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    • 5. 发明授权
    • Single phase to three phase power converter for motor loads
    • 用于电机负载的单相到三相功率转换器
    • US5272616A
    • 1993-12-21
    • US871500
    • 1992-04-21
    • Deepakraj M. DivanDonald W. NovotnyChingchi Chen
    • Deepakraj M. DivanDonald W. NovotnyChingchi Chen
    • H02M5/14H02M5/458H02M5/293
    • H02M5/458H02M5/14Y10S323/908
    • An apparatus for converting single phase input power to three phase output power supplied to a motor includes a pair of input lines, and a pair of DC bus lines, a pair of capacitors, a pair of diodes, and a pair of controlled switching devices which are each connected between the DC bus lines. One of the input lines is connected to the node between the capacitors and the other input line is connected to the node between the diodes. Two output lines are connected to the input line and a third output line is connected to the node between the two switching devices, with the three output lines being connected to a motor to supply three phase power to the motor. The switching devices are switched in a pulse width modulated manner to provide a voltage between the third output line and the other two output lines which provides the three phase power. During motor startup, at least one startup capacitor is switched in between one or both of the input lines and the output lines to provide startup torque for the motor. This capacitor is switched out after the motor has been started. A capacitor may also be switched in between the two input lines during startup to reduce the in-rush current on the input lines. Conversion of single phase to three phase power is obtained with only two active switching devices and a simple control strategy.
    • 用于将单相输入功率转换为提供给电动机的三相输出功率的装置包括一对输入线,一对DC总线,一对电容器,一对二极管和一对受控开关装置, 都连接在直流总线之间。 输入线之一连接到电容器之间的节点,另一条输入线连接到二极管之间的节点。 两个输出线连接到输入线,第三输出线连接到两个开关器件之间的节点,三条输出线连接到电动机,以向电动机提供三相电力。 切换装置以脉冲宽度调制方式切换,以在第三输出线和提供三相电源的其它两条输出线之间提供电压。 在电机起动期间,至少有一个起动电容器在一个或两个输入线路和输出线路之间切换,以提供电机的起动转矩。 电机起动后,该电容器被切断。 在启动期间,也可以在两个输入线之间切换电容器以减小输入线上的浪涌电流。 仅使用两个有源开关器件和简单的控制策略可以获得单相到三相功率的转换。
    • 6. 发明授权
    • Battery charging using a transformer with a single primary winding and
plural secondary windings
    • 使用具有单个初级绕组和多个次级绕组的变压器进行电池充电
    • US5659237A
    • 1997-08-19
    • US535964
    • 1995-09-28
    • Deepakraj M. DivanNasser H. KutkutDonald W. NovotnyHerman L. Wiegman
    • Deepakraj M. DivanNasser H. KutkutDonald W. NovotnyHerman L. Wiegman
    • H02J7/00H01M10/44
    • H02J7/0018B60L11/1812B60L11/1816B60L11/1861B60L11/1866B60L2240/547B60L2240/549Y10S320/13Y10S320/29
    • A simple, low-cost technique for charge equalization of a series connected string of battery cells is provided. The secondary windings of a transformer having a single primary winding and multiple secondary windings are connected across each battery cell to be equalized. A single power converter applies a charging signal to the primary of the transformer, inducing a charging current in each secondary which is inversely related to the charge on the battery cells to be equalized. The transformer is preferably implemented as a coaxial winding transformer having low secondary-to-secondary winding coupling. The power converter is preferably implemented as a forward converter supplied with DC power from an adjustable DC power source. A source voltage provided by the DC source may preferably be adjusted during the course of charge equalization to preferentially direct charge to weaker cells. The charge equalization system may be used in combination with a bulk charging system to provide for both rapid charging of a battery string as well as equalization of the battery cells within the string.
    • 提供了一种用于串联连接的电池单元的电荷均衡的简单且低成本的技术。 具有单个初级绕组和多个次级绕组的变压器的次级绕组在每个电池单元之间连接以相等。 单个功率转换器向变压器的初级端施加充电信号,从而引起每个次级的充电电流,其与电池单元上的电荷相反地相等。 变压器优选地实现为具有低次级 - 次级绕组耦合的同轴绕组变压器。 功率转换器优选地实现为从可调直流电源提供DC电力的正激变换器。 由DC电源提供的源电压可以优选地在电荷均衡过程中进行调整,以优先将电荷引导到较弱的电池。 电荷均衡系统可以与批量充电系统组合使用,以提供电池串的快速充电以及串中的电池单元的均衡。
    • 7. 发明授权
    • Single phase to three phase converter capable of variable speed motor
operation
    • 单相至三相转换器,可实现变速电机运行
    • US5402053A
    • 1995-03-28
    • US112609
    • 1993-08-26
    • Deepakraj M. DivanDonald W. NovotnyChingchi Chen
    • Deepakraj M. DivanDonald W. NovotnyChingchi Chen
    • H02M5/14H02M5/293H02M5/458
    • H02M5/458H02M5/14H02M5/293H02P1/265
    • A converter, for providing three phase power to a three phase induction motor from a single phase supply, includes an inverter connected to the single phase input power lines which has two switching devices, and a bi-directional switch connected between one of the single phase input power and one output line to the motor. The other two outputs provided to the motor are a direct connection from the other AC input line and the output of the inverter. In a first or start-up mode of operation, the bi-directional switch and the inverter are controlled to provide currents to the motor which are at a fundamental frequency lower than the single phase AC input frequency to provide controlled start-up of the motor with limited in-rush current. After the motor has started, the converter may be switched to a second mode wherein the bi-directional switch is turned off and the inverter provides single phase power at increasing frequency to the motor to drive the motor up in speed. In a third mode, where the motor is at or near its rated speed, the hi-directional switch and the inverter may be operated to provide power at the rated frequency to the motor, but at variable and controllable voltage levels to control the speed of the motor. In a fourth mode, at or near the rated speed of the motor, the bi-directional switch is controlled to conduct constantly, and the inverter is operated to provide balanced three phase voltages to the motor. The converter may be implemented with only two switching devices in the inverter and one additional bi-directional switch.
    • A转换器,用于从单相电源向三相感应电动机提供三相电力,包括连接到具有两个开关装置的单相输入电力线的逆变器,以及连接在单相之一之间的双向开关 输入电源和一条输出线到电机。 提供给电机的另外两个输出是与另一个交流输入线和逆变器的输出的直接连接。 在第一或启动操作模式下,控制双向开关和逆变器以向基于低于单相交流输入频率的基频提供电动机,以提供电动机的受控起动 具有有限的冲浪电流。 在电动机起动之后,转换器可以切换到第二模式,其中双向开关被关闭,并且逆变器以增加的频率向电动机提供单相功率以驱动电动机的速度。 在第三种模式中,在电动机处于或接近其额定转速的情况下,可以操作高频开关和逆变器以向电动机提供额定频率的功率,但是在可变和可控的电压电平下, 电机。 在第四种模式下,在马达额定转速或接近额定转速的情况下,双向开关被控制为恒定运行,并且逆变器被运行以向马达提供平衡的三相电压。 转换器可以在逆变器中仅使用两个开关器件和一个额外的双向开关来实现。
    • 10. 发明授权
    • Dynamic voltage sag correction
    • 动态电压骤降校正
    • US6118676A
    • 2000-09-12
    • US433993
    • 1999-11-04
    • Deepakraj M. DivanGlen LuckjiffRobert SchneiderWilliam E. BrumsickleWilliam R. Kranz
    • Deepakraj M. DivanGlen LuckjiffRobert SchneiderWilliam E. BrumsickleWilliam R. Kranz
    • H02J3/18H02J3/28H02M5/458H02J3/00G05F1/70
    • H02J3/28H02J3/1814H02M5/458Y02E40/18
    • A low cost, small size, light weight, and highly effective system and method for providing dynamic power line voltage sag correction is provided. A dynamic voltage sag corrector includes a static bypass switch and a regulator/storage module connected together in parallel between input terminals and output terminals. Under normal operating conditions, the static bypass switch is closed, and a normal line voltage level is provided directly from the input terminals to the output terminals via the static bypass switch. When a voltage sag condition is indicated, the static bypass switch is opened, and the regulator/storage module is controlled to provide a near normal output voltage signal to the output terminals. The regulator/storage module includes a power conversion circuit which is controlled to provide the desired output voltage signal by adding a voltage level on storage capacitors to the available input line voltage signal. The components of the dynamic voltage sag corrector are selected to provide voltage sag correction for a duration sufficient to provide correction of 90-95% of voltage sag/drop conditions which are likely to be encountered. The size, cost, and weight of the dynamic voltage sag corrector is thereby reduced. The dynamic voltage sag corrector may also provide surge condition correction, may be configured to provide extended duration voltage sag correction to a priority portion of a load, may provide support to a load even if there is a complete break in an input power line, and may be employed in single or multi-phase applications.
    • 提供了低成本,小尺寸,重量轻和高效的系统和方法来提供动态电力线电压骤降校正。 动态电压骤降校正器包括静态旁路开关和在输入端子和输出端子之间并联连接在一起的调节器/存储模块。 在正常工作条件下,静态旁路开关闭合,通过静态旁路开关直接从输入端子向输出端子提供正常的线路电压电平。 当指示电压下垂条件时,静态旁路开关打开,调节器/存储模块被控制以向输出端提供接近正常的输出电压信号。 调节器/存储模块包括功率转换电路,其被控制以通过将可用输入线路电压信号的存储电容器上的电压电平加上来来提供期望的输出电压信号。 选择动态电压骤降校正器的组件以提供电压骤降校正,持续时间足以提供可能遇到的90-95%的电压骤降/下降条件的校正。 从而减小了动态电压骤降校正器的尺寸,成本和重量。 动态电压暂降校正器还可以提供浪涌状态校正,可以被配置为向负载的优先部分提供延长的持续时间电压骤降校正,即使在输入电力线中存在完全中断,也可以向负载提供支持,以及 可用于单相或多相应用。