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Modulation device and method for an inverter

A technology of inverter and modulated wave, which is applied in the field of inverter and its modulation, and can solve the problems of increasing output current ripple and increasing magnetic loss of output filter

Active Publication Date: 2015-12-09
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the common continuous modulation method has a small output ripple and can obtain a good output current. Compared with the continuous modulation method, the discontinuous modulation method can reduce the switching loss of the bridge arm. On the other hand, , increases the ripple of the output current, thereby increasing the magnetic loss on the output filter

Method used

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  • Modulation device and method for an inverter
  • Modulation device and method for an inverter
  • Modulation device and method for an inverter

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Embodiment Construction

[0024] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] Such as figure 1 As shown, the modulation device of the inverter is: A-phase continuous modulation wave generator 1 and A-phase discontinuous modulation wave generator 2 are respectively connected to the 1-pin input terminal and 2-pin input terminal of the first selector 7, the first selection The output terminal of device 7 connects the positive input terminal of the first comparator 10 and the positive input terminal of the second comparator 11 simultaneously, and the first triangular wave generator 46 connects the negative input terminal of the first comparator 10, and the second triangular wave generator 47 Connect the negative input terminal of the second comparator 11, the output terminal of the first comparator 10 is connected the input terminal of the first inverter 16 and the input terminal of the first dead zone module 22 simultaneously, the output t...

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Abstract

The invention discloses an inverter modulating device and method. According to the inverter modulating device and method, two modulating modes can be controlled to be switched by detecting the output power and comparing an output power value and a set power value, continuous modulating waves are adopted when the output power is lower than the set power, intermittent modulating waves are adopted when the output power is higher than the set power, and the selected modulating waves are used as driving signals of an inverter through output signals of the modulating device. According to the inverter modulating method, when the load of the inverter is light and switching loss is not obvious, the continuous modulating waves are adopted to reduce loss of an output filter to further improve efficiency; when the load of the inverter is heavy, the intermittent modulating waves are adopted to greatly reduce the switching loss of the inverter to further improve the efficiency, as a result, the efficiency of the inverter is higher than that which is achieved with a single kind of modulating waves within the full power range, the switching mode is simple and reliable, and the inverter modulating method is easy to realize.

Description

technical field [0001] The invention relates to an inverter and its modulation technology, in particular to a modulation device and method for an inverter. Background technique [0002] Inverters are devices that convert direct current into alternating current and are used in a wide range of applications. At present, the modulation method of the inverter often uses a single modulation method, and each modulation method has a certain optimal working range. For example, the common continuous modulation method has a small output ripple and can obtain a good output current. Compared with the continuous modulation method, the discontinuous modulation method can reduce the switching loss of the bridge arm. On the other hand, , which increases the ripple of the output current, thereby increasing the magnetic loss on the output filter. Efficiency is a very important factor for inverters. Higher inverter conversion efficiency means that more power can be output, and for the inverte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48
Inventor 徐德鸿严成张扬帆孙超刘程宇延汇文吴吉良
Owner ZHEJIANG UNIV
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