Light Source Driving Device with Switching Current Adjustment Circuit

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Solution Overview

Problem

Conventional light source drivers face issues with increased power consumption, reduced lifespan due to active switching devices bearing voltage stress, and electrolytic capacitor deterioration, which limits the longevity of LED drivers.

Innovation Solution

A light source driving device incorporating a direct voltage source, a first capacitance unit, and a switching current adjustment circuit, where the switching current adjustment circuit bears part of the voltage stress and adjusts the current to prevent overheating, using non-electrolytic capacitors to extend lifespan.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an active switching device bears all voltage stress in a conventional driver, then the light source can be driven, but power consumption increases and life span reduces

Engineering Contradiction:

Improvelife spanVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The voltage stress is segmented and distributed between multiple components: the first capacitance unit, the second capacitance unit, and the light-emitting unit share the voltage stress rather than one component bearing it all. This segmentation reduces the voltage stress on any single component, thereby reducing power consumption and extending life span.

Inventive Principle:

Principle #1Segmentation

2Reliability

If an electrolytic capacitor is used in a conventional driver, then capacitance is provided, but the capacitor deteriorates rapidly after prolonged use

Engineering Contradiction:

Improvelife spanVSAvoidcapacitor lifespan

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent replaces the expensive and long-lasting electrolytic capacitor with a non-electrolytic capacitor that has shorter lifespan but can be easily replaced. This approach is economically viable and extends the overall system lifespan by allowing rapid replacement of the capacitor without requiring expensive components.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the type of capacitor from electrolytic to non-electrolytic, fundamentally altering the capacitor's characteristics. This parameter change eliminates the deterioration issue of electrolytic capacitors and enables the use of capacitors with longer operational lifespans suitable for the driving device.

Inventive Principle:

Principle #35Parameter changes

3Temperature

If constant current is used to drive LED, then overheating is prevented, but voltage stress on switching device increases

Engineering Contradiction:

Improvetemperature controlVSAvoidvoltage stress

Core Design Contradiction:

TemperatureVSStress or pressure

Solution Approach 1:

The voltage stress is segmented and distributed across multiple components including the first capacitance unit, second capacitance unit, and light-emitting unit. This segmentation allows the system to maintain constant current control for temperature prevention while reducing the voltage stress burden on any single switching device.

Inventive Principle:

Principle #1Segmentation

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

This configuration reduces power consumption, increases conversion efficiency, and prolongs the lifespan of the light source driving device by minimizing voltage stress on the switching current adjustment circuit and utilizing non-electrolytic capacitors.

Implementation Method 1

a first capacitance unit, and a switching current adjustment circuit. The direct voltage source is coupled with the light-emitting unit, so as to provide a direct voltage. The first capacitance unit and the light, emitting unit are connected in parallel

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 2

The switching current adjustment unit and the light-emitting unit are connect in series, wherein the switching current adjustment circuit is configured to bear a part of a voltage stress of the direct voltage source and is configured to switch the direct voltage

Methodology Applied

Scientific EffectElectrical Resistance: Electrical Resistance

Data Source

PatentUS8749165B2Light source driving device including a switching current adjustment circuit

Publication Date: 2014.06.10 IND TECH RES INST

AI summary

A light source driving device configured to drive a light-emitting unit is provided. The light source driving device includes a direct voltage source, a first capacitance unit, and a switching current adjustment circuit. The direct voltage source is coupled with the light-emitting unit and supplies a direct voltage. The first capacitance unit and the light-emitting unit are connected in parallel. The switching current adjustment circuit and the light-emitting unit are connected in series. The switching current adjustment circuit is configured to bear a part of a voltage stress of the direct voltage source and is configured to switch the direct voltage.