CN202929137U - Antenna state detection circuit applied to ship automatic identification system terminal - Google Patents
Antenna state detection circuit applied to ship automatic identification system terminal Download PDFInfo
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- CN202929137U CN202929137U CN 201220550512 CN201220550512U CN202929137U CN 202929137 U CN202929137 U CN 202929137U CN 201220550512 CN201220550512 CN 201220550512 CN 201220550512 U CN201220550512 U CN 201220550512U CN 202929137 U CN202929137 U CN 202929137U
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Abstract
The utility model relates to an antenna state detection circuit applied to a ship automatic identification system terminal. The circuit is composed of operational amplifiers U1A and U1B, a coupling inductor L1, inductors L2 and L3, diodes D1 and D2, capacitors C1 to C6 and resistors R1 to R6. The circuit is arranged between a power amplifier in a ship AIS terminal and an antenna. A pin 1 of the operational amplifier U1A and a pin 7 of U1B are connected with analog-to-digital conversion (ADC) IO ports of a microprocessor in the ship AIS terminal. When a signal is transmitted, the ADC is started, and abnormalities of the antenna and the power amplifier are judged according to two ADC results. If abnormalities exist, alarm information is displayed on a liquid crystal display of the ship AIS terminal and a prompt sound is given out to remind staff to promptly take appropriate measures, thus serious security hidden dangers caused by equipment failures caused by problems of the antenna or the power amplifier are eliminated.
Description
Technical field
The utility model relates to a kind of antenna condition testing circuit, relates to specifically a kind of antenna condition testing circuit for ship automatic identification system terminal.
Background technology
Ship automatic identification system (Automatic Identification System, be called for short AIS) be a kind of novel digitizing navaid, integrate modern communication technology, network technology, computer technology and electronic information technology, realize the navaid function of boats and ships all-weather navigation, overcome the limitation of human eye vision.AIS is by on the bank AIS base station, and onboard AIS terminal and AIS navigational aid form, and carries out radio broadcasting and communication by very high frequency(VHF) (VHF) section.The VHF antenna should be contained in when the onboard AIS terminal is installed on the ship top, be connected with AIS terminal in pilothouse by cable.The cable of VHF antenna has several meters long, add outside the vibration of upper hull due to long term exposure, be prone to the problems such as aging, broken line, broken string, antenna terminal loose contact, make normally receiving and transmitting signal of onboard AIS terminal, if fail in time to find, will exist serious potential safety hazard.Therefore be badly in need of the antenna condition testing circuit of a kind of suitable onboard AIS terminal of design.
Summary of the invention
The utility model purpose is to provide a kind of antenna condition testing circuit for ship automatic identification system terminal, has overcome existing onboard AIS terminal antenna extremely and the problem of no alarm prompting.
For achieving the above object, the technical solution of the utility model and measure are:
The antenna condition testing circuit of ship automatic identification system terminal is by operational amplifier U1A, U1B, coupling inductance L1, and inductor L2, L3, diode D1, D2, capacitor C 1～C6, resistance R 1～R6 forms.
Described coupling inductance L1, pin 1 passes the hollow magnetic core with pin 2 by thicker enameled wire; Pin 3 passes the hollow magnetic core around 5～10 circles with pin 4 by thinner enameled wire.Wherein pin 1 is connected with a pin of power amplifier, capacitor C 1; Pin 2 is connected with a pin of antenna, capacitor C 2.
Described diode D1, negative pole is connected with another pin of capacitor C 1, a pin of capacitor C 3, a pin of inductance L 2; Positive pole is connected with the pin 4 of coupling inductance L1, a pin of resistance R 1.
Described diode D2, negative pole is connected with another pin of capacitor C 2, a pin of capacitor C 4, a pin of inductance L 3; Positive pole is connected with the pin 3 of coupling inductance L1, a pin of resistance R 2.
Described operational amplifier U1A, pin 3 is connected with another pin of inductance L 2, a pin of resistance R 4, a pin of capacitor C 6; Pin 2 is connected with the pin of resistance R 5, R8; Pin 1 is connected with another pin of resistance R 8; Pin 8 is connected with power supply VCC, pin 4 ground connection.
Described operational amplifier U1B, pin 5 is connected with another pin of inductance L 3, a pin of resistance R 3, a pin of capacitor C 5; Pin 6 is connected with the pin of resistance R 6, R7; Pin 7 is connected with another pin of resistance R 7.
Another pin ground connection of described resistance R 1, R2, R3, R4.
Another pin ground connection of described capacitor C 3, C4, C5, C6.
When connecting the antenna that mates with power amplifier output impedance, the power of power amplifier output this moment only has the forward transmission, there is no reflective power, the signal of coupling inductance L1 pin 4 outputs is after diode D1 detection, voltage on capacitor C 3 increases, give the in-phase proportion amplifier that is made of operational amplifier U1A, resistance R 5, R8 and amplify after the low-pass filter filtering that inductance L 2, resistance R 4, capacitor C 6 consist of, the voltage of exporting from the pin 1 of operational amplifier U1A at last increases.Owing to there is no reflective power, through the signal of coupling inductance L1 pin 3 output after diode D2 detection, voltage on capacitor C 4 is almost nil, give the in-phase proportion amplifier that consisted of by operational amplifier U1B, resistance R 6, R7 and amplify after the low-pass filter filtering that inductance L 3, resistance R 3, capacitor C 5 consist of, also almost nil from the voltage of pin 7 outputs of operational amplifier U1B at last.
If will there be reflective power in the problems such as that the antenna that connects has is aging, broken line, broken string, antenna terminal loose contact, at last from pin 7 output voltages of operational amplifier U1B with non-vanishing.Therefore, can judge according to the size of pin 7 voltages of 1 pin of operational amplifier U1A and U1B the abnormal conditions of antenna.If the signal in conjunction with the transmission Enable Pin of power amplifier judges again, can also differentiate the abnormal conditions of power amplifier.When the signal of the transmission Enable Pin of power amplifier enabled, pin 7 voltages of the pin 1 of operational amplifier U1A and U1B were zero or less than normal, illustrate that power amplifier has extremely.
The beneficial effects of the utility model are: by simultaneously to the forward power of power amplifier and the detection of reflective power, can realize to realize the detection to the power amplifier abnormal conditions simultaneously to the detection of the problems such as aging, broken line, broken string, antenna terminal loose contact.
Description of drawings
Fig. 1 is the application connection diagram of antenna condition testing circuit described in the utility model.
Fig. 2 be antenna condition testing circuit described in the utility model an embodiment hardware circuit diagram.
Embodiment
Below in conjunction with accompanying drawing, be described in detail concrete structure of the present utility model and embodiment.
In Fig. 1,1 is the onboard AIS terminal, and 2 is the antenna condition testing circuit, and 3 is antenna.The power amplifier output terminal of onboard AIS terminal is connected to the power input end of antenna condition testing circuit; The power take-off of antenna condition testing circuit is connected to antenna; The detection output signal of antenna condition testing circuit is connected on analog to digital conversion (ADC) the IO mouth of onboard AIS terminal.
In Fig. 2, U1A, U1B are operational amplifier, and L1 is coupling inductance, and L2, L3 are inductor, and D1, D2 are diode, and C1～C6 is electric capacity, and R1～R6 is resistance.
In Fig. 2, the pin 1 of coupling inductance L1 is connected with a pin of power amplifier, capacitor C 1; The pin 2 of coupling inductance L1 is connected with a pin of antenna, capacitor C 2.The negative pole of diode D1 is connected with another pin of capacitor C 1, a pin of capacitor C 3, a pin of inductance L 2; The positive pole of diode D1 is connected with the pin 4 of coupling inductance L1, a pin of resistance R 1.The negative pole of diode D2 is connected with another pin of capacitor C 2, a pin of capacitor C 4, a pin of inductance L 3; The positive pole of diode D2 is connected with the pin 3 of coupling inductance L1, a pin of resistance R 2.The pin 3 of operational amplifier U1A is connected with a pin of another pin of inductance L 2, resistance R 4, a pin of capacitor C 6; The pin 2 of operational amplifier U1A is connected with the pin of resistance R 5, R8; The pin 1 of operational amplifier U1A is connected with another pin of resistance R 8; The pin 8 of operational amplifier U1A is connected with power supply VCC; Pin 4 ground connection of operational amplifier U1A.The pin 5 of operational amplifier U1B is connected with a pin of another pin of inductance L 3, resistance R 3, a pin of capacitor C 5; 6 pins of operational amplifier U1B are connected with the pin of resistance R 6, R7; The pin 7 of operational amplifier U1B is connected with another pin of resistance R 7.Another pin ground connection of resistance R 1, R2, R3, R4 and capacitor C 3, C4, C5, C6.
Antenna condition testing circuit according to utility model content and the described the electric circuit constitute ship automatic identification system terminal of accompanying drawing 2, be arranged between the power amplifier and antenna in the onboard AIS terminal, then the pin 7 of the pin 1 of operational amplifier U1A and U1B is connected on analog to digital conversion (ADC) IO mouth in the onboard AIS terminal.When transmitting, start ADC, judge the abnormal of antenna and power amplifier according to the result of two-way ADC.If have abnormal, warning information be presented on the LCDs of onboard AIS terminal and send prompting sound, reminding the staff in time to take appropriate measures, thereby eliminated because antenna or power amplifier problem cause that equipment failure causes serious potential safety hazard.
Claims (2)
1. an antenna condition testing circuit that is used for ship automatic identification system terminal, is characterized in that the antenna condition testing circuit is by operational amplifier U1A, U1B, coupling inductance L1, inductor L2, L3, diode D1, D2, capacitor C 1～C6, resistance R 1～R6 forms, wherein:
Described coupling inductance L1, wherein pin 1 is connected with a pin of power amplifier, capacitor C 1, and pin 2 is connected with a pin of antenna, capacitor C 2;
Described diode D1, negative pole is connected with another pin of capacitor C 1, a pin of capacitor C 3, a pin of inductance L 2, and positive pole is connected with the pin 4 of coupling inductance L1, a pin of resistance R 1;
Described diode D2, negative pole is connected with another pin of capacitor C 2, a pin of capacitor C 4, a pin of inductance L 3, and positive pole is connected with the pin 3 of coupling inductance L1, a pin of resistance R 2;
Described operational amplifier U1A, pin 3 is connected with another pin of inductance L 2, a pin of resistance R 4, a pin of capacitor C 6, and pin 2 is connected with the pin of resistance R 5, R8, and pin 1 is connected with another pin of resistance R 8; Pin 8 is connected with power supply VCC, pin 4 ground connection;
Described operational amplifier U1B, pin 5 is connected with another pin of inductance L 3, a pin of resistance R 3, a pin of capacitor C 5, and pin 6 is connected with the pin of resistance R 6, R7, and pin 7 is connected with another pin of resistance R 7;
Another pin ground connection of described resistance R 1, R2, R3, R4;
Another pin ground connection of described capacitor C 3, C4, C5, C6.
2. according to the antenna condition testing circuit for ship automatic identification system terminal claimed in claim 1, it is characterized in that the pin 1 of described coupling inductance L1 passes the hollow magnetic core with pin 2 by thicker enameled wire; Pin 3 passes the hollow magnetic core around 5～10 circles with pin 4 by thinner enameled wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220550512 CN202929137U (en) | 2012-10-24 | 2012-10-24 | Antenna state detection circuit applied to ship automatic identification system terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220550512 CN202929137U (en) | 2012-10-24 | 2012-10-24 | Antenna state detection circuit applied to ship automatic identification system terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202929137U true CN202929137U (en) | 2013-05-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220550512 Withdrawn - After Issue CN202929137U (en) | 2012-10-24 | 2012-10-24 | Antenna state detection circuit applied to ship automatic identification system terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202929137U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890215A (en) * | 2012-10-24 | 2013-01-23 | 福建师范大学 | Antenna state detection circuit for ship automatic identification system terminal |
| CN112534728A (en) * | 2018-09-18 | 2021-03-19 | 阿尔卑斯阿尔派株式会社 | Amplifier module |
-
2012
- 2012-10-24 CN CN 201220550512 patent/CN202929137U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102890215A (en) * | 2012-10-24 | 2013-01-23 | 福建师范大学 | Antenna state detection circuit for ship automatic identification system terminal |
| CN102890215B (en) * | 2012-10-24 | 2015-04-08 | 福建师范大学 | Antenna state detection circuit for ship automatic identification system terminal |
| CN112534728A (en) * | 2018-09-18 | 2021-03-19 | 阿尔卑斯阿尔派株式会社 | Amplifier module |
| CN112534728B (en) * | 2018-09-18 | 2022-10-28 | 阿尔卑斯阿尔派株式会社 | Amplifier module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130508 Effective date of abandoning: 20150408 |
|
| RGAV | Abandon patent right to avoid regrant |