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Multi-frequency control method for 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, electrical components, AC power input conversion to DC power output, etc. It can solve the problems of inapplicability of PFM technology, fluctuation of operating frequency, and difficulty in designing EMI filters, etc. problems, to achieve the effect of favorable design, low electromagnetic interference noise, and reduced design difficulty

Inactive Publication Date: 2010-03-31
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 technology will not be applicable

Method used

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  • Multi-frequency control method for switch power supply and device thereof
  • Multi-frequency control method for switch power supply and device thereof
  • Multi-frequency control method for switch power supply and device thereof

Examples

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Embodiment 1

[0031] Technical solution ①:

[0032] figure 1 It is shown that the specific embodiment of the present invention is: a switching power supply multi-frequency control method and its device, and its controller is mainly composed of an error amplifier, an error interval judge, a pulse generating circuit, a pulse selector and a driving circuit. The difference between the output voltage and the reference voltage is made by the detection device, and the difference is amplified by the error amplifier, and then the current error interval is known by the error interval judger, and then used to control the work of the pulse selector; the pulse generation circuit generates Multiple groups of pulses with different frequencies are selected by the pulse picker; the output of the pulse picker is used to control the switching device of the power converter after passing through the drive circuit, thereby obtaining the desired stable output voltage value.

[0033] figure 2 , image 3 The ap...

Embodiment 2

[0044] 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 control of the flyback converter of the present invention is stable and reliable, no compensation network is needed, the output voltage ripple is small, the dynamic response speed is fast, and the electromagnetic interference (EMI) noise is small.

[0045] 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 present invention discloses a multi-frequency control method for switch power supply and a device thereof, which combines multiple groups of impulses having different frequencies as the control signal of a switch converter. The invention can be used for controlling the switch converters having various topology structures, has the advantages of stable and reliable control, no need of compensating network, small output voltage ripple, fast transient response speed, and low electromagnetic interference (EMI) noise.

Description

technical field [0001] The invention relates to a multi-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 linear regulated power supply, the switching power supply has the advantages of high efficiency, small size, and high power density, which makes the switching power supply technology gradually become a hot spot in people's application and research. The switching power supply is mainly composed of two parts: a power converter and a controller. The power converter, also known as the power circuit, mainly includes a switching device, a transformer device and a rectification and filtering circuit. Common power converter topologies include Buck converter, Boost converter, Bu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/525H02M1/32
Inventor 许建平王金平周国华秦明吴松荣牟清波
Owner SOUTHWEST JIAOTONG UNIV
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