CN106374422A - Active antenna-based detection protection circuit - Google Patents
Active antenna-based detection protection circuit Download PDFInfo
- Publication number
- CN106374422A CN106374422A CN201610711807.5A CN201610711807A CN106374422A CN 106374422 A CN106374422 A CN 106374422A CN 201610711807 A CN201610711807 A CN 201610711807A CN 106374422 A CN106374422 A CN 106374422A
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- China
- Prior art keywords
- circuit
- impedance
- detection
- input
- short
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/10—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current additionally responsive to some other abnormal electrical conditions
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses an active antenna-based detection protection circuit capable of sensing a short-circuit state and an open-circuit state of the antenna, and switching off power supply of the active antenna in the short-circuit condition. The active antenna-based detection protection circuit comprises a working power supply, a controllable electronic switch and a driving circuit thereof, an impedance matching network, an impedance isolating circuit, a low-pass filter, a short-circuit detection hysteresis comparator, an open-circuit-detection hysteresis comparator, a short-circuit reference power supply and an open-circuit reference power supply, wherein the input end of the controllable electronic switch is connected with the working power supply while the output end of the controllable electronic switch is connected with the antenna; the control end of the controllable electronic switch is connected with the output end of the driving circuit of the controllable electronic switch; and the input end of the driving circuit of the controllable electronic switch is connected with the output end of the short-circuit detection hysteresis comparator. The active antenna-based detection protection circuit is mainly used in a GPS, a Beidou and other wireless positioning equipment which is equipped with an external active antenna.
Description
Technical field
The present invention relates to the protection in wireless communication field, more particularly, to wireless communication field, antenna being detected
Circuit.
Background technology
At present, a lot of mobile vehicle such as passenger vehicle will install gps location equipment and carry out car networking, realize to vehicle
Positioning and track following.In actual use, because gps location equipment is chronically at vibrations, high/low-temperature impact, electromagnetism
Interference etc. is in adverse circumstances, often occur antenna connect loosen disconnect, because of moist short circuit, cause gps location equipment cannot connect
Receive satellite-signal, lead to the gps location equipment cannot normal work (positioning)；It is additionally, since gps location equipment generally all to install
, there is the possibility of antenna short circuit in external active antenna, once antenna short circuit, can drag down current potential and even damage whole power-supply system,
Cause gps module and whole terminal unit permanent damage.
Content of the invention
The technical problem to be solved is: provide one kind can perceive antenna short circuit and open circuit and can be in short circuit
The detection protection circuit based on active antenna of the power supply supply of cut-out active antenna.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the detection protection circuit based on active antenna,
Its structure includes: working power, controllable electronic switch and its drive circuit, impedance matching network, impedance isolation circuit, low pass filtered
Ripple device, detect short-circuit hysteresis loop comparator, detection open circuit hysteresis loop comparator and with detect short-circuit hysteresis comparison circuit phase
The short-circuit reference power source of cooperation and the breaking reference power source matching with detection open circuit hysteresis comparison circuit, impedance matching network
Input be connected with antenna, the outfan of impedance matching network is connected with the input of impedance isolation circuit, impedance isolation electricity
The outfan on road is connected with the input of low pass filter, the outfan of low pass filter with detect short-circuit hysteresis loop comparator,
The signal input part of detection open circuit hysteresis loop comparator is connected, short-circuit reference power source and described detect short circuit hysteresis loop comparator
Reference input is connected, and breaking reference power source is connected with the reference input of described detection open circuit hysteresis loop comparator, and detection is short
The outfan of road hysteresis loop comparator and detection open circuit hysteresis loop comparator is protected respectively as the described detection based on active antenna
The short-circuit detection signal of protection circuit and breaking detection signal output, the described input of controllable electronic switch and working power phase
Even, the outfan of controllable electronic switch is connected with antenna, the outfan phase of the control end of controllable electronic switch and its drive circuit
Even, the input of the drive circuit of controllable electronic switch is connected with the outfan of detection short circuit hysteresis loop comparator.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described low-pass filtering
Device is double rank low pass filter, its transmission functionWherein: a is gain, q is quality factor, wc
For cut-off frequency.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described low-pass filtering
Device is double rank rc low pass filter, wherein, a=1, q=0.5.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described low-pass filtering
Device employs low pass filter of the present invention.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described location equipment
In the outlet line of antenna, string is provided with static release protection circuit, and described impedance matching network is connected to electrostatic discharge protection electricity
The rear end on road.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described controlled electron
It is provided with filter inductance between switch and static release protection circuit.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described controlled electron
Switch as mos pipe.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described detection short circuit is used
The 8% of the output voltage of the hysteresis voltage of hysteresis loop comparator >=described working power, described detection open circuit hysteresis loop comparator
The 3% of the output voltage of hysteresis voltage >=described working power；The output voltage of described open circuit reference power source is described work electricity
The 95% of the output voltage in source, the output voltage of described short circuit reference power source is the 50% of the output voltage of described working power.
As a kind of preferred version, described based in the detection protection circuit of active antenna, described impedance matching
The impedance z=σ (z of networkDistribution+zInput+z0), wherein: zDistributionFor distributed parasitic impedance, zInputInput for impedance isolation circuit
Impedance, z0For the impedance of capacitance-resistance matching network, by adjusting the impedance of capacitance-resistance matching network so that the impedance of impedance matching network
Z=50 ω.
The invention has the beneficial effects as follows: the present invention passes through impedance matching network and impedance isolation circuit by wireless localization apparatus
Radiofrequency signal and detection signal isolation, then, by low pass filter, the dc component in detection signal is introduced to detect
Open circuit hysteresis loop comparator and detection short circuit hysteresis loop comparator, respectively compared with breaking reference power source and short-circuit reference power source
Relatively, when the dc component in detection signal is higher than breaking reference power source, then export break signal, when less than short-circuit reference power source
When, then while output short-circuit signal, the power supply turning off active antenna is so that mutually powered-down in the location equipment such as gps, Big Dipper
Road module has obtained protecting well.Further, since the present invention achieves the transmission function of described low pass filter, thus significantly
Shorten the design cycle of this low pass filter, improve design efficiency, save human cost；Further, since employing stagnant
Returning comparator, be provided with hysteresis comparison window, thus decreasing the impact of burst burr, increased the reliability of whole circuit.
Brief description
Fig. 1 is the electric principle knot schematic diagram of the detection protection circuit based on active antenna of the present invention.
The reference of in figure: 1, working power, 2, controllable electronic switch, 3, drive circuit, 4, impedance matching network, 5,
Impedance isolation circuit, 6, low-pass filtering, 7, detection short circuit hysteresis loop comparator, 8, detection open circuit hysteresis loop comparator, 9, short circuit
Reference power source, 10, breaking reference power source, 11, static release protection circuit, l, filter inductance.
Specific embodiment
Below in conjunction with the accompanying drawings, describe a kind of the concrete of detection protection circuit based on active antenna of the present invention in detail
Embodiment:
As shown in figure 1, the detection protection circuit based on active antenna of the present invention, comprising: output voltage is 3.3v
Working power 1, as controllable electronic switch 2 mos pipe and its drive circuit 3, impedance matching network 4, impedance isolation circuit
5th, low pass filter 6, detection short circuit hysteresis loop comparator 7, detection open circuit hysteresis loop comparator 8 and with detect short circuit hysteresis
Short-circuit reference power source 9 and the breaking reference power source matching with detection open circuit hysteresis comparison circuit 8 that comparison circuit 7 matches
10th, static release protection circuit 11 and filter inductance l, static release protection circuit 11 string is located at antenna and is connected to such as gps module
On circuit Deng the correlation module of wireless localization apparatus, the input of described impedance matching network 4 and static release protection circuit
11 outfan is connected, and the outfan of impedance matching network 4 is connected with the input of impedance isolation circuit 5, impedance isolation circuit 5
Outfan be connected with the input of low pass filter 6, the outfan of low pass filter 6 with detection short circuit use hysteresis loop comparator 7
Signal input part be connected with the signal input part of detection open circuit hysteresis loop comparator 8, the outfan of short-circuit reference power source 9 and institute
The reference input stating detection short circuit hysteresis loop comparator 7 is connected, and the outfan of breaking reference power source 10 is breaking with described detection
It is connected with the reference input of hysteresis loop comparator 8, the short-circuit outfan with hysteresis loop comparator 7 of detection is as described based on active sky
The short-circuit detection signal output of the detection protection circuit of line, the outfan of detection open circuit hysteresis loop comparator 8 is based on as described
The breaking detection signal output of the detection protection circuit of active antenna, the described input of controllable electronic switch 2 and work electricity
The outfan in source 1 is connected, and the outfan of controllable electronic switch 2 passes through described filter inductance l and static release protection circuit 11
Outfan be connected, the control end of controllable electronic switch 2 is connected with the outfan of the drive circuit 3 of controllable electronic switch 2, controlled
The input of drive circuit 3 of electrical switch 2 is connected with the outfan of detection short circuit hysteresis loop comparator 7.In the present embodiment,
Described low pass filter 6 employs a kind of pair of rank rc low pass filter, its transmission functionIts
In: wcFor cut-off frequency, a is gain, and q is quality factor, during actual design, generally makes: a=1, q=0.5, is joined by adjustment
Number is so that wc=1khz ± 10hz；The impedance z=∑ (z of described impedance matching network 4Distribution+zInput+z0), wherein: zDistributionFor dividing
Cloth spurious impedance, zInputFor the input impedance of impedance isolation circuit, z0For the impedance of capacitance-resistance matching network, by adjusting capacitance-resistance
The impedance z of matching network0So that the impedance z=50 ω of impedance matching network；Described detection short circuit is stagnant with hysteresis loop comparator 7
The 8% of the output voltage of pressure >=described working power 1 of wiring back, usually 0.3 volt, the detection open circuit hysteresis of hysteresis loop comparator 8
Voltage all >=output voltage of described working power 1 3%, usually 0.1 volt, the output voltage of described open circuit reference power source 10
For the 95% of the output voltage of described working power 1, the output voltage of described short circuit reference power source 9 is described working power 1
The 50% of output voltage.
During practical application, described takes the resonant frequency about laminated inductance of 1.4g, by the radiofrequency signal on gps and work
The noise made on the output voltage vdd of power supply 1 separates, to reduce the interference to gps signal；Described impedance isolation circuit 5 is adopted
With the radio frequency amplifier of low input parasitic parameter, high input impedance, make the signal of gps and the modulate circuit of rear end achieve every
From, prevent the process circuit of rear end from gps signal is produced and disturb, the impact identification to the signal receiving for the gps module.
The operation principle of the present invention is: according to the signal characteristic of active gps antenna, is 50 ω impedances by characteristic impedance
Distribution network 4 and impedance isolation circuit 5, gps signal are introduced in low pass filter 6, filter high-frequency signal, take low-frequency d
Signal delivers to the reference input of detection short circuit hysteresis loop comparator 7, detection open circuit hysteresis loop comparator 8 as detection signal,
If gps antenna normally accesses, aerial signal is usually 0.9*vdd, if antenna disconnects, gps aerial signal is vdd, increases 0.1v
Hysteresis space it may be assumed that after there is open circuit, being beated back and forth with preventing from comparing output, to increase the reliability of detection；If gps days
Line short circuit, the signal of antenna is zero, for increasing the promptness of protection, when aerial signal is less than 0.5*vdd, then in output short-circuit
While signal, drive electronically controlled switch 2 to turn off the power supply to gps antenna for the working power 1 by driver 3, play timely guarantor
The effect of protecting system.In order to prevent comparator output from beating, increase the hysteresis space of 0.3v, to increase the reliability of detection
In sum, only presently preferred embodiments of the present invention, is not used for limiting the scope of present invention enforcement, all according to
Impartial change and modification that shape described in scope of the invention as claimed, construction, feature and spirit are made, all should be included at this
In the right of invention.
Claims (9)
1. a kind of detection protection circuit based on active antenna, comprising: working power it is characterised in that: described based on active
The detection protection circuit of antenna also includes: controllable electronic switch and its drive circuit, impedance matching network, impedance isolation electricity
Road, low pass filter, detect short-circuit hysteresis loop comparator, detection open circuit hysteresis loop comparator and short-circuit use hysteresis ratio with detecting
The short-circuit reference power source matching compared with circuit and the breaking reference power source matching with detection open circuit hysteresis comparison circuit, impedance
The input of matching network is connected with antenna, and the outfan of impedance matching network is connected with the input of impedance isolation circuit, resistance
The outfan of anti-isolation circuit is connected with the input of low pass filter, the outfan of low pass filter with detection short circuit hysteresis
Comparator, the signal input part of detection open circuit hysteresis loop comparator are connected, and short-circuit reference power source detects short circuit hysteresis with described
The reference input of comparator is connected, the reference input phase of breaking reference power source and described detection open circuit hysteresis loop comparator
Connect, detect short circuit hysteresis loop comparator with the outfan detecting open circuit hysteresis loop comparator respectively as described based on active antenna
The short-circuit detection signal of detection protection circuit and the output of breaking detection signal, the described input of controllable electronic switch and work
Make power supply to be connected, the outfan of controllable electronic switch is connected with antenna, the control end of controllable electronic switch and its drive circuit
Outfan is connected, and the input of the drive circuit of controllable electronic switch is connected with the outfan of detection short circuit hysteresis loop comparator.
2. the detection protection circuit based on active antenna according to claim 1 it is characterised in that: described low-pass filtering
Device is double rank low pass filter, its transmission functionWherein: a is gain, q is quality factor, wc
For cut-off frequency.
3. low pass filter according to claim 2 it is characterised in that: described low pass filter is double rank rc low pass filtered
Ripple device, wherein, a=1, q=0.5.
4. the detection protection circuit based on active antenna according to claim 1 it is characterised in that: described location equipment
In the outlet line of antenna, string is provided with static release protection circuit, and described impedance matching network is connected to electrostatic discharge protection electricity
The outfan on road.
5. the detection protection circuit based on active antenna according to claim 4 it is characterised in that: described controlled electron
It is provided with filter inductance between switch and static release protection circuit.
6. the detection protection circuit based on active antenna according to claim 1 it is characterised in that: described controlled electron
Switch as mos pipe.
7. the detection protection circuit based on active antenna according to one of claim 1 to 6 it is characterised in that: described inspection
The 8% of the output voltage of hysteresis voltage >=described working power of survey short circuit hysteresis loop comparator, described detection open circuit hysteresis
The 3% of the output voltage of the hysteresis voltage of comparator >=described working power；The output voltage of described open circuit reference power source is institute
State working power output voltage 95%, described short circuit reference power source output voltage be described working power output voltage
50%.
8. the detection protection circuit based on active antenna according to one of claim 1 to 6 it is characterised in that: described
The impedance z=∑ (z of impedance matching networkDistribution+zInput+z0), wherein: zDistributionFor distributed parasitic impedance, zInputIsolate electricity for impedance
The input impedance on road, z0For the impedance of capacitance-resistance matching network, by adjusting the impedance of capacitance-resistance matching network so that impedance matching net
The impedance z=50 ω of network.
9. the detection protection circuit based on active antenna according to claim 7 it is characterised in that: described impedance matching
The impedance z=∑ (z of networkDistribution+zInput+z0), wherein: zDistributionFor distributed parasitic impedance, zInputInput for impedance isolation circuit
Impedance, z0For the impedance of capacitance-resistance matching network, by adjusting the impedance of capacitance-resistance matching network so that the impedance of impedance matching network
Z=50 ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610711807.5A CN106374422B (en) | 2016-08-24 | 2016-08-24 | A kind of detection protection circuit based on active antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610711807.5A CN106374422B (en) | 2016-08-24 | 2016-08-24 | A kind of detection protection circuit based on active antenna |
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| Publication Number | Publication Date |
|---|---|
| CN106374422A true CN106374422A (en) | 2017-02-01 |
| CN106374422B CN106374422B (en) | 2018-10-12 |
Family
ID=57878150
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610711807.5A Active CN106374422B (en) | 2016-08-24 | 2016-08-24 | A kind of detection protection circuit based on active antenna |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI679430B (en) * | 2019-01-04 | 2019-12-11 | 啓碁科技股份有限公司 | Electronic device |
| US10644378B1 (en) | 2018-12-27 | 2020-05-05 | Wistron Neweb Corp. | Electronic device |
| CN111815880A (en) * | 2020-08-07 | 2020-10-23 | 成都惠之慧安全科技有限公司 | Electric fire and gas intelligent monitoring alarm system |
| CN112367127A (en) * | 2020-10-26 | 2021-02-12 | 维沃移动通信有限公司 | Antenna detection circuit, electronic device, and antenna control method |
| CN115060963A (en) * | 2022-08-17 | 2022-09-16 | 天津七六四通信导航技术有限公司 | Circuit for detecting current voltage of radio frequency front end of receiver and implementation method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10644378B1 (en) | 2018-12-27 | 2020-05-05 | Wistron Neweb Corp. | Electronic device |
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| CN115060963A (en) * | 2022-08-17 | 2022-09-16 | 天津七六四通信导航技术有限公司 | Circuit for detecting current voltage of radio frequency front end of receiver and implementation method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106374422B (en) | 2018-10-12 |
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