Power Supply Voltage Control via Internal Feedback Switching
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Solution Overview
Problem
Existing power supply systems for display devices have limitations in controlling the range of output voltage, requiring additional external voltage divider circuits to adjust the output voltage range, which can be cumbersome and inefficient.
Innovation Solution
Incorporating a voltage converter circuit, a voltage controller, an internal voltage divider circuit, a switch unit, and a switch controller that compares feedback voltages with a reference voltage to selectively use either the first or second feedback voltage for controlling the output voltage, allowing for dynamic adjustment of the output voltage range without the need for external components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an internal voltage divider circuit is used to control output voltage, then the scope of output voltage is limited, but if an external voltage divider circuit is added to expand the scope, then the device complexity increases
Solution Approach 1:
The patent combines the internal voltage divider circuit with a switch unit that selectively connects different feedback terminals (first feedback terminal receiving output voltage directly, second feedback terminal receiving divided voltage). This merging allows the power supply to achieve multiple output voltage ranges by switching between different feedback paths, eliminating the need for separate external voltage divider circuits while expanding the output voltage control scope.
Solution Approach 2:
The feedback terminal switching mechanism serves multiple functions: it enables both internal voltage regulation and external voltage division operations through a single integrated structure. The switch unit can selectively connect to different feedback terminals, allowing the same power supply circuit to adapt to different output voltage requirements without requiring dedicated external components for each voltage range.
2Adaptability or versatility
If the resistance ratio of the voltage divider circuit is controlled to change output voltage scope, then the output voltage range is adjusted, but the adjustment scope is limited
Solution Approach 1:
The patent implements dynamic switching between different feedback terminals based on operational requirements. The switch unit can dynamically select which feedback terminal to use (first or second), enabling the power supply to adaptively adjust its output voltage scope in real-time according to the connected load requirements, rather than being fixed to a single resistance ratio configuration.
3Adaptability or versatility
If a separate external voltage divider circuit is installed to expand output voltage scope, then the voltage control range is improved, but the power supply structure becomes more complex
Solution Approach 1:
The patent embeds the feedback terminal switching functionality within the existing power supply structure. The switch unit is integrated into the feedback path of the power supply, with the first feedback terminal receiving voltage directly from the output and the second feedback terminal receiving voltage through the internal voltage divider circuit. This nested arrangement allows multiple voltage control functions to be contained within a single integrated power supply unit.
Data Source
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Figure 3A~3C
AI summary
A power supply includes a voltage converter circuit which converts an input voltage into an output voltage and outputs the output voltage, a voltage controller which controls the voltage converter circuit in response to a first feedback voltage or a second feedback voltage, a feedback terminal which supplies the first feedback voltage, an internal voltage divider circuit which supplies the second feedback voltage, and a switch unit which transfers the first feedback voltage or the second feedback voltage to the voltage controller.