AC-Driven Light-Emitting Device Eliminates Transformer
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Solution Overview
Problem
Conventional light bulbs require an AC/DC transformer to convert AC power to DC, leading to current instability and premature transformer damage, resulting in waste due to the inability to replace the transformer without disassembling the bulb.
Innovation Solution
A light-emitting device with a power supply unit and impedance units that allow direct AC input, utilizing light-emitting modules and a diffuser to stabilize current and eliminate the need for a transformer, enabling convenient assembly and disassembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an AC/DC transformer is used to convert AC power to DC for the light-emitting unit, then the light-emitting unit can operate with DC power, but the current stability reduces and the transformer is easily damaged
Solution Approach 1:
The patent removes the AC/DC transformer from the light bulb system entirely. Instead of converting AC to DC through a transformer, the invention uses light-emitting modules that can directly accept AC power input, eliminating the problematic power conversion component and its associated reliability issues.
Solution Approach 2:
The patent replaces the mechanical/electrical power conversion system (transformer) with a direct AC-driven light-emitting system. The light-emitting modules are designed to operate directly from AC power without requiring DC conversion, substituting the complex power conversion mechanism with a simpler direct-drive approach.
2Device complexity
If the globe is connected to the base and cannot be disassembled, then the structure is compact, but the AC/DC transformer cannot be replaced and the entire bulb must be discarded when damaged
Solution Approach 1:
The patent divides the light bulb into separable modules: a base, a carrier holding the light-emitting device, and a globe. These components can be disassembled and reassembled, allowing individual components to be replaced or maintained independently. The light-emitting device is mounted on a carrier that can be removed from the base, enabling easy replacement of the light-emitting unit without discarding the entire bulb.
3Use of energy by moving object
If the AC/DC transformer is included in the light bulb structure, then power conversion is achieved, but the device complexity increases and maintenance becomes difficult
Solution Approach 1:
The patent extracts and removes the AC/DC transformer from the light bulb assembly. The light-emitting modules are designed to operate directly from AC power, eliminating the need for power conversion components and reducing overall device complexity.
4Use of energy by moving object
If the light-emitting unit uses DC power source, then the light-emitting diodes can operate efficiently, but an additional AC/DC transformer is required which increases loss of energy
Solution Approach 1:
The patent replaces the AC-to-DC power conversion system with a direct AC-powered light-emitting system. The light-emitting modules are designed to operate efficiently from AC power without requiring DC conversion, eliminating energy losses associated with power transformation while maintaining lighting efficiency.
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 provides stable illumination, extends the service life of the light bulb, reduces waste, and enhances the softness and efficiency of the light source by eliminating the need for a transformer, while allowing for easy maintenance and cost savings.
Implementation Method 1
Each of the light-emitting modules is in an on-state when the current signal forwardly passes therethrough and each of the light-emitting modules is in an off-state when the current signal is in reverse thereto
Data Source
AI summary
A light-emitting device and a light bulb having the light-emitting device are disclosed. The light-emitting device includes a power supply unit having a first electrode and a second electrode and outputting a current signal, an impedance unit having a first end and a second end; a first light-emitting module forwardly coupled to the first electrode and reversely coupled to the first end; a second light-emitting module forwardly coupled to the second electrode and reversely coupled to the first end; a third light-emitting module reversely coupled to the first electrode and forwardly coupled to the second end; and a fourth light-emitting module reversely coupled to the second electrode and forwardly coupled to the second end.