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    • 2. 发明授权
    • Back-up uninterruptible power system
    • 备用不间断电源系统
    • US5315533A
    • 1994-05-24
    • US702733
    • 1991-05-17
    • Frederick A. StichDonald K. Zahrte, Sr.Richard V. Baxter, Jr.Douglas C. FoltsThomas G. HubertJuan M. MedinaWilliam J. HazenEdward G. Beistle
    • Frederick A. StichDonald K. Zahrte, Sr.Richard V. Baxter, Jr.Douglas C. FoltsThomas G. HubertJuan M. MedinaWilliam J. HazenEdward G. Beistle
    • G06F1/26H02J9/06G06F15/20
    • H02J9/062Y10T307/625
    • A back-up uninterruptible power system has a power supply path from input terminals connected to AC power system lines to normally supply power to a load. Upon the occurrence of a line fault, a static switch in the power supply path interrupts the connection between the AC power lines and the load and an inverter is turned on to provide power derived from an auxiliary battery through a transformer to the power supply path to supply AC power to the load. By using the static switch, switching from line connection to backup power can be done quickly, within a half cycle, so that substantially no interruption of the output waveform is observed. The inverter can be operated to provide a commutation pulse to the SCRs in the static switch to commutate an SCR which might otherwise continue conducting after the triggering signals to the gates are cut off and before the inverter supplies the AC power to the load. A relay connected between the input terminals and the static switch is controlled to open relay contacts after the static switch has interrupted the current flow to the load, thereby providing positive electrical isolation of the AC power system from the uninterruptible power system while allowing the mechanical relay contacts to switch only during times of no current. Line fault detection is carried out by creating a digital waveform composed of an average of prior cycles of the AC input waveform, converting the stored waveform to an analog signal, and comparing it with the present input signal in phase lock therewith to detect deviation of the input signal from the reference waveform.
    • 备用的不间断电力系统具有从连接到AC电力系统线路的输入端子的电源路径,以正常地向负载供电。 在发生线路故障时,电源路径中的静态开关中断交流电力线与负载之间的连接,并且逆变器接通,以通过变压器提供从辅助电池获得的功率到电源路径 为负载提供交流电源。 通过使用静态开关,可以在半个周期内快速地进行从线路连接切换到备用电源,从而观察到输出波形基本上不会中断。 可以对逆变器进行操作,以向静态开关中的SCR提供换向脉冲,以便在切断对门的触发信号之后以及在逆变器将AC电力提供给负载之前换向可能继续导通的SCR。 连接在输入端子和静态开关之间的继电器被控制以在静态开关中断到电流到负载的电流之后打开继电器触点,从而提供交流电力系统与不间断电力系统的正电隔离,同时允许机械继电器 触点仅在无电流时才切换。 线路故障检测通过产生由AC输入波形的先前周期的平均值组成的数字波形,将存储的波形转换成模拟信号,并将其与当前输入信号进行相位锁定,以检测其中的偏差 来自参考波形的输入信号。
    • 6. 发明授权
    • Method and apparatus for determination of battery run-time in
uninterruptible power system
    • 用于确定不间断电源系统中电池运行时间的方法和装置
    • US5295078A
    • 1994-03-15
    • US883501
    • 1992-05-15
    • Frederick A. StichEdward G. Beistle
    • Frederick A. StichEdward G. Beistle
    • G06F1/26H02J9/06G06F15/20
    • H02J9/062Y10T307/625
    • The run-time on battery power available from an uninterruptible power system is accurately determined both during supply of power from the battery through an inverter to the load and during the time where power is supplied directly from an AC power system to the load. During power outages where power is supplied from the battery through the inverter to the load, the output voltage of the battery is directly measured as is the output current supplied to the load. The remaining run-time is determined utilizing the measured battery voltage, the measured output current, and system specifications including the full charge open circuit voltage of the battery, the allowable lower limit of battery voltage, and constants which are characteristic of the uninterruptible power supply and the battery. When power is supplied from the AC power system to the load, the open circuit voltage of the battery is measured initially, and then during the time that the battery is being recharged the open circuit battery voltage is calculated based on the initial open circuit voltage adjusted by a factor porportional to the time that the battery has been charged. The calculated open circuit voltage is used to calculate a battery voltage under load conditions by subtracting a term proportional to output current. These estimates are then utilized to calculate run-time in a manner similar to that used to calculate run-time when the battery is loaded. Thus, the inverter need not be turned on to supply power to the load solely for the purpose of testing the battery.
    • 在从电池通过逆变器向负载供电并且在从AC电力系统直接供电到负载的时间期间,可以准确地确定来自不间断电力系统的可用电池电量的运行时间。 在从电池通过变频器向负载供电的停电期间,直接测量电池的输出电压,并将其提供给负载的输出电流。 剩余的运行时间是利用测量的电池电压,测量的输出电流以及系统规格来确定的,包括电池的全充电开路电压,电池电压的允许下限以及不间断电源的特性的常数 和电池。 当从交流电源系统向负载供电时,初始测量电池的开路电压,然后在电池再充电时,开路电池电压根据初始开路电压调整 通过与电池充电时间的比例。 计算的开路电压用于通过减去与输出电流成比例的项来计算负载条件下的电池电压。 然后利用这些估计来计算运行时间,其方式类似于当加载电池时计算运行时间的运行时间。 因此,为了测试电池的目的,逆变器不需要接通以为负载供电。