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Air conditioner and compressor control method and device when supply voltage drops

A control method and control device technology, applied in heating and ventilation control systems, pump control, machines/engines, etc., can solve problems such as damaged input circuits, limited overcurrent capacity of input circuits, failure of air conditioning systems, etc., to protect input circuits , reduce input current, stable and reliable operation effect

Active Publication Date: 2015-10-07
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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AI Technical Summary

Problems solved by technology

[0004] However, when the input grid voltage drops, the input current of the PFC circuit will inevitably increase because the load power is basically unchanged, and the overcurrent capability of the input circuit is limited. When the input current of the PFC circuit is too large, the input circuit will be damaged. air conditioning system failure

Method used

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  • Air conditioner and compressor control method and device when supply voltage drops
  • Air conditioner and compressor control method and device when supply voltage drops
  • Air conditioner and compressor control method and device when supply voltage drops

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Embodiment Construction

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0023] The method for controlling the compressor when the power supply voltage of the air conditioner drops, the control device for the compressor in the air conditioner, and the air conditioner with the control device are described below with reference to the accompanying drawings.

[0024] figure 1 It is a schematic diagram of an input circuit of an air conditioner according to an embodiment of the present invention. Such as figure 1 As shown, the air conditioner includes a PFC circuit, an electrolytic capacitor EC1 and an IP...

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Abstract

The invention discloses a compressor control method when supply voltage of an air conditioner drops; the method comprises the following steps: detecting an input current instantaneous value of a PFC circuit in real time, and calculating a PFC circuit input current effective value according to the input current instantaneous value; calculating a difference value between the input current effective value and a preset input current underclocking threshold if the input current effective value is bigger than the preset input current underclocking threshold, and generating a first underclocking frequency according to the difference value; adding the first underclocking frequency to a compressor given frequency so as to generate a compressor final given frequency; generating a control signal according to the compressor final given frequency, thus using an IPM to carry out vector control for the compressor. The control method can carry out underclocking control for the compressor if the input current of the PFC circuit is overlarge, thus reducing output power of the compressor, reducing the input current of the PFC circuit, and protecting the input circuit. The invention also discloses an air conditioner compressor control device, and the air conditioner.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a method for controlling a compressor when the power supply voltage of an air conditioner drops, a control device for a compressor in the air conditioner, and an air conditioner with the control device. Background technique [0002] In household air conditioners and other similar systems, generally the single-phase AC power from the power grid is firstly rectified by an uncontrollable full-bridge, and then boosted by a PFC (Power Factor Correction, power factor correction) circuit to output a DC power supply and connect it to a large-capacity Electrolytic capacitors and loads (such as switching power supplies, compressors and fans within the system, etc.). Among them, the compressor is the main load, and the output power of the compressor accounts for more than 90% of the total input power at the rated output. [0003] Generally, Boost power factor correction circui...

Claims

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Application Information

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IPC IPC(8): F04B49/06F24F11/00
Inventor 黄招彬
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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