阅读说明：本技术 自供电式本安型传感器 (Self-powered intrinsic safety type sensor ) 是由 庄德玉 罗一民 邱锦波 刘宏睿 黎青 罗昆 南鹏飞 郭岱 于 2020-11-30 设计创作，主要内容包括：本发明涉及一种自供电式本安型传感器,包括依次连接的能量获取模块、电源管理模块、微控制器和多源传感器,能量获取模块中包含多个分别针对不同能量类型的能量获取电路,各能量获取电路之间相互独立,且各自通过一套可控开关与电源管理模块的供电端连接,微控制器通过输入输出接口连接电源管理模块的驱动信号输入端和监测信号输出端以及可控开关的控制输入端,微控制器监测电源管理模块和能量获取模块的工况,确定能量获取模块中一个或多个能量获取电路作为供电电路,并控制与供电电路相对应的各个可控开关接通、其他可控开关关断。本发明能持续稳定地工作在煤矿井下工况环境中,省去传感器线缆布线的繁琐,而且还避免了传感器线缆故障。(The invention relates to a self-powered intrinsic safety type sensor which comprises an energy acquisition module, a power management module, a microcontroller and a multi-source sensor which are sequentially connected, wherein the energy acquisition module comprises a plurality of energy acquisition circuits respectively aiming at different energy types, the energy acquisition circuits are mutually independent and are respectively connected with a power supply end of the power management module through a set of controllable switch, the microcontroller is connected with a driving signal input end and a monitoring signal output end of the power management module and a control input end of the controllable switch through an input/output interface, the microcontroller monitors the working conditions of the power management module and the energy acquisition modules, determines one or more energy acquisition circuits in the energy acquisition module as power supply circuits, and controls the on of each controllable switch corresponding to the power supply circuits and the off of other controllable switches. The invention can continuously and stably work in the underground working condition environment of the coal mine, saves the trouble of wiring of the sensor cable and also avoids the fault of the sensor cable.)

1. A self-powered intrinsic safety type sensor is characterized in that: including energy acquisition module, power management module, microcontroller and multisource sensor that connect gradually, still be connected with wireless communication module on the microcontroller, include a plurality of energy acquisition circuit to different energy types respectively in the energy acquisition module, mutual independence between each energy acquisition circuit, each energy acquisition circuit respectively through one set of controllable switch with the feeder ear of power management module is connected, microcontroller passes through input/output interface connection the drive signal input and the monitoring signal output of power management module and controllable switch's control input, microcontroller monitors the operating mode of power management module and energy acquisition module, confirms through calculation one or more energy acquisition circuit in the energy acquisition module is as supply circuit to each controllable switch that control and supply circuit correspond switches on, The other controllable switches are turned off.

2. A self-powered intrinsically safe sensor as claimed in claim 1, wherein: the energy acquisition module comprises at least two energy acquisition circuits of a temperature difference energy acquisition circuit, an optical energy acquisition circuit, a vibration energy acquisition circuit and an RF energy acquisition circuit.

3. A self-powered intrinsically safe sensor as claimed in claim 2, wherein: each energy acquisition circuit comprises an energy converter, a rectifying circuit, an energy buffer and a voltage stabilizing circuit which are electrically connected in sequence.

4. A self-powered intrinsically safe sensor as claimed in claim 3, wherein: the energy converter of the temperature difference energy acquisition circuit adopts a thermoelectric generator, the energy converter of the light energy acquisition circuit adopts a small photovoltaic cell panel, the energy converter of the vibration energy acquisition circuit adopts a piezoelectric device, and the energy converter of the RF energy acquisition circuit adopts an RF patch antenna.

5. A self-powered intrinsically safe sensor as claimed in claim 4, wherein: the thermoelectric generator adopts a TEG semiconductor thermoelectric generation sheet, and the piezoelectric device adopts a tuning fork type structure.

6. A self-powered intrinsically safe sensor as claimed in claim 1, 2, 3, 4 or 5, wherein: the power management module is provided with a transformer (TX1), a MOS tube (V1), a first diode (D1), a second diode (D2), a voltage stabilizing circuit (A1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a fourth capacitor (C4), a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5) and a sixth resistor (R6), wherein the primary side head end of the transformer (TX1) is connected with the negative electrode of the first diode (D1) and the positive electrode of the first capacitor (C1), the positive electrode of the first diode (D1) is used as a voltage input end of the power management module, the negative electrode of the first capacitor (C1) is grounded, the tail end of the transformer (TX1) is connected with the drain electrode of the MOS tube (V1), and the source electrode of the MOS tube (V1) and the first resistor (R3) are grounded respectively, the gate of the MOS transistor (V1) is further connected with one end of a first resistor (R1), the source of the MOS transistor (V1) is further connected with one end of a second resistor (R2), the secondary side of the transformer (TX1) is connected with a second capacitor (C2) in parallel, the head end of the secondary side of the transformer (TX1) is connected with the anode of a second diode (D2), the cathode of the second diode (D2) is connected with the input end of a voltage stabilizing circuit (A1), a fourth capacitor (C4) and a fifth resistor (R5) which are connected with each other in parallel are connected between the output end and the ground end of the voltage stabilizing circuit (A1), the anode of the fourth capacitor (C4) is connected with the output end of the voltage stabilizing circuit (A1), the tail end of the secondary side of the transformer (TX1) is grounded through a sixth resistor (R6), the cathode of the second diode (D2) is connected with the anode of a third capacitor (C3) and the cathode of the other end of the first resistor (R1) as the input end of the power management signal management module, the other end of the second resistor (R2), the input end and the output end of the voltage stabilizing circuit (A1) form a monitoring signal output end of the power management module.

7. A self-powered intrinsically safe sensor as claimed in claim 6, wherein: the microcontroller monitors the voltage amplitude Um at the input end of the voltage stabilizing circuit (A1) in real time, when Um is smaller than a preset value, the duty ratio of the MOS tube (V1) is improved by changing the driving signal, and when Um is larger than the preset value, the duty ratio of the MOS tube (V1) is reduced by changing the driving signal, so that the dynamic balance of the voltage amplitude Um is realized.

8. A self-powered intrinsically safe sensor as claimed in claim 7, wherein: the fourth capacitor (C4) adopts a super capacitor, the microcontroller calculates the charging current Im flowing through the second resistor (R2) by measuring the voltage drop of the third resistor (R3), and when the terminal voltage Uout of the super capacitor is greater than the rated voltage delta U1 and the charging current Im is less than the set minimum charging current Icm, the modulation of the power management module is stopped; and when the terminal voltage Uout of the super capacitor is smaller than the set minimum voltage Us, starting modulation of the power management module to charge the super capacitor.

9. A self-powered intrinsically safe sensor as claimed in claim 6, wherein: the wireless communication module comprises an infrared awakening module inside, and the wireless communication module is switched from a sleep state to a working state through the infrared awakening module.

10. A self-powered intrinsically safe sensor as claimed in claim 2, 3, 4, 5, 6, 7, 8 or 9, wherein: the multi-source sensor comprises at least two of a temperature sensor, a light intensity sensor, a vibration sensor and an RF sensor, energy types related to sensor types contained in the multi-source sensor cover but are not limited to all energy types which can be acquired by the energy acquisition module, the multi-source sensor acquires working condition environment information in real time and transmits the working condition environment information to the microcontroller, and the microcontroller selects an energy acquisition circuit corresponding to one or more energy types which have more energy or are easier to acquire in at least one period of time in the working condition environment as only or main power supply circuit by comparing one or more factors of the amount, fluctuation condition and acquisition difficulty of various different types of energy in the working condition environment.

Technical Field

The invention relates to a self-powered sensor, in particular to a sensor for monitoring the state of mechanical equipment under a coal mine.

Background

The conventional sensor needs additional external power supply and communication cables to complete power supply and signal transmission required by normal operation of the sensor. With the continuous development of the intelligent technology of underground equipment of coal mines, the types and the number of special sensors for detecting electromechanical equipment and underground working condition environments are increased rapidly. When the traditional sensor is arranged, the sensor needs to be specially processed aiming at various sensor cables, but various faults of the sensor can still occur due to the abnormal cable. Especially, when the sensor is applied under a coal mine, the harsh working conditions such as vibration, gas, dust, water mist and the like pose a severe challenge to the arrangement of the traditional sensor.

With the development of the internet of things technology, sensors with the characteristic of self-power supply are widely applied, but the existing self-power supply sensors cannot continuously and stably work in the underground working condition environment.

Disclosure of Invention

The invention aims to provide a self-powered intrinsic safety type sensor which can continuously and stably work in a coal mine underground working condition environment, so that the complexity of sensor cable wiring is saved, and the fault of a sensor cable is avoided.

The main technical scheme of the invention is as follows:

the utility model provides a self-powered formula ann's type sensor, includes energy acquisition module, power management module, microcontroller and multisource sensor that connect gradually, still be connected with wireless communication module on the microcontroller, include a plurality of energy acquisition circuit to different energy types respectively in the energy acquisition module, mutual independence between each energy acquisition circuit, each energy acquisition circuit respectively through one set of controllable switch with the feeder ear of power management module is connected, microcontroller passes through input/output interface connection the drive signal input and the monitoring signal output of power management module and controllable switch's control input, microcontroller monitors the operating mode of power management module and energy acquisition module, confirms through calculation one or more energy acquisition circuit in the energy acquisition module is as supply circuit to each controllable switch-on that control and supply circuit correspond, The other controllable switches are turned off.

The energy harvesting module may include at least two of a temperature differential energy harvesting circuit, an optical energy harvesting circuit, a vibrational energy harvesting circuit, and an RF energy harvesting circuit.

Each energy acquisition circuit comprises an energy converter, a rectifying circuit, an energy buffer and a voltage stabilizing circuit which are electrically connected in sequence.

The energy converter of the temperature difference energy acquisition circuit adopts a thermoelectric generator, the energy converter of the light energy acquisition circuit adopts a small photovoltaic cell panel, the energy converter of the vibration energy acquisition circuit adopts a piezoelectric device, and the energy converter of the RF energy acquisition circuit adopts an RF patch antenna.

The power management module is provided with a transformer TX1, a MOS tube V1, a first diode D1, a second diode D2, a voltage stabilizing circuit A1, a first capacitor C1, a second capacitor C2, a third capacitor C2, a fourth capacitor C2, a first resistor R2, a second resistor R2, a third resistor R2, a fourth resistor R2, a fifth resistor R2 and a sixth resistor R2, wherein the head end of the primary side of the transformer TX 2 is connected with the cathode of the first diode D2 and the anode of the first capacitor C2, the anode of the first diode D2 is used as the voltage input end of the power management module, the cathode of the first capacitor C2 is grounded, the tail end of the primary side of the transformer TX 2 is connected with the drain of the MOS tube V2, the source and gate of the MOS tube V2 are respectively grounded through the third resistor R2 and the fourth resistor R2, the gate of the MOS tube V2 is also connected with one end of the MOS tube V2, and the source of the secondary resistor V2 connected with one end of the MOS tube V2 in parallel with the first resistor R2, meanwhile, the head end of the secondary side of the transformer TX1 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to the input end of the voltage stabilizing circuit a1, a fourth capacitor C4 and a fifth resistor R5 which are connected in parallel with each other are connected between the output end and the ground end of the voltage stabilizing circuit a1, the anode of the fourth capacitor C4 is connected to the output end of the voltage stabilizing circuit a1, the tail end of the secondary side of the transformer TX1 is grounded through a sixth resistor R6, the cathode of the second diode D2 is connected to the anode of the third capacitor, the cathode of the third capacitor C3 is grounded, the other end of the first resistor R1 serves as the driving signal input end of the power management module, and the other end of the second resistor R2, the input end of the voltage stabilizing circuit a1 and the output end constitute the monitoring signal output.

The microcontroller monitors the voltage amplitude Um at the input end of the voltage stabilizing circuit A1 in real time, when Um is smaller than a preset value, the duty ratio of the MOS tube V1 is improved by changing the driving signal, and when Um is larger than the preset value, the duty ratio of the MOS tube V1 is reduced by changing the driving signal, so that the dynamic balance of the voltage amplitude Um is realized.

The fourth capacitor C4 adopts a super capacitor, the microcontroller calculates the charging current Im flowing through the second resistor R2 by measuring the voltage drop of the third resistor R3, and when the terminal voltage Uout of the super capacitor is greater than the rated voltage delta U1 and the charging current Im is less than the set minimum charging current Icm, the modulation of the power management module is stopped; and when the terminal voltage Uout of the super capacitor is smaller than the set minimum voltage Us, starting modulation of the power management module to charge the super capacitor.

The wireless communication module comprises an infrared awakening module inside, and the wireless communication module is switched from a sleep state to a working state through the infrared awakening module.

The multi-source sensor preferably comprises at least two of a temperature sensor, a light intensity sensor, a vibration sensor and an RF sensor, the energy types related to the sensor types contained in the multi-source sensor cover but are not limited to all the energy types which can be acquired by the energy acquisition module, the multi-source sensor acquires working condition environment information in real time and transmits the working condition environment information to the microcontroller, and the microcontroller selects an energy acquisition circuit corresponding to one or more energy types which have more energy or are easier to acquire in at least one period of time in the working condition environment as only or main power supply circuit by comparing one or more factors of the amount, fluctuation condition and acquisition difficulty of various types of energy in the working condition environment.

The invention has the beneficial effects that:

the self-powered intrinsic safety type sensor has multiple self-powered energy sources, so that the problem that the application requirements of various underground typical working conditions cannot be met due to power supply of a single energy source is avoided, stable and reliable self-power supply is easy to realize, the sensor can continuously and stably work in the underground environment of a coal mine, the self-powered intrinsic safety type sensor can be expanded and applied to occasions under similar working conditions such as the underground environment of the coal mine, the traditional sensor cable wiring operation is omitted, and the sensor cable fault in the using process is also avoided.

The energy acquisition module preferably adopts at least two of a temperature difference energy acquisition circuit, a light energy acquisition circuit, a vibration energy acquisition circuit and an RF energy acquisition circuit, so that the self-powered intrinsic safety type sensor can directly acquire energy from the underground coal mine working condition environment, is more convenient and quick and can effectively utilize the energy in the underground coal mine working condition environment.

The specific circuit structure of the power management module combines the real-time monitoring and control of the microcontroller on the power management module, so that the timely power supply of the self-contained power supply in the sensor, the timely charging of the internal energy storage element and the voltage stabilization of the power output are realized.

Preferably, the energy types related to the energy acquisition circuits correspond to the multi-source sensor, so that the multi-source sensor can transmit real-time acquired working condition environment information to the microcontroller, the information on which the microcontroller selects the power supply circuit is more comprehensive, the determined power supply circuit or power supply circuit combination is more reasonable, and the utilization rate of the energy in the working condition environment is more favorably improved.

Drawings

FIG. 1 is a functional block diagram of the present invention;

FIG. 2 is a functional schematic of the power management module of the present invention;

FIG. 3 is a logic diagram for determining the operation mode of the present invention.

Reference numerals:

1. an energy acquisition module; 2. a power management module; 3. a wireless communication module; 4. a plurality of serial port communication interfaces; 5. a multi-source sensor; 6. an infrared wake-up module; 7. an input/output interface; 8. system power consumption; 9. working condition environment information; 10. an energy calculator; 11. a switch control table; 12. and (5) power amplification.

Detailed Description

The invention discloses a self-powered intrinsic safety type sensor, which comprises an energy acquisition module 1, a power management module 2, a microcontroller and a multi-source sensor 5 which are electrically connected in sequence as shown in figures 1-3. The energy acquisition module is used for collecting energy in various environments, and comprises a plurality of energy acquisition circuits aiming at different energy types, the energy acquisition circuits are mutually independent, and the energy acquisition circuits are connected with the power supply end of the power supply management module through a set of controllable switches. The microcontroller is also connected with a wireless communication module 3, and the wireless communication module enables the microcontroller to have a wireless communication function, can transmit wireless signals outwards, and can also receive wireless signals from an upper computer, such as receiving instructions and data. The microcontroller is connected with the driving signal input end and the monitoring signal output end of the power management module and the control input end of the controllable switch through the input/output interface 7, so that the microcontroller can directly complete control and current monitoring protection of the power management module and switch energy acquisition circuits of different energy types to serve as power supply circuits. The microcontroller monitors that the power management module can master the power consumption condition of the system, determines one or more energy acquisition circuits in the energy acquisition module as power supply circuits, and controls the on and off of each controllable switch corresponding to the power supply circuits, and other controllable switches, so that power supplies of various energy types are combined to provide continuous and stable power supply for the multi-source sensor.

The controllable switches can work independently or synchronously.

The multi-source sensor can be used for detecting the state of electromechanical equipment and the underground working condition environment (generally, the environments of the microcontroller, the power management module and the energy acquisition module, including environmental factors such as temperature, illuminance, vibration and RF energy intensity) at the same time), can detect various physical quantities, and can be generally communicated with the microcontroller through a multi-path serial port communication interface 4.

The self-powered intrinsic safety type sensor has multiple self-powered energy sources, avoids the problem that the application requirements of various underground typical working conditions cannot be met due to power supply of a single energy source, and is easy to realize stable and reliable self-power supply, so that the sensor can continuously and stably work in the underground environment of a coal mine, the self-powered type sensor can be expanded and applied to occasions under similar working conditions such as the underground environment of the coal mine, the traditional sensor cable wiring operation is omitted, and the sensor cable fault in the using process is also avoided.

Because various energies such as temperature, illumination, vibration, RF energy and the like exist in the underground coal mine, at least two of a temperature difference energy acquisition circuit, a light energy acquisition circuit, a vibration energy acquisition circuit and an RF energy acquisition circuit are preferably adopted by the energy acquisition module, so that the self-powered intrinsic safety type sensor can directly acquire energy from the underground coal mine working condition environment, and the energy in the underground coal mine working condition environment is effectively utilized while the self-powered intrinsic safety type sensor is more convenient.

Each energy acquisition circuit comprises an energy converter, a rectifying circuit, an energy buffer and a voltage stabilizing circuit which are electrically connected in sequence. The energy converter of the temperature difference energy acquisition circuit can adopt a thermoelectric generator, the energy converter of the light energy acquisition circuit can adopt a small photovoltaic cell panel, the energy converter of the vibration energy acquisition circuit can adopt a piezoelectric device, and the energy converter of the RF energy acquisition circuit can adopt an RF patch antenna. The photovoltaic panel and the RF patch antenna may be integrated into the energy harvesting module as an auxiliary power supply.

Furthermore, the thermoelectric generator preferably adopts a TEG semiconductor thermoelectric generation sheet, taking the application of underground rotating machinery as an example, the hot end of the thermoelectric generation sheet is arranged in the high-temperature area of the gear box, and the cold end of the thermoelectric generation sheet dissipates heat through a water channel radiator of the coal mine equipment. The piezoelectric device preferably employs a piezoelectric device of a tuning fork type structure having a plurality of resonance points.

The power management module adopts a Boost topological structure.

As shown in fig. 2, the power management module in this embodiment is provided with a transformer TX1, a MOS transistor V1, a first diode D1, a second diode D2, a voltage regulator circuit a1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. The head end of the primary side of the transformer TX1 is connected to the cathode of the first diode D1 and the anode of the first capacitor C1, and the anode of the first diode D1 is used as the voltage input end (i.e., the power supply end) of the power management module and is connected to each of the controllable switches.

The negative electrode of the first capacitor C1 is grounded, the terminal of the primary side of the transformer TX1 is connected to the drain of the MOS transistor V1, and the source and the gate of the MOS transistor V1 are grounded via the third resistor R3 and the fourth resistor R4, respectively. The gate of the MOS transistor V1 is also connected to one end of a first resistor R1. The source of the MOS transistor V1 is also connected to one end of a second resistor R2.

The secondary side of the transformer TX1 is connected in parallel with a second capacitor C2, meanwhile, the head end of the secondary side of the transformer TX1 is connected to the anode of a second diode D2, the cathode of the second diode D2 is connected to the input end of the voltage stabilizing circuit a1, a fourth capacitor C4 and a fifth resistor R5 which are connected in parallel with each other are connected between the output end of the voltage stabilizing circuit a1 and the ground end, wherein the fourth capacitor C4 is an energy storage component of the power management module, the anode of the fourth capacitor C4 is connected to the output end of the voltage stabilizing circuit a1, the tail end of the secondary side of the transformer TX1 is grounded through a sixth resistor R6, the cathode of the second diode D6342 is connected to the anode of the third capacitor, and the cathode of.

The other end of the first resistor R1 is used as the driving signal Drm input end of the power management module, and the other end of the second resistor R2, the input end and the output end of the voltage regulator circuit a1 form the monitoring signal output end of the power management module. The driving signal Drm comes from the microcontroller and is used for controlling the on-off state and the on-off frequency of the MOS transistor V1, so as to adjust the duty ratio, and further change the terminal voltage Um of the third capacitor, which is also the input voltage of the voltage stabilizing circuit a 1.

The monitoring signals comprise an input end voltage Um, an output end voltage Uout (also the end voltage of the fourth capacitor C4 and the output voltage of the power management module) of the voltage stabilizing circuit a1, a charging current Im flowing through the second resistor R2 and system power consumption. Where Um, Uout can be directly obtained. The third resistor R3 is a sampling resistor. The microcontroller calculates the charging current Im flowing through the second resistor R2 by measuring the voltage drop on the sampling resistor, and further calculates the system power consumption by Uout and Im, thereby realizing the monitoring of the power management module.

The microcontroller monitors the input voltage amplitude Um of the voltage stabilizing circuit A1 in real time, when Um is smaller than a preset value, the duty ratio of the MOS tube V1 is improved by changing the driving signal Drm, when Um is larger than the preset value, the duty ratio of the MOS tube V1 is reduced by changing the driving signal Drm, dynamic balance of the voltage amplitude Um is further achieved, and voltage stabilizing effect of the voltage stabilizing circuit A1 is matched, so that voltage stabilization of output voltage of the power management module is finally achieved.

The fourth capacitor C4 is a super capacitor.

The microcontroller monitors the terminal voltage Uout and the charging current Im of the super capacitor, and when the terminal voltage Uout of the super capacitor is greater than the rated voltage delta U1 and the charging current Im is less than the set minimum charging current Icm, the modulation of the power management module is stopped; and when the terminal voltage Uout of the super capacitor is smaller than the set minimum voltage Us, starting modulation of the power management module to charge the super capacitor. The modulation to start and stop the power management module is achieved by the application and non-application of the drive signal Drm.

The wireless communication module comprises an infrared awakening module 6 inside, so that the wireless communication module has the characteristic of low power consumption. The wireless communication module can be switched into a working state from a sleep state through the infrared awakening module. The infrared awakening module uses a single pulse proximity measurement technology, and when the proximity distance of the trigger object is smaller than the lowest detection distance or is out of the detection range (when the trigger object does not work), the system automatically enters a low power consumption mode.

The wireless communication module has three modes of a Wi-Fi communication mode, a Bluetooth communication mode and a Wi-Fi and Bluetooth common communication mode in the working state.

The microcontroller can estimate the charging state and the available electric quantity of the fourth capacitor C4, and then the estimation result is used as a judgment basis to realize the control of whether the multi-source sensor signal is read or not and what state the wireless communication module is in. For example, when the available electric quantity is too low, the multi-source sensor is controlled not to work, the wireless communication module is controlled to be in a sleep state, and the normal operation of the microcontroller is preferentially ensured.

The types and the number of the sensors included in the multi-source sensor are not limited, but the types of the sensors included in the multi-source sensor preferably cover all types of the energy acquired by the energy acquisition module, for example, the energy acquisition module includes a temperature difference energy acquisition circuit, a light energy acquisition circuit and a vibration energy acquisition circuit, so that the multi-source sensor preferably includes but is not limited to a temperature sensor, a light intensity sensor and a vibration sensor, that is, the types of the energy related to each energy acquisition circuit correspond to each other in the multi-source sensor, in this case, in a normal working state, the multi-source sensor can transmit real-time acquired working condition environment information, working condition information of the energy acquisition module and a power management module (for example, the vibration condition of the energy acquisition module) and the like to the microcontroller, so that the microcontroller can specifically and comprehensively grasp the self-powered intrinsic safety type sensor, the energy acquisition circuit corresponding to one or more energy types with more or more easily acquired energy in at least one time interval in the working condition environment is selected as a power supply circuit, or the energy acquisition circuit corresponding to one or more energy types with more or more easily acquired energy in the working condition environment is selected as a main power supply circuit, and the rest energy acquisition circuits are used as auxiliary power supply circuits, so that the information on which the power supply circuit is determined is more comprehensive, the determined power supply circuit or power supply circuit combination is more reasonable, and the utilization rate of the energy in the working condition environment can be improved as much as possible.

Further, under the condition that the energy acquisition module comprises at least two energy acquisition circuits of a temperature difference energy acquisition circuit, an optical energy acquisition circuit, a vibration energy acquisition circuit and an RF energy acquisition circuit, the multi-source sensor preferably comprises at least two of a temperature sensor, an illuminance sensor, a vibration sensor and an RF sensor, and the types of the sensors correspond to the types of energy which can be acquired by the energy acquisition module one by one.

Further: the energy acquisition module comprises a temperature difference energy acquisition circuit, an optical energy acquisition circuit, a vibration energy acquisition circuit and an RF energy acquisition circuit, and the multi-source sensor comprises a temperature sensor, an illuminance sensor, a vibration sensor and an RF sensor.

The working mode judging logic of the application is shown in fig. 3, the multi-source sensor 5 transmits the peripheral working condition environment information 9 of the sensor, such as vibration, illuminance, temperature and other data to the microcontroller in real time, the energy calculator 10 in the microcontroller judges the energy possibly generated by each energy converter, and then the switch combination of the controllable switch is determined, and the switch state combination of the four energy sources is corresponding. In the fourth capacitor charging state, the preferred scheme is to supply power synchronously to four energy sources. In the standby state of the sensor, the microcontroller selects one or more energy acquisition circuits from the energy acquisition module to supply power to the equipment according to the real-time system power consumption 8. The switch combination of the controllable switch exists in the form of a switch control table 11 in the microcontroller, the switch control table corresponds to the switch state of the actual switch device of the controllable switch, the switch control table is output to a multi-path power amplifier 12 by an input/output interface 7 to implement switch signal control, and the controllable switch is controlled by the power amplifier 12.