Abstract: A diode linearizer according to the present invention has parallelly mounting linearizer core units on a RF signal path via capacitors between the RF signal path and a ground, thus does not need a switch using an FET, for example, at a time of selectively operating a plurality of linearizer core units. Moreover, the diode linearizer does not need a capacitor in series for blocking a direct current between RF signal input and output terminals. Thus, a range of a gain which can be compensated by the diode linearizer can be increased. Furthermore, an insertion loss of the RF signal path in a state where the diode linearizer is off can be reduced, and a range of a gain expansion in operation can be increased. The switch is not used, or the number of elements of the capacitors which are needed is small, thus a circuit size is also small.
Abstract: In a wireless communication system, SINR data are obtained from power measurements data, as follows: gathering first power measurements data of total power received during communications; gathering second power measurements data of in-transmission interference power; computing third power measurements data of useful power, from the first and second power measurements data; gathering fourth power measurements data of out-transmission interference power; merging the second and fourth power measurements data so as to form a set of fifth interference power data; computing a first characteristic function from the third power measurements data, and computing a second characteristic function from the fifth power measurements data; building a third characteristic function relating to the SINR data related to the transmission channel, by performing a term-by-term product of the first and second characteristic functions; computing a probability mass function from the third characteristic function.
February 28, 2018
Date of Patent:
June 8, 2021
MITSUBISHI ELECTRIC CORPORATION, MITSUBISHI ELECTRIC R&D CENTRE EUROPE B.V
Nicolas Gresset, Hiroyasu Sano, Kazumasa Suzuki
Abstract: A power conversion device includes power conversion circuitry including a plurality of submodules connected in series to each other. The power conversion device further includes: a signal reception unit configured to receive a signal representing a voltage of a capacitor in each of the submodules; a time calculation unit configured to calculate at least one of a charging time of the capacitor and a discharging time of the capacitor based on the signal; and a determination unit configured to determine whether the capacitor has degraded or not based on at least one of a first result of comparison of the charging time with a reference charging time serving as a reference for determining degradation of the capacitor, and a second result of comparison of the discharging time with a reference discharging time serving as a reference for determining degradation of the capacitor.
Abstract: A power converter control device performs PWM control for power converters which respectively supply power to a plurality of winding groups of a multiplex-winding electric motor including the plurality of winding groups, the power converter control device including a PWM control unit which performs control while selectively switching among an asynchronous PWM control mode using a carrier not synchronized with voltage commands for respective winding groups and both or one of a first synchronous PWM control mode in which voltage commands for respective winding groups are subjected to PWM control using a carrier synchronized with a voltage command for a specific winding group, and a second synchronous PWM control mode in which voltage commands for respective winding groups are subjected to PWM control using respective carriers synchronized with the respective voltage commands.
Abstract: A motor drive apparatus includes: inverter modules equivalent in number to phases of a motor; and a control unit that generates a PWM signal for driving the inverter modules by using PWM. Each of the inverter modules includes: a plurality of pairs of switching elements, each pair of switching elements including two switching elements connected in series; a drive circuit; and a protection circuit. The plurality of pairs of switching elements is connected in parallel, and power GNDs that are reference terminals of the plurality of pairs of switching elements, a control GND that is a reference terminal of the drive circuit, and a terminal for overcurrent fault input in the protection circuit are independently exposed to the outside. The power GNDs and the control GND are connected to a single point on a printed circuit board by a wiring pattern.
Abstract: A normally-off first gate channel region is provided on a first main surface side, in a region in a p base between an n base and an n emitter connected to an emitter electrode. On and off of the first gate channel region is controlled by a voltage of a first gate electrode. A normally-on second gate channel region is provided on a second main surface side, by an n-type region between an n collector electrically connected to a collector electrode and the n base. On and off of the second gate channel region is controlled by a voltage of a second gate electrode.
Abstract: A motor drive system can detect a misconnection. A motor drive system for driving a motor including a plurality of stator windings includes: an inverter that converts a DC voltage supplied from a DC voltage source into an AC voltage and applies the AC voltage to the motor; a connection switching device that is disposed between the inverter and the motor and can switch a connection state of the stator windings; and a controller that performs abnormality determination on a connection state of the connection switching device on the basis of a current value of a current flowing in each of the stator windings.
Abstract: A gas-insulated electric apparatus includes: a sealed container made of metal; a high-voltage conductor, housed within the sealed container, that receives voltage; an insulating support member that insulates the high-voltage conductor from the sealed container and support the high-voltage conductor to the sealed container; and a nonlinear-resistance film covering at least a portion of an inner surface of the sealed container, the portion being on a lower side of the inner surface with respect to the high-voltage conductor. The nonlinear-resistance film is formed by particles of a nonlinear-resistance material and an insulating material, and the particles of the nonlinear-resistance material are dispersed in the insulating material. The particles of the nonlinear-resistance material are placed in the insulating material such that one or more of the particles of the nonlinear-resistance material is in constant contact with a conductive foreign object trapped inside the sealed container.
Abstract: A power converter includes a magnetic core and a plurality of windings. The plurality of windings are each wound around the magnetic core and bent to have a portion extending in the direction in which the magnetic core extends. Each of the plurality of windings is bent to include a region located farthest out from the magnetic core among all of the plurality of windings.
August 24, 2016
Date of Patent:
June 8, 2021
MITSUBISHI ELECTRIC CORPORATION
Koji Nakajima, Takashi Kumagai, Jun Tahara
Abstract: A scroll compressor includes: a compression mechanism unit 3 that includes a fixed scroll 31 and an orbiting scroll 32; a crank shaft 6 that causes the orbiting scroll 32 to orbit about the fixed scroll 31; a slider 71 that is provided between the orbiting scroll 32 and the crank shaft 6 and that includes tubular portions 711 and 712 and a flange portion 713 projecting from the outer circumferential surface between one end and the other end of the tubular portions 711 and 712; and a balance weight 72 that is fitted to the slider 71 and that includes a ring-like portion 721 having a portion of the inner surface facing the flange portion 713, a weight portion 722 having an inner surface facing the tubular portion 711 or 712 closer to the one end side U than the flange portion 713, and a projection 723 projecting from the inner circumferential surface of the ring-like portion 721 and having an inner surface facing the tubular portion 711 or 712 closer to the other end side L than the flange portion 713.
Abstract: An FM-CW radar includes a high frequency circuit that receives a reflected wave from a target, and a signal processing unit that converts an analog signal generated by the high frequency circuit into a digital signal and detects at least a distance to the target and velocity of the target. The high frequency circuit includes a VCO that receives a modulation voltage from the signal processing unit and generates a frequency-modulated high frequency signal. The signal processing unit includes an LUT that stores default modulation control data. The signal processing unit applies a default chirp having a linear characteristic, calculates an initial frequency value and an initial voltage value from a voltage-frequency characteristic manifested by the application of the default chirp, generates time data using a result of the calculation, and updates the data stored in the LUT with the time data generated.
Abstract: An equipment management system includes an equipment apparatus installed in a construction and configured to operate in accordance with details of manipulation, an equipment manipulation terminal including an equipment communication unit and configured to manipulate the equipment apparatus, and an external manipulation terminal including an external communication unit configured to communicate with the equipment manipulation terminal. The external manipulation terminal is configured to manipulate the equipment apparatus indirectly. When the equipment apparatus is manipulated by the external manipulation terminal, the external manipulation terminal transmits details of manipulation to the equipment manipulation terminal, and the equipment manipulation terminal manipulates the equipment apparatus in accordance with the details of manipulation received from the external manipulation terminal.
Abstract: A fuel efficiency estimation system includes: a velocity profile calculation unit to calculate a velocity profile indicating a change in velocity of a motor vehicle traveling a traveling route; a velocity disturbance calculation unit to calculate, based on disturbance information indicating a disturbance event occurring on the traveling route and traveling history information collected from the motor vehicle traveling the traveling route, an attenuation factor, which is a ratio of attenuation of the velocity of the motor vehicle traveling the traveling route, as a velocity disturbance correction coefficient; and a fuel efficiency calculation unit to calculate fuel efficiency of the motor vehicle traveling the traveling route by using the velocity profile and the velocity disturbance correction coefficient.
Abstract: Provided is an indoor unit for a heat pump use apparatus, the indoor unit being a part of the heat pump use apparatus including a refrigerant circuit configured to circulate refrigerant, a heat medium circuit configured to allow a heat medium to flow through the heat medium circuit, and a heat exchanger configured to exchange heat between the refrigerant and the heat medium. The indoor unit is connectable to an outdoor unit accommodating the refrigerant circuit and the heat exchanger. The indoor unit accommodates a part of the heat medium circuit. The indoor unit includes a pressure protection device connected to the heat medium circuit, and an on-off device provided to be interposed between the heat medium circuit and the pressure protection device.
Abstract: An electric quantity of a power supply of a connection switching device for switching the connection state of a motor, or at least one electric quantity which varies with the first-mentioned electric quantity is detected, the result of the detection is used to detect or predict a fall of a voltage of the switching power supply. Based on the result of the detection or prediction, an inverter is so controlled as to stop the motor before the voltage of the switching power supply falls below the minimum voltage required for the operation of the connection switching device. Breakdown of the connection switching device can be prevented.
Abstract: In an operation control device (10), a plan selection unit (15) determines, at a time point midway through a time zone where an operation of an air conditioner (54) is controlled along one control plan among a plurality of control plans, whether a weather change pattern corresponding to the one control plan deviates from an actual weather change pattern, based on weather data. If deviates, the plan selection unit (15) selects a weather change pattern that is different from the weather change pattern corresponding to the one control plan, from among a plurality of weather change patterns, in accordance with the weather data. During a rest of the time zone, the plan selection unit (15) controls the operation of the air conditioner (54) along a control plan corresponding to the different weather change pattern, among the plurality of control plans.
Abstract: An electric motor includes an annular stator and a consequent-pole-type rotor including an annular rotor core disposed on the inner side of the stator and a plurality of permanent magnets disposed inside the rotor core and arrayed in a circumferential direction of the rotor core, in which the stator is covered with an unsaturated polyester resin.
Abstract: A switchgear includes a movable part capable of reciprocating movement in first and second directions, a movable contact coupled to the movable part and capable of reciprocating movement relative to the movable part, a biasing member that biases the movable contact, a latch part capable of switching between a first state in which movement of the movable contact in the first direction is restricted and a second state in which movement of the movable contact in the first direction is permitted, and a fixed contact provided on a side of the first direction with respect to the movable contact. When the movable part and the movable contact move in the first direction, after movement for a predetermined distance, the movement of the movable contact is restricted by the latch part in the first state, and then, when the movable part has moved further in the first direction, the latch part is switched to the second state.
Abstract: A semiconductor device includes: a semiconductor module including a module main body having first and second main surfaces which are opposite to each other, and a terminal protruding from a side surface of the module main body and bent toward the first main surface; a mounting board placed on the first main surface side and connected to the terminal; a heat radiation fin placed on the second main surface side; and a screw fitting a fitting portion of the module main body from the first main surface side to the heat radiation fin, wherein the mounting board is provided with an opening at a portion facing the fitting portion, and a type of a product is printed on the first main surface and exposed from the opening of the mounting board.