Projector Current Measurement Feedback Control
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Solution Overview
Problem
Conventional projectors face reduced luminance and inefficient power utilization due to voltage drops in long power supply lines, leading to excessive current restrictions and unnecessary output control, especially when used outdoors.
Innovation Solution
A projector with a current measurement unit and controller that compares measured current values with user-input or stored limit values, allowing for precise power output control to the light source, thereby optimizing power utilization and reducing current margins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If output control is performed based on calculated or experimental current values with margin, then safety is improved, but power utilization efficiency deteriorates
Solution Approach 1:
The patent implements feedback control by measuring the actual input current with a current measurement unit and using this real data to control light source output. The controller continuously monitors the measured current value and adjusts the light source power accordingly, creating a closed-loop system that replaces open-loop estimation with accurate feedback-based control, thereby eliminating unnecessary power reduction while maintaining safety margins.
2Reliability
If current restriction is performed to account for voltage drop in long power supply lines, then reliability is improved, but luminance output deteriorates
Solution Approach 1:
The system uses real-time current measurement feedback to dynamically adjust light source output. By measuring the actual current drawn from the power supply and comparing it against the maximum allowable current, the controller optimizes luminance output without unnecessary restrictions. This eliminates the problem of excessive current limitation that occurred with voltage-drop-based estimation methods.
3Reliability
If margin is secured for current variation, then reliability is improved, but power output deteriorates
Solution Approach 1:
The patent replaces margin-based current estimation with actual current measurement feedback. The controller uses the measured current value to determine the maximum power that can be supplied to the light source, eliminating the need to secure unnecessary margins. This feedback mechanism allows the system to operate at maximum safe power output without risking current overload, thereby resolving the contradiction between reliability and power output.
Data Source
AI summary
Provided is a projector configured to modulate light from a light source unit and project image light, the projector including: a current measurement unit that measures a current supplied from a power supply, the current including at least a current supplied to the light source unit of the projector; and a controller that compares a measured current value measured by the current measurement unit with limit value information determined by user input or based on data stored in advance, and controls power output to the light source unit in accordance with a comparison result.