Projector Power Control Circuit Voltage Detection

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Solution Overview

Problem

Projectors powered by 110V AC current exceed safety standards due to high current consumption, necessitating automatic voltage and current restriction to prevent electrical hazards.

Innovation Solution

A power control circuit that includes a detector to identify AC input voltage levels, a switch to adjust power accordingly, and a laser driver to modify the light source's power based on the detected voltage, reducing power consumption when the voltage is 110V to comply with safety standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Temperature

If the projector is powered by an AC current of 110V, then the projector can operate at lower voltage, but the current consumption exceeds the safety standard of the socket

Engineering Contradiction:

Improvevoltage levelVSAvoidcurrent consumption safety

Core Design Contradiction:

TemperatureVSObject-affected harmful factors

Solution Approach 1:

The patent implements dynamic power adjustment by detecting the AC input voltage level and automatically adjusting the light source power accordingly. When 110V is detected, the system dynamically reduces power consumption to comply with safety standards, transforming a static power supply system into a dynamic adaptive one that responds to voltage conditions

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operating parameters of the light source based on the detected voltage level. By adjusting the power consumption parameter dynamically - maintaining default power at higher voltages and reducing it at 110V - the system adapts to different electrical conditions while ensuring safety compliance

Inventive Principle:

Principle #35Parameter changes

2Illumination intensity

If the brightness of the projector increases, then the image quality improves, but the power consumption increases and may exceed safety standards

Engineering Contradiction:

Improveprojector brightnessVSAvoidpower consumption safety

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent implements parameter changes by adjusting the light source power based on detected voltage conditions. The system maintains optimal brightness when voltage permits, but automatically adjusts power parameters when 110V is detected to comply with safety standards, achieving adaptive brightness control

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs feedback control by using a detector to monitor AC input voltage and using this information to adjust the light source power accordingly. This closed-loop feedback mechanism ensures that brightness and power consumption are continuously optimized based on real-time electrical conditions

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS10816888B1Projector, power control circuit and method for the same

Publication Date: 2020.10.27 QISDA CORP

AI summary

A power control circuit for a projector for controlling a light source of the projector. The power control circuit includes: a detector for detecting an AC input voltage is a first value or a second value; a switch coupled to the detector, conducting or disconnecting of the switch being based on the detector detecting whether the AC input voltage is the first value or the second value, the switch further outputting a first control signal; and a laser driver coupled to the switch and the light source, in response the first control signal from the switch to change power consumption of the light source. When the AC input voltage is the first value, power consumption of the light source is a default value. When the AC input voltage is the second value, power consumption of the light source decreased from the default value.