Unlock instant, AI-driven research and patent intelligence for your innovation.

Efficient three-phase single-tube DCM Boost PFC converter

A converter and three-phase technology, applied in the field of high-efficiency three-phase single-transistor DCM Boost PFC converters, can solve the problem of increased conduction loss, increased switch tube turn-off loss, large inductor current peak value and effective value, and increased current stress of power devices. problem, to achieve the effect of increasing the critical inductance value, reducing the peak value and effective value of the inductor current, and reducing the current stress

Inactive Publication Date: 2015-06-24
NANJING UNIV OF SCI & TECH
View PDF3 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since it works in discontinuous mode, the energy transmission does not occupy the entire switching cycle, the peak value and effective value of the inductor current of the three-phase single-transistor DCM Boost PFC converter are relatively large, and the same is true for the switch tube and diode, which increases the current stress of the power device. At the same time, it also increases the conduction loss and the turn-off loss of the switch tube, which affects the improvement of efficiency.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Efficient three-phase single-tube DCM Boost PFC converter
  • Efficient three-phase single-tube DCM Boost PFC converter
  • Efficient three-phase single-tube DCM Boost PFC converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] 1 Analysis of three-phase single-transistor Boost PFC converter

[0028] figure 1 Shown is the main circuit of the three-phase single-transistor DCM Boost PFC converter, where L a = L b = L c =L. figure 2 The waveform of the three-phase AC input voltage is given. In the interval [0, π / 6], the waveform of the inductor current of each phase in a switching cycle is as follows image 3 shown.

[0029] Define the three-phase AC input voltage as

[0030] v a =V m sin ωt (1)

[0031] v b =V m sin(ωt-2π / 3) (2)

[0032] v c =V m sin(ωt+2π / 3) (3)

[0033] where V m and ω are the amplitude and angular frequency of the input voltage, respectively.

[0034] Obviously, the three-phase AC voltage and current always satisfy:

[0035] v a +v b +v c =0 (4)

[0036] i a + i b + i c =0 (5)

[0037] figure 2 The waveform of the three-phase AC input voltage is given. In order to facilitate subsequent analysis, a power frequency cycle can be divided into 12 equa...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses an efficient three-phase single-tube DCM Boost PFC converter. The converter comprises a main power circuit and a control circuit, the output end A of a voltage division circuit in the control circuit is connected with the input end of a subtraction circuit, the output end C of an output voltage sampling circuit is connected with the input end of the subtraction circuit and a third input end of a multiplying unit, the output end B of the subtraction circuit is connected with a first input end of the multiplying unit, the output end of an error regulating circuit is connected with a second input end of the multiplying unit, and the output end P of the multiplying unit passes through a PWM IC chip and a switching tube drive sequentially and is connected into a gate pole of a switching tube Qb. According to the efficient three-phase single-tube DCM Boost PFC converter, on the premise that the converter is maintained working in the DCM mode, a critical inductance value is increased to the maximum extent, and an inductance current effective value and a peak value are decreased, so that the breakover losses of main power devices and the turn-off losses of the switching tube are reduced, and the converting efficiency is raised.

Description

technical field [0001] The invention relates to the field of AC-DC converters of electric energy conversion devices, in particular to a high-efficiency three-phase single-tube DCM Boost PFC converter. Background technique [0002] The power factor correction (Power Factor Correction, PFC) converter can reduce the input current harmonics and improve the input power factor, which has been widely used. Recovery, constant switching frequency, simple control, low cost, etc., but when the duty cycle is constant in half the input cycle, the input current harmonic content is relatively large. The input current mainly contains the fifth harmonic with a phase difference of π from the fundamental current, which not only lowers the power factor, but also increases the input power ripple, so the output voltage ripple is high, requiring a larger output energy storage capacitor, and the converter efficiency is lower. Low. Since it works in discontinuous mode, the energy transmission does...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): H02M7/217H02M1/42
CPCH02M1/4225H02M1/0054Y02B70/10
Inventor 姚凯孟庆赛王祎王小平李辉
Owner NANJING UNIV OF SCI & TECH