Power Supply Correction Circuit for Signal Distortion
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Solution Overview
Problem
Current power supply control systems face issues with signal distortion due to propagation delay and sub-harmonic oscillation, particularly in continuous conduction mode with PWM signals above 50% duty, leading to increased circuit area and costs.
Innovation Solution
A device and method that utilize an oscillator to generate down-slope and up-slope waveforms for creating correction signals, which are superimposed onto detected signals to correct propagation delay and sub-harmonic oscillation, respectively, thereby reducing circuit area and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate circuits are used for first correction and second correction, then signal distortion correction is achieved, but device area increases and manufacturing cost increases
Solution Approach 1:
The patent combines the first correction circuit and second correction circuit into a single integrated correction device. The correction device receives the detected signal and simultaneously performs both correction operations through integrated circuitry, reducing the total device area while maintaining the functionality of separate correction circuits. This merging approach directly resolves the contradiction by achieving signal correction without the area penalty of separate implementations.
2Reliability
If separate circuits are used for first correction and second correction, then signal distortion correction is achieved, but manufacturing cost increases
Solution Approach 1:
By integrating both correction functions into a single correction device with unified circuitry, the patent reduces the number of discrete components and interconnections required. This integration simplifies the manufacturing process, reduces assembly steps, and lowers overall manufacturing costs while preserving the dual correction functionality needed for signal accuracy.
3Measurement precision
If propagation delay correction is applied, then current signal accuracy is improved, but circuit complexity increases
Solution Approach 1:
The patent integrates propagation delay correction functionality within the unified correction device, combining it with sub-harmonic oscillation correction circuitry. This integration shares common components and signal paths, reducing the overall circuit complexity compared to fully separate correction circuits, while still providing accurate current signal measurement through both correction mechanisms.
Data Source
AI summary
A device and method for controlling a power supply. The method includes: a first correction signal is generated according to a down-slope waveform and a second correction signal is generated according to an up-slope waveform, in a period of the switching element. Therefore, two kinds of corrections can be performed by using an oscillator, while the area of the circuit can be reduced and the cost of the integrated circuit can be decreased.