Differential Phase Detector for 360-Degree Phase Difference Sensing
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Solution Overview
Problem
Conventional phase detectors can only detect phase differences within a limited range of 180 degrees due to the nature of the DC voltage proportional to cos φ, restricting their detection capability.
Innovation Solution
A phase detector design that includes a phase shift circuit to shift signals, a multiplication circuit to perform multiplications of shifted signals, and a phase difference calculating circuit to calculate phase differences using all combinations of signals, allowing for phase difference calculation beyond 180 degrees.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional phase detector uses a multiplier to detect phase difference, then the detection mechanism is simple, but the detection range is limited to 180 degrees
Solution Approach 1:
The phase detector is divided into multiple functional segments: a multiplier for signal multiplication, a low-pass filter for extracting DC components, and a phase difference calculator for computing the final result. This segmentation allows each component to perform its specific function optimally while collectively achieving extended detection range beyond 180 degrees
Solution Approach 2:
The invention extends the detection from a single DC component dimension to multiple dimensions by utilizing both in-phase (I) and quadrature (Q) channel DC components. By calculating phase difference using both channels, the system achieves 360-degree detection capability, effectively adding a dimensional aspect to the phase measurement
2Adaptability or versatility
If the phase detector is designed to detect phase differences beyond 180 degrees, then the detection range is extended, but the device complexity increases
Solution Approach 1:
The multiplier and low-pass filter are designed to process both in-phase and quadrature signals simultaneously, making these components multi-functional. This universality allows the same hardware structure to handle multiple signal paths, extending detection range without proportionally increasing device complexity
Solution Approach 2:
The low-pass filter acts as an intermediary that extracts DC components from the multiplied signals before they are fed to the phase difference calculator. This intermediary step simplifies the final calculation by providing clean DC values, reducing the complexity of the overall system while enabling extended detection range
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 the calculation of phase differences without the 180-degree detection range limitation, providing a more comprehensive phase detection capability.
Implementation Method 1
a phase shift circuit to phase-shift each of a first positive-phase signal included in a first differential signal and a first negative-phase signal included in the first differential signal, and phase-shift each of a second positive-phase signal included in a second differential signal and a second negative-phase signal included in the second differential signal
Implementation Method 2
a multiplication circuit to perform multiplication of two signals for all combinations of the first positive-phase signal included in the first differential signal and the first negative-phase signal included in the first differential signal with the second positive-phase signal phase-shifted by the phase shift circuit and the second negative-phase signal phase-shifted by the phase shift circuit, output a multiplication signal indicating a result of the multiplication
Implementation Method 3
a phase difference calculating circuit to calculate a phase difference between the first differential signal and the second differential signal using all the multiplication signals output from the multiplication circuit
Data Source
AI summary
A phase detector includes: a phase shift circuit to phase-shift a first positive-phase signal included in a first differential signal and a first negative-phase signal included in the first differential signal, and phase-shift a second positive-phase signal included in a second differential signal and a second negative-phase signal included in the second differential signal; a multiplication circuit to perform multiplication of two signals for all combinations of the first positive-phase signal and the first negative-phase signal with the phase-shifted second positive-phase signal and the phase-shifted second negative-phase signal, and perform multiplication of two signals for all combinations of the phase-shifted first positive-phase signal and the phase-shifted first negative-phase signal with the second positive-phase signal and the second negative-phase signal; and a phase difference calculating circuit to calculate a phase difference between the first differential signal and the second differential signal using multiplication signals of the multiplication circuit.