CN102445590A - Current detection circuit used for judging state of an antenna - Google Patents
Current detection circuit used for judging state of an antenna Download PDFInfo
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- CN102445590A CN102445590A CN2011104338070A CN201110433807A CN102445590A CN 102445590 A CN102445590 A CN 102445590A CN 2011104338070 A CN2011104338070 A CN 2011104338070A CN 201110433807 A CN201110433807 A CN 201110433807A CN 102445590 A CN102445590 A CN 102445590A
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Abstract
The invention relates to a current detection circuit used for judging the state of an antenna, and the current detection circuit comprises the antenna and a precision resistor which are mutually connected in series, wherein the two ends of the precision resistor are connected in parallel with a differential amplification circuit; and an output end of the differential amplification circuit is connected with an analog-digital converter. The current detection circuit has the advantages that through arranging the differential amplification circuit, voltages of the two ends of the precision resistor are detected, and thereby a current flowing through the antenna is detected; and the working condition of the antenna is judged according to the current of the antenna.
Description
Technical field
The present invention relates to a kind of current detection circuit, particularly relate to a kind of current detection circuit that is used to judge antenna condition.
Background technology
Antenna is a kind of transducer, and it is transformed into the electromagnetic wave of in unbounded media (normally free space), propagating to the guided wave of transmission above-the-line promotion, perhaps carries out opposite conversion.In wireless device, be used for emission or receive electromagnetic parts.Engineering systems such as wireless communication, broadcasting, TV, radar, navigation, electronic countermeasure, remote sensing, radio astronomy, every electromagnetic wave that utilizes transmits information, all relies on antenna to carry out work.In addition, aspect electromagnetic wave transmission energy, the energy emission of non-signal also needs antenna.General antenna all has reversibility, promptly both can be used as emitting antenna with common antenna, also can be used as receiving antenna.The same antenna is identical as the fundamental characteristics parameter of emission or reception.
Whether insert in order to detect antenna, in wireless device, be provided with proprietary antenna detection circuit.This type circuit is defined by in design usually can only detect two states: first state can be thought high level state; This moment, antenna was not connected with wireless device; Second state then can be thought low level state, and this moment, external antenna was connected with wireless device.But along with the development of technology, such antenna detection circuit function is simple, can not satisfy market to the multi-functional needs of antenna detection circuit.
Summary of the invention
Technical matters to be solved by this invention provides a kind of current detection circuit that is used to judge antenna condition, can judge the antenna duty.
The technical solution adopted for the present invention to solve the technical problems is: a kind of current detection circuit that is used to judge antenna condition is provided, comprises the antenna and the precision resistance of mutual series connection, said precision resistance two ends are parallel with differential amplifier circuit; The output terminal of said differential amplifier circuit links to each other with analog to digital converter.
Said differential amplifier circuit comprises first triode and second triode; The base stage of said first triode and second triode links to each other; One end of said precision resistance links to each other with the emitter of said first triode through two resistance, and the other end links to each other with the emitter of second triode through a resistance; The base stage of said first triode is also joined with the collector of first triode; The collector of said first triode is through a resistance eutral grounding, and the collector of said second triode is through a resistance eutral grounding; The collector of said second triode also links to each other with described analog to digital converter through a protective resistance, and the two ends of this protective resistance are respectively respectively through a resistance eutral grounding.
Described first triode and second triode are the positive-negative-positive triode.
Said current detection circuit comprises also and fuse that said fuse is connected with said precision resistance.
Beneficial effect
Owing to adopted above-mentioned technical scheme; The present invention compared with prior art; Have following advantage and good effect: the present invention is through a differential amplifier circuit; Realize detecting the voltage at precision resistance two ends, thereby detect the electric current that flows through antenna, and realize judging the antenna duty according to the electric current of antenna.The present invention can accurately judge normal, open circuit and these three kinds of states of short circuit of antenna.
Description of drawings
Fig. 1 is a circuit diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used to the present invention is described and be not used in the restriction scope of the present invention.Should be understood that in addition those skilled in the art can do various changes or modification to the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.
The present invention relates to a kind of current detection circuit that is used to judge antenna condition, as shown in Figure 1, comprise the antenna F1 and the precision resistance R1 of mutual series connection, said precision resistance R1 two ends are parallel with differential amplifier circuit; The output terminal of said differential amplifier circuit links to each other with analog to digital converter.Wherein, said differential amplifier circuit comprises the first triode Q1 and the second triode Q2; The base stage of the said first triode Q1 and the second triode Q2 links to each other; The end of said precision resistance R1 links to each other with the emitter of the said first triode Q1 through two resistance, and the other end links to each other with the emitter of the second triode Q2 through a resistance; The base stage of the said first triode Q1 is also joined with the collector of the first triode Q1; The collector of the said first triode Q1 is through a resistance eutral grounding, and the collector of the said second triode Q2 is through a resistance eutral grounding; The collector of the said second triode Q2 also links to each other with described analog to digital converter through a protective resistance R2, and the two ends of this protective resistance R2 are respectively respectively through a resistance eutral grounding.The first triode Q1 and the second triode Q2 among Fig. 1 are the positive-negative-positive triode.
Pressure drop among the present invention on the precision resistance detects through the differential amplifier circuit that is added in two ends; And the formation simulating signal is exported to analog to digital converter; Calculate the electric current that flows through precision resistance through pressure drop,, thereby can judge the electric current that flows through antenna because antenna and precision resistance are series connection each other; Corresponding relation between antenna current and the antenna duty is: when electric current was 30mA, the expression antenna was in normal duty; When electric current was 0mA, the expression antenna was in the duty of open circuit; When electric current was 500mA, the expression antenna was in the duty of short circuit.State current detection circuit and also comprise and fuse F1, said fuse F1 connects with said precision resistance R1, so can prevent to cause precision resistance to burn because of electric current is excessive.
Be not difficult to find that the present invention realizes detecting the voltage at precision resistance two ends through a differential amplifier circuit, thereby detect the electric current that flows through antenna, and realize accurately judging three kinds of duties of antenna according to the electric current of antenna.
Claims (4)
1. current detection circuit that is used to judge antenna condition comprises the antenna and the precision resistance (R1) of mutual series connection it is characterized in that said precision resistance (R1) two ends are parallel with differential amplifier circuit; The output terminal of said differential amplifier circuit links to each other with analog to digital converter.
2. the current detection circuit that is used to judge antenna condition according to claim 1 is characterized in that, said differential amplifier circuit comprises first triode (Q1) and second triode (Q2); Said first triode (Q1) links to each other with the base stage of second triode (Q2); One end of said precision resistance (R1) links to each other with the emitter of said first triode (Q1) through two resistance, and the other end links to each other with the emitter of second triode (Q2) through a resistance; The base stage of said first triode (Q1) is also joined with the collector of first triode (Q1); The collector of said first triode (Q1) is through a resistance eutral grounding, and the collector of said second triode (Q2) is through a resistance eutral grounding; The collector of said second triode (Q2) also links to each other with described analog to digital converter through a protective resistance (R2), and the two ends of this protective resistance (R2) are respectively respectively through a resistance eutral grounding.
3. the current detection circuit that is used to judge antenna condition according to claim 2 is characterized in that, described first triode (Q1) and second triode (Q2) are the positive-negative-positive triode.
4. the current detection circuit that is used to judge antenna condition according to claim 1 is characterized in that, comprises also and fuse (F1) that said fuse (F1) is connected with said precision resistance (R1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104338070A CN102445590A (en) | 2011-12-21 | 2011-12-21 | Current detection circuit used for judging state of an antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011104338070A CN102445590A (en) | 2011-12-21 | 2011-12-21 | Current detection circuit used for judging state of an antenna |
Publications (1)
| Publication Number | Publication Date |
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| CN102445590A true CN102445590A (en) | 2012-05-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011104338070A Pending CN102445590A (en) | 2011-12-21 | 2011-12-21 | Current detection circuit used for judging state of an antenna |
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| CN (1) | CN102445590A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678159A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Industrial three-phase isolation ampere meter |
| CN104768237A (en) * | 2015-04-22 | 2015-07-08 | 重庆长安汽车股份有限公司 | Device and method for enabling vehicle-mounted terminal to be compatible with active and passive antennas |
| WO2015172306A1 (en) * | 2014-05-12 | 2015-11-19 | 华为技术有限公司 | Antenna cascade relationship recognition method, antenna device and antenna control device |
| CN105988036A (en) * | 2015-03-19 | 2016-10-05 | 精工半导体有限公司 | Current detection circuit |
| CN106932655A (en) * | 2017-03-20 | 2017-07-07 | 北京空间飞行器总体设计部 | A kind of active SAR Antenna Operations state verification system and method for testing |
| CN108226690A (en) * | 2016-12-21 | 2018-06-29 | 国家无线电监测中心检测中心 | Detection circuit |
| CN112505583A (en) * | 2020-11-24 | 2021-03-16 | 深圳市广联智通科技有限公司 | Circuit and method for detecting state of active GPS antenna |
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| CN101408561A (en) * | 2007-10-11 | 2009-04-15 | 中兴通讯股份有限公司 | Circuit for detecting output current and average current of parallel connection power source equipment |
| CN201489075U (en) * | 2009-08-19 | 2010-05-26 | 成都成电亿赛科技股份有限公司 | GPS active antenna on-off detection device |
| JP2011102738A (en) * | 2009-11-10 | 2011-05-26 | Shindengen Electric Mfg Co Ltd | Current detection circuit |
| US20110163734A1 (en) * | 2008-08-29 | 2011-07-07 | Zf Friedrichshafen Ag | Arrangement for measuring at least one value of a voltage applied to an electronic component |
| CN202421281U (en) * | 2011-12-21 | 2012-09-05 | 上海博泰悦臻电子设备制造有限公司 | Current detecting circuit for judging state of antenna |
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2011
- 2011-12-21 CN CN2011104338070A patent/CN102445590A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101408561A (en) * | 2007-10-11 | 2009-04-15 | 中兴通讯股份有限公司 | Circuit for detecting output current and average current of parallel connection power source equipment |
| US20110163734A1 (en) * | 2008-08-29 | 2011-07-07 | Zf Friedrichshafen Ag | Arrangement for measuring at least one value of a voltage applied to an electronic component |
| CN201489075U (en) * | 2009-08-19 | 2010-05-26 | 成都成电亿赛科技股份有限公司 | GPS active antenna on-off detection device |
| JP2011102738A (en) * | 2009-11-10 | 2011-05-26 | Shindengen Electric Mfg Co Ltd | Current detection circuit |
| CN202421281U (en) * | 2011-12-21 | 2012-09-05 | 上海博泰悦臻电子设备制造有限公司 | Current detecting circuit for judging state of antenna |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104678159A (en) * | 2013-11-28 | 2015-06-03 | 哈尔滨市三和佳美科技发展有限公司 | Industrial three-phase isolation ampere meter |
| WO2015172306A1 (en) * | 2014-05-12 | 2015-11-19 | 华为技术有限公司 | Antenna cascade relationship recognition method, antenna device and antenna control device |
| CN105409133A (en) * | 2014-05-12 | 2016-03-16 | 华为技术有限公司 | Antenna cascade relationship recognition method, antenna device and antenna control device |
| CN105409133B (en) * | 2014-05-12 | 2019-05-07 | 华为技术有限公司 | Recognition methods, antenna equipment and the antenna controling equipment of antenna cascade connection |
| CN105988036A (en) * | 2015-03-19 | 2016-10-05 | 精工半导体有限公司 | Current detection circuit |
| CN105988036B (en) * | 2015-03-19 | 2019-09-03 | 艾普凌科有限公司 | Current detection circuit |
| CN104768237A (en) * | 2015-04-22 | 2015-07-08 | 重庆长安汽车股份有限公司 | Device and method for enabling vehicle-mounted terminal to be compatible with active and passive antennas |
| CN104768237B (en) * | 2015-04-22 | 2018-08-14 | 重庆长安汽车股份有限公司 | Car-mounted terminal is compatible with active and passive antenna device and method |
| CN108226690A (en) * | 2016-12-21 | 2018-06-29 | 国家无线电监测中心检测中心 | Detection circuit |
| CN106932655A (en) * | 2017-03-20 | 2017-07-07 | 北京空间飞行器总体设计部 | A kind of active SAR Antenna Operations state verification system and method for testing |
| CN106932655B (en) * | 2017-03-20 | 2019-08-09 | 北京空间飞行器总体设计部 | A kind of active SAR Antenna Operation state verification system and test method |
| CN112505583A (en) * | 2020-11-24 | 2021-03-16 | 深圳市广联智通科技有限公司 | Circuit and method for detecting state of active GPS antenna |
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Application publication date: 20120509 |