Pfc control method, device and air conditioner of ac-dc converter
A control method and control device technology, applied in the PFC field, can solve problems such as reducing capacitor life, large fluctuations, and affecting the reliability of air-conditioning control systems, and achieve the effect of reducing fluctuations
Active Publication Date: 2017-09-22
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology
[0003] At present, air conditioners generally use single-rotor compressors. Due to the relatively large load torque fluctuations, the DC side voltage of the single-rotor compressors will fluctuate greatly, and there will be large ripples, and the fluctuating voltage will affect the control system of the air conditioner. Reliability, at the same time, due to the existence of large capacitors on the DC side, the voltage ripple will generate a large ripple current, and the large ripple current will cause a temperature rise on the capacitor, which will reduce the life of the capacitor
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[0037] 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 only for explaining the present invention and should not be construed as limiting the present invention.
[0038] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, components and arrangements of specific examples are described below. Of course, they are only examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity and does not in itself indicate ...
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The invention discloses a PFC control method of an AC-DC convertor in an air conditioner. The method includes the following steps that the output voltage and the input current of the AC-DC convertor are sampled; integral proportion control is conducted on the output voltage according to a direct current reference voltage so as to obtain a first compensation current, and the input current is processed to obtain a second compensation current; the first compensation current and the second compensation current are superimposed to obtain the current compensation amount; control signals are generated according to the current compensation amount, the output voltage and the input current, and a switching tube of a PFC unit is controlled according to the control signals so as to adjust the output voltage of the AC-DC convertor. By means of the PFC control method, fluctuation of the output voltage of the AC-DC convertor can be effectively reduced so as to lower current ripple, and the service life of an output end capacitor of the AC-DC convertor is prolonged. The invention further discloses a PFC control device of the AC-DC convertor in the air conditioner and the air conditioner.
Description
technical field [0001] The present invention relates to the technical field of PFC (Power Factor Correction, power factor correction), in particular to a PFC control method for an AC-DC converter in an air conditioner, a PFC control device for an AC-DC converter in an air conditioner, and a An air conditioner having the PFC control device. Background technique [0002] As a large number of power electronic products are connected to the grid, a large amount of harmonic current is generated on the grid, and a large amount of harmonic current will cause great harm to the power system. With the continuous promotion of frequency conversion air conditioners, the harmonics of air conditioners and the power factor of air conditioners must meet certain standards. [0003] At present, air conditioners generally use single-rotor compressors. Due to the relatively large load torque fluctuations, the DC side voltage of the single-rotor compressors will fluctuate greatly, and there will ...
Claims
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IPC IPC(8): H02M1/42H02M7/217
CPCY02B70/10
Inventor 陈毅东
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD