Dimmable Lighting Apparatus Electrical Isolation
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Solution Overview
Problem
Existing dimmable LED lighting systems lack electrical isolation between the input and load terminals, leading to instability, reliability issues, and safety risks, while additional isolation components increase production costs.
Innovation Solution
A dimmable lighting apparatus with a driving circuit that employs pre-stage grounding for the input sub-circuit and post-stage grounding for the dimming sub-circuit, incorporating a constant current module, dimming module, and filtering units to ensure electrical isolation without additional components, and includes a voltage limiting unit to prevent voltage exceeding safety thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an isolation unit is added to achieve electrical isolation, then safety and reliability are improved, but production cost increases
Solution Approach 1:
The patent introduces a virtual ground as an intermediary between the input terminal and load terminal, creating electrical isolation without requiring physical isolation components. The virtual ground acts as a mediator that separates the high-voltage input side from the low-voltage output side, achieving safety and reliability while avoiding additional production costs
Solution Approach 2:
The patent changes the reference potential parameter by establishing a virtual ground at a different potential level than traditional ground. By setting the virtual ground potential to be lower than the lowest potential in the circuit, the system achieves electrical isolation through parameter transformation rather than adding isolation components
2Device complexity
If traditional grounding is used, then circuit simplicity is maintained, but safety and stability deteriorate due to lack of electrical isolation
Solution Approach 1:
The patent transforms the grounding parameter from traditional single-point ground to a dual-stage virtual ground system. By changing the potential reference parameter and creating a staged grounding architecture, the system achieves electrical isolation while maintaining circuit simplicity and avoiding complex isolation components
Data Source
AI summary
The invention provides a dimmable lighting apparatus, comprising a lamp body, and a driving circuit and a light emitting circuit in the lamp body. The driving circuit is configured to drive the light emitting circuit to emit light, and the driving circuit includes an input sub-circuit coupled to a mains and a dimming sub-circuit coupled to an external dimmer, the input sub-circuit, and the light emitting circuit. In particular, the input sub-circuit is grounded in a pre-stage manner, and the dimming sub-circuit is grounded in a post-stage manner.