Power Supply Circuit Voltage Selection Transistor Gate Control
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Solution Overview
Problem
Conventional power supply management circuits for mobile electronic devices are complex and large, leading to increased size and undesirable voltage drops when generating internal power supply voltage from multiple power sources.
Innovation Solution
A power supply circuit that uses a combination of transistors and supply units to efficiently generate internal power supply voltage by selecting the maximum available voltage from multiple power sources, preventing voltage drops and simplifying circuitry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage comparator circuit and selection circuit are used to manage power supply, then the power supply voltage can be selected and maintained, but the circuit configuration becomes complicated and the circuit scale increases
Solution Approach 1:
The patent extracts the voltage comparison and selection functions from separate comparator and selection circuits, and integrates them into the transistor gate control mechanism. The gate voltages applied to the transistors inherently perform the comparison and selection of power supply sources, eliminating the need for dedicated comparator and selection circuit blocks while maintaining the power supply management function.
Solution Approach 2:
The patent merges the voltage comparison, selection, and power supply switching functions into a unified transistor-based circuit structure. The transistors serve multiple functions simultaneously: they act as switches for power supply connection, voltage comparators through their gate characteristics, and selection elements based on gate voltage control. This consolidation reduces the overall circuit scale while maintaining functionality.
2Power
If multiple power supplies are used to generate internal power supply voltage, then the available power capacity increases, but voltage drops occur and power supply voltage maintenance becomes difficult
Solution Approach 1:
The patent implements dynamic power supply selection where the transistors automatically switch between different power supply sources based on real-time voltage conditions. The gate voltages are dynamically adjusted to turn on or off specific transistors, enabling the circuit to adaptively select the most appropriate power supply source (first or second power supply) to maintain stable internal power supply voltage without significant drops.
Solution Approach 2:
The patent employs feedback mechanisms where the voltage states of multiple power supplies are continuously monitored and fed back to control the gate voltages of the transistors. This feedback loop enables automatic selection of power supply sources with adequate voltage levels, preventing voltage drops in the internal power supply by switching to alternative sources when needed, thus maintaining reliable power supply voltage.
3Ease of operation
If a conventional power supply management circuit is used, then power supply control functionality is achieved, but the circuit scale increases which is undesirable for mobile electronic devices
Solution Approach 1:
The patent makes the transistor circuit perform multiple functions simultaneously: power supply switching, voltage comparison, selection logic, and power management control. Each transistor serves as a multi-functional element that can connect or disconnect power supplies, compare voltages through its gate characteristics, and execute selection decisions based on gate voltage control. This multi-functionality reduces the number of dedicated circuit components needed, thereby reducing circuit scale while maintaining full power supply control capability for mobile devices.
Data Source
AI summary
A power supply circuit generates the internal power supply voltage intVCC from a first power supply capable of supplying a first power supply voltage V1 and a second power supply capable of supplying a second power supply voltage V2, which is lower than the first power supply voltage V1. A first transistor TR1 is provided between the first power supply and an output node, whereas a second transistor TR2 is provided between the second power supply and the output node. A first supply unit supplies the inverted value of an output voltage of the first power supply or the inverted value of a voltage corresponding to the output voltage of the first power supply, to the gate input of the first transistor TR1. A second supply unit supplies the output voltage of the first power supply or the voltage corresponding to the output voltage of the first power supply, to the gate input of the second transistor TR2.