Patent application number | Description | Published |
20100007319 | CONVERTER CONTROL DEVICE - A converter device which is configured by connecting three converter circuits in parallel is provided between a secondary battery serving as a first power supply and a fuel cell serving as a second power supply. Two differential ammeters are placed on three reactors corresponding to the three converter circuits. A control unit includes a passing electric power calculation module which calculates electric power passing through the converter device on the basis of detected values of the two differential ammeters, an electric power equalization module which performs equalization of passing electric power between the respective converter circuits which constitute the converter device, a module for changing the number of drive phases which changes the number of drive phases of the converter device in response to the passing electric power, and a voltage conversion control module which controls the converter device and executes a desired voltage conversion. | 01-14-2010 |
20100047663 | FUEL CELL SYSTEM - There is disclosed a fuel cell system which can control an output current of a fuel cell even if an error occurs in split flow control of an oxidizing gas. The fuel cell system includes a fuel cell and a feed device for supplying the oxidizing gas under pressure to the fuel cell. A feed channel is connected to a discharge channel by a bypass channel so that the oxidizing gas flows while bypassing the fuel cell. The system includes a regulator valve and a bypass valve which adjust the split flow of the oxidizing gas to the bypass channel and the fuel cell. When the regulator valve or the bypass valve has an error, a controller stops the control of the output current of the fuel cell by control of the regulator valve and switches the control to a control of the output current of the fuel cell by control of the feed device. | 02-25-2010 |
20100055522 | FUEL CELL SYSTEM - When a power generation instruction value for a fuel cell is reduced during warm-up of the fuel cell by a low power generation efficiency operation as compared to a normal operation and when supply of a reactant gas to the fuel cell cannot be controlled so as to follow the reduction of the power generation instruction value, the reactant gas supply to the fuel cell is reduced and the output voltage to the fuel cell is increased. Thus, it is possible to charge an excessive power equivalent to a difference between a fuel cell generation amount and the power generation instruction value into a capacitance component of the fuel cell, so that the power supplied to the external load of the fuel cell coincides with the power generation instruction value. Thus, when a power request for the fuel cell during the low-efficiency operation is suddenly reduced, it is possible to perform control so that the excessive power is not supplied to the external load. | 03-04-2010 |
20100068575 | FUEL CELL SYSTEM - A fuel cell system includes: a fuel cell stack which receives a fuel gas and an oxidation gas to generate a power; an air compressor which supplies the oxidation gas to the fuel cell stack; and a controller which reduces the oxidation gas flow rate supplied from the air compressor to the fuel cell stack in consideration of discharge from a capacitance component of the fuel cell stack when decreasing the output voltage of the fuel cell stack. When the output voltage of the fuel cell stack has dropped, the fuel cell system can control a cell operation in consideration of the discharge from the capacitance component of the fuel cell stack to an external load. | 03-18-2010 |
20100092819 | FUEL CELL SYSTEM - When a request power for a fuel cell is smaller than a predetermined value, a fuel cell system stops the supply of an oxidizing gas to the fuel cell and lowers the output voltage of the fuel cell from a use upper limit voltage to a reduction voltage to perform catalyst activation processing. When the output voltage of the fuel cell lowers to an air blow voltage because of the shortage of the oxidizing gas, the fuel cell system re-supplies the oxidizing gas to recover the output voltage of the fuel cell. | 04-15-2010 |
20100112401 | FUEL CELL SYSTEM, ELECTRODE CATALYST DEGRADATION JUDGMENT METHOD, AND MOVING BODY - Output voltage of a fuel cell | 05-06-2010 |
20100127710 | FUEL CELL SYSTEM - A fuel cell system is configured to have: a voltage superimposing unit that superimposes a predetermined AC signal on an output voltage of a fuel cell; a unit that detects an output voltage value of a battery device, the output voltage value varying as the fuel cell output voltage value on which the AC signal has been superimposed varies; a battery device voltage comparison unit that compares the detected battery device output voltage value with a predetermined threshold voltage; and a measurement permission determination unit that determines whether the AC impedance measurement is permitted or not based on whether or not the battery device output voltage value exceeds the threshold voltage. The fuel cell system can protect the battery device in the impedance measurement of the fuel cell based on an AC impedance method. | 05-27-2010 |
20100136451 | FUEL CELL SYSTEM AND CURRENT CONTROL METHOD OF SAME - A control unit | 06-03-2010 |
20100151341 | FUEL CELL SYSTEM - Provided is a fuel cell system capable of accurately estimating I-V characteristics of a fuel cell. An impedance measurement section measures an impedance of the fuel cell and obtains a voltage drop caused by a direct-current resistance. An air stoichiometry judgment section detects the amount of oxidant gas supplied to the fuel cell and thereby judges whether or not the air stoichiometry ratio is 1 or higher at this time point. An estimated I-V characteristics line creation section determines that the remaining voltage component consists entirely of an activation voltage when the air stoichiometry ratio notified by the air stoichiometry judgment section is 1 or higher, while determining that the remaining voltage drop component includes the combination of the activation overvoltage and voltage drop corresponding to the change in the electromotive voltage when the notified air stoichiometry ratio is below 1. | 06-17-2010 |
20100159342 | FUEL CELL SYSTEM AND ITS CONTROL METHOD - Disclosed is a fuel cell system including a fuel cell which generates a power, and control means for decreasing the amount of a reactant gas to be supplied to the fuel cell to an amount smaller than that during normal power generation to realize low-efficiency power generation of the fuel cell. The control means sets the voltage lower limit value of the fuel cell so that the amount of an anode gas (pumping hydrogen) to be formed in a cathode of the fuel cell during the low-efficiency power generation is a predetermined amount or less. | 06-24-2010 |
20100167148 | TEMPERATURE CONTROL SYSTEM FOR FUEL CELL - Provided is a temperature control system which can suppress a cell voltage fluctuation even in the case of starting under a low-temperature environment. The temperature control system for a fuel cell according to the present invention circulates a heat transfer medium through the fuel cell to control the temperature of the fuel cell. The system is characterized by including circulation control means for circulating, through the fuel cell, the heat transfer medium having a flow rate larger than that for a normal operation during a low-temperature operation. According to such a constitution, the flow rate of the heat transfer medium (cooling water or the like) for low-temperature start is set to a flow rate larger than that of the heat transfer medium for normal start, so that a temperature fluctuation among cells can be suppressed even in the case of warm-up for the low-temperature start, and as a result, the cell voltage fluctuation can be suppressed. | 07-01-2010 |
20100203409 | FUEL CELL SYSTEM AND ITS CONTROL METHOD - A fuel cell system includes; a fuel cell which generates electricity by using a fuel gas and an oxidant gas as reaction gases; current control means which controls current of a fuel cell; voltage control means which controls voltage of the fuel cell; and heat value control means which calculates a heat value required by the fuel cell system and decides a target current value of the current control means and a target voltage value of the voltage control means so as to generate the calculated necessary heat amount, thereby controlling the heat value. Thus, it is possible to supply a heat required for the fuel cell system without increasing the size of the fuel cell system. | 08-12-2010 |
20100209791 | FUEL CELL SYSTEM - Provided is a fuel cell system which can perform sufficient scavenging during a current system operation even if required sufficient scavenging during the previous system stop is not performed. When a control device detects that a system start command is input and a low temperature mode flag is turned “ON”, the control device compares a measured impedance during the previous system stop stored in a measured impedance memory to a low temperature start target impedance It stored in a reference impedance memory, to judge whether or not a scavenging process performed during the previous system stop has been insufficient. When the control device judges that the scavenging process is insufficient, an immediate warm-up operation is executed during the current system operation to immediately raise the temperature. | 08-19-2010 |
20100237694 | Vehicle mounted converter - An object is to miniaturize device size in a vehicle mounted converter. The vehicle mounted converter includes a plurality of inductors, a switching unit for switching current path, an external power acquisition unit for acquiring alternating current power from a power generation source provided separately from the mounted vehicle, and a switching means for switching a circuit connection state to a connection state of either a boost connection state for connecting one end of the inductors to a path to a battery for vehicle drive power supply and connecting the switching unit to the other end of the inductors, or a charging connection state for connecting one end of one of the plurality of inductors to the path to the battery, disconnecting one end of the remaining inductors from the path to the battery and connecting to the external power acquisition unit, and connecting the other end of the inductors to the switching unit. | 09-23-2010 |
20100248055 | FUEL CELL SYSTEM AND METHOD FOR LIMITING CURRENT THEREOF - In a fuel cell system comprising a fuel cell with plural cells and performing processing for limiting a supply current to a load by performing a compensation computation with respect to a system-request current corresponding to a system-request power requested by the system based on the lowest cell voltage in the cells, the compensation computation being performed for limiting the supply current through a PI compensation using, as a reference value, a current value of the system-request current as of the time when the lowest cell voltage falls below a predetermined lowest-cell-voltage acceptable value, values for gains in the PI compensation for limiting the supply current are different from values for gains in the PI compensation for restoring the supply current. The system-request current can be securely limited in any operation statuses, and in addition, the supply current can be made rapidly responsive during the limitation of the current, while the supply current can be stably converged during the current restoration. | 09-30-2010 |
20100266916 | FUEL CELL SYSTEM - Provided is a fuel cell system capable of making a shift of an operation state while optically controlling an output voltage and an output voltage of a fuel cell. When an ECU judges that the time when an operation should be shifted from a low-efficiency operation to a normal operation has come, the ECU performs, as preprocessing prior to a shift to a ΔV control, processing of increasing an oxidant gas supplied to a fuel cell stack by a predetermined amount. After this processing, the ECU detects output power, calculates an output power deviation, and then compares the output power deviation with a set deviation threshold. When the output power deviation exceeds the deviation threshold, the ECU carries out the ΔV control, and then carries out an I-V control. Meanwhile, when the output power deviation does not exceed the deviation threshold, the ECU judges that the time when the ΔV control is carried out has not come yet, and automatically starts the I-V control without carrying out the ΔV control. | 10-21-2010 |
20100266922 | FUEL CELL SYSTEM AND MOBILE OBJECT - A fuel cell system capable of improving the voltage controllability of a converter provided in the system is provided. A controller judges whether or not a passing power of a DC/DC converter falls within a reduced response performance area for the number of active phases as of the present moment. When the controller determines that the passing power of the DC/DC converter falls within the reduced response performance area, the controller determines the number of phases which avoids the driving within the reduced response performance area, and outputs a command for switching to the determined number of phases (phase switching command) to the DC/DC converter. | 10-21-2010 |
20100273072 | FUEL CELL SYSTEM - Provided is a fuel cell system that can suitably control a voltage converter in response to a judgment that an abnormal condition occurs in a power detection unit that detects a power passing through the voltage converter. The fuel cell system has: a first power detection unit that estimates an effective value of a converter input power by multiplying the converter input power, which is obtained from a battery voltage and a battery current, by a converter efficiency; a second power detection unit that estimates a converter output power from a fuel cell voltage, a fuel cell current and a driving motor load power; and a third power detection unit that estimates a converter flowing power from a current of a reactor measured by a current sensor (shown in a separate drawing). The fuel cell system also has similar detection units for current, and using one of the detection units or a combination of some of them, specifies a malfunctioning sensor and prohibits correction of parameters. | 10-28-2010 |
20100273075 | FUEL CELL SYSTEM - A fuel cell system capable of carrying out a proper current limiting even when decreasing a cell voltage through, e.g., a rapid warm-up is provided. When a rapid warm-up is started, an acceptable cell-voltage value setting part sets a acceptable lowest-cell-voltage value in accordance with the operation state of a fuel cell. Meanwhile, a target cell-voltage value setting part sets an initial value for a target lowest-cell-voltage value. The target cell-voltage value setting part then compares a lowest cell voltage detected by a cell monitor with the set target lowest-cell-voltage value, and judges whether or not the lowest cell voltage is near the target lowest-cell-voltage value continuously for a given time period. If the result of the judgment is positive, the target cell-voltage value setting part updates the target lowest-cell-voltage value with a value obtained by decreasing the target lowest-cell-voltage value only by an update width. | 10-28-2010 |
20100291447 | FUEL CELL SYSTEM - Provided is a fuel cell system capable of supplying electric power to external loads without excess or deficiency even when switching between operation states is carried out. A warm-up timing judgment part judges whether or not it is time to carry out warm-up based on the temperature of a fuel cell stack. A target shift voltage determination part determines a target output voltage of the fuel cell stack used during a warm-up operation, and a voltage change speed determination part determines a voltage change speed based on electric power required from the fuel cell stack, the target output voltage of the fuel cell stack used during the warm-up operation which is output from the target shift voltage determination part and a current output voltage detected by a voltage sensor. A voltage decrease execution part carries out voltage decrease processing in accordance with the voltage change speed indicated by the voltage change speed determination part. | 11-18-2010 |
20100291452 | FUEL CELL SYSTEM - A fuel cell system increases an output voltage of a fuel cell if an electric power generation command value Pref for the fuel cell abruptly reduces while the fuel cell is being warmed up at a low-efficiency operation, which has lower electric power generation efficiency than that of a normal operation. Thus, the surplus electric power Ws corresponding to the difference between an electric power generation amount Pmes of the fuel cell and the electric power generation command value Pref is stored into a capacitive component of the fuel cell, thereby matching the electric power supplied to an external load of the fuel cell (Pmes-Ws) with the electric power generation command value Pref. This makes it possible to conduct control not to supply the surplus electric power to the external load when the electric power required from the fuel cell suddenly reduces during the low-efficiency operation. | 11-18-2010 |
20110020719 | FUEL CELL SYSTEM AND METHOD OF CONTROLLING THE SAME - A fuel cell system is equipped with a drive motor, a fuel cell, normal electric power generation means for performing normal electric power generation under a condition that the fuel cell is not warmed up, warm-up electric power generation means for performing warm-up electric power generation with lower electric power generation efficiency than normal electric power generation, and warm-up control means for controlling performance of warm-up electric power generation by the warm-up electric power generation means on a basis of a predetermined index on a necessity to warm up the fuel cell. The warm-up control means controls an operation state of the fuel cell during warm-up electric power generation on a basis of a correlation between the system loss required for warm-up of the fuel cell and a warm-up output required for driving of a load including the drive motor during warm-up of the fuel cell. | 01-27-2011 |
20110190959 | FUEL CELL SYSTEM - Even in a case where a rapid variance is demanded as to the input voltage of a converter and the output terminal voltage of a fuel cell, stable converter control is realized. On judging that the change ratio of the demand power of a fuel cell exceeds a set threshold value, a controller executes converter stabilization processing. First, the controller controls a battery converter so that an input voltage of an inverter becomes a set target input voltage. Then, after the input voltage of the inverter reaches the target input voltage, the controller controls an FC converter so that an output terminal voltage of the fuel cell becomes a set target output terminal voltage. | 08-04-2011 |
20110193408 | VEHICLE-MOUNTED MULTI-PHASE CONVERTER AND DESIGN METHOD THEREOF - An object is to miniaturize booster coils used in a vehicle-mounted booster converter. In the design method for a vehicle-mounted multi-phase converter including multiple booster coils and a switching circuit for generating an induced electromotive force at each booster coil by switching of current flowing to each booster coil for applying an output voltage, based on an input voltage and the induced electromotive force generated at each booster coil, to a vehicle drive circuit, a coupling factor indicating the extent by which the induced electromotive force in one of multiple booster coils contributes to the voltage between terminals of another booster coil is determined on the basis of a relationship between the coupling factor and current ripple component of each booster coil. | 08-11-2011 |
20110207011 | FUEL CELL SYSTEM - There is disclosed a fuel cell system capable of stably operating auxiliary devices driven at a high voltage and the like, even in a case where a poisoned electrode catalyst is recovered or a fuel cell is warmed up. On detecting that the electrode catalyst is poisoned, a controller derives a target operation point which is sufficient for recovering an activity of the poisoned electrode catalyst. Then, shift of the operation point from a usual operation point to a low-efficiency operation point is realized so that an output power is held to be constant. | 08-25-2011 |
20110256461 | FUEL CELL SYSTEM, ESTIMATION DEVICE OF AMOUNT OF ANODE GAS TO BE GENERATED AND ESTIMATION METHOD OF AMOUNT OF ANODE GAS TO BE GENERATED - There is disclosed a fuel cell system or the like capable of sufficiently reducing an exhaust hydrogen concentration even in a case where a fuel cell is operated in a state of a low power generation efficiency. A bypass valve B | 10-20-2011 |
20110300461 | FUEL CELL SYSTEM - There is provided a fuel cell system in which a constantly accurate impedance measurement is made possible regardless of a response characteristic of the voltage converting device. A superimposed signal analysis section analyzes an impedance measuring signal after passing through a DC/DC converter to thereby notify a superimposed signal amplitude control section of an analysis result. A superimposed signal amplitude control section controls an amplitude value of the impedance measuring signal generated by a superimposed signal generating section based on the result notified from the superimposed signal analysis section. | 12-08-2011 |
20120019068 | FUEL CELL SYSTEM - The present invention detects a failure in an FC converter. A target voltage determination section determines an output target voltage for a fuel cell. A superimposition signal generation section generates a predetermined reference signal to be superimposed onto the output target voltage. A voltage command signal generation section generates a voltage command signal by superimposing the reference signal onto the output target voltage. A frequency characteristics calculation section calculates the frequency characteristics of the reference signal component superimposed on the output voltage of the fuel cell. A failure judgment section judges that a failure occurs in the FC converter if a value of the calculated frequency characteristics is less than the lower limit threshold value of an allowable range established based on reference characteristics. A gain adjustment section adjusts the gains in the FC converter so that the frequency characteristics calculated by the frequency characteristics calculation section correspond to the reference characteristics. | 01-26-2012 |
20120026757 | CONVERTER CONTROLLER - Provided is a converter controller capable of preventing destruction of an element such as an auxiliary switch by preventing operation interference between auxiliary circuits of respective phases in a multiphase soft switching converter. A duty threshold input unit receives, as an input, an obtained acceptable duty deviation value. A duty deviation computation unit judges whether or not the duty deviation between the phases does not exceed an acceptable duty deviation value. When the duty deviation between the phases exceeds the acceptable duty deviation value, the duty deviation computation unit corrects an adjusted U-phase duty ratio, adjusted V-phase duty ratio and adjusted W-phase duty ratio under the PID control rule, and outputs the resultant duty ratios to an FC converter control circuit. On the other hand, when the duty deviation between the phases does not exceed the acceptable duty deviation value, the duty deviation computation unit does not correct the adjusted U-phase duty ratio, adjusted V-phase duty ratio and adjusted W-phase duty ratio and outputs them to the FC converter control circuit. | 02-02-2012 |
20120098507 | CONVERTER CONTROL DEVICE - Provided is a converter control device which detects an on-failure of an auxiliary switch constituting an auxiliary circuit of a soft switching converter and can prevent element failures. A current sensor for detecting the current flowing in a coil is provided between a fuel cell and the. A controller sequentially detects current by use of the current sensor and makes a judgment as to whether or not the detected has exceeded an overcurrent threshold value stored in a memory (not shown). When the controller judges that the current has exceeded the overcurrent threshold value, the controller judges that a second switching element has an on-failure, and performs a fail-safe operation by stopping the driving of a converter (for example, a U-phase converter) of an auxiliary circuit provided with this second switching element. | 04-26-2012 |
20120106204 | CONVERTER CONTROLLING APPARATUS AND MULTIPHASE CONVERTER - A driving frequency setting portion is provided. The driving frequency setting portion sets a switching frequency of a switching element on the basis of a notification from a driving phase number switching portion. A ripple current detected by a current sensor is in inverse proportion to inductance of reactor. Since a ripple current becomes the largest in the single-phase driving, in this embodiment, considering both the ripple current and switching loss, a switching frequency for the single-phase driving is set higher than a switching frequency for multiphase driving. | 05-03-2012 |
20120139522 | CONVERTER CONTROLLER - There is disclosed a converter controller which can simply and early detect an abnormality of an auxiliary circuit constituting a soft switching converter. On turning off a first switching element, a controller detects a voltage between both the ends of a snubber capacitor and a voltage between both the ends of the first switching element, to obtain a difference voltage. The controller compares the obtained difference voltage with a voltage threshold value stored in a memory (not shown) to judge whether or not the difference voltage is larger than the voltage threshold value. When the difference voltage is smaller than the voltage threshold value, the controller judges that an auxiliary circuit is normal, to end processing, whereas when the difference voltage is not less than the voltage threshold value, the controller judges that a failure (an open failure) occurs in the auxiliary circuit, to shift to a fail safe operation, thereby ending the processing. | 06-07-2012 |
20120225330 | FUEL CELL SYSTEM - When a request power for a fuel cell is smaller than a predetermined value, a fuel cell system stops the supply of an oxidizing gas to the fuel cell and lowers the output voltage of the fuel cell from a use upper limit voltage to a reduction voltage to perform catalyst activation processing. When the output voltage of the fuel cell lowers to an air blow voltage because of the shortage of the oxidizing gas, the fuel cell system resupplies the oxidizing gas to recover the output voltage of the fuel cell. | 09-06-2012 |
20120295174 | FUEL CELL SYSTEM INCLUDING SOFT SWITCHING BOOST CONVERTER - A voltage boost converter includes: a main voltage boost portion that has a first switch and a first coil, and that raises output voltage of a direct-current power source by using counter electromotive force of the coil caused by the switch performing a switching action on the coil; and a subsidiary voltage boost portion which has a capacitor that adjusts potential difference between two poles of the switch by amount of electricity stored, and which reduces switching loss of the switch by adjusting the amount of electricity in the capacitor during the switching action, and which has a second switch and a second coil. The second coil is formed by winding a wire around at least a portion of a core formed of a magnetic body. The core is provided with a gap formed of a non-magnetic body. A core region formed of a magnetic body is adjacent to the gap. | 11-22-2012 |
20120306292 | FUEL CELL SYSTEM - An FC voltage increasing converter includes a plurality of converter parts having reactors. Regarding the first of the plurality of converter parts provided with a thermistor, the output starts to be limited when the temperature detected by the thermistor reaches a limitation starting temperature, which is obtained based on a reference heat-resistant temperature, which is obtained by subtracting an error of the thermistor from a specification heat-resistant temperature of each of the reactors. Meanwhile, regarding the second, third and fourth of the plurality of converter parts not provided with thermistors, the outputs start to be limited when the temperature detected by the thermistor reaches a limitation starting temperature obtained based on an allowable temperature, which is obtained by subtracting a characteristic-variation temperature of the reactor from the reference heat-resistant temperature of the reactor. | 12-06-2012 |
20120326687 | CHOPPER CIRCUIT, DC/DC CONVERTER, AND FUEL CELL SYSTEM - A chopper circuit includes an input unit that inputs a main turn-on signal for turning on a main switching element and an auxiliary turn-on signal for turning on an auxiliary switching element; and a prohibiting unit that prohibits the main switching element from turning on unless the auxiliary turn-on signal is input. | 12-27-2012 |
20130029240 | FUEL CELL SYSTEM AND MOBILE OBJECT - A fuel cell system capable of improving the voltage controllability of a converter provided in the system is provided. A controller judges whether or not a passing power of a DC/DC converter falls within a reduced response performance area for the number of active phases as of the present moment. When the controller determines that the passing power of the DC/DC converter falls within the reduced response performance area, the controller determines the number of phases which avoids the driving within the reduced response performance area, and outputs a command for switching to the determined number of phases (phase switching command) to the DC/DC converter. | 01-31-2013 |
20130045432 | FUEL CELL SYSTEM AND MOBILE OBJECT - A fuel cell system capable of improving the voltage controllability of a converter provided in the system is provided. A controller judges whether or not a passing power of a DC/DC converter falls within a reduced response performance area for the number of active phases as of the present moment. When the controller determines that the passing power of the DC/DC converter falls within the reduced response performance area, the controller determines the number of phases which avoids the driving within the reduced response performance area, and outputs a command for switching to the determined number of phases (phase switching command) to the DC/DC converter. | 02-21-2013 |
20130119968 | DC-DC CONVERTER WITH AN AUXILIARY CIRCUIT FOR PERFORMING SOFT-SWITCHING - A voltage conversion circuit apparatus that adjusts a timing skew between the switching control of the first switching element and the switching control of the second switching element includes: a skew storage portion that stores a timing skew between the switching controls of the first and second switching elements after the voltage conversion circuit apparatus is manufactured; and a timing adjustment portion that corrects the stored timing skew and thereby adjusts the timing relation between a first pulse signal and a second pulse signal so as to bring within a permissible range the timing skew that occurs when the switching controls of the first and second switching elements are performed by using the first pulse signal and the second pulse signal. | 05-16-2013 |
20140072838 | FUEL CELL SYSTEM - The fuel cell system includes: a fuel cell that generates electricity through an electrochemical reaction of fuel gas and oxidation gas; a battery that stores electricity or supplies electricity; and a driving motor that receives electricity for driving. The fuel cell system further includes: a fuel cell electricity supplying path provided between the fuel cell and the driving motor; a battery electricity supplying path extending from the battery and connected to the fuel cell electricity supplying path; and a circuit breaker that is provided closer to the fuel cell than a connecting point of the fuel cell electricity supplying path and the battery electricity supplying path. | 03-13-2014 |
20140145697 | POWER SOURCE SYSTEM - The step-up converter includes the plurality of converting units, each having the reactor and the semiconductor element part having electronic parts such as the transistor and the diodes. The ECU performs changeover control of increase or decrease of the number of drive phases of the converting units, based on the output condition from the fuel cell, the temperature condition of the reactor, and the temperature condition of the semiconductor element part. | 05-29-2014 |
20140152089 | FUEL CELL SYSTEM - In a fuel cell system which includes a high-electricity multiple-phase converter, noise generated due to an increase in reactor vibrations and due to a sound pressure increase caused by a plurality of reactors is effectively inhibited, and silence is improved. A fuel cell system includes a multiple-phase converter provided between a fuel cell and a load device. The fuel cell system includes: selecting means (e.g., a controller) for selecting a driving phase of the multiple-phase converter in accordance with the load of the load device; and driving means (e.g., a controller) for driving a plurality of driving phases, when selected by the selecting means, at carrier frequencies so that these driving phases are nearly opposite to each other. | 06-05-2014 |
20150017485 | FUEL CELL SYSTEM - A fuel cell system comprising a fuel cell and a secondary cell as power supply sources to a load, in which, during normal operation, a first control part allows a first converter (boost converter at the fuel cell side) to control an output voltage of the fuel cell and a second control part allows a second converter (boost converter at the secondary cell side) to control an output voltage to a first load side, whereas during an occurrence of an abnormality of the secondary cell, the first control part allows the first converter to control an output voltage thereof and the second control part allows the second converter to control an output voltage to a second load side. | 01-15-2015 |
20150064589 | FUEL CELL SYSTEM AND ITS CONTROL METHOD - A fuel cell system includes; a fuel cell which generates electricity by using a fuel gas and an oxidant gas as reaction gases; current control means which controls current of a fuel cell; voltage control means which controls voltage of the fuel cell; and heat value control means which calculates a heat value required by the fuel cell system and decides a target current value of the current control means and a target voltage value of the voltage control means so as to generate the calculated necessary heat amount, thereby controlling the heat value. Thus, it is possible to supply a heat required for the fuel cell system without increasing the size of the fuel cell system. | 03-05-2015 |