Bidirectional Wireless Power Transfer with Self-Driven Rectifier
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Solution Overview
Problem
Conventional wireless power transfer systems for remote devices suffer from inefficiencies, including constant power draw when idle, leading to energy waste, and lack of bidirectional power capabilities, which restricts interoperability and increases environmental vulnerability.
Innovation Solution
A wireless power supply system that includes a remote device capable of both transmitting and receiving power wirelessly, featuring a self-driven synchronous rectifier and configurable transceiver circuitry to enter an OFF state when not in use, waking up only upon power reception, and utilizing power-saving circuitry to minimize energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless power supply remains idle awaiting a remote device, then it is ready to provide power, but it draws constant power from its power source leading to energy waste
Solution Approach 1:
The power supply dynamically transitions between idle and active states based on the presence of a remote device. When no device is present, the power supply enters an idle state with minimal power consumption. When a device is detected, it transitions to active state to provide power, thus adapting its operational characteristics to current needs and eliminating constant power draw.
Solution Approach 2:
The power supply uses periodic sensing to detect the presence of remote devices rather than continuously operating. It periodically checks for devices and alternates between idle and active states, performing useful action only when needed while minimizing energy consumption during intervals between device interactions.
2Loss of energy
If wireless power supply is completely shut down to minimize power waste, then energy consumption is reduced, but it cannot respond to remote devices that need power
Solution Approach 1:
The power supply performs preliminary sensing actions to detect the presence of remote devices before fully activating. It uses low-power detection mechanisms to identify when a device is nearby, then activates only when needed, rather than remaining continuously on or being completely off. This preliminary detection ensures reliability while minimizing energy consumption.
3Reliability
If remote devices use connector interfaces for power transfer, then power can be supplied reliably, but the interfaces are prone to mechanical failure and environmental damage
Solution Approach 1:
The system replaces mechanical connector interfaces with wireless electromagnetic field-based power transfer. Instead of physical plugs and sockets that are susceptible to mechanical failure and environmental factors like water exposure, the invention uses inductive coupling between transmitter and receiver coils to transfer power contactlessly, eliminating the harmful effects associated with mechanical interfaces.
4Adaptability or versatility
If remote devices are designed with bidirectional power capability, then interoperability is enhanced, but device complexity increases
Solution Approach 1:
The remote device incorporates universal transceiver circuitry that can function in both transmitting and receiving modes. The same coil and control circuitry used for receiving power can also transmit power to other devices, making the device multi-functional and interoperable without requiring separate dedicated circuits for each function, thus managing complexity while enhancing versatility.
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 system effectively reduces power draw during idle periods and enables bidirectional power transfer, enhancing interoperability and reducing environmental exposure while conserving energy.
Implementation Method 1
wireless power transfer to a remote device may be achieved by energizing a primary such that it inductively couples with a secondary incorporated in the remote device
Implementation Method 2
conventional remote devices include passive rectification circuitry to condition power received in the secondary
Data Source
AI summary
The present invention relates to a wireless power supply system including a remote device capable of both transmitting and receiving power wirelessly. The remote device includes a self-driven synchronous rectifier. The wireless power supply system may also include a wireless power supply configured to enter an OFF state in which no power, or substantially no power, is drawn, and to wake from the OFF state in response to receiving power from a remote device.