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

Pseudo-continuous conduction mode switching converter constant freewheeling duty cycle control method and device

A pseudo-continuous conduction, mode switching technology, applied in output power conversion devices, conversion equipment without intermediate conversion to AC, electrical components, etc., can solve problems such as the limitation of the load range of the converter, and achieve enhanced stability and dynamic response. capability, guaranteed steady-state performance, improved transient performance and efficiency

Active Publication Date: 2017-11-14
SOUTHWEST JIAOTONG UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The freewheeling control of the traditional PCCM switching converter adopts the constant-reference-current control (Constant-Reference-Current, CRC) method, which has a significant impact on the efficiency of the converter under light-load conditions. If the efficiency is low, the freewheeling current value needs to be reduced, but after reducing the freewheeling current value, the load range of the converter will be limited

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
  • Pseudo-continuous conduction mode switching converter constant freewheeling duty cycle control method and device
  • Pseudo-continuous conduction mode switching converter constant freewheeling duty cycle control method and device
  • Pseudo-continuous conduction mode switching converter constant freewheeling duty cycle control method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] figure 1It is shown that a specific embodiment of the present invention is: a pseudo-continuous conduction mode switching converter constant current duty ratio control device, which is mainly composed of a voltage detection circuit VS, an error amplifier EA, a first trigger RS1, a second trigger RS2, a comparator CMP, a conduction timer TON, a clock signal CLK, a first driving circuit DR1 and a second driving circuit DR2. The voltage detection circuit VS is used to detect the output voltage V o value; the error amplifier EA is used to reference the voltage V ref and the output voltage V o The difference signal is amplified to generate the control voltage V e ;Comparator CMP is used to compare the output voltage V o and control voltage V e The size of the first flip-flop RS1 generates a reset signal; the first flip-flop RS1 is used to obtain the pulse signal V p1 , through the first drive circuit DR1 to control the turn-on and turn-off of the main switch tube; the ...

Embodiment 2

[0046] Such as Figure 8 As shown, this example is basically the same as the first example, except that the converter TD controlled in this example is a PCCM single-ended forward converter.

[0047] In addition to the switching converters in the above embodiments, the present invention can also be used in PCCM converter topologies such as PCCM half-bridge converters and PCCM full-bridge converters.

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 constant current duty cycle control method and device for a pseudo-continuous conduction mode switching converter, which is generated by an error amplifier by comparing the ripple voltage signal on the equivalent series resistance of the output capacitor with the output voltage and the reference voltage The error signal completes the control of the main switching tube of the pseudo-continuous conduction mode switching converter to realize the voltage stabilization of the output voltage; the dynamic freewheeling of the inductor current is realized by controlling the freewheeling switch tube with a constant freewheeling duty ratio. The invention can make the pseudo-continuous conduction mode switching converter have the advantages of simple control, good stability, wide load range, small light-load output voltage ripple, fast input and load transient response speed, high full-load efficiency, and the like.

Description

technical field [0001] The invention relates to a control method of a switching converter and a device thereof, in particular to a control method of a constant-flow duty ratio of a pseudo-continuous conduction mode switching converter and a device for realizing the constant-flow duty ratio control method. Background technique [0002] In recent years, with the development of power electronic device technology and power electronic converter technology, switching power supply has been widely used in industry, transportation, communication, etc. , IT and defense and other fields. [0003] Depending on the selection of circuit parameters, the traditional switching converter will have two operating modes, namely: inductor current continuous conduction mode (continuous conduction mode, CCM) and inductor current discontinuous conduction mode (discontinuous conduction mode, DCM). Working in CCM mode, switching converters can deliver more energy to supply loads, and are widely used ...

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): H02M3/10H02M1/08H02M1/14
Inventor 周国华李振华冷敏瑞刘啸天
Owner SOUTHWEST JIAOTONG UNIV