CN217486162U - Overcurrent protection circuit of antenna - Google Patents
Overcurrent protection circuit of antenna Download PDFInfo
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- CN217486162U CN217486162U CN202122578297.8U CN202122578297U CN217486162U CN 217486162 U CN217486162 U CN 217486162U CN 202122578297 U CN202122578297 U CN 202122578297U CN 217486162 U CN217486162 U CN 217486162U
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Abstract
The utility model discloses an overcurrent protection circuit of antenna, include: the input end of the power switch module is connected to the power supply circuit, and the output end of the power switch module is connected to the power receiving end of the antenna; the overcurrent detection module is arranged between the power supply module and the input end of the power switch module; and a first input end of the state feedback module is connected with a signal output end of the overcurrent detection module, a second input end of the state feedback module is connected with an external controller, a feedback end of the state feedback module is connected with a signal input end of the controller, and an output end of the state feedback module is connected with a control end of the power switch module. The beneficial effects of the utility model reside in that: the whole circuit adopts a hardware circuit to realize overcurrent detection, state feedback and switch-on and switch-off, has high control efficiency and better stability, and effectively avoids the antenna from being burnt down due to overcurrent faults. Meanwhile, the state feedback end is arranged to feed back an overcurrent signal to the vehicle networking controller, and effective closed-loop control between the vehicle networking controller and the power supply is facilitated.
Description
Technical Field
The utility model relates to a power supply circuit technical field, concretely relates to overcurrent protection circuit of antenna.
Background
The concept of the internet of vehicles is derived from the internet of things, namely the internet of vehicles, vehicles and people, vehicles and roads, vehicles and service platforms are connected through networks by using running vehicles as information sensing objects and by means of a new-generation information communication technology, the overall intelligent driving level of the vehicles is improved, safe, comfortable, intelligent and efficient driving feeling and traffic service are provided for users, meanwhile, the traffic operation efficiency is improved, and the intelligent level of social traffic service is improved. Under the general condition, for realizing better car networking communication effect, car networking communication equipment can adopt the mode of feeder to draw the antenna to the automobile body surface, avoids bearing the formula automobile body and produces the shielding effect to radio signal. In a mobile communication system, an active antenna integrates a radio frequency part of a base station into the antenna, and adopts the matching of multi-channel radio frequency and an antenna array to realize space beam forming and complete the receiving and transmitting of radio frequency signals. Each active unit, in addition to functioning as a radiation/reception unit for radiating/receiving electromagnetic signals, also functions as a part of a circuit, such as resonance, filtering, power amplification, etc. The active antenna is sensitive to the supply current due to the complicated analog/digital circuits, and when the input current is too large, the circuit in the antenna is easily damaged.
The overcurrent protection circuit for the active antenna part of the car networking equipment is often lacked in the prior art.
SUMMERY OF THE UTILITY MODEL
In view of the above problems in the prior art, an overcurrent protection circuit for an antenna is provided.
The specific technical scheme is as follows:
an overcurrent protection circuit for an antenna, comprising:
the input end of the power switch module is connected to an external power supply circuit, and the output end of the power switch module is connected to the power receiving end of the antenna;
the overcurrent detection module is arranged between the power supply circuit and the input end of the power switch module;
the first input end of the state feedback module is connected with the signal output end of the overcurrent detection module, the second input end of the state feedback module is connected with an external controller, the feedback end of the state feedback module is connected with the signal input end of the controller, and the output end of the state feedback module is connected with the control end of the power switch module.
Preferably, the power switching module includes:
a base electrode of the first switching triode is connected to the control end of the power switch module, and an emitting electrode of the first switching triode is grounded;
a base electrode of the second switching triode is connected with a collector electrode of the first switching triode, the collector electrode of the second switching triode is connected to the power receiving end of the antenna, and an emitting electrode of the second switching triode is connected to the overcurrent detection module;
preferably, the base of the second switching transistor is further connected to the power supply circuit through a first resistor;
and the base electrode of the second switching triode is connected with the collector electrode of the first switching triode through a pair of second resistor and third resistor which are connected in parallel.
Preferably, the base of the first switching triode is connected with the control end of the power switch module through a fourth resistor;
and the base electrode and the emitting electrode of the first switching triode are connected through a fifth resistor.
Preferably, the over-current detection module includes:
one end of the overcurrent detection resistor is connected with the power supply circuit, and the other end of the overcurrent detection resistor is connected with the input end of the power switch module;
the voltage division resistor and the overcurrent detection resistor are connected in parallel between the power supply circuit and the input end of the power switch module;
the overcurrent detection triode is characterized in that an emitting electrode of the overcurrent detection triode is connected with the power supply circuit, a base electrode of the overcurrent detection triode is connected with an input end of the power switch module, and a collector electrode of the overcurrent detection triode is connected to a signal output end of the overcurrent detection module.
Preferably, the state feedback module comprises:
a base of the state feedback triode is connected to a first input end of the state feedback module through a sixth resistor;
the collector of the state feedback triode is connected to the second input end of the state feedback module through a seventh resistor;
the collector of the state feedback triode is also connected to the feedback end and the output end of the state feedback module;
and the emitter of the state feedback triode is grounded.
Preferably, the state feedback module further comprises:
one end of the first capacitor is connected to the output end of the state feedback module, and the other end of the first capacitor is grounded;
and one end of the eighth resistor is connected with the base electrode of the state feedback triode, and the other end of the eighth resistor is connected with the emitting electrode of the state feedback triode.
Preferably, the overcurrent protection circuit further includes:
one end of the second capacitor is connected with the output end of the power switch module, and the other end of the second capacitor is grounded;
one end of the third capacitor is connected with the output end of the power switch module, and the other end of the third capacitor is grounded;
one end of the ninth resistor is connected with the output end of the power switch module;
and the anode of the diode is connected with the other end of the ninth resistor, and the cathode of the diode is connected with the power receiving end of the antenna.
The technical scheme has the following advantages or beneficial effects: the whole circuit adopts a hardware circuit to realize overcurrent detection, state feedback and switch-on and switch-off, has high control efficiency and better stability, and effectively avoids the antenna from being burnt down due to overcurrent faults. Meanwhile, the state feedback end is arranged to feed back an overcurrent signal to the vehicle networking controller, and effective closed-loop control between the vehicle networking controller and the power supply is facilitated.
Drawings
Embodiments of the present invention will now be described more fully hereinafter with reference to the accompanying drawings. The drawings are, however, to be regarded as illustrative and explanatory only and are not restrictive of the scope of the invention.
Fig. 1 is an overall schematic diagram of an embodiment of the present invention;
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
The utility model discloses a:
an overcurrent protection circuit of an antenna, as shown in fig. 1, includes:
the input end of the power switch module 3 is connected to an external power supply circuit BATT, and the output end of the power switch module 3 is connected to the receiving end PANT of the antenna;
the overcurrent detection module 1 is arranged between the power supply circuit BATT and the input end of the power switch module 3;
a first input end of the state feedback module 2 is connected with a signal output end of the overcurrent detection module 1, a second input end of the state feedback module 2 is connected with a control end PANT _ CONT of an external controller, a feedback end of the state feedback module 2 is connected with a signal input end PANT _ ERR of the controller, and an output end of the state feedback module 2 is connected with a control end of the power switch module 3.
Specifically, the utility model is suitable for a car networking equipment. In the actual use process, the overcurrent protection circuit is arranged between the power supply circuit BATT and the power receiving end PANT of the active antenna, whether overcurrent faults exist or not is judged through detecting the current, and then the control circuit is switched on and off, so that the overcurrent protection function is realized, and the active antenna is prevented from being burnt due to overlarge input current. Furthermore, the utility model discloses still realize the state feedback to vehicle-mounted controller through the state feedback module, the controller of being convenient for judges power supply circuit's state according to feedback signal.
In a preferred embodiment, the power switch module 3 comprises:
a first switching transistor Q3, wherein the base of the first switching transistor Q3 is connected to the control end of the power switch module 3, and the emitter of the first switching transistor Q3 is grounded;
a base electrode of a second switching triode Q4 and a base electrode of a second switching triode Q4 are connected with a collector electrode of the first switching triode Q3, a collector electrode of the second switching triode Q4 is connected to a power receiving end PANT of the antenna, and an emitting electrode of a second switching triode Q4 is connected to the over-current detection module 1;
in a preferred embodiment, the base of the second switching transistor Q4 is further connected to the power supply circuit BATT through a first resistor R2;
the base of the second switching transistor Q4 is connected to the collector of the first switching transistor Q3 through a pair of parallel connected second R9 and third R10 resistors.
In a preferred embodiment, the base of the first switching transistor Q3 is connected to the control terminal of the power switch module 3 through a fourth resistor R7;
the base and emitter of the first switching transistor Q3 are connected through a fifth resistor R8.
In a preferred embodiment, the over-current detection module 1 comprises:
one end of an over-current detection resistor R4 is connected with the power supply circuit BATT, and the other end of the over-current detection resistor R4 is connected with the input end of the power switch module 3;
the voltage-dividing resistor R3, the voltage-dividing resistor R3 and the over-current detection resistor R4 are connected in parallel between the power supply circuit BATT and the input end of the power switch module 3;
an emitting electrode of the over-current detection triode Q1, an over-current detection triode Q1 are connected with the power supply circuit BATT, a base electrode of the over-current detection triode Q1 is connected with an input end of the power switch module 3, and a collector electrode of the over-current detection triode Q1 is connected to a signal output end of the over-current detection module 1.
In a preferred embodiment, the state feedback module 2 comprises:
a state feedback transistor Q2, wherein the base of the state feedback transistor Q2 is connected to the first input end of the state feedback module 2 through a sixth resistor R5;
the collector of the state feedback transistor Q2 is connected to the second input terminal of the state feedback module 2 through a seventh resistor R1;
the collector of the state feedback transistor Q2 is also connected to the feedback end and the output end of the state feedback module 2;
the emitter of the state feedback transistor Q2 is grounded.
In a preferred embodiment, the state feedback module 2 further comprises:
one end of a first capacitor C1 is connected to the output end of the state feedback module 2, and the other end of the first capacitor C1 is grounded;
one end of the eighth resistor R6, the eighth resistor R6 is connected with the base of the state feedback transistor Q2, and the other end of the eighth resistor R6 is connected with the emitter of the state feedback transistor Q2.
In a preferred embodiment, the over-current protection circuit further comprises:
one end of a second capacitor C2 is connected with the output end of the power switch module 3, and the other end of the second capacitor C2 is grounded;
one end of a third capacitor C3 and one end of a third capacitor C3 are connected with the output end of the power switch module 3, and the other end of the third capacitor C3 is grounded;
one end of a ninth resistor R11, wherein one end of the ninth resistor R11 is connected with the output end of the power switch module 3;
the anode of the diode D1 is connected to the other end of the ninth resistor R11, and the cathode of the diode D1 is connected to the power receiving terminal PANT of the antenna, of the diode D1.
Specifically, in a preferred embodiment, when the power supply circuit normally operates, the controller outputs a high level signal through the control terminal PANT _ CONT, so that the first switching transistor Q3 is turned on, the collector voltage and the emitter voltage of the first transistor Q3 both become 0V, the base voltage of the second switching transistor Q4 is further made to be 0V, the emitter and the collector of the second switching transistor Q4 are turned on, and the current output by the output terminal BATT of the power supply circuit is output to the power receiving terminal PANT of the antenna through the overcurrent detection resistor, the second switching transistor Q4, the ninth resistor R11, and the diode D1.
Further, when the output voltage of the power supply circuit is normal, the over-current detection transistor Q1 is turned off, so that the base voltage of the state feedback transistor Q2 is 0V, the state feedback transistor Q2 is turned off, and the feedback end of the state feedback module 2 outputs a high level signal to the signal input end PANT _ ERR of the controller, indicating that the current power supply circuit is working normally.
Further, when the power supply circuit has an overcurrent fault, that is, the current on the overcurrent detection resistor R4 is greater than a preset overcurrent limit value, if 545mA is detected, the conduction condition of the base and collector of the overcurrent detection triode Q1 is triggered, the overcurrent detection triode Q1 outputs a high level to the base of the state feedback triode Q2 through the collector, so that the state feedback triode Q2 is conducted, the base voltage of the first switching triode Q3 is reduced to a low level, the second switching triode Q4 is disconnected, the circuit enters an overcurrent protection state, meanwhile, the feedback end of the state feedback module 2 also becomes a low level, and the controller obtains an overcurrent fault signal by detecting the low level of the inverted signal input terminal PANT _ ERR.
Further, after the overcurrent fault is ended, the overcurrent detection triode Q1 is automatically switched off, so that the state feedback triode Q2 is switched off, the first switching triode Q3 is switched on, and the feedback end of the state feedback module 2 becomes a high level, so that the controller judges that the overcurrent fault is ended.
The beneficial effects of the utility model reside in that: the whole circuit adopts a hardware circuit to realize overcurrent detection, state feedback and switch-on and switch-off, has high control efficiency and better stability, and effectively avoids the antenna from being burnt down due to overcurrent faults. Meanwhile, the state feedback end is arranged to feed back an overcurrent signal to the vehicle networking controller, and effective closed-loop control between the vehicle networking controller and the power supply is facilitated.
The above is only a preferred embodiment of the present invention, and not intended to limit the scope of the invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious changes made from the description and drawings should be included within the scope of the present invention.
Claims (8)
1. An overcurrent protection circuit of an antenna, comprising:
the input end of the power switch module is connected to an external power supply circuit, and the output end of the power switch module is connected to the power receiving end of the antenna;
the overcurrent detection module is arranged between the power supply circuit and the input end of the power switch module;
the first input end of the state feedback module is connected with the signal output end of the overcurrent detection module, the second input end of the state feedback module is connected with the control end of an external controller, the feedback end of the state feedback module is connected with the signal input end of the controller, and the output end of the state feedback module is connected with the control end of the power switch module.
2. The antenna overcurrent protection circuit of claim 1, wherein the power switch module comprises:
a base electrode of the first switching triode is connected to the control end of the power switch module, and an emitting electrode of the first switching triode is grounded;
and the base electrode of the second switching triode is connected with the collector electrode of the first switching triode, the collector electrode of the second switching triode is connected to the power receiving end of the antenna, and the emitting electrode of the second switching triode is connected to the overcurrent detection module.
3. The antenna overcurrent protection circuit of claim 2, wherein the base of the second switching transistor is further connected to the power supply circuit through a first resistor;
the base electrode of the second switching triode is connected with the collector electrode of the first switching triode through a pair of second resistor and third resistor which are connected in parallel.
4. The overcurrent protection circuit of claim 2, wherein a base of the first switching transistor is connected to the control terminal of the power switch module via a fourth resistor;
and the base electrode and the emitting electrode of the first switching triode are connected through a fifth resistor.
5. The antenna overcurrent protection circuit of claim 1, wherein the overcurrent detection module comprises:
one end of the overcurrent detection resistor is connected with the power supply circuit, and the other end of the overcurrent detection resistor is connected with the input end of the power switch module;
the voltage division resistor and the overcurrent detection resistor are connected in parallel between the power supply circuit and the input end of the power switch module;
the overcurrent detection triode is characterized in that an emitting electrode of the overcurrent detection triode is connected with the power supply circuit, a base electrode of the overcurrent detection triode is connected with an input end of the power switch module, and a collector electrode of the overcurrent detection triode is connected to a signal output end of the overcurrent detection module.
6. The over-current protection circuit of claim 1, wherein the status feedback module comprises:
the base electrode of the state feedback triode is connected to the first input end of the state feedback module through a sixth resistor;
the collector of the state feedback triode is connected to the second input end of the state feedback module through a seventh resistor;
the collector of the state feedback triode is also connected to the feedback end and the output end of the state feedback module;
and the emitter of the state feedback triode is grounded.
7. The over-current protection circuit for antenna of claim 6, wherein the status feedback module further comprises:
one end of the first capacitor is connected to the output end of the state feedback module, and the other end of the first capacitor is grounded;
and one end of the eighth resistor is connected with the base electrode of the state feedback triode, and the other end of the eighth resistor is connected with the emitting electrode of the state feedback triode.
8. The over-current protection circuit for an antenna of claim 1, further comprising:
one end of the second capacitor is connected with the output end of the power switch module, and the other end of the second capacitor is grounded;
one end of the third capacitor is connected with the output end of the power switch module, and the other end of the third capacitor is grounded;
one end of the ninth resistor is connected with the output end of the power switch module;
and the anode of the diode is connected with the other end of the ninth resistor, and the cathode of the diode is connected with the power receiving end of the antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122578297.8U CN217486162U (en) | 2021-10-25 | 2021-10-25 | Overcurrent protection circuit of antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122578297.8U CN217486162U (en) | 2021-10-25 | 2021-10-25 | Overcurrent protection circuit of antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217486162U true CN217486162U (en) | 2022-09-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122578297.8U Active CN217486162U (en) | 2021-10-25 | 2021-10-25 | Overcurrent protection circuit of antenna |
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|---|---|
| CN (1) | CN217486162U (en) |
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- 2021-10-25 CN CN202122578297.8U patent/CN217486162U/en active Active
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