Power Supply Controller Error Amplifier Bias Signal Extraction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing power supply controllers have complex configurations and high costs due to the use of amplifiers that introduce errors in output voltage regulation, particularly when handling large current loads.
Innovation Solution
A power supply controller configuration that receives a current sense signal prior to amplification, using a differential amplifier circuit to subtract bias signals and minimize errors, thereby improving the accuracy of output voltage regulation without relying on complex amplifier loops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If amplifiers are used to convert load current information to regulation signals, then the power supply controller can regulate output voltage, but the amplifiers introduce errors that affect output voltage accuracy and increase device complexity
Solution Approach 1:
The patent extracts the bias signal component from the feedback signal using a differential amplifier configuration. By subtracting the bias signal (which contains error components) from the total feedback signal, the circuit isolates the useful information while eliminating the harmful bias errors, thus improving measurement precision without requiring complex amplifier loops
Solution Approach 2:
The differential amplifier acts as an intermediary that processes the feedback signal by comparing it against a reference bias signal. This intermediary stage transforms the erroneous feedback signal into a corrected error signal that can be used for accurate voltage regulation, resolving the contradiction between accuracy and complexity
2Power
If amplifiers are used to handle large current loads, then the power supply can provide high output current, but the amplifiers increase cost and introduce regulation errors
Solution Approach 1:
The patent converts the harmful bias signal (which contains error information) into a useful reference for error correction. By using the differential amplifier to subtract the bias signal from the feedback signal, the circuit transforms the previously harmful amplified error into a beneficial correction mechanism, enabling accurate regulation even when handling large current loads
3Measurement precision
If complex amplifier loops are used to regulate output voltage, then voltage regulation can be achieved, but the system becomes costly and introduces errors in synthesized impedance
Solution Approach 1:
The patent creates a simplified copy of the error signal generation process by directly using the differential amplifier to generate the error signal from the feedback signal, bypassing the need for complex multi-stage amplifier loops. This copied approach maintains regulation accuracy while significantly reducing device complexity and cost
Data Source
AI summary
In one embodiment, an error amplifier of a power supply controller is configured to receive a current sense signal prior to the current sense signal undergoing amplification.