Voltage Compensation Circuit for Power Supply Load Current Detection
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Solution Overview
Problem
Existing voltage compensation methods in power supplies are prone to inaccuracies due to instability in load feedback, leading to incorrect compensation of output voltage when the load's power demand changes.
Innovation Solution
A voltage compensation circuit and method that includes a current detection unit, voltage conversion unit, voltage comparison unit, control circuit, and voltage compensation unit, which detect load current, generate a switch control signal, and provide a compensation resistance value to adjust the output voltage accurately based on load demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback compensation method is used to compensate output voltage, then transmission loss can be compensated, but compensation accuracy deteriorates due to feedback instability
Solution Approach 1:
The patent introduces a current detection unit as an intermediary to detect load current directly from the power supply side, rather than relying on feedback from the load side. This intermediary measurement approach converts the unstable feedback problem into a stable direct measurement, resolving the contradiction between compensation capability and measurement accuracy.
Solution Approach 2:
The patent implements a new feedback mechanism where the detected load current is converted to a compensation voltage through the voltage conversion unit and switch network. This creates a closed-loop system that continuously adjusts the compensation voltage based on actual load current, improving both reliability and measurement precision simultaneously.
2Adaptability or versatility
If load feedback is used for voltage compensation, then output voltage can be adjusted, but compensation error increases due to feedback instability
Solution Approach 1:
The patent replaces the unstable mechanical/electrical feedback system with an electronic detection and conversion system. By using the current detection unit to measure load current and the voltage conversion unit to generate compensation voltage, the system achieves precise voltage adjustment without the instability inherent in traditional feedback mechanisms.
Solution Approach 2:
The patent changes the measurement parameter from voltage feedback to current detection. By detecting load current directly and converting it to compensation voltage through controlled resistance switching, the system achieves both adaptability to load changes and high compensation precision, resolving the contradiction between voltage adjustment capability and compensation precision.
Data Source
AI summary
A voltage compensation circuit and a voltage compensation method are provided. The voltage compensation circuit detects the load current provided by a power supply, generates a load voltage according to the load current, and compares the load voltage with at least one reference voltage to generate a switch control signal. The voltage compensation circuit further drives the at least one switch according to the switch control signal, provides a compensation resistance value according to the at least one switch that is turned on, and provides a compensation voltage to the power supply, so that the power supply provides a precise output voltage.