Switch power supply capable of filtering industrial frequency noise in floating system

A power frequency noise and switching power supply technology, which is applied in the direction of transformer/inductor noise damping, irreversible AC power input conversion to DC power output, etc., can solve the problem that the power frequency noise of the floating system cannot be filtered out, and achieve the elimination of bad Affecting and improving the effect of call quality
CN1881769AInactive Publication Date: 2006-12-20HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2006-12-20
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a switch power supply which can filter the industrial frequency noise of floating system, wherein based on traditional switch power supply, the invention eliminate the Y capacitor, to realize pure coil induction couple between the first coil and the secondary coil of transformer, to eliminate the transmission path of industrial frequency noise at the alternative current end to the secondary end; each rectify diode of rectify bridge is parallel connected to one capacitor, to reduce the aberration of alternative signal generated at the start and end of diode. With said invention, the industrial frequency noise of floating system can be filtered, to confirm the electromagnetic test of switch power meets the EMC standard.
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Description

technical field

[0001] The invention relates to a switching power supply in electronic products, and more specifically relates to a switching power supply capable of filtering power frequency noise in a floating system. Background technique

[0002] At present, there are two types of power supply devices that can convert AC to DC, namely linear power supply and switching power supply. Both types of power supplies introduce common-mode power frequency noise in floating systems. Among them, the capacitance between the transformer windings of the linear power supply is small, and the isolation is good, so the noise can be greatly reduced. Compared with the switching power supply, its noise is small. On the other hand, switching power supplies are widely used in electronic systems because of their light and handy features, wide input voltage range, and high efficiency. For switching power supplies, due to their smaller transformers and more complex designs, it is more difficul...

Claims

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