CN106374422B - A kind of detection protection circuit based on active antenna - Google Patents

A kind of detection protection circuit based on active antenna Download PDF

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Publication number
CN106374422B
CN106374422B CN201610711807.5A CN201610711807A CN106374422B CN 106374422 B CN106374422 B CN 106374422B CN 201610711807 A CN201610711807 A CN 201610711807A CN 106374422 B CN106374422 B CN 106374422B
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China
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circuit
detection
impedance
short
hysteresis loop
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CN106374422A (en
Inventor
戢汉帮
孙健
葛云峰
徐鹏飞
王伟
肖耀
匡振平
陆剑
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Top Cloud Technology (jiangsu) Co Ltd
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Top Cloud Technology (jiangsu) Co Ltd
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    • 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

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Transmitters (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The invention discloses a kind of detections based on active antenna for the power supply supply for perceiving antenna short circuit and open circuit and can cutting off active antenna in short circuit to protect circuit, including：Working power, controllable electronic switch and its driving circuit, impedance matching network, impedance isolation circuit, low-pass filter, the short-circuit hysteresis loop comparator of detection, the breaking hysteresis loop comparator of detection, short-circuit reference power source and breaking reference power source, the input terminal of the controllable electronic switch is connected with working power, the output end of controllable electronic switch is connected with antenna, the control terminal of controllable electronic switch is connected with the output end of its driving circuit, and the input terminal of the driving circuit of controllable electronic switch is connected with the output end of the short-circuit hysteresis loop comparator of detection.The detection protection circuit based on active antenna is mainly used for being equipped in the wireless localization apparatus such as GPS, the Big Dipper of external active antenna.

Description

A kind of detection protection circuit based on active antenna
Technical field
The present invention relates to the protections being detected to antenna in wireless communication field more particularly to wireless communication field Circuit.
Background technology
Currently, will install GPS positioning device in many mobile vehicles such as car carries out car networking, realize to vehicle Positioning and track following.In actual use, since GPS positioning device is chronically at vibrations, high/low-temperature impact, electromagnetism In the adverse circumstances such as interference, it often will appear antenna connection and loosen disconnection, because of moist short circuit, cause GPS positioning device that can not connect Satellite-signal is received, GPS positioning device is caused to can not work normally (positioning)；Moreover, because GPS positioning device is usually all installed External active antenna, there are the possibility of antenna short circuit, once antenna short circuit, can drag down current potential or even damage entire power-supply system, Cause GPS module and entire terminal device permanent damage.
Invention content
The technical problem to be solved by the present invention is to：Offer one kind can perceive antenna short circuit and open circuit and can be in short circuit Circuit is protected in the detection based on active antenna for cutting off the power supply supply of active antenna.
In order to solve the above technical problems, the technical solution adopted by the present invention is：Circuit is protected in detection based on active antenna, Its structure includes：Working power, controllable electronic switch and its driving circuit, impedance matching network, impedance isolation circuit, low pass filtered Wave device, detection short circuit hysteresis loop comparator detect open circuit hysteresis loop comparator and are matched with hysteresis loop comparator with detection short circuit The short-circuit reference power source of conjunction and with detection open circuit hysteresis loop comparator it is matched open circuit reference power source, impedance matching network it is defeated Enter end with antenna to be connected, the output end of impedance matching network is connected with the input terminal of impedance isolation circuit, impedance isolation circuit Output end is connected with the input terminal of low-pass filter, output end and the short-circuit hysteresis loop comparator of detection, the detection of low-pass filter The signal input part of open circuit hysteresis loop comparator is connected, the reference of short-circuit reference power source and the detection short circuit hysteresis loop comparator Input terminal is connected, and breaking reference power source is connected with the reference input of the breaking hysteresis loop comparator of the detection, detects short circuit and uses The output end of hysteresis loop comparator and detection open circuit hysteresis loop comparator protects electricity respectively as the detection based on active antenna The short-circuit detection signal and open circuit detection signal output, the input terminal of the controllable electronic switch on road are connected with working power, The output end of controllable electronic switch is connected with antenna, and the control terminal of controllable electronic switch is connected with the output end of its driving circuit, The input terminal of the driving circuit of controllable electronic switch is connected with the output end of the short-circuit hysteresis loop comparator of detection.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the low-pass filtering Device is double rank low-pass filters, transmission functionWherein：A is gain, and Q is quality factor, WC For cutoff frequency.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the low-pass filtering Device is double rank RC low-pass filters, wherein A=1, Q=0.5.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the low-pass filtering Device uses low-pass filter of the present invention.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the positioning device String is equipped with static release protection circuit in the outlet line of antenna, and the impedance matching network is connected to electrostatic discharge protection electricity The rear end on road.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the controlled electron It is provided with filter inductance between switch and static release protection circuit.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the controlled electron Switch is metal-oxide-semiconductor.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the detection short circuit is used The 8% of the output voltage of the hysteresis voltage of hysteresis loop comparator >=working power, the detection open circuit hysteresis loop comparator The 3% of the output voltage of hysteresis voltage >=working power；The output voltage of the open circuit reference power source is work electricity The 95% of the output voltage in source, the output voltage of the short circuit reference power source are the 50% of the output voltage of the working power.
As a preferred embodiment, described in the detection protection circuit based on active antenna, the impedance matching The impedance Z of network=∑ (ZDistribution+ZInput+Z0), wherein：ZDistributionFor distributed parasitic impedance, ZInputFor the input of 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 beneficial effects of the invention are as follows：The present invention is by impedance matching network and impedance isolation circuit by wireless localization apparatus Radiofrequency signal and detection signal isolation by low-pass filter, the dc component detected in signal is then introduced to detection 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 Compared with when detecting the dc component in signal and being higher than breaking reference power source, then break signal being exported, when less than short-circuit reference power source When, then while output short-circuit signal, turn off the power supply of active antenna so that mutually powered-down in the positioning devices such as GPS, Big Dipper Road module has obtained protecting well.Further, since the present invention achieves the transmission function of the low-pass filter, to significantly The design cycle for shortening the low-pass filter, design efficiency is improved, saves human cost；In addition, as a result of stagnant Comparator is returned, hysteresis comparison window is provided with, to reduce the influence of burst burr, increases the reliability of entire circuit.
Description of the drawings
Fig. 1 is the electric principle knot schematic diagram of the detection protection circuit of the present invention based on active antenna.
Reference numeral in figure：1, working power, 2, controllable electronic switch, 3, driving circuit, 4, impedance matching network, 5, Impedance isolation circuit, 6, low-pass filtering, 7, detection short circuit hysteresis loop comparator, 8, detect 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 implementation mode
Below in conjunction with the accompanying drawings, a kind of the specific of detection protection circuit based on active antenna of the present invention is described in detail Embodiment：
As shown in Figure 1, circuit is protected in the detection of the present invention based on active antenna, including：Output voltage is 3.3V Working power 1, the metal-oxide-semiconductor as controllable electronic switch 2 and its driving circuit 3, impedance matching network 4, impedance isolation circuit 5, low-pass filter 6, the short-circuit hysteresis loop comparator 7 of detection, the breaking hysteresis loop comparator 8 of detection and with detection short circuit hysteresis The matched short-circuit reference power source 9 of comparator 7 and with the detection open circuit matched breaking reference power source 10 of hysteresis loop comparator 8, Static release protection circuit 11 and filter inductance L, the string of static release protection circuit 11 are located at antenna and are connected to the nothings such as GPS module On the circuit of the correlation module of line positioning device, input terminal and the static release protection circuit 11 of the impedance matching network 4 Output end be connected, the output end of impedance matching network 4 is connected with the input terminal of impedance isolation circuit 5, impedance isolation circuit 5 it is defeated Outlet is connected with the input terminal of low-pass filter 6, and the output end of low-pass filter 6 uses the letter of hysteresis loop comparator 7 with detection short circuit Number input terminal is connected with detection open circuit with the signal input part of hysteresis loop comparator 8, the output end of short-circuit reference power source 9 and the inspection The reference input for surveying short circuit hysteresis loop comparator 7 is connected, and the output end of breaking reference power source 10 is breaking with stagnant with the detection The reference input for returning comparator 8 is connected, and detection short circuit use the output end of hysteresis loop comparator 7 described in based on active antenna The short-circuit detection signal output for protecting circuit is detected, it is active that detection open circuit uses the output end of hysteresis loop comparator 8 to be based on described in The open circuit detection signal output of the detection protection circuit of antenna, input terminal and the working power 1 of the controllable electronic switch 2 Output end is connected, the output that the output end of controllable electronic switch 2 passes through the filter inductance L and static release protection circuit 11 End is connected, and the control terminal of controllable electronic switch 2 is connected with the output end of the driving circuit 3 of controllable electronic switch 2, and controlled electron is opened The input terminal for closing 2 driving circuit 3 is connected with detection short circuit with the output end of hysteresis loop comparator 7.In the present embodiment, described Low-pass filter 6 uses a kind of double rank RC low-pass filters, transmission functionWherein：WCFor Cutoff frequency, A are gain, and Q is quality factor, when actual design, are usually enabled：A=1, Q=0.5, by adjusting parameter so that WC=1KHz ± 10Hz；The impedance Z of the impedance matching network 4=∑ (ZDistribution+ZInput+Z0), wherein：ZDistributionFor distributed parasitic Impedance, ZInputFor the input impedance of impedance isolation circuit, Z0For the impedance of capacitance-resistance matching network, by adjusting capacitance-resistance matching network Impedance Z0So that the Ω of the impedance Z of impedance matching network=50；The hysteresis voltage of the detection short circuit hysteresis loop comparator 7 >= The 8% of the output voltage of the working power 1, usually 0.3 volt, detection open circuit with the hysteresis voltage of hysteresis loop comparator 8 >= The 3% of the output voltage of the working power 1, usually 0.1 volt, the output voltage of the open circuit reference power source 10 is the work Make the 95% of the output voltage of power supply 1, the output voltage of the short circuit reference power source 9 is the output voltage of the working power 1 50%.
When practical application, described takes the laminated inductance that resonant frequency is about 1.4G, by the radiofrequency signal and work on GPS The noise made on the output voltage VDD of power supply 1 separates, to reduce the interference to GPS signal；The impedance isolation circuit 5 is adopted With the radio frequency amplifier of low input parasitic parameter, high input impedance, the modulate circuit of the signal and rear end that make GPS realize every From preventing the processing circuit of rear end from generating interference to GPS signal, influence identification of the GPS module to the signal received.
The operation principle of the present invention is that：It is 50 Ω impedances by characteristic impedance according to the signal characteristic of active GPS antenna Distribution network 4 and impedance isolation circuit 5, GPS signal is introduced in low-pass filter 6, high-frequency signal is filtered out, takes low-frequency d Signal is sent 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 antenna signal is VDD, increases 0.1V Hysteresis space, i.e.,：It after open circuit occurs, is 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, to increase the promptness of protection, when aerial signal is less than 0.5*VDD, then in output short-circuit While signal, drives electronically controlled switch 2 to turn off power supply of the working power 1 to GPS antenna by driver 3, play timely guarantor The effect of protecting system.Comparator output bounce in order to prevent, increases the hysteresis space of 0.3V, to increase the reliability of detection
In conclusion only presently preferred embodiments of the present invention, is not used for limiting the scope of implementation of the present invention, it is all according to Equivalent changes and modifications made by shape, construction, feature and spirit described in scope of the invention as claimed should all be included in this In the right of invention.

Claims (5)

1. circuit is protected in a kind of detection based on active antenna, including：Working power, it is characterised in that：It is described based on active The detection protection circuit of antenna further includes having：Controllable electronic switch and its driving circuit, impedance matching network, impedance isolation electricity Road, low-pass filter, the short-circuit hysteresis loop comparator of detection, detection open circuit hysteresis loop comparator and with detect short circuit hysteresis ratio It is matched compared with device short circuit reference power source and with detection open circuit hysteresis loop comparator it is matched open circuit reference power source, impedance matching The input terminal of network is connected with antenna, and the output end of impedance matching network is connected with the input terminal of impedance isolation circuit, impedance every Output end from circuit is connected with the input terminal of low-pass filter, and the output end of low-pass filter is compared with detecting short circuit hysteresis Device, the signal input part for detecting open circuit hysteresis loop comparator are connected, and short-circuit reference power source is compared with the detection short circuit hysteresis The reference input of device is connected, and breaking reference power source is connected with the reference input of the breaking hysteresis loop comparator of the detection, examines It surveys short circuit hysteresis loop comparator and detects the output end of open circuit hysteresis loop comparator respectively as the inspection based on active antenna Survey short-circuit detection signal and the open circuit detection signal output of protection circuit, input terminal and the work electricity of the controllable electronic switch Source is connected, and the output end of controllable electronic switch is connected with antenna, the control terminal of controllable electronic switch and the output of its driving circuit End is connected, and the input terminal of the driving circuit of controllable electronic switch is connected with the output end of the short-circuit hysteresis loop comparator of detection；It is described Impedance matching network impedance Z=∑ (ZDistribution+ZInput+Z0), wherein：ZDistributionFor distributed parasitic impedance, ZInputIt is isolated for impedance The input impedance of circuit, Z0For the impedance of capacitance-resistance matching network, by adjusting the impedance of capacitance-resistance matching network so that impedance matching The Ω of the impedance Z of network=50.
2. circuit is protected in the detection according to claim 1 based on active antenna, it is characterised in that：The low-pass filtering Device is double rank low-pass filters, transmission functionWherein：A is gain, and Q is quality factor, WC For cutoff frequency.
3. circuit is protected in the detection according to claim 2 based on active antenna, it is characterised in that：The low-pass filtering Device is double rank RC low-pass filters, wherein A=1, Q=0.5.
4. circuit is protected in the detection according to claim 1 based on active antenna, it is characterised in that：The controlled electron Switch is metal-oxide-semiconductor.
5. circuit is protected in the detection based on active antenna according to one of Claims 1-4, it is characterised in that：The inspection Survey the 8% of the output voltage of hysteresis voltage >=working power of short circuit hysteresis loop comparator, the detection open circuit hysteresis The 3% of the output voltage of the hysteresis voltage of comparator >=working power；The output voltage of the open circuit reference power source is institute The 95% of the output voltage of working power is stated, the output voltage of the short circuit reference power source is the output voltage of the working power 50%.
CN201610711807.5A 2016-08-24 2016-08-24 A kind of detection protection circuit based on active antenna Active CN106374422B (en)

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CN111381109B (en) 2018-12-27 2022-07-08 启碁科技股份有限公司 Electronic device
TWI679430B (en) * 2019-01-04 2019-12-11 啓碁科技股份有限公司 Electronic device
CN111815880B (en) * 2020-08-07 2021-04-06 成都惠之慧安全科技有限公司 Electric fire and gas intelligent monitoring alarm system
CN112367127B (en) * 2020-10-26 2023-01-24 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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CN100568785C (en) * 2004-08-31 2009-12-09 中兴通讯股份有限公司 A kind of method and apparatus that detects antenna and feeder line connection status
CN202309017U (en) * 2011-11-16 2012-07-04 成都芯通科技股份有限公司 Overcurrent protection system for GPS (Global Positioning System) active antenna
CN102540208A (en) * 2011-12-21 2012-07-04 东莞市泰斗微电子科技有限公司 Antenna short-circuit detection and protection device of satellite navigation receiver
CN103178483B (en) * 2011-12-21 2017-12-22 北京普源精电科技有限公司 A kind of radio-frequency signal source and reverse protection method with reverse protection function
CN104714116A (en) * 2013-12-12 2015-06-17 上海博泰悦臻网络技术服务有限公司 Antenna detection circuit
CN104483590B (en) * 2014-12-24 2017-06-13 天津七六四通信导航技术有限公司 Satellite navigation aerial status determination circuit and its implementation

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