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Inverter and pulse width modulation (PWM) method thereof

A modulation method and inverter technology, which are applied in the direction of irreversible DC power input to AC power output, AC power input to DC power output, and output power conversion devices, etc., can solve problems such as electromagnetic interference, and achieve The effect of high busbar utilization, avoiding ground leakage current and electromagnetic interference

Active Publication Date: 2014-11-05
HUAWEI DIGITAL POWER TECH CO LTD
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Problems solved by technology

Since the common-mode voltage is relatively high and contains high-frequency components, and there is a coupling capacitor between the inverter output load and the grounded chassis, the injection of the common-mode voltage into the PWM modulation signal will cause the coupling capacitor to generate leakage current. When the magnitude of the leakage current exceeds the threshold, the high-frequency component of the common-mode voltage is added to radiate the electromagnetic field generated by the current, thereby causing electromagnetic interference

Method used

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  • Inverter and pulse width modulation (PWM) method thereof
  • Inverter and pulse width modulation (PWM) method thereof
  • Inverter and pulse width modulation (PWM) method thereof

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[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. 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.

[0029] refer to figure 1 , figure 1 is a flow chart of the first embodiment of the PWM modulation method of the present invention. The PWM modulation method disclosed in this embodiment is applied to an inverter, wherein the DC bus of the inverter inputs a DC voltage, and the processing unit of the inverter controls the switching on or off of the switching tube of the inverter according to the PWM modulation method, so as to Make the inverter...

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Abstract

The present invention discloses an inverter and its PWM modulation method, where the PWM modulation method includes providing a modulation signal, obtaining an amplitude value of a third harmonic according to a modulation ratio of the modulation signal, injecting the third harmonic into the modulation signal and generating a PWM drive signal, and inputting the PWM drive signal into the control end of an inverter switch tube to control turning on or turning off of the inverter switch tube. Through the foregoing method, the present invention can achieve that the inverter has maximum bus utilization and minimum common-mode voltage to avoid generating relatively high ground leakage current and relatively serious electromagnetic interference.

Description

technical field [0001] The invention relates to the field of inverters, in particular to an inverter and a PWM modulation method thereof. Background technique [0002] Inverters play a vital role in the development and utilization of renewable energy. The inverter is a power electronic converter that converts DC power into AC power through the on and off functions of semiconductor power switching devices. Inverters in the prior art improve the utilization rate of the bus voltage of the inverter by injecting a common-mode voltage into a PWM (Pulse Width Modulation, pulse width modulation) modulation signal, wherein the common-mode voltage is relative to the midpoint of the inverter output Voltage at a grounded enclosure at fixed potential. Since the common-mode voltage is relatively high and contains high-frequency components, and there is a coupling capacitor between the inverter output load and the grounded chassis, the injection of the common-mode voltage into the PWM mo...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/487
CPCH02M7/487H02M7/5395
Inventor 郭海滨刘云峰王丹
Owner HUAWEI DIGITAL POWER TECH CO LTD
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