Transformer Chip Signal Isolation for Low-Cost Vehicle Gate Driving
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Solution Overview
Problem
Existing signal transmission devices require high-withstand-voltage processes, which increase manufacturing costs and are not suitable for applications in vehicles.
Innovation Solution
A signal transmission device using a transformer chip that isolates a primary circuit system from a secondary circuit system, eliminating the need for high-withstand-voltage processes by using common low-to middle-withstand-voltage processes, and incorporating transformers in a single package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-withstand-voltage processes are used to ensure electrical isolation between primary and secondary circuit systems, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The patent introduces a transformer chip as an intermediary device that provides electrical isolation between primary and secondary circuit systems. The transformer chip includes a primary coil and secondary coil with magnetic coupling, enabling signal transmission while maintaining voltage isolation without requiring high-withstand-voltage semiconductor processes. This mediator approach resolves the contradiction by achieving reliability through magnetic isolation rather than direct electrical isolation.
Solution Approach 2:
The patent replaces high-withstand-voltage semiconductor processes with a transformer-based magnetic coupling system. Instead of relying on specialized high-voltage semiconductor fabrication processes, the invention uses electromagnetic induction through transformer coils to achieve voltage isolation. This substitution eliminates the need for costly high-voltage processes while maintaining the required electrical isolation reliability.
2Productivity
If transformers are integrated in a single package to enable efficient signal transmission, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent combines the primary coil, secondary coil, and magnetic core into a single integrated transformer chip package. This merging of components enables efficient signal transmission by minimizing parasitic inductance and improving magnetic coupling, while the standardized package design manages the complexity through modular integration suitable for vehicle applications.
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
Reduces manufacturing costs and enables efficient signal transmission between isolated circuit systems, suitable for vehicle applications such as power supply and motor driving devices.
Implementation Method 1
a transformer (231, 232) that outputs, while isolating between a primary circuit system (200p) and a secondary circuit system (200s), an input signal fed to a primary coil (231p, 232p) to a secondary coil (231s, 232s)
Data Source
AI summary
A driving circuit includes a first transistor between an application terminal for an on-voltage and the control terminal of a switching device, a second transistor and a constant current circuit in parallel between an application terminal for an off-voltage and the control terminal of the switching device, and a logic circuit configured to control the driving of the first and second transistors and the constant current circuit. The logic circuit includes, as driving phases for the switching device, a first phase where the first transistor is on and the second transistor and the constant current circuit are off, a second phase where the first transistor is off and the second transistor and the constant current circuit are on, and a third phase where the first and second transistors are off and the constant current circuit is on.