AC-Powered LED Bulb Without Driving Power Supply
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Solution Overview
Problem
Traditional DC LED light-emitting devices require a driving power supply to connect to external AC power, leading to high manufacturing costs, reduced service life, and excessive energy consumption.
Innovation Solution
An LED bulb design that eliminates the need for a driving power supply by incorporating a rectifier diode, light-emitting diode, and current limiting resistors, allowing direct connection to AC power, with a simple structure and adaptable to various power supplies and voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a driving power supply is used to connect external AC power supply to DC LED device, then the LED can operate with stable current, but the manufacturing cost increases and service life is reduced
Solution Approach 1:
The patent extracts and removes the driving power supply component from the LED lighting system. By eliminating this complex intermediate device, the invention directly connects AC power to the LED filament through simple series-connected rectifier diodes, thereby reducing device complexity while maintaining operational reliability through the inherent properties of the LED and diode circuit configuration.
Solution Approach 2:
The LED filament structure performs self-rectification and self-current-limiting functions. The series-connected rectifier diodes integrated into the filament automatically convert AC to pulsating DC and limit current based on the LED forward voltage characteristics, eliminating the need for external driving power supplies and reducing overall system complexity.
2Use of energy by moving object
If a driving power supply is used to convert AC to DC for LED operation, then the LED receives stable current, but energy consumption increases
Solution Approach 1:
The patent removes the driving power supply component that consumes energy during AC-to-DC conversion. By using direct AC-powered LED filament with integrated rectifier diodes, the system eliminates the energy losses associated with external power supply circuits, thereby reducing total energy consumption while maintaining adequate LED operation.
3Ease of manufacture
If a driving power supply is installed, then the LED can operate with controlled current, but manufacturing cost increases by 40%-60%
Solution Approach 1:
The patent extracts and eliminates the driving power supply component from the LED lighting system. This removal directly reduces manufacturing cost by 40%-60% while simplifying the overall device structure to just the LED filament with series-connected rectifier diodes, making the product easier and more economical to manufacture.
Solution Approach 2:
The rectifier diodes are merged directly into the LED filament structure, forming an integrated AC-powered LED component. This merging eliminates the need for separate driving power supply units, reducing both manufacturing cost and device complexity while maintaining functional integrity.
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 reduces manufacturing costs by 40%-60%, enhances stability, and allows for flexible LED chip configurations, meeting different power and brightness requirements, while preventing moisture ingress and extending service life.
Implementation Method 1
both ends of the two conductive lines are respectively connected to the connection terminal through the rectifier diode
Implementation Method 2
a light-emitting diode is connected to two conductive lines
Implementation Method 3
the first conducting wire is connected to the lamp cap after connecting the first current limiting resistor
Data Source
AI summary
An LED bulb without driving power supply includes a lamp cap, a bulb shell, a current limiting resistor, a core column, and an LED filament. The two ends of the LED filament are provided with connection terminals, the substrate of the LED filament is provided with two conductive lines, the two ends of the conductive line are respectively connected to the connection terminal through rectifier diodes. The rectifier diodes at both ends of the same conductive line are arranged in the opposite direction, and the rectifier diodes connecting different conductive lines on the same connection terminal are arranged in the opposite direction. The LED bulb can be directly connected to the external alternating current power supply to light the lighting without a driving power supply, which eliminates the cost of installing the driving power supply.