Switching power supply and its ringing elimination circuit and ringing elimination method

A technology that eliminates circuits and switching power supplies. It is applied in the direction of electrical components, adjusting electrical variables, and output power conversion devices. It can solve problems that affect system reliability, electromagnetic interference, and reduce system service life, so as to improve circuit efficiency and reliability. performance, reduce ringing, and reduce noise

Active Publication Date: 2021-10-15
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 and its ringing elimination circuit and ringing elimination method
  • Switching power supply and its ringing elimination circuit and ringing elimination method
  • Switching power supply and its ringing elimination circuit and ringing elimination method

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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 and its ringing elimination circuit and ringing elimination method. The ringing elimination circuit includes a voltage transfer circuit, a control circuit and a ringing detection circuit. The voltage transfer circuit is used to provide a reference voltage to the conduction path of the switch node, the ring detection circuit is connected to the switch node to obtain a switch voltage, and obtains a ring detection signal according to the switch control signal and the switch voltage, and the control circuit is used to obtain a ring detection signal according to the switch node. The switch control signal and the ringing detection signal turn on or turn off the conductive path. Wherein, in the turn-off phase of each switching cycle of the power switch tube, when the ringing detection signal indicates that the switch voltage is less than a predetermined value, the control circuit turns on the conductive path and provides the reference voltage to the switch node, thereby suppressing The high-frequency oscillation at the switch node is eliminated, ringing is reduced, unnecessary noise is reduced, and circuit efficiency and reliability 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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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
CPCH02M3/155
Inventor 陈建春闫守宝于翔
Owner SG MICRO
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