Control device, control method, and control system

Abstract

To provide a control device, a control method, and a control signal capable of disconnecting a DC power supply from a load when a fault occurs in a power connection unit or a power monitoring unit.SOLUTION: A control device 3 is configured to include a power supply connection unit 11 that connects a DC power supply 1 and a load 4 when a drive signal instructing the supply of DC power is received, and disconnects the DC power supply 1 from the load 4 when no drive signal is received, and a power monitoring unit 12 that outputs a periodic signal when DC power is supplied from the DC power supply 1 to the load 4, and outputs a signal indicating the power supply is fault when the power supply itself is fault. The control device 3 also includes a disconnection unit 13 that maintains the connection between the DC power supply 1 and the load 4 when the drive signal is applied to the power supply connection unit 11 and a periodic signal is output from the power monitoring unit 12, while disconnecting the connection between the DC power supply 1 and the load 4 when a periodic signal is output from the power monitoring unit 12, when no drive signal is applied to the power supply connection unit 11, or when a signal indicating the power supply itself is fault is output from the power monitoring unit 12.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a control device, a control method, and a control system. [Background technology]

[0002] There is a control system that controls the supply of power to a load. As an example of such a control system, Patent Document 1 discloses a control system including a detection unit that detects an ON fault in the relay contact connected between an AC power supply and a load if AC power is being supplied from the AC power supply to the load while the control unit controls the relay contact to be turned OFF. An ON fault is a fault in which the relay contact is always fixed in the ON state and does not switch to the OFF state. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-208922 Summary of the Invention [Problem to be solved by the invention]

[0004] In the control system disclosed in Patent Document 1, even when a DC power supply is used instead of an AC power supply, if DC power is supplied from the DC power supply to the load when the relay contact is controlled to be turned off, the detection unit can detect that the relay contact has an ON failure. However, if a failure occurs in the detection unit, such that the signal output from the detection unit is fixed to an ON signal indicating that DC power is being supplied from the DC power supply to the load when the relay contact is controlled to be ON, the signal output from the detection unit is fixed to an ON signal regardless of whether DC power is being supplied from the DC power supply to the load. The control system disclosed in Patent Document 1 has a problem in that it does not include technology for detecting the above-mentioned detection unit failure. As a result, when a failure occurs in the detection unit, it is not possible to disconnect the DC power supply from the load, and therefore it is not possible to ensure the integrity of the system.

[0005] The present disclosure has been made to solve the above-mentioned problems, and aims to obtain a control device that can disconnect the DC power supply from the load when a fault occurs in the power supply connection section or in the power monitoring section. [Means for solving the problem]

[0006] The control device according to the present disclosure includes a power supply connection unit that connects a DC power supply to a load when a drive signal instructing the supply of DC power is received and that disconnects the DC power supply from the load when the drive signal is not received, and a power monitoring unit that outputs a periodic signal when DC power is being supplied from the DC power supply to the load and outputs a signal indicating that the DC power supply is faulty when the DC power supply is faulty. The control device also includes a disconnection unit that maintains the connection between the DC power supply and the load when the drive signal is received from the power supply connection unit and the power monitoring unit outputs a periodic signal, and disconnects the DC power supply from the load when the drive signal is not received from the power supply connection unit and the power monitoring unit outputs a signal indicating that the DC power supply is faulty. [Effects of the Invention]

[0007] According to the present disclosure, when a failure occurs in the power supply connection unit or in the power monitoring unit, the DC power supply and the load can be disconnected. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a configuration diagram showing a control system including a control device 3 according to a first embodiment. [Figure 2] 2 is a hardware configuration diagram showing hardware of a control device 3 according to the first embodiment. FIG. [Figure 3] FIG. 10 is a hardware configuration diagram of a computer in the case where the control device 3 is realized by software, firmware, or the like. [Figure 4] 3 is a circuit diagram showing an example of the power monitoring circuit 22 shown in FIG. 2. FIG. [Figure 5] 4 is a flowchart showing a control method, which is a processing procedure of the control device 3. [Figure 6] 2 is an explanatory diagram showing the DC voltage applied to the load 4, the voltage applied to the positive input terminal of the operational amplifier 22h, and the periodic signal output from the power monitoring unit 12. FIG. [Figure 7] 4 is an explanatory diagram showing the determination result of the interrupter 13 and the operation of the interrupter 13. FIG. [Figure 8] 10 is a circuit diagram showing an example of a power monitoring circuit 22 included in a control device 3 of a control system according to a second embodiment. FIG. [Figure 9] FIG. 10 is a configuration diagram showing a control system in which a breaker unit 13 has a built-in power monitoring unit 12. [Figure 10] FIG. 1 is a configuration diagram showing a control system in which breaker units 13 each having a built-in power monitoring unit 12 are multiplexed. DETAILED DESCRIPTION OF THE INVENTION

[0009] In order to explain the present disclosure in more detail, embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0010] Embodiment 1 FIG. 1 is a configuration diagram showing a control system including a control device 3 according to the first embodiment. FIG. 2 is a hardware configuration diagram showing the hardware of the control device 3 according to the first embodiment. The control system shown in FIG. 1 includes a DC power supply 1, a drive signal output unit 2, a control device 3, and a load 4. The DC power supply 1 is a power supply for outputting DC power to a load 4 . The drive signal output unit 2 outputs to the control device 3 a drive signal that instructs the supply of DC power.

[0011] The control device 3 includes a power supply connection unit 11, a power monitoring unit 12, and a cutoff unit 13. The load 4 is a DC load driven by DC power, such as a fuel load. 1, the drive signal output unit 2 is provided outside the control device 3. However, this is merely an example, and the drive signal output unit 2 may be provided inside the control device 3.

[0012] The power supply connection section 11 is connected by, for example, a power supply connection circuit 21 shown in FIG. The power supply connection unit 11 connects the DC power supply 1 and the load 4 when a drive signal is given from the drive signal output unit 2, and disconnects the DC power supply 1 and the load 4 when no drive signal is given.

[0013] The power monitoring unit 12 is connected by, for example, a power monitoring circuit 22 shown in FIG. The power monitoring unit 12 monitors whether or not DC power is being supplied from the DC power source 1 to the load 4. When DC power is being supplied from the DC power supply 1 to the load 4, the power monitoring unit 12 outputs a periodic signal to the cutoff unit 13. The periodic signal may be, for example, a pulse signal, a triangular wave signal, or a signal similar to a sine wave. When the power monitoring unit 12 itself has a fault, it outputs a signal indicating that it has a fault to the cutoff unit 13. An example of the faulty part of the power monitoring unit 12 is its own signal output transistor 22n.

[0014] The interrupter 13 is connected by, for example, an interrupter circuit 23 shown in FIG. The breaker unit 13 includes a switch driver 13a and a switch 13b. When a drive signal is provided from the drive signal output unit 2 to the power supply connection unit 11 and a periodic signal is output from the power monitoring unit 12, the cut-off unit 13 maintains the connection between the DC power supply 1 and the load 4. The cut-off unit 13 cuts off the connection between the DC power supply 1 and the load 4 when a periodic signal is output from the power monitoring unit 12 while no drive signal is being provided from the drive signal output unit 2 to the power supply connection unit 11, or when the power monitoring unit 12 outputs a signal indicating that it is malfunctioning. In addition, when a drive signal is provided from the drive signal output unit 2 to the power supply connection unit 11 and no periodic signal is output from the power monitoring unit 12, the cut-off unit 13 cuts off the connection between the DC power supply 1 and the load 4.

[0015] The switch driving unit 13a controls the switch 13b to a closed state when maintaining the connection between the DC power supply 1 and the load 4, and controls the switch 13b to an open state when disconnecting the connection between the DC power supply 1 and the load 4. One end of the switch 13b is connected to the DC power supply 1, and the other end of the switch 13b is connected to the power supply connection unit 11.

[0016] 1, it is assumed that the power supply connection unit 11, the power monitoring unit 12, and the cutoff unit 13, which are components of the control device 3, are each realized by dedicated hardware as shown in Fig. 2. In other words, it is assumed that the control device 3 is realized by a power supply connection circuit 21, a power monitoring circuit 22, and a cutoff circuit 23. Each of the power supply connection circuit 21, the power monitoring circuit 22, and the shutdown circuit 23 may be, for example, a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof.

[0017] The components of the control device 3 are not limited to those realized by dedicated hardware, and the control device 3 may be realized by software, firmware, or a combination of software and firmware. The software or firmware is stored as a program in the memory of a computer. A computer refers to hardware that executes the program, such as a CPU (Central Processing Unit), GPU (Graphics Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, processor, or DSP (Digital Signal Processor).

[0018] FIG. 3 is a hardware configuration diagram of a computer in the case where the control device 3 is realized by software, firmware, or the like. When the control device 3 is realized by software, firmware, or the like, a program for causing a computer to execute the respective processing procedures of the power supply connection unit 11, the power monitoring unit 12, and the cutoff unit 13 is stored in the memory 31. Then, a processor 32 of the computer executes the program stored in the memory 31.

[0019] 2 shows an example in which each of the components of the control device 3 is realized by dedicated hardware, while Fig. 3 shows an example in which the control device 3 is realized by software, firmware, etc. However, this is merely an example, and some of the components in the control device 3 may be realized by dedicated hardware, and the remaining components may be realized by software, firmware, etc.

[0020] Fig. 4 is a circuit diagram showing an example of the power monitoring circuit 22 shown in Fig. 2. The power monitoring circuit 22 shown in Fig. 4 is merely an example. In FIG. 4, one end of the resistor 22 a is connected to the connection point between the power supply connection part 11 and the load 4 . The other end of the resistor 22a is connected to one end of a capacitor 22b, one end of a resistor 22c, and the positive input terminal of an operational amplifier 22h. One end of the capacitor 22b is connected to the other end of the resistor 22a, one end of the resistor 22c, and the positive input terminal of the operational amplifier 22h. The other end of the capacitor 22b is grounded. One end of the resistor 22c is connected to the other end of the resistor 22a, one end of the capacitor 22b, and the positive input terminal of the operational amplifier 22h. The other end of the resistor 22c is connected to the collector terminal of the transistor 22d.

[0021] The collector terminal of the transistor 22d is connected to the other end of the resistor 22c. The emitter terminal of transistor 22d is grounded. The base terminal of the transistor 22d is connected to one end of the resistor 22l.

[0022] A voltage is applied to one end of the resistor 22e, and the other end of the resistor 22e is connected to one end of the resistor 22f, one end of the resistor 22g, and the negative input terminal of the operational amplifier 22h. One end of the resistor 22f is connected to the other end of the resistor 22e, one end of the resistor 22g, and the negative input terminal of the operational amplifier 22h. The other end of the resistor 22f is grounded. One end of the resistor 22g is connected to the other end of the resistor 22e, one end of the resistor 22f, and the negative input terminal of the operational amplifier 22h. The other end of the resistor 22g is connected to the collector terminal of the transistor 22j.

[0023] The positive input terminal of the operational amplifier 22h is connected to the other end of the resistor 22a, one end of the capacitor 22b, and one end of the resistor 22c. The negative input terminal of the operational amplifier 22h is connected to the other end of the resistor 22e, one end of the resistor 22f, and one end of the resistor 22g. The output terminal of the operational amplifier 22h is connected to one end of the resistor 22i, the other end of the resistor 22k, the other end of the resistor 22l, and one end of the resistor 22m.

[0024] One end of the resistor 22i is connected to the output terminal of the operational amplifier 22h, the other end of the resistor 22k, the other end of the resistor 22l, and one end of the resistor 22m. A voltage is applied to the other end of the resistor 22i. The collector terminal of the transistor 22j is connected to the other end of the resistor 22g. The emitter terminal of transistor 22j is grounded. The base terminal of the transistor 22j is connected to one end of a resistor 22k.

[0025] One end of the resistor 22k is connected to the base terminal of the transistor 22j. The other end of the resistor 22k is connected to the output terminal of the operational amplifier 22h, one end of the resistor 22i, the other end of the resistor 22l, and one end of the resistor 22m. One end of the resistor 22l is connected to the base terminal of the transistor 22d. The other end of the resistor 22l is connected to the output terminal of the operational amplifier 22h, one end of the resistor 22i, the other end of the resistor 22k, and one end of the resistor 22m. One end of the resistor 22m is connected to the output terminal of the operational amplifier 22h, one end of the resistor 22i, the other end of the resistor 22k, and the other end of the resistor 22l. The other end of the resistor 22m is connected to the base terminal of the transistor 22n.

[0026] The transistor 22n is a transistor that the power monitoring unit 12 has for outputting a signal. The base terminal of the transistor 22n is connected to the other end of the resistor 22m. The collector terminal of the transistor 22n is connected to one end of the resistor 22p and the input side of the switch driver 13a. The emitter terminal of transistor 22n is grounded. One end of the resistor 22p is connected to the collector terminal of the transistor 22j and the input side of the switch driver 13a. A voltage is applied to the other end of the resistor 22p.

[0027] Next, the operation of the control system shown in FIG. 1 will be described. FIG. 5 is a flowchart showing a control method, which is a processing procedure of the control device 3. First, the drive signal output unit 2 outputs to the control device 3 a drive signal instructing the supply of DC power. When a drive signal is received from the drive signal output unit 2 (step ST1 in FIG. 5: YES), the switch drive unit 13a of the cutoff unit 13 controls the switch 13b to the closed state. Here, the switch driving unit 13a controls the switch 13b to the closed state when a driving signal is given from the driving signal output unit 2. However, this is just one example, and the switch 13b may be controlled to be always in the closed state unless a failure of the power supply connection unit 11 or the power monitoring unit 12 is detected. When a drive signal is received from the drive signal output unit 2 (step ST1 in FIG. 5: YES), the power supply connection unit 11 of the control device 3 connects the DC power supply 1 and the load 4 (step ST2 in FIG. 5).

[0028] If no drive signal is received from the drive signal output unit 2 (step ST1 in FIG. 5: NO), the power supply connection unit 11 disconnects the DC power supply 1 from the load 4 (step ST3 in FIG. 5). However, if an ON fault occurs in the power supply connection unit 11, the power supply connection unit 11 cannot disconnect the DC power supply 1 from the load 4.

[0029] The power monitoring unit 12 monitors whether or not DC power is being supplied from the DC power source 1 to the load 4. If DC power is being supplied from the DC power supply 1 to the load 4 (step ST4 in FIG. 5: YES), the power monitoring unit 12 outputs a periodic signal as shown in FIG. 6 to the cutoff unit 13 (step ST5 in FIG. 5). FIG. 6 is an explanatory diagram showing the DC voltage applied to the load 4, the voltage applied to the positive input terminal of the operational amplifier 22h, and the periodic signal output from the power monitoring unit 12. In FIG.

[0030] When DC power is supplied from the DC power supply 1 to the load 4, if the transistor 22d is open, the capacitor 22b is charged by the DC voltage applied to the other end of the resistor 22a. At this time, the voltage applied to the positive input terminal of the operational amplifier 22h increases with a certain time constant, as shown in FIG. Transistor 22d alternates between an open state and a closed state, and when transistor 22d is in the closed state, the charge stored in capacitor 22b is discharged. At this time, the voltage applied to the positive input terminal of operational amplifier 22h decreases with a certain time constant, as shown in Figure 6.

[0031] When the voltage applied to the positive input terminal of the operational amplifier 22h is equal to or greater than the threshold, the operational amplifier 22h outputs an H-level signal to the base terminal of the transistor 22n via the resistor 22m. When the voltage applied to the positive input terminal of the operational amplifier 22h is less than the threshold, the operational amplifier 22h outputs an L-level signal to the base terminal of the transistor 22n via the resistor 22m. The transistor 22n is in a closed state when the magnitude of the signal output from the operational amplifier 22h is equal to or greater than a threshold, and is in an open state when the magnitude of the signal output from the operational amplifier 22h is less than the threshold. Specifically, when an H-level signal is applied to the base terminal of the transistor 22n from the operational amplifier 22h, the transistor 22n is turned on, and the resistor 22p is grounded. When an L-level signal is applied to the base terminal of the transistor 22n from the operational amplifier 22h, the transistor 22n is opened, and the power supply applying a voltage to the other end of the resistor 22p is connected to the switch driving unit 13a via the resistor 22p. In this way, the transistor 22n is alternately switched between the closed state and the open state, whereby a periodic signal as shown in FIG.

[0032] When DC power is not supplied from the DC power source 1 to the load 4, the capacitor 22b is not charged or discharged, so the transistor 22n is always in an open state, and the power monitoring unit 12 outputs an H-level signal to the switch driving unit 13a. When a fault occurs in which the transistor 22n is fixed in the closed state, the power monitoring unit 12 outputs an L-level signal to the switch driving unit 13a as a signal indicating that the transistor 22n itself is at fault.

[0033] When a drive signal is being provided from the drive signal output unit 2 to the power supply connection unit 11 (step ST6 in FIG. 5: YES), if a periodic signal is output from the power monitoring unit 12 (step ST7 in FIG. 5: YES), the cutoff unit 13 maintains the connection between the DC power supply 1 and the load 4 to continue operation, as shown in FIG. 7 (step ST8 in FIG. 5). That is, the switch drive unit 13a maintains the switch 13b in the closed state. In this case, both the power supply connection unit 11 and the power monitoring unit 12 are normal. FIG. 7 is an explanatory diagram showing the determination result of the interrupter 13 and the operation of the interrupter 13. In FIG.

[0034] When the drive signal output unit 2 does not provide the power supply connection unit 11 with a drive signal (step ST6 in FIG. 5: NO), if a periodic signal is output from the power monitoring unit 12 (step ST9 in FIG. 5: YES), the cutoff unit 13 cuts off the connection between the DC power supply 1 and the load 4 to perform an emergency stop, as shown in FIG. 7 (step ST10 in FIG. 5). That is, the switch drive unit 13a controls the open state of the switch 13b. In this case, an ON fault has occurred in the power supply connection unit 11.

[0035] When a drive signal is provided from the drive signal output unit 2 to the power supply connection unit 11 (step ST6: YES in FIG. 5), if an H-level signal is output from the power monitoring unit 12 (step ST7: NO in FIG. 5, step ST11: YES), the cutoff unit 13 cuts off the connection between the DC power supply 1 and the load 4 to perform an emergency stop, as shown in FIG. 7 (step ST10 in FIG. 5). That is, the switch drive unit 13a controls the open state of the switch 13b. In this case, an off fault has occurred in the power supply connection unit 11 or in the power monitoring unit 12. An off fault is a fault in which the power supply connection unit 11 is always fixed in the off state and does not switch to the on state.

[0036] When the drive signal output unit 2 does not provide the power supply connection unit 11 with a drive signal (step ST6 in FIG. 5: NO), if an H-level signal is output from the power monitoring unit 12 (step ST9 in FIG. 5: NO), the cutoff unit 13 maintains the connection between the DC power supply 1 and the load 4 because both the power supply connection unit 11 and the power monitoring unit 12 are normal (step ST8 in FIG. 5). Regardless of whether a drive signal is being provided from the drive signal output unit 2 to the power supply connection unit 11, if an L-level signal is output from the power monitoring unit 12, an ON failure has occurred in the transistor 22n, and therefore the cutoff unit 13 cuts off the connection between the DC power supply 1 and the load 4. In FIG. 5, the cutoff unit 13 is shown as doing nothing if the result of step ST11 is NO, but if an L-level signal is output from the power monitoring unit 12, for example, the result of step ST11 is NO, but the cutoff unit 13 cuts off the connection between the DC power supply 1 and the load 4.

[0037] In the first embodiment described above, the control device 3 is configured to include a power supply connection unit 11 that connects the DC power supply 1 and the load 4 when a drive signal instructing the supply of DC power is given and that disconnects the DC power supply 1 and the load 4 when the drive signal is not given, and a power monitoring unit 12 that outputs a periodic signal when DC power is being supplied from the DC power supply 1 to the load 4 and outputs a signal indicating that the DC power supply 1 and the load 4 are faulty when the drive signal is given to the power supply connection unit 11 and the power monitoring unit 12 outputs a periodic signal, and that disconnects the DC power supply 1 and the load 4 when the drive signal is not given to the power supply connection unit 11 and the power monitoring unit 12 outputs a periodic signal. Therefore, when a failure occurs in the power supply connection unit 11 or when a failure occurs in the power monitoring unit 12, the control device 3 can disconnect the DC power supply 1 from the load 4.

[0038] Embodiment 2 In the second embodiment, a control device 3 will be described in which a power monitoring unit 12 has a plurality of paths for monitoring whether or not DC power is being supplied from a DC power source 1 to a load 4.

[0039] The configuration of the control system according to the second embodiment is the same as that of the control system according to the first embodiment, and the configuration diagram showing the control system according to the second embodiment is FIG. FIG. 8 is a circuit diagram showing an example of the power monitoring circuit 22 included in the control device 3 of the control system according to the second embodiment. The resistor 22a and the resistor 22q are each a path for monitoring whether or not DC power is being supplied from the DC power supply 1 to the load 4. One end of the resistor 22q is connected to the connection point between the power supply connection part 11 and the load 4. The other end of the resistor 22q is connected to one end of the capacitor 22b, one end of the resistor 22c, and the positive input terminal of the operational amplifier 22h. In the example of Fig. 8, two paths are provided for monitoring whether or not DC power is being supplied, but this is just one example, and three or more such paths may be provided.

[0040] One end of the resistor 22a is connected to the connection point between the power supply connector 11 and the load 4. However, in the example of Fig. 4, if a failure occurs in which one end of the resistor 22a becomes disconnected from the connection point between the power supply connector 11 and the load 4, the power monitoring unit 12 will be unable to monitor whether or not DC power is being supplied from the DC power supply 1 to the load 4. As shown in Figure 8, when resistor 22q is connected in addition to resistor 22a, even if a failure occurs in which one end of resistor 22a becomes disconnected from the connection point between power supply connection unit 11 and load 4, power monitoring unit 12 can monitor whether DC power is being supplied from DC power supply 1 to load 4.

[0041] The voltage applied to the positive input terminal of the operational amplifier 22h changes depending on whether one end of the resistor 22a is disconnected from the connection point between the power supply connector 11 and the load 4 or not, and as a result, the signal output from the operational amplifier 22h changes. The threshold value of the transistor 22n is set so that a periodic signal is output even if the signal output from the operational amplifier 22h changes. The transistor 22n is in a closed state when the magnitude of the signal output from the operational amplifier 22h is equal to or greater than the threshold value, and is in an open state when the magnitude of the signal output from the operational amplifier 22h is less than the threshold value.

[0042] In the above-described second embodiment, the control device 3 is configured so that the power monitoring unit 12 has a plurality of paths for monitoring whether or not DC power is being supplied from the DC power supply 1 to the load 4, and determines whether or not DC power is being supplied by monitoring based on the plurality of paths. Therefore, when a failure occurs in the power supply connection unit 11 or the power monitoring unit 12, the control device 3 can cut off the connection between the DC power supply 1 and the load 4, and can continue monitoring even if part of the path for monitoring whether or not DC power is being supplied is disconnected.

[0043] In the control system shown in Fig. 1, the power monitoring unit 12 is provided outside the circuit breaker 13. However, this is merely an example, and the power monitoring unit 12 may be built into the circuit breaker 13 as shown in Fig. 9. FIG. 9 is a configuration diagram showing a control system in which the breaker unit 13 has a built-in power monitoring unit 12. 10, the breaker units 13 each having a built-in power monitoring unit 12 may be multiplexed. In this case, the DC power supply and the load are disconnected by the breaker unit 13 that is normally operable out of the two breaker units 13. FIG. 10 is a configuration diagram showing a control system in which the breaker units 13 each having a built-in power monitoring unit 12 are multiplexed.

[0044] In addition, the present disclosure allows for free combination of the respective embodiments, modification of any of the components of the respective embodiments, or omission of any of the components of the respective embodiments. [Explanation of symbols]

[0045] 1 DC power supply 2 Drive signal output section 3. Control device 4. Load 11 Power connection 12 Power Monitoring Unit 13 Breaker 13a Switch drive unit 13b Switch 21 Power supply connection circuit 22 Power monitoring circuit 22a resistance 22b capacitor 22c resistance 22d transistor 22e resistor 22f resistor 22g resistance 22h Op Amp 22i resistance 22j transistor 22k resistor 22l resistance 22m resistance 22n transistor 22p resistor 22q resistor 23 Breaking Circuit 31 memory 32 processors

Claims

1. a power supply connection unit that connects a DC power supply to a load when a drive signal instructing the supply of DC power is given, and that disconnects the DC power supply from the load when the drive signal is not given; a power monitoring unit that outputs a periodic signal when the DC power is being supplied from the DC power supply to the load, and that outputs a signal indicating that the power monitoring unit itself is faulty when the power monitoring unit itself is faulty; a disconnection unit that maintains the connection between the DC power supply and the load when a periodic signal is output from the power monitoring unit while the drive signal is being applied to the power supply connection unit, and that disconnects the connection between the DC power supply and the load when a periodic signal is output from the power monitoring unit while the drive signal is not being applied to the power supply connection unit, or when a signal indicating that the power monitoring unit itself is malfunctioning is output from the power monitoring unit; A control device comprising:

2. The interrupter is 2. The control device according to claim 1, wherein when the drive signal is applied to the power supply connection portion and no periodic signal is output from the power monitoring portion, the control device disconnects the DC power supply from the load.

3. The power monitoring unit 2. The control device according to claim 1, further comprising a plurality of paths for monitoring whether the DC power is being supplied from the DC power source to the load, and determining whether the DC power is being supplied by monitoring based on the plurality of paths.

4. the power supply connection unit connects the DC power supply to the load when a drive signal instructing the supply of DC power is given, and disconnects the DC power supply from the load when the drive signal is not given; a power monitoring unit that outputs a periodic signal when the DC power is being supplied from the DC power supply to the load, and that outputs a signal indicating that the power monitoring unit itself is faulty when the power monitoring unit itself is faulty; A cutoff unit maintains the connection between the DC power supply and the load when a periodic signal is output from the power monitoring unit while the drive signal is being applied to the power supply connection unit, and cuts off the connection between the DC power supply and the load when a periodic signal is output from the power monitoring unit while the drive signal is not being applied to the power supply connection unit, or when a signal indicating that the power monitoring unit itself is malfunctioning is output from the power monitoring unit. Control method.

5. a DC power supply that outputs DC power; a drive signal output unit that outputs a drive signal that instructs the supply of the DC power; a power supply connection unit that connects the DC power supply and a load when the drive signal is received from the drive signal output unit, and that disconnects the DC power supply and the load when the drive signal is not received; a power monitoring unit that outputs a periodic signal when the DC power is being supplied from the DC power supply to the load, and that outputs a signal indicating that the power monitoring unit itself is faulty when the power monitoring unit itself is faulty; a disconnection unit that maintains the connection between the DC power supply and the load when a periodic signal is output from the power monitoring unit while the drive signal is being applied to the power supply connection unit, and that disconnects the connection between the DC power supply and the load when a periodic signal is output from the power monitoring unit while the drive signal is not being applied to the power supply connection unit, or when a signal indicating that the power monitoring unit itself is malfunctioning is output from the power monitoring unit; A control system with

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