CN105698974A

CN105698974A - Stress monitoring device capable of realizing self power supply through collecting wireless energy

Info

Publication number: CN105698974A
Application number: CN201610025007.8A
Authority: CN
Inventors: 厉熙宇; 王洁; 高庆华; 冯雪艳; 喻言
Original assignee: Dalian University of Technology
Current assignee: Dalian University of Technology
Priority date: 2016-01-15
Filing date: 2016-01-15
Publication date: 2016-06-22
Anticipated expiration: 2036-01-15
Also published as: CN105698974B

Abstract

The invention belongs to the information technology field, relates to a stress monitoring device capable of realizing self power supply through collecting wireless energy and discloses the stress monitoring device which does not need a power supply to provide power, collects surrounding radio signals and converts into power supply energy and can work for a long time. The device adopts a capacitor, an inductor, a zero pressure drop schottky diode, a charge pump and the like to realize conversion from wireless signal energy to direct current energy, adopts an intelligent scheduling strategy to realize control of charge and discharge and adopts a rapid acquisition and storage strategy to realize low power consumption and rapid stress data acquisition and storage. The device does not need any power supply, can work in an area where the wireless signal covers, is convenient to install and can work for a long time. And the device has a good application prospect in fields of bridge monitoring, tunnel monitoring and the like.

Description

One realizes self-powered monitor for stress by collecting wireless energy

Technical field

The present invention relates to one and realize self-powered monitor for stress by collecting wireless energy, belong to areas of information technology。This device a kind of that power without power supply, by the radio signal collected around and be converted into power supply energy, the monitor for stress that can work long hours。

Background technology

Stress measurement has a wide range of applications in various fields such as bridge monitoring, monitoring mining, monitoring structural health conditions。Based on the stress data measured, it is possible to the health status of structure is estimated, thus the generation of the accident that averts a calamity。

At present, monitor for stress many employings external power supply of comparative maturity is powered or selects high capacity cell to power, in a lot of application scenarios, such as: bridge monitoring, tunnel monitoring etc., it is difficult to obtain external power supply, simultaneously, adopt battery to power and there is running down of battery problem, it is necessary to often change battery。Therefore, people are exploring a kind of can change battery, work long hours, convenient monitor for stress laid always。

Research worker attempts the energy utilizing vibration to produce, and vibrational energy is converted into electric energy, devises the self-powered type monitor for stress based on vibrating power-generation。Related work, such as " patent of invention CN201310677175.1 is based on the self-powered type wireless tunnel health monitoring device of vibrating power-generation ", this device utilizes multidirectional device for collecting piezoelectric vibration energy to collect the vibrational energy of all directions, and it being translated into the power supply that the sensor that electric energy is monitoring provides lasting, the construction cost that this installation cost compares to the human cost changing battery or laying electric wire is comparatively cheap。But, vibration is not ubiquitous, and a lot of application scenarios do not have lasting vibration signal。More pervasive method how is utilized to realize sensor self-powered having important researching value and application prospect。

Summary of the invention

It is an object of the invention to overcome the defect of prior art, invention provides one and realizes self-powered monitor for stress by collecting wireless energy, the energy of place wireless signal can be converted into DC energy by this device efficiently, and then power for stress Acquisition Circuit, it is achieved the collection of counter stress。Compared with prior art scheme, the present invention adopts electric capacity, inductance, zero pressure drop Schottky diode, electric charge pump etc. to realize the wireless energy signal conversion to DC energy so that monitor for stress can long-time non-stop run in the region that wireless signal covers。

A kind of realize self-powered monitor for stress by collection wireless energy, be made up of omnidirectional antenna, π type impedance matching circuit, booster circuit, electric charge pump, power switch, low-power consumption micro-processor interface circuit, parallel interface analog-digital converter, ferroelectric memory and the control software design that operates on micro-processor interface circuit；All circuit components of this device all adopt extra low voltage, ultralow Consumption, and meanwhile, electric capacity all adopts the electric capacity of ultra-low equivalent series resistance, ultralow leakage current, and diode all adopts zero pressure drop Schottky diode；This device realizes the automatic switchover in charging with work two states based on intelligent scheduling strategy。

π type impedance matching circuit is made up of two electric capacity and an inductance, it is achieved by the antenna impedance conversion to booster circuit impedance, it is achieved the maximum transmitted of energy；

Booster circuit is made up of multiple zero pressure drop Schottky diodes and multiple electric capacity, by the one-way conduction effect of zero pressure drop Schottky diode, it is achieved the lasting charging to each electric capacity, makes the output voltage of booster circuit continue to raise；

Electric charge pump realizes the further lifting to DC voltage, charges for load large bulk capacitance, thus storing enough electric charges for stress Acquisition Circuit；

Power switch is off at charge mode, in the conduction state in mode of operation, it is ensured that during charging, stress Acquisition Circuit does not consume electric energy；

Low-power consumption micro-processor interface circuit adopts extra low voltage to power, have extremely low energy expenditure, running control software on it, it is achieved the control to parallel interface analog-digital converter, gathers stress data, and stores in ferroelectric memory；

Parallel interface analog-digital converter adopts parallel interface to be connected with low-power consumption micro-processor interface circuit, ensures the quick transmission of data；

Ferroelectric memory adopts parallel interface to be connected with low-power consumption micro-processor interface circuit, ensures the quick transmission of data, meanwhile, ensures that data power down is not lost；

Operate in control software design on micro-processor interface circuit realize gathering, the scheduling of storing process and control；

This device adopts electric capacity, inductance, zero pressure drop Schottky diode, electric charge pump etc. to realize the wireless energy signal conversion to DC energy, adopt intelligent scheduling strategy to realize the control of discharge and recharge, adopt Quick Acquisition storage strategy to realize low-power consumption, quick stress data acquisition and storage；

Wireless energy signal is as follows to the transformation process of DC energy:

1) first wireless signal is received by omnidirectional antenna, afterwards, sends into booster circuit by the π type impedance matching circuit being made up of electric capacity, inductance；

2) booster circuit is made up of multiple electric capacity and zero pressure drop Schottky diode, it is achieved the accumulation of electric charge and the lifting of voltage；

3) voltage after lifting sends into electric charge pump, realizes the lifting of voltage and the accumulation of electric charge further, and the electric charge of collection is stored in a large bulk capacitance by electric charge pump。

The workflow of intelligent scheduling strategy is as follows:

1) wireless energy signal is constantly converted into DC energy and stores in large bulk capacitance, and now, the power switch for connecting energy collection circuit and stress Acquisition Circuit is closed, the not power consumption of whole device；

2) when the voltage of large bulk capacitance is more than HVT high voltage threshold V_hTime, power switch turns on, and stress Acquisition Circuit works on power, and device enters mode of operation, and low power processor controls analog to digital conversion circuit and carries out stress collection, and result is stored in ferroelectric memory；

3) owing to stress Acquisition Circuit works on power, large bulk capacitance discharges rapidly, when its voltage is less than low pressure threshold V_lTime, power switch is closed, and stops powering for stress Acquisition Circuit, and device reenters charge mode；

4) device continues to repeat above-mentioned 2), 3) step, it is achieved moving in circles of " charging work battery charger make "。

The workflow of Quick Acquisition storage strategy is as follows:

1) all components and parts of stress Acquisition Circuit all adopt extra low voltage, ultralow Consumption；

2) microprocesser initialization parallel interface analog to digital conversion circuit stress simulation amount is converted to digital quantity；

3) digital quantity signal is stored in high speed ferroelectric nonvolatile memory by microprocessor；

4) stress Acquisition Circuit enters resting state。

The invention has the beneficial effects as follows and realize the power supply of counter stress acquisition system by collecting wireless energy, this device, without any power supply, can work in the region that wireless signal covers, easy for installation, can work long hours。Therefore, it has good application prospect in fields such as bridge monitoring, tunnel monitorings。

Accompanying drawing explanation

Fig. 1 is the system architecture diagram of apparatus of the present invention。

Fig. 2 is " charging work battery charger is made " mode of operation switching schematic diagram of apparatus of the present invention。

In figure: 1 omnidirectional antenna；2 π type impedance matching circuits；3 booster circuits；4 electric charge pumps；5 power switch；6 low-power consumption micro-processor interface circuits；7 parallel interface analog-digital converters；8 ferroelectric memorys；

Detailed description of the invention

Specific embodiment of the invention is specifically elaborated below in conjunction with technical scheme and accompanying drawing。

Embodiment adopts the system architecture diagram shown in Fig. 1。Being constructed as follows of circuit arrangement: the whip antenna that omnidirectional antenna 1 adopts gain to be 9dB, operating frequency is 880MHz to 920MHz；π type impedance matching circuit 2 is made up of two 18pF electric capacity and a 3uH inductance, it is achieved 50 ohmages are to the conversion of 16+68j complex impedance；Booster circuit 3 is made up of 6 10pF electric capacity and 6 zero pressure drop Schottky diode HSMS2852, constitutes 3 grades of voltage-multiplying circuits, it is achieved the continuous charging to electric capacity, reaches the continuous lifting to capacitance voltage；Electric charge pump 4 is by the bq25570 of Texas Instruments and large bulk capacitance, and bq25570 is responsible for realizing the charging to large bulk capacitance, it is achieved the further lifting of voltage, meanwhile, by setting the HVT high voltage threshold V of bq25570_hWith low pressure threshold V_lCan realizing the automatic switchover to device charging with duty as shown in Figure 2, large bulk capacitance must choose the electric capacity of ultra-low equivalent series resistance, ultralow leakage current, adopts the 6mF electric capacity of the BestCap series of AVX Corp. in embodiment, in embodiment, HVT high voltage threshold V_hFor 2.4V, low pressure threshold V_lFor 2V；Power switch 5 adopts the TPS22860 super low-power consumption switch chip of Texas Instruments, and leakage current during closedown only has 2nA, it is ensured that system not power consumption substantially during charging；Low-power consumption micro-processor interface circuit 6 adopts the MSP430F1232 of Texas Instruments, and when 1MHz dominant frequency, processor power consumption stream is only 1.8mA, and can work in the wide-voltage range of 1.8V 3.6V；Parallel interface analog-digital converter 7 adopts the high speed parallel interface of Linear Tech, low-power consumption, low-voltage analog-digital converter LTC2159, the minimum 1.8V of supply voltage, precision 16, speed 20M, 16 parallel-by-bit interfaces；Ferroelectric memory 8 adopts the 128K parallel interface ferroelectric memory of Cypress company, memory capacity 128K, and supply voltage is low to moderate 2V, and read-write speed is up to 33MHz, and current drain is only 120uA；Operate in the control software design 9 on micro-processor interface circuit to adopt and show a C language, it is achieved the control to low-power consumption micro-processor interface circuit 6, parallel interface analog-digital converter 7 and ferroelectric memory 8, it is achieved the collection of stress data, storage。

Test shows, when transmitter transmitting power is 1W, this monitor for stress is in the place of range transmitter 5m, and the complete cycle of " charging work " is 2.8 minutes, and wherein, the working time being used for stress acquisition tasks is only 850us。

Claims

1. realizing a self-powered monitor for stress by collection wireless energy, it is characterized in that, wireless energy signal, to the conversion of DC energy, adopts Quick Acquisition storage strategy to realize low-power consumption, quick stress data acquisition and storage；

This device is made up of omnidirectional antenna, π type impedance matching circuit, booster circuit, electric charge pump, power switch, low-power consumption micro-processor interface circuit, parallel interface analog-digital converter, ferroelectric memory and the control software design that operates on micro-processor interface circuit；All circuit components all adopt extra low voltage, super low-power consumption, and electric capacity adopts the electric capacity of ultra-low equivalent series resistance, ultralow leakage current, and diode adopts zero pressure drop Schottky diode；π type impedance matching circuit is made up of two electric capacity and an inductance, it is achieved by the antenna impedance conversion to booster circuit impedance, it is achieved the maximum transmitted of energy；Booster circuit is made up of multiple zero pressure drop Schottky diodes and multiple electric capacity, by the one-way conduction effect of zero pressure drop Schottky diode, it is achieved the lasting charging to each electric capacity, makes the output voltage of booster circuit continue to raise；Electric charge pump realizes the further lifting to DC voltage, charges for load large bulk capacitance, thus storing enough electric charges for stress Acquisition Circuit；Power switch is off at charge mode, in the conduction state in mode of operation, it is ensured that during charging, stress Acquisition Circuit does not consume electric energy；Low-power consumption micro-processor interface circuit adopts extra low voltage to power, have extremely low energy expenditure, running control software on it, it is achieved the control to parallel interface analog-digital converter, gathers stress data, and stores in ferroelectric memory；Parallel interface analog-digital converter adopts parallel interface to be connected with low-power consumption micro-processor interface circuit, ensures the quick transmission of data；Ferroelectric memory adopts parallel interface to be connected with low-power consumption micro-processor interface circuit, ensures the quick transmission of data, meanwhile, ensures that data power down is not lost；Operate in control software design on micro-processor interface circuit realize gathering, the scheduling of storing process and control。

2. the method realizing quick stress data acquisition and storage with monitor for stress described in claim 1, its feature comprises the following steps,

(1) wireless energy signal is to the conversion of DC energy, and process is as follows:

First wireless signal is received by omnidirectional antenna, and the π type impedance matching circuit by being made up of electric capacity, inductance sends into booster circuit afterwards；Booster circuit is made up of multiple electric capacity and zero pressure drop Schottky diode, it is achieved the accumulation of electric charge and the lifting of voltage；Voltage after lifting sends into electric charge pump, realizes the lifting of voltage and the accumulation of electric charge further, and the electric charge of collection is stored in a large bulk capacitance by electric charge pump；

(2) adopting intelligent scheduling strategy to realize the control of discharge and recharge, flow process is as follows:

Wireless energy signal is constantly converted into DC energy and stores in large bulk capacitance, and now, the power switch for connecting energy collection circuit and stress Acquisition Circuit is closed, the not power consumption of whole device；When the voltage of large bulk capacitance is more than HVT high voltage threshold V_hTime, power switch turns on, and stress Acquisition Circuit works on power, and device enters mode of operation, and low power processor controls analog to digital conversion circuit and carries out stress collection, and result is stored in ferroelectric memory；Owing to stress Acquisition Circuit works on power, large bulk capacitance discharges rapidly, when its voltage is less than low pressure threshold V_lTime, power switch is closed, and stops powering for stress Acquisition Circuit, and device reenters charge mode；Continue repeat the above steps, it is achieved moving in circles of " charging work battery charger being made "。

(3) quickly stress data acquisition and storage, flow process is as follows:

Stress simulation amount is also converted to digital quantity by microprocesser initialization parallel interface analog to digital conversion circuit；Digital quantity signal is stored in high speed ferroelectric nonvolatile memory by microprocessor；Stress Acquisition Circuit enters resting state。