DC-DC Converter Trimming with DAC Code Reuse for Voltage Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing DC-DC converters suffer from gain and offset errors due to imperfections in reference voltage generation and resistor values, leading to inaccuracies in the output DC voltage.
Innovation Solution
A voltage conversion system with adjustable reference circuits and digital-to-analog converters (DACs) that perform gain and offset trimming, using resistive networks and control circuitry to adjust resistance values and achieve precise output voltage ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard reference voltage generation and fixed resistor values are used, then device complexity is reduced, but manufacturing precision deteriorates due to gain and offset errors
Solution Approach 1:
The patent applies preliminary action by performing gain and offset trimming during the manufacturing process. Adjustable reference circuits are configured to specific resistance values beforehand to compensate for component tolerances. This pre-calibration ensures high output voltage precision without requiring complex real-time adjustment mechanisms, thus resolving the contradiction between manufacturing precision and device complexity.
Solution Approach 2:
The patent changes the resistance parameters of adjustable reference circuits to optimize performance. By varying resistance values within specific ranges during trimming, the system achieves precise gain and offset adjustment. This parameter adjustment allows high manufacturing precision while maintaining relatively simple circuit architecture, addressing the technical contradiction.
2Manufacturing precision
If adjustable reference circuits with multiple selectable taps are added, then manufacturing precision is improved through gain and offset trimming, but device complexity increases
Solution Approach 1:
The patent segments the reference voltage generation into multiple adjustable reference circuits, each with selectable taps providing different resistance values. This segmentation allows independent adjustment of gain and offset parameters. By dividing the adjustment function into discrete selectable options rather than continuous adjustment, the patent achieves high output voltage accuracy while keeping the circuit configuration manageable and not excessively complex.
3Manufacturing precision
If trimming procedures are implemented to correct gain and offset errors, then manufacturing precision is enhanced, but loss of time occurs during calibration
Solution Approach 1:
The trimming procedure is performed as a preliminary action during the manufacturing and initialization phase. By completing the gain and offset calibration beforehand, the system achieves high output voltage precision without requiring time-consuming adjustments during operation. This preliminary calibration resolves the contradiction by accepting time investment during manufacturing in exchange for precision during product use.
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 system achieves highly precise and accurate output DC voltage by correcting gain and offset errors, ensuring the output voltage falls within the desired range and meets specified accuracy requirements.
Implementation Method 1
A digital-to-analog converter (DAC) is configured to generate a reference voltage based on an input code
Implementation Method 2
The first adjustable reference circuit may include a resistive network with multiple selectable taps. The control circuitry may adjust the first adjustable reference circuit by selecting among the multiple selectable taps to set a resistance value.
Data Source
AI summary
A voltage conversion system provides gain and offset trimming for generating a controlled output voltage. The system includes a digital-to-analog converter (DAC) that generates a reference voltage based on an input code, and a voltage converter that converts an input voltage to an output voltage based on the reference voltage. A first adjustable reference circuit provides a first reference signal to the DAC and a second adjustable reference circuit provides a second reference signal to the DAC. Control circuitry adjusts the first adjustable reference circuit to perform gain trimming of the output voltage and adjusts the second adjustable reference circuit to perform offset trimming of the output voltage. A calibration procedure includes adjusting for both gain and offset, with a two-step approach for positive offset conditions—first incrementing the input code to create a negative offset, then performing offset trimming.