Power Supply Circuit for PLC Transmission Distance
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Solution Overview
Problem
Current power supply circuits for DC-PLC systems face challenges in extending transmission distance and improving communication performance due to voltage drops and intermittent operations caused by conductor resistance and noise generation in DC power lines.
Innovation Solution
A power supply circuit incorporating a step-down DC/DC converter, a step-up/down DC/DC converter, and a switch circuit that adjusts connections based on voltage values to manage voltage levels and prevent intermittent operations, thereby extending transmission distance and enhancing communication performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a simple power supply circuit is used, then device complexity is reduced, but transmission distance cannot be extended and communication performance deteriorates due to voltage drops
Solution Approach 1:
The power supply circuit dynamically switches between step-down mode and step-up mode based on the detected voltage level. When voltage is high (near power source), it steps down; when voltage is low (far from power source), it steps up. This dynamic adaptation enables extended transmission distance while maintaining stable operation.
Solution Approach 2:
The power supply circuit incorporates both step-down and step-up DC/DC converter capabilities in a single system. This multi-functional design allows the same circuit to handle both voltage reduction (when near power source) and voltage boosting (when far from power source), eliminating the need for separate circuits and reducing overall complexity.
2Length of moving object
If voltage is supplied directly over long DC power lines, then transmission distance is extended, but voltage drops cause intermittent operations and noise generation
Solution Approach 1:
The circuit changes its operating parameters (switching between step-down and step-up modes) based on the detected voltage level. This parameter adaptation ensures that the output voltage remains within the stable operating range regardless of the input voltage variations caused by long transmission distances, preventing intermittent operations.
Solution Approach 2:
The voltage detection circuit continuously monitors the input voltage level and provides feedback to control which converter mode is active. This feedback mechanism ensures that the power supply circuit automatically adjusts to maintain stable output voltage, preventing intermittent operations and reducing noise.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively extends the transmission distance and improves communication performance by managing voltage levels and reducing noise interference, ensuring stable operation of PLC modems over longer distances.
Implementation Method 1
a step-down DC/DC converter that steps down and outputs the voltage supplied from the power line
Implementation Method 2
a step-up DC/DC converter that steps up or steps down the voltage output from the step-down DC/DC converter or the voltage supplied from the power line
Data Source
AI summary
To extend the transmission distance with the voltage supply source and improve the communication performance of PLCs Solution. The power supply circuit includes a step-down DC/DC converter to which a voltage supplied from the power line is input and to which an input voltage is stepped down and output, a step-up/down DC/DC converter to which a voltage output from the step-down DC/DC converter or a voltage supplied from the power line is input and to which the input voltage is stepped up or stepped down and output to the power line communication circuit, a switch circuit for connecting an input of the step-up/down DC/DC converter to an output of the step-down DC/DC converter or power line, a voltage monitoring circuit for monitoring a voltage supplied from the power line, and a control circuit for controlling connection of the switch circuit based on the voltage value of the voltage supplied from the power line.