Electric signal-based household appliance single-rotor compressor variable frequency controller and implementation method thereof

Abstract

The invention discloses an electric signal-based household appliance single-rotor compressor variable frequency controller and an implementation method thereof. The controller comprises a single-resistor detection circuit, a filter and amplifier circuit, a fault clearance and software filter module, a three-to-two-phase system conversion module, a rotor position determination module, a two-to-three-phase conversion module and a three-phase conduction time fanlike module, wherein the rotor position determination module comprises a parameter input module, a low pass filter module, a current pre-estimation module and a rotor position pre-estimation module. The implementation method comprises the following steps of: (a) detecting the three-phase current of the single-rotor compressor; (b) amplifying an acquired signal and judging the abnormity; (c) converting three-phase voltage into two-phase voltage; (d) pre-estimating the rotor position of the compressor; and (e) controlling the rotor of the compressor to rotate. The controller and the method have the advantages of rapid stabilization of the working condition, stable load, low energy consumption, small noise and the like.

Description

[technical field] [0001] The invention relates to an electrical signal-based frequency conversion controller for a single-rotor compressor of a household appliance and a realization method thereof, which are specifically applied to frequency-variable speed regulation and control of single-rotor compressors in air conditioners, refrigerators, and washing machines. [Background technique] [0002] Frequency conversion technology can operate with the most suitable output power according to different working conditions. However, traditional fixed-frequency compressors can only be controlled in steps by continuously "on and off", which not only easily causes the controlled target to fluctuate up and down, but also consumes a lot of power. The frequency conversion control is to use the change of the operating frequency of the compressor to achieve the control purpose, so the fluctuation is small, the comfort is greatly improved, and the power consumption is also small. In particul...

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Problems solved by technology

At low frequencies, the current and voltage changes of synchronous motors are small. Many scholars and engineers at home and abroad have conducted research on motor position estimation based on tiny signals. They have proposed modern methods such as neural networks and wavelet analysis, and have achieved certain results. However, these The technology has the disadvantages of huge amount of calculation, complex calculation means, and difficulty in practical application

[0006] In addition, the existing frequency converter has the disadvantages of unstable load, large noise and large energy consumption during the process of fast frequency conversion

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