PMIC Capacitor Switching for Low-Noise PA Voltage Transitions
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Solution Overview
Problem
In mobile terminals, the physical vibration of capacitors due to charging and discharging causes noise in the audible frequency band and increases transition time, affecting signal transmission efficiency.
Innovation Solution
An electronic device with a battery, multiple capacitors, a converter, and switches, where a controller selects and switches the path of each capacitor from a charging path to a discharge path connected to a power amplifier, allowing each capacitor to be charged to different voltages and reducing the amount of charging or discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the capacitance of the capacitor is increased to improve power management efficiency, then the power management efficiency is improved, but the transition time to target voltage increases
Solution Approach 1:
The patent divides a single capacitor into multiple capacitors (first capacitor and second capacitor). Each capacitor can be independently controlled through separate switches, allowing the system to select which capacitor to charge or discharge based on the required target voltage. This segmentation enables faster transition times while maintaining power management efficiency.
Solution Approach 2:
The patent implements dynamic switching between different capacitors based on the target voltage requirements. The controller selectively activates either the first switch or second switch to connect the appropriate capacitor to the PMIC output, enabling adaptive response to varying power demands and reducing transition time.
2Power
If the capacitor is charged or discharged to adjust target voltage, then the power supply to PA is adjusted, but physical vibration of the capacitor occurs causing noise
Solution Approach 1:
By dividing the capacitor into multiple smaller capacitors, the charge and discharge operations are distributed across different components. This reduces the physical vibration and noise generated by any single capacitor during charging/discharging operations while still achieving the required voltage adjustment.
Solution Approach 2:
The patent introduces switches as intermediary components that control the charging and discharging paths of each capacitor. These switches enable precise control over when and how each capacitor is charged or discharged, allowing the system to adjust target voltage while minimizing noise-generating vibrations.
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
This solution reduces noise and transition time, enhancing signal transmission efficiency by limiting capacitor charging or discharging, thereby improving power management in mobile terminals.
Implementation Method 1
a converter configured to receive power from the battery and charge each of the plurality of capacitors to different voltages based on the power
Implementation Method 2
a plurality of switches configured to switch a first path and a second path of each of the plurality of capacitors
Data Source
AI summary
An electronic device includes a battery, a plurality of capacitors, a converter that receives power from the battery and charges each of the plurality of capacitors to different voltages based on the power, a plurality of switches that switch a first path and a second path of each of the plurality of capacitors, and a controller. The controller selects a first switch among the plurality of switches based on a received signal, and controls the first switch such that a path of a capacitor connected to the first switch is switched from the first path to the second path, and the first path is a path which electrically connects each of the plurality of capacitors to the converter, the second path is a path which electrically connects each of the plurality of capacitors and a power amplifier (PA).