Power supply system

Abstract

To provide a protective device, a power supply system, and a lighting fixture that can both operate and protect DC equipment by using an alternating feeder that selectively transmits either AC or DC power.SOLUTION: A protective device 6 includes an input part 6a, a first output part 6b, a second output part 6c, and a shutdown part 6f. The input part 6a is connected to an AC feeder path L1 that feeds power from one of a number of external sources. The first output part 6b is connected to a DC feeder path L2. The second output part 6c is connected to an AC feeder path L3. The shutdown part 6f switches a DC connection path 6d between the input part 6a and the first output part 6b, and an AC connection path 6e between the input part 6a and the second output part 6c, between conduction and shutdown. The shutdown part 6f conducts the DC connection path 6d and shuts down the AC connection path 6e if the supplied power is DC power, and conducts the AC connection path 6e and shuts down the DC connection path 6d if the supplied power is AC power.SELECTED DRAWING: Figure 12

Description

Technical Field

[0001] The present disclosure relates to Electricity a power supply system to .

Background Art

[0002] In Patent Document 1, a lighting system that utilizes an existing commercial power line is disclosed by connecting a DC-driven LED lighting fixture to the existing commercial power line that constructs 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 constructs 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, in each individual guest room area of a hotel, a commercial power line that constructs a lighting power supply system (hereinafter abbreviated as a lighting system) and a power supply system for outlets (hereinafter abbreviated as an outlet system) are respectively laid. A plurality of lighting fixtures are connected to the commercial power line of the lighting system. A plurality of outlets are connected to the commercial power line of the outlet system. The commercial power line of the lighting system and the commercial power line of the outlet system are branched into two systems via a joint at the secondary side of an overcurrent breaker provided at the power receiving section of the commercial power (100V AC) provided for each guest room area, and are set.

[0004] Then, an AC-DC converter that converts 100V AC power into DC power of a predetermined voltage (e.g., 24V) is installed in the power receiving section of the commercial power line of 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 of the lighting system. In other words, the commercial power line of the lighting system is directly used as a DC power line, and the DC power converted by the AC-DC converter is supplied to this DC power line. A DC-driven LED lighting fixture is connected to the commercial power line of the lighting system that is supplied with DC power, and it is lit by the DC power. That is, the DC-driven LED lighting fixture is connected to the existing commercial power line and is lit using the existing commercial power line as a DC power line.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

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

[0007] However, in the above-described lighting system, in order to prevent AC power from being supplied to DC equipment, the DC power supply line and the AC power supply line are completely separated, and one power supply line does not serve as both a DC power supply line and an AC power supply line. That is, in the above-described lighting system, it was not possible to operate DC equipment using a power supply line (AC-DC power supply line) that selectively transmits either AC power or DC power.

[0008] Therefore, an object of the present disclosure is to enable both the operation and protection of DC equipment using an AC-DC power supply line that selectively transmits either AC power or DC power. electricityPower supply system to is to be provided.

Means for solving the problem

[0010] A power supply system according to an aspect of the present disclosure includes maintain a protection device, AC-DC a direct power supply circuit, AC-DC a current supply circuit, AC-DC a current supply circuit, switching device, and and is provided with. The AC-DC power supply circuit sends the supplied power from any one of a plurality of external power supplies including at least one AC power supply and at least one DC power supply. The DC power supply circuit supplies the supplied power to DC devices. The AC power supply circuit supplies the supplied power to AC devices. The switching device conducts or cuts off the AC-DC power supply circuit. The protection device includes an input section, a first output section, a second output section, and a cutoff section. The input section is connected to the AC-DC power supply circuit. The first output section is connected to the DC power supply circuit. The second output section is connected to the AC power supply circuit. The cutoff section switches the conduction and cutoff of the DC connection circuit between the input section and the first output section, and switches the conduction and cutoff of the AC connection circuit between the input section and the second output section. When the supplied power is DC power, the cutoff section conducts the DC connection circuit and cuts off the AC connection circuit. When the supplied power is AC power, the cutoff section conducts the AC connection circuit and cuts off the DC connection circuit.

Effect of the invention

[0012] As described above, in the present disclosure, there is an effect that the operation and protection of DC devices can be made compatible by using an AC / DC power supply circuit that selectively transmits either AC power or DC power.

Brief description of the drawings

[0013]

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[0014] The following embodiments generally relate to a protection device for DC devices, a power supply system, and lighting fixtures. More specifically, the present invention relates to a protection device for DC devices that protects DC devices, a power supply system, and lighting fixtures. Note that the following embodiments are merely examples of the embodiments of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to the design and the like as long as the effects of the present disclosure can be achieved.

[0015] The protection device for DC devices, the power supply system, and the lighting fixtures of the embodiments are mainly used in apartment houses, detached houses, office buildings, commercial buildings, hotels, factories, or stores. However, the protection device for DC devices, the power supply system, and the lighting fixtures of the embodiments may be used in other facilities other than those described above.

[0016] (Embodiment) Hereinafter, a protection device for DC devices, a power supply system, and lighting fixtures used in an apartment house will be described.

[0017] (1) Overview of the power supply system FIG. 1 shows the configuration of the power supply system 1 of this embodiment. The power supply system 1 includes a protection device 2 for DC devices, AC-DC power supply lines L0 and L1, and a DC power supply line L2. The power supply system 1 preferably further includes a protection device 3 for AC devices and an AC power supply line L3. Also, the power supply system 1 preferably further includes a distribution board 41, a sub-distribution board 42, a branching device 43, and a DC power supply unit 44. In the following description, the protection device 2 for DC devices may be referred to as the DC protection device 2, and the protection device 3 for AC devices may be referred to as the AC protection device 3.

[0018] The distribution board 41 and the DC power supply unit 44 are installed outside each household H1, H2,... in the building B1.

[0019] 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 the power (supply power) supplied from any one of the plurality of external power sources 9 to a plurality of sub-distribution boards 42 in the building B1 via the AC-DC power supply line L0. The plurality of external power sources 9 includes at least one AC power source and at least one DC power source. In the power supply system 1 of FIG. 1, as the two external power sources 9, an AC power source 91 and the DC power source 92 of the DC power supply unit 44 are used. The AC power source 91 is a commercial power system that uses AC power with an effective voltage value of 100V as the supply power. The DC power source 92 includes a rechargeable battery and uses DC power with a voltage of 100V as the supply power.

[0020] The DC power supply unit 44 includes a DC power source 92 and may further include an auxiliary power source 44a.

[0021] The DC power source 92 includes a storage battery 92a such as a lithium-ion battery, a nickel-metal hydride battery, or a lead-acid battery. The DC power source 92 has a power failure detection function for the AC power source 91, and when the AC power source 91 is energized, it charges the storage battery 92a using the AC power supplied from the AC power source 91. When the AC power source 91 fails, the DC power source 92 outputs the DC power of the storage battery 92a as the supply power to the distribution board 41.

[0022] The auxiliary power supply 44a converts the DC voltage of the storage battery 92a into a desired voltage to generate auxiliary power, and outputs the auxiliary power from an outlet. The auxiliary power is, for example, DC 5V, DC 1.5V, or AC 100V, and outlets such as a USB (Universal Serial Bus) socket, a DC socket, and an AC socket are used.

[0023] The switchboard 41 distributes the AC power supplied from the AC power supply 91 or the DC power supplied from the DC power supply 92 as supply power to a plurality of sub-switchboards 42 in the building B1 via the AC / DC supply circuit L0. When the AC power supply 91 is energized, AC power is supplied from the AC power supply 91 and no DC power is supplied from the DC power supply 92, so the supply power is AC power. When there is a power outage in the AC power supply 91, no AC power is supplied from the AC power supply 91 and DC power is supplied from the DC power supply 92, so the supply power is DC power.

[0024] Building B1 is equipped with a distribution board 42 for each of a plurality of households H1, H2, … within Building B1. The distribution board 42 includes a main breaker 42a and a plurality of branch breakers 42b. The supply power distributed from the power distribution board 41 to the distribution board 42 via the AC / DC power supply line L0 is sent to a plurality of AC / DC power supply lines L1 branched by the plurality of branch breakers 42b via the main breaker 42a. The main breaker 42a corresponds to a switch device for conducting or interrupting the AC / DC power supply line L0. Each of the plurality of branch breakers 42b corresponds to a switch device for conducting or interrupting the AC / DC power supply line L1. And when the supply power is AC power, the main breaker 42a preferably includes a tripping device that operates the opening / closing mechanism of the main breaker 42a to cut off the circuit when an overcurrent flows through the AC / DC power supply line L0. Also, when the supply power is AC power, the branch breaker 42b preferably includes a tripping device that operates the opening / closing mechanism of the branch breaker 42b to cut off the circuit when an overcurrent flows through the AC / DC power supply line L1. That is, when the supply power is AC power, it is preferable that the main breaker 42a and the branch breakers 42b cut off the AC / DC power supply lines L0 and L1 when an overcurrent flows through the AC / DC power supply lines L0 and L1. Therefore, the main breaker 42a and the branch breakers 42b can provide overcurrent protection for the AC / DC power supply lines L0 and L1 when the supply power is AC power.

[0025] The plurality of AC / DC power supply lines L1 are circuits for supplying supply power to each device within the household H1. Each device within the household H1 is each device such as a disaster prevention lighting fixture 81, a normal lighting fixture 82, an air conditioning device 83, and a power outlet 84. The disaster prevention lighting fixture 81 has a DC device that lights an emergency light source with DC power. The normal lighting fixture 82 has an AC device that lights a normal light source with AC power. The air conditioning device 83 has an AC device that adjusts the air conditioning environment within the household H1 with AC power. The power outlet 84 has an AC device that supplies AC power to a device plugged into the power outlet 84. Hereinafter, when distinguishing between the plurality of AC / DC power supply lines L1 from each other, they are referred to as AC / DC power supply lines L11, L12, L13, … Also, when distinguishing between the plurality of AC power supply lines L3, they are referred to as AC power supply lines L31, L32, L33, …

[0026] Among the plurality of AC / DC power supply lines L1, the AC / DC power supply line L11 is electrically connected to the DC power supply line L2 via the DC protection device 2 and is electrically connected to the AC power supply line L31 via the AC protection device 3. Among the plurality of 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. Among the plurality of 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.

[0027] Specifically, the AC / DC power supply line L11 is electrically connected to the disaster prevention lighting fixture 81 via the DC protection device 2 and the DC power supply line L2 and is electrically connected to the normal lighting fixture 82 via the AC protection device 3 and the AC power supply line L31. The AC / DC power supply line L12 is electrically connected to the air conditioner 83 via the AC protection device 3 and the AC power supply line L32. The AC / DC power supply line L13 is electrically connected to the power outlet 84 via the AC protection device 3 and the AC power supply line L33. It is preferable that a lighting switch 5 for switching on and off the normal lighting fixture 82 is provided in the AC power supply line L31 to which the normal lighting fixture 82 is electrically connected.

[0028] And the DC protection device 2 transmits only DC power from the AC / DC power supply line L1 to the DC power supply line L2, so as to supply only DC power to the DC devices such as the disaster prevention lighting fixture 81 and not to supply AC power to the DC devices. That is, the DC protection device 2 prevents AC power from being supplied to the DC devices and protects the DC devices.

[0029] Also, the AC protection device 3 transmits only AC power from the AC / DC power supply line L1 to the AC power supply line L3, so as to supply only AC power to the AC devices such as the normal lighting fixture 82, the air conditioner 83, and the power outlet 84 and not to supply DC power to the AC devices. That is, the AC protection device 3 prevents DC power from being supplied to the AC devices and protects the AC devices.

[0030] In the power supply system 1 of FIG. 1, a DC protection device 2 (AC cutoff section 2d) that supplies DC power to a disaster prevention lighting fixture 81 equipped with DC equipment and an AC protection device 3 (DC cutoff section 3d) that supplies AC power to a normal lighting fixture 82 equipped with AC equipment are connected to one AC / DC power supply line L11. That is, the power supply line for lighting is a shared line system in which the disaster prevention lighting fixture 81 and the normal lighting fixture 82 use the same AC / DC power supply line L11. Specifically, one AC / DC power supply line L11 branches into two systems. And 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 normal lighting fixture 82 via the AC protection device 3.

[0031] Also, a branching device 43 is provided in the AC / DC power supply line L11 before the branching. The branching device 43 branches an AC / DC power supply line L19 from the AC / DC power supply line L11.

[0032] Note that in FIG. 1, the power supply line including the above-mentioned AC / DC power supply line L1, DC power supply line L2, and AC power supply line L3 is represented by a single line, but the actual power supply line includes at least two electric wires, bus bars, or conductors.

[0033] (2) DC protection device FIG. 2 shows the block configuration of the DC protection device 2. The DC protection device 2 includes an input section 2a, an output section 2b, a DC connection circuit 2c, and an AC cutoff section 2d.

[0034] The input section 2a is electrically connected to the AC / DC power supply line L1 and receives supply power from the AC / DC power supply line L1. The input section 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.

[0035] The output section 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 section 2b has a conductor such as a terminal, solder, or a circuit pattern to which the DC power supply line L2 is electrically connected.

[0036] The DC connection circuit 2c is a circuit between the input part 2a and the output part 2b, and is composed of conductors such as electric wires, circuit patterns on a substrate, or bus bars.

[0037] The AC cutoff part 2d switches between conduction and cutoff of the DC connection circuit 2c. Specifically, the AC cutoff part 2d includes a contact 21 and a determination part 22.

[0038] The contact 21 is composed of at least a part of a mechanical relay or a semiconductor relay, and is connected in series to the DC connection circuit 2c. When the contact 21 is on, the DC connection circuit 2c conducts, and when the contact 21 is off, the DC connection circuit 2c is cut off. That is, when the contact 21 is on, the AC / DC power supply circuit L1 and the DC power supply circuit L2 are connected, and when the contact 21 is off, the AC / DC power supply circuit L1 and the DC power supply circuit L2 are cut off.

[0039] The determination part 22 monitors the voltage of the AC / DC power supply circuit L1 and determines whether the supplied power of the AC / DC power supply circuit L1 is AC power or DC power. Based on the determination result, if the supplied power is DC power, the determination part 22 turns on the contact 21, and if the supplied power is AC power, the determination part 22 turns off the contact 21. The determination part 22 may be configured by discrete components such as resistors, capacitors, and transistors, or may be configured to include a computer that realizes at least a part of the function of the determination part 22 by executing software.

[0040] Figure 3 shows an example of the circuit configuration of the DC protection device 2.

[0041] The input part 2a is composed of a pair of input terminals 201 and 202. The output part 2b is composed of a pair of output terminals 203 and 204. The AC / DC power supply circuit L1 has a pair of circuits L1a and L1b, the input terminal 201 is connected to the circuit L1a, and the input terminal 202 is connected to the circuit L1b. The DC power supply circuit L2 has a pair of circuits L2a and L2b, the output terminal 203 is connected to the circuit L2a, and the output terminal 204 is connected to the circuit L2b.

[0042] The determination unit 22 includes resistors R1 to R3, capacitors C1 and C2, a triac Q1, a relay K1, and a drive coil K21 of the relay K2. A series circuit of the capacitor C1, the resistors R1 and R2 is connected between a pair of input terminals 201 and 202 in the order of the capacitor C1, the resistor R1, and the resistor R2 from the circuit L1a toward the circuit L1b. A drive coil K11 of the relay K1 and a series circuit of the triac Q1 are connected in parallel to the series circuit of the capacitor C1, the resistors R1 and R2. The gate of the triac Q1 is connected to the connection point of the resistors R1 and R2 via the resistor R3. A capacitor C2 is connected in parallel to the resistor R2. A series circuit of a contact K12 of the relay K1 and the drive coil K21 of the relay K2 is connected between the pair of input terminals 201 and 202.

[0043] The contact 21 is composed of a contact K22 of the relay K2. The contact K22 is a normally closed b contact. If no coil current flows through the drive coil K21, the contact K22 closes and the contact 21 turns on. When coil current flows through the drive coil K21, the contact K22 opens and the contact 21 turns off.

[0044] 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 circuit between the input terminal 201 and the output terminal 203 and the circuit between the input terminal 202 and the output terminal 204 constitute a DC connection circuit 2c.

[0045] When DC power is sent as supply power to the AC-DC power supply line L1, the input voltage V1 between the pair of lines L1a and L1b becomes a DC voltage. At this time, although a DC voltage is applied to the series circuit of the capacitor C1, resistors R1, and R2, since the capacitor C1 functions as a DC cut capacitor, no gate current flows through the gate of the triac Q1, and the triac Q1 turns off. When the triac Q1 turns off, no coil current flows through the drive coil K11, and the contact K12 turns off. When the contact K12 turns off, no coil current flows through the drive coil K21, and the contact K22 becomes closed. Therefore, when DC power is sent as supply power to the AC-DC power supply line L1, the contact 21 turns on, and the DC connection line 2c conducts.

[0046] Also, when AC power is sent as supply power to the AC-DC power supply line L1, the input voltage V1 between the pair of lines L1a and L1b becomes an AC voltage. At this time, an AC voltage is applied to the series circuit of the capacitor C1, resistors R1, and R2, a gate current flows through the gate of the triac Q1, and the triac Q1 turns on. When the triac Q1 turns on, a coil current flows through the drive coil K11, and the contact K12 turns on. When the contact K12 turns on, a coil current flows through the drive coil K21, and the contact K22 becomes open. Therefore, when AC power is sent as supply power to the AC-DC power supply line L1, the contact 21 turns off, and the DC connection line 2c is cut off.

[0047] In the above-described DC protection device 2, the AC-DC power supply line L1 is connected to the input section 2a, and the DC power supply line L2 is connected to the output section 2b. And when the supply power of the AC-DC power supply line L1 is DC power, the DC protection device 2 conducts between the AC-DC power supply line L1 and the DC power supply line L2 and transmits the DC power to the DC power supply line L2. The disaster prevention lighting fixture 81 receives DC power from the DC power supply line L2 and lights up. That is, the disaster prevention lighting fixture 81 lights up with DC power when there is a power outage in the AC power supply 91.

[0048] Further, if the power supplied by the AC-DC power supply line L1 is AC power, the DC protection device 2 cuts off between the AC-DC power supply line L1 and the DC power supply line L2 and does not transmit AC power to the DC power supply line L2. Since the disaster prevention lighting fixture 81 is not supplied with AC power from the DC power supply line L2, the DC devices of the disaster prevention lighting fixture 81 are protected. At this time, the disaster prevention lighting fixture 81 is turned off.

[0049] Therefore, the DC protection device 2 can achieve both the operation and protection of the DC devices of the disaster prevention lighting fixture 81 by using the AC-DC power supply lines L0 and L1 that selectively transmit either AC power or DC power.

[0050] Further, 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 perform overcurrent protection of the DC power supply line L2 when the supplied power is DC power.

[0051] (3) AC protection device FIG. 4 shows the 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 cutoff unit 3d.

[0052] The input unit 3a is electrically connected to the AC-DC power supply line L1 and receives supplied power from the AC-DC power supply line L1. The input unit 3a has conductors such as terminals, solders, or circuit patterns on the substrate to which the AC-DC power supply line L1 is electrically connected.

[0053] The output unit 3b is electrically connected to the AC power supply line L3 and outputs supplied power (AC power) to the AC power supply line L3. The output unit 3b has conductors such as terminals, solders, or circuit patterns to which the AC power supply line L3 is electrically connected.

[0054] The AC connection circuit 3c is a circuit between the input section 3a and the output section 3b, and is composed of conductors such as electric wires, circuit patterns on a substrate, or bus bars.

[0055] The DC cutoff section 3d switches between conduction and cutoff of the AC connection circuit 3c. Specifically, the DC cutoff section 3d includes a contact 31 and a determination section 32.

[0056] The contact 31 is composed of at least a part of a mechanical relay or a semiconductor relay, and is connected in series to the AC connection circuit 3c. When the contact 31 is on, the AC connection circuit 3c is conductive, and when the contact 31 is off, the AC connection circuit 3c is cut off. That is, when the contact 31 is on, the AC / DC power supply circuit L1 and the AC power supply circuit L3 are conductive, and when the contact 31 is off, the AC / DC power supply circuit L1 and the AC power supply circuit L3 are cut off.

[0057] The determination section 32 monitors the voltage of the AC / DC power supply circuit L1 and determines whether the supplied power of the AC / DC power supply circuit L1 is AC power or DC power. Based on the determination result, if the supplied power is AC power, the determination section 32 turns on the contact 31, and if the supplied power is DC power, the determination section 32 turns off the contact 31. The determination section 32 may be configured by discrete components such as resistors, capacitors, and transistors, or may be configured to include a computer that realizes at least a part of the function of the determination section 32 by executing software.

[0058] FIG. 4 shows an example of the circuit configuration of the AC protection device 3.

[0059] The input section 3a is composed of a pair of input terminals 301 and 302. The output section 3b is composed of a pair of output terminals 303 and 304. The AC / DC power supply circuit L1 has a pair of circuits L1a and L1b, the input terminal 301 is connected to the circuit L1a, and the input terminal 302 is connected to the circuit L1b. The AC power supply circuit L3 has a pair of circuits L3a and L3b, the output terminal 303 is connected to the circuit L3a, and the output terminal 304 is connected to the circuit L3b.

[0060] The determination unit 32 includes resistors R11 to R13, capacitors C11 and C12, a triac Q2, a relay K3, and the drive coil K41 of the relay K4. The series circuit of the capacitor C11, the resistors R11 and R12 is connected between a pair of input terminals 301 and 302 in the order of the capacitor C11, the resistor R11, and the resistor R12 from the circuit L1a toward the circuit L1b. A series circuit of the drive coil K31 of the relay K3 and the triac Q2 is connected in parallel to the series circuit of the capacitor C11, the resistors R11 and R12. The gate of the triac Q2 is connected to the connection point of the resistors R11 and R12 via the resistor R13. A capacitor C12 is connected in parallel to the resistor R12. A series circuit of the contact K32 of the relay K3 and the drive coil K41 of the relay K4 is connected between the pair of input terminals 301 and 302.

[0061] The contact 31 is composed of the contact K42 of the relay K4. The contact K42 is a normally open a-contact. If 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.

[0062] 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 circuit between the input terminal 301 and the output terminal 303 and the circuit between the input terminal 302 and the output terminal 304 constitute the AC connection circuit 3c.

[0063] When AC power is sent as supply power to the AC-DC power supply line L1, the input voltage V1 between the pair of lines L1a and L1b becomes an AC voltage. At this time, an AC voltage is applied to the series circuit of the capacitor C11, resistors R11, and R12, a gate current flows through the gate of the triac Q2, and the triac Q2 turns on. When the triac Q2 turns on, a coil current flows through the drive coil K31, and the contact K32 turns on. When the contact K32 turns on, a coil current flows through the drive coil K41, and the contact K42 becomes closed. Therefore, when AC power is sent as supply power to the AC-DC power supply line L1, the contact 31 turns on, and the AC connection line 3c becomes conductive.

[0064] Also, when DC power is sent as supply power to the AC-DC power supply line L1, the input voltage V1 between the pair of lines L1a and L1b becomes a DC voltage. At this time, a DC voltage is applied to the series circuit of the capacitor C11, resistors R11, and R12. However, since the capacitor C11 functions as a DC cut capacitor, no gate current flows through the gate of the triac Q2, and the triac Q2 turns off. When the triac Q2 turns off, no coil current flows through the drive coil K31, and the contact K32 turns off. When the contact K32 turns off, no coil current flows through the drive coil K41, and the contact K42 becomes closed. Therefore, when DC power is sent as supply power to the AC-DC power supply line L1, the contact 31 turns off, and the AC connection line 3c is cut off.

[0065] In the above AC protection device 3, the AC-DC power supply line L1 is connected to the input section 3a, and the AC power supply line L3 is connected to the output section 3b. Then, if the supply power of the AC-DC power supply line L1 is AC power, the AC protection device 3 conducts between the AC-DC power supply line L1 and the AC power supply line L3 and transmits the AC power to the AC power supply line L3. The general 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 supply 91 is energized, the general lighting fixture 82 lights up by AC power when the lighting switch 5 is on and goes out when the lighting switch 5 is off. When the AC power supply 91 is energized, the air conditioner 83 operates by AC power, and the outlet 84 supplies AC power to the device plugged into the outlet 84.

[0066] Further, if the power supplied by the AC-DC power supply line L1 is DC power, the AC protection device 3 cuts off the connection between the AC-DC power supply line L1 and the AC power supply line L3 and does not transmit DC power to the AC power supply line L3. Since the normal lighting fixture 82, the air conditioner 83, and the outlet 84 are not supplied with DC power from the AC power supply line L3, the AC devices of the normal lighting fixture 82, the air conditioner 83, and the outlet 84 are protected. At this time, the normal lighting fixture 82 is turned off, the air conditioner 83 stops, and the outlet 84 does not supply power.

[0067] Therefore, the AC protection device 3 can achieve both the operation and protection of the AC devices of the normal lighting fixture 82, the air conditioner 83, and the outlet 84 by using the AC-DC power supply lines L0 and L1 that selectively send either AC power or DC power.

[0068] (4) Operation of the power supply system The power supply system 1 including the above-described DC protection device 2 and AC protection device 3 operates as follows.

[0069] When the AC power supply 91 is energized, the distribution board 41 sends the AC power of the AC power supply 91 to the AC-DC power supply line L0. The sub-distribution board 42 branches the AC power of the AC-DC power supply line L0 to a plurality of AC-DC power supply lines L1 via a plurality of branch breakers 42b. Then, as shown in FIG. 1, the AC cutoff section 2d of the DC protection device 2 is turned off, and the DC cutoff section 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 normal lighting fixture 82 connected to the AC protection device 3 lights up or turns off according to the on / off state of the lighting switch 5. Further, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 can execute the functions of their respective AC devices.

[0070] When there is a power outage in the AC power supply 91, the distribution board 41 sends the DC power of the DC power supply 92 to the AC / DC power supply line L0. The sub-distribution board 42 branches the DC power of the AC / DC power supply line L0 to a plurality of AC / DC power supply lines L1 via a plurality of branch breakers 42b. Then, as shown in FIG. 6, the AC cutoff section 2d of the DC protection device 2 is turned on, and the DC cutoff section 3d of the AC protection device 3 is turned off. Therefore, when there is a power outage in the AC power supply 91, the disaster prevention lighting fixture 81 connected to the DC protection device 2 lights up, and the normal lighting fixture 82 connected to the AC protection device 3 goes out. Also, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 become unable to execute the functions of their respective AC devices.

[0071] FIG. 7A shows the block configuration of the disaster prevention lighting fixture 81. The disaster prevention lighting fixture 81 houses a DC device 81a in the fixture main body 8A, and the DC device 81a includes an emergency lighting circuit 811 and an emergency light source 812.

[0072] The emergency light source 812 includes at least one solid-state light-emitting element. For example, the emergency light source 812 has an LED array in which a plurality of LEDs (Light Emitting Diodes) are connected in series as a plurality of solid-state light-emitting elements. Note that the emergency light source 812 is not limited to a configuration having an LED as the solid-state light-emitting element. The emergency light source 812 may have other solid-state light-emitting elements such as an organic EL (Organic Electro Luminescence, OEL) or a semiconductor laser diode (Laser Diode, LD), for example.

[0073] The emergency lighting circuit 811 is a switching power supply circuit. The configuration of the switching power supply circuit is, for example, an isolated flyback converter, etc., but is not limited to a specific configuration. When the emergency lighting circuit 811 receives DC power from the DC power supply line L2, it converts the DC power into DC load power, supplies a DC load current to the emergency light source 812, and lights up the emergency light source 812. That is, the emergency lighting circuit 811 converts DC power into load power, and the emergency light source 812 is lit by the load power.

[0074] FIG. 7B shows the block configuration of the normal lighting fixture 82. The normal lighting fixture 82 houses an AC device 82a in the fixture main body 8B, and the AC device 82a includes a normal lighting circuit 821 and a normal light source 822.

[0075] The normal light source 822 includes at least one solid-state light-emitting element. For example, the normal light source 822 has an LED array in which a plurality of LEDs are connected in series as a plurality of solid-state light-emitting elements. Note that the normal light source 822 is not limited to a configuration having an LED as the solid-state light-emitting element. The normal light source 822 may have other solid-state light-emitting elements such as an organic EL or a semiconductor laser diode, for example.

[0076] The normal lighting circuit 821 is a switching power supply circuit. The configuration of the switching power supply circuit is composed of, for example, an isolated flyback converter, but is not limited to a specific configuration. When the normal lighting circuit 821 receives AC power from the AC power supply line L3, it converts the AC power into DC load power, supplies a DC load current to the normal light source 822, and lights the normal light source 822. That is, the normal lighting circuit 821 converts AC power into load power, and the normal light source 822 is lit by the load power.

[0077] As shown in FIG. 8, the power supply system 1 may use a lighting fixture 80 that integrates the disaster prevention lighting fixture 81 (FIG. 7A) and the normal lighting fixture 82 (FIG. 7B). The lighting fixture 80 houses the above-described DC device 81a and AC device 82a in the fixture main body 8C. That is, the lighting fixture 80 serves as both the disaster prevention lighting fixture 81 and the normal lighting fixture 82.

[0078] The above-mentioned disaster prevention lighting fixture 81 and lighting fixture 80 are power supply separate type disaster prevention lighting fixtures that receive power supply from a DC power supply 92 configured separately from the fixture main body and cause the emergency light source 812 to light up in an emergency. The power supply system 1 can use AC / DC power supply lines L0 and L1 that selectively send either AC power or DC power by combining the above-mentioned DC protection device 2 with such a power supply separate type disaster prevention lighting fixture. Therefore, the power supply system 1 can use a power supply separate type disaster prevention lighting fixture while suppressing the laying length of the DC power supply line L2 that sends only DC power. In addition, the power supply system 1 can easily inspect the storage battery 92a of the DC power supply 92 by using a power supply separate type disaster prevention lighting fixture.

[0079] (5) First Modified Example FIG. 9 shows the configuration of a power supply system 1A as a modified example of the power supply system 1.

[0080] In the power supply system 1A, an AC cutoff section 2d (DC protection device 2) that supplies DC power to the disaster prevention lighting fixture 81 equipped with DC equipment and a DC cutoff section 3d (AC protection device 3) that supplies AC power to the normal lighting fixture 82 equipped with AC equipment are respectively connected to different AC / DC power supply lines L101 and L102 among two or more AC / DC power supply lines L1. That is, the power supply lines for lighting adopt a dedicated line method in which the AC / DC power supply line L101 used by the disaster prevention lighting fixture 81 is different from the AC / DC power supply line L102 used by the normal lighting fixture 82.

[0081] Specifically, the supplied power distributed from the distribution board 41 to the sub-distribution board 42 via the AC / DC power supply line L0 is sent to a plurality of AC / DC power supply lines L1 branched by a plurality of branch breakers 42b via the main breaker 42a. Hereinafter, when distinguishing between a plurality of AC / DC power supply lines L1, they are referred to as AC / DC power supply lines L101, L102, L103,...... In addition, when distinguishing between a plurality of AC power supply lines L3, they are referred to as AC power supply lines L301, L302, L303,......

[0082] Among the plurality of AC / DC power supply circuits L1, the AC / DC power supply circuit L101 is electrically connected to the DC power supply circuit L2 via the DC protection device 2. Among the plurality of AC / DC power supply circuits L1, the AC / DC power supply circuit L102 is electrically connected to the AC power supply circuit L301 via the AC protection device 3. Among the plurality of AC / DC power supply circuits L1, the AC / DC power supply circuit L103 is electrically connected to the AC power supply circuit L302 via the AC protection device 3. Among the plurality of AC / DC power supply circuits L1, the AC / DC power supply circuit L104 is electrically connected to the AC power supply circuit L303 via the AC protection device 3.

[0083] The AC / DC power supply circuit L101 is electrically connected to the disaster prevention lighting fixture 81 via the DC protection device 2 and the DC power supply circuit L2. The AC / DC power supply circuit L102 is electrically connected to the normal lighting fixture 82 via the AC protection device 3 and the AC power supply circuit L301. The AC / DC power supply circuit L103 is electrically connected to the power outlet 84 via the AC protection device 3 and the AC power supply circuit L302. The AC / DC power supply circuit L104 is electrically connected to the air conditioner 83 via the AC protection device 3 and the AC power supply circuit L303. It is preferable that a lighting switch 5 for switching on and off the normal lighting fixture 82 is provided in the AC power supply circuit L301 to which the normal lighting fixture 82 is electrically connected.

[0084] When the AC power supply 91 is energized, the distribution board 41 sends the AC power of the AC power supply 91 to the AC / DC power supply circuit L0. The sub-distribution board 42 branches the AC power of the AC / DC power supply circuit L0 to a plurality of AC / DC power supply circuits L1 via a plurality of branch breakers 42b. Then, the AC cutoff section 2d of the DC protection device 2 is turned off, and the DC cutoff section 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 normal lighting fixture 82 connected to the AC protection device 3 is turned on or off according to the on / off state of the lighting switch 5. Also, the air conditioner 83 and the power outlet 84 connected to the AC protection device 3 can execute the functions of their respective AC devices.

[0085] When there is a power outage in the AC power supply 91, the distribution board 41 sends the DC power of the DC power supply 92 to the AC-DC power supply line L0. The sub-distribution board 42 branches the DC power of the AC-DC power supply line L0 to a plurality of AC-DC power supply lines L1 via a plurality of branch breakers 42b. Then, as shown in FIG. 9, the AC cutoff section 2d of the DC protection device 2 is turned on, and the DC cutoff section 3d of the AC protection device 3 is turned off. Therefore, when there is a power outage in the AC power supply 91, the disaster prevention lighting fixture 81 connected to the DC protection device 2 lights up, and the normal lighting fixture 82 connected to the AC protection device 3 goes out. Also, the air conditioner 83 and the outlet 84 connected to the AC protection device 3 become unable to execute the functions of their respective AC devices.

[0086] (6) Second Modified Example Each of FIGS. 10A, 10B, 11A, and 11B shows a modified example of a lighting fixture.

[0087] The disaster prevention lighting fixture 81A in FIG. 10A includes, in addition to the DC device 81a, the DC protection device 2 and the DC power supply line L2, and houses the DC device 81a, the DC protection device 2, and the DC power supply line L2 in the fixture body 8D. That is, the disaster prevention lighting fixture 81A integrally includes the DC device 81a, the DC protection device 2, and the DC power supply line L2.

[0088] The normal lighting fixture 82A in FIG. 10B includes, in addition to the AC device 82a, the AC protection device 3 and the AC power supply line L3, and houses the AC device 82a, the AC protection device 3, and the AC power supply line L3 in the fixture body 8E. That is, the normal lighting fixture 82A integrally includes the AC device 82a, the AC protection device 3, and the AC power supply line L3.

[0089] As shown in Fig. 11A, the power supply system 1 may use a lighting fixture 80A that integrates the disaster prevention lighting fixture 81A (see Fig. 10A) and the normal lighting fixture 82A (see Fig. 10B). The lighting fixture 80A includes a fixture body 8F into which two systems of AC / DC power supply lines L1 are drawn, and the above-mentioned 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 are housed in the fixture body 8F. That is, the lighting fixture 80A uses two systems of AC / DC power supply lines L1 to serve as both the disaster prevention lighting fixture 81A and the normal lighting fixture 82A.

[0090] The lighting fixture 80B in Fig. 11B includes a fixture body 8G into which one system of AC / DC power supply line L1 is drawn, and the above-mentioned 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 are housed in the fixture body 8G. That is, the lighting fixture 80B uses one system of AC / DC power supply line L1 to serve as both the disaster prevention lighting fixture 81A and the normal lighting fixture 82A.

[0091] (7) Third modification example The lighting fixture 80C in Fig. 12A includes one protection device 6 having the functions of the DC protection device 2 and the AC protection device 3 instead of the DC protection device 2 and the AC protection device 3 of the lighting fixture 80B (see Fig. 11B).

[0092] Fig. 12B shows the configuration of the protection device 6. The protection device 6 includes an input section 6a, output sections 6b, 6c, a DC connection circuit 6d, an AC connection circuit 6e, and a cutoff section 6f.

[0093] The input section 6a is electrically connected to the AC / DC power supply line L1 and receives supply power from the AC / DC power supply line L1. The input section 6a 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.

[0094] The output section 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 section 6b has a conductor such as a terminal, solder, or a circuit pattern to which the DC power supply line L2 is electrically connected.

[0095] The output unit 6c has the AC power supply line L3 electrically connected thereto and outputs supplied power (AC power) to the AC power supply line L3. The output unit 6c has conductors such as terminals, solders, or circuit patterns to which the AC power supply line L3 is electrically connected.

[0096] The DC connection circuit 6d is a circuit between the input unit 6a and the output unit 6b and is composed of conductors such as electric wires, circuit patterns on a substrate, or bus bars.

[0097] The AC connection circuit 6e is a circuit between the input unit 6a and the output unit 6c and is composed of conductors such as electric wires, circuit patterns on a substrate, or bus bars.

[0098] The cutoff unit 6f has the functions of both the AC cutoff unit 2d (see FIG. 2) and the DC cutoff unit 3d (see FIG. 4). The cutoff unit 6f switches between conduction and cutoff of the DC connection circuit 6d and switches between conduction and cutoff of the AC connection circuit 6e. Specifically, the cutoff unit 6f includes contacts 61, 62, and a determination unit 63.

[0099] The contact 61 is composed of at least a part of a mechanical relay or a semiconductor relay and is connected in series to the DC connection circuit 6d. When the contact 61 is on, the DC connection circuit 6d conducts, and when the contact 61 is off, the DC connection circuit 6d is cut off. That is, when the contact 61 is on, the AC / DC power supply line L1 and the DC power supply line L2 are conducted, and when the contact 61 is off, the AC / DC power supply line L1 and the DC power supply line L2 are cut off.

[0100] The contact 62 is composed of at least a part of a mechanical relay or a semiconductor relay and is connected in series to the AC connection circuit 6e. When the contact 62 is on, the AC connection circuit 6e conducts, and when the contact 62 is off, the AC connection circuit 6e is cut off. That is, when the contact 62 is on, the AC / DC power supply line L1 and the AC power supply line L3 are conducted, and when the contact 62 is off, the AC / DC power supply line L1 and the AC power supply line L3 are cut off.

[0101] The determination unit 63 monitors the voltage of the AC / DC power supply line L1 and determines whether the supplied power of 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 the contact 61 and turns off the contact 62. If the supplied power is AC power, the determination unit 63 turns off the contact 61 and turns on the contact 62. The determination unit 63 may be configured by discrete components such as resistors, capacitors, and transistors, or may be configured to include a computer that realizes at least a part of the functions of the determination unit 63 by executing software.

[0102] FIG. 13 shows an example of the circuit configuration of the protection device 6.

[0103] 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 power lines L1a and L1b, the input terminal 601 is connected to the power line L1a, and the input terminal 602 is connected to the power line L1b. The DC power supply line L2 has a pair of power lines L2a and L0a, the output terminal 603 is connected to the power line L2a, and the output terminal 605 is connected to the power line L0a. The AC power supply line L3 has a pair of power lines L3a and L0a, the output terminal 604 is connected to the power line L3a, and the output terminal 605 is connected to the power line L0a.

[0104] The determination unit 63 includes resistors R21 to R23, capacitors C21 and C22, a triac Q3, relay coils K61 of relays K5 and K6, and a relay coil K71 of relay K7. A series circuit of capacitors C21, resistors R21 and R22 is connected between the pair of input terminals 601 and 602 in the order of capacitor C21, resistor R21, and resistor R22 from the power line L1a to the power line L1b. A series circuit of the relay coil K51 of relay K5 and the triac Q3 is connected in parallel to the series circuit of capacitors C21, resistors R21 and R22. The gate of the triac Q3 is connected to the connection point of resistors R21 and R22 via resistor R23. A capacitor C22 is connected in parallel to resistor R22.

[0105] 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, if no coil current flows through the drive coil K51 of the relay K5, the connection between the movable terminal T1 and the normally open terminal T2 is interrupted, and the connection between the movable terminal T1 and the normally closed terminal T3 is conductive. If coil current flows through the drive coil K51 of the relay K5, the connection between the movable terminal T1 and the normally open terminal T2 is conductive, and the connection between the movable terminal T1 and the normally closed terminal T3 is interrupted.

[0106] The normally closed terminal T3 of the contact K52 is electrically connected to the input terminal 601 via the drive coil K61 of the relay K6. The normally open terminal T2 of the contact K52 is electrically connected to the input terminal 601 via the drive coil K71 of the relay K7. The movable terminal T1 of the contact K52 is electrically connected to the input terminal 602.

[0107] The contact 61 is composed of the contact K62 of the relay K6. The contact K62 is a normally open a contact. If no coil current flows through the drive coil K61, the contact K62 is open and the contact 61 is off. When coil current flows through the drive coil K61, the contact K62 closes and the contact 61 turns on.

[0108] The contact 62 is composed of the contact K72 of the relay K7. The contact K72 is a normally open a contact. If no coil current flows through the drive coil K71, the contact K72 is open and the contact 62 is off. When coil current flows through the drive coil K71, the contact K72 closes and the contact 62 turns on.

[0109] 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 circuits between the input terminal 601 and the output terminal 603, and between the input terminal 602 and the output terminal 605 constitute the DC connection circuit 6d. The electric circuits between the input terminal 601 and the output terminal 604, and between the input terminal 602 and the output terminal 605 constitute the AC connection circuit 6e.

[0110] When DC power is sent as supply power to the 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 of the capacitor C21, resistors R21, and R22. However, since the capacitor C21 functions as a DC cut capacitor, no gate current flows to the gate of the triac Q3, and the triac Q3 turns off. When the triac Q3 turns off, no coil current flows through the drive coil K51, the connection between the movable terminal T1 and the normally open terminal T2 is interrupted, and the connection between the movable terminal T1 and the normally closed terminal T3 becomes conductive. As a result, a coil current flows through the drive coil K61, and the contact K62 closes. Also, no coil current flows through the drive coil K71, and the contact K72 opens. Therefore, when DC power is sent as supply power to the AC / DC power supply circuit L1, the contact 61 turns on, the DC connection circuit 6d conducts, the contact 62 turns off, and the AC connection circuit 6e is interrupted.

[0111] Also, when AC power is sent as supply power to the AC / DC power supply circuit L1, 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 the capacitor C21, resistors R21, and R22, a gate current flows through the gate of the triac Q3, and the triac Q3 turns on. When the triac Q3 turns on, a coil current flows through the drive coil K51, 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. As a result, a coil current flows through the drive coil K71, and the contact K72 becomes closed. Also, no coil current flows through the drive coil K61, and the contact K62 becomes open. Therefore, when AC power is sent as supply power to the AC / DC power supply circuit L1, the contact 62 turns on, the AC connection circuit 6e is connected, the contact 61 turns off, and the DC connection circuit 6d is disconnected.

[0112] When the supply power of the above-described protection device 6 is DC power, the protection device 6 connects the AC / DC power supply circuit L1 and the DC power supply circuit L2 and disconnects the AC / DC power supply circuit L1 and the AC power supply circuit L3 to transmit DC power to the DC power supply circuit L2. Also, when the supply power of the protection device 6 is AC power, the protection device 6 connects the AC / DC power supply circuit L1 and the AC power supply circuit L3 and disconnects the AC / DC power supply circuit L1 and the DC power supply circuit L2 to transmit AC power to the AC power supply circuit L3.

[0113] Therefore, the protection device 6 can achieve both the operation and protection of the DC device by using the AC / DC power supply circuits L0 and L1 that selectively send either AC power or DC power.

[0114] (8) Fourth modification The lighting fixture 80 in FIG. 8, the lighting fixture 80A in FIG. 11A, the lighting fixture 80B in FIG. 11B, and the lighting fixture 80C in FIG. 12A may be provided with a combined light source 800 shown in FIG. 14 instead of the emergency light source 812 and the normal light source 822. The combined light source 800 includes at least one solid-state light-emitting element. If the supplied power is DC power, the combined light source 800 is lit by the emergency lighting circuit 811, and if the supplied power is AC power, the combined light source 800 is lit by the normal lighting circuit 821. It is preferable to make the light output of the combined light source 800 by the emergency lighting circuit 811 different from the light output of the combined light source 800 by the normal lighting circuit 821.

[0115] The lighting fixture in 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 incorporates the above-mentioned DC protection device 2 and AC protection device 3, and makes the combined light source 800 emit light emergently if the supplied power is DC power, and makes the combined light source 800 emit light normally if the supplied power is AC power. It is preferable to make the light output of the combined light source 800 during emergency lighting different from the light output of the combined light source 800 during normal lighting.

[0116] (9) Fifth modification At least one of the DC protection device 2 and the AC protection device 3 may be incorporated in the branch breaker 42b.

[0117] Also, at least one of the normal lighting fixture 82, the air conditioner 83, and the outlet 84 may incorporate the AC protection device 3.

[0118] Also, the switchboard 41 and the DC power supply unit 44 may be installed on the rooftop or in the electrical room of the building B1.

[0119] (10) Summary As described above, the protection device (2) for a DC device according to the first aspect of the embodiment includes an input unit (2a), an output unit (2b), and an AC cutoff unit (2d). The input unit (2a) is connected to an AC / DC power supply line (L1) that transmits supply power from any one of a plurality of external power supplies (9) including at least one AC power supply (91) and at least one DC power supply (92). The output unit (2b) is connected to a DC power supply line (L2) that supplies supply power to the DC device (81a). The AC cutoff unit (2d) switches between conduction and interruption of a DC connection line (2c) between the input unit (2a) and the output unit (2b). The AC cutoff unit (2d) conducts the DC connection line (2c) if the supply power is DC power, and interrupts the DC connection line (2c) if the supply power is AC power.

[0120] The above-described protection device (2) for a DC device can achieve both the operation and protection of the DC device (81a) included in the disaster prevention lighting fixture (81) by using the AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

[0121] In the protection device (2) for a DC device according to the second aspect of the embodiment, in the first aspect, the AC cutoff unit (2d) preferably includes a determination unit (22) that determines whether the supply power is DC power or AC power, and a contact (21) provided in series with the DC connection line (2c). The contact (21) turns on if the supply power is DC power and turns off if the supply power is AC power based on the determination result of the determination unit (22).

[0122] The above-described protection device (2) for a DC device can achieve both the operation and protection of the DC device (81a) included in the disaster prevention lighting fixture (81) by using the AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

[0123] The power supply system (1) according to the third aspect of the embodiment includes the protection device (2) for a DC device according to the first or second aspect, an AC / DC power supply line (L1), and a DC power supply line (L2).

[0124] The above power supply system (1) can achieve both the operation and protection of the DC equipment (81a) of the disaster prevention lighting fixture (81) by using the AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

[0125] In the power supply system (1) according to the fourth aspect of the embodiment, in the third aspect, when the supplied power is DC power, it is preferable that the protection device (2) of the DC equipment shuts off the DC connection circuit (2c) when an overcurrent flows through the DC power supply line (L2).

[0126] The above power supply system (1) can perform overcurrent protection of the DC power supply line (L2) when the supplied power is DC power.

[0127] The power supply system (1) according to the fifth aspect of the embodiment preferably further includes switch devices (42a, 42b) for conducting or interrupting the AC / DC power supply lines (L0, L1) in the third or fourth aspect.

[0128] The above power supply system (1) can easily switch the power supply to the devices within the system.

[0129] In the power supply system (1) according to the sixth aspect of the embodiment, in the fifth aspect, when the supplied power is AC power, it is preferable that the switch devices (42a, 42b) shut off the AC / DC power supply lines (L0, L1) when an overcurrent flows through the AC / DC power supply lines (L0, L1).

[0130] The above power supply system (1) can perform overcurrent protection of the AC / DC power supply lines (L0, L1) when the supplied power is AC power.

[0131] In the power supply system (1) according to the seventh aspect of the embodiment, in any one of the third to sixth aspects, it is preferable to further include a DC cutoff unit (3d) that switches between conduction and interruption of an AC connection circuit (3c) between an AC power supply circuit (L3) that supplies power to an AC device (82a) and a DC-AC power supply circuit (L1). The DC cutoff unit (3d) conducts the AC connection circuit (3c) if the supplied power is AC power, and cuts off the AC connection circuit (3c) if the supplied power is DC power.

[0132] The above power supply system (1) can achieve both the operation and protection of the AC device (82a) by using a DC-AC power supply circuit (L1) that selectively transmits either AC power or DC power.

[0133] In the power supply system (1) according to the eighth aspect of the embodiment, in the seventh aspect, an AC cutoff unit (2d) that supplies DC power to a disaster prevention lighting fixture (81) including a DC device (81a) and a DC cutoff unit (3d) that supplies AC power to a normal lighting fixture (82) including an AC device (82a) are preferably connected to one DC-AC power supply circuit (L11).

[0134] The above power supply system (1) can adopt a shared line method in which the power supply circuit for lighting uses the same DC-AC power supply circuit (L11) for the disaster prevention lighting fixture (81) and the normal lighting fixture (82).

[0135] In the power supply system (1) according to the ninth aspect of the embodiment, in the seventh aspect, the number of DC-AC power supply circuits (L1) is two or more. An AC cutoff unit (2d) that supplies DC power to a disaster prevention lighting fixture (81) including a DC device (81a) and a DC cutoff unit (3d) that supplies AC power to a normal lighting fixture (82) including an AC device (82a) are respectively connected to different DC-AC power supply circuits (L101, L102) among the two or more DC-AC power supply circuits (L1). The above power supply system (1) can adopt a shared line method in which the power supply circuit for lighting uses the same DC-AC power supply circuit (L11) for the disaster prevention lighting fixture (81) and the normal lighting fixture (82).

[0136] The lighting fixtures (81A, 80A to 80C) according to the tenth aspect of the embodiment include the protection device (2) for the DC device of the first or second aspect, the DC power supply line (L2), and the DC device (81a). The DC device (81a) has a lighting circuit (811) that converts DC power into load power, and a light source (812) that is lit by the load power.

[0137] The above-described lighting fixtures (81A, 80A to 80C) can achieve both the operation and protection of the DC device (81a) of the disaster prevention lighting fixture (81) by using the AC / DC power supply line (L1) that selectively transmits either AC power or DC power.

Explanation of Signs

[0138] 1 Power supply system 2 DC protection device (protection device) 2a Input section 2b Output section 2c DC connection circuit 2d AC cutoff section 21 Contact 22 Determination section 3c AC connection circuit 3d DC cutoff section 42a Main breaker (switch device) 42b Branch breaker (switch device) 81 Disaster prevention lighting fixture 81A, 80A to 80C Disaster prevention lighting fixtures (lighting fixtures) 81a DC device 811 Emergency lighting circuit (lighting circuit) 812 Emergency light source (light source) 82 Normal lighting fixture 82a AC device 91 AC power source 92 DC power source 9 External power source L0, L1, L11, L101, L102 AC / DC power supply line L2 DC power supply line L3 AC power supply line

Claims

1. A protection device, an AC-DC power supply circuit for transmitting the supplied power from any one of a plurality of external power supplies including at least one AC power supply and at least one DC power supply, a DC power supply circuit for supplying the supplied power to a DC device, an AC power supply circuit for supplying the supplied power to an AC device, and a switch device for conducting or interrupting the AC-DC power supply circuit. The protection device includes an input part connected to the AC-DC power supply circuit, a first output part connected to the DC power supply circuit, a second output part connected to the AC power supply circuit, and a cutoff part for switching the conduction and interruption of a DC connection circuit between the input part and the first output part, and for switching the conduction and interruption of an AC connection circuit between the input part and the second output part. The cutoff part conducts the DC connection circuit and interrupts the AC connection circuit if the supplied power is DC power, and conducts the AC connection circuit and interrupts the DC connection circuit if the supplied power is AC power. A power supply system.

2. The cutoff part includes a determination part for determining whether the supplied power is either the DC power or the AC power, a first contact provided in series in the DC connection circuit, and a second contact provided in series in the AC connection circuit. The first contact turns on if the supplied power is DC power and turns off if the supplied power is AC power based on the determination result of the determination part. The second contact turns on if the supplied power is AC power and turns off if the supplied power is DC power based on the determination result of the determination part. The power supply system according to Claim 1.

3. The protection device interrupts the DC connection circuit when an overcurrent flows through the DC power supply circuit if the supplied power is the DC power. The power supply system according to Claim 1 or 2.

4. The switch device interrupts the AC-DC power supply circuit when an overcurrent flows through the AC-DC power supply circuit if the supplied power is the AC power. The power supply system according to any one of Claims 1 to 3.

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