LED Lighting Device Power Supply Circuit with Voltage Limiter
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Solution Overview
Problem
The high cost of manufacturing household appliances with specific power transformers for each lighting device powered by light-emitting diodes, due to varying electrical parameters, and the risk of damage to regulator circuits from excessive input voltages.
Innovation Solution
A power supply circuit with a limiting circuit between the transformer and regulator, which adjusts the electrical signal to a predetermined value, allowing the same transformer to be used across different lighting devices and protecting the regulator circuit from overvoltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specific power transformer is designed for each lighting device with different electrical parameters, then the lighting device operates reliably, but the manufacturing cost increases
Solution Approach 1:
The patent applies universality by designing a single power transformer that can serve multiple lighting devices with different electrical parameters. The transformer is made universal through the addition of a regulator circuit that adapts the output to match the specific requirements of each lighting device, eliminating the need for multiple specialized transformers.
Solution Approach 2:
The patent uses parameter changes by incorporating a regulator circuit that can dynamically adjust electrical parameters (voltage, current) of the transformer output. This allows the same transformer to provide different electrical characteristics to different lighting devices, resolving the contradiction between reliability and manufacturing cost.
2Productivity
If the electrical signal from the power transformer is not limited, then the transformer operates efficiently, but the regulator circuit may be damaged by excessive voltage
Solution Approach 1:
The patent applies preliminary action by placing a limiting circuit between the power transformer and the regulator circuit. This limiting circuit proactively restricts the electrical signal from the transformer before it reaches the regulator circuit, preventing potential damage while allowing the transformer to operate at full efficiency.
Solution Approach 2:
The patent uses an intermediary approach by introducing a limiting circuit as a mediator component between the power transformer and the regulator circuit. This intermediary element protects the regulator circuit from excessive voltage while not interfering with the transformer's efficient operation, effectively resolving the contradiction.
Data Source
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AI summary
The appliance has a lighting device (1) e.g. halogen lamp, formed by LEDs, and a power supply circuit (2) for powering the lighting device. The supply circuit includes a power supply transformer (3) supplying power to a regulatory circuit (4). The regulatory circuit regulates a supply parameter of the lighting device, where the parameter is based on type and/or number of LEDs. The supply circuit includes a limiter circuit (5) mounted between the transformer and the regulatory circuit so as to limit value of electrical output voltage (VST) of the transformer to a predetermined value.