JP2012075032A - Output circuit and output device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an output circuit not requiring necessity of replacing a circuit board when changing its output terminal to a sink type or a source type, as well as capable of preventing breakage of a switching element when a power source is erroneously connected to the output terminal, and to provide an output device with the output circuit.SOLUTION: When selecting a source-type output corresponding mode by a DIP switch 81, an output to external devices is on/off controlled by an on/off control of a first switching element 31, with a second switching element 32 always in an on-state. When selecting a sink-type output corresponding mode by the DIP switch 81, an output to the external devices is on/off controlled by an on/off control of the second switching element 32, with the first switching element 31 always in an on-state. Furthermore, when the source-type output corresponding mode is selected, if an external power source is erroneously connected to the second output terminal 32, a large current flows to the second switching element 32, but a fuse 35 is immediately blown out.

Description

  The present invention relates to an output circuit that outputs a high potential (source type) signal or a low potential (sink type) signal to an external device, and an output device having the output circuit.

  Generally, a numerical control device of a machine tool includes an output circuit that outputs a signal to an external device such as a machining center or a lathe and an input circuit that inputs a signal from the external device. When the input / output signal of the external device is a source type signal, an input / output circuit corresponding to the source type is used for the numerical control device. On the other hand, when the input / output signal of the external device is a sink type signal, an input / output circuit corresponding to the sink type is used for the numerical control device. The operator replaces the input / output circuit of the numerical control device so that the input / output circuit type of the numerical control device matches the input / output signal type of the external device.

  Patent Document 1 discloses a numerical control device capable of exchanging an input / output circuit unit. The numerical control device includes a fixed substrate and a detachable substrate that can be attached to and detached from the fixed substrate. The fixed substrate includes a control unit. The detachable substrate includes a terminal block and a sink type or source type input / output circuit unit.

  The control unit of the fixed substrate is common to the sink type and source type input / output circuit units. Therefore, the numerical control device can cope with the input / output signals of the external device by exchanging the attachment / detachment substrate having the sink type input / output circuit unit and the attachment / detachment substrate having the source type input / output circuit unit. .

Japanese Patent No. 3700315

  However, the operator needs to prepare two types of desorption substrates in advance, which increases the manufacturing cost of the numerical control device. Further, when switching the detachable substrate to the sink type or the source type, replacement work is required, and switching to the sink type or the source type is not easy.

  In order to avoid replacement of the substrate, it is conceivable to switch the output terminal to the sink type or the source type by turning on / off the switching element. When connecting the external device to the output circuit, the worker needs to connect the external device and an output terminal corresponding to the external device. However, when the worker is unfamiliar with the connection work or when the worker misidentifies the correspondence between the output terminal and the external device, the worker must connect the external power supply to the sink type output terminal grounded by the switching element. May be connected.

  When an operator connects an external power source to the sink type output terminal with the switching element turned on, a large current flows through the switching element. When a current exceeding the capacity of the switching element flows, the switching element is damaged.

The present invention has been made in view of such circumstances. When the output terminal is switched to the sink type or the source type, there is no need to replace the substrate, and the switching element can be connected even if the power supply is mistakenly connected to the output terminal. It is an object of the present invention to provide an output circuit that can prevent damage to the device and an output device including the output circuit.

  An output circuit according to the present invention is an output circuit that outputs a signal from either a source-type first output terminal or a sink-type second output terminal, and selects the first output terminal or the second output terminal. A selector; a first switching element connected between the first output terminal and the power supply side line; a second switching element and a fuse connected in series between the second output terminal and the ground side line; When the first output terminal is selected by the selection unit, the second switching element is turned on, and when the second output terminal is selected, the first switching element is turned on. It is made to do so.

  In the present invention, when the first output terminal is selected by the selection unit, the second switching element is turned on, and the output to the external device is turned on / off by turning on / off the first switching element. If an external power supply is mistakenly connected to the second output terminal, a large current flows through the second switching element, but the fuse is immediately cut to prevent the second switching element from being damaged. Further, when the second output state is selected by the selection unit, the first switching element is turned on, and the output to the external device is turned on / off by turning on / off the second switching element.

  An output circuit according to the present invention includes a first voltage dividing circuit connected in series between a power supply side line and a ground side line, a third switching element that controls connection of the first voltage dividing circuit and the ground side line, A second voltage dividing circuit connected in series between the power supply side line and the ground side line, and a fourth switching element for controlling connection between the second voltage dividing circuit and the power supply side line, and the first switching element The second voltage divider circuit is turned on based on the output of the first voltage divider circuit generated by the control of the third switching element, and the output of the second voltage divider circuit generated by the control of the fourth switching element. It is characterized by being turned on based on.

  In the present invention, the output of the first voltage dividing circuit is controlled by controlling the third switching element, and the on / off of the first switching element is controlled. Further, the output of the second voltage dividing circuit is controlled by controlling the fourth switching element, and on / off of the second switching element is controlled.

  The output circuit according to the present invention is characterized in that it has a port for inputting a signal from the second output terminal and includes a control device for controlling operations of the first switching element and the second switching element.

  In the present invention, when the first output terminal is selected by the selector and the fuse is not cut, the second output terminal is grounded via the second switching element and the fuse. Therefore, a low level signal “L” is input from the second output terminal to the port of the control device. When an external power supply is accidentally connected to the second output terminal, the fuse is cut and the ground of the second output terminal is released. Therefore, a high-level signal “H” is input from the external power supply to the port of the control device.

  The output circuit according to the present invention is characterized in that the fuse is replaceable.

  In the present invention, the output circuit is restored by replacing the blown fuse.

  In the output circuit according to the present invention, the first switching element and the second switching element are FETs.

  In the present invention, switching of the terminal to the sink type or the source type is realized by using an FET (Field-Effect Transistor) for the first switching element and the second switching element.

  An output device according to the present invention includes an output circuit according to any one of claims 1 to 5, a source-type third output terminal, a sink-type fourth output terminal, the third output terminal, Selection means for selecting four output terminals, a fifth switching element connected between the third output terminal and the power supply side line, and a sixth switching element connected between the fourth output terminal and the fuse. And when the third output terminal is selected by the selection means, the fifth switching element is turned on, and when the fourth output terminal is selected, the sixth switching element is turned on. And another output circuit.

  In the present invention, when a plurality of output circuits are used, the sixth switching element of another output circuit is connected to the fuse of one output circuit.

  In the output circuit according to the present invention, when the selection unit selects the first output terminal, the second switching element is turned on, and the output to the external device is turned on by turning on / off the first switching element. /Turn off. When an external power supply is mistakenly connected to the second output terminal, a large current flows through the second switching element, but the fuse is immediately cut off, and damage to the second switching element can be prevented. Further, when the second output state is selected by the selection unit, the first switching element is turned on, and the output to the external device is turned on / off by turning on / off the second switching element. Therefore, when the output terminal is switched to the sink type or the source type, it is not necessary to replace the substrate.

  In the output circuit according to the present invention, the output of the first voltage dividing circuit is controlled by the control of the third switching element, and the on / off of the first switching element is controlled. Further, the output of the second voltage dividing circuit is controlled by controlling the fourth switching element, and on / off of the second switching element is controlled. Generally, the operating voltage differs between an external device and a numerical control device that controls the external device. Therefore, based on the voltage signal from the numerical control device, the operation of the third switching element and the fourth switching element is controlled, the first switching element and the second switching element are turned on / off, and the voltage signal is sent to the external device. Output. That is, the voltage output from the numerical control device can be converted into a voltage corresponding to the external device.

  In the output circuit according to the present invention, the fuse is cut when the first output terminal is selected by the selection unit and an external power supply is accidentally connected to the second output terminal. Before the fuse is cut, the second output terminal is grounded, and a low level signal “L” is input to the control device. After the fuse is cut, the ground of the second output terminal is released, and a high level signal “H” is input to the control device. Since the input signal from the second output terminal changes from “L” to “H” by cutting the fuse, the control device can detect that an excessive current flows in the second switching element.

  In the output circuit according to the present invention, the output circuit can be quickly recovered by replacing the blown fuse.

  In the output circuit according to the present invention, by using the FET as the first switching element and the second switching element, switching of the output terminal to the sink type or the source type can be reliably realized.

In the output device according to the present invention, when a plurality of output circuits are used, the fuses of one output circuit can be connected to the sixth switching element of another output circuit to reduce the number of fuses. Further, when an excessive current flows through the second switching element or the sixth switching element, the fuse is cut, and the second switching element and the sixth switching element can be protected by one fuse.

FIG. 3 is a circuit diagram illustrating an output circuit according to the first embodiment. It is a figure which shows the state of the dip switch in each mode. FIG. 6 is a circuit diagram when an external power supply is mistakenly connected to a second output terminal in the source type output correspondence mode. FIG. 6 is a circuit diagram illustrating an output device according to a second embodiment.

(Embodiment 1)
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an output circuit according to a first embodiment. FIG. 1 is a circuit diagram showing an output circuit according to the first embodiment, and FIG. 2 is a diagram showing a state of a dip switch in each mode. In the figure, the dip switch is indicated as dip SW.

  The output circuit 1 is provided in a numerical control device of a machine tool and is mounted on a substrate (not shown). The output circuit 1 includes a control device 10, a first output terminal 21, a second output terminal 22, a terminal block 80, and a dip switch 81 (selection unit). An external device is connected to the first output terminal 21 and the second output terminal 22. The external device operates with a 24V signal.

  The control device 10 includes, for example, an FPGA (Field Programmable Gate Arrey), an ASIC (Application Specific Integrated Circuit), or a microcomputer. The control device 10 includes two output ports 10a and 10b and an input port 10c. Further, the control device 10 controls the driving of the FET described later based on the selection by the dip switch 81. The control device 10 operates at 3.3V.

  A p-type MOSFET 31 (first switching element, hereinafter referred to as FET 31) is connected between the first output terminal 21 and a 24 V power supply (power supply side line) 91. The source of the FET 31 is connected to the power supply 91, and the drain of the FET 31 is connected to the first output terminal 21. The power supply 91 is configured to protect the FET 31 from excessive current.

  A resistor 41 is connected between the gate of the FET 31 and the power supply 91, and the gate of the FET 31 is connected to the collector of the NPN transistor 51 (third switching element) via the resistor 42. The emitter of the transistor 51 is grounded, and the base of the transistor 51 is connected to the output port 10 a of the control device 10 via the resistor 52. The base and emitter of the transistor 51 are connected via a resistor 53. The resistor 41 and the resistor 42 constitute a first voltage dividing circuit.

  An n-type MOSFET 32 (second switching element, hereinafter referred to as FET 32) and a fuse 35 are connected in series between the second output terminal 22 and the ground line. The drain of the FET 32 is connected to the second output terminal 22, and the source of the FET 32 is grounded via the fuse 35. The source of the FET 32 is connected to the input port 10c of the control device 10 via a conversion circuit 82 that converts the voltage. The conversion circuit 82 converts an input signal (for example, a 24V signal) into a 3.3V signal corresponding to the control device 10.

The gate of the FET 32 is connected to one end of the fuse 35 through a resistor 43. The other end of the fuse 35 is grounded. The fuse 35 is configured to be cut with a current sufficiently smaller than a reference current (hereinafter referred to as a rated current) for preventing the FET 32 from being damaged. The fuse 35 can be replaced. The gate of the FET 32 is connected to the collector of the transistor 61 (fourth switching element) via the resistor 44. The emitter of the transistor 61 is connected to a 24V power source 92. The base and emitter of the transistor 61 are connected via a resistor 63. The resistors 43 and 44 constitute a second voltage dividing circuit.

  The base of the transistor 61 is connected to the collector of the transistor 71 via the resistor 62. The emitter of the transistor 71 is grounded. The base of the transistor 71 is connected to the output port 10 b of the control device 10 via the resistor 72. The base and emitter of the transistor 71 are connected via a resistor 73.

  The terminal block 80 includes a plurality of ports, and the first output terminal 21 and the second output terminal 22 are arranged in each port. A diode that allows current to pass from the second output terminal 22 to the first output terminal 21 and absorbs overcurrent may be connected between the first output terminal 21 and the second output terminal 22.

  The dip switch 81 can select a source type output compatible mode or a sink type output compatible mode. The source-type output corresponding mode refers to a state in which a high potential signal “H” can be output from the first output terminal 21 to an external device. The source-type output corresponding mode refers to a state in which a low potential signal “L” can be output from the second output terminal 22 to an external device. As shown in FIG. 2A, when the operator turns on the dip switch 81, the output circuit 1 enters the source type output correspondence mode. When the dip switch 81 is set to OFF, the output circuit 1 enters the sink type output compatible mode.

  Next, the operation of the output circuit 1 in the source type output support mode will be described. In the case of the source type output support mode, the control device 10 always outputs a signal “H” from the output port 10 b to the resistor 72. A signal “H” is input to the base of the transistor 71 via the resistor 72 to turn on the base. The output port 10b outputs a voltage signal of 3.3V.

  When the transistor 71 is turned on, the resistor 62 is grounded. The base of the transistor 61 is pulled down to 0V via the resistor 62, turning on the transistor 61. When the transistor 61 is turned on, the voltage of the power source 92 is divided by the resistor 44 and the resistor 43, and the signal “H” is input to the gate of the FET 32. The second output terminal 22 is grounded, and a low level signal “L” (0 V signal) is constantly output from the second output terminal 22. That is, the second output terminal 22 functions as a terminal (ground) for supplying 0 V (see FIG. 2B). Further, the signal “L” is input from the second output terminal 22 to the input port 10 c of the control device 10 via the conversion circuit 82.

  When the signal “H” is output from the output port 10 a to the resistor 52, the signal “H” is input to the base of the transistor 51 via the resistor 52, and the transistor 51 is turned on. The output port 10a outputs a 3.3V voltage signal.

  When the transistor 51 is turned on, the resistor 42 is grounded. The gate of the FET 31 is pulled down via the resistor 42 to turn on the FET 31. The first output terminal 21 is connected to the power supply 91 by turning on the FET 31. A signal “H” of 24 V is output from the first output terminal 21.

On the other hand, when the signal “L” is output from the output port 10 a to the resistor 52, the signal “L” is input to the base of the transistor 51 via the resistor 52 and the transistor 51 is turned off.
When the transistor 51 is turned off, the grounding of the resistor 42 is released. The gate of the FET 31 is pulled up to 24 V (the potential of the power supply 91) via the resistor 41, and the FET 31 is turned off. The first output terminal 21 is in a high impedance state. The control device 10 performs on / off control of the FET 31, and the first output terminal 21 functions as a source-type output terminal that outputs a signal “H”.

  Next, the operation of the output circuit 1 in the sink type output support mode will be described. In the case of the sink type output compatible mode, the control device 10 always outputs the signal “H” from the output port 10 a to the resistor 72. As described above, the control device 10 turns on the FET 31 from the output port 10 a and connects the first output terminal 21 to the power supply 91. The signal “H” is constantly output from the first output terminal 21, and the first output terminal 21 functions as a terminal for supplying 24V (see FIG. 2B).

  As described above, the control device 10 turns on the FET 32 from the output port 10 b, grounds the second output terminal 22, and outputs a signal “L” from the second output terminal 22. On the other hand, the control device 10 outputs a signal “L” from the output port 10 b to the resistor 72 to turn off the transistor 71.

  When the transistor 71 is turned off, the ground of the resistor 62 is released, and the base of the transistor 61 is pulled up via the resistor 63 and turned off. The connection between the power source 92 and the resistor 44 is released, and the gate of the FET 32 is pulled down to 0 V via the resistor 43, thereby turning off the FET 32. The second output terminal 22 is in a high impedance state. The control device 10 controls on / off of the FET 32, and the second output terminal 22 functions as a sink-type output terminal that outputs a signal “L”.

  Next, a case where an external power supply is mistakenly connected to the second output terminal 22 in the source type output correspondence mode will be described. FIG. 3 is a circuit diagram when an external power supply is mistakenly connected to the second output terminal 22 in the source-type output support mode.

  As described above, the FET 32 is turned on in the source type output correspondence mode, and the second output terminal 22 is grounded via the FET 32 and the fuse 35. Further, the signal “L” is input from the second output terminal 22 to the input port 10 c. As shown in FIG. 3, when an operator accidentally connects the external power supply 5 to the second output terminal 22, a large current flows from the second output terminal 22 to the FET 32 and the fuse 35 (see white arrows in FIG. 3). ). The fuse 35 is cut with a current sufficiently smaller than the rated current of the FET 32. Therefore, when a current larger than the rated current flows from the second output terminal 22 to the FET 32, as shown in FIG. 3, the fuse 35 is immediately cut and the FET 32 is not damaged.

  By cutting the fuse 35, the potential of the second output terminal 22 rises, and the signal “H” is input from the second output terminal 22 to the input port 10 c via the conversion circuit 82. When the signal “H” is input from the second output terminal 22, the control device 10 detects that the fuse 35 is cut, in other words, that an excessive current flows through the FET 32. When the control device 10 detects the disconnection of the fuse 35, the control device 10 can prompt the operator to replace the fuse 35 by operating a notification means such as a lamp or a buzzer. The conversion circuit 82 converts the voltage of the external power supply 5 input from the second output terminal 22 into a 3.3V signal (voltage).

  In the sink-type output support mode, when the first output terminal 21 is grounded, a large current flows through the FET 31, but as described above, the power supply 91 is configured to protect the FET 31 from an excessive current. . For example, the power supply 91 includes an IPD (Intelligent Power Device), and when a current larger than the rated current flows through the FET 31, the supply of current to the FET 31 is immediately cut off.

  In the output circuit according to the first embodiment, when the source type output correspondence mode is selected by the dip switch 81, the second switching element 32 is turned on, and the first switching element 31 is turned on / off by the on / off control. Controls output to external devices. When an external power supply is mistakenly connected to the second output terminal 22, a large current flows through the second switching element 32, but the fuse 35 is immediately cut, and damage to the second switching element 32 can be prevented. Further, it is possible to switch to the source type output compatible mode and the sink type output compatible mode without replacing the substrate. Moreover, the output voltage of the control apparatus 10 can be converted into the operating voltage of an external device.

  The fuse 22 may be fixed to the substrate. In this case, the fuse 22 is replaced by replacing the substrate. Further, the operating voltage of the control device 10 is a 3.3V system, and the operating voltage of the external device is a 24V system, but is not limited thereto. It is only necessary that the operating voltage of the control device 10 and the operating voltage of the external device are appropriately converted. Further, the dip switch 81 is used to select the source type output compatible mode or the sink type output compatible mode. However, instead of the dip switch 81, other switches such as a button type switch and a toggle type switch may be used. good. Moreover, although FET or a transistor is used as a switching element, you may use IGBT (Insulated Gate Bipolar transistor) and other switching elements.

(Embodiment 2)
Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an output device according to a second embodiment. FIG. 4 is a circuit diagram showing the output device.

    The output device 100 includes an output circuit 1 (one output circuit) and an output circuit 2 (another output circuit). The output circuit 2 includes a control device 10, a third output terminal 23, a fourth output terminal 24, a terminal block 83, and a dip switch 81 (selection unit and selection means). An external device is connected to the third output terminal 23 and the fourth output terminal 24. The external device operates with a 24V signal.

  The control device 10 includes output ports 10d and 10e. Further, the control device 10 controls the driving of the FET described later based on the selection by the dip switch 81.

  The third output terminal 23 is connected to the drain of a p-type MOSFET 33 (fifth switching element, hereinafter referred to as FET 33). The source of the FET 33 is connected to a 24V power source 93. The gate of the FET 33 is connected to the power supply 93 through the resistor 141 and is connected to the collector of the NPN transistor 151 through the resistor 142. The power supply 93 is configured to protect the FET 33 from excessive current. The emitter of the transistor 151 is grounded. The base of the transistor 151 is connected to the output port 10 d of the control device 10 through the resistor 152. The base and emitter of the transistor 151 are connected via a resistor 153.

  The fourth output terminal 24 is connected to the drain of an n-type MOSFET 34 (sixth switching element, hereinafter referred to as FET 34). The source of the FET 34 is grounded via the fuse 35 of the output circuit 1, and is connected to the input port 10 c via the conversion circuit 82. The gate of the FET 34 is connected to the fuse 35 via the resistor 143. The gate of the FET 34 is connected to the collector of the NPN transistor 161 via the resistor 144.

The emitter of the transistor 161 is connected to a 24V power supply 94. The base and emitter of the transistor 161 are connected via a resistor 163. The base of the transistor 161 is connected to the collector of the NPN transistor 171 through the resistor 162. The emitter of the transistor 171 is grounded. The base of the transistor 171 is connected to the output port 10e via the resistor 172. The base and emitter of the transistor 171 are connected via a resistor 173.

  The terminal block 83 has a plurality of ports, and the third output terminal 23 and the fourth output terminal 24 are arranged in each port. A diode that passes current from the fourth output terminal 24 to the third output terminal 23 and absorbs overcurrent may be connected between the third output terminal 23 and the fourth output terminal 24.

  The dip switch 81 can select a source type output compatible mode or a sink type output compatible mode. When the source type output support mode is selected, a high level signal “H” can be output from the control device 10 to the external device via the third output terminal 23. When the sink type output support mode is selected, a low level signal “L” can be output from the control device 10 to the external device via the fourth output terminal 24.

  The operation of the output circuit 2 based on the selection by the DIP switch 81 is the same as that of the output circuit 1 according to the first embodiment, and detailed description thereof is omitted.

  If the external power supply is mistakenly connected to the second output terminal 22 or the fourth output terminal 24 with the source type output corresponding mode selected by the DIP switch 81, the fuse 35 is cut. Before the fuse 35 is cut, the signal “L” is input from the second output terminal 22 to the input port 10 c. After the fuse 35 is cut, the signal “H” is input from the second output terminal 22 or the fourth output terminal 24 to the input port 10 c via the conversion circuit 82. When the signal “H” is input from the second output terminal 22 or the fourth output terminal 24, the control device 10 detects that the fuse 35 is cut, in other words, that an excessive current flows through the FET 32 or the FET 34. .

  In the output device 100 according to the second embodiment, since the source of the FET 34 is grounded via the fuse 35 of the output circuit 1, the output circuit 2 can reduce the number of fuses. When an excessive current flows through the FET 32 or the FET 34, the fuse 35 is cut, and the FET 32 and the FET 34 can be protected by the single fuse 35. Further, the signals at the second output terminal 22 and the fourth output terminal 24 can be monitored to detect that an excessive current has flown through the FET 32 or the FET 34.

  Note that the output device 100 may include a plurality of output circuits 2. In this case, the source of the FET 34 of each output circuit 2 is grounded via the fuse 35.

  The embodiment described above is an exemplification of the present invention, and the present invention can be implemented in various modified forms within the scope defined by the matters described in the claims and the description of the claims. it can.

1 Output circuit (One output circuit)
2 Output circuit (other output circuits)
21 1st output terminal 22 2nd output terminal 23 3rd output terminal 24 4th output terminal 31 FET (1st switching element)
32 FET (second switching element)
33 FET (5th switching element)
34 FET (6th switching element)
35 Fuse 41, 42 Resistor (first voltage divider)
141, 142 Resistor 43, 44 Resistor (second voltage dividing circuit)
143, 144 Resistance 51, 151 Transistor (3rd switching element)
61, 161 transistor (fourth switching element)
81 DIP switch (selection unit, selection means)
100 output device

Claims (6)

An output circuit that outputs a signal from either a source-type first output terminal or a sink-type second output terminal,
A selector for selecting the first output terminal or the second output terminal;
A first switching element connected between the first output terminal and a power supply line;
A second switching element and a fuse connected in series between the second output terminal and the ground side line;
When the selection unit selects the first output terminal, the second switching element is turned on, and when the second output terminal is selected, the first switching element is turned on. An output circuit characterized by being. A first voltage dividing circuit connected in series between the power supply side line and the ground side line, and a third switching element for controlling connection of the first voltage dividing circuit and the ground side line;
A second voltage dividing circuit connected in series between the power supply side line and the ground side line, and a fourth switching element for controlling the connection of the second voltage dividing circuit and the power supply side line,
The first switching element is turned on based on the output of the first voltage dividing circuit generated by the control of the third switching element, and the second switching element is generated by the control of the fourth switching element. The output circuit according to claim 1, wherein the output circuit is turned on based on an output of the half-voltage divider circuit.   3. The output circuit according to claim 1, further comprising a control device that has a port for inputting a signal from the second output terminal and controls operations of the first switching element and the second switching element.   4. The output circuit according to claim 1, wherein the fuse is replaceable.   The output circuit according to claim 1, wherein the first switching element and the second switching element are FETs. One output circuit according to any one of claims 1 to 5;
A source-type third output terminal;
A sink type fourth output terminal,
Selecting means for selecting the third output terminal or the fourth output terminal;
A fifth switching element connected between the third output terminal and the power supply side line; and a sixth switching element connected between the fourth output terminal and the fuse;
When the third output terminal is selected by the selection means, the fifth switching element is turned on, and when the fourth output terminal is selected, the sixth switching element is turned on. An output device comprising: another output circuit.

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