Abstract: Emission efficiency of a light-emitting element is improved. The light-emitting element has a pair of electrodes and an EL layer between the pair of electrodes. The EL layer includes a first light-emitting layer and a second light-emitting layer. The first light-emitting layer includes a fluorescent material and a host material. The second light-emitting layer includes a phosphorescent material, a first organic compound, and a second organic compound. An emission spectrum of the second light-emitting layer has a peak in a yellow wavelength region. The first organic compound and the second organic compound form an exciplex.

Abstract: A multicolor light-emitting element that utilizes fluorescence and phosphorescence and is advantageous for practical application is provided. The light-emitting element has a stacked-layer structure of a first light-emitting layer containing a host material and a fluorescent substance and a second light-emitting layer containing two kinds of organic compounds and a substance that can convert triplet excitation energy into luminescence. Note that light emitted from the first light-emitting layer has an emission peak on the shorter wavelength side than light emitted from the second light-emitting layer.

Abstract: An object of one embodiment of the present invention is to provide a novel organic compound. The organic compound is a triarylamine derivative. The triarylamine derivative has an aryl group including a skeleton in which a naphthyl group is bonded to a naphthylene group. The other two aryl groups are each independently a phenyl group, a biphenyl group, or a terphenyl group. These groups may each have a substituent. As the substituent, an alkyl group having 1 to 6 carbon atoms or a cycloalkyl group having 3 to 6 carbon atoms can be selected.

Abstract: A novel organic compound is provided. Alternatively, an organic compound that exhibits light emission with favorable chromaticity is provided. Alternatively, an organic compound that exhibits blue light emission with favorable chromaticity is provided. Alternatively, an organic compound with favorable emission efficiency is provided. Alternatively, an organic compound having a high carrier-transport property is provided. Alternatively, an organic compound with favorable reliability is provided. An organic compound including at least one amino group in which any one of a substituted or unsubstituted dibenzofuranyl group, a substituted or unsubstituted dibenzothiophenyl group, and a substituted or unsubstituted carbazolyl group is boneded to any one of a substituted or unsubstituted naphthobisbenzofuran skeleton, a substituted or unsubstituted naphthobisbenzothiophene skeleton, and a substituted or unsubstituted naphthobenzofuranobenzothiophene skeleton is provided.

Abstract: A novel light-emitting device is provided. Alternatively, a light-emitting device having a long driving lifetime at high temperature is provided. The light-emitting device includes an anode, a cathode, and an EL layer positioned between the anode and the cathode. The EL layer includes a first layer, a second layer, a third layer, and a light-emitting layer in this order from the anode side. The first layer includes a first organic compound and a second organic compound. The second layer includes a third organic compound. The third layer includes a fourth organic compound. The light-emitting layer includes a fifth organic compound and an emission center substance. The first organic compound exhibits an electron-accepting property with respect to the second organic compound. A difference between HOMO levels of the fourth organic compound and the fifth organic compound is less than or equal to 0.24 eV.

Abstract: A novel organic compound is provided. An organic compound that emits light with high chromaticity is provided. An organic compound that emits blue light with high chromaticity is provided. An organic compound with high emission efficiency is provided. An organic compound having an excellent hole-transport property is provided. An organic compound having high reliability is provided. An organic compound that has a naphtho[2,3-b;7,6-b?]bisbenzofuran skeleton or a naphtho[2,3-b;7,6-b?]bisbenzothiophene skeleton and has a molecular weight of less than or equal to 5000 is provided. The present inventors have found that the organic compound is a significantly effective skeleton as a luminophor of a light-emitting element. The organic compound has high emission efficiency and exhibits favorable blue light emission; thus, a light-emitting element using the organic compound can be a blue light-emitting element with high emission efficiency.

Abstract: A fuel cell vehicle may include: an electric traction motor; an inverter; a fuel cell system; a first boost converter including first low voltage terminals connected to a fuel cell and first high voltage terminals connected to the inverter, the first boost converter including a first capacitor connected between positive and negative terminals of the first high voltage terminals; a first relay connected between the first boost converter and the inverter; and a controller, wherein the controller is configured to: shut down the fuel cell system; while a voltage of the fuel cell is higher than a voltage threshold, discharge the first capacitor and maintain a voltage thereof higher than the voltage of the fuel cell; and when the voltage of the fuel cell becomes lower than the voltage threshold, stop discharging the first capacitor and disconnect the first boost converter from the inverter by opening the first relay.

Abstract: A fuel cell vehicle may include: an electric traction motor; an inverter; a fuel cell system; a first boost converter including first low voltage terminals connected to a fuel cell and first high voltage terminals connected to the inverter, the first boost converter including a first capacitor connected between positive and negative terminals of the first high voltage terminals; a first relay connected between the first boost converter and the inverter; and a controller, wherein the controller is configured to: shut down the fuel cell system; while a voltage of the fuel cell is higher than a voltage threshold, discharge the first capacitor and maintain a voltage thereof higher than the voltage of the fuel cell; and when the voltage of the fuel cell becomes lower than the voltage threshold, stop discharging the first capacitor and disconnect the first boost converter from the inverter by opening the first relay.

Abstract: An electrical source control apparatus has a selecting device for selecting one switching element from at least two switching elements each of which constitutes predetermined arm element whose switching state should be changed to perform the electrical power conversion, when the electrical power converter performs the electrical power conversion with either one of the first and the second electricity storage apparatuses; and a controlling device for controlling the electrical power converter to change a switching state of the selected one switching element while keeping a switching state of another one switching element in an ON state, the selecting device newly selects the one switching element to reduce a difference between temperatures of the at least two switching elements each of which constitutes predetermined arm element.

Abstract: An electrical source control apparatus has a selecting device for selecting one switching element from at least two switching elements each of which constitutes predetermined arm element whose switching state should be changed to perform the electrical power conversion, when the electrical power converter performs the electrical power conversion with either one of the first and the second electricity storage apparatuses; and a controlling device for controlling the electrical power converter to change a switching state of the selected one switching element while keeping a switching state of another one switching element in an ON state, the selecting device newly selects the one switching element to reduce a difference between temperatures of the at least two switching elements each of which constitutes predetermined arm element.

Abstract: An electrically driven vehicle includes a battery, front and rear motors, front and rear inverters, and a distributor. The front motor and the front inverter are arranged in a front region of the vehicle. The front inverter is configured to convert battery electric power into an alternating-current electric power, and supply the alternating-current electric power to the front motor. The rear motor and the rear inverter are arranged in a rear region of the vehicle. The rear inverter is configured to convert battery electric power into an alternating-current electric power, and supply the alternating-current electric power to the rear motor. The distributor is configured to distribute the electric power of the battery to the front inverter and the rear inverter. One of the rear inverter and another device that is attached to and removed from the vehicle together with the rear inverter is provided with the distributor.

Abstract: Flux concentration cores that encircle bus bars are arranged at different heights. When viewed from an extending direction (a Z-direction) of the bus bars, the first flux concentration core and the second flux concentration core that are adjacent to one another partially overlap each other, and the second flux concentration core and the third flux concentration core that are adjacent to each other partially overlap each other. Therefore, the flux concentration cores are able to be arranged around the bus bars even when the spaces between the bus bars are narrow.

Abstract: A control device for a vehicular power system including an induction motor includes an electronic control unit configured to detect a locked state of the induction motor, calculate a lock-release slip frequency that causes an electric frequency to be outside a lock range, and control the induction motor so that a slip frequency of the induction motor becomes equal to the lock-release slip frequency when the locked state is detected.

Abstract: Flux concentration cores that encircle bus bars are arranged at different heights. When viewed from an extending direction (a Z-direction) of the bus bars, the first flux concentration core and the second flux concentration core that are adjacent to one another partially overlap each other, and the second flux concentration core and the third flux concentration core that are adjacent to each other partially overlap each other. Therefore, the flux concentration cores are able to be arranged around the bus bars even when the spaces between the bus bars are narrow.

Abstract: Provided is a technique for mass-producing a conductor to which is fixed a current detection head that detects the value of current flowing in the conductor, and in which the relationship between the detection value and the current value is stabilized. The head comprises a lens, a magneto-optical element, a conductor, and a fixing member, and the lens, the magneto-optical element, and the conductor are respectively fixed to the fixing member. An optical system is formed using the current detection head such that light is guided through the lens to the magneto-optical element, and light affected by a magneto-optical effect due to the magneto-optical element is guided to the lens. All of the members contributing to current detection are fixed to the fixing member, and therefore the relative positional relationships of all the members contributing to current detection are uniquely determined, enabling conductors with little variation in current detection characteristics to be mass-produced.

Abstract: An art of measuring a current with a suppressed influence of a switching noise is provided. The art disclosed by the present specification is a current sensor that measures an output current of a switching circuit. The current sensor is equipped with a magneto-optical element that is arranged at a current measurement point, a light source that radiates light onto the magneto-optical element, and a light receiver that receives transmitted light or reflected light of the magneto-optical element. The light source radiates light in synchronization with a carrier signal of the switching circuit. Light is radiated in synchronization with the carrier signal, and a current is measured with the aid of the light. Due to synchronization with the carrier signal, the current can be measured at timings other than a switching timing resulting from a PWM signal that is generated on the basis of the carrier signal.

Abstract: A control device for a vehicular power system including an induction motor includes an electronic control unit configured to detect a locked state of the induction motor, calculate a lock-release slip frequency that causes an electric frequency to be outside a lock range, and control the induction motor so that a slip frequency of the induction motor becomes equal to the lock-release slip frequency when the locked state is detected.

Abstract: A current sensor (1) that is used to detect a current that flows through a bus bar (100) includes: a base (10) that is attached to the bus bar (100); a magnetic thin film (20) that is mounted on the base (10); a luminescent device that irradiates light to the magnetic thin film (20); a photoreceptor device that detects light that is irradiated from the luminescent device to the magnetic thin film (20) and that is reflected from the magnetic thin film (20); a differential amplifier that converts an optical signal, detected by the photoreceptor device, into the current that flows through the bus bar (100); and an accommodation member (30) and pins (40) that restrict relative rotation of the magnetic thin film (20) with respect to the bus bar (100).

Abstract: Provided is a technique for mass-producing a conductor to which is fixed a current detection head that detects the value of current flowing in the conductor, and in which the relationship between the detection value and the current value is stabilized. The head comprises a lens, a magneto-optical element, a conductor, and a fixing member, and the lens, the magneto-optical element, and the conductor are respectively fixed to the fixing member. An optical system is formed using the current detection head such that light is guided through the lens to the magneto-optical element, and light affected by a magneto-optical effect due to the magneto-optical element is guided to the lens. All of the members contributing to current detection are fixed to the fixing member, and therefore the relative positional relationships of all the members contributing to current detection are uniquely determined, enabling conductors with little variation in current detection characteristics to be mass-produced.