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    • 3. 发明授权
    • Half-bridge three-level PWM amplifier and audio processing apparatus including the same
    • 半桥三电平PWM放大器和音频处理装置包括相同
    • US08362832B2
    • 2013-01-29
    • US12850782
    • 2010-08-05
    • Bong-Joo KimWang-Seup YeumYong-Hee LeeSeung-Bin YouChun Kyun Seok
    • Bong-Joo KimWang-Seup YeumYong-Hee LeeSeung-Bin YouChun Kyun Seok
    • H03F3/38
    • H03F3/2173H03G3/007
    • A half-bridge three-level pulse width modulation (PWM) amplifier includes a prescaling unit, a PWM generator configured to convert the input signal to a three-level PWM signal having a first level, a second level and a reference level and an output stage. The prescaling unit scales an input signal according to at least one gain value to provide a scaled signal. The PWM generator varies the width of pulses having the first level and varies the width of pulses having a second level based on the scaled signal. The output stage drives an output node to a level of a first power supply voltage, a second power supply voltage or a third power supply voltage based on the three-level PWM signal. The output node is connected to a load. The magnitude of the at least one gain value compensates for variations of power supply voltages.
    • 半桥三电平脉宽调制(PWM)放大器包括一个预分频单元,一个PWM发生器,被配置为将输入信号转换成具有第一电平,第二电平和参考电平的三电平PWM信号,以及输出 阶段。 预分频单元根据至少一个增益值缩放输入信号以提供缩放信号。 PWM发生器改变具有第一电平的脉冲的宽度,并且基于缩放的信号改变具有第二电平的脉冲的宽度。 输出级基于三电平PWM信号将输出节点驱动到第一电源电压,第二电源电压或第三电源电压的电平。 输出节点连接到一个负载。 至少一个增益值的大小补偿电源电压的变化。