公开(公告)号：US07219022B2

公开(公告)日：2007-05-15

申请号：US11171789

申请日：2005-06-30

申请人： Shashank S. Wekhande

发明人： Shashank S. Wekhande

IPC分类号： G06F19/00

CPC分类号： G01R19/16552

摘要： Apparatus for detecting failure of an isolation device includes a current sensor to sense current through the isolation device and a circuit responsive to the current sensor output signal and to an enable signal that controls the isolation device for providing an Early Failure Warning (EFW) signal indicative of whether the isolation device has failed. The enable signal is at a first logic level when the isolation device is on and is brought to a second logic level to disable and test the isolation device. Also described is a method of detecting a failure of an isolation device including disabling the isolation device, sensing a current through the isolation device, and providing an EFW signal indicating that the isolation device has failed if the current through the isolation device is greater than a predetermined level when the isolation device is disabled.

摘要翻译： 用于检测隔离装置故障的装置包括用于感测通过隔离装置的电流的电流传感器和响应于当前传感器输出信号的电路和控制隔离装置的使能信号，以提供指示性的早期故障警告（EFW）信号 隔离设备是否失败。 当隔离设备接通并使其达到第二逻辑电平以禁用和测试隔离设备时，使能信号处于第一逻辑电平。 还描述了一种检测隔离装置的故障的方法，包括禁用隔离装置，感测通过隔离装置的电流，以及提供EFW信号，指示隔离装置如果通过隔离装置的电流大于 禁用隔离设备时的预定电平。

公开(公告)号：US07646616B2

公开(公告)日：2010-01-12

申请号：US11125300

申请日：2005-05-09

申请人： Shashank S. Wekhande ,  Vijay R. Mangtani ,  Sihua Wen

发明人： Shashank S. Wekhande ,  Vijay R. Mangtani ,  Sihua Wen

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A capacitor charging circuit is provided with a primary side output voltage sensing circuit for generating a control signal indicative of whether the output voltage has reached a desired level. The control signal is unaffected by voltage spikes occurring when the main switch is turned off. In one embodiment, the circuit filters the primary side voltage for comparison to a reference voltage in order to provide the control signal. In another embodiment, an AND gate provides the control signal indicating that the output voltage has reached the desired level only in response to the primary side voltage being greater than a reference voltage and the secondary current being discontinuous. In a further embodiment, an AND gate provides the control signal indicating that the output voltage has reached the desired levels only in response to a predetermined delay occurring after the primary side voltage becomes greater than a reference voltage and the secondary current being discontinuous. According to a further aspect of the invention, an auxiliary switch is provided to reduce the reverse recovery time of the output diode in order to speed up the capacitor charging time.

摘要翻译： 电容器充电电路设置有初级侧输出电压检测电路，用于产生指示输出电压是否达到期望电平的控制信号。 当主开关关闭时，控制信号不受电压尖峰的影响。 在一个实施例中，为了提供控制信号，该电路对初级侧电压进行滤波以与参考电压进行比较。 在另一个实施例中，与门提供控制信号，指示输出电压仅在响应于初级侧电压大于参考电压并且次级电流不连续时才达到期望电平。 在另一个实施例中，与门提供控制信号，指示输出电压仅在响应于在初级侧电压变得大于参考电压并且次级电流不连续之后发生的预定延迟时才达到期望电平。 根据本发明的另一方面，提供辅助开关以减小输出二极管的反向恢复时间，以加速电容器充电时间。

公开(公告)号：US06646895B1

公开(公告)日：2003-11-11

申请号：US10057326

申请日：2001-10-25

申请人： Mark E. Jacobs ,  Robert J. Murphy, Jr. ,  Ramanujam Ramabhadran ,  Thomas G. Wang ,  Shashank S. Wekhande

发明人： Mark E. Jacobs ,  Robert J. Murphy, Jr. ,  Ramanujam Ramabhadran ,  Thomas G. Wang ,  Shashank S. Wekhande

IPC分类号： H02M3335

CPC分类号： H02M3/33561 ,  H02M3/33569 ,  H02M2001/0006

摘要： A bias supply circuit and a method of operating a bias supply circuit for use with a switching power supply employing a main switch and an auxiliary switch and having an input voltage and a voltage across a clamp capacitor coupled to a transformer. In one embodiment, the bias supply circuit includes a bias supply winding associated with the transformer and configured to provide a first voltage dependent on at least one of the input voltage and the voltage across the clamp capacitor during a conduction period of the main switch or the auxiliary switch. Additionally, the bias supply circuit further includes a bias supply storage capacitor coupled to the bias supply winding and configured to provide a second voltage dependent on at least another of the input voltage and the voltage across the clamp capacitor during a conduction period of another of the main switch or the auxiliary switch. A sum of the first voltage and the second voltage provides a bias supply voltage.

摘要翻译： 一种偏置电源电路和一种用于与采用主开关和辅助开关的开关电源一起使用并具有耦合到变压器的钳位电容器两端的输入电压和电压的偏置电源电路的方法。 在一个实施例中，偏置电源电路包括与变压器相关联的偏置电源绕组，并且被配置为在主开关的导通时段期间提供取决于钳位电容器两端的输入电压和电压中的至少一个的第一电压， 辅助开关 此外，偏置电源电路还包括耦合到偏置电源绕组的偏置电源存储电容器，并且被配置为在另一个的另一个的导通周期期间提供取决于钳位电容器两端的输入电压和电压中的至少另一个的第二电压 主开关或辅助开关。 第一电压和第二电压的总和提供偏置电源电压。