Method and circuit for controlling changing cyclic width lag cyclic current of inventer

A hysteresis current and inverter technology, applied in the field of hardware circuits, can solve the problems of switching frequency fluctuation, unstable switching frequency, difficult system design, etc., to achieve the effect of optimized design and reduced volume and weight

Inactive Publication Date: 2006-11-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the hysteresis current control also has the disadvantage that the switching frequency is not fixed.
People have done a lot of research work to overcome this shortcoming: use phase-locked loop technology to compare the switching signal with a square wave signal with a fixed frequency, get the phase difference, and then get the expected hysteresis comparator ring width through the proportional integral link ;In the control loop, a feed-forward compensation link is added to correct the current error; after three-phase decoupling, the optimized voltage vector is selected to adjust the hyst

Method used

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  • Method and circuit for controlling changing cyclic width lag cyclic current of inventer
  • Method and circuit for controlling changing cyclic width lag cyclic current of inventer
  • Method and circuit for controlling changing cyclic width lag cyclic current of inventer

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Embodiment Construction

[0028] Such as figure 1 As shown, the inverter system using the variable loop width hysteresis loop current control method of this embodiment replaces the traditional fixed loop wide hysteresis loop comparator with a variable loop width hysteresis loop comparator with controllable loop width, increasing the loop Wide calculation link, according to the bus voltage U from the inverter d and the output voltage u o Feedback value, according to switching frequency and bus voltage U d , hysteresis width h, output voltage u o And the relationship between the filter inductance L, through calculation, the value of the hysteresis ring width h required to maintain a constant switching frequency is obtained. The specific steps for calculating the ring width are as follows:

[0029] 1) Calculate the coefficient K according to the aforementioned formula (5) and formula (6) 1 and K 2 ;

[0030] 2) Bus voltage multiplied by coefficient K 1 Get the ring width DC component H;

[0031] 3...

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Abstract

This invention discloses a controlling method to inverters of width sluggish loop current by changing the loop width and a circuit, in which, the method includes: 1, computing loop width to get a signal of the width of a sluggish loop, 2, sending said signal to a comparison segment of a changed loop width and the sluggish loop, the other input volume of which is the current error signal of the inverter, the comparison segment carries logic operation to get a pulse width modulation waveform to drive the operation of the master circuit switch of the inverter, its circuit is a loop width adjusting circuit and a changed loop width and sluggish loop comparator, which maintains the character of the traditional fixed loop width sluggish loop current control and realizes the constant switch frequency of the inverter controlled by the sluggish loop current.

Description

1. Technical field [0001] The invention relates to an inverter control method, in particular to a hysteresis current control method with variable loop width and a corresponding hardware circuit for realizing the method. 2. Background technology [0002] The current control two-state modulation system uses the actual current signal of the inverter to compare with the current given signal. If the actual current exceeds a certain range of the given value, it controls the increase or decrease of the current by changing the switch state of the inverter to achieve the actual Fast tracking of current to current reference. The current-controlled two-state system also has built-in current-limit protection capability. Usually the inverter adopts double-loop control. Due to the high stability of the current inner loop, the voltage outer loop can achieve high gain, the system output voltage accuracy is high, and the dynamic performance is improved. The current inner loop is equivalent...

Claims

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Application Information

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IPC IPC(8): H02M7/521H02M7/539
Inventor 洪峰严仰光单任仲王慧贞
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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