Method for the control of two IGBTs in reverse driving connected electrically in series in a half bridge

摘要

Method for the control of two IGBTs in reverse driving connected electrically in series in a half bridge of the present invention refers to a method of control of two igts in reverse driving (T1, T2) connected electrically in series in a half bridge (2) where a DC voltage OPERACION AKL (UG) is present, where the so-called reverse driving IGBTs (T1, T2) have three states of switching.According to the invention, the method comprises the following steps: the configuration of each IGBT (T1, T2) in reverse driving the half bridge (2) to the switching condition, "15" during a stable off state of a control signal target associated (s * ~ t ~); maintenance of a IGBT (Q1,T2) in reverse driving the switching condition "+ 15" after a preset period of time ( 30 t ~ 1 ~) have passed after the control signal target (s * ~ t ~) have changed from off state to a connected state while a current flows from the emitter to the collector; the configuration of a IGBT (Q1,T2) in reverse driving after the preset period of time ( 30 t ~ 1 ~) have expired if a current flow is thus made available to the collector to the emitter; the configuration of each IGBT (Q1,T2) in reverse driving of the half bridge (2) to the switching condition "+ 15V" for a second preset period of time ( 30 t ~ 2 ~) after the control signal target associated (st) have switched from the state switched to the off state; the configuration of the IGBT (Q1,T2) in reverse driving of the half bridge (2) to the switching condition "ov" for a third predetermined time period ( 30 t ~ 3 ~) after the second period of time ( 30 t ~ 2 ~) have passed.This creates a control method for RC IGBTs (T1, T2) electrically connected in series in a half bridge (2) with three states of switching, where the load of reverse recovery is less than a method of conventional control with the electrical voltage in advance and The same.