Abstract: A controller (10) includes subtracters (101, 105), a command value corrector (103), and a control block (102). The subtracter (101) obtains a deviation (?v0) of an output voltage (v0) applied from a switching power-supply circuit (61) to a second load (Cdc+Load) with respect to its command value (v0*). The control block (102) performs PI control on the basis of the deviation (?v0) to generate a command value (idc*) for a current (idc) flowing in a coil (Ldc). The command value corrector (103) corrects the command value (idc*) such that high-frequency components of a current (iL) flowing in a first power-supply line (21), with respect to the fundamental frequency of an input current (iu1, iv1, iw1), are consumed in the switching power-supply circuit (61). The subtracter (105) obtains a deviation (?idc) between the corrected command value (idc*) and the current (idc). Commands (r1, r2) for switches are generated on the basis of the deviation (?idc).

Abstract: A motor control unit (10) includes: a power converter (40) having a rectifier circuit (20) which rectifies an AC voltage from an AC power supply (31), a capacitor circuit (22) which receives an output of the rectifier circuit (20) and outputs a rectified voltage having pulses from both ends of a capacitor (13) and an inverter circuit (25) which receives the rectified voltage and outputs an AC voltage to the motor (30); and a motor controller (41) controlling the motor (30) by controlling the inverter circuit (25). The motor controller (41) performs torque control to vary an output toque of the motor (30) in response to variation in load torque of the motor (30).

Abstract: In the case where a chip is made of wide band gap semiconductor, a power conversion apparatus is obtained in which a component having a low heat resistant temperature is prevented from receiving thermal damage by heat generated at the chip. In a configuration including: a chip portion (20) including a chip (21) made of wide band gap semiconductor and a member (22, 23) having a heat resistant temperature equal to or higher than that of the chip (21); and a peripheral component (25) arranged in the vicinity of the chip portion (20) and having a heat resistant temperature lower than that of the chip (21). The chip (21) and the peripheral component (25) are thermally insulated from each other so that the temperature of the peripheral component (25) does not exceed the heat resistant temperature of the peripheral component (25).

Abstract: The inverter comprises a diode bridge (21) that rectifies an inputted three-phase AC voltage into a DC voltage, an inverter section (22) that converts the DC voltage converted by the diode bridge (21) into an AC voltage and outputs the resulting voltage, an LC filter that has an inductor Ldc connected between one output terminal of the diode bridge (21) and one input terminal of the inverter section and a capacitor Cdc connected across the input terminals of the inverter section, a voltage detecting section (24) that detects cross terminal voltage of the inductor Ldc, and a control section (100) that controls the inverter section (22). The control section (100) controls the inverter section (22) so that the transfer characteristic of the I/O voltage of the inverter section (22) becomes a characteristic of the first-order lag system on the basis of the cross terminal voltage of the inductor Ldc detected by the voltage detecting section (24).

Abstract: In a power converter including a V connection inverter circuit, harmonic components included in output voltage are reduced to achieve a reduction in a loss of a load, such as a motor. Operation of four switching elements (a3 to 3d) of a V connection inverter circuit (3) is controlled so that the locus of a flux vector ?p on a complex plane created by using voltage vectors Vp obtained by the operation of the switching elements (3a to 3d) approaches to a circle. Specifically, in order to create the locus of the flux vector ?p close to a circle by using at least three of the four voltage vectors Vp, output sequences and output periods of the voltage vectors Vp are determined.

Abstract: In the case where a chip is made of wide band gap semiconductor, a power conversion apparatus is obtained in which a component having a low heat resistant temperature is prevented from receiving thermal damage by heat generated at the chip. In a configuration including: a chip portion (20) including a chip (21) made of wide band gap semiconductor and a member (22, 23) having a heat resistant temperature equal to or higher than that of the chip (21); and a peripheral component (25) arranged in the vicinity of the chip portion (20) and having a heat resistant temperature lower than that of the chip (21). The chip (21) and the peripheral component (25) are thermally insulated from each other so that the temperature of the peripheral component (25) does not exceed the heat resistant temperature of the peripheral component (25).

Abstract: A motor control unit (10) includes: a power converter (40) having a rectifier circuit (20) which rectifies an AC voltage from an AC power supply (31), a capacitor circuit (22) which receives an output of the rectifier circuit (20) and outputs a rectified voltage having pulses from both ends of a capacitor (13) and an inverter circuit (25) which receives the rectified voltage and outputs an AC voltage to the motor (30); and a motor controller (41) controlling the motor (30) by controlling the inverter circuit (25). The motor controller (41) performs torque control to vary an output toque of the motor (30) in response to variation in load torque of the motor (30).

Abstract: The inverter comprises a diode bridge (21) that rectifies an inputted three-phase AC voltage into a DC voltage, an inverter section (22) that converts the DC voltage converted by the diode bridge (21) into an AC voltage and outputs the resulting voltage, an LC filter that has an inductor Ldc connected between one output terminal of the diode bridge (21) and one input terminal of the inverter section and a capacitor Cdc connected across the input terminals of the inverter section, a voltage detecting section (24) that detects cross terminal voltage of the inductor Ldc, and a control section (100) that controls the inverter section (22). The control section (100) controls the inverter section (22) so that the transfer characteristic of the I/O voltage of the inverter section (22) becomes a characteristic of the first-order lag system on the basis of the cross terminal voltage of the inductor Ldc detected by the voltage detecting section (24).

Abstract: A controller (10) includes subtracters (101, 105), a command value corrector (103), and a control block (102). The subtracter (101) obtains a deviation (?v0) of an output voltage (v0) applied from a switching power-supply circuit (61) to a second load (Cdc+Load) with respect to its command value (v0*). The control block (102) performs PI control on the basis of the deviation (?v0) to generate a command value (idc*) for a current (idc) flowing in a coil (Ldc). The command value corrector (103) corrects the command value (idc*) such that high-frequency components of a current (iL) flowing in a first power-supply line (21), with respect to the fundamental frequency of an input current (iu1, iv1, iw1), are consumed in the switching power-supply circuit (61). The subtracter (105) obtains a deviation (?idc) between the corrected command value (idc*) and the current (idc). Commands (r1, r2) for switches are generated on the basis of the deviation (?idc).

Abstract: A retractor device for a seat-belt that is provided at a joining portion between a side sill and a center pillar in a motorcar. In the side sill, a side sill outer and a side sill inner are welded together at least along their upper portions to form a closed loop cross-section. This side sill is provided with a stiffener and a retractor device is mounted to the stiffener. The stiffener comprises a base portion extending along a side wall portion and a bottom portion of the side sill inner and provided with an aperture for inserting and mounting the retractor device therethrough, a side sill cross-section reinforcement portion connecting the side wall portion with the bottom portion, and an extension portion extending upwards from the gap between the side sill outer and the side sill inner in the top welded portion of said side sill and welded with the center pillar.

Abstract: An outer sill panel formed integrally with a side panel of the car body is joined to an inner sill panel to form an enclosed structure in cross-section. The panel joints are at the top and outer side of the side sill. The inner sill panel is thicker than the outer sill panel. A cover may be provided extending to cover an outer side surface and a bottom surface of the side sill as well as a joint between the side sill and the floor panel of the car body. A partition plate can be provided for reinforcing in the vicinity of a base portion of a center pillar of the side panel.

Abstract: A laminated material as a damping member welded to a panel of a vehicle body comprises a lower sheet of a foamable mer-sheet, an upper sheet of a non-foamable mer-sheet and an intermediate sheet of a reduced size to be interposed between the upper and lower sheets, wherein the upper and lower sheets are welded together at their peripheral end portions which come into direct contact with each other in laminated state. This structure probilits any irregularities present on the body panel surface from appearing on the upper surface of the laminated material and provides a good damping effect. A method for welding a laminated damping material to a vehicle body panel uses an oven which is used in a coating step of a vehicle body assembly line, dry heat of the oven permitting the layer of a foamable material to get foamed and fluidized when the damping material is passed through the oven the coating step, thus providing a thermal welding between the damping material and the panel.