Abstract: An insulation resistance detection device detects a voltage at a connection point between a coupling capacitor and a resistance in the case where a frequency signal is outputted to the resistance, and detects an insulation resistance between a ground portion and a power supply path based on a moving average value of a detection voltage. The insulation resistance detection device includes a first determination unit, a resistance detection unit, and a second determination unit. In response to a determination that the pulsation of the detection voltage is attenuated, the resistance detection unit detects the insulation resistance based on, instead of a first moving average value, a second moving average value calculated by using the detection voltage in a second range including a smaller number of detection voltages than in the first range.

Abstract: A power converter has a capacitor and a power conversion unit having a series-connected unit composed of an upper arm side switching element and a lower arm side switching element. The capacitor is connected in parallel with the serios connection unit. The power conversion unit supplies electric power to a motor. A controller for the power conversion unit has a frequency characteristics estimation part estimating frequency characteristics of a battery current of the battery when a current is flowing between the power convertor and the battery, a ripple current setting part determining a ripple frequency of a ripple current contained in the battery current based on the frequency characteristics of the battery current, and a control part performing a switching control of the switching elements based on the ripple frequency in order to generate the ripple current.

Abstract: In an insulation resistance detection apparatus, a voltage determiner determines whether a detection voltage, which has changed by at least a preset value, becomes stable at around a changed voltage value. A resistance determiner determines a value of an insulation resistance between a ground portion and a power-supply path based on a currently sampled value of the detection voltage instead of a moving average in response to determination that the detection voltage, which has changed by at least the preset value, becomes stable at around the changed voltage value.

Abstract: An inner core portion includes an inner gap having a length in the first direction larger than that of the outer gap in a center in the first direction. A control device is configured to switch between a one-phase operation of causing a current to flow through any one of the first outer coil, the second outer coil, and the inner coil to operate, a two-phase operation of causing a current to flow through any two of the first outer coil, the second outer coil, and the inner coil to operate, and a three-phase operation of causing a current to flow through all of the first outer coil, the second outer coil, and the inner coil to operate. The control device selects the inner coil in the one-phase operation.

Abstract: An electric power conversion device of an embodiment includes: a primary side negative electrode terminal; a secondary side negative electrode terminal; a negative electrode terminal of a switching element connected between the primary side negative electrode terminal and the secondary side negative electrode terminal; a first conductive member connected to the primary side negative electrode terminal; a second conductive member connected to the negative electrode terminal of the switching element; and a third conductive member connected to the secondary side negative electrode terminal, wherein the first conductive member, the second conductive member, and the third conductive member are connected to one another, and the first conductive member is formed as a separate body separately from the second conductive member and the third conductive member.

Abstract: A control device, for a power conversion device using a three-phase magnetic coupling reactor, includes: a first outer coil; a second outer coil; an inner coil disposed between the first outer coil and the second outer coil; and a core including a first outer core portion around which the first outer coil is wound, a second outer core portion around which the second outer coil is wound, and an inner core portion around which the inner coil is wound. Directions of magnetic fluxes generated in the first outer coil, the second outer coil, and the inner coil are opposite to each other in any combination. In a three-phase operation, the control device controls a value of the current flowing through the inner coil so as to approach values of the currents flowing through the first outer coil and the second outer coil.

Abstract: A control device, for a power conversion device using a three-phase magnetic coupling reactor, includes: a first outer coil; a second outer coil; an inner coil disposed between the first outer coil and the second outer coil; and a core including a first outer core portion around which the first outer coil is wound, a second outer core portion around which the second outer coil is wound, and an inner core portion around which the inner coil is wound. Directions of magnetic fluxes generated in the first outer coil, the second outer coil, and the inner coil are opposite to each other in any combination. In a three-phase operation, the control device controls a value of the current flowing through the inner coil so as to approach values of the currents flowing through the first outer coil and the second outer coil.

Abstract: An electrical leakage determination system determines if an electrical leakage occurs between each of power supply paths and a grounding section. The electrical leakage determination system includes a coupling capacitor with one end connected to an anode-side power supply path, a resistor connected to the other end of the coupling capacitor, and an oscillator connected to the resistor to output an AC voltage to the resistor. A determiner detects a voltage at a connection point located between the coupling capacitor and the resistor when the oscillator outputs an AC voltage to the resistor. The determiner determines if the electrical leakage occurs based on the detected voltage. The oscillator increases an absolute value of an AC voltage output during a preparation period provided prior to a detection timing when a voltage is detected at a connection point greater than an absolute value of an AC voltage output at the detection timing.

Abstract: An electrical leakage determination system that determines if an electrical leakage occurs includes a capacitor having first and second ends connected to a cathode side power supply path and a grounding section and a switch disposed in an electrical path formed parallel to the capacitor. When the capacitor discharges and a predetermined period has elapsed after the controller sets an energized state between the cathode-side power supply path and the grounding section by bringing the switch to an energizing position, the controller allows the capacitor to charge by setting an energization shut down state between the cathode-side power supply path and the grounding section by bringing the switch to an energization shut down position. The controller subsequently detects a voltage value of the capacitor and determines if the electrical leakage is either present or absent based on the voltage value.

Abstract: In an insulation resistance detection apparatus, a voltage determiner determines whether a detection voltage, which has changed by at least a preset value, becomes stable at around a changed voltage value. A resistance determiner determines a value of an insulation resistance between a ground portion and a power-supply path based on a currently sampled value of the detection voltage instead of a moving average in response to determination that the detection voltage, which has changed by at least the preset value, becomes stable at around the changed voltage value.

Abstract: An insulation resistance detection device detects a voltage at a connection point between a coupling capacitor and a resistance in the case where a frequency signal is outputted to the resistance, and detects an insulation resistance between a ground portion and a power supply path based on a moving average value of a detection voltage. The insulation resistance detection device includes a first determination unit, a resistance detection unit, and a second determination unit. In response to a determination that the pulsation of the detection voltage is attenuated, the resistance detection unit detects the insulation resistance based on, instead of a first moving average value, a second moving average value calculated by using the detection voltage in a second range including a smaller number of detection voltages than in the first range.

Abstract: An electric power conversion device is provided with a case (60) which includes: a first member (61) having a first region (73) defining therein a first passage (78, 79) in which a cooling medium flows, and a second region (74) disposed on a side of the first region; and a second member (88) disposed so as to at least partly overlap with the second region as seen from a direction orthogonal to the second region in a spaced apart relationship to the second region, and internally defining a second passage (91) connected to the first passage. A reactor (31) is positioned in the first region, and a switching device (33) is positioned on the surface of the second member facing away from the first member while a capacitor (35) is positioned between the second member and the second region of the first member.

Abstract: A drive circuit drives switches that are connected to each other in parallel. The drive circuit includes individual discharge paths, a common discharge path, blocking units, a discharge switch, off-holding switches, and a drive control unit. The drive control unit selects, as target switches to be driven to be turned on, at least two switches among the switches. The at least two switches include a first switch and a second switch. The first switch is last to be switched to an off-state among the at least two switches that are selected as the target switches and switched to an on-state. The second switch is other than the first switch among the at least two switches. The off-holding switches includes a first off-holding switch and a second off-holding switch. After switching the second off-holding switch to an on-state, the drive control unit switches the discharge switch to an on-state.

Abstract: An electric power conversion device is provided with a case (60) including a mounting portion (61) extending along a plane defined by a first direction and a second direction that are orthogonal to each other, and a side wall (62) provided along a periphery of the mounting portion, a primary side connection portion (23) and a secondary side connection portion (27) provided on the case, a plurality of reactors arranged along the second direction in the case and connected in parallel to one another, and a switching unit including a plurality of switching devices positioned in the case on one side of the reactors in the first direction, arranged along the first direction, and respectively connected to the reactors.

Abstract: An electrical leakage determination system determines if an electrical leakage occurs between each of power supply paths and a grounding section. The electrical leakage determination system includes a coupling capacitor with one end connected to an anode-side power supply path, a resistor connected to the other end of the coupling capacitor, and an oscillator connected to the resistor to output an AC voltage to the resistor. A determiner detects a voltage at a connection point located between the coupling capacitor and the resistor when the oscillator outputs an AC voltage to the resistor. The determiner determines if the electrical leakage occurs based on the detected voltage. The oscillator increases an absolute value of an AC voltage output during a preparation period provided prior to a detection timing when a voltage is detected at a connection point greater than an absolute value of an AC voltage output at the detection timing.

Abstract: A drive circuit drives switches that are connected to each other in parallel. The drive circuit includes individual discharge paths, a common discharge path, blocking units, a discharge switch, off-holding switches, and a drive control unit. The drive control unit selects, as target switches to be driven to be turned on, at least two switches among the switches. The at least two switches include a first switch and a second switch. The first switch is last to be switched to an off-state among the at least two switches that are selected as the target switches and switched to an on-state. The second switch is other than the first switch among the at least two switches. The off-holding switches includes a first off-holding switch and a second off-holding switch. After switching the second off-holding switch to an on-state, the drive control unit switches the discharge switch to an on-state.

Abstract: An electrical leakage determination system that determines if an electrical leakage occurs includes a capacitor having first and second ends connected to a cathode side power supply path and a grounding section and a switch disposed in an electrical path formed parallel to the capacitor. When the capacitor discharges and a predetermined period has elapsed after the controller sets an energized state between the cathode-side power supply path and the grounding section by bringing the switch to an energizing position, the controller allows the capacitor to charge by setting an energization shut down state between the cathode-side power supply path and the grounding section by bringing the switch to an energization shut down position. The controller subsequently detects a voltage value of the capacitor and determines if the electrical leakage is either present or absent based on the voltage value.

Abstract: An electric power conversion device is provided with a case (60) including a mounting portion (61) extending along a plane defined by a first direction and a second direction that are orthogonal to each other, and a side wall (62) provided along a periphery of the mounting portion, a primary side connection portion (23) and a secondary side connection portion (27) provided on the case, a plurality of reactors arranged along the second direction in the case and connected in parallel to one another, and a switching unit including a plurality of switching devices positioned in the case on one side of the reactors in the first direction, arranged along the first direction, and respectively connected to the reactors.

Abstract: An electric power conversion device is provided with a case (60) which includes: a first member (61) having a first region (73) defining therein a first passage (78, 79) in which a cooling medium flows, and a second region (74) disposed on a side of the first region; and a second member (88) disposed so as to at least partly overlap with the second region as seen from a direction orthogonal to the second region in a spaced apart relationship to the second region, and internally defining a second passage (91) connected to the first passage. A reactor (31) is positioned in the first region, and a switching device (33) is positioned on the surface of the second member facing away from the first member while a capacitor (35) is positioned between the second member and the second region of the first member.

Abstract: A semiconductor device turns on and off a power switching device having a gate terminal and output terminals between which an output current is produced by a gate voltage applied to the gate terminal. The semiconductor device includes: an output current detector detecting a current value correlated with the output current; a voltage detector detecting a voltage across the output terminals of the power switching device; a clamp circuit clamping the gate voltage at a predetermined value; and a controller controlling the clamp circuit to adjust the gate voltage based on the voltage detected by the voltage detector. The controller controls the clamp circuit to set the gate voltage to be at a minimum voltage according to the detected voltage to cause the output current to be larger than a threshold current required for detecting the short circuit in the power switching device.