Toyota Jidosha Kabushiki Kaisha

Toshihiko Minamii

Takahiko Hasegawa

Kota Manabe

Yoshinobu Sugiyama

Toru Ando

Yamato Niwa

Yu Shimizu

Jun Maeda

Toshiki Miyazaki

A vehicle configured such that an on-board battery is chargeable by receiving electric power from a power supply outside the vehicle includes an inlet, a voltage sensor that detects an input voltage that is a voltage input from the power supply to the inlet, and a control device configured to execute a detection process when connected to the inlet. The detection process includes a first process that suspends charging when a difference between the input voltage before a start of the charging and the input voltage after the start of the charging is equal to or larger than a threshold value, and a second process that stops the charging when a difference between the input voltage during suspension of the charging in the first process and the input voltage after resumption of the charging is equal to or larger than the threshold value.

Detecting an impedance abnormality in a charging path

If sensed a connector as being connected to an inlet, an ECU performs pre-charging of a capacitor. When pre-charging of the capacitor is completed, the ECU closes a relay, and controls a U-phase boost chopper circuit to boost a voltage of the capacitor. The ECU closes relays if the voltage is boosted to a second target voltage.

Charging device and method of control of the same

A charger includes: a relay provided between an input line and a conversion circuit; a voltage sensor that detects AC voltage input to the input line; and a controller that calculates effective value and frequency of the AC voltage based on a waveform of the AC voltage for a predetermined period. When the calculated effective value of the AC voltage is smaller than a voltage threshold during execution of external charging, the controller brings the relay into an open state. When the calculated effective value of the AC voltage is larger than the voltage threshold and the calculated frequency of the AC voltage is larger than a frequency threshold value after the external charging is halted, the controller brings the relay into a close state.

Charger and method for controlling charger

A contactless power transfer system includes a power supply ECU configured to control an inverter to stop power transmission from a power transmission unit when a current generated in the power transmission unit exceeds a predetermined threshold value due to short-circuiting of a power reception coil. The power supply ECU estimates a coupling state between a power transmission coil and the power reception coil, and changes the predetermined threshold value in accordance with the estimated coupling state.

Contactless power transfer system and power transmission device

A charging apparatus includes: a first conversion circuit that converts alternating-current power supplied from an external power supply into direct-current power; a second conversion circuit that converts an output voltage from the first conversion circuit into a voltage for a battery and supplies the voltage to the battery; and a controller configured to change charging power to be supplied to the battery by controlling the first conversion circuit and the second conversion circuit when the output voltage falls outside a predetermined reference range, and to determine whether the output voltage in the changed charging power falls within the reference range. When the output voltage falls outside the reference range, the controller controls the first conversion circuit and the second conversion circuit such that the charging power decreases stepwise until the output voltage falls within the reference range.

Charging apparatus

An apparatus comprises: a voltage monitoring unit for monitoring input direct-current voltages of first and second converters whose output ends are connected in parallel to each other; and a judgment control unit for judging that an output diode of the first converter is short-circuited, when an input direct-current voltage monitored by the voltage monitoring unit with respect to the first converter rises up to a post-step-up voltage stepped up by the second converter during a step-up operation of the second converter.

Apparatus for detecting short-circuit of output diode in converter

A fuel cell system includes a fuel cell, a motor connected to the fuel cell, an FC boost converter which raises the output voltage of the fuel cell to output the voltage to the motor, an inverter, and a controller which controls the fuel cell, the FC boost converter and the inverter. When abnormality occurs in one of the FC boost converter and the inverter, an abnormality signal does not pass through a converter control unit or an inverter control unit but is transmitted to the other device, thereby enabling the stop of both the FC boost converter and the inverter.

Fuel cell system

Between a direct-current power source and a connection point where a resonance current flowing in an opposite direction from a main current joins the main current from the direct-current power source in a resonant converter, there is provided a current blocking circuit which blocks the resonance current toward the direct-current power source. In consequence, it is possible to prevent the reverse charging of the direct-current power source with the resonance current which realizes soft switching in the resonant converter.

Power supply system and plurality parallel resonant converters having current blocking circuit

A chopper circuit includes an input unit that inputs a main turn-on signal for turning on a main switching element and an auxiliary turn-on signal for turning on an auxiliary switching element; and a prohibiting unit that prohibits the main switching element from turning on unless the auxiliary turn-on signal is input.

Growing community of inventors

Nisshin, Japan

Toshihiko Minamii