Inverter Voltage Control via Frequency Modulation
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Summary
Problems
Fluorescent lamp arrays face challenges in maintaining stable voltage output due to the instability of analog components, which is exacerbated by varying operating temperatures, manufacturing variations, and aging, leading to issues like arcing and inadequate light output.
Innovation solutions
A method involving a microcontroller circuit that uses firmware to calculate and adjust the frequency of digital switch control signals based on a transfer function, allowing for precise control of inverter voltage and reducing the need for tight component tolerances, thereby stabilizing the voltage output.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If traditional inverter circuits are used without frequency control, then the device complexity is low, but the inverter voltage becomes unstable due to varying temperature, manufacturing variations, and aging
Why choose this principle:
The patent implements a feedback control system where the inverter voltage is monitored and the digital switch control signal frequency is automatically adjusted based on the measured voltage deviation from the set point. This closed-loop feedback mechanism maintains stable inverter voltage despite temperature variations, manufacturing tolerances, and component aging, resolving the contradiction between reliability and complexity by introducing intelligent control.
Principle concept:
If traditional inverter circuits are used without frequency control, then the device complexity is low, but the inverter voltage becomes unstable due to varying temperature, manufacturing variations, and aging
Why choose this principle:
The patent changes the frequency parameter of the digital switch control signal dynamically to compensate for inverter voltage deviations. By adjusting this key parameter based on feedback, the system maintains stable output voltage without requiring tight component tolerances or complex hardware modifications, thus improving reliability while managing device complexity.
Application Domain
Data Source
AI summary:
A method involving a microcontroller circuit that uses firmware to calculate and adjust the frequency of digital switch control signals based on a transfer function, allowing for precise control of inverter voltage and reducing the need for tight component tolerances, thereby stabilizing the voltage output.
Abstract
A method and firmware for controlling an inverter voltage includes steps of receiving as input a digitized feedback signal representative of an inverter voltage that varies with frequency according to a transfer function, calculating a frequency of a digital switch control signal in firmware in an inverter voltage microcontroller by the transfer function from the digitized feedback signal to adjust the inverter voltage to a set point value, and generating the digital switch control signal having the calculated frequency by firmware in the inverter voltage microcontroller as output to generate the inverter voltage at the set point value.