PA Power Supply Switching With Capacitor Isolation Against Leakage
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Solution Overview
Problem
In power supply systems for wireless communication devices with multiple PA modules, a leakage current can occur through a selector switch, affecting the PA modules when different frequency bands are used.
Innovation Solution
A power supply system is designed with a first module including a power amplifier, two power lines, capacitors connected to these lines, and switches that manage the connection states of the power lines and capacitors to reduce leakage current influence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a selector switch is used to supply power from one power supply circuit to multiple PA modules, then the number of power supply devices is reduced, but leakage current affects the PA modules
Solution Approach 1:
The harmful leakage current path is extracted and isolated from the PA modules by introducing separate capacitor circuits. The capacitors are connected to power lines that do not pass through the selector switch, thereby removing the leakage current influence while maintaining the shared power supply structure.
Solution Approach 2:
Capacitors are introduced as intermediary elements to provide an alternative power path. These capacitors are connected to power lines directly from the power supply circuits, bypassing the selector switch, and serve as mediators to supply power to PA modules without exposing them to leakage current.
2Object-affected harmful factors
If multiple power supply circuits are provided for multiple PA modules, then leakage current influence is reduced, but the device size increases
Solution Approach 1:
The power supply system achieves multi-functionality by enabling a single power supply circuit to serve multiple PA modules through the selector switch, while simultaneously providing dedicated capacitor circuits for each PA module. This universal approach reduces leakage current influence without requiring completely separate power supply circuits for each module, thereby controlling device size.
3Adaptability or versatility
If capacitors are connected to power lines through the selector switch, then power supply flexibility is improved, but leakage current affects the PA modules
Solution Approach 1:
The power supply system is segmented into two distinct paths: one path through the selector switch for flexible power supply selection, and another separate path through dedicated capacitor circuits for clean power delivery. This segmentation allows the system to maintain power supply flexibility while isolating the PA modules from leakage current in the capacitor-powered path.
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
The system effectively reduces the impact of leakage currents on PA modules, ensuring good isolation characteristics between power lines and maintaining the initial response performance of the PA modules.
Implementation Method 1
a first capacitor connected at one end to the first power line; a second capacitor connected at one end to the second power line
Implementation Method 2
a first switch which switches between a first connection state in which the first power line is electrically connected to the first module and a second connection state in which the second power line is electrically connected to the first module
Data Source
AI summary
A power supply system includes: a first module including a first power amplifier; a first power line supplying power to the first module; a second power line supplying power to the first module; a first capacitance connected at one end to the first power line; a second capacitance connected at one end to the second power line; a first switch that switches between a state in which the first power line is electrically connected to the first module and a state in which the second power line is electrically connected to the first module; a second switch that can connect the second capacitance to a reference potential when the first power line is connected to the first module; and a third switch that can connect the first capacitance to a reference potential when the second power line is connected to the first module.