Optocoupler SPICE Model with Performance-State Selection Circuits
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Solution Overview
Problem
Conventional optocoupler SPICE models fail to detect circuit differences caused by manufacturing errors during simulation, as they rely on typical parameter values rather than varying performance states.
Innovation Solution
Establishing three performance-state optocoupler SPICE models with distinct parameter sets (maximum, minimum, and typical) and corresponding selection circuits for input and output ends to simulate different performance states, allowing for a comprehensive parameter analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical parameter value is used in the optocoupler SPICE model, then the model is simple and easy to use, but the circuit difference caused by manufacturing error cannot be detected
Solution Approach 1:
The patent segments the optocoupler model into multiple independent SPICE models, each representing a different performance state (maximum, minimum, typical). Each model contains the same basic circuit structure but with different parameter values, allowing the system to detect manufacturing variations without requiring a completely complex redesign of the entire modeling approach.
Solution Approach 2:
The patent introduces dynamic selection mechanisms (switches controlled by test sequences) that allow the system to transition between different performance state models during simulation. This enables the model to adapt its parameter values based on the simulation requirements, providing both simplicity for typical operation and complexity only when needed for manufacturing error detection.
2Measurement precision
If multiple performance-state SPICE models are established to detect manufacturing errors, then the detection capability is improved, but the model establishment process becomes more complex
Solution Approach 1:
The patent achieves improved measurement precision by systematically varying key parameters (current gain, voltage thresholds, response times) across multiple SPICE models to represent different performance states. This parameter change approach allows precise detection of manufacturing errors while maintaining a manageable model establishment process through standardized parameter adjustment procedures.
Solution Approach 2:
The patent performs preliminary actions by pre-establishing multiple SPICE models with different performance states before actual circuit simulation. This preliminary model preparation enables accurate parameter analysis during simulation without adding complexity to the simulation process itself, as the varied models are ready to be selected based on test sequence requirements.
3Adaptability or versatility
If selection circuits are added to connect multiple performance-state models, then the ability to simulate different performance states is improved, but the circuit complexity increases
Solution Approach 1:
The patent introduces selection circuits as intermediary components that connect the multiple performance-state SPICE models to the main circuit under test. These selection circuits, controlled by test sequences, act as mediators that route signals to the appropriate model without requiring direct integration of all models into the main circuit, thereby improving adaptability while limiting the increase in overall circuit complexity.
Solution Approach 2:
The patent employs periodic action through test sequences that periodically select different performance-state models during simulation. This allows the system to simulate various performance states in a structured, repeatable manner, improving versatility while keeping the control logic manageable through systematic selection patterns rather than requiring complex simultaneous management of all models.
Data Source
AI summary
A method for establishing an optocoupler SPICE model includes: establishing at least three performance-state optocoupler SPICE models respectively from optocoupler circuits that correspond to at least three performance states; establishing, according to a maximum performance state, a minimum performance state, and a typical performance state of the at least three performance states that correspond to the at least three performance-state optocoupler SPICE models, three selection circuits for each of an input end and an output end; and correspondingly connecting an input-end first selection circuit, an input-end second selection circuit, an input-end third selection circuit, an output-end first selection circuit, an output-end second selection circuit, and an output-end third selection circuit to two sides of the at least three performance-state optocoupler SPICE models, so as to establish the optocoupler SPICE model.