CN1254000C - Power transducer dynamic node electric potential balance common mode EMI inhibiting method - Google Patents
Power transducer dynamic node electric potential balance common mode EMI inhibiting method Download PDFInfo
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- CN1254000C CN1254000C CN 02145287 CN02145287A CN1254000C CN 1254000 C CN1254000 C CN 1254000C CN 02145287 CN02145287 CN 02145287 CN 02145287 A CN02145287 A CN 02145287A CN 1254000 C CN1254000 C CN 1254000C
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- power
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- dynamic node
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Abstract
The present invention discloses a method for restraining the dynamic node potential balance common mode EMI of a power converter. A dynamic node pair with the same size du/dt and opposite phases, namely a dynamic node pair with a balanced potential, is formed in the main circuit of the power converter; approximately equal earth distribution capacitance of each node is made by using the power switch devices arranged on the same earthing heat radiator via each node of circuit transformation in dynamic potential node pairs. The present invention has the advantages that the common mode EMI of the power converter can be reduced under the condition of adding no external circuit and device via the structure change of the internal circuit of the power converter, and the earthing common mode current i <cm> flowing through the heat radiator can be reduced greatly. The present invention is simple and practical, and can be used in the topology of the existing power converters, such as a Boost circuit, a Buck circuit, a Buck-Boost circuit, etc.
Description
Technical field
The present invention relates to the common mode EMI inhibition method of power inverter.
Background technology
The source of power inverter conduction common mode EMI (electromagnetic interference) electrical nodes that mainly current potential acutely changes in time in the circuit produces displacement current and flows through earth-return and causes in its distributed capacitance over the ground.To be example as the traditional BOOST circuit of Fig. 1, arrow is depicted as common mode current i
CmThe path of flowing through.Node n2 links to each other with the drain electrode d of MOSFET (diagram Q), and its current potential u sharply changes with the change of the on off operating mode of MOSFET, and promptly the du/dt of this node n2 is very big.The drain electrode d of MOSFET and the heat radiating metal shell of its encapsulation join in inside, and this metal-back is fixed on the external radiator by insulation spacer again, and radiator is ground connection then.Therefore, there is a big distributed capacitance C between the drain electrode d of MOSFET and the ground
J1According to the formula C* (du/dt) of displacement current, as seen the du/dt that MOSFET drain electrode d is big is at its big C of distributed capacitance over the ground
J1On can produce a big displacement current C
J1* the common mode EMI in the middle of (du/dt), and this displacement current is by in the loop, earth connection inflow place of radiator, Here it is circuit, i.e. common mode current i
CmThe source.
Other node n1 in the circuit, n3, though the above earth potential of n4 also suspends, the current potential rate of change is little on the node, and over the ground distributed capacitance also much smaller than C
J1(node n3 exception, because the negative electrode of diode D also links to each other with heat-dissipating casing, and diode D also will be installed on the external heat sink, so C
J2Also quite big), so other node displacement current over the ground can be ignored.
Summary of the invention
The purpose of this invention is to provide a kind of Power transducer dynamic node electric potential balance common mode emi inhibiting method, it can reduce the common mode EMI of power inverter.
Technical scheme of the present invention is as follows: by the inductance in buck (BUCK), boost type (BOOST) or buck-boost formula (BUCK-BOOST) power inverter is split into two, and will move on to the source electrode of MOSFET with the power diode that the drain electrode of MOSFET links to each other, the negative electrode of the drain electrode of power MOSFET tube and power diode current potential over the ground is at the du/dt equal and opposite in direction of MOSFET power tube switch moment generation like this, direction is opposite, and the dynamic node that constitutes potential balance is right; Adopt the insulation spacer of same material to be installed on the same radiator of ground connection power MOSFET tube and power diode, thereby make the right approximately equal of distributed capacitance over the ground of above-mentioned dynamic node.
Advantage of the present invention is the variation by the power inverter internal circuit configuration, just can reduce the common mode EMI of power inverter under the situation that does not increase any external circuit and device, the feasible common mode current i of radiator to ground that flow through
CmReduce greatly.The present invention is simple and practical, can be applied in more existing power inverter topologys, and BOOST circuit for example is in the circuit such as BUCK circuit and BUCK-BOOST.
Description of drawings
Fig. 1 is traditional BOOST circuit diagram;
Fig. 2 is a circuit diagram of the present invention.
Embodiment
The present invention now at first constructs the du/dt equal and opposite in direction with the example that is applied as of traditional BOOST circuit in the power inverter main circuit, phase place is opposite, and promptly the dynamic node of potential balance is right.Inductance in the traditional B OOST circuit (Fig. 1) is drawn from the winding centre tap, be divided into the inductance of two equal-sized L/2.One still is connected between node n1 and the n2, another then reconfiguration between node n3 and n4, as shown in Figure 2.What node n2 and n4 were received is two terminals that the inductance centre tap is drawn to be increased, and is two terminals of inductance when not having centre tap and node n1 and n3 connect.Like this, when the switch mosfet transient state, the du/dt of node n4 is consistent with the du/dt size of node n2, and direction is opposite.Two high du/dt dynamic node n2 and n4 can obtain dynamic potential balance in circuit inside.
Secondly the conversion by circuit is installed in the device for power switching of same ground connection radiator in dynamic each right node utilization of potential nodes, makes approximately equalised each node distributed capacitance over the ground.As Fig. 2, again with sustained diode from Fig. 1 on the traditional DC side branch road move on to down branch road, the negative electrode of diode D links to each other with node n4.Because the drain electrode of MOSFET all is partly to link to each other with the heat radiating metal of its encapsulation with power diode D negative electrode, and in same circuit, the power grade of MOSFET and diode D is similar usually, its package size also is consistent.MOSFET and D are installed on the radiator, adopt the insulation spacer of same material, node n2 and n4 distributed capacitance C over the ground
J1And C
J2The size trend is consistent.Obviously, the current potential of node n2 and n4 changes in balance is at distributed capacitance C
J1And C
J2The middle displacement current i that produces
Cm1And i
Cm2Equal and opposite in direction, direction is opposite, cancels each other, the feasible common mode current i of radiator to ground that flow through
CmReduce greatly, circuit as shown in Figure 2.
An experiment of having used the BOOST circuit of this invention is shown, adopt the common mode EMI after this technology on average to reduce 20dB.
Claims (1)
1. Power transducer dynamic node electric potential balance common mode emi inhibiting method, it is characterized in that: by the inductance in buck, boost type or the buck-boost formula power inverter is split into two, and will move on to the source electrode of MOSFET with the power diode that the drain electrode of MOSFET links to each other, the negative electrode of the drain electrode of power MOSFET tube and power diode current potential over the ground is at the du/dt equal and opposite in direction of MOSFET power tube switch moment generation like this, direction is opposite, and the dynamic node that constitutes potential balance is right; Adopt the insulation spacer of same material to be installed on the same radiator of ground connection power MOSFET tube and power diode, thereby make the right approximately equal of distributed capacitance over the ground of above-mentioned dynamic node.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145287 CN1254000C (en) | 2002-11-12 | 2002-11-12 | Power transducer dynamic node electric potential balance common mode EMI inhibiting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02145287 CN1254000C (en) | 2002-11-12 | 2002-11-12 | Power transducer dynamic node electric potential balance common mode EMI inhibiting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1411131A CN1411131A (en) | 2003-04-16 |
| CN1254000C true CN1254000C (en) | 2006-04-26 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02145287 Expired - Fee Related CN1254000C (en) | 2002-11-12 | 2002-11-12 | Power transducer dynamic node electric potential balance common mode EMI inhibiting method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1254000C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5995572B2 (en) * | 2011-08-31 | 2016-09-21 | キヤノン株式会社 | Line filter, switching power supply equipped with line filter, and image forming apparatus |
| CN103595243B (en) * | 2013-11-23 | 2015-12-30 | 大连尚能科技发展有限公司 | Be applicable to the method suppressing common mode electromagnetic interference in wind-driven generator drive system |
| CN104079162A (en) * | 2014-06-10 | 2014-10-01 | 南京航空航天大学 | Power converter and common-mode EMI noise source restraining method for power converter |
| CN105553319B (en) * | 2015-12-31 | 2018-04-06 | 燕山大学 | A kind of control method of the non-isolated Buck Boost three-phase photovoltaic inverters of single-stage |
| JP6563081B1 (en) * | 2018-06-20 | 2019-08-21 | 三菱電機株式会社 | Power converter |
| CN112104223A (en) * | 2020-09-28 | 2020-12-18 | 哈尔滨工业大学（深圳） | Balanced structure isolating switch power supply with zero common-mode electromagnetic noise |
-
2002
- 2002-11-12 CN CN 02145287 patent/CN1254000C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1411131A (en) | 2003-04-16 |
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Assignee: Inventronics (Hangzhou) Co., Ltd. Assignor: Zhejiang University Contract fulfillment period: 2009.8.1 to 2014.7.31 contract change Contract record no.: 2009330002488 Denomination of invention: Power transducer dynamic node electric potential balance common mode EMI inhibiting method Granted publication date: 20060426 License type: Exclusive license Record date: 20091014 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.8.1 TO 2014.7.31; CHANGE OF CONTRACT Name of requester: INVENTRONICS( HANGZHOU ) CO., LTD. Effective date: 20091014 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060426 Termination date: 20141112 |
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| EXPY | Termination of patent right or utility model |