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

Soft switching control circuit of totem pole pfc rectifier

A control circuit and rectifier technology, applied in the control field of power electronics and power electronic converters, can solve the problem of high hardware cost, achieve simple control logic, improve power conversion efficiency, and reduce hardware cost

Active Publication Date: 2021-12-07
HOHAI UNIV
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this control strategy needs to accurately calculate the delay time of each switching cycle, and still needs a high-precision inductor current zero-crossing detection (ZCD) circuit, and the hardware cost is relatively high

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
  • Soft switching control circuit of totem pole pfc rectifier
  • Soft switching control circuit of totem pole pfc rectifier
  • Soft switching control circuit of totem pole pfc rectifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] The soft switch control circuit of the totem pole PFC rectifier that the present invention relates to, such as Figure 4 shown. The totem pole PFC rectifier includes the AC power V ac , Totem pole PFC rectifier circuit 2, output bus capacitor 3, an input filter inductor L f , a coupling inductor with the same name L 1 , an input filter capacitor C f and a load resistor R. The control circuit includes a zero voltage turn-on detection circuit 1 and a soft switch control circuit 4 . The zero voltage turn-on detection circuit 1 includes a capacitor, four diodes, two resistors, a coupled inductor and a comparator; the soft switch control circuit 4 includes two voltage sensors, a current sensor, and a comparator, Three adders, four subtractors, four multipliers, two dividers, one current regulator, one voltage regulator, three propor...

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 novel modulation strategy of a totem pole power factor correction (PFC) converter, and belongs to the technical field of control of power electronic converters. This modulation strategy makes the converter work in the critical conduction mode, and the zero-voltage conduction of the switch tube can be realized in the whole grid cycle. The modulation uses a simple PI controller and auxiliary control circuit to calculate the turn-on time of the switch tube, uses the principle of inductor voltage volt-second balance to calculate the turn-off time of the switch tube, and uses the CR differential circuit to perform adaptive adjustment of the switch cycle. A full range of zero-voltage conduction of the switching tube is realized. The modulation scheme eliminates the high-cost zero-crossing detection circuit, has the advantages of simple control and easy implementation, is conducive to the high power density of the rectifier, and has broad application prospects in the field of power electronic converters.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to the technical field of control of power electronic converters, and in particular relates to a soft switch control circuit of a totem pole PFC rectifier. Background technique [0002] The totem pole PFC rectifier is widely used in aviation power supply, electric vehicle charging and other fields due to its advantages of high reliability, high efficiency and low current harmonic distortion. A totem pole PFC rectifier whose topology is as follows figure 1 shown. When using traditional SPWM modulation, the inductor current is in continuous conduction mode (CCM), and there is a large switching loss on the switch tube. When the switching frequency increases, it will seriously affect the power conversion efficiency of the converter. [0003] When the converter inductor current is in critical conduction mode (CRM), the switching tube that makes the inductor current rise can r...

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 Patents(China)
IPC IPC(8): H02M1/42
CPCH02M1/4233H02M1/4241Y02B70/10
Inventor 郑仲舒张犁邹宇航娄修弢吴超王一鸣
Owner HOHAI UNIV