CN104883047A - Common-mode and differential-mode current suppression circuit - Google Patents
Common-mode and differential-mode current suppression circuit Download PDFInfo
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- CN104883047A CN104883047A CN201410836868.5A CN201410836868A CN104883047A CN 104883047 A CN104883047 A CN 104883047A CN 201410836868 A CN201410836868 A CN 201410836868A CN 104883047 A CN104883047 A CN 104883047A
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Abstract
The invention discloses a common-mode and differential-mode current suppression circuit, which comprises a first field-effect transistor and a second field-effect transistor, wherein the first field-effect transistor and the second field-effect transistor which are in complementary symmetry form a push-pull circuit which is a parallel compensation circuit, a common-mode current is induced on a third winding of a common-mode transformer, the common-mode current is converted into a corresponding common-mode voltage through a sampling resistor R so as to be processed by an intelligent control unit, the push-pull compensation circuit composed of the first field-effect transistor and the second field-effect transistor is controlled to generate a compensation current which is equal to a common-mode current source in magnitude and opposite to the common-mode current source in direction, the compensation current is fed back to the circuit through a third capacitor and a fourth capacitor so as to achieve the purpose of suppressing the common-mode current, and a sixth capacitor is used for suppressing a differential-mode current. The common-mode and differential-mode current suppression circuit reduces size of a hardware circuit, and has good flexibility and high filtering capability.
Description
Technical field
The invention belongs to EMC (Electromagnetic Compatibility) field of electromagnetic compatibility, be specifically related to a kind of common mode differential-mode current and suppress circuit.
Technical background
Along with electronics, electrically, communication, the developing rapidly of computer technology, Electro Magnetic Compatibility more and more causes the great attention of people in the significance in industry, scientific research, civilian and military field.Wherein conduction and Radiative EMI may cause producing serious electromagnetic interference problem between other electronic equipment of neighbouring or common source, even may affect health.Therefore the various world and domestic electromagnetic compatibility standard and specification are enforced in succession, make EMI become a problem anxious to be resolved.Wherein, common mode differential mode interference accounts for the main status of EMI.Common mode differential-mode current also can produce radiated interference.
Mainly through passive filter circuit filtering common mode differential mode electromagnetic interference in prior art.Existing common mode differential mode filter circuit, be commonly referred to electromagnetic interface filter, the passive devices such as main dependence electric capacity, inductance carry out filtering, its volume is large, cost is high, and its filtering performance not only depends on filter itself, and depends on noise source and noise loading impedance, electromagnetic interface filter wants to give full play to performance, and impedance must well be mated.For power electronic equipment, the noise source of electromagnetic interface filter is exactly device itself, and noise source impedance changes along with switch topology change.Noise loading is electrical network, and impedance conditions is also ceaselessly changing.Thus, when electromagnetic interface filter is used for actual device, attenuation is difficult to determine, even also can produce negative interaction at some Frequency point, and its filter capacity is limited.And filter is once place in circuit just cannot be revised, very flexible.
Summary of the invention
The present invention is exactly the deficiency in order to overcome above, and propose a kind of common mode differential-mode current and suppress circuit, utilize software control method to reduce hardware circuit volume, flexibility is good, and filter capacity is strong.
In order to solve the problems of the technologies described above, the present invention is by the following technical solutions: a kind of common mode differential-mode current suppresses circuit, comprises common mode transformer L, sampling resistor R, intelligent control unit MCU, first field effect transistor Q1, the second field effect transistor Q2, the first electric capacity Cy1, second electric capacity Cy2,3rd electric capacity C1, the 4th electric capacity C2, the 5th electric capacity C
0, the 6th electric capacity CX, input anode Vin+, input negative terminal Vin-, output plus terminal Vout+, exports negative terminal Vout-and voltage of direct-flow voltage regulation source VC; Described first electric capacity Cy1 mono-termination input anode Vin+ and common mode transformer L Same Name of Ends, other end ground connection; Second electric capacity Cy2 mono-termination input negative terminal Vin-and common mode transformer L Same Name of Ends, other end ground connection; Sampling resistor R connects common mode transformer L mono-winding two ends, and the first field effect transistor Q1 grid connects the second field effect transistor Q2 grid and accesses intelligent control unit MCU, and the first field effect transistor Q1 source electrode connects the second field effect transistor Q2 source electrode and accesses intelligent control unit MCU; 5th electric capacity C
0one termination first field effect transistor Q1 source electrode, other end ground connection; Voltage of direct-flow voltage regulation source VC positive pole connects the first field effect transistor Q1 drain electrode, and voltage of direct-flow voltage regulation source VC negative pole connects the second field effect transistor Q2 drain electrode; 3rd electric capacity C1 mono-termination output plus terminal Vout+, another termination voltage of direct-flow voltage regulation source VC positive pole; 4th electric capacity C2 mono-termination exports negative terminal Vout-, and another termination second field effect transistor Q2 drains; 6th electric capacity Cx mono-termination exports negative terminal Vout-, another termination output plus terminal Vout+.
During circuit working, common mode current is induced by the common mode transformer tertiary winding, corresponding common-mode voltage is transformed into so that intelligent control unit MCU process through sampling resistor R, the compensating circuit of recommending controlling to be made up of the first field effect transistor Q1 and the second field effect transistor Q2 produces the offset current contrary with common mode current source equal and opposite in direction direction, feed back in circuit the object reaching and suppress common mode current again through the 3rd electric capacity C1 and the 4th electric capacity C2, the 6th electric capacity CX is for suppressing differential-mode current.
Wherein, a described common mode transformer L has 3 windings, is respectively the first winding, the second winding and the tertiary winding.Wherein, described common mode transformer L first winding, in the second winding place in circuit, wherein the first winding first end 1A meets input anode Vin+, and the second end 1B meets output plus terminal Vout+; Second winding first end 2A meets input negative terminal Vin-, and the second end 2B connects and exports negative terminal Vout-; Tertiary winding first end 3A connects sampling resistor R one end, and the second end 3B connects the sampling resistor R other end; Sampling resistor R induces common mode current, through being transformed into corresponding common-mode voltage so that intelligent control unit MCU process.The described first end 1A of common mode transformer first winding and the first end 3A of the first end 2A of the second winding and the tertiary winding is Same Name of Ends.
Wherein, the first described field effect transistor Q1 is positive-negative-positive structure, and the second field effect transistor Q2 is NPN structure, and the first field effect transistor Q1 recommends compensating circuit with the second field effect transistor Q2 switch performance consistent composition.The 6th described electric capacity CX is that differential mode suppresses electric capacity.
Compared with prior art, the invention has the beneficial effects as follows:
Utilize software control method to save hardware circuit, reduce circuit volume, be convenient to integrated, and make control convenient, circuit flexibility is strong, is convenient to amendment; The simple cost of circuit structure is low, and circuit suppresses common mode differential-mode current ability stronger.
Accompanying drawing explanation
Fig. 1 is that common mode differential-mode current of the present invention suppresses circuit embodiments schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the present invention is further described.
As Fig. 1, a kind of common mode differential-mode current suppresses circuit, comprises common mode transformer L, sampling resistor R, intelligent control unit MCU, the first field effect transistor Q1, the second field effect transistor Q2, the first electric capacity Cy1, the second electric capacity Cy2, the 3rd electric capacity C1, the 4th electric capacity C2, the 5th electric capacity C
0, the 6th electric capacity CX, input anode Vin+, input negative terminal Vin-, output plus terminal Vout+, exports negative terminal Vout-and voltage of direct-flow voltage regulation source VC; Described first electric capacity Cy1 mono-termination input anode Vin+ and common mode transformer L Same Name of Ends, other end ground connection; Second electric capacity Cy2 mono-termination input negative terminal Vin-and common mode transformer L Same Name of Ends, other end ground connection; Sampling resistor R connects common mode transformer L mono-winding two ends, and the first field effect transistor Q1 grid connects the second field effect transistor Q2 grid and accesses intelligent control unit MCU, and the first field effect transistor Q1 source electrode connects the second field effect transistor Q2 source electrode and accesses intelligent control unit MCU; 5th electric capacity C
0one termination first field effect transistor Q1 source electrode, other end ground connection; Voltage of direct-flow voltage regulation source VC positive pole connects the first field effect transistor Q1 drain electrode, and voltage of direct-flow voltage regulation source VC negative pole connects the second field effect transistor Q2 drain electrode; 3rd electric capacity C1 mono-termination output plus terminal Vout+, another termination voltage of direct-flow voltage regulation source VC positive pole; 4th electric capacity C2 mono-termination exports negative terminal Vout-, and another termination second field effect transistor Q2 drains; 6th electric capacity CX mono-termination exports negative terminal Vout-, another termination output plus terminal Vout+.Common mode current is induced by the common mode transformer tertiary winding, corresponding common-mode voltage is transformed into so that intelligent control unit MCU process through sampling resistor R, the compensating circuit of recommending controlling to be made up of the first field effect transistor Q1 and the second field effect transistor Q2 produces the offset current contrary with common mode current source equal and opposite in direction direction, feed back in circuit the object reaching and suppress common mode current again through the 3rd electric capacity C1 and the 4th electric capacity C2, the 6th electric capacity CX is for suppressing differential-mode current.
In this embodiment, external dc voltage of voltage regulation VC affords redress the energy of circuit Injection Current, and voltage is more than or equal to 8V.Coupling capacitance C1 and C2, output capacitance C
0select high voltagehigh frequency electric capacity.
Because of common mode transformer be on the basis of common mode inductance, add a winding and on winding one in parallel detect resistance R, the high-frequency voltage signal that resistance is formed and common mode current in proportion relation.So need according to the turn ratio of the requirement Design of Transformer of the size of common mode current and high frequency voltage.Reduce the stray capacitance of common mode transformer armature winding as far as possible, prevent high-frequency current from directly flowing through transformer by stray capacitance.In addition, common mode transformer armature winding can bear inverter load current.
Shunt peaking circuit is the push-pull circuit be made up of mutual symmetry Q1 and Q2MOSFET, for making the common mode compensation electric current required for compensating circuit generation, will provide suitable PWM drive singal to push-pull circuit.Want when pipe under upper pipe conducting turns off to provide sufficiently high positive voltage, when pipe is opened under upper pipe turns off, to provide sufficiently high negative voltage.Therefore drive circuit is wanted to provide ± the driving voltage of 10V.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (1)
1. a common mode differential-mode current suppresses circuit, it is characterized in that: comprise common mode transformer (L), sampling resistor (R), intelligent control unit MCU, the first field effect transistor (Q1), second field effect transistor (Q2), first electric capacity (Cy1), the second electric capacity (Cy2), the 3rd electric capacity (C1), 4th electric capacity (C2), the 5th electric capacity (C
0), the 6th electric capacity (CX), input anode (Vin+), input negative terminal (Vin-), output plus terminal (Vout+), exports negative terminal (Vout-) and voltage of direct-flow voltage regulation source (VC); Described first electric capacity (Cy1) termination input anode (Vin+) and common mode transformer (L) Same Name of Ends, other end ground connection; Second electric capacity (Cy2) one termination input negative terminal (Vin-) and common mode transformer (L) Same Name of Ends, other end ground connection; Sampling resistor (R) connects common mode transformer (L) winding two ends, first field effect transistor (Q1) grid connects the second field effect transistor (Q2) grid and accesses intelligent control unit MCU, and the first field effect transistor (Q1) source electrode connects the second field effect transistor (Q2) source electrode and accesses intelligent control unit MCU; 5th electric capacity (C
0) termination first field effect transistor (Q1) source electrode, other end ground connection; Voltage of direct-flow voltage regulation source (VC) positive pole connects the first field effect transistor (Q1) drain electrode, and voltage of direct-flow voltage regulation source (VC) negative pole connects the second field effect transistor (Q2) drain electrode; 3rd electric capacity (C1) one termination output plus terminal (Vout+), another termination voltage of direct-flow voltage regulation source (VC) positive pole; 4th electric capacity (C2) one termination exports negative terminal (Vout-), and another termination second field effect transistor (Q2) drains; 6th electric capacity (CX) one termination exports negative terminal (Vout-), another termination output plus terminal (Vout+); Described common mode transformer (L) has 3 windings, is respectively the first winding, the second winding and the tertiary winding; In described common mode transformer (L) first winding, the second winding place in circuit, wherein the first winding first end (1A) connects input anode (Vin+), and the second end (1B) connects output plus terminal (Vout+); Second winding first end (2A) connects input negative terminal (Vin-), and the second end (2B) connects and exports negative terminal (Vout-); Tertiary winding first end (3A) connects sampling resistor (R) one end, and the second end (3B) connects sampling resistor (R) other end; Sampling resistor (R) induces common mode current, through being transformed into corresponding common-mode voltage so that intelligent control unit MCU process; The first end (3A) of the first end (1A) of the first winding of described common mode transformer and the first end (2A) of the second winding and the tertiary winding is Same Name of Ends; Described the first field effect transistor (Q1) is positive-negative-positive structure, second field effect transistor (Q2) is NPN structure, and the first field effect transistor (Q1) recommends compensating circuit with the second field effect transistor (Q2) switch performance consistent composition; The 6th described electric capacity (CX) is that differential mode suppresses electric capacity.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410836868.5A CN104883047A (en) | 2014-12-29 | 2014-12-29 | Common-mode and differential-mode current suppression circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410836868.5A CN104883047A (en) | 2014-12-29 | 2014-12-29 | Common-mode and differential-mode current suppression circuit |
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| CN104883047A true CN104883047A (en) | 2015-09-02 |
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| CN201410836868.5A Pending CN104883047A (en) | 2014-12-29 | 2014-12-29 | Common-mode and differential-mode current suppression circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021026860A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市汇顶科技股份有限公司 | Amplifier circuit, chip, and electronic apparatus |
| CN113708355A (en) * | 2021-08-16 | 2021-11-26 | 深圳供电局有限公司 | Circuit and device for inhibiting direct current filter capacitor impact |
| CN114466485A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | Intelligent lamp, driving circuit thereof and overcurrent protection method of intelligent lamp |
-
2014
- 2014-12-29 CN CN201410836868.5A patent/CN104883047A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021026860A1 (en) * | 2019-08-15 | 2021-02-18 | 深圳市汇顶科技股份有限公司 | Amplifier circuit, chip, and electronic apparatus |
| US11575357B2 (en) | 2019-08-15 | 2023-02-07 | Shenzhen GOODIX Technology Co., Ltd. | Amplifier circuit, chip and electronic device |
| CN113708355A (en) * | 2021-08-16 | 2021-11-26 | 深圳供电局有限公司 | Circuit and device for inhibiting direct current filter capacitor impact |
| CN113708355B (en) * | 2021-08-16 | 2024-02-06 | 深圳供电局有限公司 | Circuit and device for inhibiting direct current filter capacitor impact |
| CN114466485A (en) * | 2021-12-31 | 2022-05-10 | 珠海雷特科技股份有限公司 | Intelligent lamp, driving circuit thereof and overcurrent protection method of intelligent lamp |
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Application publication date: 20150902 |