Multi-Base Power Control for Optical Disk Drive Read/Write Modules
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Solution Overview
Problem
Conventional power control modules for optical disk drives fail to accurately control output power across varying temperatures due to neglecting the threshold current, leading to errors in operating currents and reduced performance and lifespan of the optical pickup module.
Innovation Solution
A power control device and method utilizing a multi-base power approach, which includes a base power selecting module, current compensating module, and current integrating module to compute and adjust operating currents based on temperature and threshold current feedback, ensuring precise output power control by compensating for the threshold current effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional power control module controls operating current based on single base power, then control structure is simple, but output power accuracy deteriorates due to threshold current effect at different temperatures
Solution Approach 1:
The patent divides the power control into multiple base powers (first base power and second base power) corresponding to different temperature ranges. The controller selects appropriate base powers based on temperature conditions, segmenting the control strategy to address threshold current effects at different temperatures, thereby improving output power accuracy without excessive complexity
Solution Approach 2:
The patent dynamically adjusts the base power selection based on temperature conditions. The controller determines whether to use first or second base power according to the detected temperature, making the control system adaptive to thermal changes and maintaining accuracy across varying operating conditions
2Ease of operation
If conventional power control module uses fixed operating current, then control method is simple, but performance and lifespan of optical pickup module deteriorate due to thermal effects
Solution Approach 1:
The patent implements a feedback mechanism where the controller detects temperature and adjusts operating current accordingly. The light-sensing module provides power feedback signals that are converted to voltage signals for comparison with target values, creating a closed-loop control system that maintains reliability while managing complexity
Solution Approach 2:
The patent changes operating parameters (base power selection and operating current adjustment) based on temperature conditions. By switching between first and second base powers and adjusting currents dynamically, the system maintains optimal performance and extends module lifespan without requiring overly complex control methods
3Measurement precision
If power control module increases operating current to compensate for temperature rise, then output power accuracy improves at high temperature, but current control precision deteriorates due to threshold current neglect
Solution Approach 1:
The patent applies preliminary compensation by pre-establishing multiple base powers that account for threshold current effects at different temperatures. Before actual power control, the system selects the appropriate base power based on temperature, preemptively compensating for thermal effects and improving both power accuracy and current control precision
Solution Approach 2:
The patent introduces voltage signals as intermediaries to bridge the comparison between power feedback and target power values. The power feedback signal is converted to a voltage signal that can be compared with the target power voltage signal, enabling precise current control while maintaining output power accuracy across temperature variations
Data Source
AI summary
A power control device of multi base powers is provided for an optical read/write module of an optical disk drive. The optical read/write module generates a power feedback signal and a temperature signal. The power control device includes a base power selecting module, a current compensating module, a current computing module and a current integrating module. The base power selecting module selects one of a first base power signal and a second base power signal to output a base power signal. The current compensating module generates an operating current compensating signal and a threshold compensating signal according to the power feedback signal, the temperature signal, the base power signal and a function relationship between the temperature signal and the threshold current of the optical read/write module. The current computing module receives the operating current compensating signal to compute a first operating current signal, a second operating current signal and a third operating current signal based on the operating current compensating signal according to the base power signal and a reference power signal. The current integrating module receives the threshold current compensating signal, the first operating current signal, the second operating current signal and the third operating current signal to generate a power control signal to drive the optical read/write module.