Abstract: An electric compressor includes a housing, an inverter, an inverter case, a case bottom wall, and a case peripheral wall. The inverter case has a seal peripheral wall. The seal peripheral wall has a cylindrical shape and extends from the case bottom wall in a direction opposite to a direction in which the case peripheral wall extends. The seal peripheral wall surrounds a part of an outer peripheral surface of the housing. A seal member having an annular shape seals a gap between an inner peripheral surface of the seal peripheral wall and the outer peripheral surface of the housing.

Abstract: A switch system includes a bidirectional switch, a first gate driver circuit, a second gate driver circuit, a control unit, a first decision unit, and a second decision unit. The bidirectional switch includes a first source, a second source, a first gate, and a second gate. The first decision unit determines, based on a voltage at the first gate and a first threshold voltage, a state of the first gate in a first period in which a signal to turn OFF the first gate is output from the control unit to the first gate driver circuit. The second decision unit determines, based on a voltage at the second gate and a second threshold voltage, a state of the second gate in a second period in which a signal to turn OFF the second gate is output from the control unit to the second gate driver circuit.

Abstract: A fluid machine includes an inverter compartment defined by a housing and a cover, the inverter compartment accommodating an inverter, and a wire electrically connected to an external connector and supplying power to a circuit board of the inverter. The wire includes a board coupling portion electrically connected to the circuit board, a connector coupling portion electrically connected to the external connector, and an extended portion extending along a wall surface of the cover and connecting the board coupling portion and the connector coupling portion. The fluid machine further includes a plastic mold covering the extended portion, and an anchor formed integrally with the plastic mold and engaged with a through-hole of the cover. The extended portion is held on the wall surface of the cover by the anchor.

Abstract: A motor-driven compressor includes a compression portion, an electric motor, an inverter, and a metal housing. The inverter includes three-phase switching elements and a plastic holder that retains the three-phase switching elements. The housing includes a thermal radiation surface. The holder includes a metal spring. The holder is fixed to the housing using two fasteners. The three-phase switching elements are laid out between the two fasteners. The switching elements at opposite ends of the three-phase switching elements are pressed toward the thermal radiation surface by only the holder. The switching element at the middle of the three-phase switching elements is pressed toward the thermal radiation surface by the holder and the spring.

Abstract: A bidirectional switch module includes a plurality of bidirectional switches and a mount board. Each of the plurality of bidirectional switches includes a first source electrode, a first gate electrode, a second gate electrode, and a second source electrode. On the mount board, the plurality of bidirectional switches are mounted. In the bidirectional switch module, the plurality of bidirectional switches are connected in parallel.

Abstract: A semiconductor device includes: a substrate; a first nitride semiconductor layer above the substrate; a second nitride semiconductor layer above the first nitride semiconductor layer and being greater than the first nitride semiconductor layer in band gap; and a first field-effect transistor including a first source electrode, a first drain electrode, and a first gate electrode that are above the second nitride semiconductor layer, the first source electrode and the first drain electrode being separated from each other, the first gate electrode being disposed between the first source electrode and the first drain electrode. The first field-effect transistor includes a third semiconductor layer that is above the second nitride semiconductor layer in part of a region between lower part of the first source electrode and the first gate electrode, and is separated from the first gate electrode. The third semiconductor layer and the first source electrode are electrically connected.

Abstract: An inertia measurement device, which is used in combination with a satellite positioning receiver that outputs a positioning result at every T seconds in a positioning system equipped on a vehicle, when a Z-axis angular velocity sensor, a position error P[m] based on the detection signal of the Z-axis angular velocity sensor while the vehicle moves at a moving speed V[m/sec] for T seconds satisfies Pp?P=(V/Bz)×(1?cos(Bz×T)) (where, a bias error of the Z-axis angular velocity sensor is Bz[deg/sec] and a predetermined allowable maximum position error during movement for T seconds is Pp[m]), and a bias error Bx and By of the Y-axis angular velocity sensor satisfies Bz<Bx and Bz<By.

Abstract: A motor-driven compressor includes a rotary shaft, an electric motor, a compression unit, an inverter, a housing, and an inverter case. The housing includes a housing end wall and a housing circumferential wall, which extends from a housing end wall in an axial direction of the rotary shaft. The inverter case includes a case end wall, which extends in the axial direction from the case end wall. The seal circumferential wall includes a proximal end connected to the case end wall and an end face located at a distal end. The housing circumferential wall includes an opposed surface that is opposed to the end face. An annular seal member is provided between the seal circumferential wall and the housing circumferential wall. The seal member extends in a radial direction of the rotary shaft between the end face and the opposed surface.

Abstract: An electric compressor includes an inverter, a housing with an opening, an inverter connector, a power connector, and a cable that electrically connects both connectors. The housing accommodates the inverter. The inverter connector includes a cover, an outer sealing member, and an inner sealing member. The cover includes an insertion hole through which the cable is inserted, and is disposed in the opening so as to position the cable in the opening. The outer sealing member is interposed between the opening and the cover. The inner sealing member is interposed between the insertion hole and the cable. The insertion hole includes a restriction portion that restricts a movement of the cable, and a fitting portion that is located closer to the inverter than the restriction portion and in which the inner sealing member is fitted. The insertion hole is narrower at the restriction portion than at the fitting portion.

Abstract: A gate drive circuit includes: an input terminal; a first circuit path inserted into a line connecting the input terminal and a gate of a power transistor; a second circuit path connected in parallel to the first circuit path; and a third circuit path connected in parallel to the second circuit path. The first circuit path includes a gate resistor (Rgon). The second circuit path includes a first capacitor and a first resistor connected in series. The third circuit path includes a second capacitor and a second resistor connected in series. The second capacitor has a capacitance value greater than a capacitance value of the first capacitor. The second resistor has a resistance value greater than a resistance value of the first resistor. The gate resistor (Rgon) has a resistance value greater than the resistance value of the second resistor.

Abstract: A speed-up circuit is configured to be provided between a power supply terminal and a gate of a semiconductor switching element. An impedance element is configured to be provided between a signal input terminal and a node, the node being between the speed-up circuit and the gate of the semiconductor switching element. In the speed-up circuit, a second field effect transistor is connected in series to a first field effect transistor and is configured to be connected to the gate of the semiconductor switching element. The impedance element has an impedance higher than an impedance of the speed-up circuit when both the first field effect transistor and the second field effect transistor are in an ON state.

Abstract: A semiconductor device includes a supporting substrate, a semiconductor chip, a resin member, and a heat-dissipating metal layer. The supporting substrate has a first surface and a second surface located opposite from each other in a thickness direction defined for the supporting substrate. The semiconductor chip includes a plurality of electrodes. The semiconductor chip is bonded to the supporting substrate on one side thereof with the first surface. The resin member has a first surface and a second surface located opposite from each other in a thickness direction defined for the resin member. The resin member covers at least a side surface of the supporting substrate and a side surface of the semiconductor chip. The heat-dissipating metal layer is arranged in contact with the supporting substrate and the resin member to cover the second surface of the supporting substrate and the second surface of the resin member at least partially.

Abstract: An inertia measurement device, which is used in combination with a satellite positioning receiver that outputs a positioning result at every T seconds in a positioning system equipped on a vehicle, when a Z-axis angular velocity sensor, a position error P[m] based on the detection signal of the Z-axis angular velocity sensor while the vehicle moves at a moving speed V[m/sec] for T seconds satisfies Pp?P=(V/Bz)×(1?cos(Bz×T)) (where, a bias error of the Z-axis angular velocity sensor is Bz[deg/sec] and a predetermined allowable maximum position error during movement for T seconds is Pp[m]), and a bias error Bx and By of the Y-axis angular velocity sensor satisfies Bz<Bx and Bz<By.

Abstract: A GaN layer is formed over the substrate. An AlGaN layer is formed on the GaN layer. A first source electrode, a first gate electrode, a second gate electrode, and a second source electrode are formed on or over the AlGaN layer. A first p-type Alx1Ga1-x1N layer where 0?x1<1 is interposed between the first gate electrode and the AlGaN layer. A second p-type Alx2Ga1-x2N layer where 0?x2<1 is interposed between the second gate electrode and the AlGaN layer. The substrate is electrically insulated from all of the first source electrode, the second source electrode, the first gate electrode, and the second gate electrode. The bidirectional switch further includes a terminal used to connect the substrate to a fixed potential node. The terminal is connected to the substrate.

Abstract: A screw member that has passed through a holder insertion hole and a resistor insertion hole being screwed into an internal threaded hole fixes a holder and a resistor to a bottom wall of a motor housing member. Thus, the resistor is attached to the motor housing member using the screw member that attaches the holder to the motor housing member. This reduces the space in the inverter accommodation chamber.

Abstract: An electric compressor for a vehicle includes an inverter, a motor, and a first connector and a second connector electrically connecting an in-vehicle power supply and the motor with the first connector and the second connector being fitted to each other. The first connector includes a tubular receiving portion made of resin and a first conductive portion disposed inside the receiving portion. The second connector includes a tubular insertion portion made of resin and insertable into the receiving portion, and a second conductive portion disposed inside the insertion portion and connected to the first conductive portion. A rib is disposed between an inner surface of the receiving portion and an outer surface of the insertion portion. The rib is formed integrally with one of the inner surface and the outer surface, and is in contact with the other of the inner surface and the outer surface.

Abstract: An electric compressor includes a compression part, an electric motor, an inverter device, and a housing. The inverter device includes an inverter circuit, a noise reduction unit, and a circuit board. The noise reduction unit includes a common mode choke coil and a smoothing capacitor. The common mode choke coil includes an annular core, a pair of winding wires, and an annular electrical conductor. The electrical conductor is split into a first metal plate and a second metal plate in a circumferential direction. The first metal plate is thermally coupled to the housing. The second metal plate is electrically connected to the first metal plate. An electrical resistance value of the first metal plate is larger than that of the second metal plate.

Abstract: Provided are: a sending/receiving unit to receive data frames sent from another wireless station and receivable, the receivable data frames including a first data frame that is a relay target; an interference time storage unit to store an interference time that is a time from when the sending/receiving unit starts receiving each of the data frames to when the sending/receiving unit terminates receiving the data frame; a waiting time determination unit to determine a waiting time on a basis of the interference time; a frame generation unit to generate a second data frame by changing a destination of the first data frame to a data aggregation station that aggregates the data frames or to a wireless station that serves as a relay destination; and a transmission control unit to wait for the waiting time and cause the sending/receiving unit to send the second data frame.

Abstract: A motor-driven compressor includes a compression unit, an electric motor, a motor controller, a housing, and a connector. The motor controller includes a circuit board. The housing includes an inverter accommodation chamber, and the inverter accommodation chamber accommodates the motor controller. The connector is accommodated in the inverter accommodation chamber and electrically connects the circuit board and a member located outside the inverter accommodation chamber. The connector includes one or more busbars and a case. The one or more busbars are electrically connected to the circuit board. The case is formed from a resin and accommodates the one or more busbars. The circuit board and the connector are fastened to the housing. The one or more busbars are allowed to move in the case when the circuit board vibrates.

Abstract: A control system includes a control unit. When turning a bidirectional switch element ON, the control unit controls the bidirectional switch element to cause a time lag between a first timing and a second timing. The first timing is a timing when a voltage equal to or higher than a threshold voltage is applied to one gate electrode selected from a first gate electrode and a second gate electrode. The one gate electrode is associated with one source electrode selected from a first source electrode and a second source electrode and having a lower potential than the other source electrode. The second timing is a timing when a voltage equal to or higher than a threshold voltage is applied to the other gate electrode associated with the other source electrode having a higher potential than the one source electrode.