| 摘要 |
PROBLEM TO BE SOLVED: To provide a liquid level detection method capable of applying a highly-reliable output signal.SOLUTION: Method and corresponding apparatus for liquid level detection with a capacitive liquid level detector (14) includes the steps of: generating a clock signal with a predetermined on-time (t1) corresponding to a predetermined sensitivity of the capacitive liquid level detector (14); being fed both to a reference generator (12) and to the capacitive liquid level detector (14); the reference generator (12) generating a control value derived from an on/off ratio of the clock signal and feeding it into a control input (19) of a comparator (18); feeding a liquid detection response signal of the capacitive liquid level detector (14) in response to the clock signal into a signal input (20) of the comparator (18); and the comparator (18) triggering an output signal at an output (21) when the liquid detection response signal exceeds a threshold in response to a change of the input capacitance (C) of the capacitive liquid level detector (14). |
