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Sensor-less sine DC (direct current) variable frequency current sampling method

A technology of current sampling and DC frequency conversion, which is applied in the direction of converting AC power input to DC power output, electrical components, and controlling generators. It can solve the problems of unable to sample two-way PWM modulation and sampling blind areas, etc., to expand operational reliability, The effect of improving the utilization rate and ensuring the accuracy of current sampling

Active Publication Date: 2011-06-08
MIDEA GRP CO LTD
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Problems solved by technology

[0021] The present invention provides a sensorless sinusoidal DC variable frequency current sampling method to solve the technical problem that the resistance sampling method in the prior art has a sampling blind area and cannot sample two channels of PWM modulation

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  • Sensor-less sine DC (direct current) variable frequency current sampling method
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  • Sensor-less sine DC (direct current) variable frequency current sampling method

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Embodiment Construction

[0059] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0060] For example, in the analysis of the resistance sampling scheme in the background technology, it can be found that the single-resistance sampling and the dual-resistance sampling have their own sampling blind areas, but each has no current sampling blind area of ​​the other, and the voltage utilization rate of the dual-resistance sampling is not high. There are disadvantages such as PWM modulation, etc., in short, each has its own advantages and disadvantages. The design direction of the current sampling optimization scheme is to solve the current sampling blind area problem existing in the two current sampling methods. It is necessary to adopt the two-phase PWM modulation method to ensure the current sampling accuracy, improve the utilization rate of the bus voltage, and reduce the power loss of the module. At the same time, it...

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Abstract

The invention relates to the technical field of variable frequency control, in particular to a current sampling method for a frequency converter, comprising: when performing current sampling during phase sampling, detecting and sequencing the phases of a three-phase voltage, and determining a voltage maximum-phase signal, a voltage middle-phase voltage and a voltage minimum-phase signal; performing current sampling of the current vector information corresponding to the voltage middle-phase signal and the current vector information corresponding to the voltage minimum-phase signal, wherein thecurrent vector information corresponding to the voltage maximum-phase signal is an inverted phase of the sum of the current vector information corresponding to the voltage middle-phase signal and thecurrent vector information corresponding to the voltage minimum-phase signal. In the method provided by the invention, the problem that a current sampling dead zone exists in two recent sampling modes is solved, and synchronously current sampling precision is guaranteed by adopting a two-phase PWM (pulse-width modulation) modulation mode.

Description

technical field [0001] The invention relates to the technical field of frequency conversion control, in particular to a sensorless sinusoidal DC frequency conversion current sampling method. [0002] Background technique [0003] The core of frequency conversion air conditioner is frequency conversion compressor and frequency conversion drive technology. The development of frequency conversion control technology and frequency conversion compressor is complementary. At present, frequency conversion compressor has developed three generations of products: AC frequency conversion compressor, DC brushless motor DC frequency conversion compressor, Permanent magnet synchronous motor DC frequency conversion compressor, the corresponding frequency conversion control technology has also developed three generations: AC frequency conversion control technology, 120 ° square wave DC frequency conversion control technology, 180 ° sine wave DC frequency conversion control technology (also k...

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Application Information

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IPC IPC(8): H02P21/14H02P21/12H02M7/5395H02P21/24
Inventor 刘俊杰严光
Owner MIDEA GRP CO LTD
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