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EMI filter and power supply EMI filter access circuit

A filter, power supply technology, applied in the field of circuit filtering, can solve problems such as no solutions

Inactive Publication Date: 2017-12-15
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] For the above problems, no effective solution has been proposed

Method used

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  • EMI filter and power supply EMI filter access circuit
  • EMI filter and power supply EMI filter access circuit
  • EMI filter and power supply EMI filter access circuit

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with the embodiments and accompanying drawings. Here, the exemplary embodiments and descriptions of the present invention are used to explain the present invention, but not to limit the present invention.

[0020] Considering that the parameters of each component of the conventional air-conditioning power supply EMI filter are fixed, due to the change of source impedance and load impedance, better filtering effect is often not obtained. For this reason, a kind of EMI filter is provided in the embodiment of the present invention, such as figure 1 As shown, can include:

[0021] Adjustable common-mode inductor L1; differential-mode working capacitor CX, connected in parallel with the input end of adjustable common-mode inductor L1; common-mode working capacitor CY and adjustable differential-mode i...

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Abstract

The invention provides an EMI filter and a power supply EMI filter access circuit. The EMI filter comprises an adjustable common-mode inductor, a first differential-mode operating capacitor, a second differential-mode operating capacitor, an adjustable differential-mode inductor, a first common-mode operating capacitor and a second common-mode operating capacitor, wherein the first differential-mode operating capacitor is connected with an input end of the adjustable common-mode inductor in parallel; the second differential-mode operating capacitor is connected with an output end of the adjustable common-mode inductor in parallel; an input end of the adjustable differential-mode inductor is connected with the output end of the adjustable common-mode inductor in parallel; and the first common-mode operating capacitor and the second common-mode operating capacitor are connected in parallel with the input end of the adjustable differential-mode inductor, and a parallel structure is formed between the first common-mode operating capacitor and the second common-mode operating capacitor. According to the embodiment of the invention, the EMI filter can provide high insertion loss in a conducted interference frequency range, so as to attenuate EMI signals to the maximum, thus the electromagnetic property of equipment can meet the standard, and the filtering effect is effectively improved.

Description

technical field [0001] The invention relates to the technical field of circuit filtering, in particular to an EMI filter and a power supply EMI filter access circuit. Background technique [0002] With the wide application of electronic products and conversion devices related to power electronic devices, Electromagnetic Interference (EMI for short) is becoming more and more serious and has become a public hazard. The conduction interference generated by the air conditioner can be reduced to the range required by the electromagnetic compatibility standard through the EMI power filter. The insertion loss of the EMI filter is directly related to the source impedance and load impedance. Therefore, even if the design value of the insertion loss of the EMI filter can meet the standard, if the EMI filter is not used properly, it may be due to changes in the source impedance and load impedance. And can not get the best filtering effect. [0003] For the above problems, no effectiv...

Claims

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Application Information

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IPC IPC(8): H02M1/44
CPCH02M1/44
Inventor 戴彪宋爱程海松
Owner GREE ELECTRIC APPLIANCES INC
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