Dual-Mode DC/DC Receiver Control for Low-Voltage Wireless Power
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Solution Overview
Problem
Wireless power receivers face inefficiencies due to limited, variable, and unpredictable power reception, especially during initial stages, and struggle to operate conventional logic circuits without additional voltage sources like batteries, leading to suboptimal conversion efficiency and control.
Innovation Solution
Implementing a dual-mode DC/DC converter system with a simple control module for initial low-voltage operation and a main controller for efficient, adaptive voltage conversion once sufficient power is generated, allowing efficient operation of logic circuits and ancillary systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a single DC/DC converter is used for voltage conversion, then the device complexity is reduced, but the conversion efficiency is insufficient during both initial low-voltage and steady-state high-voltage operation
Solution Approach 1:
The single DC/DC converter is segmented into two separate converters: a first DC/DC converter for initial voltage conversion when voltage is below the threshold, and a second DC/DC converter for efficient voltage conversion when voltage exceeds the threshold. This segmentation allows each converter to be optimized for its specific operating condition, thereby improving overall conversion efficiency without requiring a complex adaptive single converter design.
Solution Approach 2:
The system dynamically switches between the first and second DC/DC converters based on the real-time voltage level detected by the detection circuit. When the voltage exceeds the preset threshold, the system transitions from using the first converter to using the second converter, enabling adaptive optimization of conversion efficiency throughout different operating phases.
2Adaptability or versatility
If conventional logic circuits are operated directly from limited power reception, then additional power sources like batteries are eliminated, but the operation is suboptimal due to insufficient and variable power
Solution Approach 1:
The system performs preliminary voltage conversion using the first DC/DC converter to build up sufficient voltage from the limited and variable power reception before activating the main logic circuits. This preliminary action ensures that when the logic circuits are activated, they receive stable and sufficient power, thereby improving operational reliability without requiring additional battery power sources.
Solution Approach 2:
The first DC/DC converter acts as an intermediary between the limited power reception and the logic circuits, conditioning the power by converting it to an appropriate voltage level. This intermediary component buffers the variability of the received power and provides stable operation conditions for the logic circuits, enhancing both adaptability and reliability.
3Ease of manufacture
If voltage conversion is delayed until sufficient power is received, then initial operation is simplified, but power delivery to client devices is optimized later
Solution Approach 1:
The voltage conversion process is segmented into two phases: initial voltage conversion by the first DC/DC converter to enable basic operation, and subsequent efficient voltage conversion by the second DC/DC converter to optimize power delivery. This segmentation allows the system to achieve both ease of initial operation and high productivity in power delivery without compromise.
Solution Approach 2:
The system employs periodic action by switching between different converter modes based on operational phase. During initial operation, the first converter is active; once sufficient power is established, the system transitions to the second converter for optimized power delivery. This periodic switching ensures both ease of initial operation and high efficiency during steady-state operation.
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 overall power transmission efficiency by enabling efficient operation of logic circuits and ancillary systems, even with low initial voltage, by transitioning to a high-efficiency mode powered by the DC/DC converter output, optimizing power delivery to client devices.
Implementation Method 1
a power converting element adapted to convert the optical beam power into an electrical current
Data Source
AI summary
A two-mode DC/DC converter systems, for use in wireless power transmission receivers, and which allow the use of conventional logic circuits, operating at voltages well over IV, to efficiently drive DC/DC converter circuits even while being powered from the low voltage, even below IV, of a photovoltaic cell output. Two separate control modules may control the DC/DC converter, a first using a simple control for switching the converter, capable of being powered by the low voltages generated by the PV. Once a voltage above about 1.5V is generated at the output of the DC/DC converter, a second, more complex controller can become powered up, and takes control of the voltage conversion process, driving the converter more efficiently, and able to adapt its control function according to logical input instructions and sensor outputs received. The complex controller can operate independently, or in conjunction with the simple controller, to increase efficiency further.