Current sharing control method and device for interleaved parallel PFC circuit and air conditioner

A flow control and circuit technology, which is applied to the current equalization control method of interleaved parallel PFC circuits, devices and air conditioners, can solve the problems of uneven current flow in PFC circuit branches, and achieve reliable operation status Effect

Inactive Publication Date: 2020-01-10
NINGBO AUX ELECTRIC +1
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  • Abstract
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Problems solved by technology

[0003] In order to solve the technical problem of unbalanced flow in the branches of the interleaved parallel PFC circuit, the present ...

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  • Current sharing control method and device for interleaved parallel PFC circuit and air conditioner
  • Current sharing control method and device for interleaved parallel PFC circuit and air conditioner
  • Current sharing control method and device for interleaved parallel PFC circuit and air conditioner

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Embodiment Construction

[0053] In order to make the above objects, features and advantages of the present invention more comprehensible, specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0054] Such as figure 1 As shown, the interleaved parallel PFC circuit can include two Boost-type PFC branches symmetrically arranged, and each PFC branch includes an inductor, a diode and a switching tube, and the switching tubes in the two branches are respectively T1 and T2. Each PFC branch switch operates in a 180° interleaved state, each bearing half of the total output power of the interleaved parallel PFC circuit. Since the parameters of the corresponding components in the two PFC branches may be different and discrete, the inductor current in each PFC branch will be uneven, resulting in unbalanced power distribution, which will affect the stable operation of air conditioners and other equipment.

[0055] Such as figure 2 As sho...

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Abstract

The invention provides a current sharing control method and device for an interleaved parallel PFC circuit and an air conditioner. The interleaved parallel PFC circuit comprises two symmetrically arranged PFC branches. The method comprises the following steps: acquiring the actual bus voltage, the target bus voltage and the total current of the interleaved parallel PFC circuit and the branch current of any PFC branch; obtaining the initial PWM signal having an initial duty cycle according to the actual bus voltage, the target bus voltage and the total current; and obtaining the current sharingPWM signal for driving the switching tubes of the two PFC branches according to the initial PWM signal and the branch current. The technical scheme can simply and effectively solve the problem of uneven current of the branches of the interleaved parallel PFC circuit and ensure that electrical appliances such as the air conditioner are in a reliable operation state.

Description

technical field [0001] The present invention relates to the technical field of air conditioners, in particular to a method and device for controlling current sharing of interleaved parallel PFC circuits and an air conditioner. Background technique [0002] The interleaved parallel PFC circuit is widely used in inverter air conditioners and other equipment, which has the characteristics of small input current and output current ripple, and small branch power level. The interleaved parallel PFC circuit not only needs to ensure that the total input current is in phase with the input voltage, but also needs to meet the requirement of inductive current sharing in each branch. However, due to the differences and discreteness of the parameters of the components between the two power branches in actual use, the inductance current of each branch will be unequal, which will lead to an unbalanced distribution of the total power between the two branches. It even appears that the total ...

Claims

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Application Information

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IPC IPC(8): H02M1/42H02M1/08F24F11/88
CPCF24F11/88H02M1/08H02M1/4208Y02B70/10
Inventor 李超游剑波
Owner NINGBO AUX ELECTRIC
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