公开(公告)号：US20110090720A1

公开(公告)日：2011-04-21

申请号：US12904317

申请日：2010-10-14

申请人： Kansuke FUJII

发明人： Kansuke FUJII

IPC分类号： H02M1/36

CPC分类号： H02M1/36 ,  H02M7/493

摘要： In a unit inverter system where multiple unit inverters are connected in parallel, the quantity of operating unit inverters is determined in accordance with an amount of power to be converted. A gate signal of a semiconductor switching element of a unit inverter is turned off after an output current of the inverter is reduced when reducing the quantity of inverter units, thereby improving the partial load efficiency of the system without an adverse effect on the system. A regulator connected to the inverter determines dead time of the inverter according to the output current value and an average output current value of the unit inverters, waits for the determined dead time so as to reduce the output current of the unit inverter, and then turns off the gate signal.

摘要翻译： 在并联连接多个单元逆变器的单元逆变器系统中，根据要转换的功率量来确定操作单元逆变器的数量。 当减少逆变器单元的数量时，在逆变器的输出电流减小之后，单位逆变器的半导体开关元件的栅极信号被关断，从而提高系统的部分负载效率，而不会对系统产生不利影响。 与变频器连接的调节器根据输出电流值和单位逆变器的平均输出电流值确定变频器的死区时间，等待确定的死区时间，以降低单元逆变器的输出电流，然后转向 关门信号。

公开(公告)号：US20120262957A1

公开(公告)日：2012-10-18

申请号：US13271141

申请日：2011-10-11

申请人： Toshiya YAMADA ,  Kansuke FUJII ,  Kazuyoshi UMEZAWA ,  Masaki KATOH ,  Motohiro KATAYAMA

发明人： Toshiya YAMADA ,  Kansuke FUJII ,  Kazuyoshi UMEZAWA ,  Masaki KATOH ,  Motohiro KATAYAMA

IPC分类号： H02M1/12

CPC分类号： H02J3/01 ,  H02J3/383 ,  H02J3/386 ,  Y02E10/563 ,  Y02E10/763 ,  Y02E40/40

摘要： A distributed power supply system in which no simultaneous disconnection from the system occurs when a system voltage momentarily drops is provided. It includes an inverter circuit that converts a direct current power generated by a direct current power supply and that supplies the alternating current power to an alternating current power supply power system, and an inverter control circuit for carrying out PWM control of the inverter circuit, wherein the inverter control circuit includes a three-phase voltage command signal generation unit, that is configured of a three-phase fundamental wave signal generation unit that generates three-phase fundamental wave signals from two phase components of voltage detected by a voltage detector, and a third harmonic signal generation unit that adds together third harmonic components of respective phases, having a predetermined amplitude, generated based on the three-phase fundamental wave signals.

摘要翻译： 一种分布式供电系统，其中当系统电压瞬时下降时，不发生同时断开系统。 它包括一个逆变器电路，其将由直流电源产生的直流电力转换并将交流电力提供给交流电源电力系统;以及逆变器控制电路，用于执行逆变器电路的PWM控制，其中 逆变器控制电路包括三相电压指令信号生成单元，该三相电压指令信号生成单元由三相基本信号生成单元构成，该三相基本信号生成单元从由电压检测器检测的电压的两相分量生成三相基波信号， 三次谐波信号生成单元，其将具有预定幅度的各相的三次谐波分量相加，基于三相基本信号产生。

公开(公告)号：US20120319664A1

公开(公告)日：2012-12-20

申请号：US13525264

申请日：2012-06-15

申请人： Kansuke FUJII

发明人： Kansuke FUJII

IPC分类号： G05F1/618

CPC分类号： H02M3/1588 ,  H02J7/345 ,  H02M2001/0077 ,  Y02B40/90 ,  Y02B70/1466

摘要： A DC power supply system delivers DC output having a neutral point and higher than the input voltage of a single DC power supply by a circuit with series-connected switching elements. The DC power supply system addresses the problem of imbalance between the voltage between a positive terminal and the neutral point and the voltage between a negative terminal and the neutral point. In operational control of the DC power supply system, a capacitor voltage between the neutral point and the positive terminal and a capacitor voltage between the neutral point and the negative terminal are compared, and four switching elements are operated to equalize the two capacitor voltages.

摘要翻译： 直流电源系统通过具有串联开关元件的电路提供具有中性点并高于单个DC电源的输入电压的DC输出。 直流电源系统解决了正极和中性点之间的电压与负极和中性点之间的电压之间的不平衡问题。 在直流电源系统的运行控制中，比较中性点和正极端子之间的电容电压以及中性点和负极端子之间的电容电压，并且操作四个开关元件以均衡两个电容器电压。

公开(公告)号：US20110249475A1

公开(公告)日：2011-10-13

申请号：US13084528

申请日：2011-04-11

申请人： Kansuke FUJII ,  Toshiya Yamada ,  Masaki Katoh

发明人： Kansuke FUJII ,  Toshiya Yamada ,  Masaki Katoh

IPC分类号： H02H7/122

CPC分类号： H02H7/122 ,  H02J3/383 ,  H02M1/32 ,  H02M7/48 ,  H02M2001/322 ,  Y02E10/563

摘要： A grid-connected inverter includes first and second power conversion circuits, a contactor and a control circuit. The first conversion circuit converts a first DC voltage to a second DC voltage. The second conversion circuit converts the second DC voltage to an AC voltage. The contactor connects an output side of the second conversion circuit to a power system. The control circuit includes a decision circuit and controls start and stop operations of the conversion circuits, and opening and closing of the contactor. The decision circuit decides whether a condition of the contactor is abnormal by detecting, after the control circuit controls the contactor to be open, whether or not a value of the second DC voltage is less than a threshold value, and if the value of the second DC voltage is detected to be not less than the threshold value, decides that the condition of the contactor is abnormal.

摘要翻译： 并网逆变器包括第一和第二功率转换电路，接触器和控制电路。 第一转换电路将第一直流电压转换为第二直流电压。 第二转换电路将第二直流电压转换为交流电压。 接触器将第二转换电路的输出侧连接到电力系统。 控制电路包括判定电路，并控制转换电路的启动和停止操作以及接触器的打开和关闭。 决定电路通过在控制电路控制接触器打开之后检测第二直流电压的值是否小于阈值来判定接触器的状况是否异常，并且如果第二 检测到直流电压不小于阈值，判定接触器的状态异常。