LED Lighting Apparatus Base Conducting Layer EMI Shielding
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Solution Overview
Problem
LED lighting apparatuses struggle to meet electromagnetic compatibility standards due to voltage interference and electromagnetic radiation issues when using switch driving techniques, and they are unable to efficiently regulate broad input voltages while maintaining high production efficiency.
Innovation Solution
The LED lighting apparatus incorporates a circuit board with a full-bridge rectification circuit, a π-filter circuit, and a non-isolated switch driving circuit, all common grounded, connected to a base with a conducting layer and insulation layers to reduce electromagnetic interference and efficiently manage high-frequency switch signals, allowing for the placement of a driver on board and regulation of broad input voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switch driving technique is used to place driver on board, then production efficiency is improved, but electromagnetic compatibility standards cannot be met due to voltage interference and electromagnetic radiation
Solution Approach 1:
A metal shielding layer is introduced as an intermediary between the circuit board and the base. This shielding layer acts as a mediator that blocks electromagnetic radiation and voltage interference from the switch driving circuit, allowing the driver to be placed on the circuit board while preventing harmful electromagnetic effects from propagating to other components and appliances.
Solution Approach 2:
The electromagnetic interference problem is extracted and isolated by separating the switch driving circuit from the base structure. The circuit board with the driver is extracted as a separate functional unit, and the metal shielding layer is used to contain the electromagnetic radiation, effectively removing the harmful effects from the overall system while maintaining the production efficiency benefits of on-board driving.
2Adaptability or versatility
If broad input voltage regulation is implemented, then adaptability is improved, but electromagnetic compatibility issues worsen due to high-frequency switch signals
Solution Approach 1:
The metal shielding layer serves as a mediator that allows the broad input voltage regulation function to operate while blocking the harmful electromagnetic radiation generated by high-frequency switch signals. The shielding layer is positioned between the circuit board and the base, enabling voltage adaptation without compromising electromagnetic compatibility.
3Device complexity
If driver is placed on circuit board, then device complexity is reduced, but electromagnetic compatibility standards cannot be met due to voltage interference
Solution Approach 1:
The metal shielding layer is introduced as an intermediary element that enables the driver to be placed directly on the circuit board while preventing voltage interference from affecting other components. The shielding layer blocks the electromagnetic fields generated by the driver, allowing for simplified circuit board integration without compromising electromagnetic compatibility.
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 effectively shields electromagnetic interference, meets electromagnetic compatibility standards, and maintains high-efficient production by conducting high-frequency switch signals to the base, ensuring reduced electromagnetic energy impact on other appliances and improved voltage regulation.
Implementation Method 1
a full-bridge rectification circuit, a π-filter circuit and a non-isolated switch driving circuit electrically connected in sequence
Implementation Method 2
a full-bridge rectification circuit, a π-filter circuit and a non-isolated switch driving circuit electrically connected in sequence
Implementation Method 3
The power driving circuit is electrically connected to the conducting layer. The power ground is connected to the conducting layer via a metal contact pad of the lighting apparatus
Implementation Method 4
The first segment is electronically connected with the circuit board and the second segment extending from the other end of the first segment and connects to the conducting layer of the base
Data Source
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AI summary
A LED lighting apparatus has a circuit board and a base. The base is a hollow structure. The base with lateral wall has a conducting element. The circuit board is in the base and has a LED power driving circuit and a LED source. The LED power driving circuit has a full-bridge rectification. A π-filter circuit and a non-isolated switch driving circuit connected in order. An output terminal of the non-isolated switch driving circuit is connected with the LED source. The full-bridge rectification, the π-filter circuit and the non-isolated switch driving circuit are common grounded to form a power ground. The power ground is electronically connected with the conducting element in order to reduce the interference of an electromagnetic energy generated by the high-frequency switch signal to other appliances.