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

Quasi-single-stage power factor correction circuit

A power factor correction, quasi-single-stage technology, used in output power conversion devices, DC power input to DC power output, electrical components and other directions, can solve problems such as increasing system costs, unable to solve bus voltage VB, etc. Low cost, reduced number of passive components, and simple circuit structure

Pending Publication Date: 2022-08-05
HANGZHOU DIANZI UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The quasi-single-stage (interleaved Boost+LLC) AC / DC can be used for high input voltage through the pre-stage interleaved Boost PFC, but two independent inductors and two additional diodes greatly increase the system cost
At the same time, none of the above three converters can solve the bus voltage V B too high problem

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
  • Quasi-single-stage power factor correction circuit
  • Quasi-single-stage power factor correction circuit
  • Quasi-single-stage power factor correction circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0033] On the contrary, the present invention covers any alternatives, modifications, equivalents and arrangements within the spirit and scope of the present invention as defined by the appended claims. Further, in order to give the public a better understanding of the present invention, some specific details are described in detail in the following detailed description of the present invention. The present invention can be fully understood by those skilled in the art without the description of these detailed parts.

[0034] refer to Figure 5 , Figure 5 The quasi-single-stage power fa...

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 a quasi-single-stage power factor correction circuit which comprises a PFC circuit and a DC / DC circuit of LLC. Wherein two power tubes of the PFC circuit and the DC / DC circuit of the LLC share one power tube; the PFC circuit comprises a clamping capacitor, a coupling inductor, a boost main inductor, a full-bridge rectifier circuit and three power switch tubes; according to the invention, the power factor is greater than 0.99 by utilizing the capability that the input current automatically tracks the input voltage envelope of the staggered Boost which works in a DCM mode and has a fixed duty ratio of 0.5; the coupling inductor is used for filtering switch ripples; the midpoint of the clamping capacitor and the midpoint of the half-bridge are connected through a switching tube, and the switching tube can adjust the output voltage of the PFC, so that the circuit works under a light load condition. The circuit structure is simple, the circuit cost is low, the control circuit is simple, and the power factor of an input signal is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and relates to a quasi-single-stage power factor correction circuit. Background technique [0002] Since power electronic devices and other related electrical equipment are connected to the power grid, harmonic currents will be generated due to their nonlinear characteristics. The injection of harmonic currents into the power grid will cause distortion of the utility voltage waveform. In order to suppress current harmonics, power factor correction (PFC) must be added. ) circuit. [0003] In the prior art such as figure 1 , figure 2 , image 3 , Figure 4 As shown, the boost power factor correction topology (Boost PFC) is widely used because its input current has the ability to track the input voltage envelope when it operates in discontinuous mode or critical mode. At present, the converters that extend other circuits based on Boost PFC to realize the power factor correctio...

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
Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42H02M3/335H02M1/12H02M1/44
CPCH02M1/4208H02M3/3353H02M1/126H02M1/44Y02B70/10
Inventor 吴琪峰何远彬杭丽君何震
Owner HANGZHOU DIANZI UNIV