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A method of variable conduction time control for crm flyback pfc converter

A technology of changing on-time and on-time, which is applied in the control/regulation system, DC power input conversion to DC power output, instruments, etc. It can solve the problem of increasing input current THD and it is difficult for CRM flyback PFC converter to meet harmonic Wave standards, difficult to meet harmonic requirements and other issues

Active Publication Date: 2019-04-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some occasions with high requirements on input current harmonics, it is difficult to meet the relevant harmonic requirements even with the existing variable on-time control method
[0005] With the increase of the switching frequency range of the CRM flyback PFC converter, the influence of the CRM flyback PFC converter on the input current distortion in the actual resonance stage is more obvious, which is manifested by a large increase in the input current THD. control method, it is also difficult to make the CRM flyback PFC converter meet the corresponding harmonic standards

Method used

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  • A method of variable conduction time control for crm flyback pfc converter
  • A method of variable conduction time control for crm flyback pfc converter
  • A method of variable conduction time control for crm flyback pfc converter

Examples

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Embodiment 1

[0083] The present invention controls the variable conduction time of the CRM flyback PFC converter under the condition of fixed input

[0084] figure 1 It is the control flowchart of the variable conduction time of the CRM flyback PFC converter under the fixed input condition of the present invention. image 3 It is an embodiment of the variable on-time control method of the CRM flyback PFC converter proposed in the present invention under a fixed input condition.

[0085] It is known that the input and output parameters of the CRM flyback PFC converter in this example are 220VAC / 50Hz, and the rated full-load power is P o =64W, output voltage V o =24V. It is known that the transformer primary side excitation inductance L of the CRM flyback PFC converter in this example m =300μH, the primary and secondary side turn ratio n=4, the primary side switching tube output junction capacitance C ds =313pF, secondary diode parasitic capacitance C j =50pF.

[0086] Select 101 mome...

Embodiment 2

[0105] The present invention controls the variable conduction time of the CRM flyback PFC converter under the general input condition

[0106] attached Figure 9 It is an embodiment of the variable on-time control method of the proposed CRM flyback PFC converter under the general input conditions (90-264VAC, 47Hz-63Hz). It is known that the input and output parameters of the CRM flyback PFC converter in this example are: 90V ~ 264VAC RMS input, 47Hz ~ 63Hz power frequency, output voltage V o =24V, rated full load power P o = 64W. In this example, the inductance value L of the magnetizing inductance of the primary side of the transformer is m =300μH, the primary and secondary side turn ratio n=4, the primary side switching tube output junction capacitance C ds =313pF, secondary diode parasitic capacitance C j =50pF.

[0107] In order to simplify the design, this example selects several RMS input line voltage calculations corresponding to the variable conduction time data ...

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Abstract

The invention provides a variable turn-on time control method of a CRM fly-back PFC (Power Factor Correction) converter, and belongs to the field of AC-DC power conversion. The proposed control method considers the influence of a resonant stage in the actual work of the CRM fly-back PFC converter, and uses an output signal of a voltage error adjuster to carry out real-time transformation on a single stored variable turn-on time data table, so that the CRM fly-back PFC converter performs adaptive variable turn-on time control under a variable load condition, thereby obviously reducing the input current THD (Total Harmonics Distortion) in a full load range.

Description

technical field [0001] The invention relates to a variable conduction time control method suitable for a CRM flyback PFC converter, belonging to the technical scope of power conversion, in particular to the technical field of high-quality AC-DC power conversion. Background technique [0002] In recent years, power electronic devices have been widely used in rectification occasions, which has caused increasingly serious current harmonic pollution problems. In order to reduce the harm of current harmonics caused by power electronic devices, various harmonic standards promulgated have carried out the power factor (Power Factor, PF) and current total harmonic distortion (Total Harmonics Distortion, THD) that power electronic devices need to meet. Regulation. Flyback (Fly-back) power factor correction (Power Factor Correction, PFC) converters are widely used in various adapter power supplies. Generally, it can be divided into three types: transformer primary and secondary curre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/42
CPCH02M1/4241H02M3/33515Y02B70/10Y02P80/10
Inventor 任小永郭哲辉吴羽陈乾宏张之梁
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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