Mitsubishi Electric Corporation

Nagasaki University

Nippon Avionics Co., Ltd.

Nagasaki University, National University Corporation

Hiroyuki Osuga

Takashi Miyamoto

Sohei Samejima

Teruhiko Kumada

Ikuro Suga

Tsuyoshi Ozaki

Taichiro Tamida

Fujio Kurokawa

Takafumi Nakagawa

Toshiyuki Ozaki

Takayuki Hidaka

Sadao Sato

Naoki Yasuda

Tomokazu Sakashita

Shinichi Okada

Hajime Takeya

Satoshi Ojika

Shigeru Utsumi

Ryota Kusano

Souhei Samejima

Kazuhito Sakurada

Akira Yagasaki

Tatsuya Hinata

A time average peak value of low frequency magnetic noise or low frequency conductive noise generated from a power supply device which drives a Hall thruster is suppressed without mass of a satellite significantly increased. A pulse width control circuit () of a Hall thruster power supply device () outputs a spread signal () obtained by performing spread spectrum on a pulse signal based on a control signal (). A voltage output circuit () outputs output voltage () to a Hall thruster () in accordance with the spread signal () output by the pulse width control circuit ().

Hall thruster power supply device and control method of hall thruster power supply device

A power supply device (-) includes: a substrate () on which an electric component () is mounted; a chassis () including a chassis surface () to be a surface facing one surface () of the substrate (); and cured insulating resin (-) to be placed between the one surface () of the substrate () and the chassis surface () so as to be connected to the one surface () and the chassis surface (), the cured insulating resin (-) having a thermal conductivity between 1 W/mK and 10 W/mK inclusive.

Power supply device

A power conversion apparatus () includes a plurality of power conversion units () each having a function of converting an input direct current voltage to a different direct current voltage, and a control unit () that controls the plurality of power conversion units () in accordance with a target value Vaim for the sum of voltages output from the plurality of power conversion units (). When making one or more of the power conversion units () output a first voltage which is fixed and making a different one of the power conversion units () output a second voltage which is adjusted in accordance with the target value Vaim, the control unit () repeatedly switches a power conversion unit () to output the second voltage at least between two of the power conversion units ().

Power conversion apparatus and electric propulsion system

On a printed wiring board obtained by a method of manufacturing a printed board, a predetermined component is to be mounted on at least one of a front surface side and a back surface side. The manufacturing method includes preparing a CFRP core, forming a through hole so as to penetrate the CFRP core from the front surface side to the back surface side and include a region in which the component is to be mounted when viewed in a plan view, and embedding a GFRP core having insulating properties within the through hole by filling the through hole with a resin having insulating properties and curing the resin. According to the manufacturing method, the component mounted on the printed board is not affected by a stray capacitance due to a CFRP, and it is not difficult to form a circuit.

Method of manufacturing printed wiring board, and printed wiring board

By adding a suppression amount for suppressing an overshoot or undershoot that attenuates with time during an overshoot or undershoot period, the overshoot or undershoot can be suppressed within a short time and the output can be made close to a normal value. When an output has overshot, an overshoot suppression amount including a time-dependent attenuation suppression amount is added to an output feedback control amount, the time-dependent attenuation suppression amount being defined in a period during which the output overshoots. Alternatively, when the output has undershot, an undershoot suppression amount including a time-dependent attenuation suppression amount is added to the output feedback control amount, the time-dependent attenuation suppression amount being defined in a period during which the output undershoots.

Control circuit and control method for inhibit overshoot and undershoot in power conversion device

A method of manufacturing a printed wiring board () includes the steps of: forming a core including carbon fiber reinforced plastic having a primary through hole (); forming a first adhesive member () on a lower surface of the core to cover the primary through hole (); charging an insulating member into the primary through hole (); forming a second adhesive member () on an upper surface of the core; forming a third adhesive member () below the first adhesive member (); forming a fourth adhesive member () on the second adhesive member (); and forming interconnections on the core.

Method of manufacturing printed wiring board

A method of manufacturing a circuit board includes: forming a first through hole in a core material; forming a first conductive film on an inner wall of the first through hole; forming an insulating layer on both surfaces of the core material and in the first through hole; forming a second through hole in the insulating layer in the first through hole; forming a second conductive film on an inner wall of the second through hole; and forming, on surfaces of the insulating layers formed on the both surfaces of the core material, a signal circuit layer electrically connected to the second conductive film.

Method for manufacturing a circuit board

Disclosed herein is a control device for a DC/DC converter, in which FB control and FF control are combined to estimate an output voltage of a nonlinear dynamic system while guaranteeing stability. The control device includes a FB controller which generates a first time value for switch-off timing as the amount of feedback control, a machine learning controller which generates a second time value for switch-off timing as the amount of FF control, and a difference time calculator which obtains a difference between the first time value and the second time value and transmits a difference signal to the drive circuit. The machine learning controller calculates a second time value by multiplying the deviation between the target value of the machine learning control and the estimation value from leaning history in certain sampling by &#x3b1;=A&#xb7;e&#xd7;p(&#x2212;&#x3bb;&#xd7;n) (A: a factor (except for zero) for suppressing the first undershoot, &#x3bb;: a factor (constant except for zero) for suppressing the second undershoot, and n: an integer indicating the nth sampling).

Control device for DC/DC converter

An object of the invention is to provide a printed circuit board that has an excellent heat dissipation performance and excellent reliability, and its manufacturing method. The printed circuit board includes: prepregs () and () being cured after each covering the surfaces of a metal plate () provided with first throughholes () therein and the inner walls of the first throughholes (); prepregs () and () being cured after glass clothes () and () are sandwiched between the prepregs () and (), and the prepregs () and (), respectively; and second throughholes () that connect wiring layers () and (), and () and () provided on both surfaces of prepregs () and (), respectively. The prepregs () and () and the prepregs () and () are characterized in that they contain inorganic filler. Furthermore, the prepregs () and () and the prepregs () and () may contain elastomer.

Printed circuit board and method of manufacturing the same

A CFRP core including a CFRP layer has a primary through hole. An adhesive member coats a wall surface of the primary through hole, and has a secondary through hole extending within the primary through hole. An electrically conductive layer is formed on a wall surface of the secondary through hole for electrically connecting upper and lower signal interconnections via the secondary through hole. A coating layer coats an outer peripheral edge of the CFRP core as seen in a plan view. Thereby, a printed interconnection board with low thermal expansivity and high thermal conductivity capable of preventing exfoliation of a CFRP layer on a side surface of a substrate using CFRP as a core, as well as preventing falling-off of carbon powders from the CFRP layer, and a method of manufacturing the same can be obtained.

Printed interconnection board having a core including carbon fiber reinforced plastic

A power supply apparatus for controlling an ion accelerator includes a controller configured to adjust magnitude of ion acceleration in the ion accelerator. The controller controls an anode voltage applied to an anode electrode of the ion accelerator, a gas flow rate of gas flowing through a gas flow rate regulator of the ion accelerator, and magnetic flux density at an ion exit of the ion accelerator to satisfy a formula given as follows: where S is a sectional area of the ion exit [m]; d is an ion accelerating region length [m]; &#x3b2; is a magnetic flux bias ratio; Va is anode voltage [V]; Q is gas flow rate [sccm]; and B is magnetic flux density at the ion exit [T].

Power supply apparatus

A power supply apparatus for controlling a Hall thruster which is an ion accelerator includes an anode power supply for applying anode voltage Va to an anode of the Hall thruster, inner and outer coil power supplies for supplying coil current Ic to each of inner and outer magnetic field generating coils of the Hall thruster, a gas flow rate controller for regulating gas flow rate Q via a gas flow rate regulator, and a control unit. The control unit adjusts the magnitude of ion acceleration by the Hall thruster by controlling the anode voltage Va, the gas flow rate Q and the coil current Ic according to a quantity expressed by a function related to the anode voltage Va and the coil current Ic.

Growing community of inventors

Chiyoda-ku, Japan

Hiroyuki Osuga