Boosted-Output Inverter Circuit for Wireless Power Transfer
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Solution Overview
Problem
Conventional power converters that convert direct current to boosted-voltage alternating current require multiple stages, leading to reduced operational efficiency due to independent inefficiencies in each stage, increasing power consumption and reducing the power delivered to electronic devices.
Innovation Solution
A combined boost converter and inverter configuration, referred to as a boosted-output inverter, which integrates the functionality of a voltage converter and inverter into a single circuit using a primary tank inductor and secondary tank inductor, reducing the number of components, physical size, and manufacturing complexity while enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple independent power conversion stages are used in series, then the power converter can convert direct current to boosted-voltage alternating current, but the operational efficiency is reduced due to independent inefficiencies in each stage
Solution Approach 1:
The patent combines the boost converter and inverter into a single integrated circuit stage, eliminating the need for separate sequential stages. This merging of functions reduces the number of components and interfaces, thereby minimizing cumulative power losses while maintaining the capability to convert DC to boosted-voltage AC.
Solution Approach 2:
The integrated circuit performs multiple functions simultaneously - both voltage boosting and inversion operations are accomplished within a single stage. This multi-functionality eliminates the need for separate dedicated stages for each function, reducing overall system complexity and improving operational efficiency.
2Power
If multiple independent power conversion stages are used in series, then the required voltage conversion can be achieved, but the power consumption increases and power delivered to the electronic device is reduced
Solution Approach 1:
By merging the boost converter and inverter into one integrated stage, the patent eliminates redundant power conversion operations and reduces cumulative power consumption. This single stage delivers more power to the electronic device by avoiding the power losses inherent in multiple sequential stages.
3Ease of manufacture
If a combined boost converter and inverter is used, then the operational efficiency is increased and manufacturing complexity is reduced, but the circuit requires careful design of tank inductors and switching timing
Solution Approach 1:
The patent employs periodic switching of the voltage-controlled switches at a selected frequency and duty cycle to achieve the desired voltage boosting and inversion. This periodic action simplifies the control strategy by using regular, predictable switching patterns rather than complex continuous control, making the design more manageable despite the integrated functionality.
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
The boosted-output inverter achieves reduced conduction and switching losses, increased operational efficiency, and simplified manufacturing and control complexity, enabling efficient conversion of direct current to alternating current with higher voltage without the inefficiencies of multi-stage power conversion techniques.
Implementation Method 1
The primary tank inductor is repeatedly charged and discharged, at a selected frequency and duty cycle, by two voltage-controlled switches
Implementation Method 2
Current discharged from the primary tank inductor during the discharge phase is supplied to a secondary tank inductor. In this manner, the voltage across the secondary tank inductor, during the discharge phase, is boosted with respect to the regulated direct current source.
Data Source
AI summary
A power converter can be implemented with a boosted-output inverter, which integrates the functionality of a voltage converter (e.g., boost converter) and a voltage inverter. In particular, a boosted-output inverter includes a primary tank inductor coupled in series with a secondary tank inductor at a central node. The boosted-output inverter also includes two voltage-controlled switches that respectively define a charging phase and a discharging phase of the primary tank inductor. While the primary tank inductor is charging, the secondary tank inductor is inverted to ground. In this manner, current though the secondary tank inductor alternates at a voltage boosted by the fly-back voltage of the primary tank inductor exhibited when the primary tank inductor transitions from the charging mode to the discharging mode. In many cases, the secondary tank inductor is a transmit coil of a transmitter of a wireless power transfer system.