Abstract: The outdoor unit (1000) includes a housing whose inside is divided into a fan chamber (110) and a machine chamber (120). A compressor and a reactor that are heat-generating components are provided in a lower area of the machine chamber (120). An electric board (50) including a printed circuit board (51) and an electric component (52), and an electric component box (10) constituted by an inner box (11) and an outer box (12) and accommodating the electric board are provided above the heat-generating components. A lower face of the inner box (first thermal insulation plate) and a lower face of the outer box (second thermal insulation plate) constitute a double thermal insulation plate (10a).

Abstract: A power converter includes: a rectifying and boosting unit that rectifies first alternating-current power supplied from a commercial power supply and boosts a voltage of the first alternating-current power; a capacitor connected to an output end of the rectifying and boosting unit; an inverter to convert power output from the rectifying and boosting unit and the capacitor into second alternating-current power, and output the second alternating-current power to a device; and a control unit that reduces a current flowing through the capacitor by controlling the rectifying and boosting unit and by controlling the inverter such that the inverter outputs, to the device, the second alternating-current power containing a ripple dependent on a ripple of power flowing from the rectifying and boosting unit into the capacitor. The control unit controls operation of the power converter in accordance with an air-conditioning condition of an air conditioner.

Abstract: The present invention provides a method for accurately measuring a blood component despite uneven distribution of blood introduced into a capillary. The measurement method according to the present invention is characterized in that a plurality of electrode systems for measuring the hematocrit are provided in a capillary of a biosensor to measure the hematocrit at different positions in the capillary. By measuring the hematocrit at the plurality of positions in the capillary as described above, the hematocrit can be measured mom accurately despite uneven distribution of blood introduced into the capillary.

Abstract: A power converter includes: a rectifying and boosting unit that rectifies first alternating-current power supplied from a commercial power supply and boosts a voltage of the first alternating-current power; a capacitor connected to an output end of the rectifying and boosting unit; an inverter to convert power output from the rectifying and boosting unit and the capacitor into second alternating-current power, and output the second alternating-current power to a device; and a control unit that reduces a current flowing through the capacitor by controlling the rectifying and boosting unit and by controlling the inverter such that the inverter outputs, to the device, the second alternating-current power containing a ripple dependent on a ripple of power flowing from the rectifying and boosting unit into the capacitor. The control unit controls in accordance with a load state.

Abstract: A power converting apparatus includes a converter, a smoothing unit, inverters, and a control unit. The inverters are connected to the converter, the inverters being in parallel connection with each other. The inverter converts power output from the smoothing unit into a first alternating-current power, and outputs the first alternating-current power to a device in which a motor is installed. The inverter converts power outputted from the smoothing unit into a second alternating-current power, and outputs the second alternating-current power to a device in which a motor is installed. The control unit controls an operation of the converter and the inverters to reduce a current flowing in the smoothing unit and concurrently controls an operation of the inverter in accordance with an operation state of the inverter and a load unit including the device.

Abstract: A control device controls operation of a power conversion apparatus including a converter, a smoothing capacitor, and an inverter. The control device includes a voltage command calculation unit, a torque ripple compensation command calculation unit, and a beat component compensation command calculation unit. The voltage command calculation unit calculates a voltage command including a first compensation command to reduce a first torque ripple pulsating at twice a frequency of a power-supply voltage. The torque ripple compensation command calculation unit calculates a second compensation command to reduce a second torque ripple pulsating at a rotational frequency of a motor. The beat component compensation command calculation unit calculates a third compensation command to reduce a third torque ripple caused by the first torque ripple and by the second torque ripple.

Abstract: A power converter includes a converter, a smoothing capacitor, an inverter, and a controller. The converter rectifies a power supply voltage applied from an alternating-current power supply. The smoothing capacitor smooths a rectified voltage output from the converter into a direct-current voltage including a ripple. The inverter converts the direct-current voltage smoothed by the smoothing capacitor into an alternating-current voltage to be applied to a motor. The controller performs control such that a first physical quantity representing an operation state of the converter is equal to a second physical quantity representing an operation state of the inverter.

Abstract: A power converter includes a converter that rectifies an alternating-current voltage applied from an alternating-current power supply, a capacitor connected to output ends of the converter, an inverter connected both ends of the capacitor, and a controller that controls an operation of the inverter. A voltage output from the converter includes a ripple component due to a voltage fluctuation of the alternating-current voltage. When the controller performs acceleration and deceleration control on the motor, the controller changes a rotational speed command from a command value during the normal control, in a first period in which a rotational speed of the motor is in a first speed range.

Abstract: A power converter includes a converter, a smoothing capacitor, an inverter, and a single calculator. The converter includes a switching element and rectifies a power supply voltage applied from an alternating-current power supply. The smoothing capacitor smooths a rectified voltage output from the converter into a direct-current voltage including a ripple. The inverter converts the direct-current voltage smoothed by the smoothing capacitor into an alternating-current voltage for a motor. The calculator performs control such that a first physical quantity representing an operation state of the converter is equal to a second physical quantity representing an operation state of the inverter.

Abstract: A power conversion apparatus includes a rectification and boost unit that rectifies a first alternating-current power supplied from a commercial power supply and boosts voltage of the first alternating-current power; a capacitor connected to output terminals of the rectification and boost unit; an inverter that is connected across the capacitor, converts power output from the rectification and boost unit and the capacitor into a second alternating-current power, and outputs the second alternating-current power to a load including a motor; and a control unit that performs operation control on the rectification and boost unit, and performs operation control on the inverter to cause the second alternating-current power that includes a pulsation based on a pulsation of power that flows into the capacitor from the rectification and boost unit to be output from the inverter to the load, to restrain a current that flows into the capacitor.

Abstract: Provided is a power conversion device that can suppress interference between control of input current from an AC power supply and voltage control for a DC capacitor to perform both the controls with high accuracy, and can reduce the capacitance and size of the DC capacitor. A power conversion circuit includes a rectification bridge circuit, a leg circuit having upper and lower legs connected in series, a DC capacitor, a smoothing capacitor, and a reactor. A control circuit performs PWM control of the leg circuit by generating a duty cycle so as to control a voltage of the DC capacitor while controlling an input current from an AC power supply, in a control cycle. When the duty cycle is generated, a sum of duty cycles is made constant in one cycle for each leg.

Abstract: A power conversion apparatus includes a rectification unit that rectifies a first alternating-current power supplied from a commercial power supply; a capacitor connected to output terminals of the rectification unit; an inverter that is connected across the capacitor, converts power output from the rectification unit and the capacitor into a second alternating-current power and, outputs the second alternating-current power to a load including a motor; and a control unit that performs operation control on the inverter to cause the second alternating-current power that includes a pulsation based on a pulsation of power that flows into the capacitor from the rectification unit to be output from the inverter to the load, to restrain a current that flows into the capacitor.

Abstract: A power converter includes a converter circuit, a capacitor, and an inverter circuit. The converter circuit includes diodes that are connected in a half-bridge configuration. An alternating-current input end of the converter circuit is connected to one side of an alternating-current power supply. The inverter circuit includes semiconductor switching elements that are connected in a three-phase bridge configuration. An alternating-current output end of the inverter circuit is connected to a motor as a load, and an alternating-current output end is further connected to another side of the alternating-current power supply.

Abstract: A power conversion device includes a rectification unit that rectifies first alternating current (AC) power supplied from a commercial power supply, a capacitor connected to an output end of the rectification unit, an inverter that converts power output from the rectification unit and from the capacitor into second AC power, and outputs the second AC power to a load including a motor, which inverter is connected to both ends of the capacitor, and a control unit that controls operation of the inverter to output the second AC power from the inverter to the load to reduce current flowing to the capacitor, which second AC power includes a pulsation that depends on a pulsation of power flowing from the rectification unit to the capacitor. No discharge circuit and no overvoltage protection circuit are provided for the capacitor.

Abstract: A power converter includes: a converter including four switching elements in full bridge configuration, the converter converting alternating-current power supplied from an alternating-current power supply into direct-current power; a reactor provided between the alternating-current power supply and the converter; a smoothing capacitor connected between direct-current terminals of the converter; an alternating-current voltage detector detecting an alternating-current voltage output from the alternating-current power supply; an alternating current detector detecting a current flowing through the reactor; and a control circuitry controlling a switching operation of the switching elements. The control circuitry controls the switching elements such that a potential fluctuation due to the switching operation is reduced between a P terminal of the converter and an L terminal of the alternating-current power supply, or between a G terminal of the converter and an N terminal of the alternating-current power supply.

Abstract: A power converting apparatus that converts alternating-current power from an alternating-current power supply into direct-current power and outputs the direct-current power to a direct-current load includes at least two switching circuits connected in parallel with the direct-current load; a coupling reactor that includes at least three connection terminals with two of the at least three connection terminals connected to an alternating-current terminal of one switching circuit different from two switching circuits among the at least two switching circuits; and a control unit that performs, at least once in a half period of the alternating-current power supply, a simple switching control that short-circuits the coupling reactor to the alternating-current power supply through the two switching circuits.

Abstract: A period from when switching elements S1, S4 at first diagonal positions in a full-bridge inverter are turned off at the same time to when switching elements S2, S3 at second diagonal positions are turned on at the same time, is defined as T1, and a period from when the switching elements S2, S3 at the second diagonal positions are turned off at the same time to when the switching elements S1, S4 at the first diagonal positions are turned on at the same time, is defined as T2. With a total length of T1 and T2 set to be constant, the lengths of T1 and T2 are controlled to be changed every switching cycle.

Abstract: An output terminal of a contact type charger connected to an AC power supply 1 and being for boosting or stepping down an input voltage, and an output terminal of a non-contact type charger for receiving power in a non-contact manner are connected to an input terminal of a DC/DC converter via an integrated bus, a DC link capacitor is connected between an AC/DC converter and an isolated DC/DC converter included in the contact type charger, an integrated capacitor is connected to the integrated bus, and a control circuit adjusts a DC voltage of the DC link capacitor or the integrated capacitor such that at least one of power losses or a total power loss of the contact type charger, the non-contact type charger, and the DC/DC converter is reduced.

Abstract: A power conversion device includes: a main body including a substrate to which a power conversion unit and a coil are provided; and a first heat dissipation portion which holds the substrate and dissipates heat of the substrate, wherein the substrate is formed by one sheet, the coil is formed integrally with the substrate, the first heat dissipation portion is fixed to a substrate first surface of the substrate, a heat dissipation second surface of the first heat dissipation portion has a coil cooling portion opposed to and abutting on a part where the coil is formed, of the substrate.

Abstract: A power converter includes: a converter that includes switching elements to convert alternating current (AC) power output from an AC power source into direct current (DC) power; a reactor disposed between the AC power source and the converter; a smoothing capacitor connected to both ends of a DC terminal of the converter; and detectors that detect a physical quantity representing an operational state of the converter. A bus voltage command value is issued that has zones respectively having different change rates during boost operation of the converter, where the change rates each represent how a bus voltage included in the physical quantity changes with a change in a magnitude of the load obtained from the physical quantity.