High-frequency transformer and electronic magnetic interference (EMI) suppression circuit including same

A technology of high-frequency transformers and suppression circuits, which is applied in the field of transformers, can solve problems such as unsatisfactory EMI suppression effects, and achieve the effects of solving electromagnetic interference, saving costs, and suppressing high-frequency common-mode interference current impacts

Active Publication Date: 2015-11-11
JIANGSU KEGU ELECTRONICS CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the existing high-frequency tran

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  • High-frequency transformer and electronic magnetic interference (EMI) suppression circuit including same
  • High-frequency transformer and electronic magnetic interference (EMI) suppression circuit including same
  • High-frequency transformer and electronic magnetic interference (EMI) suppression circuit including same

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0030] The function of the high-frequency transformer proposed in the present invention is to solve the electromagnetic interference problem of the constant current source of the main circuit topology of the self-excited oscillation LLC resonant half-bridge, and provide users with a green and safe lighting space and a comfortable lighting environment.

[0031] In order to achieve the above-mentioned purpose, as figure 1 As shown, the present invention proposes a hi...

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Abstract

The invention discloses a high-frequency transformer. The high-frequency transformer comprises a magnetic core and windings, wherein the magnetic core and the windings are arranged on a skeleton; and two shielding layers are arranged on the windings. The invention further discloses an electronic magnetic interference (EMI) suppression circuit including the high-frequency transformer. The EMI suppression circuit comprises a common-mode capacitor, an alternating current (AC) input, a common-mode inductor, a rectifier filter, an LLC converter, a high-frequency transformer and a rectified output, wherein one end of the common-mode capacitor is connected to a zero end of the common-mode inductor; and the other end of the common-mode capacitor is connected to a negative port of the rectified output. The two shielding layers are arranged on the high-frequency transformer, so that the electronic magnetic interference of the high-frequency transformer is suppressed to the minimum. According to the EMI suppression circuit including the high-frequency transformer, the problem of electronic magnetic interference is efficiently solved; the high-frequency common-mode interference current shock is relatively well suppressed; the size and the weight are reduced; and the cost is reduced.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a high-frequency transformer and an EMI suppression circuit composed of the same. Background technique [0002] Most of the LED drive power supply uses switching power supply, but the switching power supply will produce strong electromagnetic interference and harmonic interference. We call this electromagnetic interference EMI (Electronic Magnetic Interference). [0003] EMI signals not only have a wide frequency range (from hundreds of Hz to MHz), but also have a certain amplitude. Through conduction and radiation, they will pollute the electromagnetic environment, cause interference to nearby electronic equipment, and may endanger operators. For example, when we watch TV, if someone next to us uses a household appliance such as a hair dryer or an electric razor, annoying snowflake streaks will appear on the screen. The rice cooker does not cook the rice well, the air conditioner t...

Claims

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Application Information

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IPC IPC(8): H01F27/36H01F27/40H01F27/30H02M1/44
Inventor 李锦红邱荣盛孙立涛
Owner JIANGSU KEGU ELECTRONICS CO LTD
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