Power Converter Current Detection via Voltage and Power Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional power converting apparatuses face instability due to inaccurate current detection at the input terminal, leading to inductor saturation and switch malfunctions when load variations occur, resulting in sudden current increases and potential short-circuits.
Innovation Solution
A power converting apparatus with improved current detection capabilities, including a converting current detecting part, converting voltage detecting part, and a controlling part that calculates power values and adjusts switching to maintain power within a predetermined range, using a switch, inductor, capacitors, and diodes to stabilize power conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If current detection is performed at the input terminal of the power converter, then the detection structure is simple, but the current detection accuracy deteriorates leading to inductor saturation and switch malfunction
Solution Approach 1:
The patent introduces an intermediary calculation process where the controller computes the actual current based on measured voltage and power relationships (I = P/V) rather than directly measuring current at the input terminal. This intermediary approach maintains structural simplicity while improving measurement accuracy by deriving current from more reliable voltage and power measurements.
Solution Approach 2:
The patent replaces direct current measurement (electrical measurement) with a calculation-based approach using voltage and power measurements. By substituting direct current sensing with computational derivation from electrical parameters, the system achieves better accuracy without proportionally increasing hardware complexity.
2Ease of operation
If the controller operates based on inaccurate current detection, then the control operation is simple, but the power conversion stability deteriorates causing sudden current increases
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors voltage and calculates power, then uses this information to adjust switching operations. This closed-loop feedback ensures power conversion stability by constantly comparing actual performance with target values and making real-time adjustments, while maintaining operational simplicity through automated control algorithms.
Solution Approach 2:
The patent performs preliminary calculations of expected current based on target power and measured voltage before executing switching operations. By pre-calculating the required current and comparing it with actual conditions, the controller can proactively adjust switching timing and duration to maintain stability, preventing sudden current increases before they occur.
3Speed
If the inductor current increases suddenly due to inaccurate detection, then the response speed is fast, but the reliability deteriorates causing short-circuit and malfunction
Solution Approach 1:
The patent performs preliminary verification of current values through voltage and power-based calculations before executing switching operations. By pre-validating current measurements and comparing them with calculated expectations, the system can detect and correct inaccurate measurements before they cause harmful current increases, maintaining fast response while ensuring reliability.
Solution Approach 2:
The patent implements preliminary anti-action by calculating expected current values and using them to verify actual current measurements before switching operations. When discrepancies are detected, the system counteracts potential harmful effects by adjusting switching parameters based on calculated values, preventing short-circuits and malfunctions before they can occur.
Data Source
AI summary
A power converting apparatus includes a power input part to which power is input; a power converting part converting the power input through the power input part; a converting current detecting part detecting a converting current of the power converted in the power converting part; a converting voltage detecting part detecting a converting voltage of the power converted in the power converting part; and a controlling part controlling the power converting part so that a value of power calculated by multiplication of the converting current detected in the converting current detecting part by the converting voltage detected in the converting voltage detecting part falls within a predetermined range of a preset reference value.