Power supply

Abstract

To allow a user to select a specification of power, from multiple power specifications, which is to be input to a relay unit from an external power supply, and prevent a device supplied with power from the relay unit from being damaged.SOLUTION: A power supply apparatus (50) includes a first relay unit (63) which relays and outputs power, the power having one type of power specification being allowed to be input from an external power supply (21); and a second relay unit (73) which relays and outputs power, the power being input from an external power supply (26) and having a specification selected from multiple specifications, the power supply apparatus being connected to predetermined devices (30, 40) which operate with power supplied from the first relay unit and have a predetermined specification of power supplied from the second relay unit. The power supply apparatus includes: an information acquisition unit (65) which acquires information including the predetermined specification from the predetermined devices that operate with power from the first relay unit; and power control units (65, 80) configured to cause the second relay unit to supply power to the predetermined devices on condition that the specification of the power input to the second relay unit corresponds to the predetermined specification.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a power supply device including a relay unit that relays and outputs power input from an external power supply. [Background technology]

[0002] Conventionally, among power supply devices of this type, there is a power supply device that outputs power from a relay unit via a bus connector and supplies the power to a plurality of devices from a bus line connected to the bus connector (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2006-294007 A Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, a power supply device is considered that includes a first relay unit in which the specification of the power input from the external power source is determined to be one specification (e.g., DC power) and a second relay unit in which the specification of the power input from the external power source is selectable from a plurality of specifications (e.g., DC power and AC power). With such a configuration, a user can select the specification of the power input from the external power source to the second relay unit, and connect a device corresponding to the selected specification of the power to the second relay unit.

[0005] However, if the specifications of the power input from the external power source to the second relay unit do not correspond to the power specifications expected by the device connected to the second relay unit, there is a risk of damage to the device to which power is supplied via the second relay unit.

[0006] The present invention has been made to solve the above-mentioned problems, and its main object is to enable a power supply device to select from multiple specifications for the specifications of the power input from an external power source to a relay unit, while preventing damage to the device to which power is supplied from the relay unit. [Means for solving the problem]

[0007] The first means for solving the above problem is A first relay unit that relays and outputs the input power, the specification of which is determined to be one specification for the power input from the external power source; a second relay unit that selects a specification of the power input from the external power source from a plurality of specifications and relays and outputs the input power, A power supply device to which a specific device is connected, the specific device being operated by the power supplied from the first relay unit and the specification of the power supplied from the second relay unit being determined to be a specific specification, an information acquisition unit that acquires information including the predetermined specifications from the predetermined device operated by the power supplied from the first relay unit; a power control unit that supplies power from the second relay unit to the predetermined device on the condition that the specifications of the power input to the second relay unit correspond to the predetermined specifications included in the information acquired by the information acquisition unit; and Equipped with.

[0008] According to the above configuration, the power supply device includes a first relay unit and a second relay unit, and is connected to a predetermined device whose specifications for the power supplied from the second relay unit are determined to be predetermined specifications. The first relay unit has one specification for the power input from the external power source, and relays and outputs the input power. The second relay unit has a specification for the power input from the external power source selected from a plurality of specifications, and relays and outputs the input power. Therefore, a user can select the specification for the power input from the external power source to the second relay unit, and connect a predetermined device corresponding to the selected power specification to the second relay unit.

[0009] Here, since the first relay unit has one set of specifications for the power input from the external power source, it is unlikely that a user will mistake the specifications of the power input to the first relay unit, and the specified device can be safely operated by the power supplied from the first relay unit. Therefore, the information acquisition unit can acquire information including the specified specifications from the specified device that has been safely operated by the power supplied from the first relay unit.

[0010] The power control unit supplies power from the second relay unit to the specified device on the condition that the specifications of the power input to the second relay unit correspond to the specified specifications included in the information acquired by the information acquisition unit. That is, when the specifications of the power input to the second relay unit correspond to the specified specifications included in the information, the power control unit supplies power from the second relay unit to the specified device. Therefore, the specified device can safely execute processing using the power supplied from the second relay unit. On the other hand, when the specifications of the power input to the second relay unit do not correspond to the specified specifications included in the information, the power control unit does not supply power from the second relay unit to the specified device. Therefore, it is possible to suppress damage to the specified device to which power is supplied from the second relay unit.

[0011] In general, when the predetermined device is operated by the power supplied from the first relay section, communication between the power supply device and the predetermined device connected to the power supply device becomes possible.

[0012] In this regard, in the second aspect, the information acquisition unit acquires the information by communicating with the specified device operated by the power supplied from the first relay unit. With this configuration, the information acquisition unit of the power supply device can easily acquire the information by communicating with the specified device.

[0013] In a third aspect, based on the first or second aspect, the specification of the power input from the external power source to the second relay unit is selected from DC power and AC power having a voltage higher than that of the DC power. With this configuration, even if AC power having a voltage higher than that of the DC power is erroneously input from the second relay unit to a specified device that is specified to receive DC power, damage to the specified device can be suppressed.

[0014] Specifically, in the fourth means, when the voltage of the power input to the second relay unit is higher than a comparison voltage set based on the predetermined specifications included in the information acquired by the information acquisition unit, the power control unit prohibits the second relay unit from supplying power to the predetermined device. With this configuration, even if a voltage higher than the voltage of the predetermined specifications is mistakenly supplied to a predetermined device that is supposed to be supplied with a voltage of the predetermined specifications from the second relay unit, it is possible to prevent the predetermined device from being damaged.

[0015] Specifically, in a fifth aspect, when the specifications of the power input to the second relay unit are AC power and the specified specifications included in the information acquired by the information acquisition unit are DC power, the power control unit prohibits the second relay unit from supplying power to the specified device. With this configuration, even if AC power is mistakenly supplied to the specified device that is intended to receive DC power from the second relay unit, damage to the specified device can be suppressed.

[0016] Specifically, as in the sixth aspect, a configuration can be adopted in which the power input from the external power supply to the first relay unit is determined to be DC power. With this configuration, a predetermined device can be operated by the DC power supplied from the first relay unit.

[0017] Specifically, in the seventh aspect, the first relay unit outputs power via a first bus connector, and the second relay unit outputs power via a second bus connector. With this configuration, by connecting a first bus line to the first bus connector, it is possible to supply power from the first relay unit to a plurality of devices connected to the first bus line. Also, by connecting a second bus line to the second bus connector, it is possible to supply power from the second relay unit to a plurality of devices connected to the second bus line. [Brief description of the drawings]

[0018] [Figure 1] FIG. 2 is a schematic diagram showing a power supply device and its peripheral configuration. [Diagram 2] FIG. 4 is a circuit diagram showing a first circuit. [Diagram 3] FIG. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of a power supply device that is connected to a PLC (Programmable Logic Controller) and relays power input from an external power supply and outputs it to a module will be described with reference to the drawings. 1, the power supply device 50 is connected to the PLC 10, a first external power supply 21, a second external power supply 26, and a first module 30. Furthermore, the power supply device 50 is connected to the second module 40 via the first module 30.

[0020] As the power specifications corresponding to the power supply device 50, the specifications of the power input from the first external power source 21 (external power source) to the power supply device 50 are set to a voltage of DC 18 to 32 [V] and a maximum current of 10 [A]. The specifications of the power input from the second external power source 26 (external power source) to the power supply device 50 are set to a voltage of DC 18 to 32 [V] or AC 8 to 240 [V] and a maximum current of 10 [A].

[0021] The first module 30 and the second module 40 need to be connected as modules corresponding to the power specifications of the second external power source 26. For example, when the second external power source 26 inputs DC 18 to 32 V to the power supply device 50, DC modules corresponding to the DC voltage need to be connected as the first module 30 and the second module 40. Also, when the second external power source 26 inputs AC 8 to 240 V to the power supply device 50, AC modules corresponding to the AC voltage need to be connected as the first module 30 and the second module 40.

[0022] The PLC 10 includes a CPU 11, an Ethernet port 16a, and the like.

[0023] The power supply device 50 includes an Ethernet (wired local area connection) port 51a, bus lines 61a, 61b, 71a, 71b, relay units 63, 73, a communication control unit 65, a status display unit 75, a connection switching circuit 80, etc. The Ethernet port 51a is connected to an Ethernet port 16a of the PLC 10 via a connector 51b and a connector 16b. That is, the Ethernet port 16a of the PLC and the Ethernet port 51a of the power supply device 50 are connected.

[0024] The bus lines 61a, 61b, 71a, and 71b include a power supply line for supplying power and a communication line for transmitting and receiving signals. The first relay unit 63 and the second relay unit 73 include terminal connectors, wiring, switches, and the like. As described above, the specifications of the power input from the first external power source 21 in the first relay unit 63 are set to a voltage of DC 18 to 32 [V] (specification 1) and a maximum current of 10 [A]. That is, the power input from the first external power source 21 to the first relay unit 63 is set to DC power. The specifications of the power input from the second external power source 26 in the second relay unit 73 are set to a voltage of DC 18 to 32 [V] or AC 8 to 240 [V] (specification 2) and a maximum current of 10 [A]. That is, the specifications of the power input from the second external power source 26 to the second relay unit 73 are selected from a plurality of specifications. In detail, the specification of the power input from the second external power source 26 to the second relay unit 73 is selected from DC power and AC power having a voltage higher than that of the DC power. In the second relay unit 73, the terminal connection part is common to DC 18 to 32 [V] and AC 8 to 240 [V].

[0025] The power supply lines of the bus lines 61a, 61b are connected to the first external power supply 21 via a first relay unit 63. That is, the first relay unit 63 relays and outputs the power input from the first external power supply 21. The power supply lines and communication lines of the bus lines 61a, 61b are connected to a communication control unit 65 via the first relay unit 63.

[0026] The power supply lines of the bus lines 71a, 71b are connected to the second external power supply 26 via the second relay unit 73. That is, the second relay unit 73 relays and outputs the power input from the second external power supply 26. The power supply lines of the bus lines 71a, 71b are connected to the status display unit 75 via the second relay unit 73. The communication lines of the bus lines 71a, 71b are connected to the communication control unit 65 via the second relay unit 73.

[0027] The status display unit 75 includes an LED (indicator light), and turns on the LED based on a command from the communication control unit 65.

[0028] The communication control unit 65 includes a microcomputer, a communication unit, an input / output interface, etc. The communication control unit 65 operates with power supplied from the power line of the bus line 61a, and controls the relay units 63 and 73, the status display unit 75, and the connection switching circuit 80. The communication control unit 65 also executes various processes based on commands from the PLC 10.

[0029] The first module 30 (predetermined device) includes an input port 31, bus lines 32a, 32b, 33a, and 33b, a first circuit 35, and a second circuit 36. The bus lines 32a, 32b, 33a, and 33b include a power supply line for supplying power and a communication line for transmitting and receiving signals. The first module 30 operates with power supplied from the first relay unit 63, and communicates with the communication control unit 65 via the communication line, and also supplies power supplied from the second relay unit 73 to the connected device.

[0030] The power supply lines and communication lines of the bus lines 32a, 32b (first bus lines) are connected to the power supply lines and communication lines of the bus lines 61a, 61b of the power supply device 50 via the input port 31, the first bus connector 67b, and the first bus connector 67a of the power supply device 50, respectively. As a result, the first module 30 operates with power supplied from the first relay unit 63. The power supply lines and communication lines of the bus lines 33a, 33b (second bus lines) are connected to the power supply lines and communication lines of the bus lines 71a, 71b of the power supply device 50, respectively, via the input port 31, the second bus connector 77b, and the second bus connector 77a of the power supply device 50. The specifications of the power supplied from the second relay unit 73 to the first module 30 are set to a voltage of DC 18 to 32 [V] or AC 8 to 240 [V] (predetermined specifications).

[0031] 2, the first circuit 35 includes power lines 35a and 35b, a fuse 35c, a capacitor 35d, an avalanche diode 35e, and the like. The power line 35a constitutes a part of the power line of the bus line 32a. The power line 35a is supplied with a voltage MP+ from the first external power source 21 via a fuse 35c. The power line 35b constitutes a part of the power line of the bus line 32b. A capacitor 35d and an avalanche diode 35e are connected in parallel between the power lines 35a and 35b.

[0032] FIG. 3 shows the second circuit 36 ​​when the first module 30 is a DC module. The DC module is a module corresponding to the case where the second external power source 26 inputs DC 18 to 32 [V] to the second relay unit 73 of the power supply device 50. The second circuit 36 ​​includes power lines 36a, 36b, fuses 36c, 36d, a capacitor 36e, an avalanche diode 36f, and the like. The power line 36a constitutes a part of the power line of the bus line 33a. The voltage SA+ from the second external power source 26 is supplied to the power line 36a via the fuse 36c. The power line 36b constitutes a part of the power line of the bus line 33b. The power line 36b is provided with a fuse 36d. The capacitor 36e and the avalanche diode 36f are connected in parallel between the power lines 36a and 36b.

[0033] The second module 40 (predetermined device) has the same configuration as the first module 30. That is, the second module 40 has an input port 41, bus lines 42a, 42b, 43a, 43b, a first circuit 45, a second circuit 46, etc. The second module 40 operates with power supplied from the first relay unit 63 via the first module 30, and communicates with the communication control unit 65 via the communication line, and also supplies power supplied from the second relay unit 73 to the connected device, etc.

[0034] The power supply lines and communication lines of the bus lines 42a and 42b (first bus lines) are connected to the power supply lines and communication lines of the bus lines 32a and 32b of the first module 30, respectively, via the input port 41. As a result, the second module 40 operates with power supplied from the first relay unit 63 via the first module 30. The power supply lines of the bus lines 42a and 42b are connected to each other at the end 48. The power supply lines and communication lines of the bus lines 43a and 43b (second bus lines) are connected to the power supply lines and communication lines of the bus lines 33a and 33b of the first module 30, respectively, via the input port 41. The specifications of the power supplied to the second module 40 from the second relay unit 73 via the first module 30 are set to a voltage of DC 18 to 32 [V] or AC 8 to 240 [V] (predetermined specifications). The power supply lines of the bus lines 43a and 43b are connected to each other at the end 48.

[0035] When the second module 40 is a DC module, the second circuit 46 is the same circuit as the second circuit 36. When the second module 40 is an AC module, the second circuit 46 is a circuit compatible with AC 8 to 240 V. The AC module is a module compatible with the case where the second external power source 26 inputs AC 8 to 240 V to the second relay unit 73 of the power supply device 50.

[0036] For example, when AC120[V] is input to the second relay unit 73 of the power supply device 50, if the user mistakenly connects a DC module to the power supply device 50 as the first module 30, the following problem occurs. That is, the fuses 36c, 36d and the avalanche diode 36f of the second circuit 36 ​​shown in FIG. 3 assume that DC18-32[V] is input as the voltage SA+. Therefore, when AC120[V], which is a voltage higher than DC18-32[V], is input to the second circuit 36, the fuses 36c, 36d and the avalanche diode 36f may be damaged. In addition, an AC voltage may be applied to the first circuit 35 via the circuit in the first module 30, and the fuse 35c in FIG. 2 may be damaged.

[0037] Therefore, the power supply device 50 includes a connection switching circuit 80 that switches between a state in which the power input from the second external power supply 26 is supplied to the first module 30 and a state in which it is not supplied to the first module 30. As shown in Fig. 4, the connection switching circuit 80 includes a power supply line 81a, a P-channel MOSFET 82, resistors 83, 84, 86, 88, 89, 91, a transistor 85, a rectifier circuit 87, a comparator 90, a Vref IC 92, and the like.

[0038] The power supply line 81a constitutes a part of the power supply line of the bus line 71a. The power supply line 81a is supplied with a voltage SA+ from the second external power supply 26. The power supply line 81a is connected to the power supply line of the bus line 33a of the first module 30 via a MOSFET 82.

[0039] A source S of the MOSFET 82 is connected to the power supply line 81a. A drain D of the MOSFET 82 is connected to the power supply line of the bus line 33a. A gate G of the MOSFET 82 is connected to the power supply line 81a via a resistor 83. The gate G of the MOSFET 82 is connected to GND via a resistor 84 and a transistor 85.

[0040] A collector C of the transistor 85 is connected to a gate G of the MOSFET 82 via a resistor 84. An emitter E of the transistor 85 is connected to GND. A base B of the transistor 85 is connected to GND via a resistor 86.

[0041] An input side of the rectifier circuit 87 is connected to the power supply line 81a. The rectifier circuit 87 rectifies (converts) the input AC current into a DC current and outputs the DC current. An output side of the rectifier circuit 87 is connected to GND via resistors 88 and 89.

[0042] The connection point between resistor 88 and resistor 89 is connected to the inverting input terminal of a comparator 90. The non-inverting input terminal of comparator 90 is connected to GND via resistor 91. The connection point between the non-inverting input terminal of comparator 90 and resistor 91 is connected to the output terminal of IC 92 for Vref.

[0043] The Vref IC 92 outputs the comparison voltage Vref from the output terminal based on a command from the communication control unit 65. The communication control unit 65 (information acquisition unit) communicates with each of the modules 30, 40 operated by the power supplied from the first relay unit 63 via the communication lines of the bus lines 61a, 32a, 42a. Then, the communication control unit 65 acquires information including the power specifications of each of the modules 30, 40. The communication control unit 65 (power control unit) sets the comparison voltage Vref based on the power specifications of each of the modules 30, 40 included in the acquired information. When a DC module is connected to the power supply device 50 as the first module 30, the communication control unit 65 sets the comparison voltage Vref to a voltage slightly higher than the maximum value of the DC voltage input from the second external power source 26, for example, 35 [V]. When an AC module is connected to the power supply device 50 as the first module 30, the communication control unit 65 sets the comparison voltage Vref to a voltage slightly higher than the maximum value of the AC voltage input from the second external power source 26, for example, 260 V.

[0044] When the comparison voltage Vref input to the non-inverting input terminal is higher than the voltage input to the inverting input terminal, the comparator 90 outputs a voltage Vcc2 to the base B of the transistor 85. This causes the transistor 85 and the MOSFET 82 to turn on, and power is supplied from the power supply line 81a to the power supply line of the bus line 33a. On the other hand, when the comparison voltage Vref input to the non-inverting input terminal is lower than the voltage input to the inverting input terminal, the comparator 90 outputs 0 [V] to the base B of the transistor 85. This causes the transistor 85 and the MOSFET 82 to turn off, and the supply of power from the power supply line 81a to the power supply line of the bus line 33a is stopped (prohibited). That is, the communication control unit 65 and the comparator 90 cause the second relay unit 73 to supply power to the first module 30 and the second module 40 on the condition that the specifications of the power input to the second relay unit 73 correspond to the specifications of the power of each module 30, 40 included in the acquired information. The communication control unit 65 and the comparator 90 constitute a power control unit.

[0045] According to the power supply device 50 having the above configuration, when DC 18 to 32 [V] is input from the second external power supply 26 to the second relay unit 73 and the modules 30 and 40 are DC modules, the comparison voltage Vref input to the non-inverting input terminal becomes higher than the voltage input to the inverting input terminal. This causes the comparator 90 to output the voltage Vcc2 to the base B of the transistor 85, and power is supplied from the power supply line 81a to the power supply line of the bus line 33a of the first module 30. Furthermore, power is supplied from the power supply line of the bus line 33a to the power supply line of the bus line 43a of the second module 40.

[0046] On the other hand, when AC 120 [V] is input from the second external power source 26 to the second relay unit 73 and at least one of the modules 30 and 40 is a DC module, the comparison voltage Vref input to the non-inverting input terminal becomes lower than the voltage input to the inverting input terminal. This causes the comparator 90 to output 0 [V] to the base B of the transistor 85, and the supply of power from the power line 81a to the power line of the bus line 33a of the first module 30 is stopped (prohibited). As a result, the supply of power from the power line of the bus line 33a to the power line of the bus line 43a of the second module 40 is also stopped (prohibited).

[0047] Furthermore, when AC120 [V] is input from the second external power supply 26 to the second relay unit 73 and the modules 30, 40 are AC modules, the comparison voltage Vref input to the non-inverting input terminal becomes higher than the voltage input to the inverting input terminal. This causes the comparator 90 to output the voltage Vcc2 to the base B of the transistor 85, and power is supplied from the power supply line 81a to the power supply line of the bus line 33a of the first module 30. Furthermore, power is supplied from the power supply line of the bus line 33a to the power supply line of the bus line 43a of the second module 40.

[0048] In addition, when DC 18 to 32 [V] is input from the second external power source 26 to the second relay unit 73 and the modules 30, 40 are AC modules, the comparison voltage Vref input to the non-inverting input terminal becomes higher than the voltage input to the inverting input terminal. As a result, the voltage Vcc2 is output from the comparator 90 to the base B of the transistor 85, and power is supplied from the power supply line 81a to the power supply line of the bus line 33a of the first module 30. Furthermore, power is supplied from the power supply line of the bus line 33a to the power supply line of the bus line 43a of the second module 40. However, in this case, the first circuits 35, 45 and the second circuits 36, 46 of the AC module are circuits compatible with AC 8 to 240 [V], so there is no risk of the first circuits 35, 45 and the second circuits 36, 46 being damaged.

[0049] The present embodiment described above in detail has the following advantages.

[0050] The power supply device 50 includes a first relay unit 63 and a second relay unit 73, and is connected to modules 30, 40 whose specifications for the power supplied from the second relay unit 73 are set to predetermined specifications. The first relay unit 63 has one specification for the power input from the first external power source 21, and relays and outputs the input power. The second relay unit 73 has a specification for the power input from the second external power source 26 selected from a plurality of specifications, and relays and outputs the input power. For this reason, the user can select the specification for the power input from the second external power source 26 to the second relay unit 73, and connect the first module 30 corresponding to the selected power specification to the second relay unit 73.

[0051] Since the first relay unit 63 has one set specification for the power input from the first external power source 21, it is unlikely that the user will make a mistake in the specification of the power input to the first relay unit 63, and the modules 30, 40 can be safely operated by the power supplied from the first relay unit 63. Therefore, the communication control unit 65 can obtain information including the predetermined specifications from the modules 30, 40 that have been safely operated by the power supplied from the first relay unit 63.

[0052] The communication control unit 65 and the comparator 90 supply power from the second relay unit 73 to the modules 30 and 40 on the condition that the specifications of the power input to the second relay unit 73 correspond to the predetermined specifications included in the information acquired by the communication control unit 65. That is, when the specifications of the power input to the second relay unit 73 correspond to the predetermined specifications included in the information, the communication control unit 65 and the comparator 90 supply power from the second relay unit 73 to the modules 30 and 40. Therefore, the modules 30 and 40 can safely execute processing using the power supplied from the second relay unit 73. On the other hand, when the specifications of the power input to the second relay unit 73 do not correspond to the predetermined specifications included in the information, the communication control unit 65 and the comparator 90 do not supply power from the second relay unit 73 to the modules 30 and 40. Therefore, it is possible to suppress damage to the modules 30 and 40 to which power is supplied from the second relay unit 73.

[0053] The communication control unit 65 acquires information through communication with the modules 30, 40 that are activated by the power supplied from the first relay unit 63. With this configuration, the communication control unit 65 of the power supply device 50 can easily acquire information through communication with the modules 30, 40.

[0054] The specifications of the power input from the second external power source 26 to the second relay unit 73 are selected from DC power and AC power having a voltage higher than that of the DC power. With this configuration, even if AC power having a voltage higher than that of the DC power is mistakenly input from the second relay unit 73 to the modules 30, 40 that are designed to receive DC power, damage to the modules 30, 40 can be suppressed.

[0055] The communication control unit 65 and the comparator 90 prohibit the second relay unit 73 from supplying power to the modules 30, 40 when the voltage of the power input to the second relay unit 73 is higher than a comparison voltage Vref set based on predetermined specifications included in the information acquired by the communication control unit 65. With this configuration, even if a voltage higher than the voltage of the predetermined specifications is mistakenly supplied to the modules 30, 40 that are supposed to be supplied with a voltage of the predetermined specifications from the second relay unit 73, it is possible to prevent the modules 30, 40 from being damaged.

[0056] The power input from the first external power source 21 to the first relay unit 63 is set to DC power. With this configuration, the modules 30, 40 can be operated by the DC power supplied from the first relay unit 63.

[0057] The above embodiment can be modified as follows: The same parts as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted.

[0058] The communication control unit 65 is not limited to communicating with modules 30, 40 operated by power supplied from the first relay unit 63, but can also acquire information by inputting a voltage value (voltage level) set according to the power specifications of the modules 30, 40.

[0059] The power input from the first external power source 21 to the first relay unit 63 is set to AC power (one specification), and the modules 30, 40 may be operated by the AC power supplied from the first relay unit 63. Even in this case, since the specification of the power input from the first external power source 21 to the first relay unit 63 is set to one specification, it is unlikely that the user will make a mistake in the specification of the power input to the first relay unit 63, and the modules 30, 40 can be safely operated by the power supplied from the first relay unit 63.

[0060] The connection switching circuit 80 in Fig. 4 can also be modified as follows. That is, the comparator 90 and the Vref IC 92 can be omitted, and the communication control unit 65 (power control unit) can detect the voltage of the power input to the second relay unit 73 using a voltage sensor or the like, and control the transistor 85 based on a comparison between the detected voltage and a threshold value set based on predetermined specifications included in the acquired information.

[0061] The power control unit may prohibit the second relay unit 73 from supplying power to the modules 30, 40 when the specification of the power input to the second relay unit 73 is AC power and at least one of the power specifications (predetermined specifications) of the modules 30, 40 included in the information acquired by the communication control unit 65 is DC power. Whether the specification of the power input to the second relay unit 73 is DC power or AC power can be determined, for example, by detecting the voltage of the power input to the second relay unit 73 using a voltage sensor or the like. With this configuration, even if AC power is mistakenly supplied to the modules 30, 40 that are supposed to receive DC power from the second relay unit 73, damage to the modules 30, 40 can be suppressed. Furthermore, when the specifications of the power input to the second relay unit 73 are DC power and at least one of the power specifications (predetermined specifications) of each module 30, 40 included in the information acquired by the communication control unit 65 is AC power, the power control unit may prohibit the second relay unit 73 from supplying power to the modules 30, 40. With this configuration, even if the voltage of the DC power input to the second relay unit 73 is higher than the voltage of the AC power input to the second relay unit 73, damage to the modules 30, 40 can be suppressed.

[0062] A cut-off module can be provided between the first module 30 and the second module 40 to cut off the supply of power from the first module 30 to the second module 40 if the specifications of the power supplied from the first module 30 to the second module 40 do not correspond to the power specifications of the second module 40.

[0063] The PLC 10 may also include a built-in power supply unit 50 .

[0064] The above modifications may be implemented in combination. [Explanation of symbols]

[0065] 21...first external power supply (external power supply), 26...second external power supply (external power supply), 30...first module (specified device), 40...second module (specified device), 50...power supply device, 63...first relay section, 65...communication control section (information acquisition section), 73...second relay section, 80...connection switching circuit.

Claims

1. A first relay unit that relays and outputs the input power, the specification of which is determined to be one specification, from the external power supply; a second relay unit that selects a specification of the power input from the external power supply from a plurality of specifications and relays and outputs the input power, A power supply device to which a specific device is connected, the specific device being operated by the power supplied from the first relay unit and the specification of the power supplied from the second relay unit being determined to be a specific specification, an information acquisition unit that acquires information including the predetermined specifications from the predetermined device operated by the power supplied from the first relay unit; a power control unit that supplies power from the second relay unit to the predetermined device on the condition that the specifications of the power input to the second relay unit correspond to the predetermined specifications included in the information acquired by the information acquisition unit; and A power supply device comprising:

2. The power supply device according to claim 1 , wherein the information acquisition unit acquires the information through communication with the predetermined device that is operated by power supplied from the first relay unit.

3. 3 . The power supply device according to claim 1 , wherein a specification of the power input from the external power supply to the second relay unit is selected from DC power and AC power having a voltage higher than a voltage of the DC power.

4. The power supply device according to any one of claims 1 to 3, wherein the power control unit prohibits the second relay unit from supplying power to the specified device when the voltage of the power input to the second relay unit is higher than a comparison voltage set based on the specified specifications included in the information acquired by the information acquisition unit, and causes the second relay unit to supply power to the specified device when the voltage of the power input to the second relay unit is lower than the comparison voltage.

5. The power supply device according to any one of claims 1 to 3, wherein the power control unit prohibits the second relay unit from supplying power to the specified device when the specifications of the power input to the second relay unit are AC power and the specified specifications included in the information acquired by the information acquisition unit are DC power.

6. 6. The power supply device according to claim 1, wherein the power input from the external power supply to the first relay unit is determined to be DC power.

7. the first relay unit outputs power via a first bus connector; 7. The power supply device according to claim 1, wherein the second relay unit outputs power via a second bus connector.

Images