Voltage Selector Stabilization Against Leakage
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Solution Overview
Problem
Existing voltage selectors become unstable and risk current leakage when input voltages are equal, causing the output terminal to float.
Innovation Solution
A voltage selector with a main select circuit and reference circuit that includes a select unit, auxiliary unit, pull-up, and pull-down mechanisms to stabilize the output voltage by controlling the reference voltage, ensuring it remains close to the higher input voltage even when input voltages are equal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional voltage selector is used to switch between different voltages, then the voltage selection function is achieved, but the output terminal becomes floating and unstable when input voltages are equal, causing current leakage risk
Solution Approach 1:
The patent implements a feedback mechanism where the reference voltage is dynamically adjusted based on the output voltage level. When the output voltage drops below the input voltage by a threshold amount, the pull-down unit activates to reduce the reference voltage, which in turn activates the auxiliary unit to pull up the output voltage through additional electrical paths. This closed-loop feedback ensures the output remains stable and prevents floating conditions that could cause current leakage.
Solution Approach 2:
The patent prepares compensatory electrical paths in advance through the auxiliary unit, which remains dormant during normal operation but can be quickly activated when needed. The reference circuit is also prepared to immediately adjust the reference voltage in response to output voltage deviations, preventing the floating condition from developing into a harmful state before corrective action is taken.
2Reliability
If the voltage selector uses a simple select circuit without auxiliary units, then the device complexity is low, but the output voltage cannot be maintained when input voltages are equal
Solution Approach 1:
The patent introduces a reference voltage as an intermediary element that mediates between the input voltages and the output. The reference voltage serves as a control signal that activates the auxiliary unit when needed. This intermediary approach allows the complex functionality to be achieved through a modular structure where the reference circuit and auxiliary unit work together without requiring complete redesign of the basic select circuit.
Solution Approach 2:
The voltage selector is segmented into distinct functional modules: the main select unit for normal operation, the auxiliary unit for compensation, and the reference circuit for control. This segmentation allows each module to perform its specific function independently, making the overall complex system manageable and maintainable while achieving reliable voltage selection even when input voltages are equal.
Data Source
AI summary
A voltage selector includes a first input terminal for receiving a first input voltage, a second input terminal for receiving a second input voltage, an output terminal, a main select circuit and a reference circuit. The main select circuit includes a select unit for outputting a higher input voltage as an output voltage to the output terminal, and an auxiliary unit for pulling up the output voltage to the first input voltage according to a reference voltage when the first input voltage equals to the second input voltage. The reference circuit pulls up the reference voltage according to a higher one of the first input voltage and the second input voltage, and pulls down the reference voltage when the first input voltage equals to the second input voltage and the output voltage is lower than the first input voltage by a threshold voltage.