Integrated Level-Shifter Driver for High-Voltage Bridge Circuits
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Solution Overview
Problem
Existing bridge circuits for power applications require expensive driver ICs due to high voltage blocking capabilities, especially at voltages above 400 V or 600 V, necessitating a cost-effective solution for high-side and low-side switch synchronization.
Innovation Solution
The integration of a high-side switch, a low-side switch, a first level-shifter, and a second level-shifter within the same semiconductor device, with the level-shifters being three-terminal step-up and step-down configurations, reduces the blocking voltage requirements for driver circuits and integrates level-shifter protection within the semiconductor device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If driver ICs are used with high voltage blocking capability for power applications above 400 V or 600 V, then the reliability of the bridge circuit is improved, but the cost of the driver ICs increases significantly
Solution Approach 1:
The patent merges the level-shifter functionality with the driver circuit by integrating the level-shifter protection circuitry directly into the driver IC structure. This integration allows the driver to handle high voltage applications (400V-600V+) without requiring separate external level-shifter protection components, thereby maintaining reliability while reducing overall system cost and complexity
Solution Approach 2:
The driver circuit is designed with multi-functionality by incorporating built-in level-shifter protection capabilities that can operate across multiple voltage ranges. The driver can function as both a standard driver and an integrated level-shifter protection circuit, eliminating the need for separate high-voltage rated driver ICs and reducing system cost
2Reliability
If separate external level-shifter protection components are used in bridge circuits, then the voltage blocking capability is ensured, but the device complexity and number of components increases
Solution Approach 1:
The patent combines multiple functions (driver operation and level-shifter protection) into a single integrated driver IC. The level-shifter protection circuitry is merged with the driver structure, eliminating the need for separate external protection components and reducing overall device complexity while maintaining voltage blocking capability
Solution Approach 2:
The driver circuit is designed to perform multiple functions: it acts as both the primary driver for the power switch and as an integrated level-shifter protection circuit. This multi-functionality reduces the number of discrete components needed in the bridge circuit configuration
3Ease of operation
If the level-shifters are integrated into driver-ICs, then the voltage difference between low-side and high-side arms is managed, but the driver IC requires high voltage blocking capability which increases cost
Solution Approach 1:
The patent merges the level-shifter and driver functions into a single integrated circuit. The level-shifter is integrated directly into the driver-IC structure with built-in protection circuitry, allowing efficient voltage level management between low-side and high-side arms without requiring separate high-voltage rated driver ICs, thereby reducing cost
Data Source
AI summary
An integrated semiconductor device is provided. According to an embodiment, the integrated semiconductor device includes a semiconductor body having a first surface with a normal direction defining a vertical direction, an opposite surface, a first area including a vertical power field-effect transistor structure, a second area including a three-terminal step-down level-shifter, and a third area including a three-terminal step-up level-shifter. A terminal of the vertical power field-effect transistor structure is electrically connected with one of the three-terminal step-down level-shifter and the three-terminal step-up level-shifter.