Method and device for adjusting conducted emission of switch mode power supply

A technology of switching power supply and conduction interference, which is applied in the direction of adjusting electric variables, output power conversion devices, control/regulation systems, etc., can solve problems such as inability to meet electromagnetic compatibility requirements, and achieve the effect of meeting electromagnetic compatibility requirements

Active Publication Date: 2016-03-02
HUAWEI TECH CO LTD
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  • Claims
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Problems solved by technology

At this time, when the input voltage of the switching power supply is a DC voltage, there is little difference between the average value and the peak value of the conducted interference energy in the conducted interference waveform, and some average values ​​exceed a certain limit value, which cannot meet the electromagnetic compatibility requirements.

Method used

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  • Method and device for adjusting conducted emission of switch mode power supply
  • Method and device for adjusting conducted emission of switch mode power supply
  • Method and device for adjusting conducted emission of switch mode power supply

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Embodiment Construction

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0053] figure 1 It is a structural diagram of a switching power supply in an application scenario of an embodiment of the present invention.

[0054] figure 1 The switching power supply 10 includes a PFC circuit 11 , a bus capacitor 12 , an LLC circuit 13 and a control circuit 14 . The input voltage of the switching power supply is a DC voltage, that is, the input voltage of the PFC circuit is a DC voltage. The LLC circuit in the embodiment of the prese...

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Abstract

The embodiment of the invention provides a method and device for adjusting conducted emission of a switch mode power supply. The switch mode power supply comprises a power factor correction (PFC) circuit, a bus capacitor, a DC-DC conversion circuit and a control circuit. According to the method, a ripple voltage can be superimposed on the voltage of the bus capacitor when the input voltage of the switch mode power supply is DC voltage. According to the embodiment of the invention, the ripper voltage can be superimposed on the voltage of the bus capacitor, and thus, the electromagnetic compatibility requirement of a device in a power grid environment can be met when the switch mode power supply inputs the DC voltage.

Description

technical field [0001] The present invention relates to the field of switching power supplies (SwitchModePowerSupply, SMPS), and more particularly, to methods and devices for regulating conducted disturbances of switching power supplies. Background technique [0002] Switching power supply is a kind of power supply that uses modern power electronic technology to control the time ratio of switching on and off to maintain a stable output voltage. At present, switching power supply is widely used in almost all electronic devices due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry. Switching power supply products are widely used in industrial automation control, military equipment, communication equipment, power equipment, instrumentation, medical equipment, semiconductor refrigeration and heating, liquid crystal display and digital products and other fields. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/44H02M3/158
CPCH02M1/44H02M3/158
Inventor 王德臣张占景李金祁
Owner HUAWEI TECH CO LTD
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