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An improved single-cycle PFC controller and its control method

A single-cycle, controller technology that is applied in the direction of control/regulation systems, instruments, and adjustment of electrical variables, etc., to achieve the effect of simple use and expanded application range

Active Publication Date: 2021-01-15
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Existing single-cycle control chips, such as IR1155, IR1150, ICE2PCS01, etc., are only suitable for the single-cycle PFC balance equation shown in formula (1), such as Boost PFC converters, interleaved parallel Boost PFC converters, etc. -Boost, Fly-back (flyback), Current-fed (feedforward) and other types of PFC converters, due to the difference in single-cycle PFC balance equations, the existing single-cycle control chips are no longer applicable

Method used

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  • An improved single-cycle PFC controller and its control method
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Embodiment

[0054] In order to verify the effectiveness of the scheme of the present invention, the TI-Boost PFC converter is taken as the control object, and the experimental simulation is carried out.

[0055] (1) OK figure 2 The steady-state voltage gain of the DC converter module in the shown TI-Boost PFC converter is:

[0056]

[0057] in where N p is the number of primary turns of the coupled inductor in the TI-Boost PFC converter, N s is the number of turns of the secondary side of the coupled inductor. In this embodiment, n=2, and D is the duty ratio of the control signal of the switching device of the DC converter module.

[0058] (2) Adjust the proportional coefficient g of the proportional circuit (S21) according to the steady-state voltage gain comp for:

[0059]

[0060] where g DC is the proportional coefficient of the internal proportional circuit (S11) of the classic single-cycle PFC controller (S1).

[0061] (3) Send the sampled output current signal of th...

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Abstract

The invention discloses an improved single-cycle PFC controller and its control method. On the basis of not changing the internal structure and parameters of the classic single-cycle PFC controller, a proportional circuit, a filter circuit and an adding circuit are added outside the controller. The proportional coefficient of the proportional circuit and the parameters of the filter circuit realize the purpose of correcting power factors of different converters. The invention can perform power factor correction on various types of PFC converters, and expands the application range of existing single-cycle PFC control chips.

Description

technical field [0001] The invention belongs to the field of power converter control, and in particular relates to an improved PFC converter and a control method thereof. Background technique [0002] Single-cycle control technology (One-Cycle Control) is a large-signal nonlinear control method proposed by Smedley K.M. in the United States in recent years. This is a novel control technology, which was first used in DC-DC converters. The basic idea of ​​control is to control the duty cycle of the switch in the circuit, so that the average value of the switch variable in each cycle is equal to or proportional to the control reference quantity. The transient error is automatically eliminated in one switching cycle, so that the error of the previous cycle will not be carried to the next cycle. Single-cycle control has the characteristics of fast response, good robustness and adaptability. In recent years, single-cycle control has been widely used in PFC technology. [0003] W...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/00H02M1/42
CPCH02M1/42H02M3/00H02M1/0003Y02B70/10
Inventor 姚佳江平郑凯升季振东嵇保健
Owner NANJING UNIV OF SCI & TECH