公开(公告)号：EP3355433A1

公开(公告)日：2018-08-01

申请号：EP16847782.6

申请日：2016-04-21

申请人： Johnson Controls Technology Company ,  Johnson Controls Air Conditioning And Refrigeration Company (Wuxi) Co., Ltd ,  York (Wuxi) Air Conditioning And Refrigeration Co., Ltd.

发明人： MIAO, Yu ,  XIE, Yongquan ,  LI, Chengzhi ,  SHAO, Guobin

IPC分类号： H02H7/20

CPC分类号： H02H7/1257 ,  H02H7/20 ,  H02M7/217 ,  H03K17/0828

摘要： An IGBT short-circuit detection and protection circuit, comprising: a driving unit, the output end thereof outputting a PWM driving signal and being connected to gate ends of a first IGBT (IGBT1) and a second IGBT (IGBT2), so as to simultaneously control the turning ON/OFF of the first IGBT and the second IGBT; a comparing unit, comprising a threshold pin and a detection pin (Vdesat), the threshold pin being connected to a threshold voltage, the detection pin being connected by means of a first diode (D1) and a second diode (D3) to collectors (C) of the first IGBT and the second IGBT, respectively, the detection pin supplying a detection current to the first diode and the second diode, cathodes of the first diode and the second diode being connected to the collectors of the first IGBT and the second IGBT, respectively; when the voltage at the detection pin is higher than the threshold voltage, the driving unit controlling the first IGBT and the second IGBT to be turned off. The IGBT short-circuit detection protection circuit achieves bidirectional short-circuit protection of two IGBTs in inverse series connection, without requiring an additional protection circuit.