Unipolar spwm no dead zone modulation method for h-bridge cascaded multilevel converter
A technology of cascading multi-level and modulation methods, which is applied in the direction of converting irreversible DC power input into AC power output, can solve the problems of occupying large processor resources, adding dead time, etc., to solve thermal imbalance, The effect of solving the imbalance problem and good thermal stability
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[0046] The topology of a single-phase H-bridge cascaded multilevel converter is as follows: figure 1 As shown, when the number of cascaded submodules is 2, the triangular wave carrier phase angle difference between the submodules is 180 °, according to the unipolar SPWM no dead zone control modulation method based on carrier phase shifting of the present invention, each submodule The PWM drive signal such as image 3 shown. Depend on image 3 It can be seen that the driving signals of the direction arms of each sub-module are consistent. When DirCTL=1, the H-bridge switching device T _1 and T _2 As the direction arm, the H-bridge switching device T _3 and T _4 As a chopper arm; when DirCTL=0, the H-bridge switching device T _1 and T _2 As the chopper arm, the H-bridge switching device T _3 and T _4 as a steering arm. The exchange of the direction arm and the chopper arm is realized by introducing the control signal DirCTL. Figure 4 Output voltage waveforms for sing...
Embodiment 2
[0048] The invention is also applicable to single-phase H-bridge converters. According to the unipolar SPWM non-dead zone control modulation method of the present invention, the PWM driving signal of the single-phase H-bridge converter is as follows: Figure 5 shown. Figure 6 is the voltage waveform at the output terminal of the H-bridge converter.
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