JP6384779B2 - Contactless power supply system - Google Patents

Description

  The present invention relates to a non-contact power feeding system, and more particularly to a non-contact power feeding system that receives power supplied in a non-contact manner and supplies power to a load.

  Conventionally, an induction line that allows high-frequency current to flow along a moving line of a moving body is arranged, and a coil that is fed in a non-contact manner from the induction line is provided on the moving body, and the moving body is configured to be fed in a non-contact manner. A contactless power supply facility has been proposed (see, for example, Patent Document 1).

JP 11-178104 A

  In the non-contact power supply facility described in Patent Document 1, when the heat generating part of the moving body generates heat abnormally, both ends of the pickup coil are short-circuited, and the power is supplied to the moving body by cutting off the power supply to the moving body ( The voltage converter is protected.

  However, in the non-contact power supply facility described in Patent Document 1, when an abnormality occurs in a moving body, power supply to the moving body is interrupted, and thus the moving body in which an abnormality has occurred stops its operation. For this reason, when only a moving body in which an abnormality has occurred stops moving while a plurality of moving bodies are moving along the guide line, other moving bodies may come close to other moving bodies. Could adversely affect the operation of the.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a non-contact power feeding system that can continue power feeding to a moving body while protecting a voltage conversion unit when an abnormality occurs.

The non-contact power feeding system of the present invention is arranged along a moving path of a mobile body having a load that operates with electric power, and moves with the mobile body, a power supply line to which a high-frequency current is supplied from a power source, A power supply device that supplies power to the load. The power supply device includes a pickup unit including a power receiving coil that generates a voltage by electromagnetic induction due to interlinking of magnetic flux generated around the power supply line, a rectifying unit that rectifies an output of the pickup unit, and the rectifying unit A voltage conversion unit that converts a voltage value by switching the output voltage by a semiconductor switching element and supplies the voltage to the load, a control unit that controls an operation of the voltage conversion unit, and an output unit. The controller stops the switching operation of the semiconductor switching element and supplies the output voltage of the rectifier to the load when an abnormality occurs in at least one of the moving body and the power feeding device. Configured. The output unit outputs the content of the generated abnormality to an external device when the control unit stops the switching operation of the semiconductor switching element when the abnormality occurs. The control unit is configured to determine that a state in which a peak value of an input voltage of the voltage conversion unit is lower than an input lower limit voltage is abnormal.

  ADVANTAGE OF THE INVENTION According to this invention, the electric power feeding to a mobile body can be continued, aiming at protection of a voltage conversion part at the time of abnormality occurrence.

It is a block diagram of the non-contact electric power feeding system of this embodiment.

  Hereinafter, an embodiment of a non-contact power feeding system will be described with reference to the drawings.

  The contactless power supply system of the present embodiment employs an electromagnetic induction power supply method capable of supplying a large current. For example, power is supplied in a contactless manner to a self-propelled carriage (moving body) in a physical distribution transport system.

  FIG. 1 shows a schematic block diagram of the contactless power feeding system of the present embodiment. The contactless power supply system of this embodiment includes a power supply line 200 and a power supply apparatus 10.

  A high frequency current is supplied to the power supply line 200 from the high frequency power supply 300. The power supply line 200 is installed along the movement path of the moving body 100 that is a power supply target. The moving body 100 is composed of, for example, a self-propelled carriage that moves in a factory along a preset movement route. The moving body 100 includes a load 101 (for example, an inverter circuit that drives an electric motor or the like) that operates by receiving power supplied from the power supply apparatus 10. The moving body 100 is not limited to a self-propelled carriage, and may be a mobile device such as a transporter. Moreover, the load 101 with which the mobile body 100 is provided may be one or more.

  The high frequency power supply 300 converts the frequency of an external power supply such as a commercial AC power supply, and supplies a high frequency (for example, 40 kHz) AC current to the power supply line 200.

  The power feeding apparatus 10 moves along the power supply line 200 together with the moving body 100 as the moving body 100 moves along the movement path. The power supply apparatus 10 receives power from the power supply line 200 in a contactless manner and supplies power to the moving body 100.

  The power feeding device 10 includes a pickup unit 20, a rectifying unit 30, a voltage conversion unit 40, and a control unit 60. The power supply apparatus 10 according to this embodiment further includes a storage unit 61, an output unit 62, and a display unit 63.

  The pickup unit 20 includes a power receiving coil 21 and a capacitor 22 connected in series to the power receiving coil 21. The power receiving coil 21 is formed, for example, by winding a wire a predetermined number of times around a C-shaped core (not shown) through which the feeder 200 is passed through a central through hole. When a high frequency current is supplied to the power supply line 200 from the high frequency power supply 300, a magnetic flux is generated around the power supply line 200, and a voltage corresponding to the magnitude of the interlinked magnetic flux is generated in the power receiving coil 21. Here, the power receiving coil 21 and the capacitor 22 constitute an LC series resonance circuit in which the resonance frequency is set in the vicinity of the power supply frequency of the high-frequency power supply 300. For example, AC 180 to 260V is supplied from the pickup unit 20 to the rectifying unit 30. AC voltage is input.

  The rectifying unit 30 is composed of, for example, a full-wave rectification circuit using a diode bridge, and full-wave rectifies the alternating current output from the pickup unit 20 and outputs the rectified current to the voltage conversion unit 40.

  The voltage conversion unit 40 includes a smoothing capacitor 41, an inductor 42, a transistor 43 (semiconductor switching element), a resistor 44, a diode 45, and a smoothing capacitor 46.

  The smoothing capacitor 41 is composed of an electrolytic capacitor and is connected between the DC output terminals of the rectifying unit 30. One terminal of the inductor 42 is connected to the positive side (high potential side) terminal of the smoothing capacitor 41, and the collector terminal of the transistor 43 is connected to the other terminal of the inductor 42. The emitter terminal of the transistor 43 is connected to the minus side (low potential side) terminal of the smoothing capacitor 41 via a resistor 44 for current detection. A control signal from the control unit 60 is input to the base terminal of the transistor 43. The anode of the diode 45 is connected to the connection point between the inductor 42 and the transistor 43. A positive terminal of a smoothing capacitor 46 made of an electrolytic capacitor is connected to the cathode of the diode 45. The minus side terminal of the smoothing capacitor 46 is connected to the minus side terminal of the smoothing capacitor 41. A load 101 of the moving body 100 is connected between both ends of the smoothing capacitor 46.

  The storage unit 61 includes a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, and the control unit 60 reads and writes data. The storage unit 61 stores a program executed by the control unit 60, a threshold value for determining whether the operations of the power supply apparatus 10 and the moving body 100 are normal, and the like. The storage unit 61 of the present embodiment stores, for example, an output upper limit voltage that is an upper limit value of the output voltage V2 as a threshold for determining whether the operation of the power supply apparatus 10 is normal.

  The output unit 62 is a wireless module that communicates with the external monitoring device 80 using a short-range wireless communication method that does not require a license, such as specific low-power wireless communication. Note that the wireless communication method adopted by the output unit 62 is not limited to specific low-power wireless communication, and adopts a wireless communication method compliant with IEEE802.15.1, a wireless communication method compliant with IEEE802.15.4, or the like. May be. The output unit 62 may perform wired communication with the monitoring device 80.

  The display unit 63 includes, for example, a liquid crystal display, and is provided in the power supply apparatus 10 so that display content can be viewed from the outside of the power supply apparatus 10. The display content of the display unit 63 is controlled by the control unit 60.

  The control unit 60 is composed of, for example, a microcomputer, and realizes the functions described in the program by executing the program stored in the storage unit 61. That is, the control unit 60 controls on / off of the transistor 43 by switching the voltage level of the control signal applied to the base terminal of the transistor 43 to a high level or a low level. The analog input port of the control unit 60 receives the voltage across the resistor 44 and the output voltage V2 of the voltage conversion unit 40 (that is, the voltage across the smoothing capacitor 46). The control unit 60 is configured to periodically convert the voltage across the resistor 44 and the output voltage V2 of the voltage conversion unit 40 into digital values and take them in by a built-in A / D converter (not shown). Yes. The voltage across the resistor 44 corresponds to the magnitude of the current flowing through the transistor 43. The control unit 60 has a function of controlling the output voltage of the voltage conversion unit 40 by PWM (Pulse Width Modulation) control of the transistor 43.

  The control unit 60 also has a function of stopping the voltage boosting operation of the voltage conversion unit 40 when detecting an abnormality in the power supply apparatus 10 or the moving body 100. The control unit 60 according to the present embodiment is configured to determine that the output voltage V2 of the voltage conversion unit 40 exceeds a preset output upper limit voltage as an abnormality of the power supply apparatus 10. The control unit 60 periodically takes in the output voltage V2 of the voltage conversion unit 40, and increases or decreases the voltage value of the output voltage V2 and the threshold value read from the storage unit 61 (the output upper limit voltage that is the upper limit value of the output voltage V2). Compare When the voltage value of the output voltage V2 exceeds the output upper limit voltage, the control unit 60 determines that the operation of the power supply apparatus 10 is abnormal and turns off the transistor 43. As a result, the voltage conversion unit 40 stops the boosting operation, and the input voltage input to the voltage conversion unit 40 is supplied to the load 101 as it is without being boosted.

  When the controller 60 detects an abnormality in the power supply apparatus 10 or the moving body 100, the controller 60 causes the output unit 62 to output data indicating the content of the abnormality that has occurred to the external monitoring device 80. In addition, when detecting an abnormality in the power supply apparatus 10 or the moving body 100, the control unit 60 causes the display unit 63 to display the content of the abnormality that has occurred. Further, when the control unit 60 detects an abnormality in the power feeding apparatus 10 or the moving body 100, the control unit 60 stores the content of the abnormality that has occurred in the storage unit 61. The control unit 60 has a clocking function for counting the current date and time, and causes the storage unit 61 to store the details of the abnormality that has occurred along with the data of the date and time when the abnormality occurred.

  Incidentally, the voltage conversion unit 40 of the present embodiment has a circuit configuration of a boost chopper circuit, and the operation of the voltage conversion unit 40 will be described below.

  The pulsating voltage input from the rectifier 30 to the voltage converter 40 is smoothed by the smoothing capacitor 41. The controller 60 switches the transistor 43 from the off state to the on state at a predetermined cycle. When the transistor 43 is turned on, a current flows through the path of the smoothing capacitor 41 → the inductor 42 → the transistor 43 → the resistor 44 → the smoothing capacitor 41, and energy is accumulated in the inductor 42. When the voltage value obtained by feeding back the output voltage V2 exceeds a predetermined reference voltage, the control unit 60 switches the transistor 43 to the off state. When the transistor 43 is switched off, the energy accumulated in the inductor 42 is released when the transistor 43 is turned on, and a current flows through the path of the smoothing capacitor 41 → the inductor 42 → the diode 45 → the smoothing capacitor 46 → the smoothing capacitor 41. As a result, a voltage obtained by boosting the input voltage (for example, about 283 V DC) is generated between both ends of the smoothing capacitor 46.

  As described above, the control unit 60 performs PWM control of the transistor 43, whereby the output voltage V2 of the voltage conversion unit 40 (the voltage across the smoothing capacitor 46) is controlled to a constant voltage.

  Further, the voltage across the resistor 44 is input to the control unit 60, and the collector current flowing from the voltage across the resistor 44 to the transistor 43 is monitored. The controller 60 performs an overcurrent protection operation when the voltage across the resistor 44 exceeds a predetermined threshold.

  The output voltage V <b> 2 of the voltage conversion unit 40 is supplied to the load 101 of the moving body 100, and the load 101 operates by receiving power supply from the power supply apparatus 10. Thereby, even when the moving body 100 moves along the moving path and the power supply apparatus 10 moves along the power supply line 200 as the mobile body 100 moves, the power supply apparatus 10 supplies the power supply line 200 in a non-contact manner. The generated power can be supplied to the load 101 of the moving body 100.

  As described above, the control unit 60 compares the output upper limit voltage, which is the upper limit value of the output voltage V2 registered in advance in the storage unit 61, with the feedback value of the output voltage V2, and outputs the feedback value of the output voltage V2. If it is below the upper limit voltage, the PWM control of the transistor 43 is continued.

  On the other hand, when the feedback value of the output voltage V2 exceeds the output upper limit voltage, the control unit 60 determines that the operation of the power supply apparatus 10 is abnormal, turns off the transistor 43, and stops the operation of the voltage conversion unit 40. . When the transistor 43 is turned off, the voltage input to the voltage conversion unit 40 is supplied to the load 101 of the moving body 100. That is, the output voltage of the rectifier 30 is supplied to the load 101 without being boosted by the voltage converter 40. Thus, when the output voltage V2 of the voltage conversion unit 40 exceeds the output upper limit voltage, the control unit 60 stops the operation of the voltage conversion unit 40, so that it is difficult to supply an excessive voltage to the load 101. It is possible to reduce stress applied to circuit components (for example, the transistor 43) constituting the voltage conversion unit 40. Further, even when the operation of the power supply apparatus 10 becomes abnormal, the power supply to the moving body 100 is not cut off, and the input voltage of the voltage conversion unit 40 is supplied to the load 101 of the moving body 100. Therefore, even when the power supply apparatus 10 is abnormal, the power supply to the moving body 100 is not cut off, and the input voltage of the voltage conversion unit 40 is supplied to the moving body 100 without being boosted. When power supply from the power supply apparatus 10 to the moving body 100 is interrupted when the power supply apparatus 10 is abnormal, the load 101 of the mobile body 100 completely stops operating. On the other hand, in the power supply device 10 of the present embodiment, when an abnormality occurs, the input voltage of the voltage conversion unit 40 is supplied to the moving body 100 without being boosted, so that the input voltage is insufficient. However, the moving body 100 can be operated.

  Incidentally, the control unit 60 of the present embodiment determines whether the operation of the power supply apparatus 10 is normal by comparing the level of the output voltage V2 of the voltage conversion unit 40 and the output upper limit voltage. It may be determined whether or not the operation of the power supply apparatus 10 is normal from parameters other than the output voltage V2.

  For example, the control unit 60 may detect an abnormality of the power feeding apparatus 10 from the input voltage V1 and output current I1 of the voltage conversion unit 40, the ambient temperature of the power supply unit including the voltage conversion unit 40, the temperature of the transistor 43, and the like.

  First, a mode in which the control unit 60 determines whether or not the operation of the power feeding apparatus 10 is normal from the input voltage V1 of the voltage conversion unit 40 will be described.

  The power supply line 200 is passed through the hole of the C-shaped core of the power receiving coil 21, but when the position of the C-shaped core with respect to the power supply line 200 deviates from a specified position, the output voltage of the pickup unit 20, that is, the voltage conversion unit 40. The peak value of the input voltage V1 is out of the allowable voltage range. If the feed line 200 is too much inside the hole of the C-shaped core, the output voltage of the pickup unit 20 rises, and the peak value of the input voltage V1 of the voltage conversion unit 40 is the upper limit of the allowable voltage range. There is a possibility of exceeding the value (hereinafter referred to as the input upper limit voltage). When the peak value of the input voltage V1 exceeds the input upper limit voltage, a voltage exceeding the rating may be applied to circuit components such as the voltage conversion unit 40. On the other hand, when the feeder 200 is disconnected from the inside of the hole of the C-shaped core (that is, in the direction in which the number of magnetic fluxes interlinked) decreases, the output voltage of the pickup unit 20 decreases, and the peak value of the input voltage V1 is increased. There is a possibility that the value falls below the lower limit of the allowable voltage range (hereinafter referred to as the input lower limit voltage). When the peak value of the input voltage V1 falls below the input lower limit voltage, the voltage conversion unit 40 cannot boost the voltage to a predetermined voltage value, and stress may be applied to circuit components such as the voltage conversion unit 40.

  Here, when determining whether the operation of the power feeding apparatus 10 is normal or abnormal based on the input voltage V1 of the voltage conversion unit 40, the storage unit 61 stores the input upper limit of the input voltage V1 input to the voltage conversion unit 40. The voltage and the input lower limit voltage are registered as threshold values.

  The analog input port of the control unit 60 receives the input voltage V <b> 1 of the voltage conversion unit 40 (the voltage after full-wave rectification of the voltage input from the pickup unit 20 by the rectification unit 30). The controller 60 converts the input voltage V1 into a digital value at a predetermined cycle (time interval shorter than the cycle of the input voltage V1) by a built-in A / D converter (not shown), and takes the peak of the input voltage V1. Configured to retrieve values.

  When the control unit 60 takes in the peak value of the input voltage V1 of the voltage conversion unit 40, the control unit 60 compares the peak value of the input voltage V1 with the input upper limit voltage and the input lower limit voltage read from the storage unit 61, respectively. If the peak value of the input voltage V1 is equal to or lower than the input upper limit voltage and equal to or higher than the input lower limit voltage, the control unit 60 determines that the operation of the power supply apparatus 10 is normal and causes the voltage conversion unit 40 to perform normal boosting operation. To do. On the other hand, when the peak value of the input voltage V1 exceeds the input upper limit voltage or falls below the input lower limit voltage, the control unit 60 determines that the operation of the power supply apparatus 10 is abnormal, and similarly to the above, the transistor 43 Is turned off, and the voltage boosting operation by the voltage converter 40 is stopped. When the voltage conversion unit 40 stops the boosting operation, the input voltage V1 of the voltage conversion unit 40 is input to the load 101 as it is, so that power supply to the moving body 100 can be continued even when the power supply apparatus 10 is abnormal.

  As described above, when the input voltage V1 exceeds the input upper limit voltage, the control unit 60 turns off the transistor 43, so that the stress applied to the circuit components constituting the voltage conversion unit 40 can be reduced. Further, since the control unit 60 turns off the transistor 43 when the input voltage V1 falls below the input lower limit voltage, when the input voltage V1 is insufficient, the circuit components constituting the voltage conversion unit 40 perform an unreasonable operation. The possibility of doing so can be reduced.

  Further, the control unit 60 may determine whether or not the power feeding apparatus 10 or the moving body 100 is normal from the output current I1 of the voltage conversion unit 40. For example, when the load of the voltage conversion unit 40 becomes a light load as compared with the steady state, the output current I1 increases from the rated value, so that the control unit 60 detects an abnormality in the power feeding device 10 or the moving body 100 from the increase in the output current I1. Detect.

  In this case, in the storage unit 61, an output upper limit current that is an upper limit value of the output current I1 is registered in advance as a threshold for determining whether the operation of the power supply apparatus 10 or the moving body 100 is normal. An output signal of the current sensor 71 that measures the output current I1 (a signal obtained by converting the current signal into a voltage value when the output signal of the current sensor 71 is a current signal) is input to the analog input port of the control unit 60. . The controller 60 is configured to periodically convert the output signal of the current sensor 71 into a digital value using an A / D converter (not shown) built therein. The current sensor 71 includes, for example, a hall element and an amplifier circuit that amplifies the output of the hall element. The current sensor 71 is provided in an electric circuit that electrically connects the output terminal of the voltage converter 40 and the moving body 100, and measures an output current I1 flowing through the electric circuit. The current sensor 71 is not limited to a current sensor using a Hall element, and may be a current sensor using a current transformer or the like.

  The control unit 60 compares the current value of the output current I1 obtained from the output signal of the current sensor 71 with the output upper limit current read from the storage unit 61. If the current value of the output current I1 is equal to or lower than the output upper limit current, the control unit 60 determines that the operations of the power feeding apparatus 10 and the moving body 100 are normal, and causes the voltage conversion unit 40 to perform a normal boosting operation. . On the other hand, when the current value of the output current I1 exceeds the output upper limit current, the control unit 60 determines that an abnormality has occurred in the power supply apparatus 10 or the moving body 100, and turns off the transistor 43 in the same manner as described above to convert the voltage. The step-up operation of the unit 40 is stopped. When the voltage conversion unit 40 stops the boosting operation, the input voltage V1 of the voltage conversion unit 40 is input to the load 101 as it is, so that power supply to the moving body 100 is continued even when the power supply apparatus 10 or the moving body 100 is abnormal. be able to.

  The control unit 60 may determine whether the operations of the power supply apparatus 10 and the moving body 100 are normal or abnormal from the ambient temperature of the power supply unit 50 including the rectifying unit 30 and the voltage conversion unit 40.

  In this case, in the storage unit 61, an upper limit value of the ambient temperature of the power supply unit 50 (hereinafter referred to as a use upper limit temperature) is previously set as a threshold value for determining whether the operation of the power supply apparatus 10 and the moving body 100 is normal or abnormal. be registered. A temperature sensor 72 that measures the ambient temperature of the power supply unit 50 is electrically connected to the analog input port of the control unit 60. The temperature sensor 72 is made of, for example, a thermistor, and a temperature sensing unit is disposed around a substrate (not shown) on which the power supply unit 50 is mounted, and the ambient temperature of the power supply unit 50 (atmosphere in which the power supply unit 50 is used) The resistance value changes according to the temperature. The circuit is configured such that a constant voltage is applied to a series circuit of a resistor (not shown) having a fixed resistance value and a temperature sensor 72 composed of a thermistor, and the voltage generated between both ends of the temperature sensor 72 is controlled. The signal is input to the analog input port of the unit 60. Therefore, a voltage signal corresponding to the ambient temperature of the power supply unit 50 is input to the analog input port of the control unit 60, and this voltage signal is periodically received by an A / D converter (not shown). Converted to digital values and imported. The temperature sensor 72 is not limited to a thermistor and may be a resistance temperature detector, a thermocouple, or the like.

  The control unit 60 compares the ambient temperature of the power supply unit 50 obtained from the output of the temperature sensor 72 with the use upper limit temperature read from the storage unit 61. If the ambient temperature of the power supply unit 50 is equal to or lower than the upper limit temperature, the control unit 60 determines that the operation of the power supply apparatus 10 is normal and causes the voltage conversion unit 40 to perform a normal boosting operation. On the other hand, when the ambient temperature of the power supply unit 50 exceeds the use upper limit temperature, the control unit 60 determines that the operation of the power supply apparatus 10 is abnormal, turns off the transistor 43 as described above, and Stop the boosting operation. When the ambient temperature of the power supply unit 50 exceeds the use upper limit temperature, the control unit 60 stops the step-up operation by the voltage conversion unit 40, so that it is possible to reduce the thermal damage applied to the circuit components constituting the power supply unit 50. . Further, even when the power supply apparatus 10 is abnormal, the input voltage V <b> 1 of the voltage conversion unit 40 is input to the load 101 as it is, so that power supply to the moving body 100 can be continued.

  Further, the control unit 60 may determine whether the operation of the power supply apparatus 10 is normal or abnormal from the temperature of the transistor 43 provided in the voltage conversion unit 40.

  In this case, in the storage unit 61, an upper limit value of the temperature of the transistor 43 (hereinafter referred to as an element upper limit temperature) is registered in advance as a threshold value for determining whether the operation of the power supply apparatus 10 is normal. A temperature sensor 73 that measures the temperature of the transistor 43 is electrically connected to the analog input port of the control unit 60. The temperature sensor 73 is composed of, for example, a thermistor having a temperature sensing portion attached to the surface of the package of the transistor 43, and the resistance value changes according to the surface temperature of the package. The circuit is configured such that a constant voltage is applied to a series circuit of a resistor (not shown) having a fixed resistance value and a temperature sensor 73 formed of a thermistor, and the voltage generated between both ends of the temperature sensor 73 is controlled. The signal is input to the analog input port of the unit 60. Therefore, a voltage signal corresponding to the surface temperature of the package of the transistor 43 is input to the analog input port of the control unit 60, and this voltage signal is periodically received by an A / D converter (not shown). Are converted into digital values. The temperature sensor 73 is not limited to a thermistor, and may be a resistance temperature detector, a thermocouple, or the like.

  The control unit 60 compares the surface temperature of the transistor 43 obtained from the output of the temperature sensor 73 with the element upper limit temperature read from the storage unit 61. If the surface temperature of the transistor 43 is equal to or lower than the element upper limit temperature, the control unit 60 determines that the operation of the power feeding apparatus 10 is normal and causes the voltage conversion unit 40 to continue the boosting operation. On the other hand, when the surface temperature of the transistor 43 exceeds the element upper limit temperature, the control unit 60 determines that the operation of the power feeding apparatus 10 is abnormal, turns off the transistor 43 as described above, and boosts the voltage conversion unit 40. Stop operation. As described above, when the temperature of the transistor 43 exceeds the element upper limit temperature, the control unit 60 turns off the transistor 43, so that thermal damage applied to the transistor 43 can be reduced. Further, even when the power supply apparatus 10 is abnormal, the input voltage V <b> 1 of the voltage conversion unit 40 is input to the load 101 as it is, so that power supply to the moving body 100 can be continued.

  The control unit 60 may determine whether the operation of the moving body 100 is normal based on parameters acquired from the moving body 100 (current flowing through the load 101, operating voltage of the load 101, temperature, etc.). When the control unit 60 determines that the operation of the moving body 100 is abnormal, the control unit 60 turns off the transistor 43 and stops the voltage boosting operation of the voltage conversion unit 40. Thereby, the power supply to the mobile body 100 can be continued while protecting the voltage conversion unit 40.

  Based on a plurality of the above parameters (input voltage V1, output voltage V2, output current I1, temperature of power supply unit 50 and switching element, current of load 101, voltage, temperature, etc.), 10 or whether the operation of the moving body 100 is normal or abnormal. For example, the control unit 60 determines whether the operation of the power supply apparatus 10 is normal when the output voltage V2 of the voltage conversion unit 40 exceeds the output upper limit voltage or the ambient temperature of the power supply unit 50 exceeds the use upper limit temperature. You may judge.

  When the controller 60 detects an abnormality in the power supply apparatus 10 or the moving body 100, the controller 60 may store information indicating the content of the abnormality that has occurred in the storage unit 61. The control unit 60 may store information indicating the content of the abnormality that has occurred in the storage unit 61 together with information about the time at which the abnormality has occurred.

  When the control unit 60 detects an abnormality in the power supply apparatus 10 or the moving body 100, the control unit 60 may cause the output unit 62 to output information indicating the content of the abnormality that has occurred to the monitoring device 80. When the information indicating the content of the abnormality is input from the power supply device 10, the monitoring device 80 stores, for example, the information input from the power supply device 10 in a storage device (not illustrated), and a display device (not illustrated). Display a text message to notify the contents of the error. In addition, when information indicating the content of the abnormality is input from the power supply device 10, the monitoring device 80 may create a voice message notifying the content of the abnormality and output it from a speaker (not shown). 10 or the content of the abnormality that occurred in the moving body 100 can be notified.

  Further, when detecting an abnormality in the power supply apparatus 10 or the moving body 100, the control unit 60 causes the display unit 63 to display information indicating the content of the abnormality that has occurred. Since the display unit 63 is provided in the power supply device 10 in a state that is visible from the outside of the power supply device 10, the content of the abnormality that has occurred in the power supply device 10 or the moving body 100 is grasped from the display content of the display unit 63. Can do.

  Note that the control unit 60 may read information indicating the contents of abnormalities that have occurred in the past from the storage unit 61, transmit the read information from the output unit 62 to the monitoring device 80, or display the information on the display unit 63. Good.

  As described above, the non-contact power supply system of the present embodiment includes the power supply line 200 and the power supply apparatus 10. The power supply line 200 is arranged along the movement path of the moving body 100 including the load 101 that operates on electric power, and a high frequency current is supplied from a power source (high frequency power source 300). The power feeding apparatus 10 moves together with the moving body 100 and supplies power to the load 101. The power feeding device 10 includes a pickup unit 20, a rectifying unit 30, a voltage conversion unit 40, and a control unit 60. The pickup unit 20 includes a power receiving coil 21 that generates a voltage by electromagnetic induction when a magnetic flux generated around the power supply line 200 is linked. The rectifying unit 30 rectifies the output of the pickup unit 20. The voltage conversion unit 40 converts the voltage value by switching the output voltage of the rectification unit 30 with a semiconductor switching element (transistor 43), and supplies the voltage to the load 101. The control unit 60 controls the operation of the voltage conversion unit 40. The control unit 60 stops the switching operation of the semiconductor switching element and supplies the output voltage of the rectifying unit 30 to the load 101 when an abnormality occurs in at least one of the moving body 100 and the power feeding apparatus 10. Composed.

  As a result, when an abnormality occurs in at least one of the moving body 100 and the power supply apparatus 10, the switching operation of the voltage conversion unit 40 is stopped, and thus the circuit components constituting the voltage conversion unit 40 are protected. Can do. Even when the operation of the voltage converter 40 is stopped due to the occurrence of an abnormality, the output voltage of the rectifier 30 is supplied to the load 101, so that the load 101 is operated without interrupting the power supply to the load 101. be able to.

  In the non-contact power supply system of the present embodiment, the control unit 60 is configured to determine that the state in which the ambient temperature of the power supply unit 50 including the rectifying unit 30 and the voltage conversion unit 40 has exceeded the use upper limit temperature is abnormal. Also good. In a state where the ambient temperature of the power supply unit 50 exceeds the use upper limit temperature, the control unit 60 stops the switching operation of the semiconductor switching element, so that thermal stress applied to the circuit components constituting the power supply unit 50 can be reduced.

  In the contactless power supply system of the present embodiment, the control unit 60 may be configured to determine that the state in which the temperature of the semiconductor switching element (transistor 43) exceeds the element upper limit temperature is abnormal. In the state where the temperature of the semiconductor switching element exceeds the element upper limit temperature, the control unit 60 stops the switching operation of the semiconductor switching element, so that thermal stress applied to the semiconductor switching element can be reduced.

  In the contactless power supply system of the present embodiment, the control unit 60 may be configured to determine that the state in which the output voltage V2 of the voltage conversion unit 40 exceeds the output upper limit voltage is abnormal. In a state in which the output voltage V2 exceeds the output upper limit voltage, the control unit 60 stops the switching operation of the semiconductor switching element, so that it is difficult to supply an excessive voltage to the load 101.

  In the contactless power supply system of the present embodiment, the control unit 60 may be configured to determine that the state in which the output current I1 of the voltage conversion unit 40 exceeds the output upper limit current is abnormal. In a state where the output current I1 exceeds the output upper limit current, the control unit 60 stops the switching operation of the semiconductor switching element, so that it is difficult to supply an excessive current to the load 101.

  In the non-contact power supply system of the present embodiment, the control unit 60 may be configured to determine that the state in which the peak value of the input voltage V1 of the voltage conversion unit 40 is lower than the input lower limit voltage is abnormal. In a state where the peak value of the input voltage V1 of the voltage conversion unit 40 is lower than the input lower limit voltage, that is, a state where the input voltage V1 of the voltage conversion unit 40 is insufficient, the control unit 60 stops the switching operation of the semiconductor switching element. ing. Therefore, the possibility that the circuit components constituting the voltage conversion unit 40 perform an unreasonable operation is reduced.

  In the non-contact power supply system of the present embodiment, the control unit 60 may be configured to determine that the state in which the peak value of the input voltage V1 of the voltage conversion unit 40 exceeds the input upper limit voltage is abnormal. When the peak value of the input voltage V1 of the voltage conversion unit 40 exceeds the input upper limit voltage, that is, when the input voltage V1 of the voltage conversion unit 40 is excessive, the control unit 60 stops the switching operation of the semiconductor switching element. . Therefore, the stress applied to the circuit components constituting the voltage conversion unit 40 can be reduced.

  In the non-contact power supply system of the present embodiment, the power supply apparatus 10 includes an output unit 62 that outputs the content of the abnormality that has occurred to the outside when the control unit 60 stops the switching operation of the semiconductor switching element when the abnormality occurs. Also good. Since the output unit 62 outputs the content of the abnormality that has occurred, the external device that has acquired the content output from the output unit 62 uses the content of the abnormality that has occurred in the power supply apparatus 10 or the moving body 100. be able to.

  In the non-contact power supply system of the present embodiment, the power supply apparatus 10 may include a display unit 63 that displays details of the abnormality that has occurred when the control unit 60 stops the switching operation of the semiconductor switching element when the abnormality occurs. . The administrator of the non-contact power supply system allows the display unit 63 to grasp the content of the abnormality that has occurred from the display content of the display unit 63.

  In the non-contact power supply system of the present embodiment, the power supply apparatus 10 may include a storage unit 61 that stores the content of the abnormality that has occurred when the control unit 60 stops the switching operation of the semiconductor switching element when the abnormality occurs. . The administrator of the non-contact power supply system can grasp the content of the abnormality that occurred in the past based on the content stored in the storage unit 61.

  In the above embodiment, the voltage conversion unit 40 is a step-up chopper circuit. However, the voltage conversion unit 40 may be a step-down chopper circuit (not shown), and the control unit 60 performs semiconductor switching of the step-down chopper circuit when an abnormality occurs. The switching operation of the element may be stopped. In the step-down chopper circuit, semiconductor switching elements are connected in series between the input terminal and the output terminal, so that a switching element (not shown) that bypasses between the input terminal and the output terminal of the step-down chopper circuit is required. The control unit 60 turns off the switch element in a state where no abnormality has occurred, and causes the step-down chopper circuit to perform a normal step-down operation. On the other hand, when an abnormality occurs, the control unit 60 protects the voltage conversion unit 40 by turning off the semiconductor switching element of the step-down chopper circuit and stopping the step-down operation. Moreover, the control part 60 is supplying the input voltage of the voltage conversion part 40 to the moving body 100 as it is by turning on a switch element at the time of abnormality occurrence, and can continue the electric power supply to the moving body 100. FIG.

  In addition, said structure is only an example of this invention, and this invention is not limited to said embodiment, If it is the range which does not deviate from the technical idea which concerns on this invention even if it is other than this embodiment. Various changes can be made depending on the design.

DESCRIPTION OF SYMBOLS 10 Electric power feeder 20 Pickup part 21 Power receiving coil 30 Rectification part 40 Voltage conversion part 43 Transistor (semiconductor switching element)
60 Control Unit 100 Moving Body 101 Load 200 Feeding Line 300 High Frequency Power Supply

Claims (8)

A power supply line that is arranged along a moving path of a moving body having a load that operates on electric power and that is supplied with a high-frequency current from a power source;
A power supply device that moves with the mobile body and supplies power to the load;
The power supply device includes a pickup unit including a power receiving coil that generates a voltage by electromagnetic induction due to interlinking of magnetic flux generated around the power supply line, a rectifying unit that rectifies an output of the pickup unit, and the rectifying unit A voltage conversion unit that converts a voltage value by switching the output voltage of the semiconductor switching element and supplies the voltage to the load, a control unit that controls the operation of the voltage conversion unit, and an output unit,
The controller stops the switching operation of the semiconductor switching element and supplies the output voltage of the rectifier to the load when an abnormality occurs in at least one of the moving body and the power feeding device. Composed of
When the control unit stops the switching operation of the semiconductor switching element when an abnormality occurs, the output unit outputs the content of the abnormality that has occurred to an external device ,
Wherein, the non-contact power supply system in which the peak value of the input voltage of the voltage converter is characterized Rukoto configured to determine an abnormal state below the input lower limit voltage.   The non-control unit according to claim 1, wherein the control unit is configured to determine that a state in which an ambient temperature of a power supply unit including the rectification unit and the voltage conversion unit exceeds a use upper limit temperature is abnormal. Contact power supply system.   The non-contact power feeding system according to claim 1, wherein the control unit is configured to determine that the state in which the temperature of the semiconductor switching element exceeds the element upper limit temperature is abnormal.   The non-contact according to any one of claims 1 to 3, wherein the control unit is configured to determine that the output voltage of the voltage conversion unit exceeds an output upper limit voltage as abnormal. Power supply system.   The non-contact according to any one of claims 1 to 4, wherein the control unit is configured to determine that the output current of the voltage conversion unit exceeds an output upper limit current as abnormal. Power supply system.   6. The control unit according to claim 1, wherein the control unit is configured to determine that a state in which a peak value of an input voltage of the voltage conversion unit exceeds an input upper limit voltage is abnormal. Contactless power supply system.   7. The power feeding device according to claim 1, further comprising a display unit configured to display a content of the abnormality that has occurred when the control unit stops the switching operation of the semiconductor switching element when the abnormality occurs. The non-contact power feeding system according to item 1.   8. The power feeding device according to claim 1, further comprising a storage unit that stores contents of the abnormality that has occurred when the control unit stops the switching operation of the semiconductor switching element when the abnormality occurs. The non-contact power feeding system according to item 1.

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