Denso Corporation

Asaka Kimura

Makoto Taniguchi

Toshinori Maruyama

Takatoshi Inokuchi

Keiji Kondo

Masaya Nakanishi

In an onboard charging apparatus, a plurality of main electric-power storage apparatuses are connected in series to one another. A main electric-power storage apparatus on a lowest potential side of the main electric-power storage apparatuses is a lowest potential electric-power storage apparatus. The lowest potential electric-power storage apparatus has a nominal voltage that is set to 12 V, and supplies electric power to an electrical component mounted to a vehicle. In the onboard charging apparatus, a connecting unit selectively connects, by switching control, the output terminal and any of high potential side terminals of the main electric-power storage apparatuses. A switching control unit controls switching of the connecting unit to switch the high potential side terminal selected as a connection destination of the output terminal among the high potential side terminals of the main electric-power storage apparatuses, based on an output voltage of the output terminal.

Onboard charging apparatus

A rotating electric machine apparatus includes a rotating electric machine and a full-bridge inverter. The full-bridge inverter includes first high-side switches, first low-side switches, second high-side switches, and second low-side switches. The rotating electric machine apparatus includes: first and second neutral point switches; a full-wave driving unit that performs a full-wave driving process in which switching control of the switches is performed in a state in which the first and second neutral point switches are turned off; a half-wave driving unit that performs a half-wave driving process in which switching control of the first high-side switches and the second low-side switches is performed in a state in which the first and second neutral point switches are turned on, and the first low-side switches and the second high-side switches are turned off; and an executing unit that selects and performs either of the full-wave driving process and the half-wave driving process.

Rotating electric machine apparatus

A rotating electric machine system includes a rotating electric machine and an electric power conversion circuit. The rotating electric machine includes N coils connected with each other to define a neutral point therebetween. The electric power conversion circuit includes N high-side switches, N low-side switches, a selector switch, a full-wave driver, a half-wave driver and a drive controller. The full-wave driver performs a full-wave drive process with high potential-side terminals of the low-side switches respectively connected with low potential-side terminals of the high-side switches by the selector switch. The half-wave driver performs a half-wave drive process with the high potential-side terminals of the low-side switches connected with the neutral point by the selector switch. The drive controller controls both the full-wave driver and the half-wave driver to selectively cause either the full-wave driver to perform the full-wave drive process or the half-wave driver to perform the half-wave drive process.

Rotating electric machine system

In a power generator, a determiner determines whether a phase voltage output from each of multiphase armature windings has exceeded a threshold voltage. A turn-on unit turns on at least one of the protective switches as a target protective switch to limit the output voltage of the rectifier circuit to be lower than the threshold voltage upon the phase voltage output from at least one of the multiphase armature windings corresponding to the at least one of the protective switches has exceeded the threshold voltage.

Power generator with load-dump protection

An electric rotating machine for a vehicle is equipped with a load dump protector. The load dump protector works to selectively perform a first and a second load dump protection operation to suppress a voltage surge arising from the load dump. When a rate at which an output voltage from the electric rotating machine is determined to be smaller than a given value, the load dump protector waits for stating the first load dump protection operation until the time when a voltage surge arising from changing of switching devices of a rectifier module of the electric rotating machine is expected to be suppressed and then performs the first load dump protection operation. When the rate is greater than the given value, the load dump protector immediately initiates the second load dump protection operation. This ensures the stability in eliminating the risk of a voltage surge arising from the load dump.

Electric rotating machine with load dump protector

An alternator has rectifying module groups. The rectifying module groups form a bridge circuit. The rectifying module groups have a load dump protection judgment section for monitoring an output voltage of rectifying module groups. When the monitored output voltage exceeds a first threshold voltage, the load dump protection judgment section provides to a control section an instruction to turn on MOS transistors in a lower arm of the bridge circuit at a time when a predetermined delay time has elapsed. When a second threshold voltage is lower than the first threshold voltage and the monitored output voltage becomes less than the second threshold voltage after the monitored output voltage exceeds the first threshold voltage, the load dump protection judgment section provides to the control circuit an instruction to turn on the MOS transistors in the lower arm after the MOS transistors are turned off during a predetermined time length.

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Kariya, Japan

Asaka Kimura