CN108683273B - Electromagnetic wave conversion power supply module - Google Patents
Electromagnetic wave conversion power supply module Download PDFInfo
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- CN108683273B CN108683273B CN201810561558.5A CN201810561558A CN108683273B CN 108683273 B CN108683273 B CN 108683273B CN 201810561558 A CN201810561558 A CN 201810561558A CN 108683273 B CN108683273 B CN 108683273B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
Abstract
The invention discloses an electromagnetic wave conversion power supply module suitable for long-term low-frequency monitoring of geotechnical engineering. And performing secondary energy conversion and storage on the electromagnetic waves in the surrounding environment. The invention realizes the energy conversion and storage of the electromagnetic waves by utilizing the electromagnetic waves in the surrounding environment, realizes a self-powered mode without a power supply, does not need maintenance, and is suitable for a long-term low-frequency monitoring device.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering monitoring, in particular to an electromagnetic wave conversion power supply module which is suitable for low-frequency monitoring occasions without external power supply in geotechnical engineering.
Background
As a new monitoring technology, the wireless sensor network technology solves the problems of inconvenient field wiring and the like to a great extent, but wireless sensor network nodes generally adopt batteries for power supply, the batteries are frequently required to be replaced at regular time for long-term monitoring projects, the batteries are often difficult to replace in projects due to environmental reasons such as the position of a test point, and the waterproof performance of test equipment is reduced due to replacement of the batteries.
Many geotechnical engineering monitoring projects have the characteristics that monitoring cycle is long, monitoring frequency is low, and the cycle can be as long as several years, and the frequency can be as low as several times a day or even once for several days, in order to realize the long-term effectual work of whole sensing network, need provide suitable power supply for wireless sensing network node, can adopt the energy conversion of other forms in the environment to the electric energy in proper mode, and most common is with solar energy conversion electric energy. However, the environment of some geotechnical engineering long-term monitoring projects is severe, and the solar cell panel is easy to damage and difficult to use and maintain.
Disclosure of Invention
The present invention is directed to solve the above problems in the prior art, and an object of the present invention is to provide an electromagnetic wave conversion power supply module, which can collect, convert, store, and accumulate electromagnetic wave energy in the surrounding environment, thereby realizing efficient autonomous power supply. The module adopts a two-stage energy storage mode, energy is efficiently collected and stored, meanwhile, the module adopts an interval power supply control mechanism, stored electric energy is optimally utilized, and when the stored energy is insufficient for a rear-stage monitoring device to complete a detection task, power supply to the rear-stage device is automatically cut off, possible energy loss is avoided, and when the stored energy reaches the state that the rear-stage monitoring device can complete a detection task, the module is automatically connected with the rear-stage device for power supply. The method is suitable for low-frequency monitoring scenes in geotechnical engineering, avoids inconvenience caused by subsequent maintenance due to power supply of the sensor network battery, and improves the life cycle and convenience of the wireless sensor network node.
An electromagnetic wave conversion power supply module comprises an electromagnetic wave collection module E, a secondary energy storage capacitor CS and a power supply interval control module VT,
the electromagnetic wave collection module E comprises an electromagnetic wave receiving antenna RA, an energy conversion component EC, a primary energy storage capacitor CP and a boosting component VB which are connected in sequence, the boosting component VB is connected with the input end of a secondary energy storage capacitor CS,
the electromagnetic wave receiving antenna RA inputs the received electromagnetic wave energy to the energy conversion component EC, the energy conversion component EC converts the received electromagnetic wave energy into weak direct current voltage, the primary energy storage capacitor EC is charged, and after the voltage value of the primary energy storage capacitor EC reaches the threshold value of the voltage boosting component VB, the voltage boosting component VB boosts the voltage of the primary energy storage capacitor EC into higher output voltage to charge the secondary energy storage capacitor CS.
The working voltage of the voltage boosting component VB is as low as possible, so that weak direct current voltage output by the energy conversion component EC can be boosted by the voltage boosting component VB when the electromagnetic wave intensity is weak, and the charging time of the secondary energy storage capacitor CS is shortened.
The secondary energy storage capacitor CS is a large-capacity capacitor and is used for storing the electric energy output by the electromagnetic wave collection module E.
The energy is stored in a two-stage mode, so that the loss of weak direct current voltage output by the energy conversion component EC due to the fact that the weak direct current voltage does not reach the voltage range convertible by the voltage boosting component VB can be avoided, and efficient energy collection and storage are achieved.
The power supply interval control module VT comprises a lower limit conducting part U1, an upper limit conducting part U2, a field effect tube Q, an interval switch control part U3, a pull-up resistor R, a first diode D1 and a second diode D2,
the input end of the lower limit conducting component U1 is the input end of the power supply interval control module VT, the input end of the lower limit conducting component U1 is connected with the output end of the secondary energy storage capacitor CS,
the output end of the lower limit conducting component U1 is respectively connected with one end of a pull-up resistor R, the S pole of a field effect tube Q and the input end of an upper limit conducting component U2,
the other end of the pull-up resistor R is respectively connected with the G pole of the field effect transistor Q and the output end of the interval switch control component U3,
the D-pole of the field effect transistor Q is connected to the anode of a first diode D1,
the input terminal of the upper limit turn-on block U2 is connected to the anode of the second diode D2,
the input end of the interval switch control unit U3, the cathode of the first diode D1 and the cathode of the second diode D2 are connected to form the output end of the power supply interval control module VT,
the turn-on voltage V1 of the lower limit turn-on component U1 is less than the turn-on voltage V2 of the upper limit turn-on component U2,
when the voltage at the input end of the interval switch control part U3 is less than or equal to the working voltage threshold value, the output end of the interval switch control part U3 is in a high-impedance state;
when the voltage of the input end of the interval switch control component U3 is greater than the working voltage threshold value and less than or equal to the switch conducting voltage threshold value V3, the output end of the interval switch control component U3 is electrically grounded,
when the voltage of the input end of the interval switch control unit U3 is greater than the switch conducting voltage threshold V3, the output end and the input end of the interval switch control unit U3 are conducted,
the switch turn-on voltage threshold V3 is equal to or greater than the turn-on voltage V2 of the upper limit turn-on block U2,
when the G electrode of the field effect transistor Q is at a high level, the S electrode and the D electrode are disconnected, and when the G electrode of the field effect transistor Q is at a low level, the S electrode and the D electrode are conducted.
The electric energy released in the process that the voltage of the secondary energy storage capacitor CS is reduced from the conduction voltage V2 to the conduction voltage V1 can be supplied to a rear-stage monitoring device connected to the output end of the power supply section control module VT to complete energy consumption in one-time starting, detection and communication processes.
Preferably, there are a plurality of electromagnetic wave collection modules E, and the electromagnetic wave receiving antenna RA in each electromagnetic wave collection module E receives electromagnetic waves of different frequency bands.
The turn-on voltage V1 of the lower limit turn-on means U1 is a lower limit voltage, and the turn-on voltage V2 of the upper limit turn-on means U2 is an upper limit voltage.
Because the device is based on a weak current convergence energy scene, the energy power collected by the electromagnetic wave collecting module E is far less than the power required by the rear-stage accessible monitoring device during working, once the monitoring device is started, the voltage value of the secondary energy storage capacitor CS is rapidly reduced, if a single threshold conducting component which is conducted above a fixed voltage threshold and is switched off below the fixed voltage threshold is used, the voltage of the secondary energy storage capacitor CS is conducted when reaching the fixed voltage threshold, the monitoring device is started, and once detection is not completed, the voltage value of the secondary energy storage capacitor CS is reduced to be less than the fixed voltage threshold to be switched off, so that the device cannot complete a basic detection task.
The power supply interval control mode based on the weak current collection energy scene is characterized in that the monitoring device starts to be stably powered after the voltage output by the secondary energy storage capacitor CS is greater than the upper limit voltage until the voltage of the secondary energy storage capacitor CS is reduced to be less than or equal to the lower limit voltage (lower limit voltage)<Upper limit voltage), the upper limit voltage and the lower limit voltage are in the operable voltage range of the rear-stage monitoring device, and the electric energy released in the process that the voltage of the secondary energy storage capacitor CS is reduced from the upper limit voltage to the lower limit voltage (0.5 × capacity value × (V2) of the secondary energy storage capacitor2-V12) Is larger than the energy consumption requirement of the subsequent monitoring device for completing one starting, detecting and communicating process.
When the voltage of the input end of the lower limit conducting component U1 is greater than the lower limit voltage, the lower limit conducting component U1 conducts. When the voltage at the input end of the upper limit conducting component U2 is greater than the upper limit voltage, the upper limit conducting component U2 is conducted, and the lower limit voltage is smaller than the upper limit voltage.
When the voltage at the input end of the power supply interval control module VT, namely the voltage of the secondary energy storage capacitor CS, exceeds the lower limit voltage and does not reach the upper limit voltage gradually from low to high, the lower limit conducting component U1 is conducted, the field effect tube Q is not conducted at the moment, the upper limit conducting component U2 is also not conducted, the input of the interval switch control component U3 is less than or equal to the working voltage threshold value, so that the output of the interval switch control component U3 is not conducted and is not grounded and is in a high-resistance state, the pull-up resistor R pulls up the G pole potential of the field effect tube Q, the disconnection state of the field effect tube Q is maintained, and. When the voltage of the input end of the power supply interval control module VT is greater than the upper limit voltage, the lower limit conducting part U1 is conducted, the upper limit conducting part U2 is also conducted, the voltage is attenuated by the second diode D2, the output voltage of the power supply interval control module VT is slightly smaller than the voltage of the input end, at this time, the input end of the interval switch control part U3 is in a state of being greater than the working voltage threshold but less than or equal to the switch conducting voltage threshold V3, so that the output end of the interval switch control part U3 is at a low level, i.e., the G pole of the fet Q is maintained at a low level, the S pole and the D pole of the fet Q are conducted to provide power for the rear stage monitoring device, since once the power supply to the rear stage monitoring device is started, a large amount of electric energy is consumed, the voltage of the input end of the power supply interval control module VT is reduced, the upper limit conducting component U2 is disconnected, the second diode D2 is turned off, the conducting state of the S level and the D level of the field effect transistor Q can still be maintained, the power supply interval control module VT is ensured to provide power output for the rear-level monitoring device, and the lower limit conducting component U1 is disconnected until the input of the power supply interval control module VT is lower than the lower limit voltage.
The invention has the advantages that: the electromagnetic wave energy conversion and storage is realized by utilizing the electromagnetic waves in the surrounding environment, when the energy storage is available for the rear-stage monitoring device to finish one-time data acquisition and transmission, the power supply interval control module is switched on, the energy storage module supplies energy to the monitoring device connected with the rear stage through the power supply interval control module, otherwise, the power supply interval module is switched off, and the self-powered mode without a power supply is realized while the stored electric energy is optimally used, so that the electromagnetic wave energy conversion and power supply module disclosed by the invention is free from maintenance and is suitable for a long-term low-frequency monitoring device.
Drawings
Fig. 1 is a schematic block diagram.
E: an electromagnetic wave collection module;
CS: a secondary energy storage capacitor;
VT: a power supply section control module;
FIG. 2 is a schematic block diagram of an electromagnetic wave collection unit E.
RA: an electromagnetic wave receiving antenna;
EC: an energy conversion member;
and (3) CP: a primary energy storage capacitor;
VB: and a pressure raising means.
Fig. 3 is a schematic block diagram of the section power supply control module VT.
U1: a lower limit conduction member;
u2: an upper limit conducting part;
q: a field effect transistor;
r: a pull-up resistor;
u3: an interval switch control part;
d1: a first diode;
d2: a second diode.
Fig. 4 is a schematic block diagram of an example.
Detailed Description
The invention will be further described with reference to the following examples and the accompanying drawings, it being emphasized that, although the invention will be described with reference to the examples, it is not intended to limit the invention to these examples, which are merely intended to illustrate the feasibility of the solution of the invention.
As shown in FIGS. 1 to 3, an electromagnetic wave conversion power supply module includes an electromagnetic wave collection module E, a secondary energy storage capacitor CS, and a power supply section control module VT,
the electromagnetic wave collection module E comprises an electromagnetic wave receiving antenna RA, an energy conversion component EC, a primary energy storage capacitor CP and a boosting component VB which are connected in sequence, the boosting component VB is connected with the input end of a secondary energy storage capacitor CS,
the power supply interval control module VT comprises a lower limit conducting part U1, an upper limit conducting part U2, a field effect tube Q, an interval switch control part U3, a pull-up resistor R, a first diode D1 and a second diode D2,
the input end of the lower limit conducting component U1 is the input end of the power supply interval control module VT, the input end of the lower limit conducting component U1 is connected with the output end of the secondary energy storage capacitor CS,
the output end of the lower limit conducting component U1 is respectively connected with one end of a pull-up resistor R, the S pole of a field effect tube Q and the input end of an upper limit conducting component U2,
the other end of the pull-up resistor R is respectively connected with the G pole of the field effect transistor Q and the output end of the interval switch control component U3,
the D-pole of the field effect transistor Q is connected to the anode of a first diode D1,
the input terminal of the upper limit turn-on block U2 is connected to the anode of the second diode D2,
the input end of the interval switch control unit U3, the cathode of the first diode D1 and the cathode of the second diode D2 are connected to form the output end of the power supply interval control module VT,
the turn-on voltage V1 of the lower limit turn-on component U1 is less than the turn-on voltage V2 of the upper limit turn-on component U2,
when the voltage at the input end of the interval switch control part U3 is less than or equal to the working voltage threshold value, the output end of the interval switch control part U3 is in a high-impedance state;
when the voltage of the input end of the interval switch control component U3 is greater than the working voltage threshold value and less than or equal to the switch conducting voltage threshold value V3, the output end of the interval switch control component U3 is electrically grounded,
when the voltage of the input end of the interval switch control unit U3 is greater than the switch conducting voltage threshold V3, the output end and the input end of the interval switch control unit U3 are conducted,
the switch turn-on voltage threshold V3 is equal to or greater than the turn-on voltage V2 of the upper limit turn-on block U2,
when the G electrode of the field effect transistor Q is at a high level, the S electrode and the D electrode are disconnected, and when the G electrode of the field effect transistor Q is at a low level, the S electrode and the D electrode are conducted.
The electric energy released in the process that the voltage of the secondary energy storage capacitor CS is reduced from the conduction voltage V2 to the conduction voltage V1 can be supplied to a rear-stage monitoring device connected to the output end of the power supply section control module VT to complete energy consumption in one-time starting, detection and communication processes.
In this embodiment:
the electromagnetic wave receiving antenna RA of the electromagnetic wave collecting module E selects a high-gain omnidirectional receiving antenna in the frequency band range of 100 MHz-6 GHz; the energy conversion part EC adopts a PCC110 electromagnetic wave energy conversion chip of powercast company, and the convertible frequency range is 100 MHz-6 GHz; the primary energy storage capacitor CP is a 2.5V/0.5F super capacitor; the boost component VB selects a PCC210 direct current boost chip of powercast company.
The electromagnetic wave receiving antenna RA converts the received electromagnetic wave energy into weak direct current voltage through the energy conversion component EC to charge the super capacitor of the primary energy storage capacitor CP, and the electric energy of the primary energy storage capacitor CP is boosted to be higher voltage through the boosting component VB to charge the secondary energy storage capacitor CS.
The energy conversion part EC is selected from an electromagnetic wave energy conversion chip PCC110 of powercast company, has a convertible frequency range of 100 MHz-6 GHz and is connected with the electromagnetic wave receiving antenna RA. The electromagnetic wave receiving antenna RA is transmitted by using a coaxial cable, the optimal impedance matching is 50 Ω, and the electromagnetic wave energy conversion chip PCC110 may be directly connected to the electromagnetic wave receiving antenna RA. The PCC110 does not need external power supply, and when the intensity of the environmental electromagnetic wave reaches-17 dBm (20uW), the received electromagnetic wave starts to be converted to output a dc voltage, and the conversion efficiency is greater than 75%.
The primary energy storage capacitor CP is a super capacitor with the voltage of 2.5V/0.5F and is used for storing the direct-current voltage signal output by the energy conversion component EC.
The boost component VB is direct current boost chip PCC210, and direct current boost chip PCC210 internal integration has the boost, monitoring, filter module, and the chip need not external power supply, but operating voltage is extremely low, when the input voltage is higher than 0.4V, can carry out boost conversion to the direct current voltage of input, and output voltage is adjustable through two external resistance, and conversion efficiency is up to 95%.
As shown in fig. 4, in the present embodiment, there are 3 electromagnetic wave collecting modules E, outputs of the 3 electromagnetic wave collecting modules E are connected in parallel and then connected to the secondary energy storage capacitor CS, in the present embodiment, the electromagnetic wave receiving antennas RA in the 3 electromagnetic wave collecting modules E respectively select omnidirectional electromagnetic wave receiving antennas with gains of 12dbi in three frequency bands of 100MHz, 35dbi in 915MHz, and 35dbi in 2.4GHz, and are connected to the energy conversion component EC by using a coaxial cable, and the electromagnetic wave receiving antennas in multiple available frequency bands are used to improve energy collecting efficiency.
The secondary energy storage capacitor CS is a 3.3V/1F super capacitor and is used for storing the direct-current voltage parallelly connected and output by the 3 electromagnetic wave collection modules E. Compared with a one-stage energy storage direct boosting mode, the two-stage energy storage mode has the greatest advantages that the power supply module can still normally operate under the condition that the electromagnetic wave intensity of the surrounding environment is weak, and the energy collection efficiency can be improved by 30% at least.
The turn-on voltage V1 of the lower limit turn-on means U1 is a lower limit voltage, and the turn-on voltage V2 of the upper limit turn-on means U2 is an upper limit voltage. The lower limit conducting component U1 is a 1.8V threshold voltage detection chip AME8550AEETA180Z, the lower limit voltage (conducting voltage V1) is V1 ═ 1.8V, the upper limit conducting component U2 is a 3.3V threshold voltage detection chip AME8550AEETA330Z, the upper limit voltage (conducting voltage V2) is V2 ═ 3.3V, the field-effect transistor Q1 is a P-MOS transistor NTS2101P, the pull-up resistor R1 is 10k, the interval switch control component U3 is a reset chip CN61CN33, the operating voltage threshold is 1.15V, the switch conducting voltage threshold V3 is 3.3V, (V2 is equal to or less than V3), the first diode D1, and the second diode D2 are low-voltage-drop diodes 1N 5819.
At the initial moment, the voltage of the secondary energy storage capacitor C6 is lower than 1.8V, the lower limit conducting component U1 of the power supply interval control module VT is turned off, the output voltage is 0, when the voltage of the secondary energy storage capacitor C6 reaches more than 1.8V and is lower than 3.3V, the lower limit conducting component U1 is turned on, the upper limit conducting component U2 is not yet turned on, the upper limit conducting component U2 outputs a low level, the voltage of the input pin of the interval switch control component U3 is 0, and the interval switch control component U3 does not work, so the P-MOS transistor Q1 is not turned on, and the output voltage is 0.
When the voltage of the secondary energy storage capacitor C6 rises to above 3.3V, the upper limit conducting component U2 is conducted, the voltage input to the input pin of the interval switch control component U3 after passing through the low-voltage-drop second diode D2 by the power supply interval control module VT is about 3.1V, the voltage does not reach the switch conducting voltage threshold V3 of the interval switch control component U3 but is higher than the working voltage threshold of the interval switch control component U3, the output end of the interval switch control component U3 is at a low level, so that the field effect transistor Q1 is conducted, the field effect transistor Q1 and the upper limit conducting component U2 are conducted simultaneously, two paths of direct current voltages are respectively short-circuited after passing through the low-voltage-drop first diode D1 and the second diode D2, and the power supply interval control module VT outputs a direct current voltage.
Because the power consumption of the rear-stage load is larger than the power of electromagnetic wave energy conversion, after the upper limit conducting component U2 is conducted, the voltage of the secondary energy storage capacitor CS begins to drop from 3.3V immediately when the U2 is conducted, the upper limit conducting component U2 is turned off, but the upper limit conducting component U2 has gate-level delay and is turned off after 200-400 ms of delay, the interval switch control component U3 can work normally and output low level in the period of time, the field effect transistor Q1 is conducted, so that a power supply channel output by the low-voltage-drop first diode D1 is maintained, and the phenomenon of instant power failure is avoided.
When the voltage of the secondary energy storage capacitor CS is reduced to be lower than 1.8V, the lower limit conducting component U1 is turned off, and the whole monitoring device is powered off.
The present example adopts a parallel mode of three electromagnetic wave collection modules E (a first electromagnetic wave collection module E1, a second electromagnetic wave collection module E2, and a third electromagnetic wave collection module E3) to increase the efficiency of energy collection, each electromagnetic wave collection module E converts electromagnetic waves of different frequency bands according to an electromagnetic wave Friis propagation formula
(where Pr is the received rf power, Pt is the transmitted rf power, Gt is the transmit antenna gain, Gr is the receive antenna gain, λ is the rf signal wavelength, r is the distance from the rf signal transmission point to the reception point), 1, for a 2.4G frequency band: a 4G base station with 20W of urban output power has a wavelength lambda of 0.125m corresponding to a frequency band, a 35dBi gain radio frequency signal receiving antenna is selected at a position 300m away from the base station, and the radio frequency power which can be theoretically received by an energy conversion chip PCC110 is 0.123 mW; 2. for the 900M band: the GSM900 base station with 20W of urban output power has a wavelength lambda of 0.328m corresponding to the frequency band and is located at a distance from the GSM900 base stationAt the position of 300m, a 35dBi gain radio frequency signal receiving antenna is selected, and the radio frequency power which can be received by the energy conversion chip PCC110 theoretically is 0.478 mW; 3. for the 100M band: the coverage area of a frequency modulation broadcasting station with the transmitting power of 10KW is about 70-100 Km, an omnidirectional antenna with the gain of 6dbi is selected at the position 10Km away from the frequency modulation broadcasting station, and the electromagnetic wave energy of 0.023mW can be theoretically received.
Assuming that the power supply module rear-stage monitoring device has the maximum load power consumption of 33mW and the low-power consumption mode power consumption of 5uW, and completes the system starting, detection and data communication processes for 3s, the electromagnetic wave conversion power supply module can collect energy for the rear-stage monitoring device to normally work once within several minutes to several hours, and can completely meet the low-frequency monitoring requirements of geotechnical engineering for several times a day and even several days once a day.
The above disclosure is only for the preferred embodiments of the present invention, but the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are intended to be covered by the protection scope of the present invention. Therefore, the scope of the invention should be determined by the appended claims and all changes that can be made without departing from the principles of the invention.
Claims (2)
1. An electromagnetic wave conversion power supply module comprising an electromagnetic wave collection module (E), characterized by further comprising: a secondary energy storage Capacitor (CS) and a power supply interval control module (VT),
the electromagnetic wave collection module (E) comprises an electromagnetic wave Receiving Antenna (RA), an energy conversion component (EC), a primary energy storage Capacitor (CP) and a boosting component (VB) which are connected in sequence, the boosting component (VB) is connected with the input end of a secondary energy storage Capacitor (CS),
the power supply interval control module (VT) comprises a lower limit conducting part (U1), an upper limit conducting part (U2), a field effect tube (Q), an interval switch control part (U3), a pull-up resistor (R), a first diode (D1) and a second diode (D2),
the input end of the lower limit conducting component (U1) is the input end of the power supply interval control module (VT), the input end of the lower limit conducting component (U1) is connected with the output end of the secondary energy storage Capacitor (CS),
the output end of the lower limit conducting component (U1) is respectively connected with one end of a pull-up resistor (R), the S pole of a field effect tube (Q) and the input end of an upper limit conducting component (U2),
the other end of the pull-up resistor (R) is respectively connected with the G pole of the field effect transistor (Q) and the output end of the interval switch control component (U3),
the D pole of the field effect transistor (Q) is connected with the anode of a first diode (D1),
the input terminal of the upper limit conducting part (U2) is connected with the anode of the second diode (D2),
the input end of the interval switch control component (U3), the cathode of the first diode (D1) and the cathode of the second diode (D2) are connected to form the output end of the power supply interval control module (VT),
the turn-on voltage V1 of the lower limit turn-on means (U1) is smaller than the turn-on voltage V2 of the upper limit turn-on means (U2),
when the voltage at the input end of the interval switch control part (U3) is less than or equal to the working voltage threshold value, the output end of the interval switch control part (U3) is in a high-impedance state;
when the voltage of the input end of the interval switch control component (U3) is larger than the working voltage threshold value and is less than or equal to the switch conducting voltage threshold value V3, the output end of the interval switch control component (U3) is electrically grounded,
when the voltage of the input end of the interval switch control component (U3) is larger than the switch conducting voltage threshold value V3, the output end and the input end of the interval switch control component (U3) are conducted,
the switch turn-on voltage threshold V3 is equal to or higher than the turn-on voltage V2 of the upper limit turn-on block (U2),
when the G electrode of the field effect tube (Q) is at a high level, the S electrode and the D electrode are disconnected, when the G electrode of the field effect tube (Q) is at a low level, the S electrode and the D electrode are conducted,
the electric energy released in the process that the voltage of the secondary energy storage Capacitor (CS) is reduced from the breakover voltage V2 to the breakover voltage V1 can be supplied to a rear-stage monitoring device connected with the output end of the power supply interval control module (VT) to complete energy consumption in one-time starting, detection and communication processes.
2. The electromagnetic wave conversion power supply module according to claim 1,
the electromagnetic wave collecting modules (E) are multiple, and electromagnetic wave Receiving Antennas (RA) in the electromagnetic wave collecting modules (E) receive electromagnetic waves of different frequency bands.
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| CN103269132B (en) * | 2013-05-23 | 2015-07-08 | 北京赛易科信息技术有限公司 | Sensor power supply method and power supply device |
| CN107302269A (en) * | 2017-07-17 | 2017-10-27 | 青岛海信移动通信技术股份有限公司 | A kind of Energy harvesting methods and its system |
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