摘要:
A power converter apparatus, including a DC power source, a semiconductor stack, connected to the DC power source in parallel, having a plurality of semiconductor devices and a cooler for refrigerating the semiconductor devices, the semiconductor devices and the cooler are stacked and pressured to each other, and a snubber circuit, connected to the DC power source in parallel, having a serial circuit of a capacitor and a diode, and a resistor connected in parallel to the diode, one terminal of the capacitor is disposed adjacent to the semiconductor stack so that magnetic flux generated by current flowing in the terminal cancels magnetic flux caused by current flowing in the semiconductor stack.
摘要:
A multiple inverter system of the present invention is disclosed. It includes a plurality of input transformers having secondary windings and a plurality of unit inverter cells connected in series at n stages to compose respective phases and supply the electric power to a multiple phase load in combination with the input transformers. The input transformers have 3n sets of three-phase windings at the secondary side and the secondary windings of the transformers, which are out-of-phase at each phase, are connected to unit inverter cells of each phase at the n-th stages. Further, the present invention is provided with a bypass switch control to melt a fuse that is applicable to a unit inverter given with a circuit closing command by giving this circuit closing command to a bypass switch corresponding to applicable unit inverters in response to an operation abnormality detector and a DC abnormality detector.
摘要:
A power converter having at least a pair of voltage drive switching elements, which comprises a gate control circuit, the gate control circuit comprising a detecting section for detecting at least one of a set of device parameters and a set of electric parameters of the voltage drive switching elements, a monitoring section for monitoring at least one of states of turn-on and turn-off of the voltage drive switching elements based on the at least one of a set of device parameters and a set of electric parameters of the voltage drive switching elements detected by the detecting section, and a control section for controlling a gate of the voltage drive switching elements based on a monitoring result of the monitoring section.
摘要:
A method for designing a semiconductor integrated circuit is provided that is capable of a timing simulation that is approximate to an actual operation by reducing the effect of IR drop on the timing without reducing an effective area necessary for arrangement of elements or the number of pads that can be used other than power supply pads and without increasing the processing time. In a FF driving ability change procedure, a flip-flop having a delay time larger than a transition time from a state in which an IR drop occurs in a power supply voltage to a state of an ideal power supply voltage is substituted for an arbitrary flip-flop. Thus, a delay library considering IR drop may be produced previously only for the flop-flop, thus enabling a production time of the library to be reduced and improving the calculation accuracy of the delay time in the delay calculation procedure. Furthermore, the substitution of a flip-flop having a low driving ability enables the area to be reduced.
摘要:
A system for detecting reverse rotation of a 4-cycle, internal combustion engine with three or more cylinder for an outboard motor mounted on a boat, whose output is connected to a propeller such that the boat is propelled forward or reverse. In the system, it is determined whether a counted value of crank angle signals generated once every 30 crank angles is a multiple of a predetermined number (e.g., four in six cylinders), when the cylinders are identified and it is determined that engine rotates reverse when the counted value is determined to be not the multiple and the engine is immediately stopped. With this, it becomes possible to accurately detect the reverse rotation of the engine and prevent its further reverse rotation.
摘要:
A system for detecting malfunction of an equipment such as an alternator or a hydraulic switch that is connected to an internal combustion engine and generates an output. In the system, it is discriminated periodically for a predetermined period of time whether the output of the equipment is within a predetermined range, a number of times that the output of the equipment is discriminated to be out of the predetermined range is counted; and the equipment is determined to have malfunctioned when the count is equal to or greater than the reference value. With this, it becomes possible to detect the malfunction of the equipment accurately.
摘要:
Where there are wirings with different film thicknesses or a sheet resistance in a non-scraped state of a wiring layer cannot be obtained as a result of the CPM technique, a wiring resistance according to a film thickness when an LSI is manufactured is acquired by automatic processing to reduce its difference from a real resistance, and accurate voltage drop analysis is carried out to reduce malfunction in a real chip. In a semiconductor circuit device with a plurality of kinds of film thicknesses in the same wiring layer, with a variation occurring in the wiring film thickness when wirings are formed on a silicon wafer, or a warp occurring in an upper layer because the stacking of lower layers is not uniform in the manufacturing process of the wiring, an error of the wiring resistance due to the difference in the film thickness or warp of the wiring is corrected to produce a virtual layout data.
摘要:
To provide a camera configured to be supported by the hands of a photographer on the bottom surface of the body thereof whose operability is improved by allowing various settings to be easily made with the camera body supported reliably and allowing a set value to be stored and retrieved with a small number of operation members, a configuration is provided which includes a grip portion protruding in a direction orthogonal to an optical axis of a photographic optical system provided in a predetermined position of a lateral surface of the body of the camera and an operating member for allowing input of information to cause execution of a predetermined operation, the operating member being provided in the vicinity of the grip portion. There is further provided a setting member for setting a desired set value, a set value storing member for storing data representing desired set values which can be set with the setting member in advance, a set value retrieving member for arbitrarily reading the data stored in advance with the set value storing member instead of the set value set with the setting member and for setting a set value based on the same and control unit for controlling the set value storing member and the set value retrieving member such that they can be operated with a single operating member.
摘要:
A facsimile device operable in either a memory receiving mode or direct receiving mode. When the device is put in a memory receiving mode after previous memory receiving, the image information transmitted next time is directly received, and thereby the repetition of the memory receiving mode and the retransmission of information can be eliminated and the convenience of memory receiving can be improved. A facsimile control portion detects a memory remaining amount of the image information memory available storing image information. When the absence of a memory remaining amount is detected, the occurrence of a memory over (operation in the memory receiving mode) is stored in the system memory. When the calling arrival occurs, the document is memory-received or directly received on the basis of the presence or absence of the memory over occurrence stored in the system memory.
摘要:
A lens barrel comprises a barrier provided at a front aperture of a photographing lens, a barrier driving mechanism for opening and closing the barrier, a lens driving mechanism for moving at least one lens group in an optical-axis direction, a driving device for operating the lens driving mechanism and the barrier driving mechanism, and a driving force switching device for transmitting driving force of the driving device to a lens driving mechanism at a state capable of photographing and for transmitting driving force of the driving device to a barrier driving mechanism at a state incapable of photographing linked with the movement of the photographing lens from a state capable of photographing to a state incapable of photographing.