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Fuzzy single-cycle control method with nonlinear inductor PFC circuit

A single-cycle control, non-linear technology, applied in the direction of high-efficiency power electronic conversion, electrical components, climate sustainability, etc., can solve the problem that the parameters of the single-cycle control system cannot automatically follow the change of nonlinear inductance, etc., to achieve good sensitivity and Effect of Steady-state Output Characteristics

Pending Publication Date: 2018-04-27
FUZHOU UNIV +1
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Problems solved by technology

[0005] The object of the present invention is to provide a kind of fuzzy single-cycle control method that contains nonlinear inductance PFC circuit, this method has considered the non-linearity of filter inductance, and designs corresponding fuzzy single-cycle controller; Automatically follow the problem of nonlinear inductance changes, with good sensitivity and steady-state output characteristics

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  • Fuzzy single-cycle control method with nonlinear inductor PFC circuit
  • Fuzzy single-cycle control method with nonlinear inductor PFC circuit
  • Fuzzy single-cycle control method with nonlinear inductor PFC circuit

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Embodiment Construction

[0041] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0042] A kind of fuzzy single-cycle control method of PFC circuit containing nonlinear inductance of the present invention provides a bidirectional switching PFC circuit containing nonlinear inductance, comprising the following steps,

[0043] 1) Assuming that the inductor current is continuous in the nth switching cycle, the relationship between its input and output voltage and the switch on and off can be expressed as follows:

[0044]

[0045]

[0046] Among them, V in (n) is the input voltage of the nth switching cycle, V o is the output reference voltage;

[0047] The inductor current during the nth switching cycle can be expressed as

[0048] i L (n+1)=i L (n)+Δi (3)

[0049] Among them, Δi is the amount of change in the inductor current of the n+1th switching cycle relative to the nth switching cycle;

[0050] 2) From th...

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Abstract

The invention relates to a fuzzy single-cycle control method with a nonlinear inductor PFC circuit. Single-cycle control is widely used in PFC circuit design because single-cycle control has the characteristic of given tracking in each switching cycle. The inductance in a single-cycle algorithm is calculated as a fixed value, and the inductance of an inductor changes with the change of current. The single-cycle control effect fails to meet desired requirements, and a new control policy is needed. In view of the nonlinear inductor, the invention proposes the fuzzy single-cycle control algorithm. The problem of system performance deterioration caused by changes in the inductance in original single-cycle control is effectively solved. The digital control structure of the bidirectional switching PFC is simplified. The control effect of the system is improved.

Description

technical field [0001] The invention belongs to the technical field of power factor correction application and related control technology of an electric energy conversion device, and in particular relates to a fuzzy single-cycle control method of a PFC circuit containing a nonlinear inductance. Background technique [0002] With the development of bridgeless PFC technology, in addition to the extensive research on its circuit topology, the research on its control strategy is also a hot spot. As for the research on the bridgeless PFC control algorithm, the current literature mainly focuses on the design of the current inner loop, and one of the commonly used algorithms is single-cycle control. OCC (One Cycle Control), which belongs to a nonlinear switch control technology, has the characteristics of simple control method, fast dynamic response, high control precision and strong robustness. It controls the duty cycle of the switch, The average value of the switching variable ...

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4208Y02B70/10
Inventor 林琼斌洪乙铭蔡逢煌苏先进王武柴琴琴
Owner FUZHOU UNIV
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