Wireless Power Receiver Rectifier With Main-Frequency-Free Voltage Control
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Solution Overview
Problem
Existing wireless charging technologies fail to provide continuous voltage regulation due to the need to detect the main frequency of wireless charging, limiting the efficiency of the receive end and preventing higher power transmission.
Innovation Solution
A wireless power receiving circuit with a rectifier circuit containing switching units, controlled by a controller to perform voltage regulation independent of the main frequency, allowing continuous voltage adjustment without additional hardware regulators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If pulse modulation with main frequency detection is used for voltage regulation, then voltage regulation can be implemented, but continuous voltage regulation cannot be supported
Solution Approach 1:
The patent changes the fundamental parameter of voltage regulation from frequency-based (synchronized with main frequency) to duty-cycle-based (independent of main frequency). The controller determines the duty cycle of switching units based on output voltage feedback, allowing continuous adjustment without being constrained by the integer multiple requirement of main frequency detection.
2Ease of operation
If additional voltage regulator hardware is added, then continuous voltage regulation can be achieved, but device complexity increases
Solution Approach 1:
The existing switching units in the rectifier circuit, originally designed for basic voltage regulation, are repurposed to perform continuous voltage regulation through duty cycle control. The controller leverages these existing components' on/off capabilities, making them serve multiple functions: both rectification and continuous voltage adjustment, thereby avoiding additional hardware regulators.
Solution Approach 2:
The system uses its own existing switching units and control circuitry to achieve continuous voltage regulation, rather than relying on external or additional dedicated voltage regulator components. The controller itself determines duty cycles based on output voltage feedback, making the system self-regulating without external intervention.
3Ease of operation
If main frequency detection is required, then voltage regulation can be performed, but the duty cycle cannot be independent of main frequency
Solution Approach 1:
The patent extracts the voltage regulation function from the main frequency detection mechanism. Instead of tying voltage regulation to main frequency cycles, the controller independently determines duty cycles based on output voltage feedback. This separates the regulation control from the wireless charging main frequency, eliminating the dependency and detection requirements.
4Productivity
If wireless charging power is increased, then charging time is reduced, but heat dissipation becomes a limiting factor
Solution Approach 1:
The controller implements feedback control by continuously monitoring the output voltage and adjusting the duty cycle of switching units accordingly. This closed-loop control enables precise voltage regulation during high-power wireless charging, optimizing power transfer efficiency and reducing energy losses that would otherwise manifest as heat, thereby managing thermal issues while maintaining high charging speeds.
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
Enables continuous voltage regulation, enhancing the efficiency of the receive end to support higher power transmission without the need for detecting the main frequency, thus improving charging speed and user experience.
Implementation Method 1
The receiver coil is configured to: receive energy, and output an alternating current
Implementation Method 2
The rectifier circuit is configured to convert the input alternating current into a direct current
Data Source
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AI summary
Embodiments of this application provide a wireless power receiving circuit, including a receiver coil, a matching circuit, a rectifier circuit, a controller, and an output end, where the rectifier circuit includes at least one switching unit. The receiver coil is configured to: receive energy, and output an alternating current. The matching circuit is configured to: perform matching on the alternating current, and transmit the alternating current to an input end of the rectifier circuit. The rectifier circuit is configured to convert the input alternating current into a direct current. The controller is configured to: determine a duty cycle of the at least one switching unit based on an output voltage of the voltage output end, and control turn-on or turn-off of the at least one switching unit based on the duty cycle, to perform voltage regulation on the output voltage, where the duty cycle is irrelevant to a main frequency of the wireless power receiving circuit.