公开(公告)号：US5404094A

公开(公告)日：1995-04-04

申请号：US210614

申请日：1994-03-18

申请人： John D. Green ,  John B. Hissong ,  Michael L. Thompson

发明人： John D. Green ,  John B. Hissong ,  Michael L. Thompson

IPC分类号： H02M3/156 ,  G05F1/40

CPC分类号： H02M3/156

摘要： A method and system of converting a wide range of DC input voltages from a DC power source to a substantially lower regulated DC output voltage is disclosed. A pulse width modulated (PWM) signal is generated from an applied DC input voltage to obtain a desired regulated DC output voltage. The PWM signal has a fixed frequency and a variable duty cycle. The PWM signal is filtered to provide a DC output voltage proportional to the amount of time the PWM signal spent in the ON or HIGH state. The duty cycle of the PWM signal is controlled based on an error signal generated by comparing an error voltage level that is proportional to the output voltage to a voltage reference. High voltage protection is provided to the controller during the period the PWM signal is in the OFF or LOW state.

摘要翻译： 公开了一种将直流输入电压从直流电源转换成大幅度下调直流输出电压的方法和系统。 从施加的直流输入电压产生脉宽调制（PWM）信号，以获得所需的稳压直流输出电压。 PWM信号具有固定频率和可变占空比。 PWM信号被滤波以提供与PWM信号在ON或HIGH状态下花费的时间量成比例的DC输出电压。 基于通过将与输出电压成比例的误差电压电平与电压基准进行比较而产生的误差信号来控制PWM信号的占空比。 在PWM信号处于OFF或LOW状态期间，向控制器提供高压保护。

公开(公告)号：US5619077A

公开(公告)日：1997-04-08

申请号：US210882

申请日：1994-03-18

申请人： John D. Green ,  Gregory J. Sheka ,  Michael L. Thompson ,  John B. Hissong ,  Ming D. Tan

发明人： John D. Green ,  Gregory J. Sheka ,  Michael L. Thompson ,  John B. Hissong ,  Ming D. Tan

IPC分类号： H02J9/06 ,  H02J7/00

CPC分类号： H02J9/062 ,  Y10T307/461 ,  Y10T307/615 ,  Y10T307/724

摘要： A system and method for providing an alternate AC voltage to an electrical load having a main AC voltage. The system and method include a signal generator for generating a main AC voltage signal representing the value of the main AC voltage, and a processor for processing the main AC voltage signal to determine a status of the main AC voltage, a main AC voltage failure time period, and a main AC voltage restoration time period. The system and method also include a control signal generator for generating a control signal in response to the main AC voltage signal, the main AC voltage failure time period, the main AC voltage restoration time period, and a pre-selected delay time period, and a switch for switching the electrical load between the main AC voltage and the alternate AC voltage in response to the control signal.

摘要翻译： 一种用于向具有主交流电压的电负载提供交替电压的系统和方法。 该系统和方法包括用于产生表示主交流电压值的主交流电压信号的信号发生器，以及用于处理主交流电压信号以确定主交流电压状态的主处理器，主交流电压故障时间 周期和主交流电压恢复时间段。 该系统和方法还包括一个控制信号发生器，用于响应于主交流电压信号，主交流电压故障时间周期，主交流电压恢复时间周期和预先选择的延迟时间周期产生控制信号，以及 用于响应于控制信号切换主AC电压和交替AC电压之间的电负载的开关。