Lighting fixtures
The lighting fixture addresses the issue of mixed AC/DC power supply by using circuit breakers to switch between AC and DC power, enabling safe and efficient operation of both types of equipment on a shared circuit.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-07-03
Smart Images
Figure 0007884234000001 
Figure 0007884234000002 
Figure 0007884234000003
Abstract
Description
Technical Field
[0001] The present disclosure relates to lighting fixtures.
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 part 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, commercial power lines that respectively construct a lighting power supply system (hereinafter abbreviated as lighting system) and a power outlet power supply system (hereinafter abbreviated as power outlet system) are laid. A plurality of lighting fixtures are connected to the commercial power line of the lighting system. A plurality of power outlets are connected to the commercial power line of the power outlet system. The commercial power lines of the lighting system and the power outlet system are branched into two systems through joints at the secondary side of an overcurrent breaker provided respectively at the power receiving part of the commercial power (100V AC) provided for each guest room area, and are set.
[0004] Then, an AC-DC converter is installed at the power receiving section of the commercial power line of the lighting system on the secondary side (load side) of the overcurrent breaker to convert 100V AC power to DC power of a predetermined voltage (e.g., 24V). This DC power converted by the AC-DC converter is then supplied to the commercial power line of the lighting system. In other words, the commercial power line of the lighting system is used 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 of the lighting system that is supplied with DC power, and they light up using DC power. That is, DC-driven LED lighting fixtures are connected to the existing commercial power line and light up using the existing commercial power line as a DC power line. [Prior art documents] [Patent Documents]
[0005] [Patent Document 1] Japanese Patent Publication No. 2013-247097 [Overview of the project] [Problems that the invention aims to solve]
[0006] In the lighting system described above, DC-driven lighting fixtures are connected to a DC power line (DC supply circuit), and multiple outlets are connected to a commercial power line (AC supply circuit).
[0007] However, in the lighting system described above, the DC and AC power supply lines are completely separated to prevent AC power from being supplied to DC equipment, and no single power supply line serves both purposes. In other words, in the lighting system described above, it was not possible to operate DC equipment using a power supply line that selectively transmits either AC or DC power (AC / DC power supply line).
[0008] Therefore, the purpose of this disclosure is to provide a lighting fixture that can achieve both operation and protection of DC equipment using an AC / DC power supply circuit 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 comprises an input unit, a DC device, an AC device, an AC circuit breaker, and a DC circuit breaker. The input unit is connected to an AC / DC power supply circuit that transmits power from one of a plurality of external power sources, including at least one AC power source and at least one DC power source. The AC circuit breaker switches the conduction and interruption of the DC connection circuit between the DC power supply circuit that supplies the power to the DC device and the AC / DC power supply circuit. The DC circuit breaker switches the conduction and interruption of the AC connection circuit between the AC power supply circuit that supplies the power to the AC device and the AC / DC power supply circuit. The AC circuit breaker allows the DC connection circuit to conduct if the power supply is DC power, and interrupts the DC connection circuit if the power supply is AC power. The DC circuit breaker allows the AC connection circuit to conduct if the power supply is AC power, and interrupts the AC connection circuit if the power supply is DC power. The DC device includes a first lighting circuit and a first light source. The first lighting circuit converts the DC power into a first load power. The first light source is lit by the first load power supplied from the first lighting circuit. The AC device includes a second lighting circuit and a second light source. The second lighting circuit converts the AC power into a 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 explained above, this disclosure has the effect of enabling both the operation and protection of DC equipment by using an AC / DC power supply circuit that selectively transmits either AC power or DC power. [Brief explanation of the drawing]
[0011] [Figure 1] Figure 1 is a block diagram showing a power supply system according to an embodiment. [Figure 2] Figure 2 is a block diagram showing the DC protection devices included in the power supply system described above. [Figure 3] Figure 3 is a circuit diagram showing the DC protection device described above. [Figure 4] Figure 4 is a block diagram showing the AC protection device provided by the same power supply system. [Figure 5] Figure 5 is a circuit diagram showing the AC protection device described above. [Figure 6] Figure 6 is a block diagram showing the operation of the power supply system described above. [Figure 7] Figure 7A is a block diagram showing the emergency lighting fixtures in the same power supply system. Figure 7B is a block diagram showing the normal lighting fixtures in the same system. [Figure 8] Figure 8 is a block diagram showing the lighting fixtures in the same power supply system. [Figure 9] Figure 9 is a block diagram showing a power supply system according to the first modified example. [Figure 10] Figure 10A is a block diagram showing a second modified example of a disaster prevention lighting fixture. Figure 10B is a block diagram showing a second modified example of a normal lighting fixture. [Figure 11] Figure 11A is a block diagram showing a lighting fixture of the second modified example. Figure 11B is a block diagram showing a lighting fixture for normal use of the second modified example. [Figure 12] Figure 12A is a block diagram of a lighting fixture of the third modified example. Figure 12B is a block diagram of a protective device of the third modified example. [Figure 13] Figure 13 is a circuit diagram showing the protective device described above. [Figure 14] Figure 14 is a block diagram showing a part of the lighting fixture of the fourth modified example. [Figure 15] Figure 15 is a block diagram showing a part of another lighting fixture of the fourth modified example. [Modes for carrying out the invention]
[0012] The following embodiments generally relate to a protection device for DC equipment, a power supply system, and a lighting fixture. More specifically, they relate to a protection device for DC equipment that protects DC equipment, a power supply system, and a lighting fixture. 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.
[0013] The protection device for DC equipment, the power supply system, and the lighting fixture of the embodiments are mainly used in apartment houses, detached houses, office buildings, commercial buildings, hotels, factories, or stores, etc. However, the protection device for DC equipment, the power supply system, and the lighting fixture of the embodiments may be used in other facilities other than the above.
[0014] (Embodiment) Hereinafter, a protection device for DC equipment, a power supply system, and a lighting fixture used in an apartment house will be described.
[0015] (1) Outline of the power supply system FIG. 1 shows the configuration of the power supply system 1 of the present embodiment. The power supply system 1 includes a protection device 2 for DC equipment, 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 equipment and an AC power supply line L3. Also, 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 protection device 2 for DC equipment may be referred to as the DC protection device 2, and the protection device 3 for AC equipment may be referred to as the AC protection device 3.
[0016] The switchboard 41 and the DC power supply unit 44 are installed outside each dwelling unit H1, H2,... in the building B1.
[0017] The distribution panel 41 is electrically connected to multiple external power sources 9 (two external power sources 9 in Figure 1) and distributes the power supplied from any one of the multiple external power sources 9 (supplied power) to multiple distribution panels 42 within the building B1 via the AC / DC power supply circuit L0. The multiple 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 Figure 1, the two external power sources 9 are an AC power source 91 and a DC power source 92 of the DC power source unit 44. The AC power source 91 is a commercial power grid that supplies AC power with an effective voltage of 100V. The DC power source 92 includes a rechargeable battery and supplies DC power with a voltage of 100V.
[0018] The DC power supply unit 44 is equipped with a DC power supply 92 and may also be equipped with an auxiliary power supply 44a.
[0019] The DC power supply 92 is equipped with a battery 92a, such as a lithium-ion battery, nickel-metal hydride battery, or lead-acid battery. The DC power supply 92 has a power outage detection function for the AC power supply 91, and when the AC power supply 91 is energized, it charges the battery 92a using the 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 from the battery 92a to the distribution panel 41 as the power supply.
[0020] The auxiliary power supply 44a converts the DC voltage of the battery 92a to a desired voltage to generate auxiliary power, which is then output from an outlet. The auxiliary power can be DC 5V, DC 1.5V, or AC 100V, and outlets such as USB (Universal Serial Bus) outlets, DC outlets, and AC outlets are used.
[0021] The distribution panel 41 distributes AC power supplied from the AC power source 91 or DC power supplied from the DC power source 92 as supplied power to multiple distribution panels 42 within the building B1 via the AC / DC power supply circuit L0. When the AC power source 91 is powered on, 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 is out of service, 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, ... within Building B1. The distribution board 42 is equipped with a main breaker 42a and multiple branch breakers 42b. The power supplied from the distribution board 41 to the distribution board 42 via the AC / DC power supply line L0 is sent to the multiple AC / DC power supply lines L1 branched by the multiple branch breakers 42b via the main breaker 42a. The main breaker 42a corresponds to a switch device that conducts or interrupts the AC / DC power supply line L0. Each of the multiple branch breakers 42b corresponds to a switch device that conducts or interrupts the AC / DC power supply line L1. Furthermore, if the supplied power is AC power, it is preferable that the main breaker 42a is equipped with a tripping device that activates the switching mechanism of the main breaker 42a to interrupt the circuit when an overcurrent flows through the AC / DC power supply line L0. Furthermore, it is preferable that the branch circuit breaker 42b is equipped with a tripping device that activates the switching mechanism of the branch circuit breaker 42b to interrupt the circuit when an overcurrent flows through the AC / DC power supply circuit L1 when the supplied power is AC power. In other words, it is preferable that the main circuit breaker 42a and the branch circuit breaker 42b interrupt the AC / DC power supply circuits L0 and L1 when an overcurrent flows through them when the supplied power is AC power. Therefore, the main circuit breaker 42a and the branch circuit breaker 42b can provide overcurrent protection for the AC / DC power supply circuits L0 and L1 when the supplied power is AC power.
[0023] Multiple AC / DC power supply circuits L1 are circuits for supplying power to each piece of equipment within the dwelling unit H1. Each piece of equipment within the dwelling unit H1 includes emergency lighting fixtures 81, regular lighting fixtures 82, air conditioning equipment 83, and outlets 84. Emergency lighting fixtures 81 have a DC device that uses DC power to illuminate an emergency light source. Regular lighting fixtures 82 have an AC device that uses AC power to illuminate a regular light source. Air conditioning equipment 83 has an AC device that uses AC power to adjust the air conditioning environment within the dwelling unit H1. Outlets 84 have an AC device that supplies AC power to equipment plugged into outlets 84. Hereafter, 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, ... Similarly, when distinguishing between the multiple AC power supply circuits L3, they will be referred to as AC power supply circuits L31, L32, L33, ...
[0024] Of the multiple AC / DC power supply lines L1, AC / DC power supply line L11 is electrically connected to DC power supply line L2 via DC protection device 2, and is also electrically connected to AC power supply line L31 via AC protection device 3. Of the multiple AC / DC power supply lines L1, AC / DC power supply line L12 is electrically connected to AC power supply line L32 via AC protection device 3. Of the multiple AC / DC power supply lines L1, AC / DC power supply line L13 is electrically connected to AC power supply line L33 via AC protection device 3.
[0025] Specifically, AC / DC power supply circuit L11 is electrically connected to the disaster prevention lighting fixture 81 via DC protection device 2 and DC power supply circuit L2, and is electrically connected to the regular lighting fixture 82 via AC protection device 3 and AC power supply circuit L31. AC / DC power supply circuit L12 is electrically connected to the air conditioning equipment 83 via AC protection device 3 and AC power supply circuit L32. AC / DC power supply circuit L13 is electrically connected to the outlet 84 via AC protection device 3 and AC power supply circuit L33. Preferably, a lighting switch 5 for switching the regular lighting fixture 82 on and off is provided in AC power supply circuit L31 to which the regular lighting fixture 82 is electrically connected.
[0026] The DC protection device 2 then transmits only DC power from the AC / DC power supply circuit L1 to the DC power supply circuit L2, thereby supplying only DC power to DC equipment such as the disaster prevention lighting fixture 81, and preventing the supply of AC power to the DC equipment. In other words, the DC protection device 2 protects DC equipment by preventing the supply of AC power to the DC equipment.
[0027] Furthermore, the AC protection device 3 transmits only AC power from the AC / DC power supply circuit L1 to the AC power supply circuit L3, thereby supplying only AC power to AC equipment such as the regular lighting fixtures 82, air conditioning equipment 83, and outlets 84, and preventing the supply of DC power to AC equipment. In other words, the AC protection device 3 protects AC equipment by preventing the supply of DC power to AC equipment.
[0028] In the power supply system 1 shown in Figure 1, the DC protection device 2 (AC interruption unit 2d) that supplies DC power to the disaster prevention lighting fixture 81 equipped with DC equipment, and the AC protection device 3 (DC interruption unit 3d) that supplies AC power to the regular lighting fixture 82 equipped with AC equipment, are connected to a single AC / DC power supply circuit L11. In other words, the power supply circuit for lighting is a shared circuit system in which the disaster prevention lighting fixture 81 and the regular lighting fixture 82 use the same AC / DC power supply circuit L11. Specifically, the single AC / DC power supply circuit L11 branches into two systems. One branch is electrically connected to the DC power supply circuit 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 circuit L31 of the regular lighting fixture 82 via the AC protection device 3.
[0029] Furthermore, a branching device 43 is provided in the AC / DC power supply line L11 before the branching. The branching device 43 branches off the AC / DC power supply line L19 from the AC / DC power supply line L11.
[0030] Note that in Figure 1, the power supply lines, including the AC / DC power supply line L1, DC power supply line L2, and AC power supply line L3 described above, are represented by a single line. However, actual power supply lines include at least two wires, busbars, or conductors.
[0031] (2)DC protection device Figure 2 shows the block configuration of the DC protection device 2. The DC protection device 2 comprises an input section 2a, an output section 2b, a DC connection circuit 2c, and an AC interruption section 2d.
[0032] The input section 2a is electrically connected to the AC / DC power supply circuit L1 and receives power supplied from the AC / DC power supply circuit L1. The input section 2a has conductors such as terminals, solder, or circuit patterns on a circuit board to which the AC / DC power supply circuit L1 is electrically connected.
[0033] The output unit 2b is electrically connected to the DC power supply line L2 and outputs power (DC power) to be supplied to the DC power supply line L2. The output unit 2b has conductors such as terminals, solder, or circuit patterns to which the DC power supply line L2 is electrically connected.
[0034] The DC connection circuit 2c is the circuit between the input section 2a and the output section 2b, and is composed of conductors such as wires, circuit patterns on a circuit board, or busbars.
[0035] The AC interruption unit 2d switches between conducting and interrupting the DC connection circuit 2c. Specifically, the AC interruption unit 2d includes a contact 21 and a determination unit 22.
[0036] Contact 21 is composed of at least a part of a mechanical relay or a semiconductor relay and is connected in series with the DC connection circuit 2c. When contact 21 is turned on, the DC connection circuit 2c conducts, and when contact 21 is turned off, the DC connection circuit 2c is interrupted. In other words, when contact 21 is turned on, there is conduction between the AC / DC power supply circuit L1 and the DC power supply circuit L2, and when contact 21 is turned off, there is interruption between the AC / DC power supply circuit L1 and the DC power supply circuit L2.
[0037] The determination unit 22 monitors the voltage of the AC / DC power supply circuit L1 and determines whether the power supplied by the AC / DC power supply circuit 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 using discrete components such as resistors, capacitors, and transistors, or it may be configured with a computer that performs at least some of the functions of the determination unit 22 by executing software.
[0038] Figure 3 shows an example of the circuit configuration of the DC protection device 2.
[0039] The input section 2a consists of a pair of input terminals 201 and 202. The output section 2b consists of a pair of output terminals 203 and 204. The AC / DC power supply circuit L1 has a pair of circuits L1a and L1b, with input terminal 201 connected to circuit L1a and input terminal 202 connected to circuit L1b. The DC power supply circuit L2 has a pair of circuits L2a and L2b, with output terminal 203 connected to circuit L2a and output terminal 204 connected to circuit L2b.
[0040] The determination unit 22 includes resistors R1 to R3, capacitors C1 and C2, triac Q1, relay K1, and a drive coil K21 for relay K2. The series circuit of capacitor C1 and 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 circuit L1a to circuit L1b. The drive coil K11 for relay K1 and the series circuit of triac Q1 are connected in parallel to the series circuit of capacitor C1 and resistors R1 and R2. The gate of triac Q1 is connected to the connection point of resistors R1 and R2 via resistor R3. Capacitor C2 is connected in parallel to resistor R2. The series circuit of the contact K12 of relay K1 and the drive coil K21 of relay K2 is connected between a pair of input terminals 201 and 202.
[0041] Contact 21 is composed of contact K22 of relay K2. Contact K22 is a normally closed b-contact, and if no coil current flows through the drive coil K21, contact K22 closes and contact 21 turns ON. When coil current flows through the drive coil K21, contact K22 opens and contact 21 turns OFF.
[0042] Input terminal 201 is electrically connected to output terminal 203 via contact K22 (contact 21), and input terminal 202 is electrically connected to output terminal 204. The circuit between input terminal 201 and output terminal 203, and the circuit between input terminal 202 and output terminal 204 constitute the DC connection circuit 2c.
[0043] When DC power is supplied 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 capacitor C1 and resistors R1 and R2, but since capacitor C1 functions as a DC-blocking capacitor, no gate current flows to the gate of triac Q1, and triac Q1 turns off. When triac Q1 turns off, no coil current flows to the drive coil K11, and contact K12 turns off. When contact K12 turns off, no coil current flows to the drive coil K21, and contact K22 closes. Therefore, when DC power is supplied to the AC / DC power supply circuit L1, contact 21 turns on, and the DC connection circuit 2c conducts.
[0044] Furthermore, when AC power is supplied 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 capacitor C1 and resistors R1 and R2, causing gate current to flow to the gate of triac Q1, and triac Q1 turns on. When triac Q1 turns on, coil current flows to the drive coil K11, and contact K12 turns on. When contact K12 turns on, coil current flows to the drive coil K21, and contact K22 opens. Therefore, when AC power is supplied to the AC / DC power supply circuit L1, contact 21 turns off, and the DC connection circuit 2c is interrupted.
[0045] In the DC protection device 2 described above, the AC / DC power supply circuit L1 is connected to the input section 2a, and the DC power supply circuit L2 is connected to the output section 2b. The DC protection device 2 then conducts power between the AC / DC power supply circuit L1 and the DC power supply circuit L2 if the power supplied by the AC / DC power supply circuit L1 is DC power, thereby transmitting DC power to the DC power supply circuit L2. The disaster prevention lighting fixture 81 lights up by receiving DC power from the DC power supply circuit L2. In other words, the disaster prevention lighting fixture 81 lights up with DC power when the AC power supply 91 is shut down.
[0046] Furthermore, if the power supplied by the AC / DC power supply circuit L1 is AC power, the DC protection device 2 will interrupt the connection between the AC / DC power supply circuit L1 and the DC power supply circuit L2, preventing AC power from being transmitted to the DC power supply circuit L2. Since the disaster prevention lighting fixture 81 is not supplied with AC power from the DC power supply circuit L2, the DC components of the disaster prevention lighting fixture 81 are 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 in the disaster prevention lighting fixture 81 by using AC / DC power supply circuits L0 and L1 that selectively supply either AC power or DC power.
[0048] Furthermore, the overcurrent protection unit 2e (see Figure 2) monitors the magnitude of the current (DC current) flowing through the DC power supply circuit L2 and compares the magnitude of the DC current with a threshold. When the magnitude of the DC current exceeds the threshold, the overcurrent protection unit 2e determines that an overcurrent has occurred and turns off the contact 21. In other words, when the supplied power is DC power, the overcurrent protection unit 2e shuts off the DC connection circuit 2c when an overcurrent flows through the DC power supply circuit L2. Therefore, the DC protection device 2 can provide overcurrent protection for the DC power supply circuit L2 when the supplied power is DC power.
[0049] (3)AC protection device Figure 4 shows the block configuration of the AC protection device 3. The AC protection device 3 comprises an input unit 3a, an output unit 3b, an AC connection circuit 3c, and a DC interruption unit 3d.
[0050] The input section 3a is electrically connected to the AC / DC power supply circuit L1 and receives power supplied from the AC / DC power supply circuit L1. The input section 3a has conductors such as terminals, solder, or circuit patterns on a circuit board to which the AC / DC power supply circuit L1 is electrically connected.
[0051] The output unit 3b is electrically connected to the AC power supply line L3 and outputs power (AC power) to the AC power supply line L3. The output unit 3b has conductors such as terminals, solder, or circuit patterns to which the AC power supply line L3 is electrically connected.
[0052] The AC connection circuit 3c is the circuit between the input section 3a and the output section 3b, and is composed of conductors such as wires, circuit patterns on a circuit board, or busbars.
[0053] The DC circuit breaker 3d switches between conducting and interrupting the AC connection circuit 3c. Specifically, the DC circuit breaker 3d includes a contact 31 and a determination unit 32.
[0054] Contact 31 is composed of at least a part of a mechanical relay or a semiconductor relay and is connected in series with the AC connection circuit 3c. When contact 31 is turned on, the AC connection circuit 3c conducts, and when contact 31 is turned off, the AC connection circuit 3c is interrupted. In other words, when contact 31 is turned on, there is conduction between the AC / DC power supply circuit L1 and the AC power supply circuit L3, and when contact 31 is turned off, there is interruption between the AC / DC power supply circuit L1 and the AC power supply circuit L3.
[0055] The determination unit 32 monitors the voltage of the AC / DC power supply circuit L1 and determines whether the power supplied by the AC / DC power supply circuit 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 using discrete components such as resistors, capacitors, and transistors, or it may be configured with a computer that performs at least some of the functions of the determination unit 32 by executing software.
[0056] Figure 4 shows an example of the circuit configuration of the AC protection device 3.
[0057] The input section 3a consists of a pair of input terminals 301 and 302. The output section 3b consists of a pair of output terminals 303 and 304. The AC / DC power supply circuit L1 has a pair of circuits L1a and L1b, with input terminal 301 connected to circuit L1a and input terminal 302 connected to circuit L1b. The AC power supply circuit L3 has a pair of circuits L3a and L3b, with output terminal 303 connected to circuit L3a and output terminal 304 connected to circuit L3b.
[0058] The determination unit 32 includes resistors R11 to R13, capacitors C11 and C12, triac Q2, relay K3, and the drive coil K41 of relay K4. The series circuit of 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 circuit L1a to circuit L1b. The series circuit of capacitor C11 and resistors R11 and R12 has the drive coil K31 of relay K3 and the series circuit of triac Q2 connected in parallel. The gate of triac Q2 is connected to the connection point of resistors R11 and R12 via resistor R13. Capacitor C12 is connected in parallel to resistor R12. The series circuit of the contact K32 of relay K3 and the drive coil K41 of relay K4 is connected between a pair of input terminals 301 and 302.
[0059] Contact 31 is composed of contact K42 of relay K4. Contact K42 is a normally open (a) contact, and if no coil current flows through the drive coil K41, contact K42 opens and contact 31 turns off. When coil current flows through the drive coil K41, contact K42 closes and contact 31 turns on.
[0060] Input terminal 301 is electrically connected to output terminal 303 via contact K42 (contact 31), and input terminal 302 is electrically connected to output terminal 304. The circuit between input terminal 301 and output terminal 303, and the circuit between input terminal 302 and output terminal 304 constitute the AC connection circuit 3c.
[0061] When AC power is supplied 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 capacitor C11 and resistors R11 and R12, causing gate current to flow to the gate of triac Q2, and triac Q2 turns on. When triac Q2 turns on, coil current flows to the drive coil K31, and contact K32 turns on. When contact K32 turns on, coil current flows to the drive coil K41, and contact K42 closes. Therefore, when AC power is supplied to the AC / DC power supply circuit L1, contact 31 turns on, and the AC connection circuit 3c conducts.
[0062] Furthermore, when DC power is supplied 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 capacitor C11 and resistors R11 and R12, but since capacitor C11 functions as a DC cut capacitor, no gate current flows to the gate of triac Q2, and triac Q2 turns off. When triac Q2 turns off, no coil current flows to the drive coil K31, and contact K32 turns off. When contact K32 turns off, no coil current flows to the drive coil K41, and contact K42 closes. Therefore, when DC power is supplied to the AC / DC power supply circuit L1, contact 31 turns off, and the AC connection circuit 3c is interrupted.
[0063] In the AC protection device 3 described above, the AC / DC power supply circuit L1 is connected to the input section 3a, and the AC power supply circuit L3 is connected to the output section 3b. The AC protection device 3 transmits AC power to the AC power supply circuit L3 by conducting electricity between the AC / DC power supply circuit L1 and the AC power supply circuit L3 if the power supplied by the AC / DC power supply circuit L1 is AC power. The regular lighting fixture 82, the air conditioning equipment 83, and the outlet 84 operate by receiving AC power from the AC power supply circuit L3. That is, when the AC power supply 91 is energized, the regular lighting fixture 82 lights up with AC power when the lighting switch 5 is turned on, and turns off when the lighting switch 5 is turned off. When the AC power supply 91 is energized, the air conditioning equipment 83 operates with AC power, and the outlet 84 supplies AC power to the equipment plugged into the outlet 84.
[0064] Furthermore, if the AC protection device 3 is supplying DC power from the AC / DC power supply circuit L1, it will interrupt the connection between the AC / DC power supply circuit L1 and the AC power supply circuit L3, preventing DC power from being transmitted to the AC power supply circuit L3. Since the regular lighting fixture 82, air conditioning equipment 83, and outlet 84 are not supplied with DC power from the AC power supply circuit L3, the AC equipment connected to the regular lighting fixture 82, air conditioning equipment 83, and outlet 84 is protected. At this time, the regular lighting fixture 82 will turn off, the air conditioning equipment 83 will stop, and the outlet 84 will not supply power.
[0065] Therefore, the AC protection device 3 can use AC / DC power supply circuits L0 and L1, which selectively supply either AC power or DC power, to achieve both operation and protection of the AC equipment in the regular lighting fixtures 82, air conditioning equipment 83, and outlets 84.
[0066] (4) Operation of the power supply system The power supply system 1, which includes the DC protection device 2 and AC protection device 3 described above, operates as follows.
[0067] When the AC power supply 91 is energized, the distribution board 41 sends the AC power from the AC power supply 91 to the AC / DC power supply circuit L0. The distribution board 42 then branches the AC power from the AC / DC power supply circuit L0 to multiple AC / DC power supply circuits L1 via multiple branch breakers 42b. As shown in Figure 1, the AC interruption unit 2d of the DC protection device 2 is turned off, and the DC interruption unit 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 according to the on / off status of the lighting switch 5. In addition, the air conditioning equipment 83 and outlet 84 connected to the AC protection device 3 can perform the functions of their respective AC devices.
[0068] When the AC power supply 91 is interrupted, the distribution panel 41 sends DC power from the DC power supply 92 to the AC / DC power supply circuit L0. The distribution panel 42 then branches the DC power from the AC / DC power supply circuit L0 to multiple AC / DC power supply circuits L1 via multiple branch breakers 42b. As shown in Figure 6, the AC interruption unit 2d of the DC protection device 2 is turned on, and the DC interruption unit 3d of the AC protection device 3 is turned off. Therefore, when the AC power supply 91 is interrupted, the emergency lighting fixture 81 connected to the DC protection device 2 lights up, and the regular lighting fixture 82 connected to the AC protection device 3 turns off. In addition, the air conditioning equipment 83 and outlet 84 connected to the AC protection device 3 become unable to perform the functions of their respective AC devices.
[0069] Figure 7A shows the block configuration of the disaster prevention lighting fixture 81. The disaster prevention lighting fixture 81 houses DC equipment 81a in the fixture body 8A, and the DC equipment 81a includes an emergency lighting circuit 811 and an emergency light source 812.
[0070] The emergency light source 812 comprises at least one solid-state light-emitting element. For example, the emergency light source 812 may have an LED array in which multiple LEDs (Light Emitting Diodes) are connected in series as multiple solid-state light-emitting elements. However, the emergency light source 812 is not limited to having LEDs as solid-state light-emitting elements. The emergency light source 812 may have other solid-state light-emitting elements such as organic electroluminescence (OEL) or semiconductor laser diodes (LD).
[0071] The emergency lighting circuit 811 is a switching power supply circuit. The configuration of the switching power supply circuit is not limited to a specific configuration, but may include, for example, an isolated flyback converter. 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 and supplies a 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 DC power into load power, and the emergency light source 812 lights up with the load power.
[0072] Figure 7B shows the block configuration of the regular lighting fixture 82. The regular lighting fixture 82 houses AC equipment 82a in the fixture body 8B, and the AC equipment 82a comprises a regular lighting circuit 821 and a regular light source 822.
[0073] The regular light source 822 comprises at least one solid-state light-emitting element. For example, the regular light source 822 has an LED array in which multiple LEDs are connected in series as multiple solid-state light-emitting elements. However, the regular light source 822 is not limited to a configuration having LEDs as solid-state light-emitting elements. The regular light source 822 may have other solid-state light-emitting elements such as organic ELs or semiconductor laser diodes.
[0074] The regular lighting circuit 821 is a switching power supply circuit. The configuration of the switching power supply circuit is not limited to a specific configuration, but may include, for example, an isolated flyback converter. When the regular lighting circuit 821 receives AC power from the AC power supply line L3, it converts the AC power into DC load power and supplies a DC load current to the regular light source 822, thereby lighting the regular light source 822. In other words, the regular lighting circuit 821 converts AC power into load power, and the regular light source 822 lights up with the load power.
[0075] The power supply system 1 may also use a lighting fixture 80 that integrates a disaster prevention lighting fixture 81 (Figure 7A) and a regular lighting fixture 82 (Figure 7B), as shown in Figure 8. The lighting fixture 80 houses the aforementioned DC equipment 81a and AC equipment 82a in the fixture body 8C. In other words, the lighting fixture 80 serves as both a disaster prevention lighting fixture 81 and a regular lighting fixture 82.
[0076] The aforementioned disaster prevention lighting fixtures 81 and 80 are power supply-separated type disaster prevention lighting fixtures that receive power from a DC power supply 92, which is configured separately from the fixture body, to illuminate the emergency light source 812 in an emergency. By combining such power supply-separated type disaster prevention lighting fixtures with the aforementioned DC protection device 2, the power supply system 1 can use AC / DC power supply circuits L0 and L1 that selectively transmit either AC power or DC power. Therefore, the power supply system 1 can use power supply-separated type disaster prevention lighting fixtures while suppressing the length of the DC power supply circuit L2 that transmits only DC power. In addition, by using power supply-separated type disaster prevention lighting fixtures, the power supply system 1 can easily inspect the battery 92a of the DC power supply 92.
[0077] (5) First variation Figure 9 shows the configuration of power supply system 1A as a modified example of power supply system 1.
[0078] In the power supply system 1A, the AC circuit breaker 2d (DC protection device 2) that supplies DC power to the disaster prevention lighting fixture 81 equipped with DC equipment, and the DC circuit breaker 3d (AC protection device 3) that supplies AC power to the regular lighting fixture 82 equipped with AC equipment, are connected to two or more AC / DC power supply circuits L101 and L102, respectively, which are different from each other. In other words, the power supply circuits for lighting are a dedicated circuit system in which the AC / DC power supply circuit L101 used by the disaster prevention lighting fixture 81 and the AC / DC power supply circuit L102 used by the regular lighting fixture 82 are different.
[0079] Specifically, the power supplied from the distribution board 41 to the distribution panel 42 via the AC / DC power supply line L0 is sent via the main breaker 42a to multiple AC / DC power supply lines L1 that are branched off by multiple branch breakers 42b. Hereafter, when distinguishing between the multiple AC / DC power supply lines L1, they will be referred to as AC / DC power supply lines L101, L102, L103, ... Similarly, when distinguishing between the multiple AC power supply lines L3, they will be referred to as AC power supply lines L301, L302, L303, ...
[0080] Of the multiple AC / DC power supply lines L1, AC / DC power supply line L101 is electrically connected to DC power supply line L2 via DC protection device 2. Of the multiple AC / DC power supply lines L1, AC / DC power supply line L102 is electrically connected to AC power supply line L301 via AC protection device 3. Of the multiple AC / DC power supply lines L1, AC / DC power supply line L103 is electrically connected to AC power supply line L302 via AC protection device 3. Of the multiple AC / DC power supply lines L1, AC / DC power supply line L104 is electrically connected to AC power supply line L303 via AC protection device 3.
[0081] AC / DC power supply circuit L101 is electrically connected to the disaster prevention lighting fixture 81 via DC protection device 2 and DC power supply circuit L2. AC / DC power supply circuit L102 is electrically connected to the regular lighting fixture 82 via AC protection device 3 and AC power supply circuit L301. AC / DC power supply circuit L103 is electrically connected to the outlet 84 via AC protection device 3 and AC power supply circuit L302. AC / DC power supply circuit L104 is electrically connected to the air conditioning equipment 83 via AC protection device 3 and AC power supply circuit L303. Preferably, a lighting switch 5 for switching the regular lighting fixture 82 on and off is provided in AC power supply circuit L301 to which the regular lighting fixture 82 is electrically connected.
[0082] When the AC power supply 91 is energized, the distribution board 41 sends the AC power from the AC power supply 91 to the AC / DC power supply circuit L0. The distribution board 42 then branches the AC power from the AC / DC power supply circuit L0 to multiple AC / DC power supply circuits L1 via multiple branch breakers 42b. The AC interruption unit 2d of the DC protection device 2 is turned off, and the DC interruption unit 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 according to the on / off status of the lighting switch 5. In addition, the air conditioning equipment 83 and outlet 84 connected to the AC protection device 3 can perform the functions of their respective AC devices.
[0083] When the AC power supply 91 is interrupted, the distribution panel 41 sends DC power from the DC power supply 92 to the AC / DC power supply circuit L0. The distribution panel 42 then branches the DC power from the AC / DC power supply circuit L0 to multiple AC / DC power supply circuits L1 via multiple branch breakers 42b. As shown in Figure 9, the AC interruption unit 2d of the DC protection device 2 is turned on, and the DC interruption unit 3d of the AC protection device 3 is turned off. Therefore, when the AC power supply 91 is interrupted, the emergency lighting fixture 81 connected to the DC protection device 2 lights up, and the regular lighting fixture 82 connected to the AC protection device 3 turns off. In addition, the air conditioning equipment 83 and outlet 84 connected to the AC protection device 3 become unable to perform the functions of their respective AC devices.
[0084] (6) Second variation Figures 10A, 10B, 11A, and 11B each show modified examples of lighting fixtures.
[0085] The disaster prevention lighting fixture 81A in Figure 10A includes a DC equipment 81a, a DC protection device 2, and a DC power supply circuit L2, with the DC equipment 81a, DC protection device 2, and DC power supply circuit L2 housed in the fixture body 8D. In other words, the disaster prevention lighting fixture 81A integrates the DC equipment 81a, DC protection device 2, and DC power supply circuit L2 into a single unit.
[0086] The regular lighting fixture 82A in Figure 10B includes an AC equipment 82a, an AC protection device 3, and an AC power supply circuit L3, with the AC equipment 82a, AC protection device 3, and AC power supply circuit L3 housed in the fixture body 8E. In other words, the regular lighting fixture 82A integrates the AC equipment 82a, AC protection device 3, and AC power supply circuit L3 into a single unit.
[0087] The power supply system 1 may also use a lighting fixture 80A that integrates a disaster prevention lighting fixture 81A (see Figure 10A) and a regular lighting fixture 82A (see Figure 10B), as shown in Figure 11A. The lighting fixture 80A has a fixture body 8F into which two AC / DC power supply circuits L1 are drawn, and the fixture body 8F houses the DC protection device 2, AC protection device 3, DC power supply circuit L2, AC power supply circuit L3, DC equipment 81a, and AC equipment 82a. In other words, the lighting fixture 80A serves as both a disaster prevention lighting fixture 81A and a regular lighting fixture 82A using the two AC / DC power supply circuits L1.
[0088] The lighting fixture 80B in Figure 11B is equipped with a fixture body 8G into which one AC / DC power supply circuit L1 is drawn, and the fixture body 8G houses the aforementioned DC protection device 2, AC protection device 3, DC power supply circuit L2, AC power supply circuit L3, DC equipment 81a, and AC equipment 82a. In other words, the lighting fixture 80B serves as both an emergency lighting fixture 81A and a regular lighting fixture 82A using one AC / DC power supply circuit L1.
[0089] (7) Third variation The lighting fixture 80C in Figure 12A is equipped with a single protective device 6 that has the functions of both the DC protective device 2 and the AC protective device 3, instead of the DC protective device 2 and the AC protective device 3 of the lighting fixture 80B (see Figure 11B).
[0090] Figure 12B shows the configuration of the protective device 6. The protective device 6 comprises an input section 6a, output sections 6b and 6c, a DC connection circuit 6d, an AC connection circuit 6e, and a circuit breaker 6f.
[0091] The input section 6a is electrically connected to the AC / DC power supply circuit L1 and receives power supplied from the AC / DC power supply circuit L1. The input section 6a has conductors such as terminals, solder, or circuit patterns on a circuit board to which the AC / DC power supply circuit L1 is electrically connected.
[0092] The output unit 6b is electrically connected to the DC power supply line L2 and outputs power (DC power) to be supplied to the DC power supply line L2. The output unit 6b has conductors such as terminals, solder, or circuit patterns 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 power (AC power) to the AC power supply line L3. The output unit 6c has conductors such as terminals, solder, or circuit patterns to which the AC power supply line L3 is electrically connected.
[0094] The DC connection circuit 6d is the circuit between the input section 6a and the output section 6b, and is composed of conductors such as wires, circuit patterns on a circuit board, or busbars.
[0095] The AC connection circuit 6e is the circuit between the input section 6a and the output section 6c, and is composed of conductors such as wires, circuit patterns on a circuit board, or busbars.
[0096] The circuit breaker 6f has the functions of both an AC circuit breaker 2d (see Figure 2) and a DC circuit breaker 3d (see Figure 4). The circuit breaker 6f switches the conduction and interruption of the DC connection circuit 6d and switches the conduction and interruption of the AC connection circuit 6e. Specifically, the circuit breaker 6f includes contacts 61 and 62 and a determination unit 63.
[0097] Contact 61 is composed of at least a part of a mechanical relay or a semiconductor relay and is connected in series with the DC connection circuit 6d. When contact 61 is turned on, the DC connection circuit 6d conducts, and when contact 61 is turned off, the DC connection circuit 6d is interrupted. In other words, when contact 61 is turned on, conduction occurs between the AC / DC power supply circuit L1 and the DC power supply circuit L2, and when contact 61 is turned off, the connection between the AC / DC power supply circuit L1 and the DC power supply circuit L2 is interrupted.
[0098] Contact 62 is composed of at least a part of a mechanical relay or a semiconductor relay and is connected in series with the AC connection circuit 6e. When contact 62 is turned on, the AC connection circuit 6e conducts, and when contact 62 is turned off, the AC connection circuit 6e is interrupted. In other words, when contact 62 is turned on, conduction occurs between the AC / DC power supply circuit L1 and the AC power supply circuit L3, and when contact 62 is turned off, the connection between the AC / DC power supply circuit L1 and the AC power supply circuit L3 is interrupted.
[0099] The determination unit 63 monitors the voltage of the AC / DC power supply circuit L1 and determines whether the power supplied by the AC / DC power supply circuit L1 is AC power or DC power. Based on the determination result, the determination unit 63 turns on contact 61 and off contact 62 if the supplied power is DC power. If the supply power is AC power, the determination unit 63 turns off contact 61 and on contact 62. The determination unit 63 may be configured with discrete components such as resistors, capacitors, and transistors, or it may be configured with a computer that executes software to realize at least some of the functions of the determination unit 63.
[0100] Figure 13 shows an example of the circuit configuration of the protective device 6.
[0101] The input section 6a consists of a pair of input terminals 601 and 602. The output section 6b consists of a pair of output terminals 603 and 605. The output section 6c consists of a pair of output terminals 604 and 605. The AC / DC power supply circuit L1 has a pair of circuits L1a and L1b, with input terminal 601 connected to circuit L1a and input terminal 602 connected to circuit L1b. The DC power supply circuit L2 has a pair of circuits L2a and L0a, with output terminal 603 connected to circuit L2a and output terminal 605 connected to circuit L0a. The AC power supply circuit L3 has a pair of circuits L3a and L0a, with output terminal 604 connected to circuit L3a and output terminal 605 connected to circuit L0a.
[0102] The determination unit 63 includes resistors R21 to R23, capacitors C21 and C22, triac Q3, relay K5, the drive coil K61 for relay K6, and the drive coil K71 for relay K7. The series circuit of 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 circuit L1a to circuit L1b. The drive coil K51 for relay K5 and the series circuit of triac Q3 are connected in parallel to the series circuit of capacitor C21 and resistors R21 and R22. The gate of triac Q3 is connected to the connection point of resistors R21 and R22 via resistor R23. Capacitor C22 is connected in parallel to resistor R22.
[0103] The contact K52 of 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 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 open. If coil current flows through the drive coil K51 of relay K5, the connection between the movable terminal T1 and the normally open terminal T2 is open, and the connection between the movable terminal T1 and the normally closed terminal T3 is interrupted.
[0104] The normally closed terminal T3 of contact K52 is electrically connected to input terminal 601 via the drive coil K61 of relay K6. The normally open terminal T2 of contact K52 is electrically connected to input terminal 601 via the drive coil K71 of relay K7. The movable terminal T1 of contact K52 is electrically connected to input terminal 602.
[0105] Contact 61 is composed of contact K62 of relay K6. Contact K62 is a normally open (a) contact, and if no coil current flows through the drive coil K61, contact K62 opens and contact 61 turns off. When coil current flows through the drive coil K61, contact K62 closes and contact 61 turns on.
[0106] Contact 62 is composed of contact K72 of relay K7. Contact K72 is a normally open (a) contact, and if no coil current flows through the drive coil K71, contact K72 opens and contact 62 turns off. When coil current flows through the drive coil K71, contact K72 closes and contact 62 turns on.
[0107] Input terminal 601 is electrically connected to output terminal 603 via contact K62 (contact 61). Input terminal 601 is electrically connected to output terminal 604 via contact K72 (contact 62). Input terminal 602 is electrically connected to output terminal 605. The circuit between input terminal 601 and output terminal 603, and the circuit between input terminal 602 and output terminal 605 constitute DC connection circuit 6d. The circuit between input terminal 601 and output terminal 604, and the circuit between input terminal 602 and output terminal 605 constitute AC connection circuit 6e.
[0108] When DC power is supplied 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 capacitor C21 and resistors R21 and R22, but since capacitor C21 functions as a DC cut-off capacitor, no gate current flows to the gate of triac Q3, and triac Q3 turns off. When triac Q3 turns off, no coil current flows to 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, coil current flows to the drive coil K61, and contact K62 closes. Also, no coil current flows to the drive coil K71, and contact K72 opens. Therefore, when DC power is supplied to the AC / DC power supply circuit L1, contact 61 turns on, the DC connection circuit 6d conducts, and contact 62 turns off, the AC connection circuit 6e is interrupted.
[0109] Furthermore, when AC power is supplied 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 capacitor C21 and resistors R21 and R22, causing gate current to flow to the gate of triac Q3, and triac Q3 turns on. When triac Q3 turns on, coil current flows through the drive coil K51, causing conduction between the movable terminal T1 and the normally open terminal T2, and disconnection between the movable terminal T1 and the normally closed terminal T3. As a result, coil current flows through the drive coil K71, and contact K72 closes. Also, no coil current flows through the drive coil K61, and contact K62 opens. Therefore, when AC power is supplied to the AC / DC power supply circuit L1, contact 62 turns on, the AC connection circuit 6e conducts, and contact 61 turns off, the DC connection circuit 6d is interrupted.
[0110] The protection device 6 described above, if the power supplied by the AC / DC power supply circuit L1 is DC power, will conduct electricity between the AC / DC power supply circuit L1 and the DC power supply circuit L2, and disconnect the AC / DC power supply circuit L1 and the AC power supply circuit L3, thereby transmitting DC power to the DC power supply circuit L2. Furthermore, if the power supplied by the AC / DC power supply circuit L1 is AC power, the protection device 6 will conduct electricity between the AC / DC power supply circuit L1 and the AC power supply circuit L3, and disconnect the AC / DC power supply circuit L1 and the DC power supply circuit L2, thereby transmitting AC power to the AC power supply circuit L3.
[0111] Therefore, the protective device 6 can achieve both operation and protection of DC equipment by using AC / DC power supply circuits L0 and L1 that selectively transmit either AC power or DC power.
[0112] (8) Fourth variation The lighting fixtures 80 in Figure 8, 80A in Figure 11A, 80B in Figure 11B, and 80C in Figure 12A may be equipped with a dual-purpose light source 800 as shown in Figure 14 instead of the emergency light source 812 and the normal light source 822. The dual-purpose light source 800 comprises at least one solid-state light-emitting element. The dual-purpose light source 800 is illuminated by the emergency lighting circuit 811 if the supplied power is DC power, and by the normal lighting circuit 821 if the supplied power is AC power. It is preferable that the light output of the dual-purpose light source 800 by the emergency lighting circuit 811 and the light output of the dual-purpose light source 800 by the normal lighting circuit 821 be different.
[0113] The lighting fixture in Figure 14 may be equipped with a lighting circuit 801 as shown in Figure 15 instead of the emergency lighting circuit 811 and the normal lighting circuit 821. The lighting circuit 801 incorporates the DC protection device 2 and AC protection device 3 described above, and if the supplied power is DC power, it will provide emergency lighting for the dual-purpose light source 800, and if the supplied power is AC power, it will provide normal lighting for the dual-purpose light source 800. It is preferable that the lighting circuit 801 makes the light output of the dual-purpose light source 800 different during emergency lighting and during normal lighting.
[0114] (9) Fifth variation At least one of the DC protection device 2 and the AC protection device 3 may be built into the branch circuit breaker 42b.
[0115] Furthermore, at least one of the regular lighting fixtures 82, air conditioning equipment 83, and outlets 84 may have a built-in AC protection device 3.
[0116] Furthermore, the distribution board 41 and the DC power supply unit 44 may be installed on the roof of building B1 or in an electrical room, etc.
[0117] (10) Summary As described above, the DC equipment protection device (2) according to the first embodiment comprises an input unit (2a), an output unit (2b), and an AC circuit breaker (2d). The input unit (2a) is connected to an AC / DC power supply circuit (L1) that transmits power supplied from any 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 circuit (L2) that supplies power to the DC equipment (81a). The AC circuit breaker (2d) switches the conduction and interruption of the DC connection circuit (2c) between the input unit (2a) and the output unit (2b). The AC circuit breaker (2d) conducts the DC connection circuit (2c) if the supplied power is DC power, and interrupts the DC connection circuit (2c) if the supplied power is AC power.
[0118] The DC equipment protection device (2) described above uses an AC / DC power supply circuit (L1) that selectively transmits either AC power or DC power, thereby enabling both the operation and protection of the DC equipment (81a) of the disaster prevention lighting fixture (81).
[0119] In the DC equipment protection device (2) of the second embodiment according to the embodiment, in the first embodiment, the AC interruption unit (2d) preferably comprises a determination unit (22) that determines whether the supplied power is DC power or AC power, and a contact (21) provided in series with the DC connection circuit (2c). The contact (21) 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 unit (22).
[0120] The DC equipment protection device (2) described above uses an AC / DC power supply circuit (L1) that selectively transmits either AC power or DC power, thereby enabling both the operation and protection of the DC equipment (81a) of the disaster prevention lighting fixture (81).
[0121] A third embodiment of the power supply system (1) according to the embodiment comprises a DC equipment protection device (2) according to the first or second embodiment, an AC / DC power supply line (L1), and a DC power supply line (L2).
[0122] The aforementioned power supply system (1) uses an AC / DC power supply circuit (L1) that selectively transmits either AC power or DC power, enabling both the operation and protection of the DC equipment (81a) of the disaster prevention lighting fixture (81).
[0123] In the fourth embodiment of the power supply system (1) according to the embodiment, in the third embodiment, the DC equipment protection device (2) preferably shuts off the DC connection circuit (2c) when an overcurrent flows through the DC power supply circuit (L2) when the supplied power is DC power.
[0124] The aforementioned power supply system (1) can provide overcurrent protection for the DC power supply circuit (L2) when the supplied power is DC power.
[0125] In the fifth embodiment of the power supply system (1) according to the embodiment, it is preferable that the system further comprises switch devices (42a, 42b) for conducting or interrupting AC / DC power supply circuits (L0, L1) in the third or fourth embodiment.
[0126] The aforementioned power supply system (1) can easily switch the power supply to the equipment within the system.
[0127] In the power supply system (1) of the sixth embodiment according to the embodiment, in the fifth embodiment, it is preferable that the switch devices (42a, 42b) interrupt the AC / DC power supply circuits (L0, L1) when an overcurrent flows through them, if the supplied power is AC power.
[0128] The aforementioned power supply system (1) can provide overcurrent protection for the AC / DC power supply circuits (L0, L1) when the supplied power is AC power.
[0129] The power supply system (1) according to the seventh embodiment preferably further comprises a DC interruption unit (3d) in any one of the third to sixth embodiments that switches the conduction and interruption of the AC connection circuit (3c) between the AC power supply circuit (L3) that supplies power to the AC equipment (82a) and the AC / DC power supply circuit (L1). The DC interruption unit (3d) conducts the AC connection circuit (3c) if the supplied power is AC power, and interrupts the AC connection circuit (3c) if the supplied power is DC power.
[0130] The power supply system (1) described above can achieve both operation and protection of AC equipment (82a) by using an AC / DC power supply circuit (L1) that selectively transmits either AC power or DC power.
[0131] In the eighth embodiment of the power supply system (1), in the seventh embodiment, it is preferable that the AC interruption unit (2d) that supplies DC power to the disaster prevention lighting fixture (81) equipped with DC equipment (81a) and the DC interruption unit (3d) that supplies AC power to the regular lighting fixture (82) equipped with AC equipment (82a) are connected to a single AC / DC power supply circuit (L11).
[0132] The above-mentioned power supply system (1) can be configured as a shared circuit system in which the power supply circuit for lighting uses the same AC / DC power supply circuit (L11) for both disaster prevention lighting fixtures (81) and regular lighting fixtures (82).
[0133] In the power supply system (1) of the ninth embodiment, in the seventh embodiment, the number of AC / DC power supply lines (L1) is two or more. An AC circuit breaker (2d) that supplies DC power to an emergency lighting fixture (81) equipped with DC equipment (81a) and a DC circuit breaker (3d) that supplies AC power to a regular lighting fixture (82) equipped with AC equipment (82a) are respectively connected to different AC / DC power supply lines (L101, L102) from among the two or more AC / DC power supply lines (L1). The above-mentioned power supply system (1) can be configured as a shared circuit system in which the power supply circuit for lighting uses the same AC / DC power supply circuit (L11) for both disaster prevention lighting fixtures (81) and regular lighting fixtures (82).
[0134] A lighting fixture (81A, 80A~80C) of the tenth embodiment comprises a DC equipment protection device (2) of the first or second embodiment, a DC power supply circuit (L2), and a DC equipment (81a). The DC equipment (81a) has a lighting circuit (811) that converts DC power to load power, and a light source (812) that lights up with the load power.
[0135] The aforementioned lighting fixtures (81A, 80A~80C) can achieve both operation and protection of the DC equipment (81a) in the disaster prevention lighting fixture (81) by using an AC / DC power supply circuit (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 breaker 42a Main circuit breaker (switching device) 42b Branch circuit breaker (switching device) 81. Emergency lighting fixtures 81A, 80A~80C Emergency Lighting Fixtures (Lighting Fixtures) 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 circuit that transmits power supplied from one of several external power sources, including at least one AC power source and at least one DC power source, DC equipment and AC equipment and An AC circuit breaker that switches between continuity and interruption of a DC connection circuit between a DC power supply circuit that supplies the power to the DC equipment and the AC / DC power supply circuit, The system includes a DC interruption unit that switches between the conduction and interruption of the AC connection circuit between the AC power supply circuit that supplies the power to the AC equipment and the AC / DC power supply circuit, The AC interruption unit is, If the supplied power is DC power, the DC connection circuit is opened to conduction. If the supplied power is AC power, the DC connection circuit is interrupted. The DC interruption unit is If the supplied power is AC power, the AC connection circuit is opened to conduction. If the supplied power is DC power, the AC connection circuit is interrupted. The aforementioned DC equipment is A first lighting circuit that converts the aforementioned DC power into a first load power, It comprises a first light source that is lit by the first load power supplied from the first lighting circuit, The aforementioned AC equipment is A second lighting circuit that converts the aforementioned AC power into a second load power, A second light source that is illuminated by the second load power supplied from the second lighting circuit, Lighting fixtures.
2. Disaster prevention lighting fixtures including the aforementioned DC equipment, The regular lighting fixture includes the aforementioned AC equipment, and further comprises The aforementioned regular lighting fixture lights up when the AC power supply is energized. The aforementioned disaster prevention lighting fixture lights up when the AC power supply is interrupted. The lighting fixture according to claim 1.
3. The AC interruption unit and the DC interruption unit are connected to one of the AC / DC power supply circuits. A lighting fixture according to claim 1 or 2.