Patent application number | Description | Published |
20120088172 | FUEL CELL SYSTEM - The power generation efficiency of a fuel cell system is improved. A fuel cell and an FC converter are integrally assembled so as to allow heat transfer therebetween, and are contained in the same casing. A control unit shifts a switching mode of a boost switch included in the FC converter from a soft switching mode to a hard switching mode when a temperature of the fuel cell is lower than a lower limit value of an allowable temperature range in accordance with an output of the fuel cell. | 04-12-2012 |
20130176759 | FUEL CELL SYSTEM - A fuel cell system includes: a converter disposed between a fuel cell and a load to increase an output voltage of the fuel cell; and a control unit that controls the converter at a predetermined duty ratio, wherein the control unit determines a duty command value for the converter from a feed-forward duty and a feed-back duty which are calculated using a command value of a reactor current that flows through a reactor in the converter and/or using a measurement value of the reactor current. In a low-load operation, the control unit sets, as a measurement value of the reactor current, a value obtained by multiplying a midpoint measurement value measured at an intermediate time of an on-duty period by a predetermined coefficient. | 07-11-2013 |
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 |
20160132035 | FUEL CELL SYSTEM AND METHOD OF CONTROLLING FUEL CELL - A fuel cell system in which power generation is performed by a fuel cell, comprising: a power generation controller that performs: first control in which at least one of power control for preventing generated power from exceeding an upper limit value, voltage control for preventing generated voltage from falling below a lower limit value and current control for preventing generated current from exceeding an upper limit value is performed and second control in which the generated voltage is prevented from exceeding an upper limit value; and a priority instructor that instructs the power generation controller to prioritize the first control over the second control when the first control and the second control collide with each other. | 05-12-2016 |
20160141667 | FUEL CELL SYSTEM AND OPERATION CONTROL METHOD OF THE SAME - The present invention enables the determination of an operating point of a fuel cell so as to prioritize the fulfillment of an amount of required power generation while avoiding various limitations, such as a current limit, in a fuel cell system that warms up the fuel cell by a low efficiency operation. | 05-19-2016 |
20160141675 | FUEL CELL SYSTEM AND OPERATION CONTROL METHOD OF THE SAME - 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. | 05-19-2016 |
20160141689 | FUEL CELL SYSTEM AND FUEL CELL CONTROL METHOD - A fuel cell system comprising: a power generation controller that controls a value subject to control, which is a value exhibiting a power generating state by a fuel cell and is a value that is affected by alternating current applied to the fuel cell, to approach a target value; a dead zone setter that sets a dead zone with the target value as a reference; and, a stopper that stops the control by the power generation controller when the value subject to control is contained in the dead zone. | 05-19-2016 |