Mitsubishi Electric Corporation

Mitsubishi Electric Cornoration

Kei Hayase

Satoshi Murakami

Ryota Kondo

Takaaki Takahara

Hiroyasu Iwabuki

Hiroto Mizutani

An electrical power conversion apparatus is obtained in which its devices constituting a DC/DC converter are not required to be large-sized, and a DC capacitor connected between an AC/DC converter and the DC/DC converter can be small-sized. The electrical power conversion apparatus includes a DC capacitor connected between an AC/DC converter and a DC/DC converter, and a control circuit for controlling the AC/DC converter and the DC/DC converter, wherein the control circuit generates an output current instruction of the DC/DC converter by performing superposition of an alternating current instruction on a direct current instruction, and determines an amplitude of the alternating current instruction in accordance with temperature information obtained from a DC-capacitor's temperature acquisition means.

Electrical power conversion apparatus

A power conversion device includes a circuit board on which wirings are formed and plural semiconductor switching elements are mounted; and a driver circuit which is mounted on the circuit board, and operates at least two of the plural semiconductor switching elements together; wherein the plural semiconductor switching elements are provided as packages having a same shape, and placed in such a positional relationship in which an inter-control-terminal distance that is a distance between their respective control terminals is shorter than a length of a terminal side that is a side of each of the packages at which the control terminal is placed.

Power conversion device minimizing footprint

A period from when switching elements S, Sat first diagonal positions in a full-bridge inverter are turned off at the same time to when switching elements S, Sat second diagonal positions are turned on at the same time, is defined as T, and a period from when the switching elements S, Sat the second diagonal positions are turned off at the same time to when the switching elements S, Sat the first diagonal positions are turned on at the same time, is defined as T. With a total length of Tand Tset to be constant, the lengths of Tand Tare controlled to be changed every switching cycle.

Power conversion device

Provided is a power conversion circuit for achieving a power conversion device capable of suppressing charging/discharging of a parasitic capacitor caused by high-frequency switching, and of reducing a loss of a semiconductor switching element. The power conversion circuit includes: a circuit board including a plurality of layers including two or more layers, on which circuit patterns are formed; and a plurality of semiconductor switching elements connected to the circuit patterns of the circuit board, and configured to perform switching for power conversion. In the circuit board, a plurality of control ground patterns for different nodes, which are configured to drive the plurality of semiconductor switching elements, are arranged so as not to overlap one another in plan view.

Power conversion circuit

To provide a switching device driving unit that can shorten a connecting distance between a driver and a semiconductor switching element, while ensuring the insulation between a driver and a cooling device, even in a case of employing a semiconductor switching element which is composed of wide gap semiconductor. The switching device driving unit includes a circuit board, a semiconductor switching element composed of wide band gap semiconductor, a cooling device and a driver. The driver is surface mounted on a second face, which is an opposite side face of a first face which is a face of the circuit board on a side where the cooling device is disposed.

Switching device driving unit

This invention is concerning a secondary side reflux circuit having a series circuit that is formed by connecting a secondary side reflux diode and a reflux reactor in series, the secondary side reflux circuit being provided on a secondary side of a DC/DC converter that subjects DC power from a DC power supply to DC/DC conversion and outputs the converted power to a load connected in series to a smoothing reactor connected to an output side of a rectifier circuit having a plurality of rectifying semiconductor switching elements. During a period in which a voltage from the DC power supply is not applied to a primary side of a transformer, the secondary side reflux circuit diverts a load current flowing through a load so as to return the load current to the load.

DC/DC converter having current diversion circuit

Provided is a radar apparatus that can detect the failure of the transmission switch. The radar apparatus includes: a plurality of transmission antennas; transmission switches that select a transmission antenna for transmitting an electromagnetic wave from among the plurality of transmission antennas; a plurality of reception antennas that receive a reflected wave which is the electromagnetic wave reflected from a target as a reception signal; a signal processing unit that detects the target based on a sampling signal obtained by sampling the reception signal; and a failure judgment unit that compares first reception signals transmitted from one of the plurality of transmission antennas and received by the plurality of reception antennas, with second reception signals transmitted from another of the plurality of transmission antennas and received by the plurality of reception antennas, and judges whether or not any one of the transmission switches has failed based on a comparison result.

Radar apparatus

A radar device includes: a frequency modulating unit for modulating a frequency of a transmission signal by a triangular wave; a transmitting unit for pulsing the frequency modulated transmission signal to transmit the pulsed transmission signal as a transmission pulse; a receiving unit for generating a beat signal based on a frequency difference between a frequency modulated transmission signal and a reflected received pulse; a range gate setting unit for setting a range gate that determines a sampling timing of the received pulse based on a transmitting timing of the transmission pulse; a sampling unit for sampling the beat signal in each of range gates; a distance and relative velocity calculating unit for calculating a distance to a target and a relative velocity based on the sampled beat signal; and a control unit for controlling a transmission pulse width and a range gate width depending on a subject vehicle velocity.

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Tokyo, Japan

Kei Hayase