CN102944259B - Wireless passive measuring device - Google Patents
Wireless passive measuring device Download PDFInfo
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- CN102944259B CN102944259B CN201210412964.8A CN201210412964A CN102944259B CN 102944259 B CN102944259 B CN 102944259B CN 201210412964 A CN201210412964 A CN 201210412964A CN 102944259 B CN102944259 B CN 102944259B
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Abstract
The invention provides a wireless passive measuring device. A first microcontroller controls the input of an electric source through a double-voltage power driving module; the electric source supplies electricity to a wireless passive measuring circuit sequentially through the double-voltage power driving module and a primary coil; the first microcontroller realizes the communication with the wireless passive measuring circuit through a first wireless module; the electric energy is coupled to a rectification and charging management module by a secondary coil and stored in a farad capacitor; the electricity is supplied to a second microcontroller and a sensor module via a voltage stabilizing circuit; the second microcontroller detects charging-discharging voltage of the farad capacitor in real time through a voltage monitoring module, and the farad capacitor is charged through an external control circuit; and the measured physical quantity is obtained by the sensor module and transmitted to the external control circuit through a second wireless module under the control of the second microcontroller, thereby realizing wireless passive measurement of the physical quantity. The wireless passive measuring device is applied to places where energy transmission and signal reading cannot be conducted by using conducting wires; and multiple simulative or digital physical quantities can be measured.
Description
Technical field
The present invention relates to wireless and passive field, particularly a kind of wireless and passive measurement mechanism.
Background technology
The development of modern measure technology, makes the measurement directly perceived of a lot of physical quantity become possibility, such as: pressure, temperature, humidity and flow etc.But very large restriction needs to carry out the supply of energy and the reading of data by wire, the application for some physical quantitys at measuring vessel inside, animal or human's body certain position inner is very unfavorable.
Chinese utility model patent " a kind of wireless and passive metering circuit " (publication number: CN201629035U, publication date: on November 10th, 2010) provide a kind of metering circuit of wireless and passive, namely realize the measurement to physical quantity by controlled capacitance or inductance, but this kind of measurable physical quantity of metering system is less, once can only measure a physical quantity and be difficult to realize test constantly.
Chinese utility model patent " a kind of wireless and passive measuring equipment " (publication number: CN201964897U, publication date: on September 7th, 2011) propose wireless and passive measure a kind of prioritization scheme, namely realize the working time that is energy-conservation thus raising system by the mode of periodic refreshing display data, but fail to provide concrete energy source and the implementation of energy conversion.
Summary of the invention
The invention provides a kind of wireless and passive measurement mechanism, solve owing to connecting wire to the restriction of range of application; Simultaneously can the multiple physical quantity of test constantly give concrete energy source and the implementation of energy conversion, described below:
A kind of wireless and passive measurement mechanism, comprising: external control circuit and wireless and passive metering circuit,
Described external control circuit comprises: the first microcontroller, and described first microcontroller controls the input of power supply by multiplication of voltage power driver module; Described power supply is that described wireless and passive metering circuit is powered through described multiplication of voltage power driver module and primary coil successively; Described first microcontroller realizes the communication between described wireless and passive metering circuit by the first wireless module;
Described wireless and passive metering circuit comprises: secondary coil, and couple electrical energy is entered rectification charging administration module by described secondary coil, and is stored in farad capacitor; Be that the second microcontroller and sensor assembly are powered through mu balanced circuit; Described second microcontroller detects the charging/discharging voltage of described farad capacitor in real time by voltage monitoring module, and is charged by described external control circuit; Described sensor assembly obtains the physical quantity measured, and is transferred to described external control circuit, realizes measuring the wireless and passive of physical quantity under the control of described second microcontroller by the second wireless module.
Described second microcontroller detects the charging/discharging voltage of described farad capacitor in real time by voltage monitoring module, and carries out charging by described external control circuit and be specially:
Described second microcontroller detects the charging/discharging voltage of described farad capacitor in real time by described voltage monitoring module, when the charging voltage of described farad capacitor higher than the first preset value or sparking voltage lower than the second preset value time, described second microcontroller sends control information to described first wireless module by described second wireless module, and described control information is transferred to the first microcontroller by described first wireless module; Described first microcontroller stops the charging of described farad capacitor by controlling described multiplication of voltage power driver module or charges.
Described multiplication of voltage power driver module adopts the H-bridge drive circuit of full-bridge, and the impulse level that described first microcontroller exports is converted to high-tension impulse level.
The H-bridge drive circuit of described full-bridge selects the metal-oxide-semiconductor of four N-types.
Described mu balanced circuit comprises: change-over circuit pulse signal being converted to voltage signal,
Voltage signal is transferred to voltage feedback module by described change-over circuit, and the positive ends of described voltage feedback module connects reference voltage by controlled single-pole double-throw switch (SPDT); The dividing potential drop of voltage after the voltage stabilizing of negative polarity termination Buck-Boost circuit; The output termination PWM driver module of described voltage feedback module, described PWM driver module exports the pulse waveform of certain frequency and dutycycle and is added on described Buck-Boost circuit, the voltage of described Buck-Boost circuit stable output.
Described controlled single-pole double-throw switch (SPDT) connects reference voltage and is specially:
Described controlled single-pole double-throw switch (SPDT) meets fixed reference potential VREF, or,
Described controlled single-pole double-throw switch (SPDT) connects the pulse waveform that described second microcontroller exports.
Described first microcontroller and the second microcontroller are low-power consumption microcontroller.
Described first microcontroller and the second microcontroller are CC430 series, are integrated with radio frequency transceiving module.
When described sensor assembly exports as simulating signal, then by amplifying or be directly inputted to after following the AD conversion interface of described second microcontroller; If described sensor assembly exports as digital signal, then read the output signal of described sensor assembly by the I/O interface of described second microcontroller.
The beneficial effect of technical scheme provided by the invention is:
1) by adopting farad capacitor thus solving electromagnetic wave in charging process to cause interference problem to wireless module, namely can suspend data transmit-receive in charging process and after charging process completes, continue the transmitting-receiving process of data again; Repeatedly can charge due to farad capacitor simultaneously and not affect the ability of its discharge and recharge, thus increasing wireless and passive measurement mechanism serviceable life and applicability;
2) wire cannot be used to carry out the occasion of Energy Transfer and signal-obtaining by adopting external control circuit and wireless and passive metering circuit two parts to make it be applied in some; And when making real work by the design of sensor assembly and the second microcontroller, the physical quantity of multiple analog or digital can be measured;
3) when multiplication of voltage power driver module adopts the H-bridge drive circuit of full-bridge, improve the efficiency of Energy Transfer, shorten the duration of charging, the interference that when reducing charging, high-frequency electromagnetic signal causes; And when the metal-oxide-semiconductor of four N-types selected, further increase the efficiency of circuit;
4) when adopting mu balanced circuit provided by the invention, the stable power-supplying to sensor assembly and the second microcontroller is achieved; When controlled single-pole double-throw switch (SPDT) inputs the pulse waveform of the second microcontroller output, expand the output area of voltage, thus can better for sensor assembly provides stable operating voltage.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of wireless and passive measurement mechanism;
Fig. 2 is the circuit diagram of multiplication of voltage power driver module;
Fig. 3 is the circuit diagram of rectification charging administration module;
Fig. 4 is the circuit diagram of voltage stabilizing circuit module.
In accompanying drawing, the list of parts representated by each label is as follows:
1: power supply; 2: the first microcontrollers;
3: multiplication of voltage power driver module; 4: the first wireless modules;
5: primary coil; 6: secondary coil;
7: rectification charging administration module; 8: farad capacitor;
9: mu balanced circuit; 10: the second wireless modules;
11: the second microcontrollers; 12: sensor assembly;
13: voltage monitoring module; 14: full-bridge diode rectifier circuit;
15: stabilivolt; 16:Buck-Boost circuit;
17:PWM driver module; 18: voltage feedback module;
19: change-over circuit; 20: controlled single-pole double-throw switch (SPDT).
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Farad capacitor is a kind of novel energy storage device grown up the 1970s and 1980s in last century, have the many merits such as power density is high, the discharge and recharge time is short, have extended cycle life, operating temperature range is wide, environmental protection is pollution-free, its application can improve range of application and the service time of wireless and passive measuring equipment further.
In order to solve owing to connecting wire to the restriction of range of application; Simultaneously can the multiple physical quantity of test constantly give concrete energy source and the implementation of energy conversion, see Fig. 1 and Fig. 2, a kind of wireless and passive measurement mechanism, comprising: external control circuit and wireless and passive metering circuit,
External control circuit comprises: the first microcontroller 2, first microcontroller 2 controls the input of power supply 1 by multiplication of voltage power driver module 3; Power supply 1 successively through multiplication of voltage power driver module 3 and primary coil 5 for wireless and passive metering circuit is powered; First microcontroller 2 realizes the communication between wireless and passive metering circuit by the first wireless module 4;
Wireless and passive metering circuit comprises: secondary coil 6, and couple electrical energy is entered rectification charging administration module 7 by secondary coil 6, and is stored in farad capacitor 8; Be that the second microcontroller 11 and sensor assembly 12 are powered through mu balanced circuit 9; Second microcontroller 11 draws the charging/discharging voltage of electric capacity 8 by voltage monitoring module 13 real-time detection method, and is charged by external control circuit; Sensor assembly 12 obtains the physical quantity measured, and is transferred to external control circuit, realizes measuring the wireless and passive of physical quantity under the control of the second microcontroller 11 by the second wireless module 10.
Wherein, the second microcontroller 11 draws the charging/discharging voltage of electric capacity 8 by voltage monitoring module 13 real-time detection method, and carries out charging by external control circuit and be specially:
Second microcontroller 11 draws the charging/discharging voltage of electric capacity 8 by voltage monitoring module 13 real-time detection method, when the charging voltage of farad capacitor 8 higher than the first preset value or sparking voltage lower than the second preset value time, second microcontroller 11 sends control information to the first wireless module 4, first wireless module 4 by the second wireless module 10 and control information is transferred to the first microcontroller 2; First microcontroller 2 stops the charging of farad capacitor 8 by controlling multiplication of voltage power driver module 3 or charges.
During specific implementation, the first preset value and the second preset value set according to the needs in practical application, and during specific implementation, the embodiment of the present invention does not limit this.
Wherein, external control circuit produces the high-frequency pulse signal of certain amplitude by multiplication of voltage power driver module 3 and produces high-frequency resonance electromagnetic field by primary coil 5, this high-frequency resonance electromagnetic field couples is its power supply to wireless and passive metering circuit, constitutes loosely coupled transformer between primary coil 5 and secondary coil 6.
See Fig. 2, what multiplication of voltage power driver module 3 adopted is the H-bridge drive circuit of full-bridge, thus the impulse level that the first microcontroller 2 exports is converted to high-tension impulse level, to improve efficiency, the shortening duration of charging of Energy Transfer, the interference that when reducing to charge, high-frequency electromagnetic signal causes.
Simultaneously, in order to reduce quiescent current during metal-oxide-semiconductor work, reduce overall power, the metal-oxide-semiconductor of four N-types that what the H-bridge drive circuit of full-bridge was selected is, at any time, always having a pair metal-oxide-semiconductor to be in pressure drop is zero (" conducting "), and a pair metal-oxide-semiconductor is in the state that electric current is zero (" shutoff "), in theory can not off-energy, thus substantially increase the efficiency of circuit.
See Fig. 3, rectification charging administration module 7 is made up of full-bridge diode rectifier circuit 14 and stabilivolt 15, and the AC rectification that secondary coil 6 is coupled by full-bridge diode rectifier circuit 14 is direct current; Stabilivolt 15 pairs of direct currents carry out voltage stabilizing, prevent that DC voltage is excessive to be exceeded the rated voltage upper limit of farad capacitor 8 and damage farad capacitor 8.
See Fig. 4, the input voltage of mu balanced circuit 9 is the output voltage of farad capacitor 8, according to the discharge curve of farad capacitor 8, the input voltage of mu balanced circuit 9 is not a burning voltage and likely lower than the second microcontroller 11 and sensor assembly 12 voltage normally needed for work.
In order to stable power supply can be provided for the second microcontroller 11 and sensor assembly 12, mu balanced circuit 9 comprises: the change-over circuit 19 pulse signal being converted to voltage signal, voltage signal is transferred to voltage feedback module 18 by change-over circuit 19, and the positive ends of voltage feedback module 18 connects reference voltage by controlled single-pole double-throw switch (SPDT) 20; The voltage stabilizing of negative polarity termination Buck-Boost(buck) dividing potential drop of voltage after circuit 16 voltage stabilizing; The output termination PWM(pulse-length modulation of voltage feedback module 18) driver module, PWM driver module exports the pulse waveform of certain frequency and dutycycle and is added on Buck-Boost circuit 16, the voltage of Buck-Boost circuit 16 stable output.
Wherein, controlled single-pole double-throw switch (SPDT) 20 connects reference voltage and is specially: controlled single-pole double-throw switch (SPDT) 20 meets fixed reference potential VREF, or, connect the pulse waveform that the second microcontroller 11 exports.
During practical application, controlled single-pole double-throw switch (SPDT) 20 acquiescence closes holds in reference voltage VREF, but can select to be closed to VIO end by the second microcontroller 11, the pulse waveform that VIO holds input second microcontroller 11 to export, voltage signal can be converted to by change-over circuit 19 and then export by voltage feedback module 18 control PWM driver module 17 voltage that certain waveform makes Buck-Boost circuit 16 stable output, like this while guarantee is the second microcontroller 11 power supply, better power supply is carried out to sensor assembly, has expanded the scope of output voltage.
In order to reduce the power consumption of device, the first microcontroller 2 and the second microcontroller 11 are preferably low-power consumption microcontroller.
When the model of the first microcontroller 2 and the second microcontroller 11 is CC430 series, 1) modules in microcontroller can be chosen as to power, well achieve the object of low-power consumption; 2) because the low-power consumption microcontroller of CC430 series has larger flash storage space, therefore the data measured by wireless and passive testing circuit temporarily can be stored in inner flash, thus can select not power to CC1101 wireless radio frequency modules by software within the longer time, and power again after storing a given data and transmit data, namely shorten the power-on time of wireless radio frequency modules, reduce overall power; 3) the first microcontroller 2 and the second microcontroller 11 are integrated with radio frequency transceiving module, without the need to separately establishing the first wireless module 4 and the second wireless module 10, provide cost savings.Such as: the first microcontroller 2 and the second microcontroller 11 CC430F5137 preferably in CC430 series super low power consuming single chip processor, it carries DA and AD conversion module; Inside is integrated with CC1101 wireless radio frequency modules.
To power owing to there being stable power supply 1 and wireless and passive testing circuit has the second microcontroller 11, sensor assembly 12 can for measuring the electric sensor of any physical quantity, if the output of sensor assembly 12 is simulating signal, can by the AD conversion interface that amplifies or be directly inputted to the first microcontroller 11 after following from but the measurement realized physical quantity; If the output of sensor assembly 12 is digital signal, then by the output signal of the digital I/O port read sensor module 12 of the second microcontroller 11 and then the function of realization measurement.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a wireless and passive measurement mechanism, comprising: external control circuit and wireless and passive metering circuit, is characterized in that,
Described external control circuit comprises: the first microcontroller, and described first microcontroller controls the input of power supply by multiplication of voltage power driver module; Described power supply is that described wireless and passive metering circuit is powered through described multiplication of voltage power driver module and primary coil successively; Described first microcontroller realizes the communication between described wireless and passive metering circuit by the first wireless module;
Described wireless and passive metering circuit comprises: secondary coil, and couple electrical energy is entered rectification charging administration module by described secondary coil, and is stored in farad capacitor; Be that the second microcontroller and sensor assembly are powered through mu balanced circuit; Described second microcontroller detects the charging/discharging voltage of described farad capacitor in real time by voltage monitoring module, and is charged by described external control circuit; Described sensor assembly obtains the physical quantity measured, and is transferred to described external control circuit, realizes measuring the wireless and passive of physical quantity under the control of described second microcontroller by the second wireless module;
Wherein, described mu balanced circuit comprises: change-over circuit pulse signal being converted to voltage signal,
Voltage signal is transferred to voltage feedback module by described change-over circuit, and the positive ends of described voltage feedback module connects reference voltage by controlled single-pole double-throw switch (SPDT); The dividing potential drop of voltage after the voltage stabilizing of negative polarity termination Buck-Boost circuit; The output termination PWM driver module of described voltage feedback module, described PWM driver module exports the pulse waveform of certain frequency and dutycycle and is added on described Buck-Boost circuit, controls the voltage of described Buck-Boost circuit stable output.
2. a kind of wireless and passive measurement mechanism according to claim 1, is characterized in that, described second microcontroller detects the charging/discharging voltage of described farad capacitor in real time by voltage monitoring module, and carries out charging by described external control circuit and be specially:
Described second microcontroller detects the charging/discharging voltage of described farad capacitor in real time by described voltage monitoring module, when the charging voltage of described farad capacitor higher than the first preset value or sparking voltage lower than the second preset value time, described second microcontroller sends control information to described first wireless module by described second wireless module, and described control information is transferred to the first microcontroller by described first wireless module; Described first microcontroller stops the charging of described farad capacitor by controlling described multiplication of voltage power driver module or charges.
3. a kind of wireless and passive measurement mechanism according to claim 1, is characterized in that, described multiplication of voltage power driver module adopts the H-bridge drive circuit of full-bridge, and the impulse level that described first microcontroller exports is converted to high-tension impulse level.
4. a kind of wireless and passive measurement mechanism according to claim 3, is characterized in that, the H-bridge drive circuit of described full-bridge selects the metal-oxide-semiconductor of four N-types.
5. a kind of wireless and passive measurement mechanism according to claim 1, is characterized in that, described controlled single-pole double-throw switch (SPDT) connects reference voltage and is specially:
Described controlled single-pole double-throw switch (SPDT) meets fixed reference potential VREF, or,
Described controlled single-pole double-throw switch (SPDT) connects the pulse waveform that described second microcontroller exports.
6. a kind of wireless and passive measurement mechanism according to claim 1 and 2, is characterized in that, described first microcontroller and the second microcontroller are low-power consumption microcontroller.
7. a kind of wireless and passive measurement mechanism according to claim 1 and 2, is characterized in that, described first microcontroller and the second microcontroller are CC430 series, are integrated with radio frequency transceiving module.
8. a kind of wireless and passive measurement mechanism according to claim 1 and 2, is characterized in that, when described sensor assembly exports as simulating signal, then by amplifying or be directly inputted to after following the AD conversion interface of described second microcontroller; If described sensor assembly exports as digital signal, then read the output signal of described sensor assembly by the I/O port of described second microcontroller.
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| CN201210412964.8A CN102944259B (en) | 2012-10-25 | 2012-10-25 | Wireless passive measuring device |
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| CN201210412964.8A CN102944259B (en) | 2012-10-25 | 2012-10-25 | Wireless passive measuring device |
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| CN102944259A CN102944259A (en) | 2013-02-27 |
| CN102944259B true CN102944259B (en) | 2015-05-20 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105730600A (en) * | 2016-03-28 | 2016-07-06 | 苏州德佳物联科技有限公司 | Moment detecting system and motor control system |
| 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 |
| CN107658954B (en) * | 2017-10-26 | 2024-06-11 | 国网江苏省电力公司南京供电公司 | DC operation power supply monitoring and charging device for vehicle-mounted generator set |
| WO2019161525A1 (en) * | 2018-02-22 | 2019-08-29 | 廖淑辉 | Tiny signal detection device and method |
| CN108469554A (en) * | 2018-03-20 | 2018-08-31 | 钱柏霖 | A kind of passive closed environment index detection system and method |
| CN108444502B (en) * | 2018-03-28 | 2020-01-24 | 武汉大学 | Sensor measuring method based on wireless power transmission |
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