IGBT active clamping protection circuit and inverter
By introducing a combination of a positive temperature coefficient resistor circuit and a transient voltage suppression circuit into the IGBT active clamping protection circuit, the problem of IGBT clamping voltage fluctuation at different temperatures is solved, and effective protection of the IGBT at high temperatures is achieved.
CN223391252UActive Publication Date: 2025-09-26HEFEI SUNSHINE POWER TECH CO LTD
0 Cites 0 Cited by
Patent Information
- Application Number
- CN202422695000.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-04
AI Technical Summary
Technical Problem
The clamping voltage of existing IGBT protection circuits fluctuates greatly at different temperatures, and is unable to effectively protect IGBT modules, especially at high temperatures.
Method used
A positive temperature coefficient resistor circuit is introduced in series with a transient voltage suppression circuit in the IGBT active clamping protection circuit. The resistance of the positive temperature coefficient resistor circuit increases with increasing temperature, ensuring that the collector potential is clamped at the target value, thereby protecting the IGBT.
Benefits of technology
It can effectively protect IGBT at any temperature, avoid voltage fluctuations caused by temperature changes, and ensure that the normal operation of IGBT is not affected.
✦ Generated by Eureka AI based on patent content.
Abstract
The utility model relates to the technical field of power electronics, and discloses an IGBT active clamping protection circuit and an inverter. The circuit comprises an IGBT (Insulated Gate Bipolar Translator) tube and an active clamping module, the collector electrode of the IGBT tube is connected with the positive electrode of the direct current bus and is used for controlling the on-off of the inverter circuit. The active clamping module comprises a positive temperature coefficient resistance circuit and a transient voltage suppression circuit; and the positive temperature coefficient resistance circuit is connected in series with the transient voltage suppression circuit, is arranged between the collector electrode and the gate electrode of the IGBT tube, and is used for clamping the potential of the collector electrode to a target value during overcurrent turn-off and short-circuit protection. An active clamping module with a positive temperature coefficient resistance circuit is arranged to protect an IGBT tube during overcurrent and short circuit, and the resistance value of the positive temperature coefficient resistance circuit is increased along with temperature rise, so that the active clamping module clamps the potential of a collector electrode of the IGBT tube to a target value; the IGBT can be protected at any temperature, and meanwhile, normal work of the IGBT cannot be influenced.
Need to check novelty before this filing date? Find Prior Art