EMI inhibition circuit, non-isolated switching power supply, DC power supply and household electrical appliance
A switching power supply, non-isolated technology, applied in the electronic field, can solve the problems of large common mode suppression devices, unfavorable circuit board design and layout, and reduced thermal conversion efficiency of the whole machine.
Active Publication Date: 2018-05-25
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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- Abstract
- Description
- Claims
- Application Information
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Problems solved by technology
[0006] First, the common mode suppression device is relatively large and needs to occupy a large space on the circuit board, which is not conducive to the design and layout of the circuit board;
[0007] Second, the cost of common mode suppression devices is relatively high;
[0008] Third, the common mode suppression device generates a lot of heat, which leads to a decrease in the thermal conversion efficiency of the whole machine
Method used
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[0046] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0047] Those skilled in the art can understand that the word "comprising" used in the description of the present invention refers to the presence of the above-mentioned features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features , integers, steps, operations, elements, components, and / or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Additionally, "connected" or "coupled" as used herein may inclu...
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Abstract
The invention provides an EMI inhibition circuit used for a non-isolated switching power supply, the switching power supply, a DC power supply and a household electrical appliance, and belongs to thefield of EMI. The switching power supply converts AC from an AC power supply into DC output. The EMI inhibition circuit comprises a filtering capacitor, a first capacitor and a second capacitor; the first end of the filtering capacitor is connected to the grounding end, and the second end of the filtering capacitor is connected to the output end of the DC-DC conversion unit; the first end of the first capacitor is connected to the first end of the filtering capacitor, and the second end of the first capacitor is connected to a zero line or live wire of the AC power supply; and the first end ofthe second capacitor is connected to the zero line or live wire, and the second end of the second capacitor is connected to the second end of the filtering capacitor. Thus, an effective EMI groundingcontrol scheme can be provided, and an EMI problem of the switching power supply can be eliminated effectively.
Description
technical field [0001] The invention relates to the field of electronic technology, in particular to an EMI suppression circuit for a non-isolated switching power supply, a non-isolated switching power supply, a DC power supply and household appliances. Background technique [0002] Due to the defect of low conversion efficiency of linear power supply, switching power supply with higher conversion efficiency has been favored and popularized by many household appliance manufacturers. [0003] The working principle of the switching power supply is: the switching power supply directly converts the AC current into a DC current at the input end, and under the action of the high-frequency oscillating circuit, uses the switching tube to control the on-off of the current to form a high-frequency pulse current, and then inductance With the help of the device, a stable low-voltage DC power supply is output. Commonly used switching tubes include transistors, thyristors, magnetic switc...
Claims
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Login to View More IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 何勇
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD