Ultra-low-voltage direct-current variable-frequency controller and parking air conditioner

Abstract

The invention discloses an ultra-low-voltage direct-current variable-frequency controller and a parking air conditioner. The ultra-low-voltage direct-current variable-frequency controller comprises: apower supply circuit; a DC output assembly circuit; a DC fan interface circuit connected with a compressor phase current overcurrent protection circuit and a sampling circuit; the compressor phase current overcurrent protection circuit; and a control circuit comprising a control chip IC1, wherein the model of the control chip IC1 is R5F24TXADFM, the control circuit is connected with a serial communication sending circuit, a serial communication receiving circuit and an external circuit, and the DC fan interface circuit and the DC output assembly circuit are connected with the control circuit.According to the invention, the DC output assembly circuit and the control circuit are combined, and the voltage / current waveform of the compressor is sine waves, so that the ultra-low-voltage direct-current variable-frequency controller is small in harmonic interference, low in operation noise, high in efficiency and the like.

Description

technical field [0001] The invention relates to the technical field of controllers, in particular to an ultra-low voltage DC frequency conversion controller and a parking air conditioner. Background technique [0002] Most of the existing air conditioners are controlled by constant speed, and the cooling capacity control can only be adjusted by "on-off" mode, and the corresponding temperature fluctuation is relatively large. Judging from domestic / foreign development trends, high-efficiency and energy-saving inverter air conditioners have gradually become the mainstream of consumption. At present, frequency conversion drives are divided into two categories: AC and DC. Compared with DC frequency conversion, AC frequency conversion has disadvantages such as copper / iron loss and large eddy current loss. The DC inverter compressor mainly adopts a permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM for short), which has the advantages of small size and hi...

AI Technical Summary

Problems solved by technology

[0003] At present, the rectangular wave mode of "two phases conducting at the same time" is mainly used for variable frequency drive, and the phase current waveform is approximately rectangular, resulting in abundant high-order harmonics in the main circuit and poor electromagnetic compatibility.

Moreover, when running at low frequency, the torque fluctuation is large, so the vibration and noise of the compressor running are relatively large

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