Multi-output Control System with Centralized Feedback for Voltage Stability
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Solution Overview
Problem
Existing multi-output control systems face challenges in maintaining stable output voltages across different loads due to varying cable losses, leading to inefficiencies and increased complexity when using voltage compensation mechanisms, especially when DC-DC converters are employed.
Innovation Solution
A multi-output control system comprising a power conversion module, active linear modules, a control module, and a feedback control module that adjusts output powers based on current signals to maintain voltage within predetermined ranges, with active linear modules performing linear conversions only when necessary to minimize energy consumption and reduce circuit complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If DC-DC converters are arranged at the output sides to achieve voltage values within specifications, then the voltage stability of each output is improved, but the cost, circuit complexity, and conversion loss increase
Solution Approach 1:
The patent extracts the voltage compensation function from individual output channels and centralizes it at the input power source. Instead of placing DC-DC converters at each output, the system uses a single feedback control loop at the input to adjust the power source voltage, thereby compensating for cable losses across all outputs simultaneously. This reduces circuit complexity while maintaining voltage stability.
Solution Approach 2:
The feedback control module serves multiple functions: it detects output voltage, calculates cable loss based on current, and adjusts the power source voltage accordingly. This single module handles voltage regulation for all outputs, replacing the need for separate DC-DC converters at each output channel, thus reducing overall system complexity.
2Reliability
If the voltage value of the power source is increased to compensate for cable loss in full loading, then the voltage drop of the cable is compensated, but the output voltage of no loading outputs exceeds specifications
Solution Approach 1:
The system implements a feedback control mechanism where the feedback control module continuously monitors the actual output voltage and compares it with the target voltage. Based on this comparison and the detected load current, the control module dynamically adjusts the power source voltage to maintain accurate compensation without over-volting no-load outputs.
Solution Approach 2:
The power source voltage is made dynamic rather than fixed. The control module continuously adjusts the voltage based on real-time load conditions detected through current sensing. This dynamic adjustment allows the system to provide higher voltage compensation for loaded outputs while preventing over-voltage for no-load outputs, achieving load adaptability.
3Device complexity
If voltage compensation mechanism is not performed, then the circuit simplicity is maintained, but the output voltage of full loading drops below specifications
Solution Approach 1:
The patent introduces an intermediary feedback control module that sits between the power source and the outputs. This module acts as a mediator by adjusting the power source voltage based on detected cable losses, thereby compensating for voltage drops without requiring complex DC-DC converters at each output. The intermediary maintains voltage stability while preserving circuit simplicity.
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 system effectively maintains output voltages within specifications across varying loads, reducing energy consumption and circuit complexity by selectively performing linear conversions only when required, thereby enhancing overall efficiency and preventing voltage-related malfunctions.
Implementation Method 1
the feedback control module is configured to receive the output power. The control module is configured to control the feedback control module to adjust the output power based on the current signals
Implementation Method 2
The first active linear module and the at least one second active linear module are configured to determine whether a difference value between a current value of the first output power and a current value of the at least one second output power is greater than a current difference predetermined value
Data Source
AI summary
A multi-output control system includes a power conversion module, a first active linear module, a second active linear module, a control module and a feedback control module. The control module controls the feedback control module to adjust an output power based on current signals. The first active linear module and the second active linear module determine whether a difference value between a current value of a first output power and a current value of a second output power is greater than a current difference predetermined value based on the current signals, and the control module adjusts a voltage value of the first output power and a voltage value of the second output power to respectively be within a predetermined voltage range based on the current signals.