CN210898530U - Active GPS surge protection circuit of low residual voltage - Google Patents
Active GPS surge protection circuit of low residual voltage Download PDFInfo
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- CN210898530U CN210898530U CN201922218665.0U CN201922218665U CN210898530U CN 210898530 U CN210898530 U CN 210898530U CN 201922218665 U CN201922218665 U CN 201922218665U CN 210898530 U CN210898530 U CN 210898530U
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Abstract
The utility model discloses an active GPS surge protection circuit with low residual voltage, which comprises a first protection circuit of a power supply part and a second protection circuit of a signal part; the first protection circuit comprises a primary surge protection device ceramic gas discharge tube GDT1 and a secondary surge protection device transient suppression diode TVS1, wherein a self-recovery fuse PTC1, nH-level differential mode inductance L1 and uH-level differential mode inductance L2 are connected in series between the ceramic gas discharge tube GDT1 and the transient suppression diode TVS 1; the second protection circuit comprises a T-shaped filter circuit sharing the ceramic gas discharge tube GDT1 as a primary surge protection device and a secondary surge protection device. The utility model discloses contained the surge safeguard function of power supply unit and signal part, power supply unit and signal part all can bear the surge test of 1.2/50-8/20us combined wave 6KV/3 KA.
Description
Technical Field
The utility model relates to an active GPS port prevent surge technical field, especially an active GPS surge protection circuit of low residual voltage.
Background
Most of signals in an active GPS surge protection circuit used in the prior art are subjected to secondary absorption by adopting an electrostatic protection device, the clamping voltage is higher, junction capacitance of the device can attenuate a radio frequency signal to a certain extent, and most customers do not allow the device. Since the clamping voltage is high, the amplifier at the back end is easily damaged, and therefore a three-stage absorption circuit is often used, but the cost is increased.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, an active GPS surge protection circuit of low residual voltage is provided.
In order to solve the technical problem, the utility model discloses the technical scheme who takes is: a low residual voltage active GPS surge protection circuit comprises a first protection circuit of a power supply part and a second protection circuit of a signal part; the first protection circuit comprises a primary surge protection device ceramic gas discharge tube GDT1 and a secondary surge protection device transient suppression diode TVS1, wherein a self-recovery fuse PTC1, nH-level differential mode inductance L1 and uH-level differential mode inductance L2 are connected in series between the ceramic gas discharge tube GDT1 and the transient suppression diode TVS 1; the second protection circuit comprises a T-shaped filter circuit sharing the ceramic gas discharge tube GDT1 as a primary surge protection device and a secondary surge protection device.
In the above technical solution, a unidirectional diode D1 is further reversely connected between the first protection circuit and the power supply portion.
In the above technical solution, the T-type filter circuit includes capacitors C1 and C2 connected in series, and a node between the capacitors C1 and C2 is connected to an inductor L3 and then grounded.
In the technical scheme, the specification of the ceramic gas discharge tube GDT1 is SC2E5-90 LSMD; the specification of the transient suppression diode TVS1 is SMAJ5.0A; the specification of the self-healing fuse PTC1 is SCF 014-1812R.
The utility model has the advantages that: the signal part adopts a T-shaped filter circuit for secondary protection, the inductor adopts nH-level differential mode inductor, and the inductor is in a high-impedance state because the radio-frequency signal is a high-frequency signal, so that the phenomenon of packet loss of the signal cannot occur. But for the surge, the inductor shows a low resistance state, so the surge voltage can be clamped to be very low and normal communication is not influenced, and the cost can be greatly saved. The power supply part is connected with a Schottky diode in series, and the power supply IC at the rear end can not be damaged by overvoltage due to the unidirectional conduction characteristic of the diode. A self-recovery fuse PTC1 is also connected in series on the bus, when the load is abnormal, the fuse can cut off the power supply in time, and the work of the whole machine is not influenced.
Drawings
Fig. 1 is a schematic diagram of the circuit principle of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, an active GPS surge protection circuit with low residual voltage includes a first protection circuit of a power supply part and a second protection circuit of a signal part; the first protection circuit comprises a primary surge protection device ceramic gas discharge tube GDT1 and a secondary surge protection device transient suppression diode TVS1, wherein a self-recovery fuse PTC1, nH-level differential mode inductance L1 and uH-level differential mode inductance L2 are connected in series between the ceramic gas discharge tube GDT1 and the transient suppression diode TVS 1; the second protection circuit comprises a T-shaped filter circuit sharing the ceramic gas discharge tube GDT1 as a primary surge protection device and a secondary surge protection device. A unidirectional diode D1 is also connected in reverse between the first protection circuit and the power supply section. The T-shaped filter circuit comprises capacitors C1 and C2 which are connected in series, and the node between the capacitors C1 and C2 is connected with the inductor L3 and then is grounded. The specification of the ceramic gas discharge tube GDT1 is SC2E5-90 LSMD; the specification of the transient suppression diode TVS1 is SMAJ5.0A; the specification of the self-healing fuse PTC1 is SCF 014-1812R. Since SMAJ5.0A TVS is selected as TVS1, the clamping voltage is within 9.2V, and the withstand voltage of the diode is higher than 9.2V.
The utility model discloses a theory of operation:
the protection circuit is used for an active GPS port, the surge protection functions of a power supply part and a signal part are exchanged, and the power supply part and the signal part can bear the surge test of 6KV/3KA of a combined wave of 1.2/50-8/20 us. The power supply part adopts a 90V ceramic gas discharge tube GDT1 as a first-stage surge protection, the second stage adopts a 400W 5V unidirectional transient suppression diode TVS1, and the decoupling mode adopts a self-recovery fuse PTC1 and a differential mode inductor L2 (generally 22 uH). The signal part shares the ceramic gas discharge tube GDT1 as a first-stage protection, and the T-shaped filter circuit is used as a second stage, so that the residual voltage can be effectively reduced. The inductor adopts nH-level inductor, which can prevent the RF signal from flowing away from the power supply without affecting the RF signal.
A power supply part
When the differential mode surge is impacted from the power supply part of the GPS, because the first stage adopts the ceramic gas discharge tube GDT1 with large through-flow, most surge current can be discharged, the second stage adopts the high-power transient suppression diode SMAJ5.0A with 400W, the effect of accurate clamping can be achieved, the self-recovery fuse PTC1 and the differential mode inductor L2 (generally 22 uH) are used as decoupling, the surge protection effect is good, and when the TVS1 is in short circuit, the PTC1 can cut off the power supply, an inductor with nH level is connected in series in the middle, and the radio frequency signal can be prevented from flowing away to the power supply part.
In addition, a diode D1 is connected in series with the power supply part, and due to the unidirectional conductivity of the diode, overvoltage can be ensured not to damage a power supply IC at the rear end.
Two, signal part
When differential mode surge is impacted from a signal part of a GPS, the ceramic gas discharge tube GDT1 with large through current of the first stage can discharge most surge current, the T-shaped filter circuit is adopted in the second stage, the inductor L3 adopts nH-level inductance differential mode inductor, and as the radio-frequency signal is a high-frequency signal, the inductor is in a high-impedance state, and the signal cannot be lost. However, for the surge, the inductor shows a low resistance state, so that the surge voltage can be clamped to be very low and normal communication is not influenced, the amplifier at the rear end can be well protected by the lower clamping voltage, and the self-recovery fuse PTC1 and the coupling capacitor are used as decoupling in the middle.
The above embodiments are merely illustrative and not restrictive, and all equivalent changes and modifications made by the methods described in the claims are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides an active GPS surge protection circuit of low residual voltage which characterized in that: a first guard circuit including a power supply section and a second guard circuit including a signal section; the first protection circuit comprises a primary surge protection device ceramic gas discharge tube GDT1 and a secondary surge protection device transient suppression diode TVS1, wherein a self-recovery fuse PTC1, nH-level differential mode inductance L1 and uH-level differential mode inductance L2 are connected in series between the ceramic gas discharge tube GDT1 and the transient suppression diode TVS 1; the second protection circuit comprises a T-shaped filter circuit sharing the ceramic gas discharge tube GDT1 as a primary surge protection device and a secondary surge protection device.
2. The active GPS surge protection circuit of claim 1, wherein: a unidirectional diode D1 is also connected in reverse between the first protection circuit and the power supply section.
3. The active GPS surge protection circuit of claim 1, wherein: the T-shaped filter circuit comprises capacitors C1 and C2 which are connected in series, and the node between the capacitors C1 and C2 is connected with the inductor L3 and then is grounded.
4. The active GPS surge protection circuit of claim 1, wherein: the specification of the ceramic gas discharge tube GDT1 is SC2E5-90 LSMD; the specification of the transient suppression diode TVS1 is SMAJ5.0A; the specification of the self-healing fuse PTC1 is SCF 014-1812R.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922218665.0U CN210898530U (en) | 2019-12-12 | 2019-12-12 | Active GPS surge protection circuit of low residual voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922218665.0U CN210898530U (en) | 2019-12-12 | 2019-12-12 | Active GPS surge protection circuit of low residual voltage |
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| CN210898530U true CN210898530U (en) | 2020-06-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201922218665.0U Active CN210898530U (en) | 2019-12-12 | 2019-12-12 | Active GPS surge protection circuit of low residual voltage |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934299A (en) * | 2020-09-21 | 2020-11-13 | 中国电子科技网络信息安全有限公司 | Miniaturized high-power microwave protection device |
| CN112952785A (en) * | 2021-01-27 | 2021-06-11 | 杭州爱科科技股份有限公司 | Surge protection circuit |
-
2019
- 2019-12-12 CN CN201922218665.0U patent/CN210898530U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934299A (en) * | 2020-09-21 | 2020-11-13 | 中国电子科技网络信息安全有限公司 | Miniaturized high-power microwave protection device |
| CN112952785A (en) * | 2021-01-27 | 2021-06-11 | 杭州爱科科技股份有限公司 | Surge protection circuit |
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