Power factor correction (PFC) conversion control method for low output voltage ripple and device thereof

A technology of power factor correction and low output voltage, which is applied in the field of PFC converter working methods and devices, can solve the problems of large DC output voltage ripple, low efficiency, and high cost of converter design, and reduce the DC output voltage ripple. Wave, improve efficiency, improve the effect of cut-off frequency

Inactive Publication Date: 2012-07-04
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the cut-off frequency of the DC output voltage feedback control loop of the traditional active power factor correction converter is low (generally only 10-20Hz), which seriously affects the dynamic response capability of the power factor correction converter to load changes.
In addition, since the DC output voltage ripple of the active power factor correction converter is relatively large, it is necessary to connect a DC-DC converter to the output terminal of the power factor correction converter after connecting an output capacitor with a large capacitance value. Improve the steady-state accuracy of the load DC output voltage and the dynamic response to load changes, making the converter design cost high and low efficiency

Method used

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  • Power factor correction (PFC) conversion control method for low output voltage ripple and device thereof
  • Power factor correction (PFC) conversion control method for low output voltage ripple and device thereof
  • Power factor correction (PFC) conversion control method for low output voltage ripple and device thereof

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Embodiment 1

[0054] figure 2 It is shown that a specific embodiment of the present invention is a control method of a switching power supply, and its specific method is:

[0055] Input voltage detection circuit VC 1 Detect the rectified input voltage V of the single-phase Boost PFC converter in , input voltage RMS detection circuit VC 2 Detect the effective value of the rectified input voltage V of the single-phase Boost PFC converter rms , the output voltage detection circuit VC 3 Detect the DC output voltage V of the load R o , the inductor current sense circuit IC 1 Detection of single-phase Boost PFC converter inductor current I L . DC output voltage V o Send error amplifier VA 1 , error amplifier VA 1 With a DC reference voltage V DC-ref vs. DC output voltage V 0 Comparing produces an error voltage value ΔV DC ;Error voltage value ΔV DC Compensation Network CN 1 regulation is then multiplied by the rectified output voltage V in As an input to the divider, the divider di...

Embodiment 2

[0074] Figure 15 It is shown that, compared with Embodiment 1, this example differs in that: the output voltage of the single-phase Boost PFC converter is sampled, and the output voltage ripple of the single-phase Boost PFC converter is obtained after the DC blocking circuit ID is blocked, and This is used as the control reference signal voltage V of the single-phase full-bridge inverter AC-ref . The control mode and working process are similar to the first embodiment. It can also be proved by simulation results that it can realize the object of the present invention.

Embodiment 3

[0076] Figure 16 As shown, the difference between this example and the first example is that the PFC converter of the switching power supply is an isolated Boost converter. The control mode and working process are similar to the first embodiment. It can also be proved by simulation results that it can realize the object of the present invention.

[0077] The inventive method can also be used for Buck converter, Cuk converter, forward converter, flyback converter, half-bridge converter, full-bridge converter except the switching power supply that can be used for the Boost PFC converter in the above embodiment. The PFC switching power supply composed of various power circuits such as converter, bridgeless PFC converter, isolated PFC converter, etc., its control strategy is in addition to the average current control strategy of the Boost PFC converter in the above embodiments, and peak current control, Single-cycle control and other PFC converter control strategies. In additi...

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Abstract

The invention discloses a power factor correction (PFC) conversion control method for low output voltage ripple and a device thereof. After a single-phase PFC controller is used for sampling the input voltage, inductive current and output voltage of a single-phase PFC converter, a control signal of the PFC convertor is obtained through a PFC control strategy; and a controller of a single-phase inverter is used for sampling the input voltage and load current of the single-phase PFC converter to obtain a control target signal of the single-phase converter and sampling the alternating-current output voltage of the converter simultaneously, and ripple same-amplitude phase reversion is realized for the alternating-current output voltage of the converter and the direct-current output voltage of the PFC converter by using an inverter double closed-loop control strategy. Due to the adoption of the method and the device, a high power factor is realized, the output power frequency ripple voltage of the single-phase PFC converter is eliminated simultaneously, the dynamic response of a system is improved, and the problems of low efficiency and high cost of the conventional twos-stage PFC converter are solved. The device can be also applied to low-ripple high-PFC AC / DC (Alternating Current / Direct Current) constant current source design.

Description

technical field [0001] The invention relates to power control equipment, in particular to a DC-AC assisted PFC converter working method and device for realizing low output voltage ripple. Background technique [0002] In recent years, power electronics technology has developed rapidly, and power supply technology, which is an important part of the power electronics field, has gradually become a hot spot in application and research. Switching power supply has established its mainstream position in the field of power supply because of its high efficiency and high power density, but there is a fatal weakness when it is connected to the power grid through a rectifier: the power factor is low (generally only 0.45 to 0.75), Moreover, a large number of current harmonics and reactive power will be generated in the grid to pollute the grid. There are two main methods for suppressing harmonics generated by switching power supplies: one is the passive method, that is, using passive fi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/12H02M1/42
CPCY02B70/126Y02B70/10
Inventor 许建平张婓阎铁生高建龙
Owner SOUTHWEST JIAOTONG UNIV
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