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One-cycle control method applied to bridgeless SEPIC-PFC (single-ended primary-inductor converter-power factor correction) circuit

A single-cycle control and circuit technology, applied in the field of control, can solve the problem of no bridge-type SEPICPFC circuit, etc.

Inactive Publication Date: 2015-05-20
DALIAN UNIV OF TECH
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, there are almost no applications in bridgeless SEPIC PFC circuits operating in discontinuous conduction mode (DCM).

Method used

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  • One-cycle control method applied to bridgeless SEPIC-PFC (single-ended primary-inductor converter-power factor correction) circuit
  • One-cycle control method applied to bridgeless SEPIC-PFC (single-ended primary-inductor converter-power factor correction) circuit
  • One-cycle control method applied to bridgeless SEPIC-PFC (single-ended primary-inductor converter-power factor correction) circuit

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Embodiment Construction

[0043] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0044] (1) Construction of the integrator

[0045] To construct a quadratic function about the duty ratio D, two integrators are used in the construction, that is, the first-stage integrator and the second-stage integrator. In the actual circuit, the LF412 chip and the corresponding resistors and capacitors can be used to form an integrator. According to the principle of single-cycle control applied in DCM circuits, it is assumed that the output of the first-stage integrator is: The output of the second stage integrator is: Where t is the integration time; V c is the output value after the error between the output voltage and the reference value is adjusted by PI; by adjusting the parameters, the output of the second-stage integrator can be D 2 the expression.

[0046] Duty cycle squared D 2 The cal...

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Abstract

The invention belongs to the field of control, and discloses a one-cycle control method applied to a bridgeless SEPIC-PFC (single-ended primary-inductor converter-power factor correction) circuit. The invention is intended to apply the one-cycle control technique in the novel bridgeless SEPIC-PFC circuit, so that output response is faster and output voltage is more stable while the circuit achieves the objective of power factor correction. The process of implementing one-cycle control is as follows: input current, input voltage and output voltage are sampled to construct a duty cycle square, an output voltage error is compared with the duty cycle square after passing through a PI (proportional-integral) regulator and a resetting integrator, and a post-comparison output result passes through a RS (reset-set) trigger, so that a PWM (Pulse-Width Modulation) pulse sequence is outputted to control the on-off of a switch in the main circuit. The one-cycle control method has the advantage that by applying the one-cycle control method in the highly practical DCM (Discontinuous Conduction Mode) bridgeless SEPIC-PFC circuit, the circuit can achieve the effect of power factor corrosion, and thereby output is more stable.

Description

technical field [0001] The invention belongs to the field of control and is mainly used for controlling a novel bridgeless SEPIC (single-ended primary-inductor converter) PFC (power factor correction) circuit. Background technique [0002] Many power electronic devices we use every day use switching power supplies. At present, most switching power supply structures on the market are composed of rectifier bridges and DC-DC circuits. Due to the existence of the rectifier bridge, the switching power supply injects a large amount of harmonics and reactive power into the grid, which affects the power quality of the grid. In order to solve this problem, many scholars at home and abroad are devoted to the research of bridgeless power factor correction circuit. In recent years, a variety of new bridgeless PFC circuit structures based on SEPIC circuits have emerged, because SEPIC circuits have many advantages, such as: it is easy to achieve transformer isolation, and its inherent a...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/42H02M1/0003Y02B70/10
Inventor 李冠林邱金燕牟宪民陈希有刘凤春王喆孙恩泽
Owner DALIAN UNIV OF TECH
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