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A SPWM wave generation method injected into LCC-S topology

A technology of LCC-S and topological structure, applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., can solve the problems of complex output voltage control and high harmonic content of input current, and realize Simple, reliable, and scalable effects

Active Publication Date: 2022-04-15
JIANGSU FRONTIER ELECTRIC TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to solve the problem that the input current harmonic content of the LCC-S system is high and the output voltage control is relatively complicated. A SPWM wave injected LCC-S system is proposed to reduce the input current harmonic content and the The output voltage is controlled

Method used

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  • A SPWM wave generation method injected into LCC-S topology
  • A SPWM wave generation method injected into LCC-S topology
  • A SPWM wave generation method injected into LCC-S topology

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Embodiment Construction

[0031] Embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0032] Such as figure 1 As shown, the input voltage of the LCC-S compensation wireless power transfer system topology is kept constant, and the inverter is subjected to SPWM modulation. The carrier frequency is 400kHz, and the modulation wave frequency is 20kHz. At this time, the waveform of the output voltage U1 is the SPWM modulation waveform , its fundamental wave component content is relatively high, and the input voltage of the system can be equivalent to a 20kHz sine wave. The SPWM wave generation method and the input voltage regulation method of the system are introduced in detail below.

[0033] SPWM wave generation method:

[0034] There are digital methods and analog methods for generating SPWM waves. The present invention utilizes digital methods to produce SPWM waveforms. The carrier frequency is 400kHz, and the modulation wave ...

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Abstract

The invention discloses a method for generating SPWM waves injected into an LCC-S topology, comprising the following steps: determining the carrier frequency, modulating wave frequency and carrier ratio, setting n sampling points of the sine wave to be modulated according to the carrier ratio and collecting the sine function value k n , n∈(1,10); the collected sine function value k n Send it to the DSP signal processor to calculate the duty cycle and high-level duration in each cycle; according to the duty cycle and high-level duration, in the positive half cycle of the sine wave, control the switch tube S1, the switch The tube S4 is turned on; in the negative half cycle of the sine wave, the switch tube S2 and the switch tube S3 are turned on to generate a SPWM wave; adjust the equivalent output voltage of the inverter, and calculate and modify according to the expected sine wave amplitude After the duty cycle; reconfigure the PWM signal to adjust the equivalent output voltage according to the modified duty cycle. In this method, the high-order harmonic components of the injected current are relatively low, and the output voltage is controlled by adjusting the modulation ratio, directly programmed and controlled by a DSP signal processor, and has high reliability and strong expansibility.

Description

technical field [0001] The invention belongs to the technical field of wireless energy transmission, and in particular relates to a method for generating SPWM waves injected into an LCC-S topological structure. Background technique [0002] With the development of human society, human society relies more and more on electricity, and all aspects of industrial production and daily life are inseparable from electric energy. Therefore, people put forward new requirements for the supply mode of electric energy. In recent years, wireless power transmission technology has developed vigorously, and wireless power transmission technology is favored by researchers and users for its convenience and flexibility. [0003] The LCC-S structure is a common topology of wireless power transmission systems. This topology has the advantages of constant transmitting coil current and receiving coil output voltage. The topology design method is mature and the design process is simple. [0004] T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J50/10H02M7/5395H02M1/12
CPCH02J50/10H02M7/5395H02M1/12H02M1/0012
Inventor 徐妍官国飞陈志明李军谭林林李乘云黄学良
Owner JIANGSU FRONTIER ELECTRIC TECH