| 摘要 |
A filter system and a method for filtering an analog signal includes an analog-to-digital converter with an input to which an analog filter input signal is supplied, and an output at which an impulse signal is available that includes a sequence of impulses, the number of the impulses per time unit depending on the magnitude of the filter input signal. The filter system is further provided with a counter system to which the impulse signal is supplied and that contains at least one counter. At least once during an interval of evaluation, a counter reading of the at least one counter is supplied to a digital-to-analog converter to produce an analog filter output signal, the amplitude of the filter output signal depending on the value of the counter reading. The filter system can be placed in a power factor controller. |
