A frequency conversion controller and control method for a refrigerator direct current sensorless compressor

A frequency conversion controller and control method technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve the problem of difficult and accurate positioning of the compressor rotor, and achieve the effects of avoiding system vibration, improving reliability, and improving driving efficiency

Active Publication Date: 2020-09-29
江苏源坤电子科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the compressor rotor is difficult to locate accurately during the position detection process, the present invention proposes a DC sensorless compressor frequency conversion controller and control method for refrigerators

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  • A frequency conversion controller and control method for a refrigerator direct current sensorless compressor
  • A frequency conversion controller and control method for a refrigerator direct current sensorless compressor
  • A frequency conversion controller and control method for a refrigerator direct current sensorless compressor

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Embodiment Construction

[0054] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0055] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless defined as herein Explanation.

[0056] figure 1 and figure 2 They are respectively the system circuit block diagram and the software control block diagram of the frequency conversion refrigerator driver of the present invention. Combine below figure 1 and figure 2 Briefly describe the working principle of the present inv...

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Abstract

The invention discloses a direct-current no-sensing compressor variable frequency controller for a refrigerator, and a control method. The controller comprises a power supply filtering circuit, a power supply rectification circuit, a direct-current power supply conversion circuit, a voltage sampling circuit, a MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) driving circuit, a power driving circuit, a microprocessor control circuit, a compressor current detection circuit and a communication module circuit. The invention also discloses a control method for the variable frequency controller. In a rotor position detection state, voltage vectors of different directions can be applied to a compressor stator winding, and according to detected feedback current, a rotor position is calculated; through a rotor position in a rotor pre-positioning process, real-time detection is carried out so as to obtain an accurate position where a compressor rotor is positioned during each-time startup to be convenient in applying a corresponding driving vector, system vibration caused by rotor inversion is avoided, driving efficiency is improved, and the reliability of the controller is improved.

Description

technical field [0001] The invention relates to the field of frequency conversion motor control, in particular to a frequency conversion controller and a control method for a direct current sensorless compressor of a refrigerator. Background technique [0002] Most of the existing frequency conversion controllers for household refrigerators adopt the vector control method without position sensing, and adopt the "three-stage" starting method. The "three-stage" starting method is that the starting frequency gradually increases from 10Hz, 30Hz, and 50Hz. In the case of a relatively large pressure difference in the refrigerator system, inaccurate positioning may occur during the pre-positioning process, resulting in failure to start. Part of the "high-frequency injection method" uses the influence of the salient polarity of the compressor on the high-frequency current waveform to obtain the rotor position signal. Due to the complexity of the software algorithm, the performance r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08
Inventor 甘晓鹏
Owner 江苏源坤电子科技有限公司
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