CN104882870A - Lightning protection circuit - Google Patents
Lightning protection circuit Download PDFInfo
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- CN104882870A CN104882870A CN201510093731.XA CN201510093731A CN104882870A CN 104882870 A CN104882870 A CN 104882870A CN 201510093731 A CN201510093731 A CN 201510093731A CN 104882870 A CN104882870 A CN 104882870A
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Abstract
The invention discloses a lightning protection circuit, which belongs to the technical field of power supply protection. The lightning protection circuit comprises an electromagnetic compatibility EMC filtering circuit and a voltage clamping circuit, wherein the voltage clamping circuit is connected in parallel with two ends of a winding of a common-mode inductor in the EMC filtering circuit; and the voltage clamping circuit is conducted when an induced voltage of the common-mode inductor exceeds an action voltage corresponding to the voltage clamping circuit, and clamps the induced voltage to a clamping voltage corresponding to the voltage clamping circuit. The lightning protection circuit provided by the invention can prevent a power supply module from being burnt down and avoid outbreak of fire in a power supply cabinet.
Description
Technical field
The present invention relates to power protection field, particularly a kind of lightning protection circuit.
Background technology
At present, power module is arranged in power supply cabinet usually, may be struck by lightning at thunderstorm season power supply cabinet, in order to avoid the infringement of being struck by lightning to the power module in power supply cabinet, needs to arrange lightning protection circuit in power module.
As Figure 1-1, a kind of lightning protection circuit is there is in prior art, comprise: EMC (Electro Magnetic Compatibility, Electro Magnetic Compatibility) filter circuit 1 (part in figure beyond dotted line frame) and common mode protection circuit S2 (part in figure within dotted line frame).EMC filter circuit 1 comprises the 3rd piezo-resistance RV3, the first common mode inductance L1, the first fuse F1, the second fuse F2, the first electric capacity C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4 and the 5th electric capacity C5.Common mode protection circuit S2 comprises the first gas discharge tube G1, the first piezo-resistance RV1 and the second piezo-resistance RV2.Wherein, first fuse F1, first electric capacity C1 is all connected with live wire with one end of the second electric capacity C2, the other end of the second electric capacity C2 is connected with ground wire, the other end of the first electric capacity C1, 3rd electric capacity C3 is all connected with zero line with one end of the second fuse F2, the other end of the 3rd electric capacity C3 is connected with ground wire, the other end of the first fuse F1 and the 3rd piezo-resistance RV3, one end of first winding of the second piezo-resistance RV2 and the first common mode inductance L1 connects, one end of second winding of the other end of the second fuse F2 and the other end of the 3rd piezo-resistance RV3 and the first piezo-resistance RV1 and the first common mode inductance L1 is connected, first piezo-resistance RV1 is connected with one end of the first gas discharge tube G1 with the other end of the second piezo-resistance RV2, the other end of the first gas discharge tube G1 is connected with ground wire, one end of 4th electric capacity C4 is connected with the other end of first winding of the first common mode inductance L1, the other end of the 4th electric capacity C4 is connected with ground wire, one end of 5th electric capacity C5 is connected with the other end of second winding of the first common mode inductance L1, and the other end of the 5th electric capacity C5 is connected with ground wire.
When being struck by lightning, at live wire and ground wire, zero line and ground wire and very large thunderbolt voltage between live wire and zero line, can be produced, and very large thunder-strike current can be produced on live wire and zero line, thunder-strike current along live wire and zero line flowing, and flows along common mode protection circuit S2 to ground wire.Wherein, after thunderbolt voltage is elevated to the operation voltage higher than the first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1, first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1 meeting conducting, i.e. common mode protection circuit S2 conducting, after conducting, thunder-strike current is got back to ground wire bypass from the first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1, and by the clamped voltage value of thunderbolt voltage clamping at the first piezo-resistance RV1 and the second piezo-resistance RV2.So make all to be limited in less value by the electric current of late-class circuit and voltage, to protect late-class circuit not damaged, thus reach the effect of lightning protection.
Realizing in process of the present invention, inventor finds that prior art at least exists following problem:
When excessive thunder-strike current flows through common mode protection circuit S2, along with the prolongation first gas discharge tube G1 of time and the first piezo-resistance RV1 and the second piezo-resistance RV2 can generate heat on fire, cause power module to be burnt, even cause power supply cabinet breaking out of fire.
Summary of the invention
In order to avoid power module is burnt, and avoid power supply cabinet breaking out of fire, the invention provides a kind of lightning protection circuit.Described technical scheme is as follows:
First aspect, a kind of lightning protection circuit, described lightning protection circuit comprises:
Electro Magnetic Compatibility EMC filter circuit and voltage clamp circuit;
Described voltage clamp circuit is connected in parallel on the two ends of a winding of the common mode inductance in described EMC filter circuit;
After the induced voltage of described common mode inductance exceedes operation voltage corresponding to described voltage clamp circuit, described voltage clamp circuit conducting, and by described induced voltage clamper at clamp voltage corresponding to described voltage clamp circuit.
In conjunction with first aspect, in the first implementation of above-mentioned first aspect,
Described voltage clamp circuit comprises clamps;
One end of described clamps is connected with one end of a described winding, and the other end of described clamps is connected with the other end of a described winding.
In conjunction with the first implementation of first aspect, in the second implementation of above-mentioned first aspect,
Described clamps comprises gas discharge tube, Transient Suppression Diode, piezo-resistance or electric capacity.
In conjunction with the first implementation of first aspect, in the third implementation of above-mentioned first aspect,
Described voltage clamp circuit also comprises resistance;
One end of described resistance is connected with one end of a described winding, and the other end of described resistance is connected with one end of described clamps, and the other end of described clamps is connected with the other end of a described winding.
In conjunction with first aspect, in the 4th kind of implementation of above-mentioned first aspect,
Described lightning protection circuit comprises multiple voltage clamp circuit, and described EMC filter circuit comprises multiple common mode inductance, voltage clamp circuit and common mode inductance one_to_one corresponding, and the voltage clamp circuit of described common mode inductance two ends its correspondence in parallel.
In conjunction with first aspect, in the 5th kind of implementation of above-mentioned first aspect, described lightning protection circuit also comprises coupling winding;
Described coupling winding is wrapped on the magnetic core of described common mode inductance, and one end of described coupling winding is connected with one end of described voltage clamp circuit, and the other end of described coupling winding is connected with the other end of described voltage clamp circuit.
In embodiments of the present invention, lightning protection circuit comprises EMC filter circuit and voltage clamp circuit; This voltage clamp circuit is connected in parallel on the two ends of a winding of the common mode inductance in EMC filter circuit; After the induced voltage of this common mode inductance exceedes operation voltage corresponding to this voltage clamp circuit, this voltage clamp circuit conducting, and by this induced voltage clamper at clamp voltage corresponding to this voltage clamp circuit.The two ends of a winding of common mode inductance are connected in parallel on due to voltage clamp circuit, make live wire and ground wire and all do not form loop between zero line and ground wire, therefore thunder-strike current cannot flow to ground wire from live wire or flow to ground wire from zero line, thus avoid thunder-strike current and flow through live wire and ground wire or the components and parts between zero line and ground wire for a long time, avoid the heating of these components and parts on fire, and then avoid power module and burnt or power supply cabinet breaking out of fire.
Accompanying drawing explanation
Fig. 1-1 is the schematic diagram of a kind of lightning protection circuit that prior art provides;
Fig. 1-2 is the first schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 2 is the second schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 3 is the 3rd schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 4 is the 4th schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 5 is the 5th schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 6 is the 6th schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 7 is the 7th schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 8 is the 8th schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Fig. 9 is the 9th schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Figure 10 is the tenth schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Figure 11 is the 11 schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Figure 12 is the 12 schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Figure 13 is the 13 schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Figure 14 is the 14 schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 1 provides;
Figure 15 is the first schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 2 provides;
Figure 16 is the second schematic diagram of a kind of lightning protection circuit that the embodiment of the present invention 2 provides.
In accompanying drawing, the list of parts representated by each label is as follows:
1:EMC filter circuit, 2 and 3: voltage clamp circuit, 21: clamps, S2: common mode protection circuit,
F1: the first fuse, the F2: the second fuse, the R1: the first resistance,
C1: the first electric capacity, the C2: the second electric capacity, the C3: the three electric capacity, the C4: the four electric capacity, the C5: the five electric capacity, the C6: the six electric capacity, the C7: the seven electric capacity, the C8: the eight electric capacity,
RV1: the first piezo-resistance, the RV2: the second piezo-resistance, the RV3: the three piezo-resistance, the RV4: the four piezo-resistance,
G1: the first gas discharge tube, the G2: the second gas discharge tube,
L1: the first common mode inductance, the L2: the second common mode inductance, the W1: the first coupling winding, the W2: the second coupling winding,
RT1: thermistor, TVS1: Transient Suppression Diode.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment 1
As shown in Fig. 1-2 and 2, embodiments provide a kind of lightning protection circuit, comprising: EMC filter circuit 1 and voltage clamp circuit 2.
Voltage clamp circuit 2 is connected in parallel on the two ends of a winding of the first common mode inductance L1 in EMC filter circuit 1, in Fig. 1-2, voltage clamp circuit 2 is connected in parallel on the two ends of first winding of the first common mode inductance L1, and in Fig. 2, voltage clamp circuit 2 is connected in parallel on the two ends of second winding of the first common mode inductance L1;
After the induced voltage of the first common mode inductance L1 exceedes the operation voltage of voltage clamp circuit 2 correspondence, voltage clamp circuit 2 conducting, and by the clamp voltage of this induced voltage clamper in voltage clamp circuit 2 correspondence.
Wherein, voltage clamp circuit 2 has operation voltage and the clamp voltage of its correspondence.When the voltage at voltage clamp circuit 2 two ends is less than or equal to its operation voltage, voltage clamp circuit 2 is in off-state, when the voltage at voltage clamp circuit 2 two ends is greater than its operation voltage, voltage clamp circuit 2 conducting, electric current flow in late-class circuit through voltage clamp circuit 2.If now the voltage at voltage clamp circuit 2 two ends continues to increase, voltage clamp circuit 2 can carry out clamper to the voltage at its two ends, by the clamp voltage of the voltage clamping at its two ends in its correspondence.
Wherein, when this lightning protection circuit is struck by lightning, at live wire and ground wire, live wire and zero line and very large thunderbolt voltage between zero line and ground wire, can be produced, and very large thunder-strike current can be produced on live wire and zero line, the thunder-strike current of pulse flows through the first common mode inductance L1, and due to the change of electric current, can make the first common mode inductance L1 induces very high induced voltage.Due to first winding parallel of voltage clamp circuit 2 and the first common mode inductance L1, then the voltage at voltage clamp circuit 2 two ends is also this induced voltage, and this induced voltage is very large, considerably beyond the operation voltage of voltage clamp circuit 2 correspondence.Voltage clamp circuit 2 carries out clamper to the voltage at its two ends, by the clamp voltage of the voltage clamping at its two ends in its correspondence.This clamp voltage is far smaller than the induced voltage of the first common mode inductance L1, thus avoids the first common mode inductance L1 and induce higher voltage, reduces the harm of thunderbolt to power module, reaches the effect of lightning protection.
In addition, owing to eliminating the first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1 that prior art comprises as the common mode protection circuit S2 in Fig. 1-1, make live wire and ground wire and all do not form loop between zero line and ground wire, therefore thunder-strike current cannot flow to ground wire from live wire or flow to ground wire from zero line, thus avoid thunder-strike current and flow through live wire and ground wire or the components and parts between zero line and ground wire for a long time, avoid the heating of these components and parts on fire, and then avoid power module and burnt or power supply cabinet breaking out of fire.
Wherein, as shown in Figure 3, voltage clamp circuit 2 comprises clamps 21, and one end of clamps 21 is connected with one end of first winding of the first common mode inductance L1, and the other end of clamps 21 is connected with the other end of first winding of the first common mode inductance L1.Wherein, clamps 21 has operation voltage and clamp voltage, when the voltage at the first winding two ends is greater than the operation voltage of clamps 21, clamps 21 can by the clamp voltage of the voltage clamping at the first winding two ends at clamps 21, to avoid the first common mode inductance L1 to induce higher voltage, avoid the harm that power module is caused of being struck by lightning.
Wherein, in embodiments of the present invention, clamps 21 comprises the components and parts that gas discharge tube, Transient Suppression Diode, piezo-resistance or electric capacity etc. have clamping performance.The components and parts with clamping performance all have operation voltage and clamp voltage, can carry out clamper to the voltage at components and parts two ends.
As shown in Figure 4, clamps 21 is the second gas discharge tube G2, and one end of the second gas discharge tube G2 is connected with one end of first winding of the first common mode inductance L1, and the other end of the second gas discharge tube G2 is connected with the other end of the first winding.The voltage at the second gas discharge tube G2 two ends is less than its operation voltage at the beginning, second gas discharge tube G2 is open circuit, when lightning protection circuit is struck by lightning, the induced voltage of the first common mode inductance L1 is more than the operation voltage of the second gas discharge tube G2, second gas discharge tube G2 punctures conducting, electric current flow to late-class circuit from the second gas discharge tube G2, now the second gas discharge tube G2 by the voltage clamping at the first common mode inductance L1 two ends at its clamp voltage, to avoid the first common mode inductance L1 to induce higher voltage, avoid the harm that power module is caused of being struck by lightning.
Preferably, the second gas discharge tube G2 selects the gas discharge tube of low pressure small area analysis capacity, by the gas discharge tube of low pressure small area analysis capacity by the induced voltage clamper of the first common mode inductance L1 at a less clamp voltage.
As shown in Figure 5, clamps 21 is Transient Suppression Diode TVS1, and one end of Transient Suppression Diode TVS1 is connected with one end of first winding of the first common mode inductance L1, and the other end of Transient Suppression Diode TVS1 is connected with the other end of the first winding.The voltage at Transient Suppression Diode TVS1 two ends is less than its operation voltage at the beginning, Transient Suppression Diode TVS1 is open circuit, when lightning protection circuit is struck by lightning, the induced voltage of the first common mode inductance L1 exceedes the operation voltage of Transient Suppression Diode TVS1, Transient Suppression Diode TVS1 punctures conducting, electric current flow to late-class circuit from Transient Suppression Diode TVS1, now Transient Suppression Diode TVS1 by the voltage clamping at the first common mode inductance L1 two ends at its clamp voltage, higher voltage is induced to avoid the first common mode inductance L1, avoid the harm that power module is caused of being struck by lightning.
As shown in Figure 6, clamps 21 is the 4th piezo-resistance RV4, and one end of the 4th piezo-resistance RV4 is connected with one end of first winding of the first common mode inductance L1, and the other end of the 4th piezo-resistance RV4 is connected with the other end of the first winding.The voltage at the 4th piezo-resistance RV4 two ends is less than its operation voltage at the beginning, the impedance of the 4th piezo-resistance RV4 is very large, voltage clamp circuit 2 is open circuits, when lightning protection circuit is struck by lightning, the induced voltage of the first common mode inductance L1 is more than the operation voltage of the 4th piezo-resistance RV4, it is very little that the impedance of the 4th piezo-resistance RV4 becomes, voltage clamp circuit 2 conducting, electric current flow to late-class circuit from the 4th piezo-resistance RV4, now the 4th piezo-resistance RV4 by the voltage clamping at the first common mode inductance L1 two ends at its clamp voltage, higher voltage is induced to avoid the first common mode inductance L1, avoid the harm that power module is caused of being struck by lightning.
As shown in Figure 7, clamps 21 is the 6th electric capacity C6, and one end of the 6th electric capacity C6 is connected with one end of first winding of the first common mode inductance L1, and the other end of the 6th electric capacity C6 is connected with the other end of the first winding.Because the change of capacitance versus voltage has inhibitory action, when the first common mode inductance L1 induces very high induced voltage, 6th electric capacity C6 can suppress the voltage change ratio at its two ends, can by the voltage clamping at the 6th electric capacity C6 two ends a less value, to avoid the first common mode inductance L1 to induce higher voltage, avoid the harm that power module is caused of being struck by lightning.
Wherein, as shown in Figure 8, in embodiments of the present invention, voltage clamp circuit 2 also comprises the first resistance R1, one end of first resistance R1 is connected with one end of first winding of the first common mode inductance L1, the other end of the first resistance R1 is connected with one end of clamps 21, and the other end of clamps 21 is connected with the other end of the first winding.
Wherein, when lightning protection circuit is struck by lightning, because thunder-strike current is very large, the first common mode inductance L1 has the effect hindering electric current, so when after voltage clamp circuit 2 conducting, most thunder-strike current can flow to late-class circuit through voltage clamp circuit 2.In order to avoid excessive electric current is to the infringement of the components and parts in late-class circuit; the first resistance R1 is also comprised in voltage clamp circuit 2; first resistance R1 flows through the electric current of voltage clamp circuit 2 for decaying; to make the electric current after by voltage clamp circuit 2 diminish, thus protection late-class circuit is from the infringement of super-high-current.Wherein, the first resistance R1 can be thermistor or fixed resistance etc.
As shown in Figure 9, voltage clamp circuit 2 comprises the first resistance R1 and the second gas discharge tube G2, one end of first resistance R1 is connected with one end of first winding of the first common mode inductance L1, the other end of the first resistance R1 is connected with one end of the second gas discharge tube G2, and the other end of the second gas discharge tube G2 is connected with the other end of the first winding.Wherein, as shown in Figure 10, the first resistance R1 is thermistor RT1.
As shown in figure 11, voltage clamp circuit 2 comprises the first resistance R1 and Transient Suppression Diode TVS1, one end of first resistance R1 is connected with one end of first winding of the first common mode inductance L1, the other end of the first resistance R1 is connected with one end of Transient Suppression Diode TVS1, and the other end of Transient Suppression Diode TVS1 is connected with the other end of the first winding.
As shown in figure 12, voltage clamp circuit 2 comprises the first resistance R1 and the 4th piezo-resistance RV4, one end of first resistance R1 is connected with one end of first winding of the first common mode inductance L1, the other end of the first resistance R1 is connected with one end of the 4th piezo-resistance RV4, and the other end of the 4th piezo-resistance RV4 is connected with the other end of the first winding.
As shown in figure 13, voltage clamp circuit 2 comprises the first resistance R1 and the 6th electric capacity C6, one end of first resistance R1 is connected with one end of first winding of the first common mode inductance L1, the other end of the first resistance R1 is connected with one end of the 6th electric capacity C6, and the other end of the 6th electric capacity C6 is connected with the other end of the first winding.
Further, as shown in figure 14, this lightning protection circuit also comprises the first coupling winding W1, first coupling winding W1 is wrapped on the magnetic core of the first common mode inductance L1, one end of first coupling winding W1 is connected with one end of voltage clamp circuit 2, and the other end of the first coupling winding W1 is connected with the other end of voltage clamp circuit 2.
Wherein, the first common mode inductance L1 comprises magnetic core, the first winding and the second winding, and the first winding and the second winding are all around on same magnetic core.On this magnetic core again around on a winding, namely obtain the first coupling winding W1, and the first coupling winding number of turns of winding W1 on this magnetic core is all identical with the winding number of turns of the second winding with the first winding.Due to the electromagnetic induction characteristic of common mode inductance, identical around the induced voltage of all windings on same magnetic core with the same winding number of turns.So the first winding that the first common mode inductance L1 comprises is all identical with the voltage at the second winding and the first coupling winding W1 two ends.When the induced voltage at the first coupling winding W1 two ends exceedes the operation voltage of voltage clamp circuit 2 correspondence, the voltage of voltage clamp circuit 2 to the first coupling winding W1 two ends carries out clamper, by the clamp voltage of the voltage clamping at the first coupling winding W1 two ends in voltage clamp circuit 2 correspondence, thus make the voltage clamping at the first common mode inductance L1 two ends at this clamp voltage, to avoid the first common mode inductance L1 to induce higher voltage, avoid the harm that power module is caused of being struck by lightning.
Wherein, in embodiments of the present invention, common mode protection circuit S2 of the prior art is eliminated, the voltage clamp circuit 2 in parallel at winding two ends of the first common mode inductance L1.When have common mode be struck by lightning voltage be added in live wire to ground wire or zero line on ground wire time, because there is system thunder defending device (the present invention is not shown in FIG.) power module front end, the common-mode voltage arriving power module can control at below 4KV.When surge voltage is come, due to without original common mode protection circuit S2, the surge voltage of a 4KV is formed between live wire, zero line and primary side circuit are to ground wire, because surge voltage is a transient voltage, therefore a very high induced voltage can be induced on the first common mode inductance L1, this induced voltage is superimposed upon live wire, zero line and primary side circuit between ground wire, and the virtual voltage therefore in power module is much larger than 4KV, and this virtual voltage can cause damage to power module.In the present invention, at a winding two ends shunt voltage clamp circuit 2 of the first common mode inductance L1, can by the clamp voltage of the voltage clamping at common mode inductance two ends in this voltage clamp circuit 2 correspondence, usually in a few hectovolt.Thus make the common-mode voltage of primary side circuit to ground wire control to add this clamp voltage in 4KV surge voltage, coordinate PCB (Printed Circuit Board again, printed circuit board) fabric swatch controls primary side circuit to the creepage distance of insulation of ground wire, thus accomplish common mode surge isolating and protecting, eliminate common mode protection circuit S2, thus solve components and parts that common mode protection circuit comprises problem on fire.
In addition, in the prior art, the operation voltage of the gas discharge tube of common mode is generally below 1500V direct current, and the safety voltage-withstand test standard of power module is that 2121V direct current exchanges with 1500V.Before carrying out voltage-withstand test, need first the common mode earthing screw that gas discharge tube solder joint is connected with casing to be taken off.When power module being installed to electric press and testing withstand voltage cashier's office in a shop, also need to take off to by this common mode earthing screw.When so carrying out voltage-withstand test, process is very complicated.And in the present invention, eliminate common mode protection circuit, in lightning protection circuit provided by the invention, therefore there is not this common mode earthing screw, eliminating the step of taking off common mode earthing screw when carrying out voltage-withstand test, simplify test process.
In embodiments of the present invention, lightning protection circuit comprises EMC filter circuit and voltage clamp circuit; This voltage clamp circuit is connected in parallel on the two ends of a winding of the common mode inductance in EMC filter circuit; After the induced voltage of this common mode inductance exceedes operation voltage corresponding to this voltage clamp circuit, this voltage clamp circuit conducting, and by this induced voltage clamper at clamp voltage corresponding to this voltage clamp circuit.Owing to eliminating the first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1 that prior art comprises as the common mode protection circuit S2 in Fig. 1-1, make live wire and ground wire and all do not form loop between zero line and ground wire, therefore thunder-strike current cannot flow to ground wire from live wire or flow to ground wire from zero line, thus avoid thunder-strike current and flow through live wire and ground wire or the components and parts between zero line and ground wire for a long time, avoid the heating of these components and parts on fire, and then avoid power module and burnt or power supply cabinet breaking out of fire.
Embodiment 2
See Figure 15, embodiments provide a kind of lightning protection circuit, comprising: EMC filter circuit and multiple voltage clamp circuit;
EMC filter circuit comprises multiple common mode inductance, voltage clamp circuit and common mode inductance one_to_one corresponding, and the voltage clamp circuit of the two ends of a winding of common mode inductance its correspondence in parallel.
Wherein, after the induced voltage of common mode inductance exceedes operation voltage corresponding to the voltage clamp circuit of its correspondence, this voltage clamp circuit conducting, and by this induced voltage clamper at clamp voltage corresponding to this voltage clamp circuit.
Wherein, this lightning protection circuit comprises voltage clamp circuit 2 and 3 in fig .15, and EMC filter circuit comprises the first common mode inductance L1 and the second common mode inductance L2.This lightning protection circuit can also comprise more voltage clamp circuit, and EMC filter circuit can also comprise three or more common mode inductances.
Wherein, voltage clamp circuit has operation voltage and the clamp voltage of its correspondence.When the voltage at voltage clamp circuit two ends is less than or equal to its operation voltage, voltage clamp circuit is in off-state, when the voltage at voltage clamp circuit two ends is greater than its operation voltage, voltage clamp circuit conducting, electric current flow in late-class circuit through voltage clamp circuit.If now the voltage at voltage clamp circuit two ends continues to increase, voltage clamp circuit can carry out clamper to the voltage at its two ends, by the clamp voltage of the voltage clamping at its two ends in its correspondence.
Wherein, when this lightning protection circuit is struck by lightning, at live wire and ground wire, live wire and zero line and very large thunderbolt voltage between zero line and ground wire, can be produced, and very large thunder-strike current can be produced on live wire and zero line, the thunder-strike current of pulse flows through the first common mode inductance L1, and due to the change of electric current, can make the first common mode inductance L1 induces very high induced voltage.Due to a winding parallel of voltage clamp circuit 2 and the first common mode inductance L1, then the voltage at voltage clamp circuit 2 two ends is also this induced voltage, and this induced voltage is very large, considerably beyond the operation voltage of voltage clamp circuit 2 correspondence.Now voltage clamp circuit 2 conducting, thunder-strike current greatly flows through voltage clamp circuit 2, and along with the increase of voltage, voltage clamp circuit 2 carries out clamper to the voltage at its two ends, by the clamp voltage of the voltage clamping at its two ends in its correspondence.Because a winding of the first common mode inductance L1 is in parallel with voltage clamp circuit 2, so the voltage at the first common mode inductance L1 two ends also becomes this clamp voltage, this clamp voltage is far smaller than the induced voltage of the first common mode inductance L1.
Similarly, when electric current flows through the second common mode inductance L2, the second common mode inductance L2 also can induce very high induced voltage.One winding parallel of voltage clamp circuit 3 and the second common mode inductance L2, this induced voltage has exceeded the operation voltage of voltage clamp circuit 3 correspondence.Now voltage clamp circuit 3 conducting, electric current flows through voltage clamp circuit 3 greatly, and along with the increase of voltage, voltage clamp circuit 3 carries out clamper to the voltage at its two ends, by the clamp voltage of the voltage clamping at its two ends in its correspondence.Because a winding of the second common mode inductance L2 is in parallel with voltage clamp circuit 3, so the voltage at the second common mode inductance L2 two ends also becomes this clamp voltage, this clamp voltage is far smaller than the induced voltage of the second common mode inductance L2.The voltage in late-class circuit is so made to be the clamp voltage that thunderbolt voltage adds voltage clamp circuit 2 and 3, thus avoid the first common mode inductance L1 and the second common mode inductance L2 induces higher voltage, reduce the harm of thunderbolt to power module, reach the effect of lightning protection.
In addition, owing to eliminating the first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1 that prior art comprises as the common mode protection circuit S2 in Fig. 1-1, make live wire and ground wire and all do not form loop between zero line and ground wire, therefore thunder-strike current cannot flow to ground wire from live wire or flow to ground wire from zero line, thus avoid thunder-strike current and flow through live wire and ground wire or the components and parts between zero line and ground wire for a long time, avoid the heating of these components and parts on fire, and then avoid power module and burnt or power supply cabinet breaking out of fire.
Wherein, in embodiments of the present invention, each voltage clamp circuit in multiple voltage clamp circuits that this lightning protection circuit comprises is with the voltage clamp circuit in embodiment 1, each voltage clamp circuit comprises clamps, one end of one winding of the common mode inductance that one end of the clamps that voltage clamp circuit comprises is corresponding with this voltage clamp circuit connects, and the other end of this clamps is connected with the other end of this winding of this common mode inductance.When the voltage at these common mode inductance two ends is greater than the operation voltage of clamps, clamps can by the clamp voltage of the voltage clamping at these common mode inductance two ends at this clamps, to avoid this common mode inductance to induce higher voltage, avoid the harm that power module is caused of being struck by lightning.
Wherein, clamps can be the components and parts that gas discharge tube, Transient Suppression Diode, piezo-resistance or electric capacity etc. have clamping performance.The components and parts with clamping performance all have operation voltage and clamp voltage, can carry out clamper to the voltage at components and parts two ends.
Wherein, in embodiments of the present invention, each voltage clamp circuit in multiple voltage clamp circuits that this lightning protection circuit comprises is with the voltage clamp circuit in embodiment 1, each voltage clamp circuit also comprises resistance, one end of one winding of the common mode inductance that one end of the resistance that voltage clamp circuit comprises is corresponding with this voltage clamp circuit connects, the one end of the clamps that the other end of this resistance comprises with this voltage clamp circuit is connected, and the other end of this clamps is connected with the other end of this winding of this common mode inductance.
Wherein, when lightning protection circuit is struck by lightning, because thunder-strike current is very large, common mode inductance has the effect hindering electric current, so when after the voltage clamp circuit conducting that this common mode inductance is corresponding, most thunder-strike current can flow to late-class circuit through this voltage clamp circuit.In order to avoid excessive electric current is to the infringement of the components and parts in late-class circuit; also resistance is comprised in this voltage clamp circuit; this resistance flows through the electric current of this voltage clamp circuit for decaying; to make to be diminished by the electric current after this voltage clamp circuit, thus protection late-class circuit is from the infringement of super-high-current.Wherein, this resistance can be thermistor or fixed resistance etc.
Further, as shown in figure 16, this lightning protection circuit also comprises multiple coupling winding, coupling winding and common mode inductance one_to_one corresponding, and coupling winding is wrapped on the magnetic core of the common mode inductance of its correspondence, the one end of the voltage clamp circuit that one end of this coupling winding is corresponding with this common mode inductance connects, and the other end of this coupling winding is connected with the other end of this voltage clamp circuit.
Wherein, this lightning protection circuit comprises the first coupling winding W1 and second coupling winding W2 in figure 16.First coupling winding W1 is wrapped on the magnetic core of the first common mode inductance L1, and one end of the first coupling winding W1 is connected with one end of voltage clamp circuit 2, and the other end of the first coupling winding W1 is connected with the other end of voltage clamp circuit 2.Second coupling winding W2 is wrapped on the magnetic core of the second common mode inductance L2, and one end of the second coupling winding W2 is connected with one end of voltage clamp circuit 3, and the other end of the second coupling winding W2 is connected with the other end of voltage clamp circuit 3.
Wherein, due to the electromagnetic induction characteristic of common mode inductance, identical around the voltage of all windings on same magnetic core with the identical winding number of turns.So the voltage at other winding two ends of voltage and common mode inductance at coupling winding two ends is identical.When the induced voltage at winding two ends of being coupled exceedes operation voltage corresponding to voltage clamp circuit, the voltage of voltage clamp circuit to coupling winding two ends carries out clamper, by the voltage clamping at coupling winding two ends at clamp voltage corresponding to voltage clamp circuit, thus make the voltage clamping at common mode inductance two ends at this clamp voltage, to avoid common mode inductance to induce higher voltage, avoid the harm that power module is caused of being struck by lightning.
Wherein, in embodiments of the present invention, common mode protection circuit of the prior art is eliminated, the voltage clamp circuit in parallel at winding two ends of common mode inductance.When have common mode be struck by lightning voltage be added in live wire to ground wire or zero line on ground wire time, because there is system thunder defending device (the present invention is not shown in FIG.) power module front end, the common-mode voltage arriving power module can control at below 4KV.When surge voltage is come, due to without original common mode protection circuit, the surge voltage of a 4KV is formed between live wire, zero line and primary side circuit are to ground wire, because surge voltage is a transient voltage, therefore a very high induced voltage can be induced on common mode inductance, this induced voltage is superimposed upon live wire, zero line and primary side circuit between ground wire, and the virtual voltage therefore in power module is much larger than 4KV, and this virtual voltage can cause damage to power module.In the present invention, at a winding two ends shunt voltage clamp circuit of common mode inductance, can by the voltage clamping at common mode inductance two ends at clamp voltage corresponding to this voltage clamp circuit, usually in a few hectovolt.Thus make the common-mode voltage of primary side circuit to ground wire control to add this clamp voltage in 4KV surge voltage, coordinate PCB (Printed Circuit Board again, printed circuit board) fabric swatch controls primary side circuit to the creepage distance of insulation of ground wire, thus accomplish common mode surge isolating and protecting, eliminate common mode protection circuit, thus solve components and parts that common mode protection circuit comprises problem on fire.
In addition, in the prior art, the operation voltage of the gas discharge tube of common mode is generally below 1500V direct current, and the safety voltage-withstand test standard of power module is that 2121V direct current exchanges with 1500V.Before carrying out voltage-withstand test, need first the common mode earthing screw that gas discharge tube solder joint is connected with casing to be taken off.When power module being installed to electric press and testing withstand voltage cashier's office in a shop, also need to take off to by this common mode earthing screw.When so carrying out voltage-withstand test, process is very complicated.And in the present invention, eliminate common mode protection circuit, in lightning protection circuit provided by the invention, therefore there is not this common mode earthing screw, eliminating the step of taking off common mode earthing screw when carrying out voltage-withstand test, simplify test process.
In embodiments of the present invention, lightning protection circuit comprises EMC filter circuit and voltage clamp circuit; This voltage clamp circuit is connected in parallel on the two ends of a winding of the common mode inductance in EMC filter circuit; After the induced voltage of this common mode inductance exceedes operation voltage corresponding to this voltage clamp circuit, this voltage clamp circuit conducting, and by this induced voltage clamper at clamp voltage corresponding to this voltage clamp circuit.Owing to eliminating the first piezo-resistance RV1, the second piezo-resistance RV2 and the first gas discharge tube G1 that prior art comprises as the common mode protection circuit S2 in Fig. 1-1, make live wire and ground wire and all do not form loop between zero line and ground wire, therefore thunder-strike current cannot flow to ground wire from live wire or flow to ground wire from zero line, thus avoid thunder-strike current and flow through live wire and ground wire or the components and parts between zero line and ground wire for a long time, avoid the heating of these components and parts on fire, and then avoid power module and burnt or power supply cabinet breaking out of fire.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a lightning protection circuit, is characterized in that, described lightning protection circuit comprises:
Electro Magnetic Compatibility EMC filter circuit and voltage clamp circuit;
Described voltage clamp circuit is connected in parallel on the two ends of a winding of the common mode inductance in described EMC filter circuit;
After the induced voltage of described common mode inductance exceedes operation voltage corresponding to described voltage clamp circuit, described voltage clamp circuit conducting, and by described induced voltage clamper at clamp voltage corresponding to described voltage clamp circuit.
2. lightning protection circuit as claimed in claim 1, is characterized in that,
Described voltage clamp circuit comprises clamps;
One end of described clamps is connected with one end of a described winding, and the other end of described clamps is connected with the other end of a described winding.
3. lightning protection circuit as claimed in claim 2, is characterized in that,
Described clamps comprises gas discharge tube, Transient Suppression Diode, piezo-resistance or electric capacity.
4. lightning protection circuit as claimed in claim 2, is characterized in that,
Described voltage clamp circuit also comprises resistance;
One end of described resistance is connected with one end of a described winding, and the other end of described resistance is connected with one end of described clamps, and the other end of described clamps is connected with the other end of a described winding.
5. the lightning protection circuit as described in any one of claim 1-4 claim, is characterized in that,
Described lightning protection circuit comprises multiple voltage clamp circuit, and described EMC filter circuit comprises multiple common mode inductance, voltage clamp circuit and common mode inductance one_to_one corresponding, and the voltage clamp circuit of described common mode inductance two ends its correspondence in parallel.
6. the lightning protection circuit as described in any one of claim 1-4 claim, is characterized in that, described lightning protection circuit also comprises coupling winding;
Described coupling winding is wrapped on the magnetic core of described common mode inductance, and one end of described coupling winding is connected with one end of described voltage clamp circuit, and the other end of described coupling winding is connected with the other end of described voltage clamp circuit.
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| CN109390925A (en) * | 2019-01-03 | 2019-02-26 | 阳光电源股份有限公司 | Inverter lightning-protection method, circuit and device and grid-connected inverters system |
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| CN104882870B (en) | 2018-03-09 |
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