Overload operating method for t-type 3-level converters

A working method of the T-shaped three-level overload operating system, comprising the following steps:

• S100:
• sending, by the control module, value d of the duty cycle signal to the channel calculating module;
• S200:
• detecting and making a judgment, by the current comparison module, on the output current of the topology, and sending out a judgment result in the form of a level signal;
• S300:
• receiving, by the channel calculating module, value d of the duty cycle signal and the level signal, and calculating multiple groups of modulation waveform comparison count values corresponding to the first device group and the second device group according to the level of the level signal and positive and negative states of the duty cycle signal;
• S400:
• sending, by the pulse width modulation module, each group of modulation waveform comparison count values to the over-load blocking module in the form of a control signal;
• S500:
• sending, by the over-load blocking module, the on-off signals to the first device group and the second device group respectively according to the level signal and the control signal;
• and
• S600:
• converting, by the conversion module, the ambient temperature collected by the temperature collection module into different triangular modulation waveform peak signals, and sending, by the third channel selection unit, different triangular modulation waveform peak signals to the pulse width modulation module according to the level signal to adjust the frequencies of the control signals;
• wherein the first device group comprises a semiconductor device S1 and a semiconductor device S4, and the second device group comprises a semiconductor device S2 and a semiconductor device S4.