Power conversion chip precision calibration method and system

By introducing an MCU and a DAC into the power conversion chip and combining them with an ADC for digital closed-loop calibration, the problem of insufficient accuracy in traditional power conversion chips is solved, achieving high-precision and flexible power output that can adapt to different application requirements and resist the effects of temperature and aging.

CN122172652APending Publication Date: 2026-06-09CHENGDU HUANYUXIN TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
CHENGDU HUANYUXIN TECH
Filing Date
2026-02-03
Publication Date
2026-06-09

AI Technical Summary

Technical Problem

The output voltage accuracy of traditional power conversion chips is limited by the initial accuracy of resistors, temperature drift, reference voltage error, and semiconductor process deviation, making it difficult to meet the requirements of high-precision applications.

Method used

By employing a microcontroller (MCU) combined with a resistive digital-to-analog converter (DAC) and a high-precision analog-to-digital converter (ADC), the output voltage is calibrated in real time through a digital closed-loop method, replacing the traditional resistive voltage divider network and achieving improved accuracy.

Benefits of technology

It improves the power supply output voltage accuracy to ยฑ0.6% and can adapt to different output voltage requirements. It has high flexibility and robustness and continuously compensates for parameter drift caused by temperature changes and device aging.

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Abstract

The application relates to an accuracy calibration method and system of a power conversion chip, and relates to electronic technology.The method comprises the following steps: (1) calculating a DAC initial code according to a target output voltage, and taking the DAC initial code as an output voltage control code of a controllable power supply; (2) carrying out analog-digital conversion on an actual output voltage of the controllable power supply, and calculating a difference between the actual output voltage and the target output voltage; (3) if the difference is greater than a preset value, entering step (4), otherwise, returning to step (2) after waiting for a predetermined time length; (4) adjusting the voltage control code according to the difference data, and returning to step (2). The application calibrates the power supply output in a digital closed loop mode, and effectively overcomes the accuracy limitation of a traditional analog feedback network.
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