Abstract: The present invention can achieve stable transition between high-side and low-side power. A DC/DC converter is provided with a control unit and a main circuit including a switching circuit, and the control unit is provided with three control modes for transition between voltage levels, namely: a first mode in which a transition period between a pre-transition power level and a post-transition power level is implemented by means of constant-current control, a third mode in which a retention period for holding the voltages of the pre-transition power level and the post-transition power level is implemented by means of constant-voltage control, and a second mode in which a buffer period from the transition period to the retention period is implemented by means of constant-voltage control. The three modes are repeated in sequence so that a direct-current input is converted to and output as high-frequency pulses at a plurality of different voltage levels.

Abstract: Multi-phase interleaving control in a power supply device is accelerated. In addition, in accelerating the multi-phase interleaving control in the power supply device, acceleration in detecting a feedback signal and stabilization of a control system in a high-frequency band are promoted. Eliminating the need of the feedback signal according to a slow response detector, and using a detection signal obtained by a detector for detecting an AC signal capable of rapid response, thereby accelerating the multi-phase interleaving control in the power supply device. Then, the control system is stabilized, by satisfying a condition where gain is equal to 1 or less in a transfer function of the control system including an LC circuit, and a condition where a phase shift caused by dead time of switching time does not affect the sampling cycle.

Abstract: Provided is a technique for detecting a vehicle type and a traveling direction of a vehicle by an electromagnetic induction sensor. A sensor unit (10), which is an electromagnetic induction sensor, includes a transmission coil (TX1), a first reception coil (RX1), and a second reception coil (RX2). A magnetic field of a vehicle (90) made of steel attracts a magnetic field emitted from the transmission coil (TX1) (S1). As the vehicle (90) approaches, a state 1 indicated by the broken line changes to a state 2 indicated by the dash-dot line (S2). A reduction in induced voltage and a phase change occur with respect to the induced voltage when the first reception coil (RX1) is in the magnetic field of state 1 (when the vehicle is not detected) (S3). The differential output signals of the second reception coil RX2 and the first reception coil RX1 change according to the advancement of the vehicle and according to the unevenness of the vehicle bottom portion 92 and the metal species (S4).

Abstract: Multi-phase interleaving control of a power supply device is accelerated. Furthermore, in accelerating the multi-phase interleaving control in the power supply device, detection of feedback signal is accelerated. In the power supply device and a method for controlling the power supply device, output voltage is acquired as an operation result of a discrete time process using an initial value of the output voltage at a predetermined point, and a detection value of capacitance current at each point of the discrete time process. Accordingly, only detection of the initial value is performed when the output voltage being slow in response is acquired, and detection performed in the discrete time process can be accomplished by detection of capacitance current being rapid in response, thus enabling rapid response.

Abstract: When there is a train entering a building of a rail yard, a ground apparatus stores vehicle-formation-set IDs of respective vehicle-formation-sets of the train in the entering order by a FILO method. Additionally, when there is the train leaving the building, the vehicle-formation-set IDs are sequentially read by the FILO method, an inquiry addressed to the vehicle-formation-set IDs is transmitted in the order of the reading to obtain the train information from the on-board apparatus of each of the vehicle-formation-sets forming the train. When the on-board apparatus does not respond to the inquiry, and obtaining of the train information fails, the ground apparatus performs a predetermined alarm output control.

Abstract: A swing body engages with a driving end roller of a linearly moved driving slider at a driving end section. The swing body engages with a guide groove in a driven slider at a driven end section. The driven slider is coupled to a gap filler plate by a driven end roller changeable in installation position in a predetermined direction. A gap filler has an inverse motion preventive structure that, when the gap filler plate is in either a fully protruded state or a fully stored state, enables only forward motion transfer from the driving slider to the swing body. The guide groove is formed in a direction orthogonal or almost orthogonal to forward and backward movement directions of the gap filler plate. The predetermined direction and the direction of the guide groove are parallel to each other in the fully stored state.

Abstract: A first link mechanism section converts linear motion of a driving slider into swing motion of a swing end roller. A second link mechanism section swings in cooperation with the swing end roller on a roller contact surface of a second link lever section, and an output end roller changeable in attachment position presses a driven slider fixed to a gap filler plate. In a fully protruded state and a fully stored state of the gap filler plate, the direction of acting force of the roller contact surface pressing the swing end roller aligns with a straight line connecting the swing end roller and a swing shaft of a first link lever section.

Abstract: A first ground apparatus performs polling communication with a train using a first train list. A second ground apparatus performs polling communication with a train using a second train list. Each ground apparatus respectively acquires train location information from the trains to be managed. The first ground apparatus notifies the second ground apparatus of a going-out notification of a boundary passing train that goes out from a first radio communication control region and comes in a second radio communication control region, and, in the case where the boundary passing train goes out from the first radio communication control region, deletes train identification information of the boundary passing train from the first train list. The second ground apparatus adds the train identification information of the boundary passing train to the second train list in the case where the going-out notification is input from the first ground apparatus.

Abstract: Provided is multi-phase interleaving control in a power supply device, the control allowing the pulse widths ?T of respective phases to overlap one another, so as to be adaptable to wideband pulse power control. In applying dead beat control to the multi-phase interleaving, constant current control is performed using combined current of the respective phase current values, and the pulse widths ?T(k) is computed under this constant current control, thereby preventing variation of the pulse widths ?T(k) between the phases, and achieving stable power control. Accordingly, the pulse power control becomes adaptable to wideband. Furthermore, wideband control is possible also in two-level pulse power control that performs control by switching at high frequency between High-level power and Low-level power.

Abstract: A first link mechanism section converts linear motion of a driving slider into swing motion of a swing end roller, and swings the swing end roller in cooperation with a second link mechanism section. An output end roller of the second link mechanism section engages in a guide groove in a driven slider fixed to a gap filler plate to move the gap filler plate linearly. In a fully protruded state and a fully stored state of the gap filler plate, the direction of acting force of the roller contact surface pressing the swing end roller aligns with a straight line connecting the swing end roller and a swing shaft of a first link lever section to act as a lock. The guide groove is formed orthogonal or almost orthogonal to movement directions of the gap filler plate.

Abstract: Provided is multi-phase interleaving control in a power supply device. In power control by the power supply device where the dead beat control is applied to the multi-phase interleaving, combined current of the multi-phase current values is used as control current in the multi-phase control based on the multi-phase interleaving, thereby achieving control independent of the number of the detectors and the control system independent of the number of phases, and further, this control current is used to perform constant current control, so as to prevent overshooting and undershooting. The power supply device has multi-phase interleaving control that performs multi-phase control using a plurality of phase current values, provided with an LC chopper circuit constituting a step-down chopper circuit that operates according to the multi-phase control of multi-phase interleaving, and a controller for performing step response control according to the multi-phase control of the LC chopper circuit.

Abstract: Multi-phase interleaving control of a power supply device is accelerated. Furthermore, in accelerating the multi-phase interleaving control in the power supply device, detection of feedback signal is accelerated. In the power supply device and a method for controlling the power supply device, output voltage is acquired as an operation result of a discrete time process using an initial value of the output voltage at a predetermined point, and a detection value of capacitance current at each point of the discrete time process. Accordingly, only detection of the initial value is performed when the output voltage being slow in response is acquired, and detection performed in the discrete time process can be accomplished by detection of capacitance current being rapid in response, thus enabling rapid response.

Abstract: A chopper section of a power supply device includes a plurality of step-down chopper circuits, and multiphase control of the step-down chopper circuits is performed using gate signals having phases displaced from each other. This shortens the period with which output signals of the step-down chopper circuits are changed. Shortening the period reduces the amount of jitter resulting from a gap between the occurrence of a command signal and a sampling point that is a point in time at which a gate signal is generated. The number of phases of the gate signals equals the number of phases of the step-down chopper circuits. The control of the gate signal generator is asynchronous to feedback control by the controller. Points in time (sampling points) at which gate signals are generated are points in time of generation (sampling points) after a point in time at which the controller calculates a manipulated value.

Abstract: In a ground apparatus system, polling communication where a ground apparatus serves as a primary station and a train serves as a secondary station is performed. A ground apparatus that is a ground apparatus of the ground apparatus system and is capable of communicating with a platform screen door control apparatus performs polling communication at a first communication frequency to obtain train location information from the train. When the train reaches an impending arrival range including a stop position at a station, the ground apparatus switches the communication frequency to a second communication frequency higher than the first communication frequency. The apparatus then transmits, to the train through polling communication, synchronized opening and closing control instruction information received from the platform screen door control apparatus, and transmits, to the platform screen door control apparatus, train state information obtained from the train through polling communication.

Abstract: A ground apparatus system performs polling communication in which ground apparatuses are set as primary stations and trains are set as secondary stations. The ground apparatus stores a train list of train IDs of trains to be managed. The ground apparatus acquires, train information including train location information from the train to determine a train location of each train included in the train list. The ground apparatus calculates a coming-in allowable range of each train to generate traveling control information, and transmits the traveling control information to the train. The ground apparatus updates the train list by adding a train ID of a train that comes in a radio communication control region of the ground apparatus and deleting a train ID of a train that goes out from the radio communication control region by performing handover control of the trains to be managed with an adjacent ground apparatus.

Abstract: In frequency control where impedance matching is performed by frequency sweep in an RF power supply device, a frequency sweep direction is specified, allowing a reflection coefficient and/or reflected power to move to a minimum, whereby it is possible to reduce a time length required until detecting the frequency that enables the reflection coefficient and/or the reflected power to be minimized. The frequency control for impedance matching in the RF power supply device is performed according to the following two-stage control; A) phase control that specifies the frequency sweep direction that allows the reflection coefficient and/or the reflected power to move to a minimum, based on the phase state of oscillating frequency, and that starts increasing or decreasing the frequency in thus specified sweep direction; and B) reflected power control where the reflection coefficient or the reflection amount is used as a control end condition for completing the frequency control.

Abstract: To suppress a leakage current flowing through a parasitic capacitor of an insulated transformer of a high-side insulated power. The present invention suppresses a common mode current using a common mode reactor by focusing on the fact that a leakage current flowing through a parasitic capacitor of an insulated transformer of a high-side insulated power source resulting from a high-frequency signal generated due to an on/off operation of a high-side switching element is the common mode current. The common mode reactor reduces the common mode current and bears the high-frequency signal to prevent the high-frequency signal from being applied to the insulated transformer of the high-side insulated power source, suppress the leakage current flowing through the parasitic capacitor of the insulated transformer, and reduce an erroneous operation of the high-side switching element generated due to the leakage current flowing through the parasitic capacitor of the insulated transformer.

Abstract: A chopper section of a power supply device includes a plurality of step-down chopper circuits, and multiphase control of the step-down chopper circuits is performed using gate signals having phases displaced from each other. This shortens the period with which output signals of the step-down chopper circuits are changed. Shortening the period reduces the amount of jitter resulting from a gap between the occurrence of a command signal and a sampling point that is a point in time at which a gate signal is generated. The number of phases of the gate signals equals the number of phases of the step-down chopper circuits. The control of the gate signal generator is asynchronous to feedback control by the controller. Points in time (sampling points) at which gate signals are generated are points in time of generation (sampling points) after a point in time at which the controller calculates a manipulated value.

Abstract: Multi-phase interleaving control in a power supply device is accelerated. In addition, in accelerating the multi-phase interleaving control in the power supply device, acceleration in detecting a feedback signal and stabilization of a control system in a high-frequency band are promoted. Eliminating the need of the feedback signal according to a slow response detector, and using a detection signal obtained by a detector for detecting an AC signal capable of rapid response, thereby accelerating the multi-phase interleaving control in the power supply device. Then, the control system is stabilized, by satisfying a condition where gain is equal to 1 or less in a transfer function of the control system including an LC circuit, and a condition where a phase shift caused by dead time of switching time does not affect the sampling cycle.

Abstract: In frequency control where impedance matching is performed by frequency sweep in an RF power supply device, a frequency sweep direction is specified, allowing a reflection coefficient and/or reflected power to move to a minimum, whereby it is possible to reduce a time length required until detecting the frequency that enables the reflection coefficient and/or the reflected power to be minimized. The frequency control for impedance matching in the RF power supply device is performed according to the following two-stage control; A) phase control that specifies the frequency sweep direction that allows the reflection coefficient and/or the reflected power to move to a minimum, based on the phase state of oscillating frequency, and that starts increasing or decreasing the frequency in thus specified sweep direction; and B) reflected power control where the reflection coefficient or the reflection amount is used as a control end condition for completing the frequency control.