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1. 发明申请

WO2007130533A2 METHOD AND APPARATUS FOR IMPROVING LIGHT LOAD EFFICIENCY IN SWITCHING POWER SUPPLIES 审中-公开
标题翻译：改善开关电源轻负载效率的方法和装置
公开(公告)号：WO2007130533A2
公开(公告)日：2007-11-15
申请号：PCT/US2007/010761
申请日：2007-05-03
申请人： INTERNATIONAL RECTIFIER CORPORATION , CHEN, Rengang , BROWN, James Steven
发明人： CHEN, Rengang , BROWN, James Steven
IPC分类号： H02M3/335
CPC分类号： H02M3/156 , H02M2001/0032 , Y02B70/16
摘要： A circuit for transitioning between a discontinuous and a fixed frequency continuous conduction mode (DCM) and (CCM) of a power converter having a driver receiving PWM signals and controlling a switching stage comprises a control switch and a sync switch connected at a common switching node for driving a load. The circuit including a PWM modulator for providing PWM signals; and a mode selector for receiving a duty cycle value, a preset switching period, and a duty cycle at a critical conduction point having a switching frequency equal to the preset switching period and providing an on-time of the control switch and a switching period to the PWM modulator, wherein if the duty cycle value is greater than the duty cycle at a critical conduction point, the PWM modulator will drive will provide the PWM signals to operate the switching stage in the CCM with constant-frequency duty cycle control, and if the duty cycle value is less than duty cycle at a critical conduction point, the PWM modulator will drive will provide the PWM signals to operate the switching stage in the DCM by turning off the sync switch when a load current becomes negative.
摘要翻译：用于在具有接收PWM信号并控制切换级的驱动器的功率转换器的不连续和固定频率连续传导模式（DCM）和（CCM）之间转换的电路包括控制开关和连接在公共交换节点用于驱动负载。该电路包括用于提供PWM信号的PWM调制器; 以及模式选择器，用于在具有等于预设开关周期的开关频率的临界导通点处接收占空比值，预设开关周期和占空比，并且提供控制开关的导通时间和开关周期 PWM调制器，其中如果占空比值大于在临界导通点处的占空比，则PWM调制器将驱动将提供PWM信号以恒定频率占空比控制在CCM中操作开关级，并且如果占空比值小于临界导通点的占空比，当负载电流变为负时，PWM调制器将驱动通过关闭同步开关来提供PWM信号来操作DCM中的开关级。

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