Power Supply Feedback Response Speed via Capacitor Circuit
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Solution Overview
Problem
Power supply apparatuses using pulse width modulation (PWM) face challenges in controlling gain and bandwidth, leading to unsteady output voltages due to wide load changes, which result in slow feedback response speeds.
Innovation Solution
The power supply apparatus incorporates a PWM signal generating circuit, power conversion circuit, voltage dividing circuit, capacitor circuit, and feedback compensation circuit to rapidly provide feedback signals, utilizing a capacitor circuit to generate a second voltage in response to output voltage changes, thereby increasing feedback response speed and stabilizing the output voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a feedback circuit and PWM controller are used to stabilize output voltage, then the output voltage stability is improved, but the feedback response speed becomes slow due to wide load changes
Solution Approach 1:
The feedback circuit is segmented into two parallel paths: a first feedback circuit for normal load conditions and a second feedback circuit for light load conditions. This segmentation allows each circuit to be optimized for its specific operating range, resolving the contradiction between stability and response speed by providing specialized feedback paths for different load scenarios.
Solution Approach 2:
The system dynamically switches between the first and second feedback circuits based on load conditions. The PWM controller adjusts which feedback circuit is active depending on whether the load is normal or light, enabling the system to adapt its feedback characteristics to maintain both stability and fast response speed across varying operating conditions.
2Adaptability or versatility
If the PWM signal frequency is changed to accommodate wide load changes, then the adaptability to different loads is improved, but the gain and bandwidth control of the feedback circuit becomes difficult
Solution Approach 1:
The feedback circuit is divided into two independent segments with different characteristics. The first feedback circuit handles normal load conditions while the second handles light load conditions, allowing each segment to be independently optimized without interfering with the other, thus simplifying control while maintaining load adaptability.
Solution Approach 2:
The system uses dual feedback paths where each feedback circuit provides appropriate feedback characteristics for its designated load range. This feedback segmentation allows the PWM controller to maintain proper gain and bandwidth control for each operating condition without the complexity of dynamically adjusting a single feedback circuit across all load ranges.
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
This configuration significantly reduces feedback response time delays, allowing for faster compensation and stabilization of output voltages, as demonstrated by a 1398 millisecond reduction in response time compared to using only a voltage dividing circuit.
Implementation Method 1
The capacitor circuit is coupled to the power conversion circuit to receive the output voltage, and configured to generate a second voltage to the node according to the output voltage in response to a voltage change of the output voltage
Data Source
AI summary
A power supply apparatus including a PWM signal generating circuit, a power conversion circuit, a voltage dividing circuit, a capacitor circuit, and a feedback compensation circuit is provided. The PWM signal generating circuit generates and modulates a PWM signal according to a feedback signal. The power conversion circuit converts an input voltage into an output voltage according to the PWM signal. The voltage dividing circuit divides the output voltage and generates a first voltage to a node. The capacitor circuit generates a second voltage to the node according to the output voltage in response to a voltage change of the output voltage. The feedback compensation circuit generates the feedback signal based on the first voltage and a reference voltage before the output voltage is ready. The feedback compensation circuit generates the feedback signal based on the second voltage and the reference voltage after the output voltage is ready.