Gate Driver Transformer Isolation Segmentation
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Solution Overview
Problem
Current gate drivers for power devices like MOSFETs and IGBTs require dedicated high-withstand-voltage processes, increasing manufacturing costs and complexity, especially in applications such as vehicle-mounted power supply and motor driving devices.
Innovation Solution
A semiconductor integrated circuit device with a signal transmission system that uses a transformer chip to isolate and transmit pulse signals between a primary and secondary circuit system, eliminating the need for high-withstand-voltage processes by employing a common low- to middle-withstand-voltage process, and incorporating a controller chip and driver chip within a single package.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated high-withstand-voltage processes are used for gate drivers, then reliability is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The gate driver is divided into two isolated circuit systems: a primary circuit system (including controller chip and signal generation circuits) and a secondary circuit system (including driver chip and power device driving circuits). These systems are electrically isolated through a transformer, allowing each system to operate at different voltage levels without requiring the entire device to undergo complex high-withstand-voltage processes. The segmentation enables the use of simpler manufacturing processes while maintaining reliability through electrical isolation.
Solution Approach 2:
A transformer is introduced as an intermediary component between the primary and secondary circuit systems to transmit control signals and power. The transformer provides galvanic isolation, allowing voltage transformation and signal transmission without direct electrical connection. This intermediary approach enables the gate driver to achieve high-withstand-voltage capability through the transformer's insulation properties rather than requiring complex high-voltage processing for the entire device.
2Reliability
If dedicated high-withstand-voltage processes are used for gate drivers, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
By segmenting the gate driver into isolated primary and secondary circuit systems, the invention allows different parts of the device to be manufactured using different process requirements. The primary circuit system can be manufactured using standard low-to-middle withstand-voltage processes, reducing manufacturing cost, while the transformer provides the necessary voltage isolation for reliable operation.
Solution Approach 2:
The transformer acts as an intermediary that provides voltage isolation and transformation, enabling the gate driver to achieve high-withstand-voltage reliability without requiring expensive high-withstand-voltage manufacturing processes for the entire device. This approach significantly reduces manufacturing cost while maintaining the required reliability level.
3Ease of manufacture
If transformer isolation is used for signal transmission, then manufacturing cost is reduced, but device complexity increases
Solution Approach 1:
The transformer is designed to perform multiple functions simultaneously: signal transmission, voltage transformation, and galvanic isolation. By consolidating these functions into a single component, the invention reduces overall device complexity compared to using separate components for each function, while maintaining ease of manufacture through standard transformer technology.
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 production process while maintaining effective isolation and signal transmission for power devices, suitable for various vehicle-mounted applications.
Implementation Method 1
a transformer chip to isolate and transmit pulse signals between a primary and secondary circuit system
Data Source
AI summary
A gate driver includes: a gate driving circuit configured to generate a gate driving signal for a power device according to a gate control signal; and a driving capacity switch circuit configured to raise the gate driving capacity of the gate driving circuit when a time-variation signal obtained by passing the gate driving signal in the on-transition period of the power device through a high-pass filter becomes lower than a threshold value.