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    • 9. 发明授权
    • Circuit and method for a switching power supply with primary side transformer sensing
    • 具有初级侧变压器感测的开关电源的电路和方法
    • US06333624B1
    • 2001-12-25
    • US09579124
    • 2000-05-30
    • Alan BallKristie Valdez
    • Alan BallKristie Valdez
    • G05F140
    • H02M1/4258H02M3/33523H02M2001/0009Y02B70/126
    • A switching power supply (30) receives an AC voltage at a primary side of a transformer (36) and converts it to a regulated DC output voltage at the secondary side of the transformer (36). The switching power supply (30) includes a voltage regulation compensation circuit (52) to monitor the transformers primary side providing a reference signal VREF related to the transformers secondary side. Signal VCOMP is a current reference signal representative of the primary side inductor current flowing through the emitter of a power transistor (38). VCOMP is fed into a sample and hold circuit (70) and amplified to a DC level proportional to the peak level of the inductor current of the power transistor (38). The output of the sample and hold circuit (70) is fed to two inputs of a multiplier circuit (82) where the output thereof is a square of the two inputs fed to a k-factor circuit (83).
    • 开关电源(30)在变压器(36)的初级侧接收交流电压,并将其转换为变压器(36)的二次侧的稳定的直流输出电压。 开关电源(30)包括电压调节补偿电路(52),用于监视变压器初级侧,提供与变压器次级侧相关的参考信号VREF。 信号VCOMP是表示流过功率晶体管(38)的发射极的初级侧电感器电流的电流参考信号。 VCOMP被馈送到采样和保持电路(70)中并被放大到与功率晶体管(38)的电感电流的峰值电平成比例的直流电平。 采样和保持电路(70)的输出被馈送到乘法器电路(82)的两个输入,其中输出是馈送到k因子电路(83)的两个输入的平方。