Inverter control method, switch tube drive circuit, controller and inverter

Abstract

The present application provides an inverter control method, a switch tube driving circuit, a controller and an inverter. In the process of the inverter commutating from the power diode to the switch tube, the solution is based on different operations of the inverter. The current control switch tube is turned on with different resistance values. Specifically, as the current value of the inverter gradually decreases, the on-resistance of the switch tube gradually increases, thereby reducing the conduction speed of the switch tube, that is, reducing the The commutation speed reduces the current change rate of the power diode during commutation, and finally reduces the reverse stress at both ends of the power diode. Moreover, when the current of the inverter is large, the resistance value of the on-resistance of the switch tube is small, which reduces the turn-on loss of the switch tube and the turn-off loss of the power diode. Therefore, the operating efficiency of the inverter is guaranteed to be higher. high.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an inverter control method, a switch tube driving circuit, a controller and an inverter. Background technique [0002] The working principle of the inverter is to convert direct current into alternating current by controlling semiconductor tubes. In the inverter, a power diode and a switch tube are usually provided, and the power diode is mainly used in a boost circuit or an inverter circuit to provide a commutation loop for the switch tube. If during the commutation process, the speed of the power diode commutating to the switch tube is too fast, the current change rate on the power diode is very large, and the voltage stress of the power diode exceeds the standard, and the voltage stress will be superimposed on the commutation. On the switch tube, the voltage stress and loss of the switch tube increase, especially in the case of small current, the turn-of...

AI Technical Summary

Problems solved by technology

If during the commutation process, the speed of commutation from the power diode to the switch tube is too fast, resulting in a large current change rate on the power diode, which will cause the voltage stress of the power diode to exceed the standard, and the voltage stress will be superimposed on the commutation. On the switch tube, the voltage stress and loss of the switch tube increase. Especially in the case of low current, the turn-off characteristics of the power diode are relatively hard (that is, the turn-off speed is slow). In this case, the voltage stress of the power diode exceeds the standard. serious

[0003] The traditional solution is to use soft recovery diodes. This type of diode has a slow turn-off speed and soft characteristics, so as to reduce the current change rate of the diode. However, the loss of the soft recovery diode is high, which leads to the inverter running Reduced efficiency

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