| 摘要 |
A cable node unit power supply circuit, system, and power control method, the power supply circuit of each node unit of a cable being provided with at least a step-down circuit (1) and a soft-start circuit (2), wherein the step-down circuit (1) is used for supplying power to the cable after step-down of the voltage of the input end of a power source (3), and the output voltage of the step-down circuit can be detected on the basis of a voltage feedback end and the output voltage adjusted. When the power source (1) connected to the cable is powered on, the soft-start circuit (2) causes the voltage feedback end of the step-down circuit (1) to detect the magnitude of the voltage increase, such that the step-down circuit (1) reduces the magnitude of the output voltage of the output end, and finally, slow increase in the voltage magnitude of the output voltage of the circuit output end is implemented until a first voltage threshold is reached, thus preventing the relatively large inrush current caused when starting up the system in which the cable is located. |
