CN214850474U - Surge protection circuit for preventing lightning stroke of RF port - Google Patents
Surge protection circuit for preventing lightning stroke of RF port Download PDFInfo
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- CN214850474U CN214850474U CN202121191395.XU CN202121191395U CN214850474U CN 214850474 U CN214850474 U CN 214850474U CN 202121191395 U CN202121191395 U CN 202121191395U CN 214850474 U CN214850474 U CN 214850474U
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Abstract
The utility model belongs to the technical field of the power electronics and specifically relates to a surge protection circuit for lightning protection is hit to RF port is related to, and this surge protection circuit is used for high-speed signal RF port, including one-level protection circuit, second grade protection circuit and T type filter circuit, one-level protection circuit, second grade protection circuit and T type filter circuit are parallelly connected, and T type filter circuit includes electric capacity C2, inductance L1, electric capacity C3, electric capacity C2 and electric capacity C3 are established ties, and inductance L1 one end is connected between electric capacity C2 and electric capacity C3, other end ground connection. The utility model discloses adopt T type filter circuit at tertiary protection circuit, earlier series capacitance connects in parallel again and falls to the ground the inductance and establish ties electric capacity's mode again promptly, and the high frequency inductance that falls to the ground of nH rank demonstrates the high resistance state to the high frequency signal of RF port, consequently can not cause the packet loss of signal, leads surge voltage directly toward the ground wire, and consequently clamp voltage can be very low, can effectual suppression surge peak voltage.
Description
Technical Field
The utility model belongs to the technical field of power electronics and specifically relates to a surge protection circuit for RF port lightning protection is hit is related to.
Background
At present, in a direct current power input or related power system, in order to prevent a negative surge from causing damage to a subsequent circuit and equipment, a surge protection circuit is usually arranged between a direct current input end and the subsequent circuit, power supply of the subsequent circuit is timely turned off when the negative surge occurs, and surge current is discharged through a voltage dependent resistor (VR) or a Transient Voltage Suppressor (TVS), so that surge protection of the subsequent circuit is realized.
Most of RF port surge protection circuits used in the industry at present adopt a two-stage segmented absorption circuit, the clamping voltage is higher, an amplifier at the rear end is easy to damage, even if a three-stage protection circuit is adopted in the industry, a static protector is also adopted at the third stage, the clamping voltage is about 10V, the amplifier at the rear end is not allowed, the more the static protectors are, the larger the junction capacitance is, and the more serious the signal packet loss is.
SUMMERY OF THE UTILITY MODEL
In order to solve the problem, the utility model provides a surge protection circuit for RF port lightning protection adopts T type filter circuit at tertiary protection circuit, and the mode of capacitor that falls to the ground inductance of establishing ties earlier and establishing ties again promptly connects in parallel, and nH rank falls to the ground high frequency inductance, to the high frequency signal (1 GHz) of RF port, demonstrates the high resistance state, consequently can not cause the packet loss of signal, with surge voltage directly toward ground wire, therefore clamp voltage can be very low, can effectual suppression surge peak voltage.
A surge protection circuit for preventing an RF port from being struck by lightning is used for a high-speed signal RF port and comprises a primary protection circuit, a secondary protection circuit and a T-shaped filter circuit, wherein the primary protection circuit, the secondary protection circuit and the T-shaped filter circuit are connected in parallel;
the primary protection circuit comprises a ceramic gas discharge tube;
the secondary protection circuit comprises an electrostatic protector and a blocking capacitor C1, two ends of the electrostatic protector are respectively connected with the blocking capacitor C1 and the ground, and the blocking capacitor C1 is used for decoupling;
the T-shaped filter circuit comprises a capacitor C2, an inductor L1 and a capacitor C3, wherein the capacitor C2 is connected with the capacitor C3 in series, one end of the inductor L1 is connected between the capacitor C2 and the capacitor C3, and the other end of the inductor L1 is grounded.
As a further aspect of the present invention: the ceramic gas discharge tube is SC2E5-90 LSMD.
As a further aspect of the present invention: the model adopted by the electrostatic protector is SE03D3D01 GW.
As a further aspect of the present invention: the flow rate of the electrostatic protector can be up to 17A.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses follow-on RF port surge protection circuit, tertiary protection circuit adopts T type filter circuit, and the mode of electric capacity is established ties again to the electric capacity that falls to the ground that connects in parallel earlier promptly, nH rank fall to the ground high frequency inductance, to the high frequency signal (1 GHz) of RF port, demonstrate the high resistance state, consequently can not cause the packet loss of signal. However, for surge voltage with relatively low frequency, the low resistance state is shown, and the surge voltage is directly conducted to the ground, so that the clamping voltage is very low, and the surge peak voltage can be effectively inhibited. The nH-level ground inductor is adopted, the problem of junction capacitance is hardly considered, so that the influence on signals is extremely small, and the signals are not easy to lose packets. Therefore, the improved surge protection circuit of the RF port has the advantages of low clamping voltage, low cost and small junction capacitance, and is the choice of most products.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a surge protection circuit for preventing lightning at an RF port is used for a high-speed signal RF port, and can withstand a surge test of 6kV of combined waves of 1.2/50-8/20us, and the surge protection circuit is connected between a power supply and an electronic device, and includes a first-stage protection circuit, a second-stage protection circuit and a T-type filter circuit, and the first-stage protection circuit, the second-stage protection circuit and the T-type filter circuit are connected in parallel.
Wherein, the primary protection circuit adopts a ceramic gas discharge tube with a large current type of 90V and the model number of SC2E5-90 LSMD.
Preferably, the second-stage protection circuit adopts an electrostatic protector with a higher reaction speed, the second-stage protection circuit is further connected with a blocking capacitor C1 for decoupling, and the blocking capacitor C1 is connected between the ceramic gas discharge tube and the electrostatic protector in parallel. The capacitive reactance of the blocking capacitor C1 can play a certain current limiting role, and can protect the electrostatic protector at the rear end from being damaged easily.
Preferably, the T-type filter circuit comprises a capacitor C2, an inductor L1 and a capacitor C3, wherein the capacitor C2 is connected in series with the capacitor C3, one end of the inductor L1 is connected between the capacitor C2 and the capacitor C3, and the other end is grounded. The surge protection circuit enters from a signal line of an RF port, most surge current can firstly pass through a first-stage large-current-type ceramic gas discharge tube, and the rest surge current can flow into the electrostatic protector at the rear end, because the blocking capacitor C1 is adopted in the middle as decoupling, the capacitive reactance of the blocking capacitor C1 can play a certain current limiting role, the electrostatic protector at the rear end can be protected from being damaged easily, the electrostatic protector adopts an ESD model of SOD-323 encapsulation as 03D3D01GW, the through-flow rate is up to 17A, the surge level is high, and the breakdown is not easy.
Because the amplifiers of the RF ports generally have lower withstand voltage, a three-stage protection circuit is added, and the three-stage protection circuit adopts a T-type filter circuit, that is, a capacitor C2 is connected in series, then a grounding inductor L1 is connected in parallel, and then a capacitor C3 is connected in series, and then the signals enter the amplifier at the rear end, and the grounding inductor L1 at nH level shows a high-impedance state for the high-frequency signals of the RF ports, so that the loss of the signals is not caused. But for the surge voltage with relatively low frequency, the low resistance state is shown, and the surge peak voltage can be effectively suppressed.
The utility model discloses follow-on RF port surge protection circuit, tertiary protection circuit adopts T type filter circuit, and earlier series capacitance C2 connects in parallel again and falls to the ground inductance L1, series capacitance C3's mode again, nH rank fall to the ground high frequency inductance L1 to the high frequency signal (1 GHz) of RF port, demonstrate the high resistance state, consequently can not cause the packet loss of signal. However, for surge voltage with relatively low frequency, the low resistance state is shown, and the surge voltage is directly conducted to the ground, so that the clamping voltage is very low, and the surge peak voltage can be effectively inhibited. The nH-level ground inductor is adopted, the problem of junction capacitance is hardly considered, so that the influence on signals is extremely small, and the signals are not easy to lose packets. Therefore, the improved surge protection circuit of the RF port has the advantages of low clamping voltage, low cost and small junction capacitance.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (4)
1. A surge protection circuit for preventing an RF port from being struck by lightning is used for a high-speed signal RF port and is characterized by comprising a primary protection circuit, a secondary protection circuit and a T-shaped filter circuit, wherein the primary protection circuit, the secondary protection circuit and the T-shaped filter circuit are connected in parallel;
the primary protection circuit comprises a ceramic gas discharge tube;
the secondary protection circuit comprises an electrostatic protector and a blocking capacitor C1, two ends of the electrostatic protector are respectively connected with the blocking capacitor C1 and the ground, and the blocking capacitor C1 is used for decoupling;
the T-shaped filter circuit comprises a capacitor C2, an inductor L1 and a capacitor C3, wherein the capacitor C2 is connected with the capacitor C3 in series, one end of the inductor L1 is connected between the capacitor C2 and the capacitor C3, and the other end of the inductor L1 is grounded.
2. The surge protection circuit of claim 1, wherein said ceramic gas discharge tube is of the type SC2E5-90 LSMD.
3. The surge protection circuit according to claim 1, wherein said electrostatic protector is model SE03D3D01 GW.
4. The surge protection circuit of claim 3, wherein the electrostatic protector has a current capacity of up to 17A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121191395.XU CN214850474U (en) | 2021-05-31 | 2021-05-31 | Surge protection circuit for preventing lightning stroke of RF port |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121191395.XU CN214850474U (en) | 2021-05-31 | 2021-05-31 | Surge protection circuit for preventing lightning stroke of RF port |
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| Publication Number | Publication Date |
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| CN214850474U true CN214850474U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202121191395.XU Active CN214850474U (en) | 2021-05-31 | 2021-05-31 | Surge protection circuit for preventing lightning stroke of RF port |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123149A (en) * | 2021-11-26 | 2022-03-01 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing enhanced port electrostatic protection |
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2021
- 2021-05-31 CN CN202121191395.XU patent/CN214850474U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123149A (en) * | 2021-11-26 | 2022-03-01 | 上海创远仪器技术股份有限公司 | Circuit structure for realizing enhanced port electrostatic protection |
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