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    • 8. 发明申请
    • UNIT AND METHOD FOR SYNCHRONOUS RECTIFICATION CONTROL
    • 用于同步整流控制的单元和方法
    • WO2016000754A1
    • 2016-01-07
    • PCT/EP2014/063900
    • 2014-07-01
    • HUAWEI TECHNOLOGIES CO.,LTDMA, JunTSENGENES, GeorgiosTORRICO, Grover
    • MA, JunTSENGENES, GeorgiosTORRICO, Grover
    • H03K17/06H02M1/38H02M3/158H03K17/13
    • H03K17/06H02M1/08H02M1/38H02M3/33592H02M2001/0009H02M2001/0012H03K17/13H03K2017/307Y02B70/1475
    • A unit ant a method for synchronous rectification control unit is disclosed. The synchronous rectification control unit includes a voltage sensing circuit 25 configured to detect body diode conduction for a power switch 14, and to output a voltage pulse signal V DC corresponding to the body diode conduction. The synchronous rectification control unit further includes a capture unit 24 configured to determine a time duration T c for the voltage pulse signal V DC , and to store the time duration T c in a memory. The synchronous rectification control unit further includes a control algorithm circuit 26 configured to determine a turn-on time T on and a turn-off time T off to be used for a synchronous pulse width modulation, PWM, control signal SQ1 or a non-synchronous PWM control signal Q1 during an upcoming switching cycle, wherein the determination of the turn—on T on and turn—off T off times is based on the stored time duration T c . The synchronous rectification control unit further includes a PWM signal generator 32 configured to generate, by use of the determined turn-on T on time and turn-off T off time, the synchronous PWM control signal SQ1 for controlling switching of the power switch 14 when the power switch is in a synchronous side of a circuit; or the non-synchronous PWM control signal Q1 for controlling switching of the power switch 14 when the power switch is in a non-synchronous side of the circuit 100.
    • 公开了一种用于同步整流控制单元的方法。 同步整流控制单元包括电压检测电路25,其被配置为检测功率开关14的体二极管导通,并且输出与体二极管导通相对应的电压脉冲信号VDC。 同步整流控制单元还包括捕获单元24,其被配置为确定电压脉冲信号VDC的持续时间Tc,并将持续时间Tc存储在存储器中。 同步整流控制单元还包括控制算法电路26,其被配置为确定用于同步脉宽调制,PWM,控制信号SQ1或非同步PWM控制的导通时间Ton和关断时间Toff 在即将到来的开关周期期间信号Q1,其中导通Ton和截止Toff时间的确定基于所存储的持续时间Tc。 同步整流控制单元还包括PWM信号发生器32,其被配置为通过使用所确定的接通Ton时间和截止Toff时间来产生用于在功率开关14控制电源开关14的切换时的同步PWM控制信号SQ1 开关处于电路的同步侧; 或用于在电源开关处于电路100的非同步侧时控制电源开关14的切换的非同步PWM控制信号Q1。