JP5954456B1 - Unauthorized use detection system and power supply device provided with the same - Google Patents

Abstract

An unauthorized use detection system capable of detecting unauthorized use of a power supply device with high accuracy and a power supply device including the same are provided. The power supply device includes an electromagnetic relay having a set coil and a reset coil, a drive unit having a set side switching element and a reset side switching element, and a control device. In the unauthorized use detection system, a detection unit 30 that detects a change in potential at an arbitrary position between the set coil 11 and the set-side switching element 51 and an output of a set signal to the set-side switching element 51 by the control device 20 The fraud determination unit 40 determines whether there is a possibility that the on / off state of the electromagnetic relay 10 has been illegally switched based on the state and the fluctuation of the potential detected by the detection unit 30. [Selection] Figure 1

Description

  The present invention relates to an unauthorized use detection system and a power supply apparatus including the same.

  Conventionally, as an electromagnetic relay, there exist some which were indicated in patent documents 1, for example. In this electromagnetic relay, an electromagnet whose polarity is reversed depending on the direction of current flow, and a fixed contact and a movable contact are contacted or separated according to the polarity of the electromagnet, and the fixed contact and the movable contact are held in contact or separated. A contact mechanism.

JP 2013-222699 A

  By the way, the conventional electromagnetic relay may be used in a power supply device for supplying power from outside to a building or the like. In such a power supply device, the supply of power to a building or the like can be arbitrarily stopped or started by turning on and off the electromagnetic relay with an external signal.

  However, since the conventional electromagnetic relay can be forcibly switched on and off by applying a strong magnetic field from the outside, in the power supply device using this conventional electromagnetic relay, for example, illegal use using a strong magnet May be stolen by unsafe operations. Whether or not such an unauthorized operation is performed cannot be determined unless the power supply apparatus is directly confirmed, and it is difficult to accurately grasp whether or not the power supply apparatus has been used illegally.

  In view of the above-described problems, it is an object of the present invention to provide an unauthorized use detection system that can detect unauthorized use of a power supply apparatus with high accuracy and a power supply apparatus including the unauthorized use detection system.

  In order to solve the above problems, the unauthorized use detection system of the present invention has at least one coil that generates a magnetic field in a direction opposite to each other by supplying a current, and supplies a predetermined set current to the coil. An electromagnetic relay that is switched from the off state to the on state and is switched from the on state to the off state when a predetermined reset current is supplied to the coil, and is electrically connected to the coil, and the set current or An unauthorized use detection system for a power supply device comprising: a drive unit that supplies the reset current; and a control device that outputs a control signal for causing the drive unit to supply the set current or the reset current, A detector for detecting fluctuations in the induced electromotive force of the coil; an output state of the control signal; and an induced electromotive force detected by the detector Based on the variation, having a fraud determination unit to determine whether the on-off state is likely switched incorrectly the electromagnetic relay.

  According to the unauthorized use detection system of the present invention, the on / off state of the electromagnetic relay is illegal based on the output state of the control signal for causing the drive unit to supply the set current or the reset current and the fluctuation of the induced electromotive force of the coil. It is determined whether or not there is a possibility of being switched to. Accordingly, it is possible to determine whether or not there is a possibility that the power supply device has been used illegally without directly checking the power supply device.

  As an embodiment of the present invention, the drive unit is connected to the coil and switches whether to supply the set current to the coil and switches whether to supply the reset current to the coil. A switch unit; and the control device is connected to the switch unit and configured to control the switch unit by the control signal, and the detection unit is provided between the coil and the switch unit. And at least one of any position between the coil and a reference potential is detected, and the fraud determination unit detects the output state of the control signal and the detection unit. It is good also as a structure which determines whether the on-off state of the said electromagnetic relay may be switched illegally based on the said fluctuation | variation of the said electric potential.

  According to this embodiment, at least one of an output state of a control signal for controlling the switch unit, an arbitrary position between the coil and the switch unit, and an arbitrary position between the coil and the reference potential It is determined whether there is a possibility that the on / off state of the electromagnetic relay has been illegally switched based on the potential fluctuation at. Accordingly, it is possible to determine whether or not there is a possibility that the power supply device has been used illegally without directly checking the power supply device.

  The reference potential includes, for example, a power supply and ground.

  As one embodiment of the present invention, the switch unit is connected to the coil, connected to the coil, and at least one set-side switching element that switches whether the set current is supplied to the coil, At least one reset-side switching element that switches whether or not the predetermined reset current is supplied to the coil, and the control device is connected to the set-side switching element and the reset-side switching element. The set-side switching element and the reset-side switching element are controlled by the control signal, and the detection unit is arranged at an arbitrary position between the coil and the set-side switching element, the coil and the Arbitrary position between the reset side switching element, and Variation of potential at at least one of the arbitrary positions between the reference potential and the fraud determination unit is configured to detect the control signal for controlling the set-side switching element or the reset-side switching element. It may be configured to determine whether there is a possibility that the on / off state of the electromagnetic relay has been illegally switched based on the output state and the fluctuation of the potential detected by the detection unit.

  According to this embodiment, the output state of the control signal for controlling the set-side switching element or the reset-side switching element, the arbitrary position between the coil and the set-side switching element, the coil and the reset-side switching element Whether or not the electromagnetic relay may have been illegally switched on and off based on any position in between and the variation in potential at any one of the positions between the coil and the reference potential Determine. Accordingly, it is possible to determine whether or not there is a possibility that the power supply device has been used illegally without directly checking the power supply device.

  As one embodiment of the present invention, the electromagnetic relay has, as the coil, a set coil to which the set current is supplied and a reset coil to which the reset current is supplied, and the set-side switching element is The reset coil is connected to the set coil, the reset switching element is connected to the reset coil, and the detection unit is at an arbitrary position between the set coil and the set switching element, the reset coil At any one position between the reset coil and the reset side switching element, at any position between the set coil and the reference potential, and at any position between the reset coil and the reference potential A variation in potential is detected, and the fraud determination unit controls the set-side switching element. The output state of the signal, based on the variation of the potential detected by the detecting unit, on-off state of the electromagnetic relay may be determined configure whether or not there is a possibility that has been switched incorrectly.

  According to this embodiment, the output state of the control signal for controlling the set-side switching element, the arbitrary position between the set coil and the set-side switching element, the arbitrary position between the reset coil and the reset-side switching element On / off state of the electromagnetic relay is determined based on the position of the current, the arbitrary position between the set coil and the reference potential, and the fluctuation of the potential in at least one of the arbitrary positions between the reset coil and the reference potential. It is determined whether or not there has been a possibility of unauthorized switching. Accordingly, it is possible to determine whether or not there is a possibility that the power supply device has been used illegally without directly checking the power supply device.

  As one embodiment of the present invention, when the fraud determination unit determines that the on / off state of the electromagnetic relay may be illegally switched, the on / off state of the electromagnetic relay is illegally switched. It is good also as a structure which has a transmission part which transmits the fraud determination signal showing that there exists possibility to the exterior.

  According to this embodiment, when it is determined that there is a possibility that the power supply device has been used illegally, this information can be transmitted to the outside. For this reason, it is possible to easily identify a power supply apparatus that may have been used illegally, and to reduce damage caused by unauthorized use of the power supply apparatus.

  As one embodiment of the present invention, when the fraud determination unit determines that there is a possibility that the on / off state of the electromagnetic relay has been illegally switched, the output of the control signal detected by the detection unit And a storage unit that stores unauthorized operation information including fluctuations in the potential, and the transmission unit may include the unauthorized operation information in the unauthorized determination signal and transmit the information to the outside.

  According to this embodiment, information transmitted to the outside includes information on the output of the control signal to the set-side switching element detected by the detection unit, and the connection portion between the coil and the set-side switching element or the coil and the reset Information on fluctuations in potential at the connection portion with the side switching element can be included. This makes it possible to accurately determine whether or not the power supply device may have been used illegally.

  As an embodiment of the present invention, the control device may also serve as the fraud determination unit.

  According to this embodiment, since the control device also serves as the fraud determination unit, the configuration can be simplified and the range of design of the fraud detection system can be expanded.

  The power supply device of the present invention includes the unauthorized use detection system.

  According to the power supply device of the present invention, unauthorized use of the power supply device can be detected with high accuracy.

  The unauthorized use detection method of the present invention has at least one coil that generates a magnetic field in the opposite direction when a current is supplied, and switches from an off state to an on state when a predetermined set current is supplied to the coil. An electromagnetic relay that is switched and switched from an on state to an off state when a predetermined reset current is supplied to the coil, and a drive that is electrically connected to the coil and supplies the set current or the reset current to the coil And a control device that outputs a control signal for causing the driving unit to supply the set current or the reset current, and a method for detecting unauthorized use of a power supply device, wherein fluctuations in induced electromotive force of the coil Based on the output state of the control signal and the detected fluctuation of the induced electromotive force, the on / off state of the electromagnetic relay is It determines whether there is switched possibilities.

  According to the unauthorized use detection method of the present invention, unauthorized use of a power supply device can be detected with high accuracy.

It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 1st Embodiment of this invention. It is the schematic which shows the ON state of the electromagnetic relay of the electric power supply apparatus of FIG. It is the schematic which shows the OFF state of the electromagnetic relay of the electric power supply apparatus of FIG. It is an electric circuit diagram which shows an example of the detection part and fraud determination part of the electric power supply apparatus of FIG. It is a figure which shows the relationship between the set signal and set coil voltage at the time of normal operation | movement of the electric power supply apparatus of FIG. 1, and the relationship between a reset signal and a reset coil voltage. It is a figure which shows the relationship between the set signal, reset signal, set coil voltage, and reset coil voltage at the time of the illegal operation | movement of the electric power supply apparatus of FIG. FIG. 6 is an enlarged view of a portion showing a relationship between a reset signal and a reset coil voltage in FIG. 5. It is a figure for demonstrating FIG. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 2nd Embodiment of this invention. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 3rd Embodiment of this invention. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 4th Embodiment of this invention. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 5th Embodiment of this invention. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 6th Embodiment of this invention. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 7th Embodiment of this invention. It is an electric circuit diagram which shows the structure of the electric power supply apparatus provided with the unauthorized use detection system of 8th Embodiment of this invention. It is a figure for demonstrating other embodiment of this invention. It is another figure for demonstrating other embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the following explanation, in describing the configuration shown in the drawings, terms indicating directions such as “up”, “down”, “left”, “right”, and other terms including them are used. However, the purpose of using these terms is to facilitate understanding of the embodiments through the drawings. Therefore, these terms do not necessarily indicate the direction in which the embodiments of the present invention are actually used, and the technical scope of the invention described in the claims is limitedly interpreted by these terms. Should not be done.

(First embodiment)
As shown in FIG. 1, the power supply device 100 including the unauthorized use detection system according to the first embodiment of the present invention includes an electromagnetic relay 10, a control device 20, a detection unit 30, an unauthorized determination unit 40, and a drive. Part 50.

  The electromagnetic relay 10 is electrically connected to a drive unit 50 having a switch unit. The switch unit of the drive unit 50 includes a set side switching element 51 and a reset side switching element 52. The control device 20 is connected to each of the set-side switching element 51 and the reset-side switching element 52 of the drive unit 50. The detection unit 30 is connected to a predetermined position between the electromagnetic relay 10 of the drive unit 50 and the set-side switching element 51. The fraud determination unit 40 is connected to a predetermined position between the control device 20 and the set-side switching element 51 and the detection unit 30. The detection unit 30 and the fraud determination unit 40 constitute an example of an unauthorized use detection system.

The electromagnetic relay 10 is a self-holding type electromagnetic relay, and is connected to the electromagnet block 60, the armature 70 disposed between the yokes 63 of the electromagnet block 60 , and the armature 70 as shown in FIGS. 2 and 3. Card 80 and a contact mechanism 90 connected to the card 80.

  The electromagnet block 60 includes a coil 62 wound around a spool 61, yokes 63 and 64 provided on both ends of an iron core (not shown) protruding from both sides of the spool 61, and first to third coil terminals 65 to 65. 67. In this electromagnet block 60, the set coil 11 and the reset coil 12 shown in FIG. 1 are wound around the same spool 61 as a coil 62. The set coil 11 and the reset coil 12 are wound so as to generate magnetic fields in opposite directions by supplying current, and diodes (not shown) for preventing back electromotive force are formed at both ends thereof. Z). The lead wire of the set coil 11 is connected to the first and second coil terminals 65 and 66, respectively, and the lead wire of the reset coil 12 is connected to the second and third coil terminals 66 and 67, respectively. Yes. That is, the first and second coil terminals 65 and 66 constitute a set coil terminal, and the second and third coil terminals 66 and 67 constitute a reset coil terminal.

  Note that the first coil terminal 65 is connected to the set-side switching element 51. The second coil terminal 66 is connected to the power source 1 for supplying current to the coil 62. The third coil terminal 67 is connected to the reset side switching element 52.

  The armature 70 is composed of a permanent magnet (not shown) and a pair of plate-like iron pieces 71 and 72 that sandwich the permanent magnet, and is arranged so as to be rotatable around a rotation shaft 73 provided at the center. ing. This armature 70 insert-molds a pair of plate-shaped iron pieces 71 and 72 that sandwich a permanent magnet. Further, the armature 70 is formed with an arm portion 74 extending in the radial direction from the rotation shaft 73.

  The card 80 is connected to the tip of the arm portion 74 of the armature 70, and is arranged to be slidable in the X direction shown in FIGS.

  The contact mechanism 90 includes a movable contact terminal 91 in which a movable contact piece 92 connected to one end of the card 80 is fixed by caulking, and a fixed contact terminal 94. The movable contact piece 92 is provided with a movable contact 93, and the fixed contact terminal 94 is provided with a fixed contact 95 that contacts the movable contact 93.

  As shown in FIG. 2, when a predetermined set current is supplied to the set coil terminal, one end of the plate-like iron piece 72 on the upper side in the Y direction of the armature 70 is attracted to the yoke 63 on the right side in the X direction, while the lower in the Y direction. One end of the plate-like iron piece 71 on the side is adsorbed to the yoke 64 on the left side in the X direction. As a result, the armature 70 rotates clockwise, and the card 80 is slid to the left in the X direction. As the card 80 moves, the movable contact piece 92 is pressed to the left in the X direction, the movable contact 93 contacts the fixed contact 95, and the electromagnetic relay 10 is switched from the off state to the on state. Thereafter, even when the supply of the set current is stopped, the electromagnetic relay 10 remains on.

  On the other hand, as shown in FIG. 3, when a predetermined reset current is supplied to the reset coil terminal, the other end of the iron plate 71 on the lower side in the Y direction of the armature 70 is attracted to the yoke 63 on the right side in the X direction. The other end of the iron plate 72 on the upper side in the Y direction is attracted to the yoke 64 on the left side in the X direction. As a result, the armature 70 rotates counterclockwise, and the card 80 slides to the right in the X direction. By the movement of the card 80, the movable contact piece 92 is pressed to the right in the X direction, the movable contact 93 is separated from the fixed contact 95, and the electromagnetic relay 10 is switched from the on state to the off state. Thereafter, even if the supply of the reset current is stopped, the electromagnetic relay 10 maintains the off state.

  As shown in FIG. 1, the control device 20 includes a switching element control unit 21, a reception unit 22 for receiving an external signal, and a transmission unit 23 for transmitting a control signal.

  The switching element control unit 21 includes a microcomputer and an input / output device (not shown), and outputs a control signal for switching the on / off state of the electromagnetic relay 10 based on the external signal received by the receiving unit 22. When switching the electromagnetic relay 10 from the off state to the on state, the switching element control unit 21 outputs a set signal for controlling the set side switching element 51 as a control signal. When switching the electromagnetic relay 10 from the on state to the off state, the switching element control unit 21 outputs a set signal for controlling the reset side switching element 52 as a control signal. The control signal output by the switching element control unit 21 is transmitted to the set side switching element 51 and the reset side switching element 52 by the transmission unit 23.

  As shown in FIG. 4, the detection unit 30 includes a comparator circuit 31 and a variable resistor 32 connected to a power source 33 and a ground 34. The comparator circuit 31 includes a non-inverting input terminal connected to a predetermined position between the set coil 11 and the set-side switching element 51 of the electromagnetic relay 10 and an inverting input terminal connected to the movable terminal of the variable resistor 32. And an output terminal.

  In this detection unit 30, the comparator circuit 31 compares the potential at a predetermined position between the set coil 11 and the set-side switching element 51 with a predetermined comparison potential set by the variable resistor 32, and determines its level. By doing so, the fluctuation | variation of the induced electromotive force of the set coil 11 is detected. When it is determined that the potential at a predetermined position between the set coil 11 and the set-side switching element 51 is lower than the comparison potential, a “Low” state signal is output, and the set coil 11 and the set-side switching element 51 When it is determined that the potential at a predetermined position in between is higher than the comparison potential, a signal in the “High” state is output. The signal output from the comparator circuit 31 is transmitted from the comparator circuit 31 to the fraud determination unit 40.

  The non-inverting input terminal of the comparator circuit 31 can be connected to any position as long as it is a position between the set coil 11 and the set-side switching element 51.

  As illustrated in FIG. 1, the fraud determination unit 40 includes a determination unit 41, a reception unit 42, a storage unit 43, and a transmission unit 44.

  As illustrated in FIG. 4, the determination unit 41 includes an OR element, and is connected to the comparator circuit 31 and a predetermined position between the control device 20 and the set-side switching element 51. The determination unit 41 is configured to turn on the electromagnetic relay 10 based on the output state of the set signal and the potential fluctuation at a predetermined position between the set coil 11 and the set-side switching element 51 detected by the detection unit 30. It is determined whether or not there is a possibility of being illegally switched from the state to the off state. In FIG. 4, the receiving unit 42, the storage unit 43, and the transmitting unit 44 are omitted for convenience of explanation.

  Specifically, the determination unit 41 receives the signal output from the comparator circuit 31 and detects the signal output from the control device 20 to the set-side switching element 51 to determine the output state of the set signal. Since the control signal output from the control device 20 is a pulse signal, when the set signal is output, it is determined that the set signal is in the “High” state, and when the set signal is not output, the set signal is It is determined that the state is “Low”. When the signal output from the comparator circuit 31 is in the “Low” state and the determined output state of the set signal is in the “Low” state, that is, although the set signal is not output. First, when an induced electromotive force is generated in the set coil 11, the determination unit 41 determines that there is a possibility that the electromagnetic relay 10 has been illegally switched from the on state to the off state.

  When it is determined that there is a possibility that the electromagnetic relay 10 has been illegally switched from the on state to the off state, the determination unit 41 indicates that the power supply device 100 may have been used illegally. Is output.

  The determination unit 41 can be connected to any position as long as it is a position between the control device 20 and the set-side switching element 51.

  The receiving unit 42 receives an external signal transmitted from the outside of the power supply apparatus 100. When the determination unit 41 determines that there is a possibility that the electromagnetic relay 10 has been illegally switched from the on state to the off state, the storage unit 43 changes the induced electromotive force of the set coil 11 detected by the detection unit 30. And the output state of the set signal determined by the determination unit 41 is stored as unauthorized operation information. The transmission unit 44 transmits the fraud determination signal to the outside of the power supply device 100 when the fraud determination signal is output by the determination unit 41, and also stores the fraud determination signal according to the external signal received by the reception unit 42. The unauthorized operation information stored in 43 is transmitted to the outside of the power supply apparatus 100.

  The drive unit 50 includes a switch unit having a set-side switching element 51 and a reset-side switching element 52, and electric wires that electrically connect the switch unit to the set coil 11 and the reset coil 12 of the electromagnetic relay 10. Yes.

  The set-side switching element 51 and the reset-side switching element 52 are composed of npn-type bipolar transistors. As shown in FIG. 1, the set-side switching element 51 has a base terminal connected to the control device 20, a collector terminal connected to a first coil terminal 65 constituting a set coil terminal of the electromagnetic relay 10, and an emitter terminal grounded. 2 is connected. The set-side switching element 51 switches whether to supply a predetermined set current to the set coil of the electromagnetic relay 10 according to a set signal output from the control device 20. Further, as shown in FIG. 1, the reset side switching element 52 has a base terminal connected to the control device 20, a collector terminal connected to a third coil terminal 67 constituting a reset coil terminal of the electromagnetic relay 10, and an emitter terminal. Is connected to the ground 2. The reset-side switching element 52 switches whether to supply a predetermined reset current to the reset coil of the electromagnetic relay 10 according to a reset signal output from the control device 20.

  Next, an unauthorized use detection method using the unauthorized use detection system having the above configuration will be described with reference to FIGS. Here, it is determined whether or not the electromagnetic relay 10 may be illegally switched from the off state to the on state. 5 to 7, the set coil voltage is a voltage (potential difference) between a predetermined position between the set coil 11 and the set-side switching element 51 and the ground 2, and the reset coil voltage is the reset coil. 12 and a voltage (potential difference) between a predetermined position between the reset switching element 52 and the ground 2.

  For example, the set signal is output from the control device 20 and the electromagnetic relay 10 is normally switched from the off state to the on state, and the reset signal is output from the control device 20 and the electromagnetic relay 10 is normally switched from the on state to the off state. Suppose that In this case, as shown in FIG. 5, the voltage of the set coil 11 or the reset coil 12 changes almost simultaneously with the output of the set signal or the reset signal.

  On the other hand, it is assumed that the armature 70 is forcibly rotated by an unauthorized operation, and the electromagnetic relay 10 is switched from the off state to the on state even though the set signal is not output from the control device 20. In this case, as shown in FIG. 6, the voltage of the set coil 11 fluctuates in the negative direction (lower side in FIG. 6) due to the induced electromotive force accompanying the rotation of the armature 70, and the voltage of the reset coil 12 increases in the positive direction ( It fluctuates in the upper part of FIG. That is, although the set signal is not output, the voltage of the set coil 11 varies.

  As described above, the voltage of the set coil 11 is monitored, and at the same time when the set signal is output, it is determined whether or not the voltage of the set coil 11 has fluctuated. Thus, it can be determined whether or not the on / off state of the power supply apparatus 100 may be illegally switched.

  The electromagnetic relay 10 is provided with diodes (not shown) at both ends of the set coil 11 and the reset coil 12 to absorb back electromotive force. That is, when the electromagnetic relay 10 is switched from the off state to the on state, the voltage of the reset coil 12 does not become higher than the forward voltage of the diode as shown in FIG. The position between them is easier to detect the fluctuation of the potential than the position between the reset coil 12 and the reset-side switching element 52. For this reason, when a diode for preventing back electromotive force is provided as in the electromagnetic relay 10, power is supplied by detecting a change in potential at a connection portion between the set coil 11 and the set side switching element 51. It is possible to improve the accuracy of determination as to whether there is a possibility that the device 100 has been used illegally.

  In addition, when the electromagnetic relay 10 is normally turned off in response to the reset signal, an induced electromotive force is generated in the reset coil 12 as the armature 70 rotates. That is, as shown in FIG. 8, the waveform of the potential detected by the detection unit 30 is a pulse waveform of a potential at a predetermined position between the reset coil 12 and the reset-side switching element 52 (the waveform of (a) in FIG. 8). ) And the waveform of the induced electromotive force (the waveform of FIG. 8B) (the waveform of FIG. 8C), and overshoot appears as shown in FIG.

  On the other hand, for example, it is assumed that the electromagnetic relay 10 cannot be switched from the on state to the off state while a strong magnet is fixed to the outside of the electromagnetic relay 10. In this case, even if the reset signal is output from the control device 20, the armature 70 cannot be rotated by the magnetic force of the magnet fixed to the outside. Therefore, as shown in FIG. 8, the waveform of the potential detected by the detection unit 30 is a pulse waveform of the potential at a predetermined position between the reset coil 12 and the reset-side switching element 52 ((a) in FIG. 8). And no overshoot appears.

  Thus, the potential of the connection portion between the reset coil 12 and the reset-side switching element 52 when the reset signal is output from the control device 20 is monitored, and it is determined whether or not an overshoot appears in the waveform. Thus, it can be determined whether there is a possibility that the on / off state of the power supply apparatus 100 has been illegally switched.

(Other embodiments)
In the first embodiment, the detection unit 30 is connected to a predetermined position between the set coil 11 and the set-side switching element 51 of the electromagnetic relay 10, and the predetermined portion between the set coil 11 and the set-side switching element 51 of the set coil 11. Although the fluctuation of the potential at the position is detected, the present invention is not limited to this. For example, as shown in FIG. 9, the detection unit 30 is connected to an arbitrary position between the reset coil 12 and the reset side switching element 52 of the electromagnetic relay 10, and an arbitrary position between the reset coil 12 and the reset side switching element 52 is set. The variation in potential at the position may be detected (second embodiment). In this case, in order to maintain detection accuracy, it is preferable not to provide a diode for preventing back electromotive force at both ends of the reset coil 12.

  As shown in FIG. 10, as a detection unit, between an arbitrary position between the set coil 11 and the set-side switching element 51 of the electromagnetic relay 10, and the reset coil 12 and the reset-side switching element 52 of the electromagnetic relay 10. A detection unit 130 connected to an arbitrary position may be provided (third embodiment). As a result, the power supply device 100 is obtained from the fluctuation of the potential at an arbitrary position between the set coil 11 and the set-side switching element 51 and the fluctuation of the potential at an arbitrary position between the reset coil 12 and the reset-side switching element 52. It can be determined whether or not there is a possibility of being used illegally. That is, it is possible to determine not only the possibility that the electromagnetic relay has been switched from the off state to the on state by an unauthorized operation, but also the possibility that the electromagnetic relay has been switched from the on state to the off state. For this reason, unauthorized use of the power supply device can be reliably prevented.

  In 1st Embodiment, although the control apparatus 20 and the fraud determination part 40 are provided separately, it is not restricted to this. For example, as illustrated in the fourth to sixth embodiments in FIGS. 11 to 13, the control device 120 may also serve as the fraud determination unit. Thereby, the configuration of the unauthorized use detection system can be simplified, and the degree of freedom in designing the unauthorized use detection system can be expanded. In this case, the control device 120 is provided with a determination unit 41 and a storage unit 43 in addition to the switching element control unit 21, the reception unit 22, and the transmission unit 23.

  In the fourth embodiment shown in FIG. 11, the detection unit 30 is connected to a predetermined position between the set coil 11 and the set-side switching element 51 of the electromagnetic relay 10. In the fifth embodiment shown in FIG. 12, the detection unit 30 is connected to a predetermined position between the reset coil 12 and the reset-side switching element 52 of the electromagnetic relay 10. Furthermore, in the sixth embodiment shown in FIG. 13, the detection unit 130 has a predetermined position between the set coil 11 and the set-side switching element 51 of the electromagnetic relay 10, and the reset coil 12 and reset-side switching of the electromagnetic relay 10. It is connected to a predetermined position between the elements 52. The detection unit 130 includes, for example, two comparator circuits, and compares the potential at a predetermined position between the set coil 11 and the set-side switching element 51 with a predetermined comparison potential set by the variable resistor 32. Then, the potential at a predetermined position between the reset coil 12 and the reset-side switching element 52 is compared with the predetermined comparison potential set by the variable resistor 32.

  In the fourth to sixth embodiments, the transmission unit 23 of the control device 20 not only transmits the set signal and the reset signal to the set-side switching element 51 and the reset-side switching element 52 but also the fraud determination signal and the fraudulent operation. The information is configured to be transmitted to the outside of the power supply device.

  Moreover, in the 1st-6th embodiment, although the electromagnetic relay 10 which has a coil of 2 windings is used, it is not restricted to this. As shown in the seventh and eighth embodiments of FIGS. 13 and 14, an electromagnetic relay 110 having a coil of one winding may be used.

  In the seventh embodiment shown in FIG. 14, an H-bridge circuit is used, and two set-side switching elements 51 and 151 and two reset-side switching elements 52 and 152 that are arranged so as to sandwich the electromagnetic relay 110 therebetween. And a drive unit 150 having a switch unit constituted by

  When the set signal is output from the switching element control unit 21 of the control device 20, the set signal is simultaneously output to the two set side switching elements 51 and 151, and the switching element 51 side to the switching element 151 side (from the left side of FIG. 14). Current flows on the right side). On the other hand, when a reset signal is output from the switching element control unit 21 of the control device 20, a reset signal is output simultaneously to the two reset-side switching elements 52 and 152, and the switching element 52 side (see FIG. 14). Current flows from the right side to the left side.

  In the eighth embodiment shown in FIG. 15, a drive unit 250 having a switch unit composed of the switching element 51 is provided. That is, the switching element 51 serves as both a set side switching element and a reset side switching element. The detection unit 30 is connected to a predetermined position between the electromagnetic relay 110 and the capacitor 54, and the fraud determination unit 40 is connected to a predetermined position between the detection unit 30, the control device 20, and the diode 53. Has been. The switching element control unit 21 of the control device 20 outputs a positive signal with respect to the reference potential (the potential of the ground 2) as a control signal.

  When a control signal is output from the control device 20, a current flows in the order of the diode 53 and the capacitor 54, and a set current is supplied to the electromagnetic relay 110. Thereby, the electromagnetic relay 110 is switched from the off state to the on state. The current is supplied to the electromagnetic relay 110 until the capacitor 54 is charged. At this time, since the potential on the emitter terminal side and the potential on the base terminal side are substantially the same, the switching element 51 is in an off state, and no current flows from the emitter terminal side to the collector terminal side.

  On the other hand, when the output of the control signal from the control device 20 is stopped, the potential at a predetermined position between the control device 20 and the diode 53 returns to the reference potential, and the potential on the base terminal side of the switching element 51 is also equal to the reference potential. Become. Further, since the capacitor 54 is in a charged state, the potential on the diode 53 side is higher than the reference potential. Therefore, the switching element 51 is turned on because the potential on the emitter terminal side is higher than the potential on the base terminal side. When the switching element 51 is turned on, a current flows from the emitter terminal side to the collector terminal side, and a reset current that flows in a direction opposite to the set current is supplied to the electromagnetic relay 110. Thereby, the electromagnetic relay 110 is switched from the on state to the off state.

The connection between the coil of the electromagnetic relay 10 and the switch unit and the connection between the coil of the electromagnetic relay 10 and the reference potential are not limited to the direct connection as shown in the first to eighth embodiments. For example, as shown in FIGS. 16 and 17, between the electromagnetic relay 10 and the switch unit (between the set coil 11 and the set-side switching element 51 in FIGS. 16 and 17), or between the electromagnetic relay 10 and the reference potential. during (16, during the set coil 11 and the power supply 1 does not include the position of the power supply 1, 17, set between the coils 11 and ground 2 that does not include the position of the ground 2), the circuit element such as a resistor there as being connected, or may be indirect connections.

  Moreover, even if the connection between the coil of the electromagnetic relay 10 and the switch unit, and the connection between the coil of the electromagnetic relay 10 and the reference potential is an indirect connection as shown in FIGS. The predetermined position where the detectors 30 and 130 are connected and the potential fluctuation is detected can be arbitrarily set except for the position of the power source 1 and the position of the ground 2. For example, as shown in FIGS. 16 and 17, the predetermined position between the set coil 11 and the set-side switching element 51 of the electromagnetic relay 10 is C1, D1, E1 in FIG. 16, or A2, B2 in FIG. , C2 may be used. Further, the predetermined position between the set coil 11 of the electromagnetic relay 10 and the power source 1 may be any of the positions A1 and B1 in FIG. 16, or between the set coil 11 of the electromagnetic relay 10 and the ground 2. The predetermined position may be any of positions D2 and E2 in FIG. Even if the detection units 30 and 130 are connected to any positions of A1 to E1 and A2 to E2, fluctuations in the dielectric electromotive force of the coil of the electromagnetic relay 10 can be detected.

  The electromagnetic relays 10 and 110 are not limited to the configuration of the embodiment described above, and have at least one coil that generates a magnetic field in the opposite direction by supplying a current, and are turned off when a set current is supplied to the coil. If it can be switched from the on state to the off state when the reset current is supplied to the coil, it can be appropriately changed.

  The control device 20 can be appropriately changed as long as it can output a control signal for causing the drive unit 50 to supply a set current or a reset current.

  The detection units 30 and 130 are not limited to the comparator circuit 31 and may be configured by, for example, a potential sensor.

  The determination unit 41 of the fraud determination unit 40 is not limited to an OR element, and other elements having equivalent functions can also be used. The determination unit 41 is not limited to a physical configuration such as a circuit, and may be configured by software.

  The unauthorized operation information is not limited to the variation in the induced electromotive force of the set coil 11 detected by the detection unit 30 and the output state of the set signal determined by the determination unit 41, but depending on the design of the unauthorized use detection system, etc. Any information can be included. For example, it may include fluctuations in the induced electromotive force of the reset coil or the output state of the reset signal.

  The unauthorized operation information may be transmitted to the outside of the power supply apparatus 100 together with the unauthorized determination signal output by the determination unit 41, or when the reception unit 42 of the unauthorized determination unit 40 receives a predetermined external signal. The fraud determination signal may be transmitted to the outside of the power supply apparatus 100 separately. Note that transmission of the fraud determination signal to the outside of the power supply apparatus 100 may be wired or wireless.

  When the fraud determination signal is output by the determination unit 41, a notification unit may be provided to notify the outside that there is a possibility that the power supply device 100 has been used illegally by issuing an alarm with light or sound. . Further, when the fraud determination signal is repeatedly output a predetermined number of times, an emergency signal indicating that the possibility that the power supply device has been illegally used is extremely high may be output.

  The drive unit 50 can be appropriately changed as long as it is electrically connected to the coils of the electromagnetic relays 10 and 110 and can supply a set current or a reset current to the coils.

  In addition, the switch unit is connected to the coils of the electromagnetic relays 10 and 110 and switches whether to supply a set current to the coils of the electromagnetic relays 10 and 110, and supplies a reset current to the coils of the electromagnetic relays 10 and 110. What is necessary is just to be able to switch whether to supply. For example, the switch unit may include one set-side switching element and one reset-side switching element as in the first to sixth embodiments, or the set-side switching element and the reset-side switching element as in the seventh embodiment. Two reset-side switching elements may be provided, or one switching element serving as both the set-side switching element and the reset-side switching element may be provided as in the eighth embodiment.

  The set-side switching element 51 and the reset-side switching element 52 are not limited to npn-type transistors, but have equivalent functions such as pnp-type transistors, MOSFETs (metal-oxide-semiconductor field-effect transistors), or thyristors, for example. Any switching element can be employed.

  It goes without saying that the constituent elements described in the above embodiments may be combined as appropriate, and may be selected, replaced, or deleted as appropriate.

  The unauthorized use detection system and the power supply apparatus of the present invention can be used for a smart meter including a latching relay for remotely controlling the start and stop of power supply arbitrarily from the outside, for example.

DESCRIPTION OF SYMBOLS 1 Power supply 2 Ground 10, 110 Electromagnetic relay 11 Set coil 12 Reset coil 20, 120 Control device 21 Switching element control part 22 Reception part 23 Transmission part 30,130 Detection part 31 Comparator circuit 32 Variable resistance 33 Power supply 34 Ground 40 Fraud determination part 41 determination unit 42 reception unit 43 storage unit 44 transmission unit 50, 150, 250 drive unit 51, 151 set side switching element 52, 152 reset side switching element 53 diode 54 capacitor 60 electromagnet block 61 spool 62 coil 63, 64 yoke 65 first 1 coil terminal 66 2nd coil terminal 67 3rd coil terminal 70 Armature 71, 72 Plate-shaped iron piece 73 Rotating shaft 74 Arm part 80 Card 90 Contact mechanism part 91 Movable contact terminal 92 Movable contact piece 93 Movable contact 94 Fixed contact terminal 95 Constant contact 100 power supply

Claims (8)

It has at least one coil that generates magnetic fields in opposite directions by supplying current, and is switched from an off state to an on state when a predetermined set current is supplied to the coil, and a predetermined reset is performed on the coil. An electromagnetic relay that is switched from an on state to an off state when current is supplied;
A drive unit electrically connected to the coil and supplying the set current or the reset current to the coil;
A control device for outputting a control signal for causing the driving unit to supply the set current or the reset current;
An unauthorized use detection system for a power supply device comprising:
A detection unit for detecting fluctuations in the induced electromotive force generated in the coil by switching the on / off state of the electromagnetic relay ;
An fraud determination unit that determines whether the on / off state of the electromagnetic relay may be illegally switched based on the output state of the control signal and the fluctuation of the induced electromotive force detected by the detection unit When,
I have a,
The drive unit is connected to the coil and has a switch unit for switching whether to supply the set current to the coil and to switch whether to supply the reset current to the coil,
The control device is connected to the switch unit, and is configured to control the switch unit by the control signal,
The detection unit detects a variation in potential at any one of an arbitrary position between the coil and the switch unit and an arbitrary position between the coil and a reference potential as the variation of the induced electromotive force. And
Whether the fraud determination unit may have been illegally switched on / off state of the electromagnetic relay based on the output state of the control signal and the fluctuation of the potential detected by the detection unit. An unauthorized use detection system to determine . The switch unit is connected to the coil, and is connected to the coil and at least one set-side switching element that switches whether the set current is supplied to the coil, and the predetermined reset current is supplied to the coil. And at least one reset-side switching element that switches whether to be supplied,
The control device is connected to the set-side switching element and the reset-side switching element, and is configured to control the set-side switching element and the reset-side switching element by the control signal,
The detection unit is an arbitrary position between the coil and the set-side switching element, an arbitrary position between the coil and the reset-side switching element, and an arbitrary position between the coil and the reference potential Detecting potential fluctuations in at least one of the positions of
Based on the output state of the control signal for controlling the set-side switching element or the reset-side switching element and the fluctuation of the potential detected by the detection unit, the fraud determination unit determines whether oFF states might have switched illegally abuse detection system according to claim 1. The electromagnetic relay has, as the coil, a set coil to which the set current is supplied and a reset coil to which the reset current is supplied,
The set-side switching element is connected to the set coil, and the reset-side switching element is connected to the reset coil,
The detection unit is located at any position between the set coil and the set-side switching element, between any position between the reset coil and the reset-side switching element, and between the set coil and the reference potential. Detecting a variation in potential at any position and at least one of any position between the reset coil and the reference potential;
The fraud determination unit switches the on / off state of the electromagnetic relay illegally based on the output state of the control signal for controlling the set-side switching element and the fluctuation of the potential detected by the detection unit. The unauthorized use detection system according to claim 2 , wherein it is determined whether or not there is a possibility of being abused. When the fraud determination unit determines that the on / off state of the electromagnetic relay may have been illegally switched, the fraud determination indicating that the on / off state of the electromagnetic relay may have been illegally switched The unauthorized use detection system according to any one of claims 1 to 3 , further comprising a transmission unit that transmits a signal to the outside. When the fraud determination unit determines that the on / off state of the electromagnetic relay may have been illegally switched, the fraudulent operation including the output of the control signal and the potential fluctuation detected by the detection unit The unauthorized use detection system according to claim 4 , further comprising a storage unit that stores information, wherein the transmission unit includes the unauthorized operation information in the unauthorized determination signal and transmits the information to the outside. The unauthorized use detection system according to any one of claims 1 to 5 , wherein the control device also serves as the fraud determination unit. A power supply apparatus comprising the unauthorized use detection system according to any one of claims 1 to 6 . It has at least one coil that generates magnetic fields in opposite directions by supplying current, and is switched from an off state to an on state when a predetermined set current is supplied to the coil, and a predetermined reset is performed on the coil. An electromagnetic relay that is switched from an on state to an off state when current is supplied;
A drive unit electrically connected to the coil and supplying the set current or the reset current to the coil;
A control device for outputting a control signal for causing the driving unit to supply the set current or the reset current;
Equipped with a,
The drive unit is connected to the coil and has a switch unit for switching whether to supply the set current to the coil and to switch whether to supply the reset current to the coil,
Wherein the controller, which is connected to the switch unit, which is not authorized to use the detection method of the power supply device that is configured to control the switch unit by the control signal,
As the fluctuation of the induced electromotive force generated in the coil by switching the on / off state of the electromagnetic relay, any position between the coil and the switch unit, and any position between the coil and the reference potential Detecting potential fluctuations in at least one of the positions ;
An unauthorized use detection method for determining whether or not there is a possibility that an on / off state of the electromagnetic relay has been illegally switched based on an output state of the control signal and a detected fluctuation of the potential .

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