CN103442538A - Passive element integration method in PFC circuit - Google Patents

Abstract

The invention discloses an integration method of passive components in a PFC circuit. The integration method adopts a flexible PCB to integrate Boost inductors, EMI filter inductors and EMI filter capacitors in a PFC circuit into an EIE-type magnetic core structure, effectively Realize the control of the volume of the circuit, can move, bend, twist without damaging the characteristics of the wire, can comply with different shapes and special package sizes, and can withstand millions of dynamic bendings at the same time, avoiding the separation of components in the PFC circuit The resulting waste of space reduces the volume of the PFC circuit, the structure is simple, the practicability is strong, and the utility model has strong promotion and application value.

Description

An Integration Method of Passive Components in PFC Circuit

technical field

The invention belongs to the technical field of PFC circuits, and in particular relates to an integration method of passive components in a PFC circuit.

Background technique

In the existing PFC circuit, an inductor is usually added between the rectifier bridge stack and the filter capacitor (appropriately select the inductance), and the characteristic that the current on the inductor cannot be mutated is used to smooth the fluctuation of the strong pulse of capacitor charging and improve the current waveform of the power supply line. Distortion, and use the characteristics of the voltage on the inductor to lead the current to also compensate the characteristics of the filter capacitor current leading the voltage, so that the power factor, electromagnetic compatibility and electromagnetic interference can be improved.

At the same time, because the existing PFC circuit is discretely connected through a common circuit board, the Boost inductor, EMI filter inductor and EMI filter capacitor in the PFC circuit occupy a large volume, which cannot meet the needs of some special occasions.

Contents of the invention

The invention provides an integration method of passive components in a PFC circuit, aiming to solve the problem that the volume occupied by the Boost inductor, EMI filter inductor and EMI filter capacitor in the PFC circuit is relatively large due to the discrete connection of the existing PFC circuit through a common circuit board. Big, can not meet the needs of some special occasions.

The purpose of the present invention is to provide an integration method of passive components in a PFC circuit. The integration method adopts a flexible PCB to integrate Boost inductors, EMI filter inductors and EMI filter capacitors in a PFC circuit into an E-I-E magnetic core structure.

The integration method of passive components in the PFC circuit provided by the present invention adopts a flexible PCB to integrate the Boost inductance, EMI filter inductance and EMI filter capacitor in the PFC circuit into an E-I-E magnetic core structure, effectively realizing the The control of the circuit volume, the characteristics of being able to move, bend, and twist without damaging the wire, can comply with different shapes and special package sizes, and can withstand millions of dynamic bendings at the same time, avoiding the damage caused by the separation of components in the PFC circuit The space is wasted, the volume of the PFC circuit is reduced, the structure is simple, the practicability is strong, and the utility model has strong promotion and application value.

Description of drawings

1 is a three-dimensional diagram of the integrated structure of passive components in a PFC circuit provided by an embodiment of the present invention;

Fig. 2 is a schematic structural diagram of the flexible PCB used in the windings W ₁ to W ₆ provided by the embodiment of the present invention;

Fig. 3 is a schematic structural diagram of the flexible PCB used in the windings W ₇ to W ₈ provided by the embodiment of the present invention;

Fig. 4 is a two-dimensional diagram of an integrated structure of passive components provided by an embodiment of the present invention;

FIG. 5 is an equivalent circuit diagram of an integrated structure provided by an embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the invention.

FIG. 1 shows a structure in which a Boost inductor and an EMI filter are integrated according to an embodiment of the present invention. For ease of illustration, only the parts relevant to the present invention are shown.

The purpose of the present invention is to provide an integration method of passive components in a PFC circuit. The integration method adopts a flexible PCB to integrate Boost inductors, EMI filter inductors and EMI filter capacitors in a PFC circuit into an E-I-E magnetic core structure.

The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1-5, the windings W ₁ to W ₈ are all composed of flexible PCBs, and the flexible PCB structure used in the windings W ₁ to W ₆ includes: insulating tape 1, first copper foil 2, dielectric film 3 and the second Composed of two copper foils 4; the flexible PCB structure used for windings W ₇ ~ W ₈ includes: insulating tape 1 and a third copper foil 4; windings W ₁ ~ W ₄ are wound on the side columns of the E-shaped magnetic core, and winding W ₅ ～W ₆ is wound on the center column of the E-shaped magnetic core, and windings W ₇ ～W ₈ are wound on the I-shaped magnetic core, wherein the input end of the winding W ₁ is connected to the mains, and then W ₂ ～W ₄ are successively In series with W ₁ , two outputs of W ₄ , one is connected to W ₅ , the other is connected to W ₆ , one output of W ₅ and W ₆ is connected to the ground or the chassis, and the other output of W ₅ and W ₆ Connect to the AC end of the rectifier bridge stack. W ₇ and W ₈ are connected in series between the rectifier bridge stack and the switching tube. Windings W ₁ to W ₄ are used to form common-mode inductors and differential-mode capacitors, and windings W ₁ to W ₄ are used to form differential-mode inductors and common-mode capacitors , the windings W ₁ -W ₄ are used to form a Boost inductor.

The present invention integrates the inductance and capacitance in the same space by using a flexible PCB, which can meet the requirements of complicated circuits, processing many signals, or special electrical or mechanical performance requirements. The flexible circuit is a better design choice, and the flexible circuit can effectively realize The control of the volume of the circuit, the characteristics of being able to move, bend, and twist without damaging the wire, can comply with different shapes and special package sizes, and because it can withstand millions of dynamic bends, flexible circuits are well suited for continuous In the interconnection system of exercise or regular exercise.

The invention integrates the inductor and the capacitor in the same space by using a flexible PCB, and integrates the Boost inductor, the EMI filter inductor and the EMI filter capacitor in the PFC circuit into an E-I-E magnetic core structure. The invention avoids the waste of space caused by the separation of components of the PFC circuit, and reduces the volume of the PFC circuit, which can be reduced by 20% under optimal conditions.

The embodiment of the present invention provides an integration method for passive components in a PFC circuit. The integration method uses a flexible PCB to integrate the Boost inductor, EMI filter inductor, and EMI filter capacitor in the PFC circuit into an E-I-E magnetic core structure, effectively Realize the control of the volume of the circuit, can move, bend, twist without damaging the characteristics of the wire, can comply with different shapes and special package sizes, and can withstand millions of dynamic bendings at the same time, avoiding the separation of components in the PFC circuit The resulting waste of space reduces the volume of the PFC circuit, the structure is simple, the practicability is strong, and the utility model has strong promotion and application value.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (4)

1. the integrated approach of passive component in a pfc circuit, is characterized in that, this integrated approach adopts flexible PCB that the Boost inductance in pfc circuit, EMI filter inductance and EMI filter capacitor all are integrated in an E-I-E type core structure.

2. the integrated approach of passive component in pfc circuit as claimed in claim 1, is characterized in that winding W ₁～W ₄be wound on respectively the side column of E type magnetic core, winding W ₅～W ₆be wound on respectively the center pillar of E type magnetic core, winding W ₇～W ₈be wound on respectively on I type magnetic core.

3. the integrated approach of passive component in pfc circuit as claimed in claim 1, is characterized in that winding W ₁the end 01 that enters with 02, with civil power, be connected, winding W ₁～W ₄go out end and enter the numbering of end by 03-05-07 and 02-04-08 and be connected in proper order, winding W ₄go out end 10 and W ₅with being connected, go out end 09 and W ₆with being connected, winding W ₅and W ₆one go out end 13 and jointly receive the earth, casing, both ends 11 and 12 that goes out are received rectifier bridge stack and are exchanged end.Winding W ₅and W ₆after series connection, be connected between rectifier bridge stack output high-pressure side 14 and switch pipe end 16.

4. the integrated approach of passive component in pfc circuit as claimed in claim 1, is characterized in that winding W ₁～W ₄for integrated common mode inductance and differential mode capacitor, winding W ₅～W ₆for integrated differential mode inductance and common mode capacitance, winding W ₇～W ₈for integrated Boost inductance.

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