Transformer Signal Isolation Circuit Without High-Voltage Process
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Solution Overview
Problem
Existing signal transmission devices require high-withstand-voltage processes, leading to increased manufacturing costs and complexity in isolating primary and secondary circuit systems.
Innovation Solution
A signal transmission device utilizing a transformer chip with spiral coils and a common low- to middle-withstand-voltage process, isolating the primary and secondary circuit systems using transformers sealed in a single package, reducing the need for dedicated high-withstand-voltage processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-withstand-voltage processes are used to isolate primary and secondary circuit systems, then isolation reliability is improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent introduces a transformer chip as an intermediary component to achieve electrical isolation between primary and secondary circuit systems. The transformer chip includes primary and secondary coils wound on a magnetic core, which provides galvanic isolation through magnetic coupling. This intermediary approach maintains high isolation reliability while avoiding the need for complex high-withstand-voltage semiconductor processes, as the isolation function is transferred to a dedicated transformer component that can be integrated into the power conversion circuit.
2Reliability
If high-withstand-voltage processes are used to isolate primary and secondary circuit systems, then isolation reliability is improved, but manufacturing cost increases
Solution Approach 1:
The transformer chip serves as a cost-effective intermediary that provides reliable isolation without requiring expensive high-withstand-voltage semiconductor fabrication processes. By using a magnetic core with primary and secondary coils, the isolation function is achieved through well-established transformer manufacturing techniques, which are more economical than developing and implementing specialized high-voltage semiconductor processes.
Solution Approach 2:
The patent segments the power conversion system into distinct functional modules: a controller chip for control logic, a transformer chip for power conversion and isolation, and separate primary/secondary circuit systems. This segmentation allows each component to be optimized independently, with the transformer chip handling the isolation function using cost-effective manufacturing methods while the controller chip handles control functions using standard low-voltage processes.
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 configuration reduces manufacturing costs and simplifies the process while maintaining effective isolation between circuit systems, suitable for applications in power supply and motor driving devices in vehicles.
Implementation Method 1
signal transmission device that transmits a signal between a primary circuit system and a secondary circuit system while isolating between them... utilizing a transformer chip with spiral coils
Data Source
AI summary
For example, a driving circuit includes a short-circuit detection circuit that detects a short-circuit condition in which an excessive short-circuit current can pass through a switching device, and a controller that forcibly turns off the switching device on detecting a short-circuit condition. When forcibly turning off the switching device, the controller switches an output pulse signal for driving the switching device from a logic level (e.g., high level) corresponding to an on-period to a logic level (e.g., low level) corresponding to an off-period while reducing the slew rate stepwise.