| 摘要 |
A power conversion system comprising at least one Pulse Modulated Amplifier ( 1 ), including a pulse modulator for generating a pulse modulated signal based on a reference input (v<SUB>i</SUB>), a switching power stage arranged to amplify the pulse modulated signal, and a control system arranged to compensate for power supply voltage variations, and a voltage supply ( 2 ) providing drive voltage (V<SUB>s</SUB>) to each amplifier, wherein said voltage supply ( 2 ) is provided with said input reference (v<SUB>i</SUB>), and arranged to provide a first drive voltage component (V<SUB>s</SUB>) tracking an amplified absolute value of the input reference (v<SUB>i</SUB>). Pulse area modulation according to the invention will result in improved efficiency and at the same time ensure lower levels of EMI, as the mean amplitude of the PAM signal is lowered. |
