Floating Ground Signal Communication via Potential Difference Compensation
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Solution Overview
Problem
Communication of control signals between circuits with floating grounds poses challenges due to varying ground potentials, requiring innovative methods to convey information without galvanic isolation, which is typically used in existing technologies.
Innovation Solution
The solution involves a circuit design where a first circuit with a first ground determines the value of a control signal relative to a second ground, using a difference between the two ground potentials, without direct galvanic isolation, allowing for the communication of analog signals, such as dimming control signals, between circuits with floating grounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If galvanic isolation is used to communicate control signals between circuits with floating grounds, then signal communication reliability is improved, but device cost and complexity increase
Solution Approach 1:
The patent introduces a ground potential difference measurement mechanism as an intermediary. The first circuit measures the voltage difference between its own ground and the second circuit's ground, and uses this measurement to compensate for ground floating effects during signal communication, eliminating the need for galvanic isolation components
Solution Approach 2:
The patent replaces the mechanical/electrical galvanic isolation system (opto-isolators, transformers) with an electrical measurement and compensation system that uses voltage sensing and mathematical correction to achieve the same signal transmission goal without physical isolation barriers
2Reliability
If galvanic isolation components are used to manage floating ground differences, then signal communication stability is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive, complex galvanic isolation components with inexpensive voltage measurement circuits and computational compensation algorithms, significantly reducing component cost while maintaining signal communication stability through software-based ground potential correction
3Adaptability or versatility
If the first ground floats with respect to the second ground, then circuit design flexibility is improved, but signal measurement precision deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the ground potential difference is continuously measured and used to adjust subsequent signal measurements. The system constantly monitors the voltage offset between grounds and applies real-time compensation to maintain precise signal communication despite floating ground conditions
Solution Approach 2:
The patent dynamically adjusts the reference potential parameter by measuring the actual ground voltage difference and using this information to shift the measurement reference frame, thereby maintaining signal precision regardless of ground floating variations
Data Source
AI summary
An electronic device includes a first circuit having a first ground that receives first and second control signals. A third control signal is produced by a second circuit. The second circuit uses a second ground, and the first ground floats with respect to the second ground. The first circuit determines a value corresponding to a value of a third control signal using a difference between a value of the first control signal and a value of the second control signal, the value of a third control signal being a value relative to the second ground. The first circuit controls a value of an output signal of the first circuit according to the value corresponding to the value of a third control signal.