Active Wire Compensation Circuit for DC-DC Buck Converters
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Solution Overview
Problem
Existing DC-to-DC buck converters experience voltage loss due to parasitic resistance in wires, and traditional remote sensing methods increase circuit costs and complexity, especially as transmission distance increases.
Innovation Solution
An active wire compensation circuit that modulates the output voltage detecting signal using a compensating current to stabilize the load voltage, eliminating the need for additional sensing wires by using a compensating unit to detect load current and generate a compensating current, which is then used to adjust the feedback signal for precise power loss compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a detecting wire is connected for remote sensing the load voltage, then the voltage loss on the wire is compensated, but the circuit cost increases
Solution Approach 1:
The patent extracts the voltage loss compensation function from the traditional remote sensing approach by removing the need for additional detecting wires. Instead, it uses the existing current detecting circuit to generate a compensating voltage that is directly added to the feedback signal, achieving wire loss compensation without adding physical sensing wires to the load end.
Solution Approach 2:
The patent introduces a compensating voltage as an intermediary element that mediates between the current detection and the feedback control. This compensating voltage, generated through the current detecting circuit and compensation capacitor, serves as a substitute for direct voltage sensing at the load end, enabling indirect but accurate compensation of wire losses.
2Length of stationary object
If the power transmission distance increases, then the load coverage is extended, but the voltage loss on the wire increases
Solution Approach 1:
The patent employs feedback control by continuously monitoring the load current through the current detecting circuit and using this information to dynamically adjust the compensating voltage. This closed-loop feedback mechanism ensures that as transmission distance and corresponding voltage losses increase, the compensation automatically scales to maintain stable load voltage.
Solution Approach 2:
The patent performs preliminary compensation by proactively generating the compensating voltage based on detected load current before the voltage loss affects the load. The compensation capacitor stores and releases energy in advance to counteract the inevitable voltage drop over extended transmission distances.
3Loss of energy
If traditional remote sensing is used, then voltage compensation is achieved, but additional detecting wires are required
Solution Approach 1:
The patent makes the current detecting circuit multi-functional by having it serve both its original purpose of current monitoring and the additional function of generating compensating voltage for wire loss compensation. This eliminates the need for separate detecting wires, as the existing current sensing infrastructure is utilized for dual purposes.
Solution Approach 2:
The patent merges the voltage compensation function with the current detection function by combining the compensating current generation and compensating voltage production into a single integrated process. This consolidation eliminates the need for separate physical detecting wires at the load end, reducing component quantity while maintaining compensation effectiveness.
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
This solution effectively stabilizes the load voltage at a predetermined level without the need for remote sensing wires, reducing circuit costs and maintaining voltage stability across increased transmission distances.
Implementation Method 1
an operational amplifier having a non-inverted input, an inverted input and an output, the non-inverted input receiving the output voltage detecting signal, the inverted input receiving the compensating current, and the output outputting the compensated output voltage detecting signal
Data Source
AI summary
An active wire compensation circuit, adapted to compensate a level of an output voltage detecting signal, is disclosed. A feedback controller controls a converting circuit according to the compensated output voltage detecting signal to have a load voltage for driving a load stabilized at a predetermined voltage level. The active wire compensation circuit comprises a compensating unit and a feedback compensating unit. The compensating unit detects the load current flowing through the load and accordingly generates a compensating current. The feedback compensating unit modulates the level of the output voltage detecting signal according to the compensating current and generates the compensated output voltage detecting signal.