Abstract: A power conversion device includes a first inverter connected to first ends of m (m is an integer equal to two or more) coil groups, a second inverter connected to second ends of the m coil groups, m?1 separation relay circuits connected between two adjacent coil groups of the m coil groups, m?1 first neutral point relay circuits provided between two adjacent coil groups of the first inverter side of each of the m?1 separation relay circuits, and m?1 second neutral point relay circuits provided between two adjacent coils of the second inverter side of each of the m?1 separation relay circuits.

Abstract: A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, a phase separation relay circuit to switch between connection and disconnection between the first ends of the windings of each phase and the first inverter, a neutral point relay circuit connected to the first ends of the windings of each phase and to switch between connection and disconnection between the first ends of the windings of each phase, a first switching element to switch between connection and disconnection between the second inverter and a power supply, and a second switching element to switch between connection and disconnection between the second inverter and a ground.

Abstract: A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, a first phase separation relay circuit to switch between connection and disconnection between the first ends of the windings of each phase and the first inverter, a second phase separation relay circuit to switch between connection and disconnection between the second ends of the windings of each phase and the second inverter, a sub-inverter circuit connectable to the first ends and the second ends of the windings of each phase, a third phase separation relay circuit to switch between connection and disconnection between the first ends of the windings of each phase and the sub-inverter circuit, and a fourth phase separation relay circuit to switch between connection and disconnection between the second ends of the windings of each phase and the sub-inverter circuit.

Abstract: A power conversion device includes a first converter connected to first ends of windings of each phase of a motor, a second converter connected to second ends of the windings of each phase, and a switching circuit used to define a neutral point in the windings of each phase on the first inverter side. At least one of a plurality of switches included in the first inverter has a first current capacity, and a plurality of switches included in the second inverter have a second current capacity that is greater than the first current capacity.

Abstract: A power conversion device includes a first inverter connected to a first end of a winding of each phase of a motor, a second inverter connected to a second end of the winding of each phase, and first and second switching circuits. The power conversion device further includes a normal state operation mode in which power conversion is performed by using a first neutral point of the winding of each phase in the second inverter and the first inverter and an abnormal state operation mode in which the power conversion is performed by using a second neutral point of the winding of each phase in the first inverter and the second inverter. An operation mode of the power conversion is switched from the normal state operation mode to the abnormal state operation mode when at least one switch in the first inverter fails.

Abstract: A power conversion device includes a first inverter connected to first ends of windings of each phase of a motor, a second inverter connected to second ends of the windings of each phase, and a first switching circuit including at least one of a first switch to switch between whether the first inverter and a power supply are connected or disconnected and a second switch to switch between whether the first inverter and a ground are connected or disconnected. The power conversion device has a first operation mode when the motor is driven at a low speed, and a second operation mode when the motor is driven at a high speed.

Abstract: An image forming apparatus includes an image forming unit, first and second obtaining units, an output unit, and a sender. The image forming unit forms an image on a recording medium. The first obtaining unit obtains, from each of plural measuring devices provided in different locations outside an air-conditioning control device, environment information indicating an environment around a corresponding measuring device. The second obtaining unit obtains position information indicating a position of a user. The output unit outputs air-conditioning control information based on the obtained environment information and the obtained position information for controlling a subject air-conditioning control device. The sender sends the output air-conditioning control information to a destination device.

Abstract: An image forming apparatus includes an image forming unit, first and second obtaining units, an output unit, and a sender. The image forming unit forms an image on a recording medium. The first obtaining unit obtains, from each of plural measuring devices provided in different locations outside an air-conditioning control device, environment information indicating an environment around a corresponding measuring device. The second obtaining unit obtains position information indicating a position of a user. The output unit outputs air-conditioning control information based on the obtained environment information and the obtained position information for controlling a subject air-conditioning control device. The sender sends the output air-conditioning control information to a destination device.

Abstract: An image processing apparatus includes an image processor, a receiver, a processor, and a sender. The image processor performs image processing on image data. The receiver receives measurement data from plural measuring devices disposed outside the image processing apparatus. The processor performs protocol conversion processing and data processing on the measurement data received by the receiver in accordance with each destination device which will receive the measurement data. The sender sends the measurement data subjected to the protocol conversion processing and the data processing performed by the processor to the destination device.