Multiphase DC-DC Converter Control for TDD Radio Power Efficiency
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Solution Overview
Problem
Conventional power supplies for TDD radios are inefficient over a range of power output, and there is a need for more efficient techniques to enhance the efficiency of voltage converters used in time division duplexing (TDD) radios.
Innovation Solution
A method and apparatus that synchronize the timing of a multiphase DC-DC voltage converter with an external time source, determine TDD frame configurations and reference times, and enable/disable phases of the converter based on the TDD frame structure to optimize power delivery to TDD radios during downlink and uplink subframes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional power supply is used to provide DC power to a TDD radio, then the system can operate continuously, but the power efficiency deteriorates over a range of power output
Solution Approach 1:
The power supply is divided into multiple independent phases (first phase, second phase, third phase, fourth phase), each capable of operating independently. This segmentation allows the system to activate only the necessary number of phases based on current power demands during different TDD subframes, thereby improving power efficiency while maintaining manageable system complexity through modular design
Solution Approach 2:
The power supply system dynamically adjusts the number of active phases based on real-time power requirements. During high-power downlink subframes, more phases are activated; during low-power uplink subframes, fewer phases are activated. This dynamic adaptation resolves the contradiction by optimizing power efficiency without requiring a completely complex reconfigurable architecture
2Loss of energy
If the number of phases in the DC-DC voltage converter is increased to improve power efficiency, then power loss is reduced, but device complexity increases
Solution Approach 1:
The DC-DC voltage converter is segmented into multiple phases with independent control. Each phase can be independently enabled or disabled based on power requirements. This segmentation reduces power loss by allowing optimal phase activation while keeping the overall device complexity manageable through modular, independent phase designs that can be controlled separately
Solution Approach 2:
The system changes the operational parameters of the converter by adjusting the number of active phases based on power demand. During high-demand periods, more phases are activated; during low-demand periods, fewer phases operate. This parameter change approach reduces power loss without permanently increasing device complexity, as the physical structure remains constant while operational configuration varies
3Loss of energy
If phases are dynamically enabled and disabled based on TDD frame structure, then power efficiency is enhanced, but control complexity increases
Solution Approach 1:
The control mechanism uses feedback from the TDD frame structure information to dynamically adjust phase activation. The system monitors the current subframe type (downlink or uplink) and automatically enables or disables appropriate phases accordingly. This feedback-based control enhances power efficiency while managing control complexity through automated, rule-based decision-making rather than complex manual control systems
Solution Approach 2:
The system performs preliminary actions by pre-configuring the phase activation strategy based on the known TDD frame structure. Since the TDD frame pattern is predetermined, the control mechanism can prepare phase activation states in advance of each subframe, reducing the need for complex real-time control decisions and simplifying the overall control mechanism while still achieving dynamic power optimization
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
Enhances power efficiency by adjusting the number of enabled phases of the multiphase DC-DC voltage converter according to the TDD frame structure, reducing power loss and improving overall efficiency compared to single-phase converters.
Implementation Method 1
a multiphase DC-DC voltage converter with a first number of phases to provide efficient power conversion
Data Source
AI summary
Techniques are provided for improving power efficiency of a multiphase direct current (DC)-DC voltage converter configured to provide DC power to a time domain duplexing radio by enabling a number of phases during a downlink subframe and disabling the number of phases on or after cessation of the downlink subframe.