Synchronization Signal Compensation for Low-Cost Control Accuracy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control devices face increased costs due to the use of high-accuracy oscillators like crystal or ceramic oscillators to maintain communication quality, and existing systems struggle to improve control accuracy of control targets at low cost.
Innovation Solution
A control device that calculates a correction value based on the oscillation frequency of a synchronization signal to correct command values, using an inexpensive oscillator to maintain high control accuracy without requiring high-accuracy oscillators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crystal oscillator or ceramic oscillator is mounted on each transceiver to reduce oscillation frequency difference, then communication quality is improved, but system cost increases
Solution Approach 1:
The invention divides the oscillation frequency compensation function into two parts: the master device generates the synchronization signal with its oscillation frequency, and the slave device measures this frequency and compensates for deviations. This segmentation allows the expensive high-accuracy oscillator to be used only in the master device, while the slave device uses a lower-cost oscillator with frequency measurement and compensation capabilities.
Solution Approach 2:
The slave device measures the actual oscillation frequency of the synchronization signal and calculates a compensation value based on the frequency deviation from the expected value. This compensation value is then applied to correct the timing of received commands, effectively compensating for oscillation frequency differences without requiring expensive high-accuracy oscillators in all devices.
2Reliability
If a voltage-controlled oscillator with adjustment circuit is used in the slave device to adjust oscillation frequency, then communication quality is improved, but device complexity and cost increase
Solution Approach 1:
The slave device measures the oscillation frequency of the synchronization signal received from the master device and uses this feedback information to calculate a compensation value. This compensation value is then applied to adjust the timing of command execution, creating a closed-loop feedback system that maintains accurate control without requiring complex voltage-controlled oscillators or external adjustment circuits.
3Ease of manufacture
If an inexpensive LC or RC oscillation circuit is used without frequency adjustment capability, then cost is reduced, but control accuracy deteriorates
Solution Approach 1:
The slave device autonomously measures the oscillation frequency of the received synchronization signal, calculates the frequency deviation, and applies compensation to its command timing. This self-service approach allows the use of inexpensive fixed-frequency LC or RC oscillation circuits while maintaining control accuracy through software-based frequency compensation, eliminating the need for expensive adjustable oscillators or external correction circuits.
Data Source
AI summary
A control device communicates with a command device based on a synchronization signal generated by the command device. The control device stores specified value information specifying an oscillation frequency of the synchronization signal and generates a clock signal having a predetermined oscillation frequency. The control devices acquires a measured value obtained by measuring the oscillation frequency of the synchronization signal transmitted from the command device based on the clock signal. The control devices calculates, based on the specified value information and the measured value, a correction value for correcting command value information transmitted from the command device and acquires the command value information indicating a command value for the control target. The control devices calculates a corrected command value by correcting a cycle of the command value information using the correction value and controls the driving of the control target based on the corrected command value.