CN102944259A - Wireless passive measuring device - Google Patents
Wireless passive measuring device Download PDFInfo
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- CN102944259A CN102944259A CN2012104129648A CN201210412964A CN102944259A CN 102944259 A CN102944259 A CN 102944259A CN 2012104129648 A CN2012104129648 A CN 2012104129648A CN 201210412964 A CN201210412964 A CN 201210412964A CN 102944259 A CN102944259 A CN 102944259A
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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 the wireless and passive field, particularly a kind of wireless and passive measurement mechanism.
Background technology
The development of modern surveying technology, so that the measurement directly perceived of a lot of physical quantitys becomes possibility, such as: pressure, temperature, humidity and flow etc.But a very large restriction is to carry out the supply of energy and reading of data by wire, and is very unfavorable for the application of some physical quantitys at inner certain position in measuring vessel inside, animal or human's body.
Chinese utility model patent " a kind of wireless and passive metering circuit " (publication number: CN201629035U, day is disclosed: the metering circuit that on November 10th, 2010) a kind of wireless and passive is provided, namely pass through the realization of controlled capacitance or inductance to the measurement of physical quantity, but the measurable physical quantity of this kind 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, open day: on September 7th, 2011) proposed a kind of prioritization scheme that wireless and passive is measured, namely show that by periodic refreshing thereby the mode of data realizes the energy-conservation working time of improving system, 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, solved owing to connect wire to using the restriction of scope; Simultaneously can a plurality of physical quantitys of test constantly and provided concrete energy source and the implementation of energy conversion, see for details hereinafter and describe:
A kind of wireless and passive measurement mechanism comprises: external control circuit and wireless and passive metering circuit,
Described external control circuit comprises: the first microcontroller, and described the first microcontroller is by the input of multiplication of voltage power driver module control power supply; Described power supply is described wireless and passive metering circuit power supply through described multiplication of voltage power driver module and primary coil successively; Described the first microcontroller is by the communication between the realization of the first wireless module and the described wireless and passive metering circuit;
Described wireless and passive metering circuit comprises: secondary coil, and described secondary coil advances the rectification charging administration module with couple electrical energy, and is stored in the farad capacitor; The process mu balanced circuit is the second microcontroller and sensor assembly power supply; Described the second microcontroller passes through the charging/discharging voltage that the voltage monitoring module detects described farad capacitor in real time, and charges by described external control circuit; Described sensor assembly obtains the physical quantity of measurement, is transferred to described external control circuit by the second wireless module under the control of described the second microcontroller, realizes the wireless and passive of physical quantity is measured.
Described the second microcontroller detects in real time the charging/discharging voltage of described farad capacitor by the voltage monitoring module, and charges by described external control circuit and to be specially:
Described the 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 is higher than the first preset value or sparking voltage and is lower than the second preset value, described the second microcontroller sends control information to described the first wireless module by described the second wireless module, and described the first wireless module transfers to the first microcontroller with described control information; Described the first microcontroller is by controlling described multiplication of voltage power driver module and stop the charging of described farad capacitor or charging.
Described multiplication of voltage power driver module adopts the H bridge driving circuit of full-bridge, and the impulse level that described the first microcontroller is exported is converted to high-tension impulse level.
The H bridge driving circuit of described full-bridge is selected the metal-oxide-semiconductor of four N-types.
Described mu balanced circuit comprises: pulse signal is converted to the change-over circuit of voltage signal,
Described change-over circuit transfers to the Voltage Feedback module with voltage signal, 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, the pulse waveform of described PWM driver module output certain frequency and dutycycle also is added on the described Buck-Boost circuit 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 of described the second microcontroller output.
Described the first microcontroller and the second microcontroller are the low-power consumption microcontroller.
Described the first microcontroller and the second microcontroller are CC430 series, are integrated with radio frequency transceiving module.
When described sensor assembly is output as simulating signal, then by amplify or follow after be directly inputted to the AD translation interface of described the second microcontroller; If described sensor assembly is output as digital signal, then read the output signal of described sensor assembly by the IO interface of described the second microcontroller.
The beneficial effect of technical scheme provided by the invention is:
1) thus by adopting farad capacitor to solve electromagnetic wave in the charging process wireless module is caused the problem of interference, namely can in charging process, suspend data transmit-receive and after charging process is finished, continue again the transmitting-receiving process of data; While can repeatedly be charged owing to farad capacitor and do not affected the ability that it discharges and recharges, thereby has increased wireless and passive measurement mechanism serviceable life and applicability;
2) can't use wire 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 the design by sensor assembly and the second microcontroller is so that during real work, can measure the physical quantity of a plurality of analog or digitals;
3) when the multiplication of voltage power driver module adopts the H bridge driving circuit of full-bridge, improved Energy Transfer efficient, shortened the duration of charging, the interference that high-frequency electromagnetic signal causes when having reduced charging; And when the metal-oxide-semiconductor of four N-types selecting, further improved the efficient of circuit;
4) when adopting mu balanced circuit provided by the invention, realized the stable power-supplying to sensor assembly and the second microcontroller; When controlled single-pole double-throw switch (SPDT) is inputted the pulse waveform of the second microcontroller output, enlarged the output area of voltage, thereby can better provide stable operating voltage for sensor assembly.
Description of drawings
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 the accompanying drawing, the list of parts of each label representative is as follows:
1: power supply; 2: the first microcontrollers;
3: the multiplication of voltage power driver module; 4: the first wireless modules;
5: primary coil; 6: secondary coil;
7: the rectification charging administration module; 8: farad capacitor;
9: mu balanced circuit; 10: the second wireless modules;
11: the second microcontrollers; 12: sensor assembly;
13: the voltage monitoring module; 14: the full-bridge diode rectifier circuit;
15: stabilivolt; The 16:Buck-Boost circuit;
The 17:PWM driver module; 18: the Voltage Feedback module;
19: change-over circuit; 20: controlled single-pole double-throw switch (SPDT).
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiment of the present invention is described further in detail below in conjunction with accompanying drawing.
Farad capacitor is a kind of novel energy storage device that grows up the 1970s and 1980s in last century, the many merits such as have the power density height, the time that discharges and recharges lacks, have extended cycle life, operating temperature range is wide, environmental protection is pollution-free, its application can further improve range of application and the service time of wireless and passive measuring equipment.
In order to solve owing to connecting wire to using the restriction of scope; Simultaneously can a plurality of physical quantitys of test constantly and provided concrete energy source and the implementation of energy conversion, referring to Fig. 1 and Fig. 2, a kind of wireless and passive measurement mechanism comprises: external control circuit and wireless and passive metering circuit,
External control circuit comprises: the first microcontroller 2, the first microcontrollers 2 are by the input of multiplication of voltage power driver module 3 control power supplys 1; Power supply 1 is the power supply of wireless and passive metering circuit through multiplication of voltage power driver module 3 and primary coil 5 successively; The first microcontroller 2 is by the communication between 4 realizations of the first wireless module and the wireless and passive metering circuit;
The wireless and passive metering circuit comprises: secondary coil 6, and secondary coil 6 advances rectification charging administration module 7 with couple electrical energy, and is stored in the farad capacitor 8; Process mu balanced circuit 9 is the second microcontroller 11 and sensor assembly 12 power supplies; The second microcontroller 11 passes through the charging/discharging voltages that voltage monitoring module 13 detects farad capacitors 8 in real time, and charges by external control circuit; Sensor assembly 12 obtains the physical quantity of measurement, is transferred to external control circuit by the second wireless module 10 under the control of the second microcontroller 11, realizes the wireless and passive of physical quantity is measured.
Wherein, the second microcontroller 11 detects the charging/discharging voltages of farad capacitors 8 in real time by voltage monitoring module 13, and charges by external control circuit and to be specially:
The second microcontroller 11 detects the charging/discharging voltage of farad capacitor 8 in real time by voltage monitoring module 13, when the charging voltage of farad capacitor 8 is higher than the first preset value or sparking voltage and is lower than the second preset value, the second microcontroller 11 sends control information to the first wireless module 4, the first wireless modules 4 by the second wireless module 10 control information is transferred to the first microcontroller 2; The first microcontroller 2 stops the charging of farad capacitor 8 by control multiplication of voltage power driver module 3 or charges.
During specific implementation, the first preset value and the second preset value are set according to the needs in the practical application, and during specific implementation, the embodiment of the invention does not limit this.
Wherein, external control circuit produces the high-frequency pulse signal of certain amplitude and produces the high-frequency resonance electromagnetic field by primary coil 5 by multiplication of voltage power driver module 3, this high-frequency resonance electromagnetic field couples to wireless and passive metering circuit is its power supply, has consisted of loosely coupled transformer between primary coil 5 and the secondary coil 6.
Referring to Fig. 2, what multiplication of voltage power driver module 3 adopted is the H bridge driving circuit of full-bridge, thereby the impulse level of the first microcontroller 2 outputs is converted to high-tension impulse level, with efficient, the shortening duration of charging of improving Energy Transfer, the interference that high-frequency electromagnetic signal causes when reducing to charge.
Simultaneously, quiescent current when working in order to reduce metal-oxide-semiconductor, reduce overall power, what the H bridge driving circuit of full-bridge was selected is the metal-oxide-semiconductor of four N-types, at any time, always having a pair of metal-oxide-semiconductor to be in pressure drop is zero (" conducting "), and a pair of metal-oxide-semiconductor is in the state that electric current is zero (" shutoff "), in theory can off-energy, thus the efficient of circuit greatly improved.
Referring to Fig. 3, rectification charging administration module 7 is comprised of full-bridge diode rectifier circuit 14 and stabilivolt 15, and full-bridge diode rectifier circuit 14 is direct current with the AC rectification of secondary coil 6 couplings; 15 pairs of direct currents of stabilivolt carry out voltage stabilizing, prevent from that DC voltage is excessive to surpass the rated voltage upper limit of farad capacitor 8 and damage farad capacitor 8.
Referring to 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 might be lower than the second microcontroller 11 and the required voltage of sensor assembly 12 normal operations.
In order to provide stable power supply for the second microcontroller 11 and sensor assembly 12, mu balanced circuit 9 comprises: the change-over circuit 19 that pulse signal is converted to voltage signal, change-over circuit 19 transfers to Voltage Feedback module 18 with voltage signal, 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 stabilizings; The output termination PWM(pulse-length modulation of Voltage Feedback module 18) driver module, the pulse waveform of PWM driver module output certain frequency and dutycycle also is added on the Buck-Boost circuit 16 voltage of Buck-Boost circuit 16 stable outputs.
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 is exported.
During practical application, controlled single-pole double-throw switch (SPDT) 20 acquiescences are closed holds in reference voltage VREF, but can select to be closed to the VIO end by the second microcontroller 11, the pulse waveform of VIO end input the second microcontroller 11 outputs, can be converted to voltage signal and then export the voltage that certain waveform makes Buck-Boost circuit 16 stable outputs by Voltage Feedback module 18 control PWM driver modules 17 by change-over circuit 19, like this when guaranteeing to be 11 power supplies of the second microcontroller, sensor assembly is carried out better power supply, enlarged 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 the low-power consumption microcontroller.
When the model of the first microcontroller 2 and the second microcontroller 11 is CC430 series, 1) can be chosen as modules power supply in the microcontroller, well realized the purpose of low-power consumption; 2) because the low-power consumption microcontroller of CC430 series has larger flash storage space, therefore data that can the wireless and passive testing circuit is measured temporarily are stored among the inner flash, thereby can within the long time, select not to the power supply of CC1101 wireless radio frequency modules by software, and after having stored a given data, power again and the transmission of 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, need not to establish in addition the first wireless module 4 and the second wireless module 10, provide cost savings.For example: the CC430F5137 in the first microcontroller 2 and the second microcontroller 11 preferred CC430 series super low power consuming single chip processors, it carries DA and AD modular converter; Inside is integrated with the CC1101 wireless radio frequency modules.
Owing to have 1 power supply of stable power supply and wireless and passive testing circuit to have the second microcontroller 11, sensor assembly 12 can be for measuring the electric sensor of any physical quantity, if sensor assembly 12 be output as simulating signal then can by amplify or follow after be directly inputted on the AD translation interface of the first microcontroller 11 from but realize measurement to physical quantity; If sensor assembly 12 is output as digital signal, the function that the output signal of digital I/O port read sensor module 12 that then can be by the second microcontroller 11 and then realize is measured.
It will be appreciated by those skilled in the art that accompanying drawing is the synoptic diagram of a preferred embodiment, the invention described above embodiment sequence number does not represent the quality of embodiment just to description.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. wireless and passive measurement mechanism comprises: external control circuit and wireless and passive metering circuit, it is characterized in that,
Described external control circuit comprises: the first microcontroller, and described the first microcontroller is by the input of multiplication of voltage power driver module control power supply; Described power supply is described wireless and passive metering circuit power supply through described multiplication of voltage power driver module and primary coil successively; Described the first microcontroller is by the communication between the realization of the first wireless module and the described wireless and passive metering circuit;
Described wireless and passive metering circuit comprises: secondary coil, and described secondary coil advances the rectification charging administration module with couple electrical energy, and is stored in the farad capacitor; The process mu balanced circuit is the second microcontroller and sensor assembly power supply; Described the second microcontroller passes through the charging/discharging voltage that the voltage monitoring module detects described farad capacitor in real time, and charges by described external control circuit; Described sensor assembly obtains the physical quantity of measurement, is transferred to described external control circuit by the second wireless module under the control of described the second microcontroller, realizes the wireless and passive of physical quantity is measured.
2. a kind of wireless and passive measurement mechanism according to claim 1 is characterized in that, described the second microcontroller detects in real time the charging/discharging voltage of described farad capacitor by the voltage monitoring module, and charges by described external control circuit and to be specially:
Described the 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 is higher than the first preset value or sparking voltage and is lower than the second preset value, described the second microcontroller sends control information to described the first wireless module by described the second wireless module, and described the first wireless module transfers to the first microcontroller with described control information; Described the first microcontroller is by controlling described multiplication of voltage power driver module and stop the charging of described farad capacitor or charging.
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 driving circuit of full-bridge, and the impulse level that described the first microcontroller is exported 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 driving circuit of described full-bridge is selected 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 mu balanced circuit comprises: pulse signal is converted to the change-over circuit of voltage signal,
Described change-over circuit transfers to the Voltage Feedback module with voltage signal, 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, the pulse waveform of described PWM driver module output certain frequency and dutycycle also is added on the described Buck-Boost circuit, controls the voltage of described Buck-Boost circuit stable output.
6. a kind of wireless and passive measurement mechanism according to claim 5 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 of described the second microcontroller output.
7. a kind of wireless and passive measurement mechanism according to claim 1 and 2 is characterized in that, described the first microcontroller and the second microcontroller are the low-power consumption microcontroller.
8. a kind of wireless and passive measurement mechanism according to claim 1 and 2 is characterized in that, described the first microcontroller and the second microcontroller are CC430 series, are integrated with radio frequency transceiving module.
9. a kind of wireless and passive measurement mechanism according to claim 1 and 2 is characterized in that, when described sensor assembly is output as simulating signal, then by amplify or follow after be directly inputted to the AD translation interface of described the second microcontroller; If described sensor assembly is output as digital signal, then read the output signal of described sensor assembly by the IO mouth of described the 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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| 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 |
| 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 |
| CN108469554A (en) * | 2018-03-20 | 2018-08-31 | 钱柏霖 | A kind of passive closed environment index detection system and method |
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