Universal LED Driver Integrating Constant-Voltage and Current Dimming

Solution Overview

Problem

Existing LED drivers require separate power supplies for current-type and voltage-type LED loads, leading to increased size, complexity, and cost due to the need for different dimming schemes and circuits.

Innovation Solution

A single LED driving device with a conversion unit, dimming switch circuit, and control unit that can detect the output voltage and current to select between constant-voltage and constant-current dimming modes, integrating both dimming solutions and simplifying the structure and size.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If separate power supplies are used for current-type and voltage-type LED loads, then each load type can have its specialized dimming circuit, but the overall device size and complexity increase

Engineering Contradiction:

Improvecompatibility with different LED load typesVSAvoidstructure complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a universal LED driving device that can work with both current-type and voltage-type LED loads through a single power supply unit. The control unit automatically detects the load type and switches between constant-current mode and constant-voltage mode, eliminating the need for separate specialized power supplies for different LED load types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the functionality of separate constant-current and constant-voltage power supplies into a single integrated device. The power supply unit combines both constant-current output capability and constant-voltage output capability, along with unified dimming control circuits, reducing the overall system complexity while maintaining compatibility with both LED load types.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If separate power supplies are used for current-type and voltage-type LED loads, then each load type can have its specialized dimming circuit, but the device size increases

Engineering Contradiction:

Improvecompatibility with different LED load typesVSAvoiddevice size

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

The patent implements a universal LED driving device that can work with both current-type and voltage-type LED loads through a single power supply unit. The control unit automatically detects the load type and switches between constant-current mode and constant-voltage mode, eliminating the need for separate specialized power supplies for different LED load types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the functionality of separate constant-current and constant-voltage power supplies into a single integrated device. The power supply unit combines both constant-current output capability and constant-voltage output capability, along with unified dimming control circuits, reducing the overall system complexity while maintaining compatibility with both LED load types.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If separate power supplies are used for current-type and voltage-type LED loads, then each load type can have its specialized dimming circuit, but the cost increases

Engineering Contradiction:

Improvecompatibility with different LED load typesVSAvoidmanufacturing cost

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent implements a universal LED driving device that can work with both current-type and voltage-type LED loads through a single power supply unit. The control unit automatically detects the load type and switches between constant-current mode and constant-voltage mode, eliminating the need for separate specialized power supplies for different LED load types.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the functionality of separate constant-current and constant-voltage power supplies into a single integrated device. The power supply unit combines both constant-current output capability and constant-voltage output capability, along with unified dimming control circuits, reducing the overall system complexity while maintaining compatibility with both LED load types.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS9532421B2LED driving device and control method for LED driving device

Publication Date: 2016.12.27 DELTA ELECTRONICS INC(CN)

AI summary

The present disclosure discloses a LED driving device and a control method for the same. The LED driving device includes a conversion unit, a dimming switch circuit and a control unit. The control unit includes a dimming control unit and a conversion control unit. The dimming control unit includes a comparison circuit, a constant-voltage dimming circuit and a constant-current dimming circuit. The comparison circuit compares a first signal that represents an output voltage output from the conversion unit with a reference signal, and outputs a first enabling signal and a second enabling signal. The constant-voltage dimming circuit receives the first enabling signal, and outputs a first driving signal to at least one second switch to perform constant-voltage dimming; and the constant-current dimming circuit receives the second enabling signal, and outputs a current-reference to the conversion control unit to perform constant-current dimming.