Operating Current Modifying Device for Optical Disk Drives
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Solution Overview
Problem
Existing power control modules in optical disk drives fail to precisely control output power across varying temperatures due to disregarding threshold currents, leading to inaccuracies in both reading and writing powers, which affects the device's performance and lifespan.
Innovation Solution
An operating current modifying device and method that calculates and adjusts the operating current based on temperature and functional relationships, using a threshold current modifying module, power modifying module, current compensating module, and power control module to ensure precise output power control by accounting for threshold currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a prior power control method is used that calculates operating current based on scale relationship between power values, then the control structure is simple, but the output power control precision deteriorates due to disregarding threshold currents
Solution Approach 1:
The patent segments the operating current into two distinct components: threshold current (It) and effective current (Ie). The threshold current compensating module separately calculates and compensates for the threshold current component based on temperature, while the power control module controls the effective current. This segmentation allows precise control of output power by addressing each current component independently, resolving the contradiction between simple control structure and precise power control.
Solution Approach 2:
The patent introduces a threshold current compensating module as an intermediary component that specifically handles the threshold current compensation function. This module receives temperature information, calculates the threshold current based on stored functional relationships, and provides separate compensation before the current reaches the power generating element. This intermediary structure enables precise power control without complicating the overall control architecture.
2Device complexity
If threshold current compensation is not implemented, then the control module is simpler, but the accuracy of operating current calculation deteriorates at different temperatures
Solution Approach 1:
The patent implements preliminary action by pre-storing multiple sets of threshold current data corresponding to different temperatures in the threshold current compensating module. Before power control operation, the system selects the appropriate threshold current data based on detected temperature, and the threshold current compensating module pre-calculates and compensates for the threshold current component. This preliminary preparation ensures accurate operating current calculation at any temperature without adding complex real-time computation to the control module.
Solution Approach 2:
The patent applies parameter changes by adjusting the threshold current parameter based on temperature variations. The threshold current compensating module changes the threshold current parameter according to the detected temperature and stored functional relationships, ensuring that the operating current calculation remains accurate across different temperature conditions. This parameter adaptation resolves the contradiction between simple control module design and accurate current calculation.
3Ease of operation
If operating current is not adjusted for temperature variations, then the control operation is simpler, but the output power control accuracy deteriorates across different temperatures
Solution Approach 1:
The patent implements feedback by detecting the temperature of the power generating element and using this information to adjust the threshold current compensation. The threshold current compensating module continuously receives temperature feedback, selects appropriate threshold current data from stored sets, and adjusts the compensation accordingly. This feedback mechanism maintains accurate output power control across temperature variations while keeping the control operation simple through automated temperature-based adjustment.
Solution Approach 2:
The patent changes the threshold current parameter based on temperature feedback to maintain accurate output power control. The threshold current compensating module automatically adjusts the threshold current parameter according to detected temperature conditions, eliminating the need for manual control adjustments. This automated parameter change resolves the contradiction between simple control operation and accurate power control across temperatures.
Data Source
AI summary
An operating current modifying device is provided for a power generating element. The power generating element generates an output power when the operating current is larger than a threshold current in the power generating element. A functional relationship is between the threshold current and the temperature of the electrical device. The operating current modifying device includes a threshold current modifying module, a power modifying module, a current compensating module, and a power control module. The threshold current modifying module receives a temperature signal from the power generating element to output a threshold current modifying signal according to the temperature signal and the functional relationship. The power modifying module receives a power feedback signal from the power generating element and a target power signal to output an operating current modifying signal. The current compensating module receives the threshold current modifying signal and the operating current modifying signal to distribute the operating current modifying signal into an operating current compensating signal and a threshold current compensating signal. The power control module receives the operating current compensating signal and the threshold current compensating signal to adjust the operating current.