CN201966813U

CN201966813U - Switching power supply

Info

Publication number: CN201966813U
Application number: CN2011201103628U
Authority: CN
Inventors: 张永学
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-04-11
Filing date: 2011-04-11
Publication date: 2011-09-07
Anticipated expiration: 2021-04-11

Abstract

The utility model provides a switching power supply. The switching power supply comprises an input filter circuit used for filtering high-frequency clutters and in-phase interference signals which are input into commercial power, a secondary filter circuit used for secondarily filtering the high-frequency clutters, a PFC (power factor correction) circuit used for correcting power factors, a bridge rectifier circuit used for converting high-voltage alternating current (AC) to high-voltage direct current (DC), a switching circuit used for converting the high-voltage DC to high-frequency pulse DC, a high-frequency switching transformer used for reducing the voltage of the high-frequency pulse DC, and a triple rectifier and filter circuit used for conducting rectification and filtering once more, which are used for being connected in sequence. According to the utility model, through filtering for multiple times and adopting the PFC circuit to correct the power factors, the utilization rate of the commercial power by the power supply can be increased when the AC is converted to the DC, and the electric energy loss is reduced; meanwhile, by using the PFC circuit, the interference of the power supply in the commercial power and other electrical appliances can be reduced.

Description

A kind of Switching Power Supply

(1) technical field

The utility model relates to a kind of Switching Power Supply.

(2) background technology

The Switching Power Supply product is widely used in industrial automation control, military industry equipment, research equipment, LED illumination, industrial control equipment, communication apparatus, power equipment, instrument and meter, Medical Devices, semiconductor refrigerating and the field such as heats, existing general Switching Power Supply is lower to the utilance of civil power, conversion efficiency is not high when converting electric main to direct current, and electric energy loss is bigger.

(3) summary of the invention

In order to overcome the deficiency of existing Switching Power Supply, the utility model provides the Switching Power Supply that a kind of utilance to civil power is higher, electric energy loss is less.

The technical scheme in the invention for solving the technical problem is: a kind of Switching Power Supply, comprise the high frequency clutter that is used for filtering input civil power that is used for connecting successively and the input filter circuit of in-phase interference signal, the secondary filtering circuit that is used for secondary filtering high frequency clutter, be used for pfc circuit (circuit of power factor correction) that power factor is proofreaied and correct, be used for High Level AC Voltage is converted to the bridge heap rectification circuit of high voltage direct current, be used for high voltage direct current is converted into the switching circuit of high-frequency Rectified alternating current, be used for the high-frequency Rectified alternating current is carried out the high frequency switch transformer of step-down, be used for carrying out once more three current rectifying and wave filtering circuits of rectification and filtering, thereby export pure low-voltage DC.

The beneficial effects of the utility model are: through repeatedly filtering and employing pfc circuit power factor is proofreaied and correct, can when being converted to direct current, improve by alternating current the utilance of power supply to civil power, reduce electric energy loss, use PFC can reduce the interference of power supply simultaneously civil power and other electrical equipment.

(4) description of drawings

Fig. 1 is a schematic diagram of the present utility model.

(5) embodiment

Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.

With reference to Fig. 1, a kind of Switching Power Supply, comprise the high frequency clutter that is used for filtering input civil power that is used for connecting successively and the input filter circuit 1 of in-phase interference signal, the secondary filtering circuit 2 that is used for secondary filtering high frequency clutter, be used for pfc circuit 3 (circuit of power factor correction) that power factor is proofreaied and correct, be used for High Level AC Voltage is converted to the bridge heap rectification circuit 4 of high voltage direct current, be used for high voltage direct current is converted into the switching circuit 5 (generally adopting two switching tubes) of high-frequency Rectified alternating current, be used for the high-frequency Rectified alternating current is carried out the high frequency switch transformer 6 of step-down, be used for carrying out once more three current rectifying and wave filtering circuits 7 of rectification and filtering, thereby export pure low-voltage DC.

The utility model is proofreaied and correct power factor through repeatedly filtering and employing pfc circuit, can when being converted to direct current, improve by alternating current the utilance of power supply to civil power, reduce electric energy loss, use PFC can reduce the interference of power supply simultaneously civil power and other electrical equipment.

Claims

1. Switching Power Supply is characterized in that: comprise the high frequency clutter that is used for filtering input civil power that is used for connecting successively and the input filter circuit of in-phase interference signal, the secondary filtering circuit that is used for secondary filtering high frequency clutter, be used for pfc circuit that power factor is proofreaied and correct, be used for High Level AC Voltage is converted to the bridge heap rectification circuit of high voltage direct current, be used for high voltage direct current is converted into the switching circuit of high-frequency Rectified alternating current, be used for the high-frequency Rectified alternating current is carried out the high frequency switch transformer of step-down, be used for carrying out once more three current rectifying and wave filtering circuits of rectification and filtering.