Abstract: An AC generation circuit is attached to a secondary battery, and includes a circuit configured to generate an alternating current at both ends of the secondary battery, a current limiting element connected between a positive electrode side of the circuit and a positive element of the secondary battery and/or between a negative electrode side of the circuit and a negative electrode of the secondary battery, and a capacitor connected in parallel to the current limiting element.

Abstract: A battery characteristic reproduction device includes a processor configured to execute computer-readable instructions to perform. The processor is configured to extracting a smallest resistance value included in frequency characteristics of measured impedance of a battery, extracting a difference between a resistance value measured at a measurement point and a resistance value measured at an adjacent measurement point for each measurement point of each frequency included in the frequency characteristics, and reproducing the frequency characteristics of the impedance in the battery by configuring the smallest resistance value extracted as a first resistance component, configuring an equivalent circuit of the battery including the difference between the resistance values extracted as a second resistance component for each measurement point, and connecting the first resistance component and the equivalent circuit for each measurement point in series.

Abstract: An alternating current (AC) generation circuit includes a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a second end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor in parallel to the power storage, a series switch unit configured to connect the first capacitor and the second capacitor in series with the power storage, a first inductor connected between the positive electrode side of the power storage and the first end of the first capacitor, a second inductor connected between the second end of the second capacitor and the negative electrode side of the power storage, a third capacitor connected between the second end of the first capacitor and the negative electrode side of the power storage, and a fourth capacitor connected between the positive electrode side of the power storage and the first end of t

Abstract: A power supply apparatus (2) for supplying power to a plurality of loads (modn), the power supply apparatus including: a power source (4); an AC generation circuit (6) which is connected to the power source (4) and generates an AC voltage; an AC electric path (7) which is connected to the plurality of loads (modn) and to which the AC voltage is applied; and a transformer (8) which is provided between the AC generation circuit (6) and the AC electric path (7), in which an isolated DC/DC converter is not provided between the power source (4) and the AC generation circuit (6).

Abstract: A battery type determination system includes an electric circuit connected to a battery, and a battery type determination device that determines a type of the battery on the basis of a characteristic value of the electric circuit. The electric circuit includes an AC power supply having a variable frequency, and a capacitor circuit. The battery type determination device includes a resonance state detection unit that detects at least one resonance state in response to an AC signal output from the AC power supply, a resonance frequency detection unit that detects a resonance frequency in the resonance state, a resonance characteristic detection unit that uses the resonance frequency as a resonance characteristic of the battery, and a determination unit that determines whether or not the battery is of the same type as a reference battery by comparing the resonance characteristic of the battery with a reference resonance characteristic of the reference battery serving as a reference for the battery.

Abstract: An alternating current (AC) generation circuit includes a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a second end connected to a negative electrode side of the power storage, a third capacitor having a second end connected to the negative electrode side of the power storage, a fourth capacitor having a first end connected to the positive electrode side of the power storage, a first switch having a first terminal connected to the first end of the first capacitor, a second switch having a second terminal connected to the second end of the first capacitor, a third switch having a second terminal connected to the second end of the third capacitor, a fourth switch having a first terminal connected to the first end of the third capacitor, a first inductor connected between the second terminal of the first switch and the first terminal of the fourth switch, and a second inductor connected between the second te

Abstract: A temperature raising device includes a parallel circuit including a capacitor connected in parallel to a battery that is a temperature raising target, and an alternating current (AC) generation circuit connected to the parallel circuit. When capacitance of the capacitor is denoted by CP, an inductance component of the battery is denoted by LS, and a resistance component of the battery is denoted by RS, CP satisfies Inequality (1) and an angular frequency ? of the AC generation circuit satisfies Eq. (2).

Abstract: An AC generation circuit includes a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor to the power storage in parallel by connecting a second end of the first capacitor and the first end of the second capacitor and connecting the first end of the first capacitor and a second end of the second capacitor in accordance with a first control signal, a series switch unit configured to connect the first capacitor and the second capacitor to the power storage in series by connecting the second end of the first capacitor and the second end of the second capacitor in accordance with a second control signal, and an inductor connected between both terminals of the series switch unit.

Abstract: A temperature raising system includes an alternating current (AC) generation circuit connected to a power storage battery including one or more power storages and configured to generate an AC current, and a conductive member of a metallic conductor connected between a terminal portion of the power storage and the AC generation circuit or between two or more power storages. The conductive member includes a first path and a second path along which heat is generated by allowing the AC current to flow. The first path has a larger inductance component than the second path.

Abstract: A temperature raising device includes an alternating current (AC) generation circuit including a first capacitor having a first end connected to a positive electrode side of a power storage having an inductance component, a second capacitor having a first end connected to a negative electrode side of the power storage, a parallel switch unit configured to connect the first capacitor and the second capacitor to the power storage in parallel, and a series switch unit configured to connect the first capacitor and the second capacitor to the power storage in series, and a controller configured to alternately switch the state between a first state in which the parallel switch unit is in a conductive state and the series switch unit is in a non-conductive state and a second state in which the parallel switch unit is in the non-conductive state and the series switch unit is in the conductive state.

Abstract: An AC generation circuit includes a plurality of child circuits connected to positive electrodes and negative electrodes of a plurality of secondary batteries connected in series, wherein a negative electrode side of one of two adjacent child circuits among the plurality of child circuits and a positive electrode side of the other child circuit are connected at a first intermediate connection point, the first intermediate connection point is connected to a second intermediate connection point at which a negative electrode of one of two adjacent secondary batteries among the plurality of secondary batteries and a positive electrode of the other secondary battery are connected, and a capacitor is provided at least some of positions between one or more first intermediate connection points and one or more second intermediate connection points.

Abstract: An AC generation circuit is attached to a secondary battery, and includes a circuit configured to generate an alternating current at both ends of the secondary battery, a current limiting element connected between a positive electrode side of the circuit and a positive element of the secondary battery and/or between a negative electrode side of the circuit and a negative electrode of the secondary battery, and a capacitor connected in parallel to the current limiting element.

Abstract: A temperature raising device includes a switch element control unit that executes a duty ratio control process of increasing one duty ratio which is one of duty ratios of a first switch element and a second switch element and a duty ratio of a third switch element from 0% from an initial state where the first switch element, the second switch element, and the third switch element are in a non-energized state, and decreasing another duty ratio which is another of the duty ratios of the first switch element and the second switch element and the duty ratio of the third switch element from 100% from the initial state by an increased amount of the one duty ratio which is one of the duty ratios of the first switch element and the second switch element and the duty ratio of the third switch element, with respect to an AC generation circuit including a first capacitor, a second capacitor, the first switch element, the second switch element, and the third switch element.

Abstract: In a two-phase modulation type three-phase inverter control method having a pause section in which a pulse signal obtained by comparing a modulated wave signal for driving a motor and a carrier signal is not output, a pulse signal generation unit switches a first carrier signal to a second carrier signal when an electric angle of the motor is within the pause section for each of three phases.

Abstract: A charging system includes an AC power source, a plurality of rectifier circuits, a plurality of positive electrode side current cutoff circuits, and a control device. The plurality of rectifier circuits are connected between the AC power source and each of a plurality of battery modules. Each rectifier circuit supplies DC power obtained by rectifying AC power supplied from the AC power source to each battery module. The plurality of positive electrode side current cutoff circuits are connected between each of the plurality of battery modules and each of the plurality of rectifier circuits. Each positive electrode side current cutoff circuit automatically switches between conduction and cutoff of a current between each battery module and each rectifier circuit according to AC power input to each rectifier circuit.

Abstract: A charging system includes an AC power source, a plurality of circuit modules, and a control device. The plurality of circuit modules are connected between the AC power source and each of a plurality of battery modules. Each of the circuit modules supplies DC power obtained by rectifying AC power supplied from the AC power source to each of the battery modules. Each of the circuit modules includes two second capacitors in an A-phase electric line and a B-phase electric line, which disconnect a connection portion (for example, a wire) connecting the plurality of circuit modules from each of the battery modules in a direct current manner.

Abstract: A charging system includes: an alternating current (AC) power source; a plurality of opening/closing rectifying units composed of a plurality of rectifying circuits and a plurality of opening/closing circuits; and a control device. The plurality of rectifying circuits are connected to a plurality of modules formed by dividing a battery into the plurality of modules. The plurality of rectifying circuits supply direct current (DC) electric power obtained by rectifying AC electric power supplied from the AC power source to the plurality of modules. The plurality of opening/closing circuits switch between connection and disconnection between the AC power source and each of the plurality of modules.

Abstract: A power storage system capable of appropriately increasing a temperature of a power storage device is provided. A power storage system (10) includes a battery (31) and a plurality of AC application units (33). The battery (31) includes a string (31b) which is formed by a plurality of cells (31a) connected in series to each other. The battery (31) includes a plurality of modules (35) which are formed by dividing the string (31b) into a plurality of substrings in series. The plurality of AC application units (33) respectively apply alternating currents I having phases set to attenuate a voltage fluctuation at both ends (the positive electrode terminal (BP) and the negative electrode terminal (BN)) of the battery (31) to each of the plurality of modules (35).

Abstract: The present invention includes an AC generation circuit which is configured to be connected to a secondary battery having characteristics in which a resistance component of an impedance of the secondary battery decreases as a frequency of an alternating current flowing in the secondary battery rises from a low frequency and the resistance component increases as the frequency moves to a high frequency side from a frequency at which the resistance component is minimized and to raise the temperature of the secondary battery by circulating an alternating current at a frequency in a high frequency band higher than the frequency at which the resistance component is minimized in the secondary battery.