Capacitive Isolation Circuit for Transient-Immune Signal Transfer
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Solution Overview
Problem
The challenge lies in effectively transferring information and power between high voltage and low voltage circuits while preventing disruptions from transients and anomalies, which can corrupt the data transfer and potentially damage circuitry.
Innovation Solution
The system employs capacitive isolation elements to pass AC signals between circuits while maintaining a floating ground, using a supply voltage generation device to convert AC signals into DC voltage, and includes clock regeneration and filtering to preserve common-mode transient immunity and attenuate transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct electrical connection is used between high voltage and low voltage circuits, then power and information transfer is efficient, but transients and anomalies can disrupt and corrupt the information transfer
Solution Approach 1:
The patent introduces isolation elements (capacitors) as intermediary components between high voltage and low voltage circuits. These capacitors block direct DC connection while allowing AC signal transmission, thereby mediating the interaction between circuits operating at different voltage levels and preventing transient propagation while maintaining information transfer capability.
Solution Approach 2:
The patent segments the electrical connection into multiple functional parts: isolation elements for voltage separation, AC coupling capacitors for signal transmission, and DC blocking mechanisms. This segmentation allows each component to perform its specific function independently, ensuring reliable information transfer while protecting against voltage transients.
2Reliability
If isolation elements are used to protect circuits from transients, then information transfer reliability improves, but the system complexity increases
Solution Approach 1:
The isolation elements and capacitors in the patent serve multiple functions simultaneously: they provide voltage isolation, block transient propagation, enable AC signal transmission, and prevent DC voltage interference. This multi-functionality reduces the need for separate protective components, thereby limiting the increase in system complexity while maintaining high reliability.
3Object-affected harmful factors
If AC coupling is used to pass signals between circuits, then transient immunity is improved, but DC voltage generation for powering the second circuit becomes necessary
Solution Approach 1:
The patent implements a self-service mechanism where the AC coupling capacitors not only provide signal transmission and transient protection but also serve as the energy source for generating DC voltage to power the second circuit. The supply voltage generation device converts the AC signals already present in the system into the required DC voltage, eliminating the need for separate power supply components and reducing overall system complexity.
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 approach ensures reliable and uninterrupted information transfer and power delivery between high and low voltage circuits, maintaining signal integrity even under transient conditions, thereby preventing errors and damage to circuitry.
Implementation Method 1
A first isolation element electrically isolates a first circuit from a second circuit and passes AC signals between the first circuit and the second circuit. A second isolation element electrically isolates the first circuit from the second circuit and passes AC signals between the first circuit and the second circuit.
Implementation Method 2
A supply voltage generation device converts AC signals from the first isolation element and the second isolation element into at least one DC voltage to power the second circuit.
Implementation Method 3
A ground of the second circuit electrically floats relative to a ground of the first circuit, so that a digital signal is able to pass from the second circuit through a third isolation element to the first circuit.
Data Source
AI summary
In described examples, a first isolation element electrically isolates a first circuit from a second circuit and passes AC signals between the first circuit and the second circuit. A second isolation element electrically isolates the first circuit from the second circuit and passes AC signals between the first circuit and the second circuit. A ground of the second circuit electrically floats relative to a ground of the first circuit, so that a digital signal is able to pass from the second circuit through a third isolation element to the first circuit. A supply voltage generation device converts AC signals from the first isolation element and the second isolation element into at least one DC voltage to power the second circuit.