Power Supply Voltage Measurement With Periodic ADC Calibration
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Solution Overview
Problem
Current DC power supply systems and voltage measurement systems face challenges in providing high precision and efficiency, particularly in achieving high effective number of bits (ENOB) in analog-to-digital converters (ADCs) and managing power supply systems to control electrical devices effectively without additional feedback sensors.
Innovation Solution
The system comprises a power supply unit with a controller that generates voltage and current control signals, utilizing power electronics and sensors to manage power delivery, and includes a trained machine learning model to optimize power dissipation characteristics, along with analog-to-digital converters and baseline reference circuits for precise voltage measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ADC is designed to provide full ENOB, then measurement precision is improved, but sampling rate decreases
Solution Approach 1:
The system uses periodic sampling at a reduced rate combined with periodic calibration measurements to achieve high precision without requiring continuous high-speed sampling. The calibration is performed periodically to correct drift and maintain full ENOB accuracy over time while allowing lower sampling rates during normal operation.
Solution Approach 2:
The system performs preliminary calibration measurements to establish reference values before normal operation begins. These pre-established references are used to correct subsequent measurements, allowing the ADC to maintain full precision without requiring continuous high-speed sampling for calibration purposes.
2Measurement precision
If power supply system uses traditional control methods, then device complexity is reduced, but control precision and efficiency deteriorate
Solution Approach 1:
The power supply system uses the load itself as the sensing element by measuring voltage and current at the output terminals. The control system calculates power dissipation and derives all necessary control information from these measurements without requiring external feedback sensors. This self-service approach achieves high precision control while minimizing additional hardware complexity.
Solution Approach 2:
The same voltage and current measurement circuits used for power delivery control are also used for precision voltage measurement and power dissipation calculation. This multi-functional use of existing components eliminates the need for separate precision measurement hardware, achieving high precision without proportionally increasing system complexity.
3Device complexity
If power supply system operates without feedback sensors, then device complexity is reduced, but control reliability deteriorates
Solution Approach 1:
The system implements feedback control using voltage and current measurements taken at the power supply output terminals. These measurements provide real-time information about the actual power delivery conditions, enabling the controller to adjust output to maintain desired voltage, current, or power levels with high reliability without requiring additional external feedback sensors.
Data Source
AI summary
Example embodiments of the described technology provide power supply systems and methods. An example power supply system may comprise a loading circuit comprising power electronics configured to apply DC electrical power to a load. The power supply system may also comprise a power supply unit coupled to drive the loading circuit. The power supply unit may comprise a converter configured to convert input AC electrical power to DC electrical power. The power supply system may also comprise a controller. The controller may be configured to generate a voltage control signal and a current control signal to be received as input by the loading circuit. The voltage control signal and current control signal may represent voltage and current values to be applied to the load. The controller may also be configured to determine a voltage level to be supplied by the power supply unit to the loading circuit. The controller may also be configured to generate a signal to be received by the power supply unit representing the voltage level to be supplied by the power supply unit to the loading circuit. The power supply system may comprise a circuit for measuring voltage with high precision.