CN203339949U - Driving power supply forestage EMI filtering protection circuit - Google Patents
Driving power supply forestage EMI filtering protection circuit Download PDFInfo
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- CN203339949U CN203339949U CN2013204247004U CN201320424700U CN203339949U CN 203339949 U CN203339949 U CN 203339949U CN 2013204247004 U CN2013204247004 U CN 2013204247004U CN 201320424700 U CN201320424700 U CN 201320424700U CN 203339949 U CN203339949 U CN 203339949U
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- common mode
- piezo
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- differential mode
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Abstract
The utility model discloses a driving power supply forestage EMI filtering protection circuit which comprises a fuse, a temperature sensitive resistor, a surge protection circuit, a differential mode interference suppression circuit, and a common mode interference suppression circuit. According to the driving power supply forestage EMI filtering protection circuit, multiple levels of filtering structures are employed to carry out effective filtering of an electromagnetic interference signal which enters from a power grid, three pressure sensitive resistors with different discharge voltage values are employed to carry out discharge protection on surge voltage, the fuse and the temperature sensitive resistor close to an entrance carry out breaking protection when overcurrent occurs and play a soft starting role for the whole driving power supply. The driving power supply forestage EMI filtering protection circuit has the advantages of simple circuit, small size, low cost, good reliability, and high insertion loss.
Description
Technical field
The present invention relates to EMI filtering and anti-surge circuit.
Background technology
It is the Switching Power Supply type that driving power adopted more, and volume is little, and efficiency is high, but the high-frequency switch motion of Switching Power Supply brings serious electromagnetic interference problem, prevents for the reliable and stable need of work of driving power the electromagnetic interference come from the outside simultaneously.The EMI filter protective circuit not only can effectively stop the electromagnetic interference influence driving power internal circuit come from the outside, and can stop the electromagnetic interference of driving power self to enter electrical network to pollute.
Existing driving power EMI filter protective circuit adopts too simple one-level or two stage filter structure mostly; the insertion loss value is large not; filter effect to electromagnetic interference is good not; thereby cause the driving power inefficacy caused due to electromagnetic interference problem even to cause the Frequent Accidents that other system lost efficacy; electromagnetic interference is divided into conduction type and radial pattern; and topmost interference is conduction type, an electromagnetic interface filter with good insertion loss characteristic can solve most problems.In addition; the prime surge protection of general driving power only considers that connecting respectively a piezo-resistance on live wire and zero line is connected to the earth; and the present invention not only considers the surge voltage protection between phase line and the earth; and consider and the protection of the surge voltage between phase line and phase line make fail safe further improve.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of filter protective circuit of reliable and stable, high insertion loss is provided.
A kind of driving power prime EMI filter protective circuit, comprise the thermo-sensitive resistor for driving power soft start and overcurrent protection, it is characterized in that: an end of the first piezo-resistance is linked into the live wire end of AC network input by fuse, the other end of the first piezo-resistance is linked into the zero line side of AC network input by thermo-sensitive resistor, the common port of the first piezo-resistance and fuse is connected to the earth by the second piezo-resistance, the common port of the first piezo-resistance and thermo-sensitive resistor is connected to the earth by the 3rd piezo-resistance, the first differential mode capacitor is in parallel with the first piezo-resistance, the first common mode capacitance is in parallel with the second piezo-resistance, the second common mode capacitance is in parallel with the 3rd piezo-resistance, the input of the common mode choke be comprised of the first common mode inductance and the second common mode inductance is parallel to the two ends of the first differential mode capacitor, the second differential mode capacitor is parallel to the output of common mode choke, one end of the second differential mode capacitor is connected to the earth by the 3rd common mode capacitance, the other end of the second differential mode capacitor is connected to the earth by the 4th common mode capacitance, one end of the 3rd differential mode capacitor is connected to the ungrounded end of the 3rd common mode capacitance by the first differential mode inductance, the other end of the 3rd differential mode capacitor is connected to the ungrounded end of the 4th common mode capacitance by the second differential mode inductance, the 5th common mode capacitance and the 6th common mode capacitance are all feedthrough capacitors, its earth terminal all is connected to the earth, one of them punching end of the 5th common mode capacitance is connected to the common port of the first differential mode inductance and the 3rd differential mode capacitor, the first output that another punching end is this circuit, one of them punching end of the 6th common mode capacitance is connected to the common port of the second differential mode inductance and the 3rd differential mode capacitor, the second output that another punching end is this circuit.
Circuit structure of the present invention is simple, can under lower cost, realize higher insertion loss and reliable defencive function.Place the thermo-sensitive resistor RT1 of a fuse F1 and a negative temperature coefficient near the ac grid voltage input, the circuital current caused when subsequent conditioning circuit short circuit or other reasons increases suddenly, fuse F1 fuses to be protected open circuit and being connected of electrical network immediately, and the effect of RT1 is the soft start effect of circuit on the one hand, it is larger than low resistance that circuit is connected moment RT1 temperature, starting current just starts less, the electric current of temperature rising subsequently increases to the normal operation value, this has just realized soft start, soft start-up process can reduce the current stress of components and parts greatly, play the effect of protection components and parts, RT1 effect on the other hand is to respond resistance value step-down immediately when certain reason causes excess Temperature, thereby loop current is increased rapidly and fuse is disconnected, also play certain protective effect, piezo-resistance R1 provides the overvoltage protection between two phase lines, and piezo-resistance R2 and R3 provide respectively the overvoltage protection between live wire and zero line and the earth, capacitor C x1, Cx2, Cx3 is the electric capacity for filtering differential mode interference signal, inoperative to common mode interference signal, capacitor C y1, Cy2 is for the filtering common mode interference signal, but both are equivalent to being connected between two phase lines of series connection simultaneously, be equivalent to the differential mode capacitor of Cy1//Cy2 size, equally, capacitor C y3 and Cy4, Cy5 and Cy6 also are equivalent to the differential mode capacitor of Cy3//Cy4 and Cy5//Cy6 size respectively as the common mode capacitance group time, all differential mode capacitors in the middle of the present invention (x electric capacity) adopt equal capacitance according to the actual effect of insertion loss, all common mode capacitance (y electric capacity) are comprehensively chosen the capability value of equal size according to the leakage current of the actual effect of insertion loss and international ampere restrictions system, two common mode inductance Lc1, the identical common composition common mode choke of the Lc2 coiling opposite direction number of turn, the opposite direction that common mode interference signal flows through in two windings, thereby the magnetic flux produced is cancelled out each other and has been suppressed common mode disturbances, Ld1 and Ld2 are differential mode inductances, the differential mode interference signal is limited through two differential mode inductances, and two differential mode inductances also have certain inhibitory action to common mode interference signal.The present invention has that volume is little, with low cost, reliable and stable, the insertion loss advantages of higher.
The accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention.
Fig. 2 is the common mode insertion loss figure of embodiment 1.
Fig. 3 is the differential mode insertion loss figure of embodiment 1.
Embodiment
As shown in Figure 1, a kind of driving power prime EMI filter protective circuit, comprise the thermo-sensitive resistor RT1 for driving power soft start and overcurrent protection, the end of the first piezo-resistance R1 is linked into the live wire end of AC network input by fuse F1, the other end of the first piezo-resistance R1 is linked into the zero line side of AC network input by thermo-sensitive resistor RT1, the common port of the first piezo-resistance R1 and fuse F1 is connected to the earth by the second piezo-resistance R2, the common port of the first piezo-resistance R1 and thermo-sensitive resistor RT1 is connected to the earth by the 3rd piezo-resistance R3, the first differential mode capacitor Cx1 is in parallel with the first piezo-resistance R1, the first common mode capacitance Cy1 is in parallel with the second piezo-resistance R2, the second common mode capacitance Cy2 is in parallel with the 3rd piezo-resistance R3, the input of the common mode choke that Lc1 and Lc2 form is parallel to the two ends of the first differential mode capacitor Cx1, the second differential mode capacitor Cx2 is parallel to the output of common mode choke, the end of the second differential mode capacitor Cx2 is connected to the earth by the 3rd common mode capacitance Cy3, the other end of the second differential mode capacitor Cx2 is connected to the earth by the 4th common mode capacitance Cy4, the end of the 3rd differential mode capacitor Cx3 is connected to the ungrounded end of the 3rd common mode capacitance Cy3 by the first differential mode inductance Ld1, the other end of the 3rd differential mode capacitor Cx3 is connected to the ungrounded end of the 4th common mode capacitance Cy4 by the second differential mode inductance Ld2, the 5th common mode capacitance Cy5(feedthrough capacitor) and the 6th common mode capacitance Cy6(feedthrough capacitor) earth terminal all be connected to the earth, one of them punching end of the 5th common mode capacitance Cy5 is connected to the common port of the first differential mode inductance Ld1 and the 3rd differential mode capacitor Cx3, another punching end is as an end of this filter protective circuit output, one of them punching end of the 6th common mode capacitance Cy6 is connected to the common port of the second differential mode inductance Ld2 and the 3rd differential mode capacitor Cx3, another punching end is as the other end of this filter protective circuit output, Cx1, Cx2, Cx3, Cy1, Cy2, Cy3, the electric capacity such as Cy4 are polarity free capacitor.The present invention is directed to the line voltage value of the current 220V of China, the discharge voltage value of piezo-resistance R1 is 350V, the discharge voltage value of piezo-resistance R2, R3 is 700V, the capacitance of differential mode capacitor Cx1, Cx2, Cx3 is all selected 0.22 μ F, the capacitance of common mode capacitance Cy1, Cy2, Cy3, Cy4, Cy5, Cy6 is all selected 1.2nF, the inductance value of common mode inductance Lc1, Lc2 all is chosen as 8mH, and the inductance value of differential mode inductance Ld1, Ld2 all is chosen as 110uH.According to the said elements parameter, common mode insertion loss, differential mode insertion loss as shown in Figures 2 and 3, can find out that the electromagnetic interference signal for the typical electromagnetic interference frequency range of 10KHZ ~ 30MHZ has very high insertion loss and good inhibition.
Claims (1)
1. a driving power prime EMI filter protective circuit, comprise the thermo-sensitive resistor for driving power soft start and overcurrent protection, it is characterized in that: an end of the first piezo-resistance is linked into the live wire end of AC network input by fuse, the other end of the first piezo-resistance is linked into the zero line side of AC network input by thermo-sensitive resistor, the common port of the first piezo-resistance and fuse is connected to the earth by the second piezo-resistance, the common port of the first piezo-resistance and thermo-sensitive resistor is connected to the earth by the 3rd piezo-resistance, the first differential mode capacitor is in parallel with the first piezo-resistance, the first common mode capacitance is in parallel with the second piezo-resistance, the second common mode capacitance is in parallel with the 3rd piezo-resistance, two inputs of the common mode choke be comprised of the first common mode inductance and the second common mode inductance are connected to respectively the two ends of the first differential mode capacitor, two outputs of common mode choke are connected to respectively the two ends of the second differential mode capacitor, one end of the second differential mode capacitor is connected to the earth by the 3rd common mode capacitance, and the other end is connected to the earth by the 4th common mode capacitance, one end of the 3rd differential mode capacitor is connected to the ungrounded end of the 3rd common mode capacitance by the first differential mode inductance, the other end is connected to the ungrounded end of the 4th common mode capacitance by the second differential mode inductance, the 5th common mode capacitance and the 6th common mode capacitance are all feedthrough capacitors, its earth terminal all is connected to the earth, one of them punching end of the 5th common mode capacitance is connected to the common port of the first differential mode inductance and the 3rd differential mode capacitor, the first output that another punching end is this circuit, one of them punching end of the 6th common mode capacitance is connected to the common port of the second differential mode inductance and the 3rd differential mode capacitor, the second output that another punching end is this circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204247004U CN203339949U (en) | 2013-07-17 | 2013-07-17 | Driving power supply forestage EMI filtering protection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204247004U CN203339949U (en) | 2013-07-17 | 2013-07-17 | Driving power supply forestage EMI filtering protection circuit |
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| CN203339949U true CN203339949U (en) | 2013-12-11 |
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| CN2013204247004U Expired - Fee Related CN203339949U (en) | 2013-07-17 | 2013-07-17 | Driving power supply forestage EMI filtering protection circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368377A (en) * | 2013-07-17 | 2013-10-23 | 华南理工大学 | Preceding-stage EMI filtering protective circuit of driving power source |
| CN105244841A (en) * | 2015-11-12 | 2016-01-13 | 杭州电子科技大学 | CAN-based electric fire monitoring device |
| CN106505842A (en) * | 2016-10-19 | 2017-03-15 | 飞亚达（集团）股份有限公司 | Airborne DC source |
| CN110212534A (en) * | 2019-05-24 | 2019-09-06 | 江苏理工学院 | A kind of New-energy electric vehicle charge control system electromagnetic interference filter circuit |
| CN110233580A (en) * | 2019-07-08 | 2019-09-13 | 广州市凯辉电子有限公司 | A kind of high power constant compresses switch power supply |
| CN111884500A (en) * | 2020-08-03 | 2020-11-03 | 中车青岛四方车辆研究所有限公司 | Method for suppressing common-mode conducted interference of vehicle-mounted charger |
-
2013
- 2013-07-17 CN CN2013204247004U patent/CN203339949U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103368377A (en) * | 2013-07-17 | 2013-10-23 | 华南理工大学 | Preceding-stage EMI filtering protective circuit of driving power source |
| CN105244841A (en) * | 2015-11-12 | 2016-01-13 | 杭州电子科技大学 | CAN-based electric fire monitoring device |
| CN106505842A (en) * | 2016-10-19 | 2017-03-15 | 飞亚达（集团）股份有限公司 | Airborne DC source |
| CN106505842B (en) * | 2016-10-19 | 2019-09-10 | 飞亚达（集团）股份有限公司 | Airborne DC power supply |
| CN110212534A (en) * | 2019-05-24 | 2019-09-06 | 江苏理工学院 | A kind of New-energy electric vehicle charge control system electromagnetic interference filter circuit |
| CN110233580A (en) * | 2019-07-08 | 2019-09-13 | 广州市凯辉电子有限公司 | A kind of high power constant compresses switch power supply |
| CN111884500A (en) * | 2020-08-03 | 2020-11-03 | 中车青岛四方车辆研究所有限公司 | Method for suppressing common-mode conducted interference of vehicle-mounted charger |
| CN111884500B (en) * | 2020-08-03 | 2022-02-22 | 中车青岛四方车辆研究所有限公司 | Method for suppressing common-mode conducted interference of vehicle-mounted charger |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20131211 Termination date: 20160717 |