-
1.发明申请公开(公告)号：US20200249281A1
公开(公告)日：2020-08-06
申请号：US16711504
申请日：2019-12-12
Applicant: FUJITSU LIMITED
Inventor： Masatoshi Ishii , YOSHIYASU NAKASHIMA
IPC: G01R31/392 , G01R31/367 , G01R31/389
Abstract: An information processing apparatus includes: a memory; and a processor coupled to the memory and configured to: obtain an actual measurement voltage at a time of a voltage change of a battery; estimate an internal impedance of the battery based on an equivalent circuit model of the battery in which a Warburg impedance is represented by an approximate equation using an equivalent circuit which is a series circuit of CR circuits and has steps of a power of 10 as a time constant of the CR circuit and the actual measurement voltage; determine a deterioration state of the battery based on the internal impedance; and notify of deterioration of the battery in a case where the deterioration diagnosis unit detects deterioration.
-
公开(公告)号：US20140153288A1
公开(公告)日：2014-06-05
申请号：US14177269
申请日：2014-02-11
Applicant: FUJITSU LIMITED
Inventor： Yu Yonezawa , YOSHIYASU NAKASHIMA
IPC: H02M3/335
CPC classification number: H02M3/33507 , H02M3/33569 , H02M2001/0058 , Y02B70/1433 , Y02B70/1491
Abstract: A DC-DC converter includes a capacitor configured to be charged for a predetermined period by an external voltage, an inductor configured to constitute an LC resonance circuit together with the capacitor, a closed-loop current path configured to release energy accumulated in the capacitor after the predetermined period to cause a current flowing in the LC resonance circuit to oscillate, a transformer configured to receive a current flowing in the closed-loop current path, and a rectifying circuit situated on an output side of the transformer.
Abstract translation: DC-DC转换器包括被配置为通过外部电压被充电预定周期的电容器，被配置为与电容器一起构成LC谐振电路的电感器;闭环电流通路，被配置为释放在电容器之后累积的能量 在LC谐振电路中流动的电流发生振荡的预定周期，配置成接收在闭环电流通路中流动的电流的变压器以及位于变压器的输出侧的整流电路。
-
公开(公告)号：US20190155347A1
公开(公告)日：2019-05-23
申请号：US16158357
申请日：2018-10-12
Applicant: FUJITSU LIMITED
Inventor： Masatoshi Ishii , YOSHIYASU NAKASHIMA
Abstract: A portable electronic device has a control unit including a processor whose clock frequency is variable, a temperature sensor, a housing that encases the control unit and temperature sensor, and a touch sensor that is able to detect touching to the surface of the housing. The control unit obtains a measured value of temperature from the temperature sensor, calculates an estimated value of surface temperature of the housing using the measured value and a first heat transfer model when the touch sensor has not detected touching, calculates the estimated value using the measured value and a second heat transfer model when the touch sensor has detected touching, decreases an upper limit for the clock frequency when the estimated value is higher than or equal to a threshold, and increases the upper limit for the clock frequency when the estimated value is lower than the threshold.
-
公开(公告)号：US20190097525A1
公开(公告)日：2019-03-28
申请号：US16137597
申请日：2018-09-21
Applicant: FUJITSU LIMITED
Inventor： Hiroshi Nakao , Yu Yonezawa , YOSHIYASU NAKASHIMA
Abstract: A power-supply apparatus includes a power-supply circuit to which an input voltage and an input current are input, to include a switching element to be controlled by a control signal so as to generate an output voltage and an output current, a memory, and a processor coupled to the memory and the processor to calculate a first duty ratio of the control signal so that the output voltage approaches a target voltage, calculate a second duty ratio of the control signal for the switching element, based on the input voltage, the input current, the output voltage, and the output current, detect deterioration of the power-supply circuit, based on the first duty ratio and the second duty ratio, generate the control signal of the first duty ratio when the power-supply circuit has not deteriorated, and generate the control signal for stopping the power-supply circuit when the power-supply circuit has deteriorated.
-
公开(公告)号：US20170126135A1
公开(公告)日：2017-05-04
申请号：US15295384
申请日：2016-10-17
Applicant: FUJITSU LIMITED
Inventor： Takahiko SUGAWARA , Yu Yonezawa , Hiroshi Nakao , YOSHIYASU NAKASHIMA
CPC classification number: H02M3/33507 , H02M1/08 , H02M1/36 , H02M2001/0009
Abstract: A power supply device includes: a memory; and a processor coupled to the memory and the processor configured to: determine a duty ratio of a control signal of a switching element in a power supply circuit so that an output voltage of the power supply circuit approaches a target voltage; compute an acceptable range of a duty ratio based on an output current of the power supply circuit detected by a current detecting circuit; output the duty ratio when the duty ratio is inside the acceptable range; and stop the power supply circuit when the duty ratio is outside the acceptable range.
-
Patent Agency Ranking
公开(公告)号：US20170201184A1
公开(公告)日：2017-07-13
申请号：US15372990
申请日：2016-12-08
Applicant: FUJITSU LIMITED
Inventor： Yu Yonezawa , Takahiko SUGAWARA , YOSHIYASU NAKASHIMA
CPC classification number: H02M3/33546 , H02M1/32 , H02M3/33553 , H02M2001/0025
Abstract: A power supply apparatus includes a trans circuit configured to convert an input voltage into an output voltage by adjusting switching of the input voltage; an output voltage detector configured to detect the output voltage; a compensator configured to generate a control value controlling a duty ratio of the switching such that a value of the detected output voltage coincides with a target value for the output voltage; an input voltage detector configured to detect the input voltage; an estimator configured to estimate an allowed range of the control value in accordance with the target value and a value of the detected input voltage; and an adjuster configured to adjust the control value so as to stop the switching when the control value falls outside the allowed range.
-
公开(公告)号：US20150188534A1
公开(公告)日：2015-07-02
申请号：US14556597
申请日：2014-12-01
Applicant: FUJITSU LIMITED
Inventor： Yu Yonezawa , YOSHIYASU NAKASHIMA
IPC: H03K17/16
CPC classification number: H03K17/165 , H03K17/04163
Abstract: A semiconductor device includes: a first field-effect transistor configured to have a source connected to a reference potential node; a second field-effect transistor configured to have a source connected to a drain of the first field-effect transistor, and a gate connected to the source of the first field-effect transistor; a gate signal node configured to input a gate signal therein; a first resistor configured to be connected between the gate signal node and a gate of the first field-effect transistor; and a first capacitor and a switch circuit configured to be connected between a drain of the second field-effect transistor and the gate of the first field-effect transistor, in which the switch circuit is connected in series with the first capacitor.
Abstract translation: 半导体器件包括：第一场效应晶体管，被配置为具有连接到参考电位节点的源极; 第二场效应晶体管，其被配置为具有连接到所述第一场效应晶体管的漏极的源极和连接到所述第一场效应晶体管的源极的栅极; 门信号节点，被配置为在其中输入门信号; 第一电阻器，被配置为连接在所述栅极信号节点和所述第一场效应晶体管的栅极之间; 以及第一电容器和开关电路，其被配置为连接在第二场效应晶体管的漏极和第一场效应晶体管的栅极之间，其中开关电路与第一电容器串联连接。
-
公开(公告)号：US20150138851A1
公开(公告)日：2015-05-21
申请号：US14532091
申请日：2014-11-04
Applicant: FUJITSU LIMITED
Inventor： Yu Yonezawa , Tomotake Sasaki , Yoshinobu Matsui , YOSHIYASU NAKASHIMA
CPC classification number: H02M3/33523 , H02M1/4225 , H02M2001/0025 , Y02B70/126 , Y02P80/112
Abstract: A PFC circuit generates substantially sinusoidal current that is in-phase with AC input voltage to compensate for a power factor. A DC-DC converter converts the voltage of a signal outputted from the PFC circuit to determined voltage. A current change detection section detects an amount of change in current outputted from the DC-DC converter, compares the detected amount of change in current with a threshold set in advance, and if the detected amount of change in current is larger than the threshold, outputs a gain switching signal for raising the gain of voltage outputted from the PFC circuit. The current change detection section outputs a voltage control signal for raising the voltage outputted from the PFC circuit to a determined value. A voltage setting section sets the voltage outputted from the PFC circuit to the determined value on the basis of the voltage control signal.
Abstract translation: PFC电路产生与AC输入电压同相的基本正弦电流，以补偿功率因数。 DC-DC转换器将从PFC电路输出的信号的电压转换为确定的电压。 电流变化检测部分检测从DC-DC转换器输出的电流变化量，将检测到的电流变化量与预先设定的阈值进行比较，并且如果检测到的电流变化量大于阈值， 输出用于提高从PFC电路输出的电压的增益的增益切换信号。 电流变化检测部分输出用于将从PFC电路输出的电压升高到确定值的电压控制信号。 电压设定部根据电压控制信号，将从PFC电路输出的电压设定为确定值。
-
公开(公告)号：US20200184033A1
公开(公告)日：2020-06-11
申请号：US16674787
申请日：2019-11-05
Applicant: FUJITSU LIMITED
Inventor： Yu Yonezawa , YOSHIYASU NAKASHIMA
Abstract: A simulation apparatus of a power supply circuit includes an input processing circuit configured to process a pulse signal output from a control device that controls the power supply circuit, a memory, a processor coupled to the memory and configured to derive a response signal with respect to the pulse signal processed by the input processing circuit, by a calculation using a plurality of transfer functions that represents characteristics of the power supply circuit, and process the response signal to transmit to a device that displays the response signal, and an output processing circuit configured to process the response signal to transmit to the control device.
-
公开(公告)号：US20170292984A1
公开(公告)日：2017-10-12
申请号：US15455179
申请日：2017-03-10
Applicant: FUJITSU LIMITED
Inventor： Hiroshi Nakao , Yu Yonezawa , Takahiko SUGAWARA , YOSHIYASU NAKASHIMA
Abstract: A capacitor life diagnosis apparatus includes ringing detection circuitry that detects ringing of an output voltage of a power source including a capacitor at an output end, and signal generation circuitry that generates a signal indicating a life of the capacitor based on the ringing detected by the ringing detection circuitry.
-
-
-
-
-
-
-
-
-
Search Results
18
records
(took 0.013 seconds)
