Envelope Tracking Power Supply Dynamic Voltage Selection
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Solution Overview
Problem
Existing envelope tracking power supplies in wireless communication systems face inefficiencies due to the need to switch between battery voltage and boosted voltage, leading to reduced overall efficiency and increased power loss when the supply voltage exceeds the battery voltage.
Innovation Solution
A power supply system that includes a linear amplifier, a switch mode power supply, and a selection circuit with switches to dynamically select between battery voltage and boosted voltage based on the envelope of the input signal, optimizing current supply and reducing power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a switch mode power supply is used to provide boosted voltage for envelope tracking, then the power supply can meet high voltage requirements, but power loss increases and efficiency decreases when supply voltage exceeds battery voltage
Solution Approach 1:
The patent implements dynamic voltage selection by monitoring the envelope signal amplitude and switching between battery voltage mode and boosted voltage mode accordingly. The system dynamically adjusts the power supply configuration based on real-time signal conditions, transitioning from static to adaptive operation to minimize power loss while meeting voltage requirements.
Solution Approach 2:
The system changes the operating parameters of the power supply by adjusting the voltage level based on the envelope signal characteristics. When the envelope amplitude exceeds a threshold, the system switches from battery voltage to boosted voltage, effectively changing the power supply parameter to match the signal requirements and optimize efficiency.
2Reliability
If boosted voltage is continuously supplied to track signal envelope, then amplification performance is maintained, but power consumption increases
Solution Approach 1:
Instead of continuously providing boosted voltage, the system applies boosted voltage only partially - specifically when the envelope signal amplitude exceeds a predetermined threshold. This partial action approach maintains amplification performance during high-signal conditions while avoiding unnecessary power consumption during low-signal conditions when battery voltage suffices.
Solution Approach 2:
The power supply operates in periodic cycles, alternating between battery voltage mode and boosted voltage mode based on the periodic nature of signal envelopes. The system monitors envelope peaks and switches modes accordingly, creating a rhythmic pattern of operation that matches the signal characteristics rather than maintaining a constant state.
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 enhances the efficiency of the envelope tracking power supply by minimizing power loss and maintaining high conversion efficiency, even when the supply voltage approaches or exceeds the battery voltage, thereby improving the overall performance of the power amplifier.
Implementation Method 1
a linear amplifier having an output coupled to a voltage supply node of an amplifier, wherein a power supply node of the linear amplifier is coupled to a first voltage supply node
Implementation Method 2
a switch mode power supply (SMPS) having an output coupled to the voltage supply node of the amplifier, and a circuit having a first switch coupled to the first voltage supply node and a second switch coupled to a second voltage supply node, wherein the power supply node of the SMPS is coupled to the first switch and the second switch
Data Source
AI summary
Certain aspects of the present disclosure provide methods and apparatus for generating an envelope tracking power supply voltage. For example, certain aspects of the present disclosure provide an envelope tracking power supply having a linear amplifier having an output coupled to a power supply node of an amplifier, wherein a power supply node of the linear amplifier is coupled to a first voltage supply node. The envelope tracking power supply may also include a switch mode power supply having an output coupled to the power supply node of the amplifier. Certain aspects also include a circuit having a first switch coupled to the first voltage supply node and a second switch coupled to a second voltage supply node, wherein a power supply node of the switch mode power supply is coupled to the first switch and the second switch.