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Current Frequency Limiting Method and Device for Inverter Air Conditioner

A frequency conversion air conditioner and current technology, applied in the direction of electrical components, AC motor control, control system, etc., can solve problems such as overcurrent failure, device heating, device damage, etc., to reduce input current, improve heating conditions, and avoid over-current The effect of stream failure

Active Publication Date: 2018-02-02
GD MIDEA AIR-CONDITIONING EQUIP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the related technology, as the operating frequency of the compressor increases, the input current increases accordingly, which makes the devices in the input circuit to heat up seriously, and may also cause overcurrent faults, resulting in damage to the devices

Method used

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  • Current Frequency Limiting Method and Device for Inverter Air Conditioner
  • Current Frequency Limiting Method and Device for Inverter Air Conditioner
  • Current Frequency Limiting Method and Device for Inverter Air Conditioner

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Embodiment Construction

[0021] 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.

[0022] The current frequency limiting method and device for an inverter air conditioner proposed by an embodiment of the present invention will be described below with reference to the accompanying drawings. Wherein, the single-phase AC power is rectified by a rectifier circuit and then input to a PFC (Power Factor Correction, power factor correction) circuit.

[0023] according to Figure 2-3 As an example, an inverter air conditioner may include a rectifier circuit 10 , a PFC (Power Factor Correction, power factor correction) ...

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Abstract

The invention discloses a current frequency limiting method and device for an inverter air conditioner. The inverter air conditioner includes a rectifier circuit, a power factor correction PFC circuit and a compressor. The input end of the PFC circuit is connected to the output end of the rectification circuit, and the output end of the PFC circuit is connected to The compressor is connected, and the method includes the following steps: obtaining the input current effective value Iin_rms of the inverter air conditioner; subtracting the input current effective value Iin_rms from the preset current frequency limiting threshold to obtain the current between the input current effective value Iin_rms and the current frequency limiting threshold difference, and judge the current difference; if the current difference is greater than or equal to the first threshold, the compressor is controlled to stop running; if the current difference is greater than or equal to the second threshold and less than the first threshold, the compressor is controlled to follow the preset Step-length down-frequency operation, wherein the second threshold is smaller than the first threshold, thereby reducing the output power by controlling the operating frequency of the compressor, thereby reducing the input current, improving the heating condition of the input circuit, and avoiding overcurrent faults .

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a current frequency limiting method for an inverter air conditioner and a current frequency limiting device for an inverter air conditioner. Background technique [0002] In a single-phase AC power input system such as a household air conditioner, the single-phase AC power from the grid usually passes through an uncontrollable full-bridge rectifier circuit first, then passes through a power factor correction circuit, then outputs DC and connects it to a large-capacity electrolytic capacitor, and finally provides it to Loads such as internal switching power supplies, compressors and fans, etc. [0003] In the related art, as the operating frequency of the compressor increases, the input current increases accordingly, which makes the components in the input circuit heat up severely, and may also cause an overcurrent fault and cause damage to the components. Therefore, rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P23/00
Inventor 黄招彬于光黄勇
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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