Abstract: A motor inverter is provided with switching elements for each phase of a 3-phase motor, and driving the motor by turning on and off the switching elements. In an example of a control device of the motor inverter, the control device includes: a stationary phase determination unit for defining a phase in a plurality of phases provided with switching elements for each area as a stationary phase in which a switching operation is not performed, based on current command value of each phase acquired from d-axis current command value and q-axis current command value of the motor, with one rotation in electrical angle of a rotor of the motor divided into a plurality of areas; and a drive unit for performing the switching operation of switching elements of the phases other than the stationary phase determined for each area to perform, and realizing 2-phase modulation control.

Abstract: A motor inverter is provided with switching elements for each phase of a 3-phase motor, and driving the motor by turning on and off the switching elements. In an example of a control device of the motor inverter, the control device includes: a stationary phase determination unit for defining a phase in a plurality of phases provided with switching elements for each area as a stationary phase in which a switching operation is not performed, based on current command value of each phase acquired from d-axis current command value and q-axis current command value of the motor, with one rotation in electrical angle of a rotor of the motor divided into a plurality of areas; and a drive unit for performing the switching operation of switching elements of the phases other than the stationary phase determined for each area to perform, and realizing 2-phase modulation control.

Abstract: A power supply apparatus that supplies voltage of a battery to a load is disclosed. The power supply apparatus includes a booster circuit connected to the battery and a power storage section, which temporarily stores the power output by the booster circuit. The power storage section is connected in parallel with the load.

Abstract: A current measuring device measures the current flowing through each conductor which connects a power supply with a motor. Coreless current sensors are arranged between pairs of the conductors. Coefficients which represent a relationship between a fixed standard current flowing through a conductor and the output signal from coreless current sensors for the fixed standard current are obtained in advance from known measurements. A calculator then determines the current flowing through each conductor based upon the corresponding output signals from the coreless current sensors, the measured coefficients and formula Iu+Iv+Iw=0.

Abstract: A current measuring device measures the current flowing through each conductor which connects a power supply with a motor. Coreless current sensors are arranged between pairs of the conductors. Coefficients which represent a relationship between a fixed standard current flowing through a conductor and the output signal from coreless current sensors for the fixed standard current are obtained in advance from known measurements. A calculator then determines the current flowing through each conductor based upon the corresponding output signals from the coreless current sensors, the measured coefficients and formula Iu+Iv+Iw=0.

Abstract: A power converter that can be used in a vehicle equipped with an electrical motor provides power to both the electrical motor and other, auxiliary loads, such as a headlamp, that require a different voltage. The power converter includes a first DC power supply that generates a first voltage equivalent to the voltage required by the auxiliary loads and a second DC power supply, connected in series with the first DC power supply, that generates a differential voltage, where the sum of the differential voltage and the first voltage is the voltage required to drive the electrical motor. A DC-DC converter is connected to the second power supply and converts the differential voltage to the voltage required to drive the auxiliary loads.

Abstract: In a multi-output power conversion circuit which drives a polyphase AC motor and another device but the polyphase AC motor using a DC power source, a transformer is connected to the neutral point of the polyphase AC motor, an AC voltage at a zero-phase voltage frequency is obtained from the transformer, and the other device is loaded with the AC voltage.

Abstract: An inverter apparatus includes an inverter for driving a 3-phase motor, a power supply circuit for applying direct current voltage to the inverter, a switching element mounted above and below an arm of each phase, a smoothing capacitor for protecting a voltage applied to the inverter from reaching a value equal to or larger than a predetermined value, and a control circuit for generating a control signal for control of an ON/OFF switching operation of each switching element. The control signal is generated by the control circuit such that the ON timing of each switching element of each phase can be shifted from each other.

Abstract: An inverter includes a plurality of transistors, generates a 3-phase AC voltage, and supplies it to a 3-phase AC motor. The voltage on the primary side of a transformer connected to the neutral point of the 3-phase AC motor is controlled by changing the phase difference of a drive signal of each phase supplied to the inverter through a phase difference circuit. Thus, the output voltage of the transformer can be set to a desired value by a power supply circuit with a simple configuration.

Abstract: An inverter includes a plurality of transistors, generates a 3-phase AC voltage, and supplies it to a 3-phase AC motor. The voltage on the primary side of a transformer connected to the neutral point of the 3-phase AC motor is controlled by changing the phase difference of a drive signal of each phase supplied to the inverter through a phase difference circuit. Thus, the output voltage of the transformer can be set to a desired value by a power supply circuit with a simple configuration.

Abstract: In a multi-output power conversion circuit which drives a polyphase AC motor and another device but the polyphase AC motor using a DC power source, a transformer is connected to the neutral point of the polyphase AC motor, an AC voltage at a zero-phase voltage frequency is obtained from the transformer, and the other device is loaded with the AC voltage.

Abstract: A charging apparatus for charging batteries of automobiles includes an inverter for converting the direct current from a direct current power source into an alternating current and a transformer having a first coil and a second coil. When an alternating current from the inverter is applied to the first coil, the second coil produces an alternating voltage. A capacitor is connected between the terminals of the second coil to increase the alternating voltage produced in the second coil. A rectifier circuit rectifies the alternating voltage increased in the booster circuit into a direct current voltage and the direct current voltage is applied to the battery. Two transistors, which function as a short circuit, are provided in the rectifier circuit. When the direct current voltage from the rectifier circuit is equal to or higher than a predetermined permissible value, a drive signal from a drive circuit turns on the two transistors.