A method and device for generating pwm pulses of a multilevel inverter
A multi-level inverter and pulse generation technology, applied in the direction of output power conversion device, pulse duration/width modulation, electrical components, etc., can solve the problem of shortage of DSP peripheral units, and achieve the solution of DSP peripheral units The effect of shortage and quantity saving
Active Publication Date: 2017-06-13
SUNGROW POWER SUPPLY CO LTD
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[0006] In view of this, the present invention provides a multi-level inverter PWM pulse generation method and device, which solves the problem of shortage of DSP peripheral units for realizing multi-level inverter PWM pulse output in the prior art
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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0044] For the PWM peripheral unit in the DSP chip of the Texas Instruments C2000 series to realize the increase and decrease comparison of the duty cycle and the triangular carrier wave alone, and to output the corresponding PWM pulse method, it is necessary to realize the three-level inverter PWM pulse (ie PWM high-frequency signal), all PWM peripheral units that need to use the DSP chip will no longer be able to expand the number of inverter levels; moreover, ...
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This application provides a method and device for generating PWM pulses for an inverter. The invention utilizes the high-frequency complementary characteristics of the switching tubes of a three-phase multi-level inverter and only uses the output of three PWM peripheral units in the DSP control unit. PWM high-frequency signal, the detection control unit determines the current two high-frequency complementary switch tubes in the phase as the switch tubes to be processed based on the current status of the detected level signals output by the preset number of GPIO interfaces, and sets the PWM high The frequency signal is assigned to any one of the switch tubes to be processed, and the PWM high-frequency signal is inverted and sent to the other switch tube to be processed. At the same time, according to the preset different switching cycles, the multi-level inverter The corresponding relationship between the status of the switch tube and the output level can be determined by keeping the status of other switch tubes unchanged. It can be seen that compared with the existing technology, this application saves the need for external DSP to realize the PWM pulse output of the multi-level inverter. The number of units is greatly reduced, which greatly reduces the difficulty of expanding the number of levels of the inverter.
Description
technical field [0001] The invention mainly relates to the technical field of pulse width modulation, and more specifically relates to a method and device for generating PWM pulses of a multilevel inverter. Background technique [0002] In recent years, with the rapid development of new energy and distributed power generation technologies, multi-level inverters, especially three-level inverters and five-level inverters, have been widely used. In practical applications, pulse width Pulse-Width Modulation (PWM) technology realizes multi-level inverter control, in which, the more levels of the inverter, the greater the number of PWM pulse outputs required, and the corresponding PWM pulse wave transmission method is also more efficient. complex. [0003] In the prior art, usually the PWM peripheral unit in the DSP (Digital Signal Processing, digital signal processing) chip of the C2000 series is used alone to realize the increase and decrease comparison of the duty cycle and th...
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IPC IPC(8): H02M7/483
CPCH02M7/483H02M7/53873H02M7/5395H02M7/487H03K7/08
Inventor 李晓迅李浩源梅晓东韩志强杨本和申凯
Owner SUNGROW POWER SUPPLY CO LTD