Kabushiki Kaisha Toyota Jidoshokki

Nissan Motor Company Limited

Kabushiki Kaisha Toyoda Jidoshokki Seisakusho

Seiki Sakata

Yasuharu Odachi

Yoshiaki Ishihara

Kazuki Najima

Satoshi Watanabe

Yasuhiro Koike

Tomotaka Kurozu

Hajime Satoh

Tadayoshi Kachi

Shigeki Ikeda

Masayuki Fukuda

Daiki Mizuguchi

Junichi Takeuchi

Koshiaki Ishihara

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.

Control method and control device of motor inverter

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 I+I+I

Current measuring device and method

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.

Power converting method and apparatus

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.

Multi-output power conversion circuit

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.

Power supply apparatus

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. Then, the terminals of the second coil are short-circuited and the voltage applied to the terminals instantaneously turns null. This protects the elements forming the charging apparatus from high voltage.

Growing community of inventors

Kariya, Japan

Seiki Sakata