Wireless Power Transmitter Phase Control Circuit
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Solution Overview
Problem
In wireless power transmitting devices, interference between signals of identical frequency occurs due to the output signals of the signal source and phase shifter deviating from their target phases, leading to attenuated beam power and directional issues.
Innovation Solution
A wireless power transmitting device is designed with multiple transmission circuits and antennas, each equipped with a control circuit, F-PLL, and frequency conversion circuit, where the F-PLL generates signals with set frequencies and phases, and the frequency conversion circuits produce transmission signals by converting these frequencies, ensuring the same frequency but different phases across antennas to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the phased array system uses a local oscillator and multipliers to generate transmission signals, then the frequency of output signals can be different from the transmission signal frequency, but the output signals of the local oscillator and phase shifter may sneak into the transmission signal path and cause interference
Solution Approach 1:
The patent introduces an intermediary frequency conversion step between the local oscillator output and the final transmission signal. The local oscillator generates a signal at frequency f1, which is then converted by a frequency converter to the transmission frequency f2. This intermediary conversion process prevents the original local oscillator signal from sneaking into the transmission path and causing interference, while still achieving the desired frequency transformation.
Solution Approach 2:
The patent changes the frequency parameter of the signal through the frequency conversion circuit. By transforming the signal from frequency f1 to frequency f2, the system ensures that the intermediate signals at frequency f1 do not interfere with the transmission signal at frequency f2, thus resolving the interference problem while maintaining signal integrity.
2Productivity
If the wireless power transmitting device uses multiple transmission circuits with identical frequency signals, then beam forming can be achieved, but interference between signals of the same frequency occurs causing phase deviation
Solution Approach 1:
The patent applies local quality by giving each transmission circuit its own dedicated local oscillator and frequency converter, creating independent signal generation paths. Each circuit operates with locally generated signals rather than sharing a common oscillator, which prevents inter-circuit interference while maintaining the ability to form beams through coordinated phase control of each independent circuit.
Data Source
AI summary
In a wireless power transmitting device, a control circuit outputs a control signal for setting a frequency and a phase of an F-PLL signal generated by an F-PLL, the F-PLL generates the F-PLL signal having the frequency and the phase set by the control signal output from the control circuit, and a frequency conversion circuit generates a transmission signal by converting a frequency of the F-PLL signal generated by the F-PLL.