Adiabatic Wireless Power Transfer Circuit for Low Energy Loss
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Solution Overview
Problem
The existing wireless power transfer (WPT) systems with adiabatic circuits face energy loss due to AC-DC power conversion, which limits their application and efficiency, especially when using conventional static CMOS circuits that require additional power-consuming components like current rectifying and voltage regulating circuits.
Innovation Solution
The WPT system incorporates an adiabatic circuit operating at AC power, where the power supply side directly provides the required power wirelessly to the adiabatic circuit, reducing energy loss by eliminating the need for AC-DC conversion and utilizing a switching circuit to control power distribution between different circuit blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional static CMOS circuit is employed in the WPT system, then the system can operate with DC power, but additional power-consuming components (current rectifying circuit, voltage regulating circuit, voltage boosting circuit) are required which lead to additional power consumption
Solution Approach 1:
The patent extracts and removes the AC-DC power conversion components (current rectifying circuit, voltage regulating circuit, voltage boosting circuit) from the WPT system by directly supplying AC power to the adiabatic circuit, thereby eliminating the additional power consumption associated with these components while maintaining system functionality
Solution Approach 2:
The patent changes the power supply parameter from DC to AC, enabling the adiabatic circuit to operate directly with AC power received wirelessly. This parameter change eliminates the need for power conversion circuits and reduces overall power consumption of the system
2Reliability
If AC-DC power conversion is performed in the WPT system, then DC power can be provided to CMOS circuits, but energy loss occurs during the power conversion process
Solution Approach 1:
The patent removes the AC-DC power conversion stage from the system by directly supplying AC power to the adiabatic circuit, thereby eliminating the energy loss that occurs during rectification and voltage regulation while still providing compatible power supply for the circuit operation
Solution Approach 2:
Instead of converting AC power to DC power through power conversion circuits, the patent inverts the approach by designing the adiabatic circuit to operate directly with AC power, thereby eliminating the energy loss associated with the conventional AC-DC conversion process
3Loss of energy
If adiabatic circuit operates at AC power, then energy loss from power conversion is reduced, but the circuit requires continuous power supply to maintain operation
Solution Approach 1:
The patent employs periodic action by implementing a duty cycle-based power supply strategy where the power supply side alternates between working period (charging) and waiting period (discharging). During the working period, the adiabatic circuit is charged wirelessly; during the waiting period, it operates using stored energy. This periodic operation reduces energy loss while extending the effective operating time through energy recycling
Solution Approach 2:
The patent recovers and reuses energy by implementing a duty cycle mechanism where energy stored in the adiabatic circuit during the working period is utilized during the waiting period. This energy recovery approach extends the operating time without requiring continuous power input, thereby reducing overall energy loss
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 reduces energy loss and extends the operating time of the WPT system, making it suitable for low-power applications such as implanted medical devices by minimizing heat consumption and power conversion inefficiencies.
Implementation Method 1
A WPT system is capable of generating a magnetic field through an induction coil and transmitting energy without using any conductive wire
Implementation Method 2
the time spent on charging or discharging circuit devices is extended through employing alternating current (AC) power rather than the conventional direct current (DC) power, so as to reduce heat consumption and recycle energy stored in a node capacitor in the circuit
Data Source
AI summary
A wireless power transfer system includes a power supply side and a power reception side. The power supply side is configured to provide wireless power. The power reception side is electrically connected to the power supply side. The power reception side is configured to receive the wireless power and convert the wireless power into power of a required type. The power reception side includes an adiabatic circuit that operates at AC power and a memory circuit that operates at DC power. The adiabatic circuit includes a first circuit and a second circuit. When the first circuit operates during one of a working period and a waiting period, the second circuit operates during the other one of the working period and the waiting period.