Wireless Power Supply Standby Consumption Reduction
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Solution Overview
Problem
Wireless power systems face challenges in minimizing standby power consumption due to continuous mains rectification losses, high performance microprocessor power usage, and the need for periodic power transmission to detect devices, leading to significant energy wastage and environmental impact.
Innovation Solution
The implementation of an ultra-low power wireless power supply system that uses a switch to isolate the mains during standby, employing a sense circuit powered by an energy storage unit to detect inductance changes and only connect the mains when a valid device is present, reducing power consumption by minimizing unnecessary power transmission and rectification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the wireless power system remains in standby mode to detect devices, then device detection capability is maintained, but power consumption increases due to continuous mains rectification and microprocessor operation
Solution Approach 1:
The system implements periodic power transmission pulses during standby mode instead of continuous operation. The controller periodically activates the power transmission circuitry to detect the presence of wireless power receivers, allowing device detection while significantly reducing power consumption during intervals between pulses
Solution Approach 2:
The system extracts and removes the mains power connection during standby mode using a switchable interface. When no device is detected, the mains rectification circuitry is disconnected from the power transmission circuitry, eliminating continuous mains rectification losses and reducing standby power consumption to minimal levels
2Measurement precision
If high power pulses are transmitted to ensure device detection and communication, then reliable device identification is achieved, but energy wastage increases during standby mode
Solution Approach 1:
The system applies partial power transmission during standby by sending low-power detection pulses instead of full-power transmission. These pulses are sufficient to detect device presence and initiate communication but consume minimal energy, avoiding the excessive energy wastage of continuous high-power transmission
Solution Approach 2:
The system performs preliminary device detection using low-power pulses before activating full power transmission. The controller first detects device presence and validates communication capability with minimal power consumption, then only activates full power transmission when a valid device is confirmed, preventing energy wastage on unnecessary high-power transmission
3Speed
If the system maintains continuous power transmission capability to provide quick user feedback, then operational responsiveness is improved, but power consumption during idle periods increases
Solution Approach 1:
The system uses periodic power transmission pulses during standby that are timed to provide quick feedback to users. The pulse frequency and duration are optimized to detect device presence rapidly and provide operational feedback within acceptable timeframes while maintaining minimal power consumption between pulses
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 significantly reduces standby power consumption, minimizing energy wastage and environmental impact by ensuring power is only drawn when a valid device is detected, achieving power savings of up to 30µW in ultra-low power mode.
Implementation Method 1
a primary coil (Lp) and a sense circuit (206) that detects an inductance change of the primary coil (Lp)
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
The present invention provides methods and apparatus for reducing power consumption. One method includes detecting the presence of an object, identifying whether the object is a valid device and restricting power if its not a valid device. Another method includes temporarily applying a low amount of power to the primary unit to detect a load, supplying more power to determine if its a valid secondary device, and restricting power if its not. An apparatus for reducing power consumption includes two power inputs, where the lower power input powers a sense circuit. A switch selectively decouples the higher power input from the primary subcircuit during detection mode and couples the higher power input to the primary subcircuit during power supply mode.