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Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency
Pulse-width modulated (PWM) audio power amplifier having output signal magnitude controlled pulse voltage and switching frequency
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机译:具有输出信号幅度控制的脉冲电压和开关频率的脉宽调制(PWM)音频功率放大器
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摘要
An audio switching power amplifier having an output pulse voltage selected in conformity with an indication of the output signal amplitude provides lower electromagnetic interference (EMI) in class-D amplifier implementations, in particular, in inductor-less designs. The output pulse voltage may be selected by providing multiple switching circuits, such as half or fully bridge switches, with each switching circuit connected to a different power supply. One of the switching circuits is activated by the switching controller, while the others are disabled, providing selection of the output pulse voltage. Selection of a lower pulse voltage, when the maximum voltage is not required, reduces the generated EMI. The switching frequency of the class-D amplifier may also be controlled in conformity with the output signal amplitude, so that at higher output levels a lower switching rate is selected, reducing the generated EMI.
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