Signal Isolator Time-Multiplexing for Fast Abnormal State Detection
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Solution Overview
Problem
Existing isolators face challenges in detecting abnormal states, such as excessive input, with a delay time that is too long, and require additional circuitry to transmit special signals, which increases circuit area and current consumption.
Innovation Solution
The implementation of a time-direction coding method within the isolator, using a fast feedback processing circuit that alternately transmits normal data and special data, allowing for the detection of abnormal states without dedicated transmission paths, thereby reducing circuit area and current consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If a dedicated transmission path is provided for transmitting abnormal state data, then the detection speed of abnormal states is improved, but the circuit area and current consumption increase
Solution Approach 1:
The patent combines abnormal state data transmission with the existing digital signal transmission path by using time-direction coding. The fast feedback processing circuit encodes abnormal state information into the digital signal stream that is already being transmitted to the secondary circuit, eliminating the need for separate dedicated transmission paths while maintaining fast detection response.
Solution Approach 2:
The digital signal transmission path is made multi-functional by enabling it to carry both normal operational data and abnormal state information. Through time-direction coding, the same transmission path serves dual purposes: transmitting regular digital signals during normal operation and conveying abnormal state alerts when needed, thus avoiding additional circuitry.
2Loss of time
If a dedicated transmission path is provided for transmitting abnormal state data, then the detection speed of abnormal states is improved, but the current consumption increases
Solution Approach 1:
The patent merges abnormal state data transmission into the existing digital signal path, allowing the same transmission infrastructure to handle both normal data and abnormal state alerts. This eliminates the need for additional dedicated transmission paths that would consume extra current, while still achieving fast detection through the time-direction coding mechanism.
Solution Approach 2:
The existing digital transmission path is made universal to handle multiple types of data transmission. By using time-direction coding, the path can efficiently transmit both regular operational data and abnormal state information without requiring separate dedicated circuits, thereby minimizing additional current consumption while maintaining fast response times.
3Measurement precision
If ΔΣ modulation is used to convert analog signal to digital signal, then the quantization noise is pushed to high frequency side, but the detection of abnormal states requires acquiring multiple bits of data which increases delay time
Solution Approach 1:
The patent implements a fast feedback processing circuit that continuously monitors the digital signal output from the ΔΣ ADC and prepares abnormal state detection in advance. By using time-direction coding and continuous monitoring, the system can immediately detect and transmit abnormal state information as soon as it occurs, rather than waiting to accumulate multiple bits of data, thus reducing detection delay while maintaining the benefits of ΔΣ modulation.
Data Source
AI summary
An isolator of embodiments includes a ΔΣ analog-digital converter configured to convert an analog signal into a digital signal of one bit and transmit the digital signal of one bit as normal data, a time direction multiplexing circuit configured to perform time direction multiplexing of alternately performing conversion of the normal data into a digital differential signal and transmission of the digital differential signal, and transmission of a special signal different from the normal data, and an insulated transmission circuit configured to transmit the digital differential signal and the special signal transmitted from the time direction multiplexing circuit via an insulating layer.