Multi-Channel Voltage Converter Control Circuit for Stable Power Switching
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Solution Overview
Problem
Existing switching mode power supplies face challenges in efficiently switching between input power sources with high accuracy and minimal power loss, especially under heavy load conditions, due to significant voltage drops and output voltage fluctuations when switching between different input voltages.
Innovation Solution
A multi-channel switching control circuit that includes a logic control circuit, reference voltage regulation circuit, feedback control circuit, and channel selection circuit, which generates adjustable reference voltage signals and switching control signals to manage the switching operations, reducing voltage drops by gradually transitioning between input voltages and maintaining output voltage stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If switching is performed between different input power sources in conventional switching mode power supplies, then power source switching capability is achieved, but significant voltage drops and output voltage fluctuations occur
Solution Approach 1:
The control circuit performs preliminary actions by gradually increasing the output voltage through controlled switching stages before fully transitioning to the new input power source. This prevents sudden voltage drops by preparing the system in advance, using multiple switching stages with increasing duty cycles to smoothly transition the output voltage rather than making an abrupt change.
Solution Approach 2:
The system dynamically adjusts the switching duty cycle and output voltage during the power source transition process. The control circuit modifies switching parameters in real-time based on the transition stage, increasing the duty cycle gradually from the first power source to the second power source, thereby maintaining output voltage stability throughout the dynamic switching process.
2Productivity
If conventional switching control is used between input voltages, then switching operation is achieved, but significant power losses occur
Solution Approach 1:
The control circuit maintains continuous useful action by ensuring the output voltage is gradually increased throughout the switching transition rather than being interrupted. By using multiple switching stages with increasing duty cycles, the system maintains continuous power delivery to the load, avoiding power losses that would occur with abrupt switching interruptions.
Solution Approach 2:
The control circuit rushes through the voltage transition by implementing controlled gradual increases in output voltage through staged switching. Rather than allowing slow, lossy transitions or abrupt changes, the system rapidly but controllably progresses through intermediate voltage states, minimizing the time spent in high-loss conditions while maintaining stability.
Data Source
AI summary
A switching control circuit for controlling a multi-channel switching circuit can include: a logic control circuit that receives an external operation signal, and generates an enable signal, a trigger signal, and an order signal; a reference voltage regulation circuit that receives the enable signal, the trigger signal, the order signal, and a plurality of input voltage signals, and generates an adjustable reference voltage signal, where the reference voltage regulation circuit is also configured to select one of the plurality of input voltage signals based on the order signal; a feedback control circuit that receives the reference voltage signal, the plurality of input voltage signals, and the output voltage signal, and generates a feedback control signal; and a channel selection circuit that receives the order signal and the feedback control signal, and generates switching control signals to control switching operations of the multi-channel switching circuit.