Ring-shaped LED Lamp Reducing Pin Count via Closed-Loop Series Topology
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Solution Overview
Problem
Conventional LED lamps require a large number of pins for connection, leading to increased costs, complex wiring, and reduced production efficiency.
Innovation Solution
A ring-shaped LED lamp design where LED chips are connected in a closed loop with the minimum number of pins equal to the number of chips, allowing for simplified pin configuration and reduced pin count, enabling efficient production and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional LED lamps use common-anode or common-cathode configuration with three LED chips, then the lamps can provide multiple lighting functions, but at least four pins are required and even six pins are required for power and control
Solution Approach 1:
The patent merges the anode and cathode connections into a unified ring-shaped structure where LED chips are connected in series forming a closed loop. This eliminates the need for separate common anode/cathode connections and reduces the pin count from 4-6 pins to just 2 pins (power and ground), while maintaining the ability to control multiple LED chips.
Solution Approach 2:
The patent segments the LED chips into individual controllable units within the ring structure, where each LED chip can be independently controlled through PWM dimming signals applied to the power pin, allowing different brightness levels and color mixing effects while using minimal pins.
2Ease of operation
If conventional LED lamps require at least four pins for three LED chips, then the lamps can achieve basic functionality, but wiring becomes complex and production efficiency decreases
Solution Approach 1:
By merging all LED chip connections into a single ring-shaped series circuit with only two external pins (power and ground), the patent dramatically simplifies the wiring process. This eliminates complex parallel connection schemes and reduces assembly steps, thereby improving production efficiency while maintaining ease of operation.
3Adaptability or versatility
If conventional LED lamps use multiple pins for power and control, then the lamps can provide precise control over each LED chip, but manufacturing costs increase
Solution Approach 1:
The patent makes the power pin serve multiple functions: it provides power to all LED chips in series and also carries PWM dimming control signals that can independently regulate the brightness of each LED chip. This multi-functionality eliminates the need for separate control pins for each LED chip, reducing pin count and manufacturing cost while maintaining precise control capability.
Data Source
AI summary
A ring-shaped LED lamp, including at least three LED chips and at least three pins partially located within a package body. The LED chips are connected in series and have two terminal ends connected to form a closed loop, and the pins are led out from connections between the LED chips. A lamp string includes at least one group of lamps and electrically conductive wires connected to multiple lamps, and each group of lamps includes a plurality of the above-described ring-shaped lamps. Also provided is a control circuit applicable for the lamp string. The control circuit includes an input device, a microprocessor, an output circuit, and a lamp string interface connected to the output circuit. The microprocessor receives a signal from the input device, and sends an I/O signal or PWM signal to the output circuit to trigger a voltage level change of the lamp string interface.