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Bifrequency control method of switch power supply and device thereof

A technology of switching power supply and control method, which is applied in the direction of output power conversion device, control/regulation system, electrical components, etc., which can solve the problems of difficult to design EMI filter, fluctuation of working frequency, inapplicability, etc., and achieve enhanced system stability Sex, small electromagnetic interference noise, beneficial to the design effect

Inactive Publication Date: 2009-10-14
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this modulation method changes the input voltage or load, the operating frequency will fluctuate greatly, making it difficult to design an EMI filter
In some applications of electronic equipment sensitive to electromagnetic interference noise, PFM (pulse width modulation) technology will not be applicable

Method used

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  • Bifrequency control method of switch power supply and device thereof
  • Bifrequency control method of switch power supply and device thereof
  • Bifrequency control method of switch power supply and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Technical solution ①:

[0029] figure 1 It is shown that the specific embodiment of the present invention is: a dual-frequency control method and device for a switching power supply, and its controller is mainly composed of a comparator, a pulse generator, a pulse selector and a driving circuit. The output voltage is compared with the reference voltage after the detection device, and the output of the comparator is directly used to control the work of the pulse selector; the pulse generator generates two sets of pulses with different frequencies for the pulse selector to select; the output of the pulse selector passes through the drive circuit Used to control the switching device of the converter, thereby obtaining the desired stable output voltage.

[0030] figure 2 , image 3 The application of dual-frequency control technology in the Buck converter working in discontinuous current mode is given. The pulse generator generates two sets of pulse signals with the sa...

Embodiment 2

[0040] Figure 10 It is shown that, compared with the first embodiment, the power converter of this example is a flyback converter, and the control device is the same as that of the first embodiment. It is also proved by simulation that the output voltage of the flyback converter adopted in the present invention is stable, the dynamic response speed is fast, and the electromagnetic interference (EMI) noise is small.

[0041] In addition to being used to control the two power converters in the above embodiments, the present invention can also be used in Boost converters, Buck-boost converters, Cuk converters, forward converters, half-bridge converters, full-bridge converters, etc. A switching power supply composed of power circuits.

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Abstract

The invention discloses a bifrequency control method of switch power supply and a device thereof. A controller combines two groups of pulses with different frequencies to realize control of a switch convertor according to output state of the switch convertor. The invention is applicable to controlling of switch convertors of various topological structures and has the advantages that the control loop is simple and reliable, free of network compensation, fast speed in transient response and low noise in electromagnetic interference (EMI).

Description

technical field [0001] The invention relates to a dual-frequency control method and device for a switching power supply. Background technique [0002] With the rapid development of power electronics technology, the relationship between power electronic equipment and people's work and life is becoming increasingly close, and electronic equipment is inseparable from a reliable power supply. Compared with the traditional linear regulated power supply, the switching power supply has the advantages of high efficiency and small size, which makes the switching power supply technology gradually become a hot spot in people's application and research. The rapid development of power electronic devices provides a large development space for switching power supplies, making them develop in the direction of small size, light weight, high efficiency, and high power density, which has attracted widespread attention from the industry and has broad application prospects. . In the 1980s, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155
Inventor 许建平王金平秦明周国华吴松荣牟清波
Owner SOUTHWEST JIAOTONG UNIV
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