Light-Emitting Device Dynamic Voltage Control for Heat Reduction

Solution Overview

Problem

Light-emitting devices experience reduced operational life due to increased heat generation caused by higher input voltages during off-peak times, which affects power efficiency and LED performance.

Innovation Solution

A light-emitting device design incorporating a current source module with transistors and voltage control modules that adjust current and voltage to maintain constant power, using a first voltage control module with a negative voltage-doubler and a second voltage control module with a transistor operated in a linear or saturation region to manage input voltage variations, thereby reducing heat dissipation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the light-emitting device operates with higher input voltage during off-peak time, then the power output increases, but the heat dissipation increases and operational life shortens

Engineering Contradiction:

Improvepower outputVSAvoidheat dissipation

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The patent implements dynamic voltage control by switching between a first voltage control module (providing higher voltage during peak time) and a second voltage control module (providing lower voltage during off-peak time). This dynamic adjustment of operating voltage based on time-of-day conditions allows the device to adapt power consumption and heat generation to external electrical environment, resolving the contradiction between power output and heat dissipation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operating voltage parameter according to time-of-day conditions. During off-peak time, the second voltage control module reduces the voltage applied to the LED, which directly reduces power consumption and heat generation. This parameter change strategy allows the device to maintain acceptable power output while avoiding excessive heat dissipation that would shorten LED operational life.

Inventive Principle:

Principle #35Parameter changes

2Power

If the light-emitting device operates with higher input voltage during off-peak time, then the power output increases, but the operational life shortens

Engineering Contradiction:

Improvepower outputVSAvoidoperational life

Core Design Contradiction:

PowerVSDuration of action of stationary object

Solution Approach 1:

The patent implements dynamic voltage control by switching between a first voltage control module (providing higher voltage during peak time) and a second voltage control module (providing lower voltage during off-peak time). This dynamic adjustment of operating voltage based on time-of-day conditions allows the device to adapt power consumption and heat generation to external electrical environment, resolving the contradiction between power output and heat dissipation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent applies beforehand cushioning by preemptively reducing voltage during off-peak time through the second voltage control module. This preventive measure protects the LED from excessive voltage stress and heat generation that would otherwise occur during off-peak hours, thereby cushioning against operational life reduction before it can happen.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Power

If the voltage applied to the light-emitting device increases during off-peak time, then the power output increases, but the LED operation condition deteriorates

Engineering Contradiction:

Improvepower outputVSAvoidLED operation condition

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The patent implements dynamic voltage control by switching between a first voltage control module (providing higher voltage during peak time) and a second voltage control module (providing lower voltage during off-peak time). This dynamic adjustment of operating voltage based on time-of-day conditions allows the device to adapt power consumption and heat generation to external electrical environment, resolving the contradiction between power output and heat dissipation.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the operating voltage parameter according to time-of-day conditions. During off-peak time, the second voltage control module reduces the voltage applied to the LED, which directly reduces power consumption and heat generation. This parameter change strategy allows the device to maintain acceptable power output while avoiding excessive heat dissipation that would shorten LED operational life.

Inventive Principle:

Principle #35Parameter changes

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution ensures the light-emitting device operates under substantially constant power, reducing excessive heat generation and extending the operational life of LEDs by adjusting current and voltage to counteract the effects of varying input voltages.

Implementation Method 1

a first voltage control module having a negative voltage-doubler

Methodology Applied

Scientific EffectVoltage doubling:

Implementation Method 2

a second transistor operated in a linear region

Methodology Applied

Scientific EffectLinear region operation:

Implementation Method 3

a first transistor operated in a saturation region

Methodology Applied

Scientific EffectSaturation region operation:

Data Source

PatentUS10412801B1Light-emitting device

Publication Date: 2019.09.10 ENNOSTAR CORP

AI summary

A light-emitting device includes a current source module having a first transistor, a first voltage control module providing a negative voltage and a second voltage control module having a second transistor. The second voltage control module is electrically connected to the current source module and the first voltage control module.