Power drive tube and overcurrent detection circuit and overcurrent detection method thereof
By introducing high-side and low-side overcurrent detection circuits and a floating power supply into the H-bridge drive circuit, the problems of high power loss, low detection accuracy, and undetectable high-side overcurrent in the existing technology are solved, achieving efficient and low-cost overcurrent detection and protection.
CN115856411BActive Publication Date: 2026-07-07SHANGHAI NAXI MICROELECTRONICS CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI NAXI MICROELECTRONICS CO LTD
- Filing Date
- 2023-01-13
- Publication Date
- 2026-07-07
AI Technical Summary
Technical Problem
The existing overcurrent detection circuit of the H-bridge drive circuit has problems such as high power loss, low detection accuracy, and inability to detect overcurrent in the high-side power transistor.
Method used
It employs overcurrent detection circuits and overcurrent alarm circuits for high-end and low-end power transistors, combined with floating power supply and current mirror technology, to detect the overcurrent status of high-end and low-end power transistors respectively, and prevents false alarms through level conversion and anti-jitter circuits.
Benefits of technology
It improves the accuracy and response speed of overcurrent detection, reduces chip area and cost, enhances robustness, and ensures normal operation under abnormal conditions.
✦ Generated by Eureka AI based on patent content.
Smart Images
Figure CN115856411B_ABST
Abstract
The application discloses a power drive tube and an overcurrent detection circuit and an overcurrent detection method thereof. The overcurrent detection circuit comprises a high-end power tube overcurrent detection circuit, a low-end power tube overcurrent detection circuit and an overcurrent alarm circuit. The high-end power tube overcurrent detection circuit detects whether the high-end power tube overflows and gives an alarm signal. The low-end power tube overcurrent detection circuit detects whether the low-end power tube overflows and gives an alarm signal. The overcurrent alarm circuit processes the alarm signals given by the high-end power tube overcurrent detection circuit and the low-end power tube overcurrent detection circuit to prevent false alarms. Compared with resistance detection, the application can improve detection accuracy. The high-end and low-end power tubes are both subjected to overcurrent detection, so that overcurrent undetectability in some cases can be avoided. The high-end overcurrent detection circuit is provided with a floating power supply, so that compared with directly using high-voltage devices, the area is optimized and the cost is reduced. In addition, the application can simultaneously detect the high-end and low-end power tubes and can quickly respond to overcurrent conditions.
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