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DC-DC switching power supply and inductor squealing elimination method thereof

A switching power supply, inductive whistling technology, applied in electrical components, adjusting electrical variables, instruments and other directions to achieve the effect of eliminating whistling

Inactive Publication Date: 2018-04-20
台州市吉吉知识产权运营有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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  • DC-DC switching power supply and inductor squealing elimination method thereof
  • DC-DC switching power supply and inductor squealing elimination method thereof
  • DC-DC switching power supply and inductor squealing elimination method thereof

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Embodiment Construction

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation manners of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other accompanying drawings based on these drawings and obtain other implementations.

[0034] In order to make the drawing concise, each drawing only schematically shows the parts related to the present invention, and they do not represent the actual structure of the product. In addition, to make the drawings concise and easy to understand, in some drawings, only one of the components having the same structure or function is schematically shown, or only one of them is marked. Herein, "a" not only means "only one", but also means "more than one".

[0035] In one emb...

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Abstract

The invention discloses a DC-DC switching power supply and an inductor squealing elimination method thereof. The switching power supply comprises a switching power supply control circuit used for generating a switching signal SW, a switching power supply output filtering circuit used for converting the switching signal SW generated by the switching power supply control circuit into a stable directcurrent voltage to be output, a voltage reduction circuit connected to the output end of the switching power supply control circuit and used for lowering the voltage of the switching signal when theswitching signal SW is high and providing a discharging access for a burr filtering circuit when the switching signal SW is low, and the burr filtering circuit connected between the voltage reductioncircuit and the ground in series and used for enabling the switching signal which is higher than a set voltage to be connected to the ground in a burr short-circuit processing manner when the switching signal SW is high, and discharging charges through the voltage reduction circuit when the switching signal SW is low. By virtue of the switching power supply, the current within the specific frequency range of the DC-DC switching power supply can be filtered out, and inductor squealing can be eliminated effectively.

Description

technical field [0001] The invention relates to the technical field of DC-DC switches, in particular to a DC-DC switching power supply and a method for eliminating inductive noise. Background technique [0002] Inductive howling refers to the phenomenon that the inductance emits a high-frequency and small buzzing sound in the DC-DC switching power supply. Since many electronic products use DC-DC switching power supplies, this phenomenon occurs in many electronic products. The electrical appliances that were originally working silently made a slight noise, which seriously affected the user's silent environment. [0003] The principle of switching power supply in the prior art is as figure 1 As shown, the power supply chip U1 in the figure has two gate pins (gate control pins), which are respectively connected to two NMOS transistors Q1 and Q2. The gate pin outputs a PWM waveform, and the PWM voltage wave is used to control Q1 and Q2. on and off. L1 is the energy storage in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/155H02M1/14
CPCH02M1/14H02M3/155H02M1/0038
Inventor 何山
Owner 台州市吉吉知识产权运营有限公司
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