opening contact K62. Therefore, when AC power is sent to the AC / DC power supply line L1 as supply power, the contact 62 turns on, the AC connecting line 6e becomes conductive, and the contact 61 turns off, the DC connecting line 6d becomes disconnected.

[0110] If the power supplied through the AC-DC power supply line L1 is DC power, the protection device 6 connects the AC-DC power supply line L1 to the DC power supply line L2 and disconnects the AC-DC power supply line L1 from the AC power supply line L3, thereby transmitting the DC power to the DC power supply line L2. If the power supplied through the AC-DC power supply line L1 is AC power, the protection device 6 connects the AC-DC power supply line L1 to the AC power supply line L3 and disconnects the AC-DC power supply line L1 from the DC power supply line L2, thereby transmitting the AC power to the AC power supply line L3.

[0111] Therefore, the protection device 6 can operate and protect DC devices at the same time by using the AC / DC power supply lines L0 and L1 that selectively transmit either AC power or DC power.

[0112] (8) Fourth Modification Lighting fixture 80 of FIG. 8, lighting fixture 80A of FIG. 11A, lighting fixture 80B of FIG. 11B, and lighting fixture 80C of FIG. 12A may include a dual-purpose light source 800 shown in FIG. 14 instead of emergency light source 812 and normal light source 822. Dual-purpose light source 800 includes at least one solid-state light-emitting element. Dual-purpose light source 800 is lit by an emergency lighting circuit 811 if the supplied power is DC power, and is lit by a normal lighting circuit 821 if the supplied power is AC power. Note that it is preferable to make the light output of dual-purpose light source 800 by emergency lighting circuit 811 different from the light output of dual-purpose light source 800 by normal lighting circuit 821.

[0113] The lighting fixture of Fig. 14 may be provided with a lighting circuit 801 shown in Fig. 15 instead of the emergency lighting circuit 811 and the normal lighting circuit 821. The lighting circuit 801 has the above-mentioned DC protection device 2 and AC protection device 3 built in, and turns on the dual-purpose light source 800 in an emergency if the supplied power is DC power, and turns on the dual-purpose light source 800 in normal lighting if the supplied power is AC power. It is preferable that the lighting circuit 801 differentiates the light output of the dual-purpose light source 800 during emergency lighting from the light output of the dual-purpose light source 800 during normal lighting.

[0114] (9) Fifth Modification At least one of the DC protection device 2 and the AC protection device 3 may be built into the branch breaker 42b.

[0115] In addition, at least one of the regular lighting fixture 82, the air conditioner 83, and the outlet 84 may have the AC protection device 3 built in.

[0116] The switchboard 41 and the DC power supply unit 44 may be installed on the roof or in an electrical room of the building B1.

[0117] (10) Summary As described above, the protection device (2) for DC devices according to the first aspect of the embodiment includes an input unit (2a), an output unit (2b), and an AC breaker (2d). The input unit (2a) is connected to an AC / DC power supply line (L1) that supplies power from one of a plurality of external power sources (9) including at least one AC power source (91) and at least one DC power source (92). The output unit (2b) is connected to a DC power supply line (L2) that supplies power to the DC device (81a). The AC breaker (2d) switches the DC connection line (2c) between the input unit (2a) and the output unit (2b) between conduction and interruption. The AC breaker (2d) turns on the DC connection line (2c) if the supplied power is DC power, and interrupts the DC connection line (2c) if the supplied power is AC power.

[0118] The above-mentioned DC equipment protection device (2) can simultaneously operate and protect the DC equipment (81a) of the disaster prevention lighting fixture (81) by using an AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

[0119] In the protection device (2) for a DC device according to the second aspect of the embodiment, in the first aspect, the AC breaker (2d) preferably includes a determination unit (22) that determines whether the supplied power is DC power or AC power, and a contact (21) that is provided in series with the DC connection electric circuit (2c). Based on the determination result of the determination unit (22), the contact (21) is turned on if the supplied power is DC power, and turned off if the supplied power is AC power.

[0120] The above-mentioned DC equipment protection device (2) can simultaneously operate and protect the DC equipment (81a) of the disaster prevention lighting fixture (81) by using an AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

[0121] A power supply system (1) according to a third aspect of the embodiment includes the DC device protection device (2) according to the first or second aspect, an AC / DC power supply line (L1), and a DC power supply line (L2).

[0122] The above-described power supply system (1) can simultaneously operate and protect the DC equipment (81a) of the disaster prevention lighting fixture (81) by using an AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

[0123] In the power supply system (1) of the fourth aspect of the embodiment, in the third aspect, when the supply power is DC power, the protection device (2) for the DC equipment preferably cuts off the DC connection circuit (2c) when an overcurrent flows in the DC power supply line (L2).

[0124] The above-described power supply system (1) can protect the DC power supply line (L2) from overcurrent when the supplied power is DC power.

[0125] Preferably, the power supply system (1) of the fifth aspect according to the embodiment is the third or fourth aspect, further including a switch device (42a, 42b) that connects or disconnects the AC / DC power supply lines (L0, L1).

[0126] The above-described power supply system (1) can easily switch the power supply to devices within the system.

[0127] In the power supply system (1) of the sixth aspect according to the embodiment, in the fifth aspect, when the supply power is AC power, it is preferable that the switch devices (42a, 42b) interrupt the AC / DC power supply lines (L0, L1) when an overcurrent flows in the AC / DC power supply lines (L0, L1).

[0128] The above-described power supply system (1) can protect the AC / DC power supply lines (L0, L1) from overcurrent when the supplied power is AC power.

[0129] The power supply system (1) according to a seventh aspect of the present embodiment is preferably any one of the third to sixth aspects, further including a DC circuit breaker (3d) that switches between conduction and interruption of the AC connection electric circuit (3c) between the AC power supply line (L3) that supplies power to the AC device (82a) and the AC-DC power supply line (L1). The DC circuit breaker (3d) turns on the AC connection electric circuit (3c) if the supply power is AC power, and interrupts the AC connection electric circuit (3c) if the supply power is DC power.

[0130] The above-described power supply system (1) can achieve both operation and protection of the AC device (82a) by using the AC / DC power supply line (L1) that selectively supplies either AC power or DC power.

[0131] In the power supply system (1) of the eighth aspect of the embodiment, in the seventh aspect, it is preferable that the AC circuit breaker (2d) that supplies DC power to the disaster prevention lighting fixture (81) having the DC device (81a) and the DC circuit breaker (3d) that supplies AC power to the regular lighting fixture (82) having the AC device (82a) are connected to one AC / DC power supply line (L11).

[0132] The above-described power supply system (1) may be configured as a shared line system for the lighting power supply line, in which the disaster prevention lighting fixtures (81) and the regular lighting fixtures (82) use the same AC / DC power supply line (L11).

[0133] In the power supply system (1) of the ninth aspect according to the embodiment, the number of AC / DC power supply lines (L1) is two or more in the seventh aspect. An AC breaker (2d) that supplies DC power to a disaster prevention lighting fixture (81) having a DC device (81a) and a DC breaker (3d) that supplies AC power to a regular lighting fixture (82) having an AC device (82a) are connected to different AC / DC power supply lines (L101, L102) of the two or more AC / DC power supply lines (L1), respectively. The above-described power supply system (1) may be configured as a shared line system for the lighting power supply line, in which the disaster prevention lighting fixtures (81) and the regular lighting fixtures (82) use the same AC / DC power supply line (L11).

[0134] A lighting fixture (81A, 80A to 80C) according to a tenth aspect of the present embodiment includes the DC device protection device (2) according to the first or second aspect, a DC power supply line (L2), and a DC device (81a). The DC device (81a) includes a lighting circuit (811) that converts DC power into load power, and a light source (812) that lights up using the load power.

[0135] The above-mentioned lighting fixtures (81A, 80A to 80C) can simultaneously operate and protect the DC device (81a) of the disaster prevention lighting fixture (81) by using an AC / DC power supply line (L1) that selectively transmits either AC power or DC power. [Explanation of symbols]

[0136] 1. Power supply system 2 DC protection device (protection device) 2a Input section 2b Output section 2c DC connection circuit 2d AC interrupter 21 Contacts 22 Judgment section 3c AC connection line 3d DC interrupter 42a Main breaker (switch device) 42b Branch breaker (switch device) 81 Disaster prevention lighting equipment 81A, 80A~80C Disaster prevention lighting equipment (lighting equipment) 81a DC equipment 811 Emergency lighting circuit (lighting circuit) 812 Emergency light source (light source) 82 Regular lighting equipment 82a AC equipment 91 AC power supply 92 DC power supply 9 External power supply L0, L1, L11, L101, L102 AC / DC feed line L2 DC feed line L3 AC feed line

Claims

1. an input section connected to an AC / DC power supply line that transmits power from any of a plurality of external power sources including at least one AC power source and at least one DC power source; DC equipment, AC equipment and an AC breaker that switches between conduction and interruption of a DC connection path between a DC power supply path that supplies the supply power to the DC device and the AC / DC power supply path; a DC interruption unit that switches between conduction and interruption of an AC connection path between an AC power supply path that supplies the supply power to the AC device and the AC-DC power supply path, The AC cutoff unit is If the supply power is DC power, the DC connection circuit is made conductive; If the supplied power is AC power, the DC connection circuit is interrupted; The DC interrupter is If the supplied power is AC power, the AC connection circuit is energized; If the supplied power is DC power, the AC connection circuit is interrupted; The DC device is a first lighting circuit that converts the DC power into first load power; a first light source that is lit by the first load power supplied from the first lighting circuit, The AC device is a second lighting circuit that converts the AC power into second load power; a second light source that is lit by the second load power supplied from the second lighting circuit, Lighting fixtures.

2. A disaster prevention lighting fixture including the DC device; and a regular lighting fixture including the AC device, The normal lighting fixture lights up when the AC power supply is energized, The disaster prevention lighting device is turned on when the AC power supply is powered off.

10. The lighting fixture of claim 1.

3. The AC cutoff unit and the DC cutoff unit are connected to one of the AC / DC power supply paths.

3. A lighting fixture according to claim 1 or 2.

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