ABB OS250D03（1SCA022720R7080）Switch Disconnectors

ABB OS250D03（1SCA022720R7080）Switch Disconnectors

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There are generally two types of dead time: control and effective dead time. Control dead time is the time implemented in the control algorithm to achieve the desired effective dead time on the device. The purpose of setting a control dead time is to ensure that the effective dead time will have a positive value. Since control dead time is calculated on the basis of a worst-case analysis, there is an effective dead time that makes up a significant portion of the control dead time. 

Although providing dead time can prevent bridge shoot-through, it also has some adverse effects. To illustrate the effect of dead time, consider the branching of a voltage source inverter, as shown in Figure 2. Assuming that the output current first flows in the direction shown in the figure, the IGBT T1 switches from ON to OFF, while the IGBT T2 switches from OFF to ON after a short dead time. During the effective dead time, both devices are turned off, and the freewheeling diode D2 conducts the output current. 

Applying negative DC-link voltage to the output is desirable here. Consider another case in which T1 switches from OFF to ON, and T2 switches from ON to OFF. With the output current flowing in the same direction, D2 still conducts the current during the dead time. Therefore, the output voltage is also a negative DC-link voltage, which is not desirable here. In conclusion, during the effective dead time, the output voltage is determined by the direction of the output current, but not by the control signal.

ABB OS250D03（1SCA022720R7080） Technical drawing:

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