Non-Linear Current Detection Circuit for Resonant Polarity Sensing
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Solution Overview
Problem
Existing resonant power supply circuits face challenges in accurately detecting the polarity of resonant current while maintaining low power consumption, as small shunt resistor values lead to incorrect detection and high values increase power consumption.
Innovation Solution
A current detection circuit is designed with a second capacitor and a non-linear circuit between the second end of the second capacitor and the first capacitor, which outputs a detection voltage from the second end of the second capacitor, allowing accurate polarity detection of resonant current while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resistance value of the shunt resistor is increased, then the polarity of the resonant current can be accurately detected, but the power consumption in the shunt resistor increases
Solution Approach 1:
The patent introduces a non-linear circuit as an intermediary between the shunt resistor and the detection circuit. This non-linear circuit processes the small voltage signal from the shunt resistor to enhance the detection of polarity changes without requiring an increase in the shunt resistor's resistance value, thereby maintaining low power consumption while improving detection accuracy
Solution Approach 2:
The patent changes the detection parameter from directly measuring voltage across a high-value shunt resistor to detecting current through a low-value shunt resistor and then processing this signal through a non-linear circuit. This parameter transformation allows accurate polarity detection with minimal power consumption
2Use of energy by moving object
If the resistance value of the shunt resistor is small, then the power consumption is reduced, but the polarity change may not be correctly detected
Solution Approach 1:
The non-linear circuit serves as a signal processing intermediary that takes the weak voltage signal from the low-value shunt resistor and transforms it into a detectable polarity change signal, enabling accurate detection without compromising power efficiency
Solution Approach 2:
The patent transitions from a single-dimension approach (direct voltage measurement) to a two-dimension approach by adding the non-linear circuit dimension for signal processing, enabling accurate polarity detection with small shunt resistors
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 enables accurate detection of resonant current polarity with reduced power consumption by utilizing a non-linear circuit configuration that enhances voltage change detection, thereby preventing off-resonance occurrences.
Implementation Method 1
a non-linear circuit provided between the second end of the second capacitor and the second end of the first capacitor
Implementation Method 2
a resonant circuit that has an inductor, and a first capacitor having a first end and a second end
Data Source
AI summary
A current detection circuit configured to detect a resonant current of a power supply circuit. The power supply circuit includes a resonant circuit that has an inductor and a first capacitor having a first end and a second end. The current detection circuit includes a second capacitor having a first end and a second end, and a non-linear circuit provided between the second end of the second capacitor and the second end of the first capacitor. The first end of the second capacitor is coupled to the first end of the first capacitor.