DC-DC Converter Mode Control for Voltage Matching and Low EMI
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Solution Overview
Problem
Conventional DC-to-DC voltage converters in wireless charging systems face challenges in achieving a proper matching between input and output voltages across a wide range of power requirements, leading to inefficiencies and increased electromagnetic interference (EMI).
Innovation Solution
The proposed solution involves a voltage converter with a coil and multiple switches, including a modulation signal generator that receives output voltage and coil current detection signals to generate control signals, and an operation mode controller that adjusts the operation mode based on input and output voltages, coil current, and control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output voltage is increased to maximum value to provide maximum power, then the power output is improved, but the standby power consumption increases
Solution Approach 1:
The patent implements dynamic voltage adjustment by switching between different operation modes (first operation mode for maximum power output, second operation mode for reduced standby consumption). The controller dynamically selects the appropriate mode based on system state, allowing the output voltage to be optimized in real-time rather than fixed at maximum value, thus resolving the contradiction between power output and standby consumption.
2Adaptability or versatility
If the output voltage is adjusted between 3V and 20V to satisfy various power requirements, then the adaptability is improved, but the device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by designing a single DC-to-DC voltage converter capable of operating in multiple modes (first operation mode and second operation mode) to provide different output voltages. Instead of requiring separate converters for different voltage ranges, one universal converter handles all power requirements from 3V to 20V through mode switching, thereby improving adaptability while avoiding the complexity of multiple dedicated converters.
3Adaptability or versatility
If a conventional DC-to-DC voltage converter is used to raise or lower input voltage, then the voltage matching is improved, but the conduction losses increase
Solution Approach 1:
The patent reduces conduction losses by changing the operational parameters of the voltage converter through mode switching. In the first operation mode, the converter is optimized for maximum power transfer with parameters suited for high current. In the second operation mode, parameters are adjusted for lower power requirements. This dynamic parameter adjustment allows efficient voltage conversion across different power levels without the continuous high conduction losses associated with conventional fixed-mode converters.
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 approach allows for efficient adjustment of output voltage in response to varying input voltages, reducing conduction losses and minimizing EMI, thereby enhancing the performance and flexibility of DC-to-DC voltage converters in wireless charging systems.
Implementation Method 1
The power transmitter includes a coil that is coupled with another coil of the power receiver. Through the coupling, the power receiver receives an AC voltage from the power transmitter
Data Source
AI summary
Voltage converter and method for converting an input voltage to an output voltage. For example, a voltage converter for converting an input voltage to an output voltage includes: a coil; multiple switches including one or more switches connected to the coil; a modulation signal generator configured to: receive the output voltage and one or more detection signals indicating a magnitude of a coil current flowing through the coil; and generate a first signal and a second signal based at least in part upon the output voltage and the one or more detection signals; and an operation mode controller configured to: receive the input voltage, the output voltage, the first signal, and the second signal; and generate one or more mode signals based at least in part upon the input voltage, the output voltage, the first signal, and the second signal.