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Switching power supply circuit and electronic equipment

A switching power supply circuit and circuit technology, applied in electrical components, regulating electrical variables, instruments, etc., can solve the problems of large influence of circuit EMI.

Active Publication Date: 2021-08-13
NINGBO AUX ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Taking the switching power supply circuit as an example, there is common mode interference between the power supply and the ground of the switching power supply circuit. If these interferences cannot be eliminated, they will have a great impact on the EMI of the circuit.

Method used

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  • Switching power supply circuit and electronic equipment
  • Switching power supply circuit and electronic equipment
  • Switching power supply circuit and electronic equipment

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Embodiment Construction

[0040] In order to make the above purpose, features and advantages of the present application more obvious and understandable, specific embodiments of the present application will be described in detail below in conjunction with the accompanying drawings.

[0041] Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. The components of the embodiments of the invention generally described and illustrated in the figures herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the pres...

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Abstract

The invention provides a switching power supply circuit and electronic equipment. The switching power supply circuit comprises a rectifying circuit, an energy storage circuit, a switching tube and a transformer; the rectifying circuit, the energy storage circuit, the transformer and the switching tube are arranged on the substrate, and the substrate is provided with the ground; and the cathode output end of the rectifying circuit and a connecting line form a power ground of the switching power supply circuit, and the power ground is electrically connected with the ground through a wire. According to the scheme provided by the invention, the grounding loop is arranged between the power ground of the switching power supply circuit and the ground, so that common-mode noise conducted to the ground through the ground distributed capacitance of the switching tube and common-mode noise conducted to the ground through the ground distributed capacitance of the secondary side of the transformer can flow back to the switching tube through the grounding loop, the influence of noise on a post-stage load or a power supply is avoided, and the interference of the switching power supply circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of switching power supplies, in particular to a switching power supply circuit and electronic equipment. Background technique [0002] With the rapid development of frequency conversion technology, the equipment used is also pursuing faster logic circuits, and at the same time brings many electromagnetic compatibility problems. For air conditioners, greater efforts must be made to ensure the electromagnetic interference (Electro Magnetic Interference, EMI) requirements. In order to reduce EMI interference, in addition to starting from the board-level device layout, it is also necessary to dig out from the PCB grounding wiring, and this requirement will become increasingly important in the future development of electromagnetic compatibility. [0003] Taking the switching power supply circuit as an example, there is common-mode interference between the power supply and the ground of the switching power supply...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/219H02M1/44H02M1/12
CPCH02M3/33523H02M3/33553H02M7/219H02M1/44H02M1/12Y02B70/10
Inventor 郭函奇
Owner NINGBO AUX ELECTRIC
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