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Switching power supply as well as ringing elimination circuit and ringing elimination method thereof

A technology for eliminating circuits and switching power supplies, applied to electrical components, adjusting electrical variables, instruments, etc., can solve problems such as electromagnetic interference, reduce system service life, and affect system reliability, so as to reduce costs and save space

Active Publication Date: 2021-02-02
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the discontinuous conduction mode, when the inductor L1 has discharged and the power switch M0 is not turned on, the LC loop formed by the inductor L1 and the parasitic capacitance of the power switch M0 will be between the inductor L1 and the power switch M0 A high frequency oscillation phenomenon will appear at the switch node SW, such as figure 2 As shown, the high-frequency oscillation will form ringing in the circuit, generate electromagnetic interference in the system, affect the reliability of the system and reduce the service life of the system

Method used

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  • Switching power supply as well as ringing elimination circuit and ringing elimination method thereof
  • Switching power supply as well as ringing elimination circuit and ringing elimination method thereof
  • Switching power supply as well as ringing elimination circuit and ringing elimination method thereof

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Embodiment Construction

[0040] Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings. In the various figures, identical elements are indicated with similar reference numerals. For the sake of clarity, various parts in the drawings have not been drawn to scale. Also, some well-known parts may not be shown in the drawings.

[0041] In the following, many specific details of the present invention, such as structures, materials, dimensions, processes and techniques of components, are described for a clearer understanding of the present invention. However, the invention may be practiced without these specific details, as will be understood by those skilled in the art.

[0042] It should be understood that in the following description, a "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical or electromagnetic connections. When an element or circuit is said to be "connected to" another element or an...

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Abstract

The invention discloses a switching power supply, as well as a ringing elimination circuit and ringing elimination method thereof. The ringing elimination circuit comprises a voltage transmission circuit, a control circuit and a ringing detection circuit. The voltage transmission circuit is used for providing a reference voltage to a conductive path of a switch node, and the ringing detection circuit is connected with the switch node to obtain a switch voltage, and obtains a ringing detection signal according to a switch control signal and the switch voltage. The control circuit is used for switching on or switching off the conductive path according to the switch control signal and the ringing detection signal. In the switch-off stage of each switching period of a power switching tube, when the ringing detection signal represents that the switch voltage is smaller than a preset value, the control circuit conducts the conductive path and provides the reference voltage to the switch node, so that high-frequency oscillation at the switch node is inhibited, ringing is reduced, unnecessary noise is reduced, and the efficiency and reliability of the circuit are improved.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more particularly relates to a switching power supply, a ringing elimination circuit and a ringing elimination method thereof. Background technique [0002] A switching power supply generally has two operating modes: a continuous conduction mode (Continuous Conduction Mode, CCM) and a discontinuous conduction mode (Discontinuous Conduction Mode, DCM). The difference between the two is: in the continuous conduction mode, the switch signal will control the power switch to turn on again when the inductor discharge is not completely over; while in the discontinuous conduction mode, the switch signal will control the power switch after the inductor discharge is completed. The switch tube is turned on. [0003] Such as figure 1 A common switching power supply circuit is shown. The switching power supply 100 includes an inductor L1 , a power switch M0 , a freewheeling diode D1 and a cont...

Claims

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Application Information

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IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 陈建春闫守宝于翔
Owner SG MICRO
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