Bilateral ESD Protection Circuit for HEMT Power Devices
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrostatic protection circuits for power devices with high-electron-mobility transistors (HEMTs) face challenges in providing effective bilateral electrostatic protection while avoiding interference with normal device operation and ensuring narrow design windows to prevent damage from electrostatic discharge (ESD) without increasing electric leakage or reducing switching speed.
Innovation Solution
The proposed electrostatic protection circuit includes a configuration of transistors and resistors connected between the three end points of a power device, allowing bilateral electrostatic protection by providing multiple current paths and using capacitors to manage voltage spikes, ensuring that the protection circuit only activates during ESD events and does not interfere with normal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an electrostatic protection circuit is added to protect the power device from ESD damage, then the reliability of the power device is improved, but the device complexity increases
Solution Approach 1:
The electrostatic protection circuit is integrated with the power device by sharing common terminals (source, gate, drain) and using the same transistor structure. The protection circuit merges with the power device's existing terminals rather than adding separate protection terminals, reducing overall system complexity while maintaining ESD protection functionality.
Solution Approach 2:
The first transistor serves dual functions: it operates as part of the power device during normal operation and activates as an ESD protection path during electrostatic discharge events. The same transistor structure and terminals are used for both power transmission and electrostatic protection, eliminating the need for separate dedicated protection components.
2Reliability
If the electrostatic protection circuit is designed to activate during ESD events, then the protection effectiveness is improved, but the risk of false triggering during normal operation increases
Solution Approach 1:
The protection circuit exploits the extreme difference in voltage parameters between normal operation and ESD events. During normal operation, the voltage across the transistor remains within standard operating ranges. During ESD events, voltages spike to hundreds or thousands of volts, automatically triggering the protection mechanism. This parameter-based triggering ensures protection activation only under genuine ESD conditions without false triggering during normal operation.
3Reliability
If the electrostatic protection circuit provides bilateral protection between source and drain, then the protection coverage is improved, but the circuit complexity increases
Solution Approach 1:
The bilateral protection is achieved through asymmetric transistor configuration where the first transistor's source and drain are strategically positioned to create two distinct protection paths: one from source to gate and another from drain to gate. The asymmetric placement of the transistor relative to the power device terminals enables bidirectional protection without requiring symmetric dual-transistor configurations, thus reducing complexity while maintaining comprehensive protection coverage.
Data Source
AI summary
The present disclosure provides an electrostatic protection circuit and an electronic device. The electrostatic protection circuit is connected to a first end point and a second end point of a power device. The electrostatic protection circuit is configured to allow bilateral electrostatic protection between the first end point and the second end point of the power device. The power device includes a transverse high-electron-mobility transistor (HEMT).