Switched mode converter and methods of controlling switched mode converters
    8.
    发明授权
    Switched mode converter and methods of controlling switched mode converters 有权
    开关模式转换器和控制开关模式转换器的方法

    公开(公告)号:US09263955B2

    公开(公告)日:2016-02-16

    申请号:US14342724

    申请日:2012-09-03

    摘要: A method is disclosed of controlling a switched mode converter comprising a switch and for providing power to device having a load, comprising: in response to the load exceeding a first threshold, operating in a first mode, being a CCM; in response to the load exceeding a second threshold and not exceeding the first threshold, operating in second mode, being a BCM without valley skipping wherein the switching frequency increases with decreasing load; in response to the load exceeding a third threshold and not exceeding the second threshold, operating in a third mode, being a BCM with valley skipping, wherein the switching frequency depends on the load and the number of valleys skipped and is between a fixed upper and a lower switching frequency limit; and in response to the load not exceeding the third threshold, operating in a fourth mode, being a BCM with valley skipping, wherein the switching frequency depends on at least the load, and is between an upper and a lower switching frequency limit wherein the upper switching frequency limit decreases with decreasing load. A switched mode converter controlled by such a method is also disclosed.

    摘要翻译: 公开了一种控制包括开关并用于向具有负载的装置提供电力的开关模式转换器的方法,包括:响应于所述负载超过第一阈值,以第一模式操作,为CCM; 响应于所述负载超过第二阈值且不超过所述第一阈值,在第二模式下操作,所述BCM不具有谷跳跃,其中所述开关频率随负载减小而增加; 响应于超过第三阈值并且不超过第二阈值的负载,以第三模式操作,作为具有谷跳跃的BCM,其中开关频率取决于跳过的负载和谷数,并且在固定的上限和 低开关频率限制; 并且响应于不超过第三阈值的负载,以第四模式操作,作为具有谷跳跃的BCM,其中开关频率至少取决于负载,并且处于上和下开关频率极限之间,其中上部 开关频率限制随负载减小而减小。 还公开了通过这种方法控制的开关模式转换器。

    Power factor correction (PFC) circuit and method therefor
    10.
    发明授权
    Power factor correction (PFC) circuit and method therefor 有权
    功率因数校正(PFC)电路及其方法

    公开(公告)号:US08441237B2

    公开(公告)日:2013-05-14

    申请号:US12981142

    申请日:2010-12-29

    IPC分类号: G05F1/652 G05F1/656

    CPC分类号: H02M1/4208 Y02B70/126

    摘要: Consistent with an example embodiment, a circuit comprises a power factor correction stage having a DC input, a ground input, a DC output and a ground output. The circuit further includes a capacitor; a diode; and a discharge circuit. A first terminal of the diode is connected to an input of the power factor correction stage, a second terminal of the diode is connected to the first plate of the capacitor; and the second plate of the capacitor is connected to the other input of the PFC stage. The discharge circuit is connected to the capacitor and is configured to discharge the capacitor such that it contributes to the output of the PFC stage when the level of a signal at the input of the PFC stage falls below a threshold value.

    摘要翻译: 与示例实施例一致,电路包括具有DC输入,接地输入,DC输出和接地输出的功率因数校正级。 电路还包括电容器; 二极管 和放电电路。 二极管的第一端子连接到功率因数校正级的输入端,二极管的第二端子连接到电容器的第一板; 并且电容器的第二板连接到PFC级的另一个输入端。 放电电路连接到电容器,并且被配置为放电电容器,使得当PFC级的输入端的信号电平低于阈值时,它有助于PFC级的输出。