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Interleaved PFC current control method, control circuit and variable frequency air conditioner

A technology of current control circuit and frequency conversion air conditioner, which is applied in the field of power supply, can solve the problems of two-way current imbalance, reduce the probability of damage, achieve precise PFC control, and improve the reliability of the circuit

Inactive Publication Date: 2019-07-30
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of unbalanced two-way current in the prior art, the present invention proposes an interleaved PFC current control method, a control circuit and an inverter air conditioner that can automatically balance the two-way current

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  • Interleaved PFC current control method, control circuit and variable frequency air conditioner
  • Interleaved PFC current control method, control circuit and variable frequency air conditioner
  • Interleaved PFC current control method, control circuit and variable frequency air conditioner

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention more clear, 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.

[0022] The present invention aims to solve the problem of unbalanced currents in the two circuits of the interleaved PFC, can automatically balance the two currents within the allowable range, and can stop protection in time when it exceeds the allowable range, thereby reducing the probability of damage to the PFC circuit.

[0023] figure 1 Shown is an interleaved PFC topology diagram. The rectifier bridge on the left side of the figure converts AC into DC, and the DC output is on the DC bus. The far right side of the figure is the load Load. The first branch and the second branch are connected...

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Abstract

The invention discloses an interleaved PFC current control method, a control circuit and a variable frequency air conditioner. The interleaved PFC current control method comprises the following steps:sampling a first branch current IL1 and a second branch current IL2 in an interleaved PFC circuit, and performing feedback control on the first branch current IL1 and the second branch current IL2 according to the difference value of the two currents so as to make the two currents trend to balance; according to the interleaved PFC current control method, the control circuit and the variable frequency air conditioner, the problem that the two interleaved PFC currents are unbalanced is effectively solved; the two currents can be balanced automatically within an allowable range, and shutdown protection can be performed in time beyond the allowable range, so that the probability of the damage of a PFC circuit is reduced; the PFC control is more accurate; and the reliability of the circuit isimproved.

Description

technical field [0001] The invention relates to a power supply, in particular to an interleaved power factor correction (PFC) current control method, a control circuit and an inverter air conditioner. Background technique [0002] Interleaved PFC is a common PFC topology at present, which consists of two boost circuits connected in parallel on the DC bus. Ideally, the two boost circuits should have equal currents flowing through them. Compared with the traditional single-phase PFC, this topology has the advantages of small inductance, small input current ripple, and good EMC effect. In actual engineering circuits, the currents flowing through the two paths are often not equal, due to differences in inductance values, different control duty ratios of the two paths, damage to the inductor of one path, etc. Long-term operation may cause the branch with a large current to Corruption occurs. [0003] Therefore, how to design a control method that can automatically balance the ...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/32
CPCH02M1/32H02M1/42H02M1/0003H02M1/0009Y02B70/10
Inventor 何幸贺小林刘文斌李洋
Owner GREE ELECTRIC APPLIANCES INC