Control method and control system of APFC circuit voltage, and air conditioner

A control method and circuit voltage technology, applied in the direction of high-efficiency power electronic conversion, electrical components, output power conversion devices, etc., can solve the problems of low utilization rate of DC voltage, increased cost, and inability to meet the operation needs of compressors, etc., to achieve DC The effect of maximizing bus voltage utilization

Active Publication Date: 2018-11-13
AUX AIR CONDITIONING LTD BY SHARE LTD
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Problems solved by technology

Therefore, the output voltage of APFC must be reasonably controlled. If it is too high, it will lead to low utilization rate of DC voltage, increase the withstand voltage...

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  • Control method and control system of APFC circuit voltage, and air conditioner
  • Control method and control system of APFC circuit voltage, and air conditioner
  • Control method and control system of APFC circuit voltage, and air conditioner

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Embodiment Construction

[0053] It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other if there is no conflict.

[0054] The present invention provides a method for controlling APFC circuit voltage, which includes the following steps:

[0055] Step S1, real-time detection of DC bus voltage V dc And input AC voltage peak value V ac_peak , And obtain the current compressor operating frequency F, and obtain the device withstand voltage value;

[0056] Step S2, according to the current compressor operating frequency F, the input AC voltage peak value V ac_peak , The device withstand voltage value, calculate the APFC circuit voltage given value V dc_ref ;

[0057] Step S3, the real-time detected DC bus voltage V dc And the given voltage V dc_ref For comparison, the DC bus voltage output by the APFC circuit is kept constant through adjustment.

[0058] The present invention will be described in detail below in conjunction with the dra...

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Abstract

The invention provides a control method of an APFC circuit voltage. The control method comprises the steps that a direct-current bus voltage and an input alternating-current voltage peak value are detected in real time, the operation frequency of a current compressor is obtained, and the voltage withstanding value of a device is obtained; according to the operation frequency of the current compressor, the input alternating-current voltage peak value and the device voltage withstanding value, a voltage given value of an APFC circuit is obtained through calculation; and the direct-current bus voltage detected in real time is compared with the voltage given value, and the voltage of the direct-current bus output by the APFC circuit is kept constant by adjustment. The invention further provides a control system of the APFC circuit voltage and an air conditioner. According to the calculation method of the voltage given value of the APFC circuit provided by the invention, the voltage of thedirect-current bus output by the APFC circuit is adjusted according to the voltage given value, so as to achieve the maximization utilization rate of the direct-current bus voltage; and meanwhile, byvirtue of the boosting property of the APFC circuit, different AC input voltages can be adapted.

Description

Technical field [0001] The present invention relates to the technical field of electrical appliance control, in particular to a control method, control system and air conditioner of APFC circuit voltage. Background technique [0002] APFC (active power factor correction) circuit can improve the power factor and stabilize the DC voltage. It has been used in inverter air conditioners and similar household appliances. In the prior art, the APFC circuit topology commonly used in single-phase power inverter air conditioners is as figure 1 As shown, AC power supplies power to the permanent magnet synchronous motor through AC-DC-AC conversion; the APFC circuit topology commonly used in three-phase power inverter air conditioners is as follows figure 2 As shown, the AC input terminal passes through the input inductor L A , L B , L C Connected to the grid, the DC output terminal is connected to the load after the output filter capacitor. [0003] The DC bus voltage plays a role as a link b...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 李超游剑波
Owner AUX AIR CONDITIONING LTD BY SHARE LTD
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