CN205356310U - Transmitter is felt on ground with self -calibration electric capacity - Google Patents
Transmitter is felt on ground with self -calibration electric capacity Download PDFInfo
- Publication number
- CN205356310U CN205356310U CN201620009399.4U CN201620009399U CN205356310U CN 205356310 U CN205356310 U CN 205356310U CN 201620009399 U CN201620009399 U CN 201620009399U CN 205356310 U CN205356310 U CN 205356310U
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- electric capacity
- relay
- ground
- capacitance
- utility
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- Testing Electric Properties And Detecting Electric Faults (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The utility model discloses a transmitter is felt on ground with self -calibration electric capacity, including power, microprocessor, encoder, carrier wave amplifier circuit, inductance, detection circuitry and variable capacitance circuit, the inductance with detection circuitry's signal detection end is connected, the variable capacitance circuit includes a plurality of electric capacity and a plurality of relay, and is a plurality of electric capacity is with a plurality of the relay one -to -one, it is a plurality of capacitance parallel connection, every electric capacity is established ties there is one the relay, it is a plurality of electric capacity all with detection circuitry's signal detection end is connected, and is a plurality of the signal control of relay end all with microprocessor's IO port is connected. The utility model discloses can make 125KHz low frequency carrier signal more stable, the precision is higher, need not purchase the large capacity adjustable capacitor, and installation and debugging are simple, and has reduced the consumption.
Description
Technical field
This utility model belongs to communication technical field, is specifically related to a kind of sense emitter in ground with automatic calibration capacitance.
Background technology
At present, low-frequency magnetic communication technology (LFMC) is data to be modulated on the low frequency carrier signal of 125KHz communicate, and this low frequency carrier signal is generally adopted LC resonant tank and carries out data transmit-receive.Being generally adopted the inductance value of first fixed inductance, the method regulating electric capacity makes LC loop resonance.But conventional method is to adjust electric capacity with an adjustable condenser, makes carrier signal reach specified altitude assignment.This method shortcoming: 1, the bad control of manual adjustments；2, each equipment to be adjusted once when installing, and installs extremely difficult, and poor stability, precision does not reach requirement；3, the bad purchase of tunable capacitor that capacity is big.
Utility model content
The purpose of this utility model is that provides a kind of sense emitter in ground with automatic calibration capacitance to solve the problems referred to above.
This utility model is achieved through the following technical solutions above-mentioned purpose:
A kind of sense emitter in ground with automatic calibration capacitance, including power supply, microprocessor, encoder, carrier wave amplifying circuit, inductance, testing circuit and variable capacitance circuit, described inductance is connected with the signal detection end of described testing circuit, described variable capacitance circuit includes multiple electric capacity and multiple relay, multiple described electric capacity and multiple described relay one_to_one corresponding, multiple described Capacitance parallel connections, each described capacitances in series has a described relay, multiple described electric capacity are all connected with the signal detection end of described testing circuit, the signal of multiple described relays controls end and is all connected with the I/O port of described microprocessor.
Preferably, described electric capacity and described relay are four.
Preferably, the capacitance of four described electric capacity respectively 27p, 13p, 6p and 3p.
The beneficial effects of the utility model are in that:
This utility model can make 125KHz low frequency carrier signal more stable, and precision is higher, need not buy Large Copacity adjustable condenser, and installation and debugging are simple, and reduce power consumption.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of the sense emitter in ground with automatic calibration capacitance described in the utility model；
Fig. 2 is the schematic diagram of variable capacitance circuit described in the utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As depicted in figs. 1 and 2, this utility model includes power supply, microprocessor, encoder, carrier wave amplifying circuit, inductance, testing circuit and variable capacitance circuit, inductance is connected with the signal detection end of testing circuit, variable capacitance circuit includes multiple electric capacity and multiple relay, multiple electric capacity and multiple relay one_to_one corresponding, multiple Capacitance parallel connections, each capacitances in series has a relay, multiple electric capacity are all connected with the signal detection end of testing circuit, and the signal of multiple relays controls end and is all connected with the I/O port of microprocessor.
As in figure 2 it is shown, in the present embodiment, electric capacity and relay are four, and four electric capacity are C1, C2, C3 and C4, and capacitance respectively 27p, 13p, 6p and 3p, and four relays are K1, K2, K3 and K4.
Needs according to practical situation, it is possible to the number of electric capacity and relay is elected as seven or other suitable number.
The sense emitter in ground with automatic calibration capacitance described in the utility model, can automatically calibrate low frequency carrier signal LC tank capacitance, produce loop replaces the adjustable condenser in original technology with condenser network network at 125KHz low frequency carrier signal, disconnection and the conducting of relay is controlled by microprocessor, microprocessor is to utilize binary weighting algorithm to realize the capacitance wanted, the carrier signal of Metacentre Height can not only be produced, and under different temperatures and humidity environment, also can automatically adjust.
In fig. 2, connect each electric capacity by relay, be parallel in LC loop with the method for binary weighting.Embody with voltage max owing to LC series resonant tank is characterized as being.As long as therefore detection voltage peak-peak is assured that resonant capacitance value, even if there being deviation, it is possible to the last two-stage electric capacity of fine adjustment reaches optimum state.So capacitance very accurately also need not can realize approximate resonance herein.
For stabilization signal height and precision, this utility model adopts crest voltage tracking, compares according to the peak value of voltage after resonance being detected and specified value, and taking out difference control supply voltage can complete.
Technical parameter of the present utility model is as follows:
Carrier frequency: 125KHz
Modulation system: PWM
Running voltage: 12VDC
Operating current: 160mA ± 60mA.
Operating temperature :-35～85 degrees Celsius
Working relative humidity: 5%-85%
These are only preferred embodiment of the present utility model, not in order to limit this utility model, all any amendment, equivalent replacement and improvement etc. made within spirit of the present utility model and principle, should be included in protection domain of the present utility model.
Claims (3)
1. a sense emitter in ground with automatic calibration capacitance, including power supply, microprocessor, encoder, carrier wave amplifying circuit, inductance and testing circuit, described inductance is connected with the signal detection end of described testing circuit, it is characterized in that: also include variable capacitance circuit, described variable capacitance circuit includes multiple electric capacity and multiple relay, multiple described electric capacity and multiple described relay one_to_one corresponding, multiple described Capacitance parallel connections, each described capacitances in series has a described relay, multiple described electric capacity are all connected with the signal detection end of described testing circuit, the signal of multiple described relays controls end and is all connected with the I/O port of described microprocessor.
2. the sense emitter in ground with automatic calibration capacitance according to claim 1, it is characterised in that: described electric capacity and described relay are four.
3. the sense emitter in ground with automatic calibration capacitance according to claim 1, it is characterised in that: the capacitance of four described electric capacity respectively 27p, 13p, 6p and 3p.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620009399.4U CN205356310U (en) | 2016-01-06 | 2016-01-06 | Transmitter is felt on ground with self -calibration electric capacity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620009399.4U CN205356310U (en) | 2016-01-06 | 2016-01-06 | Transmitter is felt on ground with self -calibration electric capacity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205356310U true CN205356310U (en) | 2016-06-29 |
Family
ID=56173235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620009399.4U Expired - Fee Related CN205356310U (en) | 2016-01-06 | 2016-01-06 | Transmitter is felt on ground with self -calibration electric capacity |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205356310U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019084828A1 (en) * | 2017-10-31 | 2019-05-09 | 深圳市小猫信息技术有限公司 | Vehicle detection device and parking management system |
-
2016
- 2016-01-06 CN CN201620009399.4U patent/CN205356310U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019084828A1 (en) * | 2017-10-31 | 2019-05-09 | 深圳市小猫信息技术有限公司 | Vehicle detection device and parking management system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20170106 |