Current limit control method and current limit control device of three-level inverter
A three-level inverter and current-limiting control technology, applied in the electronic field, can solve problems such as positive and negative busbar mutual irrigation, output voltage waveform difference, single-side busbar is large, etc., to prevent overvoltage, good output waveform, avoid Effects of too frequent movements
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[0051] The present invention will be further explained below with reference to the drawings and embodiments, taking the band-resistance load as an example.
[0052] See figure 1 , The three-level inverter includes at least a bridge arm composed of four switching tubes connected in series, the four switching tubes are the main switching tube Q1 and the auxiliary switching tube Q2 located in the upper bridge arm, and the main switch located in the lower bridge arm Tube Q4 and auxiliary switch tube Q3. See figure 2 In the current-limiting control system of the three-level inverter, the wave-emitting control unit is used to output the direction signal (Dir) whose current voltage is in the positive or negative half cycle, and two complementary PWM signals with dead zone to PWM The control unit is the PWM signal of the main switch tube-PWM1, and the PWM signal of the auxiliary switch tube-PWM2. The PWM control unit generates four PWM signals that change according to a certain logic—P...
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