| 摘要 |
A switched mode power supply comprises at least one power switch adapted to convey power between input and output terminals of the power supply, and a digital controller adapted to control operation of the at least one power switch responsive to an output parameter of the power supply. The digital controller comprises an analog-to-digital converter providing a digital error signal representing a difference between the output parameter and a reference value, a digital filter providing a digital control output based on a sum of current and previous error signals and previous control outputs, the error signals comprising integers having a relatively low numerical range and said control outputs comprising integers having a relatively high numerical range, and a digital pulse width modulator providing a control signal to the power switch having a pulse width corresponding to the digital control output. The digital filter further comprises an asymmetric arithmetic unit adapted to combine the low range integers with the high range integers.
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