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Switch voltage-stabilizing circuit and method

A switching voltage regulator, circuit technology, applied in electrical components, regulating electrical variables, instruments, etc., can solve the problem of unsuitable switching frequency, etc., to achieve the effect of reducing electromagnetic interference

Active Publication Date: 2010-05-19
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods for reducing electromagnetic interference have a fixed spectrum range, so they are not suitable for the situation where the switching frequency changes with the load.

Method used

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  • Switch voltage-stabilizing circuit and method
  • Switch voltage-stabilizing circuit and method

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Embodiment Construction

[0028] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting the present invention. The following all take the AC / DC (alternating current / direct current conversion) circuit comprising the flyback converter as an example to illustrate the present invention, but those skilled in the art know that the present invention can also be used in any DC / DC (direct current / direct current conversion) topology , Such as BUCK (buck) circuit, BOOST (boost) circuit, BUCK-BOOST (boost-buck) circuit, FLYBACK (flyback) circuit and FORWARD (forward) circuit, etc.

[0029] Such as figure 1 Shown is a switching regulator circuit 100 according to an embodiment of the present invention. In this embodiment, the switching regulator circuit 100 includes a rectifier bridge 101, an input capacitor C IN , transformer T, main switch M, diode D 1 , output capacitance C OUT , a ...

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PUM

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Abstract

The invention discloses a switch voltage-stabilizing circuit with frequency spectrum shaping function and a method. On the basis of a switch voltage-stabilizer and a method, the frequency spectrum shaping range can be adjusted according to the change of switch frequency, when the switch frequency becomes high, the frequency spectrum shaping range becomes wider; and when the witch frequency becomes low, the frequency spectrum shaping range is reduced. The Switch voltage-stabilizing circuit and the method can effectively reduce the electromagnetic interference.

Description

technical field [0001] The invention relates to a switching voltage stabilizing circuit, in particular to a switching voltage stabilizing circuit and a method with spectrum shaping function. Background technique [0002] Many electronic devices today require DC voltage to be powered, and this DC supply voltage usually comes from an adapter. The adapter obtains AC voltage from the wall socket (grid), converts the AC voltage into an uncontrolled DC voltage through a rectifier bridge, and converts the uncontrolled DC voltage into the required DC power supply voltage through a switching power supply. [0003] Switching power supplies usually use transformers or inductors as energy storage elements. For example, a transformer is used as an energy storage element in a flyback converter. A switch is coupled to the primary side of the transformer. The control circuit controls the switch to be turned on and off, so that energy is alternately stored in the transformer or transferred ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M1/44
CPCH02M1/44H02M3/33507H02M3/33523
Inventor 李恩张军明任远程
Owner CHENGDU MONOLITHIC POWER SYST
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