DCDC Converter Target Voltage Compensation for Temperature Drift
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Solution Overview
Problem
Existing DCDC converters face challenges in achieving highly accurate power supply voltages due to the slight temperature dependence of band gap reference circuits, which affects the output voltage's temperature characteristics.
Innovation Solution
A DCDC converter is designed with a temperature sensor, a reference voltage generator circuit, a compensation calculator that uses a quadratic function of temperature, a compensator to correct the target initial value, and a digital-to-analog converter to generate a highly accurate target voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a band gap reference circuit is used to generate reference voltage, then the DCDC converter can operate with a stable reference voltage, but the output voltage exhibits temperature dependence and cannot achieve high accuracy
Solution Approach 1:
The patent changes the parameter of reference voltage by introducing a temperature compensation mechanism. A temperature sensor detects the actual temperature, and a compensation value is calculated and applied to adjust the reference voltage dynamically, thereby eliminating temperature dependence while maintaining stability.
Solution Approach 2:
The patent implements a feedback loop where the temperature sensor continuously monitors temperature conditions, and the compensation value is fed back to adjust the reference voltage. This closed-loop control ensures that the output voltage remains accurate across varying temperature conditions while preserving the stability provided by the band gap reference circuit.
2Manufacturing precision
If temperature compensation is implemented using a linear function, then some temperature dependence is reduced, but the compensation is not optimal when temperature characteristics vary
Solution Approach 1:
The patent transitions from a static linear compensation approach to a dynamic quadratic compensation approach. The compensation value is calculated using a quadratic function of temperature, allowing the system to adapt to varying temperature characteristics and provide optimal compensation across different operating conditions.
Solution Approach 2:
The patent changes the mathematical model from a linear function to a quadratic function for temperature compensation. This parameter change in the compensation algorithm enables better fitting of actual temperature characteristics and improves both accuracy and adaptability to varying thermal conditions.
Data Source
AI summary
A direct current to direct current converter is disclosed that controls an output voltage based on an error signal between a feedback voltage and a target voltage. A direct current to direct current converter according to one or more embodiments may include a temperature sensor, a reference voltage generator circuit that generates a reference voltage, a compensation calculator that calculates a compensation value from a temperature detected from the temperature sensor using a function of temperature, a compensator that corrects a target initial value by the compensation value to generate the target value, and a digital-to-analog converter that converts the target value to the target voltage based on the reference voltage.