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实用新型
CN203932987U 具有消隐功能的IGBT短路保护电路 失效 - 权利终止 转让 质押

具有消隐功能的IGBT短路保护电路
摘要：
本实用新型涉及一种具有消隐功能的IGBT短路保护电路，包括：IGBT门极驱动电路；由隔离驱动光耦U2、稳压管D15、超快恢复二极管D13、电阻R13、电阻R14、电容C27等元件连接而成的IGBT短路检测电路；由隔离驱动光耦U2，电阻R24、电容C39、电容C40、场效应管Q7等元件连接而成IGBT短路检测消隐电路。IGBT短路检测单元通过隔离驱动光耦与外围电路配合，形成恒流源电路，在IGBT开通后，检测其集电极和发射极两端压降Vce是否超过电路设定值，来判断IGBT是否发生短路故障。IGBT短路检测消隐电路，当IGBT开通初期，门极驱动电压上升过程中，将短路检测单元旁路，当门极驱动电压上升完成后，消隐功能结束，短路检测单元发挥作用。
摘要（英）：

The utility model relates to an IGBT short circuit protection circuit with a blanking function. The IGBT short circuit protection circuit comprises an IGBT gate drive circuit, an IGBT short circuit detection circuit and an IGBT short circuit detection blanking circuit; the IGBT short circuit detection circuit is formed by connecting an isolation driving optical coupler U2, a voltage-stabilizer tube D15, a super fast recovery diode D13, a resistor R13, a resistor R14, a capacitor C27 and the like; and the IGBT short circuit detection blanking circuit is formed by connecting the isolation driving optical coupler U2, a resistor R24, a capacitor C39, a capacitor C40, a field effect transistor Q7 and the like. An IGBT short circuit detection unit cooperates with a peripheral circuit through the isolation driving optical coupler, and a constant current source circuit is formed; when the IGBT is turned on, whether the pressure drop Vce between the collector electrode and the emitter electrode of the IGBT exceeds a circuit set value is detected, and whether a short circuit fault occurs in the IGBT is judged. In the IGBT short circuit detection blanking circuit, when the IGBT is just turned on and the gate driving voltage is in an increasing process, the short circuit detection unit is bypassed, after the gate driving voltage is increased, the blanking function is finished, and the short circuit detection unit comes into play.

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