Pulse width modulation method for temporarily changing carrier form
A technology of pulse width modulation and form, applied in the direction of pulse duration/width modulation, output power conversion device, electrical components, etc., can solve the problems of key signal failure, inconsistent control results, pulse loss, etc.
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[0077] figure 1 In order to feed back inaccurate waveforms, the number of drive waveform level changes in the third cycle is 3 times (when the full 1 duty cycle is switched to a normal duty cycle), which is greater than the allowable number of drive waveform level changes (should be 2 times).
[0078] figure 2 and image 3 Two implementations are provided, Example 1 ( figure 2 ) The temporary carrier waveform in the third control cycle is a monotonically increasing waveform, embodiment two ( image 3 ) in the third control period of the temporary carrier waveform is to first decrease and then increase and then decrease again, and the replacement periods of implementation one and two can be completed in one control period;
[0079] figure 2 and image 3 The replacement of the basic carrier by the temporary carrier is completed within one control cycle (within the third control cycle);
[0080] Figure 4 Inaccurate waveform timing diagram for feedback;
[0081] Fig...
Embodiment 1
[0083] 1. System configuration parameters: the main controller chip is Infineon TC27* series chips, and the hardware pulse output circuit and drive circuit follow the main controller chip to drive waveform output;
[0084] System requirements: control frequency, sampling frequency are consistent with switching frequency of power devices, carrier symmetry requirements: as small as possible, carrier asymmetry is allowed in special cases;
[0085] Configure as figure 1 and figure 2 The symmetrical basic carrier shown (shown in the first and second modulation cycles), such as the central symmetry first decreases and then increases, ensures that the upper tube drive waveform is centered and the high level is centered;
[0086] 2. Inverter state quantity: During the modulation process, the modulation wave contains a normal duty cycle and a full 1 duty cycle (the second modulation period), such as Figures 1 to 2 As shown, the power device temperature is within the allowable tempe...
Embodiment 2
[0089] The temporary carrier configured in Embodiment 2 is a phase-shifted carrier, and the phase shift angle=360°×(1-normal duty cycle). The switching signal waveform modulated by the temporary carrier is a two-stage type, such as figure 1 and image 3 as shown,
[0090] 1. Consistent with the system configuration and system requirements of Embodiment 1, it is also the system configuration parameters: the main controller chip is Infineon TC27* series chips, and the hardware pulse output circuit and drive circuit follow the main controller chip to drive waveform output; the system Requirements: The control frequency and sampling frequency are consistent with the switching frequency of power devices, carrier symmetry requirements: as small as possible, carrier asymmetry is allowed in special cases; configuration such as figure 1 Symmetrical basic carrier shown: central symmetry decreases first and then increases, to ensure that the drive waveform of the upper tube is symmetric...
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