Abstract: Provide are a power reception device, a wearable device, and a non-contact power feeding system that can improve the transmission efficiency while suppressing upsizing of the circuit thereof. A power reception device (3) includes a variable capacitance circuit (100) and a power reception coil (41) constituting a resonance circuit together with the variable capacitance circuit (100), in which the variable capacitance circuit (100) includes a first capacitor (C1) and a second capacitor (C2) connected in parallel to each other, a first switch (Tr1) connected in series to one end side of the first capacitor (C1), and a switch control circuit (110) that controls turning on and off of the first switch (Tr1) and includes a first comparator (OP1) that supplies a first control voltage to the first switch (Tr1) according to a comparison result between a reference voltage and an AC voltage applied to the second capacitor (C2).

Abstract: A robot control apparatus for a more precise seam tracking operation, includes: a storage unit in which teaching data is stored; an accepting unit that accepts a sensing result of a laser sensor, from a robot including a working tool and the laser sensor attached to the working tool and configured to detect a shape of a working target before an operation of the working tool; and a control unit that moves the working tool based on the teaching data, corrects the movement of the working tool based on the sensing result, and adjusts an angle about a tool axis such that an operation point indicated by the sensing result is at a center of a field of view of the laser sensor. Accordingly, an operation line can be detected near the center of the field of view of the laser sensor, and thus more precise detection is possible.

Abstract: A memory in which information that is used in a tracking operation is to be temporarily stored, information cannot be accumulated in the memory when the accumulating intervals and the reading intervals do not match each other. A robot control apparatus includes: a memory; an accepting unit that accepts a sensing result of a laser sensor detecting a shape of a working target before an, and accumulates information according to the sensing result, in the memory. The memory management unit that, in a case in which the memory is running short of free space, deletes the information in the memory; and a control unit that moves the working tool based on teaching data, and corrects the movement of the working tool based on the information according to the sensing result stored in the memory.

Abstract: A power system includes a plurality of power conditioners, and a central management device that manages the plurality of power conditioners. The central management device includes a detector and an index calculator. The detector detects regulation subject power. The index calculator calculates an index for controlling individual output powers of the plurality of power conditioners such that the regulation subject power matches with target power. Each of the plurality of power conditioners includes a target power calculator and a controller. The target power calculator calculates the individual target power of the power conditioner based on an optimization problem using the index. The controller regulates the individual output power to the individual target power.

Abstract: A metal powder contains not less than 0.10 mass % and not more than 1.00 mass % of at least one of chromium and silicon, and a balance of copper. The total content of the chromium and the silicon is not more than 1.00 mass %. In accordance with an additive manufacturing method for this metal powder, an additively-manufactured article made from a copper alloy is provided. The additively-manufactured article has both an adequate mechanical strength and an adequate electrical conductivity.

Abstract: A signal processor is configured to perform a process equivalent to performing a series of fixed-to-rotating coordinate conversion, a predetermined process and then rotating-to-fixed coordinate conversion, while maintaining linearity and time-invariance. The signal processor performs a process given by the following matrix G: G = [ F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j - F ? ( s + j ? ? ? 0 ) - F ? ( s - j ? ? ? 0 ) 2 ? j F ? ( s + j ? ? ? 0 ) + F ? ( s - j ? ? ? 0 ) 2 ] where F(s) is a transfer function representing the predetermined process, ?0 is a predetermined angular frequency and j is the imaginary unit.

Abstract: In order to solve a problem that it is not possible to properly detect and output charge insufficiency of a power storage device in a case where it is not charged to a fully charged state, a wireless power supply management apparatus used for a wireless power supply system configured to repeatedly charge and discharge a power storage device includes a detecting portion that acquires, for one or more charge periods, information regarding insufficiency of electric power charged in each charge period, and detects charge insufficiency of the power storage device using the acquired information; and an output portion that performs output according to a result of the detection by the detecting portion. Accordingly, it is possible to properly detect charge insufficiency of a power storage device.

Abstract: A drive circuit performs switching between an on-state and an off-state of a PIN diode, the drive circuit being provided with a switching element and a switching element, a drive power supply, and a current limiting resistor that adjusts a forward current of the PIN diode. When the switching element is in an on-state and the switching element is in an off-state, the PIN diode is switched to the on-state by applying a forward voltage to the PIN diode from the drive power supply via the current limiting resistor, and when the switching element is in the off-state and the switching element is in the on-state, the PIN diode is switched to the off-state by applying, not via the current limiting resistor, a reverse voltage to the PIN diode from the drive power supply.

Abstract: In a PIN diode drive circuit, a forward voltage is applied to a PIN diode through a first switching element and a reverse voltage is applied to the PIN diode through a second switching element. A limiting unit limits an increase rate of an absolute value of a reverse recovery current to a value smaller than a threshold value, the reverse recovery current flowing through the PIN diode when a voltage applied to the PIN diode changes from a forward voltage to a reverse voltage. The threshold value is less than 1 time and 0.5 times or more of a maximum value of the increase rate when a second peak appears regarding the reverse recovery current.

Abstract: A plasma generating device is an inductively coupled plasma generating device comprising an antenna coil that generates plasma in a vacuum chamber, a high-frequency power source that is connected to a reference potential to be referred for plasma potential and that applies high-frequency voltage to the antenna coil, and a resonance circuit provided between the antenna coil and the high-frequency power source. The resonance circuit comprises a first series reactance element that is connected in series to one end portion of the antenna coil and has at least a capacitance component and a second series reactance element that is connected in series to the other end portion of the antenna coil and has at least a capacitance component. The circuit configuration at one side and the circuit configuration at the other side are electrically symmetrical.

Abstract: Provided is an impedance matching device for matching an impedance between a high-frequency power source and a load. The impedance matching device pertaining to the present invention is provided with: a matching circuit having variable capacitors, a capacitance of which is adjusted by an ON/OFF operation of a plurality of switches; a switch control unit for performing control for causing states of the switches of the variable capacitors to coincide with a target state in order to adjust the capacitance of the variable capacitors; and a switch state evaluation unit for evaluating whether a switch is in a state requiring suppression of a temperature increase. The switch control unit is configured so that when the switch state evaluation unit evaluates that a switch of the variable capacitors is in a state requiring suppression of a temperature increase, control is performed for suspending changing of a switch state of the switch for a set period and suppressing a temperature increase in the switch.