Unipolar SPWM (Sine Pulse Width Modulation) dead-time-free modulation method of H-bridge cascade 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 adding dead time and occupying large processor resources, etc., to solve the imbalance problem, Solve thermal imbalance, facilitate heat dissipation design and long-term operation effect
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[0045] Example 1
[0046] A single-phase H-bridge cascaded multi-level converter topology structure such as figure 1 As shown, when the number of cascaded sub-modules is 2, the triangular wave carrier phase angle difference between the sub-modules is 180°. According to the unipolar SPWM non-dead-zone control modulation method based on carrier phase shift according to the present invention, each sub-module The PWM drive signal such as image 3 Shown. by image 3 It can be seen that the direction arm drive signal of each sub-module is the same. When DirCTL=1, the H-bridge switching device T _1 And T _2 As a direction arm, 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 a chopper arm, H-bridge switching device T _3 And T _4 As a direction arm. By introducing the control signal DirCTL, the direction arm and the chopper arm are interchanged. Figure 4 Output voltage waveform for single-phase five-level cascade con...
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[0047] Example 2
[0048] The invention can also be applied 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 Figure 5 Shown. Image 6 Is the voltage waveform at the output terminal of the H-bridge converter.
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