Inverter Control

Abstract

The present invention suppresses an increase in the DC link voltage of the inverter and the total amount of circulating current when the contactor connecting the inverter and the DC power supply is in a released state. When the contactor (9) is in the released state during the rotation of the rotating electric machine, the inverter control device executes to set the switching element (34) controlled to be in the conductive state in an arm of any one phase, that is, the target arm. Partial turn-off control is performed to control the off state, and then, when the currents (Iu, Iw) of the other two-phase arms are all zero, all remaining switching elements (3 ) is set to the cut-off state to control the full-close control.

Description

technical field [0001] The present invention relates to the technology of driving and controlling an alternating current rotating electric machine. Background technique [0002] For example, a large-output AC rotating electrical machine used for powering an electric vehicle, a hybrid vehicle, etc. is driven at a relatively high voltage. In addition, since the high-voltage power source mounted on such an automobile is a DC battery, it is converted to, for example, a 3-phase AC by an inverter circuit using a switching element. The rotating electrical machine functions not only as a motor that outputs power to drive a vehicle using electric energy, but also as a generator that generates electricity using kinetic energy of a vehicle, an internal combustion engine, or the like. The electric power generated by the rotating electric machine is regenerated and accumulated in the battery. [0003] However, there are cases where a switching device (contactor) is provided between the...

AI Technical Summary

Problems solved by technology

In ASC control, although the rise of the DC link voltage can be suppressed, a large current (circulating current) flows into the switching element and the stator coil

In addition, a large current continues to flow until the electric power accumulated in the stator coil due to heat etc. is consumed

Therefore, there is a possibility that the switching element and the stator coil are consumed, and the service life may be shortened.

In addition, it is necessary to use switching elements corresponding to large currents, which may also affect component costs, manufacturing costs, and product costs.

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