CN208737867U - A kind of anti-jamming circuit, circuit board and LED display device - Google Patents
A kind of anti-jamming circuit, circuit board and LED display device Download PDFInfo
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- CN208737867U CN208737867U CN201821312665.6U CN201821312665U CN208737867U CN 208737867 U CN208737867 U CN 208737867U CN 201821312665 U CN201821312665 U CN 201821312665U CN 208737867 U CN208737867 U CN 208737867U
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Abstract
The utility model discloses a kind of anti-jamming circuit, circuit board and LED display devices, are related to electromagnetic interference technical field, which includes first order filter circuit, second level filter circuit and third level filter circuit；First order filter circuit, second level filter circuit and third level filter circuit are sequentially connected in series, and are inhibited for the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range.The technical problem that existing anti-jamming circuit inhibits high-frequency noise effect difference is solved using above-mentioned anti-jamming circuit, to improve the inhibitory effect to the ELECTROMAGNETIC RADIATION SIGNATURE of different frequency range.
Description
Technical field
The utility model embodiment be related to electromagnetic interference technical field more particularly to a kind of anti-jamming circuit, circuit board and
LED display device.
Background technique
When Switching Power Supply works, the power semiconductor and energy transmission magnetic device HF switch of power converter, which act, to be produced
Raw electric current and voltage change necessarily leads to a large amount of frequency range and makes an uproar from several kHz to tens megahertzs of frequency electromagnetic waves
Acoustic jamming signal, not only causes electromagnetic radiation pollution, has an effect on the normal work of other electronic equipments.According to electromagnetic interference signal
Amplitude and phase difference, form the electromagnetic interference source of two kinds of forms of common mode and differential mode.Common mode interference be two cablings and
Interference, DM EMI caused by potential difference between PCB ground wire refer to that interference voltage is present between signal wire and its loop line
Interference.Electromagnetic interference signal injects power grid by input AC line, so that interference is connected to other equipment of access power grid.Hair
Bright people has found that existing anti-jamming circuit cannot reach better frequency noise suppression in practice process.
Utility model content
In view of this, the utility model embodiment provides a kind of anti-jamming circuit, circuit board and LED display device, with solution
Certainly prior art anti-jamming circuit inhibits the technical problem of high-frequency noise effect difference, to improve the electromagnetic radiation letter to different frequency range
Number inhibitory effect.
In a first aspect, the utility model embodiment provides a kind of anti-jamming circuit, for LED driving display equipment, packet
It includes: first order filter circuit, second level filter circuit and third level filter circuit；The first order filter circuit, the second level
Filter circuit and third level filter circuit are sequentially connected in series, and are inhibited for the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range.
Wherein, the second level filter circuit is identical as the third level filter circuit.
The filter circuit includes common mode inductance and capacitor, is connected in parallel between firewire and zero curve, and the common mode inductance is used for
Inhibit suppression common mode electromagnetic interference signal, the capacitor is for inhibiting differential mode electromagnetic interference signal.
Further, the first order filter circuit includes: common mode inductance LC100 and capacitor CX101；
The first end of the capacitor CX101 is connected to firewire, the capacitor via the first coil of common mode inductance LC100
The second end of CX101 is connected to zero curve via the second coil of the common mode inductance LC100.
Further, the second level filter circuit include: common mode inductance LC101, capacitor CX100, capacitor CY101 and
Capacitor CY103；
The capacitor CX100 and capacitor CX101 is in parallel, and the first end of the capacitor CY101 is via common mode inductance
The first coil of LC100 is connected to firewire, and the second end of the capacitor CY101 is connected to ground wire, and the first of the capacitor CY103
End is connected to zero curve via the second coil of common mode inductance LC100, and the second end of the capacitor CY103 is connected to ground wire, described
The first coil of common mode inductance LC101 is connected to firewire, the common mode inductance via the first coil of common mode inductance LC100
The second coil of LC101 is connected to zero curve via the second coil of common mode inductance LC100.
Further, the third level filter circuit include: common mode inductance LC102, capacitor CX102, capacitor CY100 and
Capacitor CY102；
The first end of the capacitor CX102 is successively via the first coil of common mode inductance LC101, common mode inductance LC100
First coil is connected to firewire, and the second end of the capacitor CX102 is successively via the second coil of common mode inductance LC101, common mode
The second coil of inductance LC100 is connected to zero curve, and the first end of the capacitor CY100 is successively via the of common mode inductance LC101
One coil, common mode inductance LC100 first coil be connected to firewire, the second end of the capacitor CY100 is connected to ground wire, described
The first end of capacitor CY102 is connected to zero via the second coil of common mode inductance LC101, the second coil of common mode inductance LC100
The second end of line, the capacitor CY102 is connected to ground wire.
It further, further include leadage circuit, the leadage circuit, for discharging for filter capacitor；
The leadage circuit includes resistance R101, resistance R102, resistance R109 and resistance R110, the resistance R101's
The of the first coil and common mode inductance LC100 of first end and the first end of resistance R102 connection common mode inductance LC101
The first end of node between one coil, the first end of the resistance R109 and the resistance R110 are connected to common mode inductance
Node between the second coil of LC101 and the second coil of common mode inductance LC100, the second end of the resistance R101, resistance
The second end of the second end of R102, the second end of resistance R109 and resistance R110 is connected.
Further, further include current insurance silk, be set to fire-wire interfaces and common mode inductance LC101 first coil it
Between, it is used for overload protection.
Further, further include varistor, be set to after the current insurance silk, for inhibiting abnormal over-voltage, protect
Protect the anti-jamming circuit；
The varistor and capacitor CX101 are in parallel.
Further, the anti-jamming circuit include a power interface, power interface respectively include zero line, zero line side and
Ground terminal, zero line is for being connected to firewire, ground terminal for connecting ground wire, and zero line side is for connecting zero curve.
Second aspect, the utility model embodiment provide a kind of circuit board, including anti-interference electricity described in first aspect
Road.
The third aspect, the utility model embodiment provide a kind of LED display device, including circuit described in second aspect
Plate.
A kind of anti-jamming circuit, circuit board and the LED display device of above-mentioned offer, the anti-jamming circuit include: the first order
Filter circuit, second level filter circuit and third level filter circuit；First order filter circuit, second level filter circuit and
Three-level filtering circuit is sequentially connected in series, and is inhibited for the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range, is realized using three-level common mode electricity
Sense composition filter circuit inhibits the ELECTROMAGNETIC RADIATION SIGNATURE of different frequency range, improves the inhibitory effect of high frequency noise.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram for anti-jamming circuit that the utility model embodiment one provides；
Fig. 2 is a kind of circuit diagram for anti-jamming circuit that the utility model embodiment one provides；
Fig. 3 is a kind of structural schematic diagram for circuit board that the utility model embodiment two provides.
Specific embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than the restriction to the utility model.It further needs exist for
It is bright, part relevant to the utility model is illustrated only for ease of description, in attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is a kind of structural schematic diagram for anti-jamming circuit that the utility model embodiment one provides.As shown in Figure 1, should
Anti-jamming circuit includes: first order filter circuit 110, second level filter circuit 120 and third level filter circuit 130；First
Grade filter circuit 110, second level filter circuit 120 and third level filter circuit 130 are sequentially connected in series, for different frequency range
ELECTROMAGNETIC RADIATION SIGNATURE is inhibited.
First order filter circuit 110, second level filter circuit 120 and third level filter circuit 130 are by a series of total
Mould inductance and capacity cell composition, to inhibit the ELECTROMAGNETIC RADIATION SIGNATURE of different frequency range.The anti-jamming circuit application of the present embodiment
In PC plate card, electromagnetic interference (Electromagnetic Interference, EMI) filter action is played, for inhibiting high speed
The electromagnetic wave outside radiation that signal wire generates.Common mode inductance can regard a bidirectional filter as, on the one hand filter out signal
On the other hand suppression common mode electromagnetic interference on line inhibits itself not send out electromagnetic interference, avoids influencing under same electromagnetic environment it
The normal work of his electronic equipment.
Common mode inductance is wound on same iron core by two coils and forms, and two coil turns are identical with phase, coiling direction
On the contrary.When the normal signal electric current in electric current flows through common mode inductance, electric current generates instead in the inductance coil of same-phase coiling
To magnetic field and cancel out each other, normal signal electric current is mainly influenced by coil resistance at this time；When there is common mode current flowing through coil
When, due to the same tropism of common mode current, understands the induction reactance that generate magnetic field in the same direction in coil and increase coil, show as coil
High impedance generates stronger damping, successively attenuation common-mode electric current, achievees the purpose that filtering.The first filter in the present embodiment
Wave circuit 110, the second filter circuit 120 and third filter circuit 130 can respectively include two groups of low-pass filters, so that
Common mode EMI signal on route is controlled on very low level.First filter circuit 110, the second filter circuit 120 and
The EMI signal that three filter circuits 130 can not only inhibit external is incoming, but can decay route itself work when the EMI letter that generates
Number, EMI interference strength can be effectively reduced.
In the present embodiment, the first filter circuit 110, the second filter circuit 120 and third filter circuit 130 are successively gone here and there
Connection, wherein the band limits that the first filter circuit 110 mainly filters are as follows: 150KHz--10MHz；Second filter circuit 120 and
The filtering band limits of third filter circuit 130 are as follows: 10MHz--30MHz.It is sequentially connected in series by using three-level filtering circuit, it is real
Now to the inhibition of the ELECTROMAGNETIC RADIATION SIGNATURE of different frequency range.In practical applications, level Four filter circuit or more also can be used
Filter circuit is sequentially connected in series to realize that the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range inhibits.
A kind of anti-jamming circuit provided in this embodiment, including first order filter circuit, second level filter circuit and
Three-level filtering circuit；First order filter circuit, second level filter circuit and third level filter circuit are sequentially connected in series, for not
ELECTROMAGNETIC RADIATION SIGNATURE with frequency range is inhibited, and forms filter circuit to the electricity of different frequency range using three-level common mode inductance to realize
Magnetic radiation signal is inhibited.
Fig. 2 is a kind of circuit diagram for anti-jamming circuit that the utility model embodiment one provides.In above-described embodiment
On the basis of provide a kind of optinal plan of physical circuit, as shown in Fig. 2, first order filter circuit includes: common mode inductance
LC100 and capacitor CX101；The first end of capacitor CX101 is connected to firewire via the first coil of common mode inductance LC100, electricity
The second end for holding CX101 is connected to zero curve via the second coil of common mode inductance LC100.
First filter circuit of common mode inductance LC100 and capacitor CX101 composition, wherein capacitor CX101 is for filtering out differential mode
Signal, common mode inductance LC100 are used for filtering common mode signal.There are the identical electric currents in direction between firewire and zero curve, are differential mode
Interference electric current.Due to signal lead impedance discontinuity etc., DM EMI electric current can be converted to common-mode interference current.Work as direction
Identical electric current can generate the further transmitting that very big impedance hinders common-mode interference current when flowing through common mode inductance LC100, from
And inhibit common-mode signal.In addition, first order filter circuit in embodiment is close to ac output end and far from electromagnetic interference source, from
And the influence of electromagnetic interference source is reduced in layout.
It should be noted that first order filter circuit can also further filter out common mode interference including two Y capacitances, wherein
The first end of one Y capacitance is connected to firewire, and second end is connected to ground wire, and the first end of another Y capacitance is connected to zero curve, the
Two ends are connected to ground wire.In view of being preferably laid out cabling in the present embodiment, do not changing filter circuit low frequency insertion loss
Characteristic it is technical, further decrease volume and cost, on first order filter circuit omit setting Y capacitance.
On the basis of the above embodiments, with continued reference to Fig. 2, second level filter circuit includes: common mode inductance LC101, electricity
Hold CX100, capacitor CY101 and capacitor CY103；Capacitor CX100 and capacitor CX101 is in parallel, the first end of capacitor CY101 via
The first coil of common mode inductance LC100 is connected to firewire, and the second end of capacitor CY101 is connected to ground wire, and the first of capacitor CY103
End is connected to zero curve via the second coil of common mode inductance LC100, and the second end of capacitor CY103 is connected to ground wire, common mode inductance
The first coil of LC101 is connected to firewire, the second coil of common mode inductance LC101 via the first coil of common mode inductance LC100
Zero curve is connected to via the second coil of common mode inductance LC100.
On the basis of the above embodiments, with continued reference to Fig. 2, third level filter circuit includes: common mode inductance LC102, electricity
Hold CX102, capacitor CY100 and capacitor CY102；The first end of capacitor CX102 is successively via the First Line of common mode inductance LC101
Circle, common mode inductance LC100 first coil be connected to firewire, the second end of capacitor CX102 is successively via common mode inductance LC101's
Second coil, common mode inductance LC100 the second coil be connected to zero curve, the first end of capacitor CY100 is successively via common mode inductance
The first coil of LC101, the first coil of common mode inductance LC100 are connected to firewire, and the second end of capacitor CY100 is connected to the ground
The first end of line, capacitor CY102 is connected to via the second coil of common mode inductance LC101, the second coil of common mode inductance LC100
The second end of zero curve, the capacitor CY102 is connected to ground wire.
In the present embodiment, second level filter circuit is identical with the circuit structure of third level filter circuit, common mode inductance
LC101 and LC102 is mainly used for inhibiting the common mode interference between signal wire and zero curve, and signal wire is connected to firewire, while capacitor
CY101, capacitor CY103, capacitor CY100 and capacitor CY102 are mainly used for filtering common mode signal.Capacitor CX100 and capacitor CX102
It is mainly used for filtering out difference mode signal.It should be noted that the anti-jamming circuit is on PCB trace, to being connected to firewire and ground wire
Between and the capacitor CY101 between zero curve and ground wire, capacitor CY103, capacitor CY100 and capacitor CY102 cabling will be as far as possible
It is short, to reduce the transmission path of electromagnetic interference.Common mode inductance LC100, LC101 and LC102 cabling increases leadage circuit, can improve
The filtering and inhibiting effect of the electromagnetic interference source of two kinds of forms of high frequency electromagnetic radiation signal and difference mode/common mode.
On the basis of the above embodiments, with continued reference to Fig. 2, which further includes leadage circuit, for being filter
Wave capacitor discharges.
Wherein, leadage circuit includes resistance R101, resistance R102, resistance R109 and resistance R110, and the of resistance R101
The first end of one end and resistance R102 connect the first coil of common mode inductance LC101 and the first coil of common mode inductance LC100
Between node, the first end of resistance R109 and the first end of resistance R110 are connected to the second coil of common mode inductance LC101
Node between the second coil of common mode inductance LC100, the second end of resistance R101, the second end of resistance R102, resistance
The second end of R109 and the second end of resistance R110 are connected.
Wherein, filter capacitor includes capacitor CX100, capacitor CX101 and capacitor CX102, the voltage of these filter capacitors
It does not reduce immediately, but is slowly reduced by load discharge when power is off, so that accumulating too many charge in filter capacitor.
Leadage circuit quickly bleeds off the charge stored on filter capacitor, reduces the voltage on filter capacitor quickly.Leadage circuit is simultaneously
The both ends of filter capacitor are associated in, play a part of to protect circuit.When booting powers on, the voltage of filter circuit output end may
Peak value can be increased to because of zero load, so that filter capacitor punctures because voltage is excessive, after parallel connection connects leadage circuit, leadage circuit
On resistance value it is appropriate, the output end of filter circuit is there are certain load, and voltage does not rise to peak value when load variation, thus
It avoids filter capacitor breakdown, plays a certain protective role.
On the basis of the above embodiments, which further includes current insurance silk, is set to fire-wire interfaces and is total to
Between the first coil of mould inductance LC101, it to be used for overload protection.
When the current anomaly in anti-jamming circuit increases, when temperature is increased to a certain degree, fuse itself fuses and cuts
Electric current is changed, plays the role of protecting circuit.
On the basis of the above embodiments, which further includes varistor, is set to the current insurance silk
Later, for inhibiting abnormal over-voltage, the anti-jamming circuit is protected；Varistor and capacitor CX101 are in parallel.
Varistor is a kind of resistance device with nonlinear wind vibration, be mainly used for circuit bear over-voltage when into
Row voltage clamping absorbs extra electric current to protect Sensitive Apparatus.Varistor is arranged after current insurance silk, can combine
Fuse plays better protective effect to circuit.Varistor parallel connection in circuit, when varistor both ends voltage occur
When change dramatically, varistor fuses current insurance silk, plays a protective role.In addition, varistor is also used to power supply over-voltage
Protection and pressure stabilizing, specifically, the electric current for flowing through it is minimum, its phase when the voltage being added on varistor is lower than its threshold value
When in the resistance of a resistance value infinity.That is, it is equivalent to one when the voltage being added in above it is lower than its threshold value
The switch of off-state.When the voltage being added on varistor is more than its threshold value, the electric current for flowing through it increases sharply, it is equivalent to
The infinitesimal resistance of resistance value.That is, it is equivalent to a closed state when the voltage being added in above it is higher than its threshold value
Switch play the effect of pressure stabilizing to prevent the overtension of power supply.
On the basis of the above embodiments, which includes a power interface, and power interface respectively includes firewire
End, zero line side and ground terminal, zero line is for being connected to firewire, ground terminal for connecting ground wire, and zero line side is for connecting zero curve.
Firewire and zero curve are all the lines of electrification, and ground wire is protective wire, obstructed overcurrent, are connected with the metal shell of electrical equipment
It connects, body leakage is guarded against, to protect the safety of people.
Embodiment two
Fig. 3 is a kind of structural schematic diagram for circuit board that the utility model embodiment two provides, as shown in figure 3, this implementation
In example, circuit board includes the utility model anti-jamming circuit 210 provided by the above embodiment.
The technical solution of the present embodiment provides a kind of circuit board, including anti-jamming circuit, which includes first
Grade filter circuit, second level filter circuit and third level filter circuit；First order filter circuit, second level filter circuit and
Third level filter circuit is sequentially connected in series, and is inhibited for the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range, total using three-level to realize
Mould inductance composition filter circuit inhibits the ELECTROMAGNETIC RADIATION SIGNATURE of different frequency range, by the anti-jamming circuit far from power source internal
High-frequency Interference source setting, it is compact-sized, inhibit high frequency noise effect it is good.
On the basis of the above embodiments, circuit board further include: current rectifying and wave filtering circuit 220；
Current rectifying and wave filtering circuit 220 is connect with anti-jamming circuit 210, the electric signal for exporting to the anti-jamming circuit 210
Carry out rectifying and wave-filtering.
On the basis of the above embodiments, circuit board further include: circuit of power factor correction 230, DC/DC conversion circuit
240, non-isolated PWM power circuit 250, power factor control circuit 260 and half-bridge resonance control circuit 270, described in realizing
The power drives and signal processing of circuit board.
Specifically, circuit of power factor correction 230 is connect with DC/DC conversion circuit 240, for being DC/DC conversion circuit
240 provide voltage V_BUCK as feedback.
Wherein, circuit of power factor correction 230 is handled for PFC, improves power service efficiency；Electricity
Pressing V_BUCK is by treated the output voltage of circuit of power factor correction 230.DC/DC conversion circuit 240 is that direct current turns straight
Current circuit is mainly used for voltage V_BUCK being converted to satisfactory output voltage, specifically, the size of voltage V_BUCK is
The voltage of 4V is converted to the output voltage of 2V by DC/DC conversion circuit by 4V.
Circuit of power factor correction 230 is also connect with non-isolated PWM power circuit 250, for being non-isolated PWM power supply electricity
Road 250 provides voltage V_BUCK as feedback.
Non-isolated PWM power circuit 250 connects with power factor control circuit 260 and half-bridge resonance control circuit 270 respectively
It connects, for providing voltage VCC1 as supply voltage for power factor control circuit 260 and half-bridge resonance control circuit 270.Its
In, the voltage V_BUCK obtained from power factor correction circuit is converted voltage VCC1 by non-isolated PWM power circuit 250, and then will
Voltage VCC1 is input to the supply voltage input terminal of power factor control circuit 260 and half-bridge resonance control circuit 270.By setting
Setting non-isolated PWM power circuit 250 is that power factor control circuit 260 and half-bridge resonance control circuit 270 are powered, reduce due to
Power supply instability caused by the variation of input voltage and output loading, further, it is ensured that in cold-starting and high temperature
The reliability and stability powered under the environment such as high humidity.
Power factor control circuit 260 is connect with circuit of power factor correction 230, is used for circuit of power factor correction
230 transmitting signal PFC-DRV and signal PFC_ZCD.
Wherein, power factor control circuit 260 transmits signal PFC-DRV and signal to circuit of power factor correction 230
PFC_ZCD, wherein signal PFC-DRV is for the field-effect tube in driving power factor correcting circuit 230, to realize power
The variation of internal circuit logic in factor correcting circuit 230, to realize the effect of PFC, signal PFC_ZCD is used
In indicating zero current detection state, and then the setting of 260 internal circuit logic of feedback adjustment power factor control circuit, accordingly adjust
Entire signal PFC-DRV.
Half-bridge resonance control circuit 270 is connect with DC/DC conversion circuit 240, for driving DC/DC conversion circuit 240.
Wherein, include half-bridge resonance circuit in DC/DC conversion circuit 240, include field-effect tube in half-bridge resonance circuit, partly
Bridge resonant control circuit is used to control the folding of field-effect tube in half-bridge resonance circuit, to realize the effect of synchronous rectification.Through
Output voltage after crossing the conversion of DC/DC conversion circuit loads in load, is load supplying.
On the basis of the above embodiments, circuit board further include: output filter circuit 280.
Output filter circuit 280 is connect with DC/DC conversion circuit 240, for after the conversion of DC/DC conversion circuit
Output voltage is filtered.
On the basis of the above embodiments, circuit board further include: output voltage feed circuit 290.
Output voltage feed circuit 290 is connected between output filter circuit 280 and half-bridge resonance control circuit 270, is used
In obtaining the output voltage after the conversion of DC/DC conversion circuit from output filter circuit 280, and to half-bridge resonance control circuit
270 transmitting output voltage feedback signals, specifically, the size of the output voltage after DC/DC conversion circuit is converted is 4.2V.
It should be noted that in actual circuit, there are positive and negative 5% for the actual output voltage after the conversion of DC/DC conversion circuit
It floats, i.e., actual output voltage is 4.2 ± 0.2V.
On the basis of the above embodiments, circuit board further include: output overvoltage control circuit 2100.
Output overvoltage control circuit 2100 is connected between output filter circuit 280 and half-bridge resonance control circuit 270, is used
In obtaining the output voltage after the conversion of DC/DC conversion circuit from output filter circuit 280, and to half-bridge resonance control circuit
270 feedback output over-voltages control signal, specifically, the output voltage size after DC/DC conversion circuit is converted is 4.2V.It needs
It is noted that in actual circuit, actual output voltage after the conversion of DC/DC conversion circuit there are positive and negative 5% it is floating
Dynamic, i.e., actual output voltage is 4.2 ± 0.2V.
Embodiment three
In the present embodiment, LED display device includes the circuit board of above-described embodiment.
The technical solution of the present embodiment, for LED driving display equipment, including first order filter circuit, second level filtering
Circuit and third level filter circuit；First order filter circuit, second level filter circuit and third level filter circuit are successively gone here and there
Connection, inhibits for the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range, forms filter circuit pair using three-level common mode inductance to realize
The ELECTROMAGNETIC RADIATION SIGNATURE of different frequency range is inhibited, meanwhile, which can be arranged adjacent to power interface, far from electricity
High-frequency Interference source inside source, to preferably inhibit high frequency noise.
Note that above are only the preferred embodiment and institute's application technology principle of the utility model.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, is able to carry out for a person skilled in the art various bright
Aobvious variation, readjustment and substitution is without departing from the protection scope of the utility model.Therefore, although passing through above embodiments
The utility model is described in further detail, but the utility model is not limited only to above embodiments, is not departing from
It can also include more other equivalent embodiments in the case that the utility model is conceived, and the scope of the utility model is by appended
Scope of the claims determine.
Claims (12)
1. a kind of anti-jamming circuit, which is characterized in that for LED driving display equipment, comprising: first order filter circuit, second
Grade filter circuit and third level filter circuit；The first order filter circuit, second level filter circuit and third level filtering
Circuit is sequentially connected in series, and is inhibited for the ELECTROMAGNETIC RADIATION SIGNATURE to different frequency range.
2. anti-jamming circuit according to claim 1, which is characterized in that the second level filter circuit and the third level
Filter circuit is identical.
3. anti-jamming circuit according to claim 1, which is characterized in that the filter circuit includes common mode inductance and electricity
Hold, be connected in parallel between firewire and zero curve, the common mode inductance is for inhibiting suppression common mode electromagnetic interference signal, and the capacitor is for inhibiting
Differential mode electromagnetic interference signal.
4. anti-jamming circuit according to claim 3, which is characterized in that the first order filter circuit includes: common mode electricity
Feel LC100 and capacitor CX101；
The first end of the capacitor CX101 is connected to firewire, the capacitor via the first coil of the common mode inductance LC100
The second end of CX101 is connected to zero curve via the second coil of the common mode inductance LC100.
5. anti-jamming circuit according to claim 4, which is characterized in that the second level filter circuit includes: common mode electricity
Feel LC101, capacitor CX100, capacitor CY101 and capacitor CY103；
The capacitor CX100 and capacitor CX101 is in parallel, and the first end of the capacitor CY101 is via the common mode inductance
The first coil of LC100 is connected to firewire, and the second end of the capacitor CY101 is connected to ground wire, and the first of the capacitor CY103
End is connected to zero curve via the second coil of the common mode inductance LC100, and the second end of the capacitor CY103 is connected to ground wire,
The first coil of the common mode inductance LC101 is connected to firewire, the common mode via the first coil of the common mode inductance LC100
The second coil of inductance LC101 is connected to zero curve via the second coil of the common mode inductance LC100.
6. anti-jamming circuit according to claim 5, which is characterized in that the third level filter circuit includes: common mode electricity
Feel LC102, capacitor CX102, capacitor CY100 and capacitor CY102；
The first end of the capacitor CX102 is successively via the first coil of the common mode inductance LC101, the common mode inductance
The first coil of LC100 is connected to firewire, and the second end of the capacitor CX102 is successively via the of the common mode inductance LC101
Two coil, the common mode inductance LC100 the second coil be connected to zero curve, the first end of the capacitor CY100 is successively via institute
The first coil of the first coil, the common mode inductance LC100 of stating common mode inductance LC101 is connected to firewire, the capacitor CY100
Second end be connected to ground wire, the first end of the capacitor CY102 via the common mode inductance LC101 the second coil, described
The second coil of common mode inductance LC100 is connected to zero curve, and the second end of the capacitor CY102 is connected to ground wire.
7. anti-jamming circuit according to claim 6, which is characterized in that further include leadage circuit, the leadage circuit is used
It discharges in for filter capacitor；
The leadage circuit includes resistance R101, resistance R102, resistance R109 and resistance R110, and the first of the resistance R101
End and the resistance R102 first end connect the common mode inductance LC101 first coil and the common mode inductance LC100
First coil between node, the first end of the first end of the resistance R109 and the resistance R110 are connected to described total
Node between the second coil of mould inductance LC101 and the second coil of the common mode inductance LC100, the of the resistance R101
Two ends, the second end of resistance R102, the second end of the second end of resistance R109 and resistance R110 are connected.
8. anti-jamming circuit according to claim 7, which is characterized in that further include current insurance silk, be set to firewire and connect
Between mouth and the first coil of common mode inductance LC101, it to be used for overload protection.
9. anti-jamming circuit according to claim 8, which is characterized in that further include varistor, be set to the electric current
After fuse, for inhibiting abnormal over-voltage, the anti-jamming circuit is protected；
The varistor and capacitor CX101 are in parallel.
10. anti-jamming circuit according to claim 9, which is characterized in that further include a power interface, power interface difference
Including zero line, zero line side and ground terminal, for being connected to firewire, ground terminal for connecting ground wire, zero line side is used for zero line
Connect zero curve.
11. a kind of circuit board, which is characterized in that including the described in any item anti-jamming circuits of claim 1-10.
12. a kind of LED display device, which is characterized in that including the circuit board described in claim 11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821312665.6U CN208737867U (en) | 2018-08-14 | 2018-08-14 | A kind of anti-jamming circuit, circuit board and LED display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821312665.6U CN208737867U (en) | 2018-08-14 | 2018-08-14 | A kind of anti-jamming circuit, circuit board and LED display device |
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| CN208737867U true CN208737867U (en) | 2019-04-12 |
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| CN201821312665.6U Active CN208737867U (en) | 2018-08-14 | 2018-08-14 | A kind of anti-jamming circuit, circuit board and LED display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110474525A (en) * | 2019-08-21 | 2019-11-19 | 北京华商三优新能源科技有限公司 | Charging unit including silicon carbide charging module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110474525A (en) * | 2019-08-21 | 2019-11-19 | 北京华商三优新能源科技有限公司 | Charging unit including silicon carbide charging module |
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