Power Control Circuit for Vibration Energy Harvesting
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Solution Overview
Problem
Vibration power generators face challenges in measuring current due to low power generation, making it difficult to perform maximum power point tracking control efficiently, which is essential for maximizing power output.
Innovation Solution
A power control circuit that includes a converter, signal generation circuit, and control circuitry, which measures power based on output voltage and switching operation parameters, allowing for maximum power point tracking control without the need for current measurement, using a buck-boost converter and a power measurement method that calculates power using the root mean square value of the output voltage and equivalent resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current measurement is performed to calculate power for maximum power point tracking control, then power measurement accuracy is improved, but power consumption increases beyond the generated power
Solution Approach 1:
The patent extracts the current measurement function from the power calculation process. Instead of measuring current directly, the system calculates power using only voltage measurements and known circuit parameters (equivalent resistance), thereby eliminating the need for current measurement and its associated power consumption.
Solution Approach 2:
The patent introduces equivalent resistance as an intermediary parameter. By using the relationship P = V²/R where R is the known equivalent resistance, the system can calculate power from voltage measurements alone, avoiding direct current measurement while maintaining calculation accuracy.
2Productivity
If maximum power point tracking control is implemented using conventional power measurement methods, then power generation efficiency is improved, but device complexity increases due to additional measurement requirements
Solution Approach 1:
The patent removes the current measurement component from the measurement system. By calculating power based on voltage measurements and known equivalent resistance, the system maintains maximum power point tracking capability while simplifying the measurement infrastructure.
Solution Approach 2:
The system uses its own known parameters (equivalent resistance) to enable power calculation without external measurement aids. The controller leverages pre-known circuit characteristics to perform power measurements that would otherwise require additional sensors.
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
Enables maximum power point tracking control with low power consumption, effectively maximizing power generation from vibration power generators by adjusting the equivalent resistance without requiring current measurement.
Implementation Method 1
Vibration power generators are power generators that convert mechanical energy produced by mechanical vibrations into electrical energy
Implementation Method 2
The converter transforms an output voltage from a power generator. The converter includes a switching circuit
Implementation Method 3
the equivalent resistance of electrical circuitry connected to the vibration power generator should be set to an appropriate value that corresponds to the ambient vibrations
Data Source
AI summary
A power control circuit includes a converter, a signal generation circuit, and control circuitry. The converter includes a switching circuit. The converter transforms an output voltage from a power generator. The signal generation circuit operates the switching circuit of the converter. The control circuitry changes an operation of the switching circuit.