Power supply system using signal line

Abstract

The invention provides a power supply system using a signal line. The power supply system comprises a master unit and at least one slave unit, wherein the master unit is connected with each slave unit through a ground wire GND and a communication signal line SP. The master unit comprises a power supply module, a power supply monitoring module and a main communication module. The power supply monitoring module monitors a current value and a voltage value of the communication signal line output by the power supply module, and feeds back data information of the current value and the voltage value to the power supply module. Each salve unit at least comprises a one-way conducting module and a slave communication module; the master communication module and the slave communication module are connected through the communication signal line; an output end of the power supply module is connected with the communication signal line, one end of the one-way conducting module is connected with the communication signal line, and the other end of the one-way conducting module is connected with the ground wire; and the power supply module supplies power to the salve unit according to the signal feedback of the power supply control module according to the existence of the communication signal line or not.

Description

technical field [0001] The invention relates to the communication field, in particular to a system for supplying power through a signal line. Background technique [0002] At present, the main implementation methods for the equipment or internal components of the equipment to supply power through their external communication lines mainly include the following points. [0003] One method is to transform the current communication interface and add a new circuit on top of the standard interface to realize external power supply. For example, by adding a rectifier circuit, input filter, voltage regulator, and output filter circuit to the standard RS485 bus system, the power supply to the terminal node through the two communication lines of RS485 is realized. [0004] Another method and system for supplying power to external devices through Ethernet includes adding a power supply unit, a port device detection unit, and a mode switching unit, and using Ethernet idle lines or signa...

AI Technical Summary

Problems solved by technology

This method usually has the defect of only one-way communication, or it needs to occupy more input and output ports on the host side; or the program design is complicated, requiring that the output terminal must use an input and output port for analog sampling to monitor The voltage on the communication line increases the power supply when the voltage drops to close to the lower limit of the device's work; at the same time, the receiving end of the receiving device needs to distinguish different voltages to judge the communication information

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