| 摘要 |
Medical infusion system (1,11,21,31) comprising a control signal generator (2,12), a safety circuit (3,13) consisting of a high-pass circuit, a switching device (4,14) and a pump DC motor (5), wherein the pump motor (5) and the switching device (4,14) are connected in series and constitute a power supply circuit to be connected to a power supply. The control signal generator (2,12), configured to generate an AC control signal e.g. PWM, is connected to the input (3a,13a) of the safety circuit (3,13). The output (3b,13b) of the safety circuit (3,13) is connected to a control input (3a,13a) of the switching device (4,14). The pump DC motor (5) will not operate, if there is no AC signal applied to the input of the safety circuit (3,13). |
