CN103575306A - Passive wireless multi-parameter sensor system and multi-parameter measurement method thereof - Google Patents
Passive wireless multi-parameter sensor system and multi-parameter measurement method thereof Download PDFInfo
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- CN103575306A CN103575306A CN201310579205.5A CN201310579205A CN103575306A CN 103575306 A CN103575306 A CN 103575306A CN 201310579205 A CN201310579205 A CN 201310579205A CN 103575306 A CN103575306 A CN 103575306A
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Abstract
The invention discloses a passive wireless multi-parameter sensor system and a multi-parameter measurement method of the passive wireless multi-parameter sensor system. Multi-parameter measurement and signal transmission are achieved according to the time-division multiplexing technology. The system comprises a primary system and a subsystem. A signal transmitted by the primary system serves as a modulation carrier and also provides energy for the subsystem. The subsystem receives the signal transmitted by the primary system, and the signal is subject to circuit rectification and voltage stabilization and then provides energy for the subsystem. The subsystem comprises a plurality of capacitance-type sensors sensing changes of system-environment physical quantities. Capacitance signals of the sensors are converted into frequency signals through a C-F conversion circuit; then switching-on and switching-off of a load switch are controlled by multi-path frequency signals through one transmission channel according to the time-division multiplexing technology, and load modulation of a circuit is completed by changing the load impedance of the subsystem. Modulated signals are received by the primary system through inductive coupling to carry out demodulation and amplifying processing. Due to the adoption of the system, the number of measured parameters can be conveniently increased, and it is only required that the number of frequency dividers is increased and the state switching ability of a multiple-way switch is improved.
Description
Technical field
The present invention relates to a kind of passive and wireless multi-parameter sensor telemetry, relate in particular to a kind of passive and wireless multi-parameter sensor system and Multi-parameter Measurement Method thereof.
Background technology
Passive and wireless multi-parameter sensor system, without line transmissions, also without Power supply, has comparatively optimistic application prospect in complex industrial environmental monitoring, to promoting the development of China's Internet of Things to have great function.RFID technology in the past, needs battery, and the life-span is short.Generally can only realize one-parameter and measure, and need to be operated in characteristic frequency.Internal circuit is complicated, relies on single-chip microcomputer, storer etc. to carry out signal transmission, needs synchronous clock, and cost is high, applies limited.
Summary of the invention
Goal of the invention: for above-mentioned prior art, provide a kind of passive and wireless multi-parameter sensor system, can realize the passive and wireless transmission of measuring multiple parameters and signal.
Another object of the present invention is to provide a kind of passive and wireless multi-parameter sensor measurement method of parameters.
Technical scheme: a kind of passive and wireless multi-parameter sensor system, comprises main system and subsystem; Described main system can be connected to come transferring energy and signal by inductive coupling with subsystem; Wherein, described main system comprises year wave generation circuit and the envelope detection circuit being connected with the first coupling inductance respectively, also comprises the signal amplification circuit being connected with described envelope detection circuit; Described subsystem comprises the regulator rectifier circuit being connected with the second coupling inductance, also comprises the multi-parameter sensor C-F change-over circuit, time multiplexing circuit and the load-modulate circuit that connect successively; It is subsystem power supply that described regulator rectifier circuit is used for the energy conversion being coupled to become stable output voltage; Wherein, described time multiplexing circuit was used within a clock period, and gating multi-parameter sensor C-F change-over circuit is exported the frequency signal of a plurality of parameters, and outputed to described load-modulate circuit through a transmission channel.
As preferred version of the present invention, described time multiplexing circuit comprises clock generation circuit, frequency divider and the multi-way switch connecting successively, and described multi-way switch connects described load-modulate circuit; Described multi-parameter sensor C-F change-over circuit comprises some sensor C-F change-over circuit modules, is used for respectively converting the capacitance signal of a plurality of sensors to frequency signal; Described clock generation circuit and frequency divider produce logic control signal, control a certain signal in the frequency signal of a plurality of parameters that described multi-way switch gating is converted to by described multi-parameter sensor C-F change-over circuit.
A multi-parameter sensor Multi-parameter Measurement Method, first, the wave generation circuit that carries of main system sends pumping signal, via being inductively coupled in subsystem circuit, carries out rectification and energy storage, and after voltage stabilization, subsystem circuit is started working; In subsystem, time multiplexing circuit is sent after clock signal by clock generation circuit, through frequency divider, produces multi-channel switch power logic control signal; When the physical quantity that multi-parameter sensor is surveyed in subsystem changes, the electric capacity of different sensors changes, and by multi-parameter sensor C-F change-over circuit, completes electric capacity to the conversion of frequency signal; Multi-channel switch power logic control signal is controlled multi-way switch gating, within a clock period, the frequency signal of a plurality of parameters of multi-parameter sensor C-F change-over circuit output is transferred to load-modulate circuit according to scheduled timing via a transmission channel; The impedance of load-modulate circuit changes, and the signal amplitude in subsystem coupling inductance is changed; The variation of signal amplitude reaches main system through coupling, the envelope detection circuit in main system to the signal demodulation of being coupled to after, then by signal amplification circuit, process the measured value that can obtain different sensors.
Beneficial effect: compared with prior art, technical scheme of the present invention has following beneficial effect:
1, native system is controlled multi-parameter sensor C-F change-over circuit by time multiplexing circuit, can complete the measurement of a plurality of parameters simultaneously; And based on this time-division multiplex technology, can conveniently expand the number of parameters of measurement, only need to increase the gating capabilities of frequency divider number and multi-way switch.Overcome when hyperchannel gathers simultaneously, take hardware resource many, waste the shortcomings such as serious.
2,, with respect to existing RFID technology, the time-division multiplex technology that this patent proposes is without by means of single-chip microcomputer and storer, without coding, do not need primary and secondary system synchronization clock, only, by inductive coupling, sequential control is simple, workload is little, and cost is low, to quality of voltage, requires low.Effectively saved system resource, complicated control system is become simply, and low in energy consumption, cost is low.
3, compare traditional capacitive pick-up electric capacity and convert voltage signal to, the present invention adopts and converts sensor capacitance to frequency signal, and anti-interference is stronger.
4, utilize the frequency signal being converted to carry out load-modulate to circuit, by inductive coupling transmission of signal, without the carrier signal of characteristic frequency, to carrier signal, require low.
Accompanying drawing explanation
Fig. 1 is the structural representation of system of the present invention;
Fig. 2 is subsystem electrical block diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is done further and explained.
As shown in Figure 1, a kind of passive and wireless multi-parameter sensor system comprises main system and subsystem; Main system is connected to come transferring energy and signal with subsystem by inductive coupling.Wherein, main system comprises year wave generation circuit 2 and the envelope detection circuit 3 being connected with the first coupling inductance respectively, also comprises the signal amplification circuit 4 being connected with envelope detection circuit 3.Subsystem comprises the regulator rectifier circuit 5 being connected with the second coupling inductance, also comprises the multi-parameter sensor C-F change-over circuit 6, time multiplexing circuit 7 and the load-modulate circuit 8 that connect successively.Wherein, carry wave generation circuit 2 and adopt high-efficient E type switch power amplifier, by coupling inductance, signal is launched.It is multi-parameter sensor C-F change-over circuit 6, time multiplexing circuit 7 and 8 power supplies of load-modulate circuit in subsystem that regulator rectifier circuit 5 is used for the energy conversion being coupled to become stable output voltage.
As shown in Figure 2, time multiplexing circuit 7 comprises clock generation circuit 9, frequency divider 10 and the multi-way switch 12 connecting successively.Multi-way switch 12 connects load-modulate circuit 8.Multi-parameter sensor C-F change-over circuit 6 comprises some sensor C-F change-over circuit modules, is used for respectively converting the capacitance signal of a plurality of sensors to frequency signal.In the present embodiment, this multi-parameter sensor C-F change-over circuit 6 comprises three sensors; This multi-way switch 12 is one-out-three multi-way switch; Clock generation circuit 9 is the clock circuit based on accurate silicon oscillator; Frequency divider 10 is the divider circuit forming based on JK flip-flop; Multi-parameter sensor C-F change-over circuit 6 is the change-over circuit forming based on Schmidt trigger; Load-modulate circuit 8 consists of a metal-oxide-semiconductor resistance in series.Clock generation circuit 9 and frequency divider 10 produce logic control signal, a certain channel in the frequency signal of a plurality of parameters that control multi-way switch 12 gatings are converted to by multi-parameter sensor C-F change-over circuit 6, and within a clock period, multi-parameter sensor C-F change-over circuit is exported to the frequency signal of a plurality of parameters, through a transmission channel, outputed to load-modulate circuit 8.
Passive and wireless multi-parameter sensor Multi-parameter Measurement Method based on above-mentioned, first, the wave generation circuit that carries of main system sends pumping signal, via being inductively coupled in subsystem circuit, carries out rectification and energy storage, and after voltage stabilization, subsystem circuit is started working; In subsystem, time multiplexing circuit is sent after clock signal by clock generation circuit, through frequency divider, produces multi-channel switch power logic control signal; When the physical quantity that multi-parameter sensor is surveyed in subsystem changes, the electric capacity of different sensors changes, and by multi-parameter sensor C-F change-over circuit, completes electric capacity to the conversion of frequency signal, generates the frequency signal of strong interference immunity; A certain channel in the frequency signal of a plurality of passages of multi-channel switch power logic control signal control multi-way switch gating, within a clock period, the frequency signal of a plurality of parameters of multi-parameter sensor C-F change-over circuit output is transferred to load-modulate circuit according to scheduled timing via a transmission channel; In this output signal control load modulation circuit, MOS switching tube break-make changes the loaded impedance of subsystem, and the signal amplitude on subsystem inductance is changed along with impedance variation, thereby completes the load-modulate to subsystem; The variation of signal amplitude reaches main system through coupling, the envelope detection circuit in main system to the signal demodulation of being coupled to after, then by signal amplification circuit, process the measured value that can obtain obtaining different sensors.
In the present invention, main system completes carrier transmit and reception, and signal demodulation function.The signal that main system is sent is both as modulated carrier, also for subsystem provides energy.By the inductive coupling between primary and secondary system, subsystem receive signal that main system sends and after rectifying and voltage-stabilizing for self provides energy.The variation that subsystem comprises three different capacitance type sensor induced environment physical quantitys; By C-F change-over circuit, convert the capacitance signal of sensor to frequency signal; Recycling time-division multiplex technology via a transmission channel control load switch on and off, when circuit load impedance variation, can make the signal amplitude respective change on inductance by the frequency signal of different sensors, carrier signal is completed to load-modulate.By inductive coupling, the signal that main system receives after modulation carries out demodulation and amplifies and process.
While using passive and wireless multi-parameter sensor system of the present invention, first use standard device to demarcate passive wireless sensor, set up frequency change and the corresponding relation between physical quantity of surveying.During system works, by the frequency of the output signal of main system, contrast with calibration value, can obtain the variation of measured physical quantity.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. a passive and wireless multi-parameter sensor system, is characterized in that: comprise main system and subsystem; Described main system can be connected to come transferring energy and signal by inductive coupling with subsystem; Wherein, described main system comprises year wave generation circuit (2) and the envelope detection circuit (3) being connected with the first coupling inductance respectively, also comprises the signal amplification circuit (4) being connected with described envelope detection circuit (3); Described subsystem comprises the regulator rectifier circuit (5) being connected with the second coupling inductance, also comprises the multi-parameter sensor C-F change-over circuit (6), time multiplexing circuit (7) and the load-modulate circuit (8) that connect successively; It is subsystem power supply that described regulator rectifier circuit (5) is used for the energy conversion being coupled to become stable output voltage; Wherein, described time multiplexing circuit (7) was used within a clock period, and gating multi-parameter sensor C-F change-over circuit is exported the frequency signal of a plurality of parameters, and outputed to described load-modulate circuit (8) through a transmission channel.
2. a kind of passive and wireless multi-parameter sensor system according to claim 1, it is characterized in that: described time multiplexing circuit (7) comprises clock generation circuit (9), frequency divider (10) and the multi-way switch (12) connecting successively, and described multi-way switch (12) connects described load-modulate circuit (8); Described multi-parameter sensor C-F change-over circuit (6) comprises some sensor C-F change-over circuit modules, is used for respectively converting the capacitance signal of a plurality of sensors to frequency signal; Described clock generation circuit (9) and frequency divider (10) produce logic control signal, control a certain signal in the frequency signal of a plurality of parameters that described multi-way switch (12) gating is converted to by described multi-parameter sensor C-F change-over circuit (6).
3. a kind of passive and wireless multi-parameter sensor Multi-parameter Measurement Method as claimed in claim 2, it is characterized in that: first, the wave generation circuit that carries of main system sends pumping signal, via being inductively coupled in subsystem circuit, carry out rectification and energy storage, after voltage stabilization, subsystem circuit is started working; In subsystem, time multiplexing circuit is sent after clock signal by clock generation circuit, through frequency divider, produces multi-channel switch power logic control signal; When the physical quantity that multi-parameter sensor is surveyed in subsystem changes, the electric capacity of different sensors changes, and by multi-parameter sensor C-F change-over circuit, completes electric capacity to the conversion of frequency signal; Multi-channel switch power logic control signal is controlled multi-way switch gating, within a clock period, the frequency signal of a plurality of parameters of multi-parameter sensor C-F change-over circuit output is transferred to load-modulate circuit according to scheduled timing via a transmission channel; The impedance of load-modulate circuit changes, and the signal amplitude in subsystem coupling inductance is changed; The variation of signal amplitude reaches main system through coupling, the envelope detection circuit in main system to the signal demodulation of being coupled to after, then by signal amplification circuit, process the measured value that can obtain different sensors.
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Cited By (7)
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| CN103925944A (en) * | 2014-04-11 | 2014-07-16 | 东南大学 | Airtight spraying room environment monitoring system based on passive wireless sensing technology |
| CN105806410A (en) * | 2016-03-31 | 2016-07-27 | 东南大学 | Multipoint pressure-sensor passive wireless measuring circuit |
| CN106683387A (en) * | 2016-12-10 | 2017-05-17 | 杭州鸿雁智能科技有限公司 | Passive sensing device and passive type wireless sensing system |
| CN108347802A (en) * | 2018-01-17 | 2018-07-31 | 昂宝电子（上海）有限公司 | Utilize the multiplex circuit system of signal wire time sharing transmissions signal and electric energy |
| CN108444502A (en) * | 2018-03-28 | 2018-08-24 | 武汉大学 | A kind of sensing system and measurement method based on wireless power transmission |
| CN110426064A (en) * | 2019-07-18 | 2019-11-08 | 东南大学 | Wireless sourceless sensor and wireless and passive method for sensing |
| CN113992005A (en) * | 2021-10-18 | 2022-01-28 | Tcl华星光电技术有限公司 | Display power supply module and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103925944A (en) * | 2014-04-11 | 2014-07-16 | 东南大学 | Airtight spraying room environment monitoring system based on passive wireless sensing technology |
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| CN110426064A (en) * | 2019-07-18 | 2019-11-08 | 东南大学 | Wireless sourceless sensor and wireless and passive method for sensing |
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| CN113992005B (en) * | 2021-10-18 | 2024-01-30 | Tcl华星光电技术有限公司 | Display power supply module and display device |
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Application publication date: 20140212 |