PFC circuit, motor control system and variable frequency air conditioner
A motor control and circuit technology, applied in the control system, AC motor control, power factor control, etc., can solve the problems of large common mode noise and low conversion efficiency of PFC circuit
Pending Publication Date: 2018-05-18
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Problems solved by technology
[0004] The main purpose of the present invention is to provide a PFC circuit, a motor control system and an inverter air conditioner, the purpose of which is to solve the problems of low conversion efficiency or large common-mode noise in the existing PFC circuit
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[0049] 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.
[0050] refer to figure 1 , figure 1 The schematic structural diagram of the PFC circuit provided for the first embodiment of the present invention, for the convenience of description, only shows the parts related to the embodiment of the present invention, and the details are as follows:
[0051] The PFC of the embodiment of the present invention is applied to a motor control system, including a reactor L, a rectification unit 4, a current detection unit 3, a filter circuit 7, an AC voltage sampling unit 2, a DC voltage sampling...
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The invention provides a PFC circuit, a motor control system and a variable frequency air conditioner. The motor control system is composed of an electric reactor, a rectifying part, a current detection part, a filtering circuit, an alternating voltage sampling part, a direct voltage sampling part and a computing control part, wherein the rectifying part is composed of a rectifying unit comprisingtwo serial rectifying diodes and a switching unit comprising two switching tubes to form a full wave rectifying circuit, and the rectifying unit is connected with the switching unit in parallel; thecomputing control part comprises a PFC computing control part; and by acquiring the operational DC bus voltage given value of a motor, a PFC duty cycle of switching signal is generated according to ACinput voltage value, DC bus voltage value, AC input current value and the DC bus voltage given value to drive the switching tubes of the rectifying part to work, thereby performing power-factor correction on the input alternating current. Compared with existing PFC circuits, the PFC circuit provided by the embodiment of the invention can effectively improve efficiency and reduce common mode noise, thereby improving the reliability of the whole motor control system.
Description
technical field [0001] The invention relates to the technical field of frequency conversion air conditioners, in particular to a PFC circuit, a motor control system and a frequency conversion air conditioner. Background technique [0002] In order to meet the energy-saving requirements of household appliances, inverter air conditioners have been developed rapidly, and active power factor correction has been widely used in the electronic control part of inverter air conditioners. At present, the power factor correction part of most inverter air conditioners adopts Boost (boost) type circuit. After the current flows through the rectifier bridge, it is supplied to the motor inverter after passing through the inductor and diode. The disadvantage of this type of electronic control is AC-DC (AC-DC) conversion efficiency is low; or a bridgeless PFC (power factor correction) circuit appears, but although this bridgeless PFC circuit improves the AC-DC conversion efficiency to a certa...
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IPC IPC(8): H02M1/42H02P23/26H02P27/08
CPCH02M1/4225H02P23/26H02P27/085Y02B70/10
Inventor 霍军亚段文训
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD