Frequency soft clamp system for quasi-resonant switching power supply and method

A technology of switching power supply and switching frequency, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc. It can solve the problems of easy generation of audio noise, generation of audio frequency spectrum components, and drastic changes in switching frequency, so as to avoid audio noise Effect

Active Publication Date: 2012-09-19
佛山市南海赛威科技技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, this kind of quasi-resonant switching power supply controller using traditional hard clamp frequency control is very easy to turn on two adjacent valleys in turn when clamping frequency (such as image 3 As shown), the switching frequency changes drastically, resulting in the spectral components of the audio frequency, so it is easy to generate audio noise

Method used

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  • Frequency soft clamp system for quasi-resonant switching power supply and method
  • Frequency soft clamp system for quasi-resonant switching power supply and method
  • Frequency soft clamp system for quasi-resonant switching power supply and method

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Embodiment 1

[0091] The invention discloses a frequency soft clamping system for a quasi-resonant switching power supply. By detecting the switching frequency within a certain time range (such as including one or more time periods), the next time range (such as including one or more time periods) is selected to select the next time range (such as including one or multiple time periods, which can be the same as or different from the detected time range), the power switch is locked at a certain valley conduction, so as to achieve the purpose of limiting the switching frequency to a certain range and locking at a certain valley conduction within a certain period of time .

[0092] see Figure 4 , the frequency soft clamping system includes a valley detector, a valley selection controller, and a power switch opening trigger signal generator. Among them, the valley detector is used to detect the valley bottom of the free LC resonance waveform of the main inductance and the parasitic capacitanc...

Embodiment 2

[0098] see Figure 5 , Figure 5 It is a specific embodiment according to the idea of ​​the present invention. The frequency soft clamping system for a quasi-resonant switching power supply includes: an oscillator, a frequency comparator-L, a frequency comparator-H, a bidirectional counter, a valley detector, and a power switch open trigger signal generator.

[0099] The oscillator provides the clock signal for the bi-directional counter. The frequency comparator-L is used to determine whether the frequency of the Gate port is lower than f_ref_L. The frequency comparator-H is used to judge whether the frequency of the Gate port is higher than f_ref_H. The Gate port is a drive signal output port, used to drive the power switch, and control the power switch to be turned on and off. According to the output of the frequency comparator-H and the frequency comparator-L, the soft-clamp bidirectional counter starts its output to add or subtract one in each clock cycle; if it is re...

Embodiment 3

[0108] Image 6 It is another specific embodiment according to the idea of ​​the present invention. The frequency soft clamping system for quasi-resonant switching power supply includes: N frequency divider, frequency comparator-L, frequency comparator-H, bidirectional counter, valley detector, power switch open trigger signal generator.

[0109] The N-time frequency divider performs N-time frequency division on the input signal of the Gate port, and the frequency-division output signal serves as a bidirectional counter to provide a clock signal. The Gate port is a drive signal output port, used to drive the power switch, and control the power switch to be turned on and off. Frequency comparator-L is used to judge whether the frequency of Gate is lower than f_ref_L. Frequency comparator-H is used to judge whether the frequency of Gate is higher than f_ref_H. According to the output of the frequency comparator-H and the frequency comparator-L, the soft-clamp bidirectional co...

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Abstract

The invention discloses a frequency soft clamp system for a quasi-resonant switching power supply and a method. The system is used for selecting a certain valley bottom where a power switch within a subsequent set time range is locked for switch-on through detecting the switching frequency within a set time range to achieve the effects that the switching frequency is limited within a certain range, and the power switch is locked in the certain valley bottom for switch-on within the set time range. The frequency soft clamp system for the quasi-resonant switching power supply and the method, which are disclosed by the invention, have the benefits that the power switch can be effectively prevented from being switched on between adjacent two valley bottoms in turn and is locked in the certain valley bottom for switch on within the certain time range, so that the audio frequency noise is effectively avoided, and the switching frequency is limited within the certain range.

Description

technical field [0001] The invention belongs to the field of integrated circuit technology and relates to a quasi-resonant switching power supply, in particular to a frequency soft clamping system for a quasi-resonant switching power supply; at the same time, the invention also relates to a frequency soft clamping system for a quasi-resonant switching power supply. Clamp method. Background technique [0002] With the miniaturization of electronic equipment and the development of computer, communication and aerospace industries, the requirements for power supply are also increasing. The miniaturization and high frequency of power supply have become the inevitable development trend of power supply. In the process of miniaturization and high frequency of switching power supply, switching loss is an important factor restricting its development. The switching loss of the traditional PWM switching power supply at high frequency makes it impossible to further increase the switchin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/335
Inventor 职春星林官秋叶俊李茂
Owner 佛山市南海赛威科技技术有限公司
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