Abstract: A fuel cell module has: a first stacked body including a plurality of unit cells stacked on each other; and a second stacked body including a plurality of magnetic body sheets stacked on each other. The magnetic body sheets includes a coil. The first stacked body is superposed on the second stacked body so as to be electrically connected to the coil. A conductor serving as a part of the coil is embedded in each magnetic body sheet. The conductor has a first end portion and a second end portion exposed from surfaces of each magnetic body sheet on opposite sides from each other. The first end portion of the conductor of one of a set of magnetic body sheets adjacent to each other, among the magnetic body sheets, contacts the second end portion of the conductor of the other of the set of magnetic body sheets.

Abstract: A control device for a converter including a one-phase or multiple-phase converter circuit includes: a magnetic coupling determination unit configured to determine whether the converter circuit is a magnetically coupled circuit in which a reactor of the converter circuit is in a magnetically coupled state; and a control unit configured to change a control method for the converter according to a determination result of the magnetic coupling determination unit.

Abstract: To provide a power conversion device configured to evenly pass current through phases and to achieve high power conversion efficiency in a wide current range. A power conversion device comprising conversion parts which are coupled in parallel to each other, which are capable of voltage conversion, and each of which includes a coil, wherein the power conversion device comprises M (M is a natural number of 2 or more) sets of conversion sets including the conversion parts of N phases (N is a natural number of 2 or more), and the coils of the conversion parts are capable of magnetic coupling to each other; wherein the power conversion device includes a controller configured to change a driving phase number X of the conversion parts according to a system requirement.

Abstract: A control device of a multi-phase converter having N converter circuits connected in parallel includes: a determination unit configured to determine each share ratio of the N converter circuits to unevenly share input current to the multi-phase converter among the N converter circuits such that a conversion efficiency indicating a ratio of output power from the multi-phase converter with respect to input power to the multi-phase converter is higher in the case where the input current is unevenly shared by the N converter circuits compared to the case where the input current is evenly shared by the N converter circuits when the number of driven converter circuits is one or more and N?1 or less and the start condition is satisfied; and a diagnosis unit configured to diagnose an abnormality of the N converter circuits when the N converter circuits are driven in accordance with the determined share ratios.

Abstract: A control device of a power supply system includes a processor configured to set a sampling period, at which measurement values of a reactor current flowing through a reactor of a DC-DC converter and measured by an ammeter are sampled, so as to minimize a sum of differences between the length of a first period in a switching cycle of a switching element of the DC-DC converter and an integer multiple of the sampling period and between the length of a second period in the switching cycle and an integer multiple of the sampling period, the reactor current increasing during the first period and decreasing during the second period; sample, at intervals of the sampling period, measurement values of the reactor current measured by the ammeter; and average measurement values sampled in the switching cycle, thereby measuring an average of the reactor current in the switching cycle.

Abstract: A fuel cell system includes: a fuel cell unit; first and second supply systems; a switching device; a switching control unit, when required power of the fuel cell unit is equal to or smaller than a threshold; an open circuit voltage obtaining unit; and a supply system control unit.

Abstract: A controller of a power supply system includes a memory configured to store a self-inductance and a mutual inductance of two reactors included in a boost converter; and a processor configured to determine a present operating state of the boost converter, based on a ratio of an input voltage into the boost converter to an output voltage therefrom, a duty ratio applied to switching elements of the boost converter, the self-inductance, and the mutual inductance, the present operating state being one of operating states among which the waveform of a reactor current differs; and measure an average of the reactor current in a predetermined switching period of the switching elements, based on the input voltage, the output voltage, and the duty ratio, in accordance with the waveform of the reactor current corresponding to the present operating state of the boost converter.

Abstract: A fuel cell system is equipped with a fuel cell unit that is composed of a plurality of fuel cells including a first fuel cell and a second fuel cell, a first supply device and a second supply device that supply reactive gas to the first fuel cell and the second fuel cell respectively, and a control device that controls running of the first fuel cell and the second fuel cell and operation of the first supply device and the second supply device. The control device suspends electric power generation by the first fuel cell and drives the first supply device to hold an opening circuit voltage of the first fuel cell within a target range, and suspends electric power generation by the second fuel cell and stops driving the second supply device when an output P required of the fuel cell unit is equal to 0.

Abstract: A fuel cell system includes a fuel cell, a supply device configured to supply a cathode gas to the fuel cell; and a control unit configured to execute recovery processing of causing a catalyst of the fuel cell to recover from performance deterioration by lowering an output voltage of the fuel cell. The control unit is configured to, when the recovery processing that has been executed is completed, control the supply device to place the fuel cell in a power generation paused state while making a stoichiometric ratio of the cathode gas lower than a stoichiometric ratio of the cathode gas in a normal operation state that is a state before execution of the recovery processing.

Abstract: A fuel cell system includes: a fuel cell unit; first and second supply systems; a switching device; a switching control unit; an open circuit voltage obtaining unit; and a supply system control unit.

Abstract: A fuel cell system includes: a secondary battery; first and second fuel cells; first and second scavenging devices configured to scavenge the first and second fuel cells, respectively; and a control device configured to perform a first scavenging process of scavenging the first fuel cell by driving the first scavenging device using a charged power of the secondary battery when the first and second fuel cells are in a power generation stopped state and to perform a second scavenging process of scavenging the second fuel cell by driving the second scavenging device using a generated power of the first fuel cell when the first fuel cell is in a power generation state and the second fuel cell is in the power generation stopped state.

Abstract: A fuel cell system includes: a fuel cell; a supply device; and a control unit configured to lower output voltage of the fuel cell to a target value so as to execute recovery processing to recover power generation performance of the fuel cell. In a case of having an execution request of the recovery processing, the control unit restarts power generation of the fuel cell when open circuit voltage of the fuel cell is lowered to or smaller than a threshold value higher than the target value by controlling a flow rate of a cathode gas while the power generation of the fuel cell is paused, and the control unit executes the recovery processing while controlling an output current value of the fuel cell to be smaller than an idle current value that is an output current value of the fuel cell in an idle operation state.

Abstract: A fuel cell system includes: a first fuel cell stack and a second fuel cell stack; a supply passage connected to an inlet of oxidant gas in the first fuel cell stack; an discharge passage connected to an outlet of the oxidant gas in the second fuel cell stack; introduction unit that introduces water in the oxidant gas flowing through the discharge passage into the supply passage; and a controller configured to perform refresh control of the first fuel cell stack by lowering voltage of the first fuel cell stack, and operates, during the refresh control, the introduction unit while keeping the second fuel cell stack in an electric power generation state.

Abstract: The present invention provides a technique capable of satisfying both the restoration of an output voltage of a fuel cell and an improvement of electric power responsiveness in a fuel cell system in a situation in which its operation status is restored to a normal operation from an operation having low power generation efficiency. A controller updates a lower limit voltage threshold in accordance with the restoration of an FC voltage until the operation status is restored to a normal operation from an operation having low power generation efficiency, such as an intermittent operation and a warmup operation (step S1). The controller increases an FC current in accordance with the updated lower limit voltage threshold (steps S2 and S3) to thereby satisfy both the requirements of the restoration of the output voltage of the fuel cell stack and the improvement of the electric power responsiveness.

Abstract: A control device for a multi-phase converter including converter circuits of m phases of which each includes a switching element includes: a driven phase number control unit configured to control the multi-phase converter in n-phase driving or m-phase driving; a storage unit configured to store first and second patterns; a selection unit configured to select the first or second pattern while the multi-phase converter is stopped, an on/off control unit configured to perform on/off control on the switching elements of the number of driven phases; and a prediction unit configured to predict a predicted correlation value which is correlated with a time ratio which is a ratio of a time in which control in the m-phase driving is predicted to be performed to a time in which control in the n-phase driving is predicted to be performed in a predetermined time.

Abstract: A control device of a multi-phase converter having N converter circuits connected in parallel includes: a determination unit configured to determine each share ratio of the N converter circuits to unevenly share input current to the multi-phase converter among the N converter circuits such that a conversion efficiency indicating a ratio of output power from the multi-phase converter with respect to input power to the multi-phase converter is higher in the case where the input current is unevenly shared by the N converter circuits compared to the case where the input current is evenly shared by the N converter circuits when the number of driven converter circuits is one or more and N?1 or less and the start condition is satisfied; and a diagnosis unit configured to diagnose an abnormality of the N converter circuits when the N converter circuits are driven in accordance with the determined share ratios.

Abstract: A fuel cell module has: a first stacked body including a plurality of unit cells stacked on each other; and a second stacked body including a plurality of magnetic body sheets stacked on each other. The magnetic body sheets includes a coil. The first stacked body is superposed on the second stacked body so as to be electrically connected to the coil. A conductor serving as a part of the coil is embedded in each magnetic body sheet. The conductor has a first end portion and a second end portion exposed from surfaces of each magnetic body sheet on opposite sides from each other. The first end portion of the conductor of one of a set of magnetic body sheets adjacent to each other, among the magnetic body sheets, contacts the second end portion of the conductor of the other of the set of magnetic body sheets.

Abstract: A technique that suppresses excessive water drainage from a fuel cell is provided. A water drainage device that drains water from inside of a fuel cell includes: a purge gas supply system; an operation unit; a water drainage controller; and a water content acquirer. The operation unit receives a water drainage command from a water drainage switch configured to control execution of a purge process by the purge gas supply system. When the water content obtained by the water content acquirer is equal to or lower than a predetermined value, the water drainage controller performs either one of: (i) invalidating the received water drainage command; and (ii) changing a processing condition of the purge process to decrease an amount of water drained by the purge process, compared with an amount of water drainage when the obtained water content is higher than the predetermined value.

Abstract: A fuel cell system includes a fuel cell, a supply device configured to supply a cathode gas to the fuel cell; and a control unit configured to execute recovery processing of causing a catalyst of the fuel cell to recover from performance deterioration by lowering an output voltage of the fuel cell. The control unit is configured to, when the recovery processing that has been executed is completed, control the supply device to place the fuel cell in a power generation paused state while making a stoichiometric ratio of the cathode gas lower than a stoichiometric ratio of the cathode gas in a normal operation state that is a state before execution of the recovery processing.

Abstract: A fuel cell system comprises a fuel cell; a fuel cell controlling converter; an oxidizing gas supplier that is configured to supply an oxidizing gas to the fuel cell; and a controller that is configured to control a voltage and a current value of the fuel cell. In a first power generation state, the controller sets the voltage and the current value of the fuel cell according to a required output, based on a current-voltage characteristic of the fuel cell. In a second power generation state, the controller sets the voltage and the current value of the fuel cell according to the required output and a required amount of heat, to a voltage and a current value that provide a lower power generation efficiency than a power generation efficiency in the first power generation state. The controller reduces the required amount of heat in a process of changing over a power generation state from the second power generation state to the first power generation state.