Half-Bridge Drive Circuit Integration With Pulse Transformer Isolation
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Solution Overview
Problem
Existing semiconductor drive devices face challenges in achieving high-speed performance, robustness, and downsizing due to the need for physical and electrical insulation between P-side and N-side circuits, which increases size and cost.
Innovation Solution
A semiconductor drive device with a half-bridge drive circuit integrated on a single substrate, using pulse transformers for electrical separation and a high-voltage holding structure to integrate P-side and N-side circuits, eliminating the need for separate drivers and reducing size while maintaining high-speed performance and robustness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical insulation is performed using a pulse transformer between transmission circuit and receiving circuit, then high-speed performance and robustness are improved, but device size and cost increase due to separate drive devices or lead frames
Solution Approach 1:
The patent combines the P-side drive circuit and N-side drive circuit into a single integrated drive device, merging previously separate drive devices or lead frames into one unified structure that reduces overall device size while maintaining electrical insulation between P and N sides
Solution Approach 2:
The patent segments the drive device into distinct P-side and N-side circuits that are electrically insulated from each other using pulse transformers, allowing independent optimization of each side while integrating them into a compact unified structure
2Area of stationary object
If electrical insulation is performed between N side and P side using a high-voltage level shifter, then device size is reduced, but responsiveness deteriorates and parasitic operations may occur
Solution Approach 1:
The patent introduces pulse transformers as intermediary components between the transmission circuit and the P-side/N-side drive circuits. These pulse transformers provide galvanic isolation while maintaining fast signal transmission, acting as mediators that eliminate the need for slow high-voltage level shifters and prevent parasitic operations
3Reliability
If separate drive devices are provided for P side and N side with physical insulation, then robustness is improved, but device complexity and cost increase
Solution Approach 1:
The patent merges separate P-side and N-side drive devices into a single integrated drive device that contains both drive circuits on one lead frame, reducing device complexity and cost while maintaining the robustness benefits of electrical insulation through pulse transformers
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
The solution achieves downsizing, high-speed performance, and robustness by integrating P-side and N-side circuits on a single substrate using pulse transformers and a high-voltage holding structure, addressing the size and cost issues of previous designs.
Implementation Method 1
The signal transmission circuit includes a transmission circuit, a P-side pulse transformer, and an N-side pulse transformer. The P-side pulse transformer transmits the P-side drive signal transmitted from the transmission circuit to the P-side half-bridge drive circuit.
Data Source
AI summary
An object of the present disclosure is to achieve high-speed performance, robustness, and downsizing in a semiconductor drive device including a half-bridge drive circuit. A semiconductor drive device includes: half-bridge drive circuits mounted to a first Si substrate which drives a P-side semiconductor element and an N-side semiconductor element which are totem-pole connected; and signal transmission circuits mounted to a second Si substrate to transmit a drive signal to the half-bridge drive circuits. The P-side half-bridge drive circuit and the N-side half-bridge drive circuit are electrically separated by a high-voltage holding structure on the first Si substrate.