CN109870950A - A kind of control system based on GPRS communication - Google Patents
A kind of control system based on GPRS communication Download PDFInfo
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- CN109870950A CN109870950A CN201910040352.2A CN201910040352A CN109870950A CN 109870950 A CN109870950 A CN 109870950A CN 201910040352 A CN201910040352 A CN 201910040352A CN 109870950 A CN109870950 A CN 109870950A
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- 238000004891 communication Methods 0.000 title claims abstract description 34
- 230000005611 electricity Effects 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims abstract description 7
- 239000003990 capacitor Substances 0.000 claims description 46
- 238000005070 sampling Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
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Abstract
The present invention relates to field of intelligent control more particularly to a kind of control systems based on GPRS communication, comprising: battery and power supply module for power supply；The first switch circuit acquired for controlling cell output voltage being connect with battery；With power supply module and first switch circuit connection, for filtering out the filter module of the voltage sampling signal generated when power supply module output voltage falls fluctuation；It is connect with battery, GPRS communication module, for controlling the second switch circuit of GPRS communication module switching electricity；The control module connecting with first switch circuit, filter module, second switch circuit and GPRS communication module, when the signal of filter module output is lower than given threshold, control module controls second switch circuit and disconnects.By using the present invention, following effect may be implemented: effectively filtering out the voltage sampling signal fluctuation generated when power supply module output voltage falls by filter module, power supply module is closed due to the signal fluctuation so as to avoid single-chip microcontroller.
Description
Technical field
The present invention relates to instrument control field more particularly to a kind of control systems based on GPRS communication.
Background technique
With scientific and technological progress, gasification engineering is rapidly developed in the information age.No matter household or public domain use
" intelligence " increasingly closeness to life.Intelligent gas meter, remote wireless meter recording also develop towards network intelligence direction.State at present
Long-distance meter-reading system has been applied successfully in interior most cities.In various wireless communication mode, the GPRS communication technology is because of its transmission
Rate is fast, long transmission distance.It has been used as one of intelligent gas meter Primary communication mode.
In intelligent gas meter, commonly using power supply mode is 4 section alkaline batteries or lithium battery power supply.It is communicated when using GPRS
When, there are the 2 above burst currents of peace in communication, because of temperature, battery maximum output current reason, burst current will cause when generating
Power supply is of short duration to be fallen.When the value of single-chip microcontroller sampling is lower than given threshold, there is false triggering under-voltage protection in system, and gas meter, flow meter executes
Under-voltage locking closes valve, while single-chip microcontroller can execute closing power supply, and screen shows that battery undervoltage needs to change battery, single-chip microcontroller into
Enter deep sleep mode.And there is no really run out of battery at this time.Problems are especially in low temperature and weak signal environment, electricity
It is particularly evident when pond is passivated, it causes user's service time of battery to shorten, increases user's gas cost, influence user experience and draw
Play meaningless customer complaint.
Summary of the invention
To solve the above problems, the present invention proposes a kind of control system based on GPRS communication, power supply mould has been effectively filtered out
The signal that block output voltage generates when falling, avoid control module to the insufficient erroneous judgement of cell voltage.
A kind of control system based on GPRS communication, comprising:
Battery and power supply module for power supply；
The first switch circuit acquired for controlling cell output voltage being connect with battery；
With power supply module and first switch circuit connection, generated when power supply module output voltage falls for filtering out
The filter module of voltage sampling signal fluctuation；
It is connect with battery, GPRS communication module, for controlling the second switch circuit of GPRS communication module switching electricity；
The control module being connect with first switch circuit, filter module, second switch circuit and GPRS communication module, when
When the signal of filter module output is lower than given threshold, control module controls second switch circuit and disconnects.
Preferably, the power supply module includes linear power supply U20 and capacitor C25, C26, C27, and the one of the capacitor C25
The output end VCC of end connection power module, other end ground connection, the input terminal of one end connection linear power supply U20 of the capacitor C26
VIN, other end ground connection, the output end VOUT of one end connection linear power supply U20 of the capacitor C27, other end ground connection, the line
The input terminal VIN connection battery output of property power supply U20, the output of the output end VOUT connection power module of linear power supply U20
Hold VCC, the ground terminal GND ground connection of linear power supply U20.
Preferably, the first switch circuit includes triode Q20, Q21, resistance R22, R23, the triode Q20's
Emitter connects power supply module, one end of the collector connection resistance R23 of triode Q20, and the base stage of triode Q20 connects three poles
The collector of pipe Q21, the other end connection filter module of the resistance R23 and one end of resistance R22, the resistance R22's
Other end ground connection, the control terminal of the base stage link control module of the triode Q21, the emitter connection second of triode Q21
Switching circuit.
Preferably, the first switch circuit further includes resistance R20, R21, one end connecting triode of the resistance R20
The base stage of Q20, the collector of other end connecting triode Q21, the base stage of one end connecting triode Q21 of the resistance R21, separately
The control terminal of one end link control module.
Preferably, the filter module includes sequentially connected first filter circuit and the second filter circuit.
Preferably, first filter circuit and the second filter circuit cutoff frequency are 217Hz, -30dB decaying.
Preferably, first filter module includes operational amplifier U1A, resistance R1, R2 and capacitor C2, C3, described
The output end of one end connection first switch circuit of resistance R1, the other end connect one end of resistance R2 and one end of capacitor C3,
One end of the other end connection capacitor C2 of the resistance R2 and the non-inverting input terminal+INA of operational amplifier U1A, the capacitor
The other end of C3 connects the second filter circuit and the inverting input terminal-INA of operational amplifier U1A, and the capacitor C2's is another
The output end of end ground connection, the operational amplifier U1A connects the second filter circuit, the feeder ear V+ connection of operational amplifier U1A
The ground terminal G of the output end VCC of power module, operational amplifier U1A are grounded GND.
Preferably, second filter module includes operational amplifier U1B, resistance R3, R4 and capacitor C1, C4, described
One end of resistance R3 connects the output end of the first filter circuit, and the other end connects one end of resistance R4 and one end of capacitor C4,
One end of the other end connection capacitor C1 of the resistance R4 and the non-inverting input terminal+INB of operational amplifier U1B, the capacitor
The input terminal of the other end link control module of C4 and the inverting input terminal-INB of operational amplifier U1B, the capacitor C1's
Other end ground connection, the input terminal of the output end link control module of the operational amplifier U1B.
Preferably, the conducting and disconnection of the control module periodically control first switch circuit.
It preferably, further include the display module being connect with control module, when the signal of filter module output is lower than setting threshold
When value, control module controls display module and shows battery undervoltage information.
By using the present invention, following effect may be implemented:
1. the voltage sampling signal fluctuation generated when power supply module output voltage falls is effectively filtered out by filter module, from
And avoid single-chip microcontroller and second switch module is closed due to the signal fluctuation, it also avoids therefore replacing battery, to have
Effect reduces customer using cost, reduces complaint and feedback caused by user falls due to power supply；
2. being divided using resistance R22, R23, the voltage range of partial pressure is in control module to guarantee sampled signal high-precision
Identification range in；
3. the conducting and disconnection of control module periodically control first switch circuit, realize the periodicity for using signal, protect
The low power dissipation design of card system.
Detailed description of the invention
The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is the overall structure diagram of the embodiment of the present invention；
Fig. 2 is the circuit diagram of power supply module in the embodiment of the present invention；
Fig. 3 is the circuit diagram of switching circuit in the embodiment of the present invention；
Fig. 4 is the circuit diagram of filter module in the embodiment of the present invention.
Specific embodiment
Below in conjunction with attached drawing, technical scheme of the present invention will be further described, but the present invention is not limited to these realities
Apply example.
The basic idea of the invention is that effectively filtering out the electricity generated when power supply module output voltage falls by filter module
Sampled signal fluctuation is pressed, second switch module is closed due to the signal fluctuation so as to avoid single-chip microcontroller, is also avoided therefore
And battery is replaced, so that customer using cost be effectively reduced, reduce complaint and feedback caused by user falls due to power supply.
As shown in Figure 1, the present embodiment provides a kind of control systems based on GPRS communication, comprising: the battery for power supply
And power supply module；The first switch circuit acquired for controlling cell output voltage being connect with battery；With power supply module with
And first switch circuit connection, for filtering out the filter of the voltage sampling signal generated when power supply module output voltage falls fluctuation
Wave module；It is connect with battery, GPRS communication module, for controlling the second switch circuit of GPRS communication module switching electricity；With
First switch circuit, filter module, second switch circuit and the control module of GPRS communication module connection, when filter module is defeated
When signal out is lower than given threshold, control module controls second switch circuit and disconnects；The display module being connect with control module,
When the signal of filter module output is lower than given threshold, control module controls display module and shows battery undervoltage information.
As shown in Fig. 2, in the present embodiment, power supply module includes linear power supply U20 and capacitor C25, C26, C27.Institute
State the output end VCC of one end connection power module of capacitor C25, other end ground connection, the linear electricity of one end connection of the capacitor C26
The input terminal VIN of source U20, other end ground connection, the output end VOUT of one end connection linear power supply U20 of the capacitor C27 are another
End ground connection, the input terminal VIN connection battery output of the linear power supply U20, the output end VOUT connection electricity of linear power supply U20
The ground terminal GND of the output end VCC of source module, linear power supply U20 are grounded.
Wherein, linear power supply U20 has the characteristics that low-power consumption, high Ripple Suppression ratio.Capacitor C25, C26, C27 are filtered electrical
Hold, capacitor C25 selects large capacity ceramic condenser, and the output pulsation of caused linear power supply U20, keeps away when for preventing GPRS from communicating
Exempt from the job insecurity of operational amplifier.
As shown in figure 3, in the present embodiment, first switch circuit include triode Q20, Q21, resistance R20, R21, R22,
R23.The emitter of the triode Q20 connects power supply module, one end of the collector connection resistance R23 of triode Q20, three poles
One end of the base stage connection resistance R20 of pipe Q20, the other end of the resistance R23 connect the one of filter module and resistance R22
End, the other end ground connection of the resistance R22, the collector of the other end connecting triode Q21 of the resistance R20, triode Q21
Base stage connection resistance R21 one end, the control terminal of the other end link control module of the resistance R21, the hair of triode Q21
Emitter-base bandgap grading connects second switch circuit.
Control module passes through the sampling switch of triode Q20, Q21 composition to the sampled signal of battery.Control module passes through
Control terminal AD_CTRL controls triode Q21 conducting, so that triode Q20 conducting is controlled, to realize signal sampling.To realize
The low power operation of system, control module periodically open triode Q21, realize periodic samples.Wherein, resistance R21, R20
For current-limiting resistance, resistance R23, R21 are sampling partial pressure precision resister, and battery sampling signal voltage is known higher than control module I/O port
Other voltage is set voltage in identification level range by resistance R23, R21.
As shown in figure 4, in the present embodiment, filter module includes sequentially connected first filter circuit and the second filtered electrical
Road, the first filter circuit and the second filter circuit use identical structure.First filter circuit and the second filter circuit cutoff frequency
Rate is 217Hz, and -30dB decaying can effectively filter out the fluctuation for causing sampled signal when power supply module output voltage falls.
Specifically, the first filter module includes operational amplifier U1A, resistance R1, R2 and capacitor C2, C3, the resistance
The output end of one end connection first switch circuit of R1, the other end connects one end of resistance R2 and one end of capacitor C3, described
One end of the other end connection capacitor C2 of resistance R2 and the non-inverting input terminal+INA of operational amplifier U1A, the capacitor C3's
The other end connects the second filter circuit and the inverting input terminal-INA of operational amplifier U1A, another termination of the capacitor C2
The output end on ground, the operational amplifier U1A connects the second filter circuit, the feeder ear V+ connection power supply of operational amplifier U1A
The ground terminal G of the output end VCC of module, operational amplifier U1A are grounded GND.
Second filter module includes operational amplifier U1B, resistance R3, R4 and capacitor C1, C4, one end of the resistance R3
The output end of the first filter circuit is connected, the other end connects one end of resistance R4 and one end of capacitor C4, the resistance R4's
The other end connects one end of capacitor C1 and the other end of the non-inverting input terminal+INB, the capacitor C4 of operational amplifier U1B connect
Meet the input terminal of control module and the other end ground connection of the inverting input terminal-INB, the capacitor C1 of operational amplifier U1B, institute
State the input terminal of the output end link control module of operational amplifier U1B.
First filter circuit and the second filter circuit are the active second order Butterworth filter of Sallen_Key.With first
For filter circuit, resistance R1, R2 and capacitor C2, C3 form two-stage RC filter circuit, are output to operation in operational amplifier
A negative-feedback is introduced between amplifier homophase input, it is not identical in the polarity of different frequency ranges, feedback, as signal frequency f >
When > f0 (f0 is cutoff frequency 217Hz), the phase shift of every grade of RC filter circuit tends to -90 °, the phase shift of two-stage RC filter circuit
To -180 °, the output voltage of RC filter circuit and the opposite in phase of input voltage, so when operation amplifier guided to by capacitor C3
The feedback of device in-phase end is negative-feedback, and feedback signal will play a part of weakening input signal, reduces voltage amplification factor, institute
The amplitude-frequency characteristic front end for making second order active low-pass filter is decayed rapidly with the feedback, only low frequency end signal is allowed to pass through.
In the present embodiment, control module uses single-chip microcontroller.Single-chip microcontroller is a kind of IC chip, is advised using super large
Vlsi die technology is the central processor CPU random access memory ram, read only memory ROM, more with data-handling capacity
The functions such as I/O mouthfuls of kind and interruption system, timer/timer (may further include display driver circuit, pulse-width modulation circuit, mould
The circuits such as quasi- multiplexer, A/D converter) it is integrated into the small and perfect microcomputer system of one constituted on one piece of silicon wafer
System.
In the present embodiment, the conducting and disconnection of control module periodically control first switch circuit, it is right always to avoid
Battery output is sampled, to ensure that the low power operation of whole system.
On the other hand, when the signal of filter module output is lower than given threshold, control module controls second switch circuit
It disconnects.Since filter module has filtered out the signal fluctuation generated when cell output voltage falls, control module is sentenced at this time
The signal of the disconnected output of filter module out is lower than given threshold, then illustrates that the output voltage of battery is lower, control module control second
Switching circuit disconnects, and GPRS communication module does not work.The display module of control module control simultaneously shows battery undervoltage information, reminds
User replaces battery in time.
In the present embodiment, second switch circuit uses circuit structure identical with first switch circuit, but not to it
Circuit structure is defined.The control terminal link control module of second switch circuit receives the control signal of control module.
Those skilled in the art can make various modifications to described specific embodiment
Or supplement or be substituted in a similar manner, however, it does not deviate from the spirit of the invention or surmounts the appended claims determines
The range of justice.
Claims (10)
1. a kind of control system based on GPRS communication characterized by comprising
Battery and power supply module for power supply；
The first switch circuit acquired for controlling cell output voltage being connect with battery；
With power supply module and first switch circuit connection, for filtering out the voltage generated when power supply module output voltage falls
The filter module of sampled signal fluctuation；
It is connect with battery, GPRS communication module, for controlling the second switch circuit of GPRS communication module switching electricity；
The control module connecting with first switch circuit, filter module, second switch circuit and GPRS communication module, works as filtering
When the signal of module output is lower than given threshold, control module controls second switch circuit and disconnects.
2. the control system according to claim 1 based on GPRS communication, which is characterized in that the power supply module includes line
Property power supply U20 and capacitor C25, C26, C27, the output end VCC of one end connection power module of the capacitor C25, the other end
Ground connection, the input terminal VIN of one end connection linear power supply U20 of the capacitor C26, other end ground connection, one end of the capacitor C27
Connect the output end VOUT of linear power supply U20, other end ground connection, the input terminal VIN connection battery output of the linear power supply U20
End, the ground terminal GND ground connection of the output end VCC of the output end VOUT connection power module of linear power supply U20, linear power supply U20.
3. the control system according to claim 1 based on GPRS communication, which is characterized in that the first switch circuit packet
Triode Q20, Q21, resistance R22, R23 are included, the emitter of the triode Q20 connects power supply module, the current collection of triode Q20
Pole connects one end of resistance R23, the collector of the base stage connecting triode Q21 of triode Q20, the other end of the resistance R23
Connect filter module and one end of resistance R22, the other end ground connection of the resistance R22, the base stage connection of the triode Q21
The emitter of the control terminal of control module, triode Q21 connects second switch circuit.
4. the control system according to claim 3 based on GPRS communication, which is characterized in that the first switch circuit is also
Including resistance R20, R21, the base stage of one end connecting triode Q20 of the resistance R20, the collection of other end connecting triode Q21
Electrode, the base stage of one end connecting triode Q21 of the resistance R21, the control terminal of other end link control module.
5. it is according to claim 1 based on GPRS communication control system, which is characterized in that the filter module include according to
The first filter circuit and the second filter circuit of secondary connection.
6. it is according to claim 5 based on GPRS communication control system, which is characterized in that first filter circuit and
Second filter circuit cutoff frequency is 217Hz, -30dB decaying.
7. the control system according to claim 5 based on GPRS communication, which is characterized in that the first filter module packet
Include operational amplifier U1A, resistance R1, R2 and capacitor C2, C3, the output of one end connection first switch circuit of the resistance R1
End, the other end connect one end of resistance R2 and one end of capacitor C3, one end of the other end connection capacitor C2 of the resistance R2
And the other end of the non-inverting input terminal+INA, the capacitor C3 of operational amplifier U1A connects the second filter circuit and operation
The other end of the inverting input terminal-INA, the capacitor C2 of amplifier U1A are grounded, and the output end of the operational amplifier U1A connects
Connect the second filter circuit, the output end VCC of the feeder ear V+ connection power module of operational amplifier U1A, operational amplifier U1A's
Ground terminal G is grounded GND.
8. the control system according to claim 5 based on GPRS communication, which is characterized in that the second filter module packet
Operational amplifier U1B, resistance R3, R4 and capacitor C1, C4 are included, one end of the resistance R3 connects the output of the first filter circuit
End, the other end connect one end of resistance R4 and one end of capacitor C4, one end of the other end connection capacitor C1 of the resistance R4
And non-inverting input terminal+the INB of operational amplifier U1B, the input terminal of the other end link control module of the capacitor C4 and
The other end of the inverting input terminal-INB, the capacitor C1 of operational amplifier U1B are grounded, the output of the operational amplifier U1B
Hold the input terminal of link control module.
9. the control system according to claim 1 based on GPRS communication, which is characterized in that the control module is periodical
Control the conducting and disconnection of first switch circuit.
10. according to claim 1~9 it is described in any item based on GPRS communication control systems, which is characterized in that further include with
The display module of control module connection, when the signal of filter module output is lower than given threshold, control module control display mould
Block shows battery undervoltage information.
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| CN201910040352.2A CN109870950B (en) | 2019-01-16 | 2019-01-16 | Control system based on GPRS communication |
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|---|---|
| CN109870950B (en) | 2024-06-11 |
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