Three-phase power supply conversion circuit, circuit control method, circuit board and air conditioner
A technology for converting circuits and three-phase power supplies, which is applied to circuit control methods, circuit boards, air conditioners, and three-phase power conversion circuits, and can solve the problems of large current harmonics, difficult to meet, and unbalanced three-phase AC power current signals. , to achieve the effect of balancing three-phase current and reducing harmonics
Pending Publication Date: 2022-04-12
CHONGQING MIDEA REFRIGERATION EQUIP CO LTD +1
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However, this also leads to the fact that the load of this phase of driving the DC fan is higher than that of the other two phases, and this part of the increased load does not pass through the two-level active PFC circuit, resulting in significantly larger current harmonics in this phase, and the three-phase AC power supply The current signal is unbalanced, and it is difficult to meet the harmonic requirements of IEC (International Electro technical Commission, International Electrotechnical Commission)
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[0074] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0075] It should be noted that although the functional modules are divided in the schematic diagram of the device, and the logical sequence is shown in the flowchart, in some cases, it can be executed in a different order than the module division in the device or the flowchart in the flowchart. steps shown or described. The terms "first", "second" and the like in the specification and claims and the above drawings are used to distinguish similar objects, and not necessarily used to describe a specific sequence or sequence.
[0076] The invention provides a three-phase power conversion circuit, a c...
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The invention discloses a three-phase power supply conversion circuit, a circuit control method, a circuit board and an air conditioner. The three-phase power supply conversion circuit comprises a rectification module, an energy storage module, a control module and a DC load module. The rectifier module comprises a three-phase rectifier bridge and a bidirectional switch assembly. The energy storage module comprises a first capacitor and a second capacitor; the direct-current load module comprises at least two of a first direct-current load, a second direct-current load and a third load; the control module is used for acquiring a current signal of a three-phase alternating-current power supply, a first capacitor voltage and a second capacitor voltage, and correspondingly outputting a control signal to the bidirectional switch assembly according to at least two of a first target voltage of the first capacitor, a second target voltage of the second capacitor and a third target voltage of the energy storage module; the voltage at the two ends of the corresponding load is kept as the target voltage, the stable voltage can be provided for the corresponding load, the three-phase current of the three-phase alternating-current power supply can be balanced, the harmonic wave of the current of a certain phase is prevented from being obviously large, and the harmonic wave can be effectively reduced.
Description
technical field [0001] The invention relates to the technical field of air conditioners, in particular to a three-phase power conversion circuit, a circuit control method, a circuit board and an air conditioner. Background technique [0002] In the high-efficiency inverter air-conditioning system powered by three-phase power supply, in addition to the inverter compressor load, there is also a DC fan load. Some air-conditioning systems have one DC fan, and some air-conditioning systems have two DC fans or even more. The existing technical solution is generally that the three-phase power supply outputs the high-voltage DC bus voltage after passing through the passive PFC rectifier circuit or the two-level active PFC rectifier circuit, and the load of the inverter compressor is connected to the high-voltage DC bus voltage; while the load of the DC fan is not from Power is taken from the high-voltage DC bus voltage, but it is powered by another independent phase voltage rectific...
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IPC IPC(8): H02M7/219H02M1/12F24F11/88
Inventor 黄招彬龙谭赵鸣杨建宁徐锦清曾贤杰霍兆镜文先仕
Owner CHONGQING MIDEA REFRIGERATION EQUIP CO LTD