| Patent application number | Description | Published |
|---|
| 20100026220 | Driving apparatus for multi-phase AC synchronous motor - An inverter control circuit controls transistors based on comparison of a voltage command wave with a carrier wave, when a magnitude of a voltage vector is equal to or less than a peak value of the carrier wave. The voltage command wave is a wave, which is offset to a maximum value side from a reference potential of the carrier wave so that a maximum value of the voltage command wave equals a peak value of the carrier wave. The inverter control circuit makes an on-period of the transistor on a positive bus side longer than that of the transistor on a negative bus side by using the command voltage. The amount of electricity charged in a capacitor is reduced in comparison with a case in which the voltage command wave is used. Thus, thermal loss of a stator coil and a diode on the positive bus side is reduced. | 02-04-2010 |
| 20100231153 | Driving apparatus for three-phase AC synchronous motor - In a driving apparatus for a three-phase synchronous motor, in which a battery is connected between a neutral point of a stator coil and a negative-pole bus, a control circuit acquires three-phase AC currents. The control circuit checks whether a neutral-point electric current is contained in an electric current detected by an electric current detecting section. Based on the check result, the control circuit checks whether electric current values for three-phases containing the neutral-point electric current are set together or electric current values for three-phases excluding the neutral-point electric current are set together to acquire the three-phase AC currents for driving the motor. | 09-16-2010 |
| 20110031922 | ELECTRIC MOTOR DRIVE DEVICE, CONTROL METHOD OF ELECTRIC MOTOR DRIVE DEVICE, AND ELECTRICALLY DRIVEN DEVICE - An electric motor drive device has an inverter adjusting the voltage applied to an AC electric motor so as to drive the AC electric motor, a capacitor which is charged by a current supplied from a DC power supply supplying DC voltage between a neutral point at which a plurality of coils of the AC electric motor are connected and a positive rail or negative rail of an inverter and passing through the inverter, and a control circuit controlling the inverter so that the AC electric motor turns at a designated speed. Further, the control circuit selectively uses field weakening control and voltage boosting control for control of the inverter according to the conditions of the induced voltage generated at the AC electric motor, DC power supply, and voltage of the capacitor. | 02-10-2011 |
| 20110050136 | Driving apparatus for a vehicle-mounted electric motor - An inverter circuit for a motor outputs three-phase AC currents, which are outputted from common connection points to stator coils, based on output voltage of a DC power source and a power supply capacitor by a switching operation of transistors. An inverter control circuit determines that a system main relay is turned off, upon receiving a main relay-off signal from an electronic control unit. The inverter control circuit turns on the low-side transistors, while turning off the high-side transistors. A discharge current flows from the positive electrode to the negative electrode of the power supply capacitor through the stator coil and the low-side transistors, so that electric charge stored in the power supply capacitor is discharged. | 03-03-2011 |
| Patent application number | Description | Published |
|---|
| 20080279304 | DATA TRANSMITTING DEVICE, DATA TRANSMITTING METHOD, DATA TRANSMITTING AND RECEIVING SYSTEM, DATA TRANSMITTING COMPUTER PROGRAM AND STROAGE MEDIUM THEREFOR, DATA RECEIVING DEVICE, DATA RECEIVING METHOD, AND DATA RECEIVING COMPUTER PROGRAM AND STORAGE MEDIUM THEREFOR - A plurality of connection frames are transmitted which differ from each other in at least either modulation scheme or transfer rate. Accordingly, a receiving-end device can properly receive a connection frame even in an environment where the connection frame is likely to be affected by noise. | 11-13-2008 |
| 20080279560 | Communication Device, Communication System, Communication Method, Communication Program, and Communication Circuit - A transmitter ( | 11-13-2008 |
| 20080279561 | TRANSMITTING SYSTEM AND TRANSMITTING DEVICE - Protocol conversion based on a communication protocol and data modulation based on a communication method are performed, in advance, on desired transmission data by a host device, which is an external device. Then, the converted data will be written to a memory in a transmitting device. According to a transmission command from an input section, a logical device reads out the converted data stored in the memory, and then outputs the read data from a transmitting section. | 11-13-2008 |
| 20080279562 | Transmitter, Receiver, Communication System, Communication Method, Communication Program - A communication system includes a transmitter and a receiver that establish mutual connections of a plurality of their communication layers for communication. The transmitter has a request generating part for generating a connection request including data and commands required to connect the plurality of adjacent communication layers, and a request transmitting part for transmitting the connection request to the receiver. The receiver has a request receiving part for receiving the connection request from the transmitter, and a connection establishing pant for extracting the data and commands from the connection request and establishing, based on the extracted data and commands, the connections of the communication layers. In this way, the time required for establishing the connections can be shortened. Thus, even if a data exchange is interrupted, a reconnection can be made in a short time to resume the data exchange. | 11-13-2008 |
| 20080291941 | Communication Device, Communication System, Communication Method, Communication Program, and Communication Circuit - In a client device ( | 11-27-2008 |
| 20090262661 | DATA TRANSMISSION DEVICE AND METHOD OF CONTROLLING SAME, DATA RECEIVING DEVICE AND METHOD OF CONTROLLING SAME, DATA TRANSFER SYSTEM, DATA TRANSMISSION DEVICE CONTROL PROGRAM, DATA RECEIVING DEVICE CONTROL PROGRAM, AND STORAGE MEDIUM CONTAINING THE PROGRAMS - A content transmission device ( | 10-22-2009 |
