CN113091950A - Wireless temperature measurement system - Google Patents
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- CN113091950A CN113091950A CN202110258110.8A CN202110258110A CN113091950A CN 113091950 A CN113091950 A CN 113091950A CN 202110258110 A CN202110258110 A CN 202110258110A CN 113091950 A CN113091950 A CN 113091950A
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- 238000009529 body temperature measurement Methods 0.000 title claims abstract description 68
- 238000001514 detection method Methods 0.000 claims abstract description 35
- 238000004146 energy storage Methods 0.000 claims abstract description 31
- 238000004891 communication Methods 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 37
- 230000005611 electricity Effects 0.000 claims description 8
- 238000004861 thermometry Methods 0.000 claims 2
- 230000001131 transforming effect Effects 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005259 measurement Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K1/00—Details of thermometers not specially adapted for particular types of thermometer
- G01K1/02—Means for indicating or recording specially adapted for thermometers
- G01K1/024—Means for indicating or recording specially adapted for thermometers for remote indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/02—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using thermoelectric elements, e.g. thermocouples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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Abstract
The invention discloses a wireless temperature measurement system, belongs to the field of temperature measurement devices, and aims to solve the problems of data transmission failure and no energy-saving function of the conventional wireless temperature measurement module, and the technical scheme is as follows: a wireless temperature measurement system comprises a power supply module and a wireless temperature measurement module, wherein the power supply module comprises a power taking unit, a rectifying unit, an energy storage unit, an energy detection and switch unit and a voltage conversion unit; the wireless temperature measurement module comprises a temperature measurement unit and a wireless communication and control unit, the energy detection and switch unit is connected with the energy storage unit and detects the energy of the energy storage unit, and meanwhile, the power supply is turned on or turned off according to the energy of the energy storage unit; the wireless communication and control unit transmits the measurement result of the temperature measurement unit, calculates the interval time and sends out the calculation result. The energy detection and switch unit can effectively reduce the condition of data transmission failure caused by insufficient energy, and has the effect of reasonable energy configuration.
Description
Technical Field
The invention belongs to the field of temperature measuring devices, and particularly relates to a wireless temperature measuring system.
Background
With the development of wireless communication technology, there are more and more ways for power systems to detect and monitor the safety and operational status of power lines. The wireless temperature measurement module is important equipment for detecting the safety and the running state of the power line.
The wireless temperature measurement module gets electricity through the mutual inductor, regularly detects the power line temperature through temperature sensor after, by wireless communication module, like bluetooth, WIFI etc. send for the master device periodically. The principle of electricity taking of the mutual inductor is that energy consumption is needed when the wireless temperature measuring module works and the energy is obtained by sensing a magnetic field generated by alternating current flowing through a power line, when the energy at the capacitor end is too small, the temperature measuring module cannot be maintained to work, at the moment, the wireless temperature measuring module cannot obtain enough energy to work, and data transmission is failed.
Disclosure of Invention
The invention provides a wireless temperature measurement system, aiming at the problem of data transmission failure of the existing wireless temperature measurement module, which is provided with an energy detection and switch unit capable of realizing opening and closing according to the energy of an energy storage unit, so that the problem of data transmission failure caused by insufficient energy is solved, and the effect of reasonable energy allocation is achieved.
The technical scheme adopted by the invention is as follows: a wireless temperature measurement system comprises a power supply module and a wireless temperature measurement module,
the power supply module includes:
the power taking unit is used for acquiring electric quantity from a power line of a power grid;
the rectifying unit is connected with the electricity taking unit and is used for rectifying the electric energy acquired by the electricity taking unit;
the energy storage unit stores the electric energy rectified by the rectifying unit;
the energy detection and switch unit is connected with the energy storage unit, detects the energy of the energy storage unit and simultaneously turns on or off power supply according to the energy of the energy storage unit;
the voltage conversion unit is connected between the energy detection and switch unit and the wireless temperature measurement module, and transmits the electric energy on the energy storage unit and the power line to the wireless temperature measurement module when the energy detection and switch unit is started;
the wireless temperature measurement module includes:
the temperature measuring unit is powered by the voltage conversion unit and is used for measuring the temperature on the power line;
and the wireless communication and control unit is powered by the voltage conversion unit, is connected with the temperature measurement unit, is used for transmitting the temperature measurement data of the temperature measurement unit, calculates the interval time for transmitting the temperature measurement data next time, and sends out the interval time.
When the current on the power line is large, the temperature is correspondingly high, and when the current is small, the temperature is correspondingly low, the traditional wireless temperature detection module works in a fixed period, but when the current on the power line is small, the energy stored by the wireless temperature detection module is insufficient, so that the data cannot be sent out; the power detection and switch unit can be used for turning on or off power supply according to the energy of the energy storage unit, only the capacitor is charged when the energy on the power line is insufficient, and the wireless temperature measurement module is turned on to supply power when the energy on the power line and the energy of the capacitor are sufficient, so that the condition that data transmission fails due to insufficient energy is avoided, and the effect of reasonable energy configuration is achieved.
Further, the energy storage unit is one or more capacitors or energy storage coils, preferably a capacitor, when the voltage V at the end of the capacitor is voltagecSatisfy the requirement of
When the energy detection and switch unit is started, the energy detection and switch unit is started; when the voltage at the capacitor terminal VcSatisfy the requirement of
When the energy detection and switch unit is turned off, C is a capacitance value, PdIs the working power (i.e. the sum of the power of the temperature measuring unit and the power of the wireless communication and control unit) of the wireless temperature measuring module, tdThe working time of the wireless temperature measurement module is determined according to the temperature measurement and emission data of the temperature measurement unit and the wireless communication and control unit, and when the temperature measurement data volume needing to be sent is large, the larger the energy consumed by the wireless temperature measurement module is, the longer the charging time needed by the energy storage unit is.
Further, the interval time tTSatisfies the following conditions:
tT＝RCln[Vm/(Vm-Vc)]
wherein, VmThe maximum voltage of the capacitor end, R is the internal resistance of the capacitor, and C is the resistance of the capacitor.
Terminal voltage V of capacitorcSatisfies the following conditions:
the interval time t of the next data transmission can be obtained according to the formulaT。
Furthermore, the energy detection and switch unit comprises a first input end and a second input end which are connected with the energy storage unit, a first output terminal and a second output terminal connected to the voltage conversion unit, a first resistor and a second resistor, and the first end of the first resistor is coupled with the first input end, the second end of the first resistor is coupled with the first end of the second resistor, the second end of the second resistor is coupled at the joint of the second input end and the second output end, the first end of the first transistor is coupled with the first input end, the second end of the first transistor is coupled with the first output end, the first end of the second transistor is coupled with the third end of the first transistor, the second end of the second transistor is coupled at the joint of the second resistor and the second output end, and the third end of the second transistor is coupled at the joint of the first resistor and the second resistor.
Further, when the voltage at the capacitor terminal is VcSatisfy the requirement of
When the first transistor is turned on, the second transistor is turned on and triggers the first transistor to be turned on.
Furthermore, the first transistor is a PNP-type triode, the first end of the PNP-type triode is an emitter, the second end of the PNP-type triode is a collector, and the third end of the PNP-type triode is a base; the second transistor is an enhanced NMOS field diode, the first end of the second transistor is a drain electrode, the second end of the second transistor is a source electrode, and the third end of the second transistor is a grid electrode.
Further, the energy detection and switch unit further comprises a zener diode, an anode of the zener diode is coupled to the third terminal of the second transistor, and a cathode of the zener diode is coupled to a connection point of the first resistor and the second resistor.
Furthermore, the energy detection and switch unit further includes a third resistor, one end of the third resistor is coupled to the connection between the second transistor and the zener diode, and the other end of the third resistor is coupled to the connection between the second transistor and the second resistor.
Further, the electricity taking unit is a mutual inductance transformer, and the rectifying unit is provided with a bridge rectifier, a half-wave rectifier or a full-wave rectifier circuit; the temperature measuring unit is a temperature sensor, a thermistor or a thermocouple.
Furthermore, the wireless temperature measurement system also comprises a receiving end, and the receiving end is used for receiving the temperature measurement data and the interval time sent by the wireless communication and control unit and is opened or closed according to the received interval time. The receiving end that commonly uses is in the receiving state always, can't realize energy-conserving low-power consumption, and the receiving end that this application adopted can open and close according to the interval time, reaches energy-conserving effect.
The invention has the following beneficial effects: the energy detection and switch unit adopted by the invention can be used for switching on or switching off power supply according to the energy of the energy storage unit, so that the condition of data transmission failure caused by insufficient energy is avoided, and meanwhile, the effect of reasonable energy configuration is achieved.
Drawings
FIG. 1 is a functional block diagram of the present invention;
FIG. 2 is a circuit diagram of an embodiment;
FIG. 3 is a diagram illustrating the relationship between the capacitor voltage and the transmission power of the wireless module according to the present invention.
In the figure: 1-a power line; 2-a power taking unit; 3-a rectifying unit; 4-an energy storage unit; 5-an energy detection and switching unit; 6-a voltage conversion unit; 7-a wireless communication and control unit; 8-a temperature measuring unit; 9-a receiving end; t1-mutual inductance transformer; d1-diode; d2-zener diode; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; c1-capacitance; q1-first transistor; q2 — second transistor; a-a first input; b-a second input terminal; c-a first output terminal; d-a second output terminal.
Detailed Description
The technical solutions of the embodiments of the present invention are explained and explained below with reference to the drawings of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
The wireless temperature measurement system of the present embodiment includes a power supply module, a wireless temperature measurement module and a receiving end 9, as shown in fig. 1 and 2,
the power supply module includes:
the electricity taking unit 2 adopts a mutual inductance transformer T1, a primary side obtains electric quantity from a power line 1 of a power grid, and a secondary side is connected with the rectifying unit 3;
the rectifying unit 3 is connected with the power taking unit 2 and rectifies the electric energy obtained by the power taking unit 2;
the energy storage unit 4 stores the electric energy rectified by the rectifying unit 3; in the embodiment, a capacitor C1 is used as the energy storage unit 4;
the energy detection and switch unit 5 includes a first input end a and a second input end B connected to the energy storage unit 4, a first output end C and a second output end D connected to the voltage conversion unit 6, a first resistor R1 and a second resistor R2, a zener diode D2, a third resistor R3, a fourth resistor R4, a first transistor Q1 and a second transistor Q2, the second input end B is connected to the second output end D, a first end of the first resistor R1 is coupled to the first input end a, a second end of the first resistor R1 is coupled to a first end of the second resistor R2, a second end of the second resistor R2 is coupled to a connection between the second input end B and the second output end D, the first transistor Q1 is a PNP triode-type PNP, the first end is an emitter, the second end is a collector, and the third end is a base; the second transistor Q2 is an enhanced NMOS field diode, and has a first end serving as a drain, a second end serving as a source, and a third end serving as a gate;
when the voltage V at the end of the capacitor C1cSatisfy the requirement of
When the energy detection and switch unit 5 is started, the enhanced NMOS field pole tube is conducted, and the PNP type triode is triggered to be conducted; when the voltage V at the end of the capacitor C1cSatisfy the requirement of
When the power supply is started, the enhanced NMOS field pole tube and the PNP type triode are closed, namely the energy detection and switch unit 5 is closed;
wherein, PdFor the working power of the wireless temperature measuring module (i.e. the temperature measuring unit 8 and the wireless communication andsum of the powers of both control units 7), tdThe working time of the wireless temperature measurement module is determined according to the temperature measurement and emission data of the temperature measurement unit 8 and the wireless communication and control unit 7, and when the amount of temperature measurement data needing to be sent is large, the larger the energy consumed by the wireless temperature measurement module is, the longer the charging time needed by the energy storage unit 4 is.
An emitter is coupled with the first input terminal a, a collector is coupled with the first output terminal C, a drain is connected with a base through a fourth resistor R4, a source is coupled with the connection of the second resistor R2 and the second output terminal D, an anode of the zener diode D2 is coupled with a gate, and a cathode of the zener diode D2 is coupled with the connection of the first resistor R1 and the second resistor R2; one end of the third resistor R3 is coupled at the connection of the grid and the Zener diode D2, and the other end is coupled at the connection of the source and the second resistor R2;
and a voltage conversion unit 6, which is a DC-DC converter in fig. 2, connected between the energy detection and switch unit 5 and the wireless temperature measurement module, and transmitting the electric energy on the energy storage unit 4 and the power line 1 to the wireless temperature measurement module when the energy detection and switch unit 5 is turned on;
the wireless temperature measurement module includes:
the temperature measuring unit 8 is powered by the voltage converting unit 6 and is used for measuring the temperature on the power line 1; the embodiment adopts a temperature sensor;
the wireless communication and control unit 7 is powered by the voltage conversion unit 6, is connected with the temperature measurement unit 8, is used for transmitting the temperature measurement data of the temperature measurement unit 8, calculates the interval time for transmitting the temperature measurement data next time, and sends the interval time to the receiving end 9; the wireless communication and control unit 7 comprises a single chip microcomputer and a wireless transmitting module, wherein the wireless transmitting module is bluetooth or WIFI, and bluetooth is used in the embodiment; in fig. 2, the wireless communication and control unit 7 is a bluetooth module;
and the receiving end 9 is used for receiving the temperature measurement data and the interval time sent by the wireless communication and control unit 7 and is started or closed according to the received interval time.
When the current on the power line 1 is large, the temperature is correspondingly high, and when the current is small, the temperature is correspondingly low, the traditional wireless temperature detection module works in a fixed period, but when the current on the power line 1 is small, the energy stored by the wireless temperature detection module is insufficient, so that the data cannot be sent out; the power line 1 has small energy, low current and low temperature, and the detection of the temperature of the power line 1 has little significance for reflecting the actual production situation, so that the energy detection and switch unit 5 adopted by the invention can turn on or off power supply according to the energy of the energy storage unit 4, only charges the capacitor C1 when the energy on the power line 1 is insufficient, and turns on the wireless temperature measurement module to supply power when the energy on the power line 1 is sufficient, thereby avoiding the situation of data transmission failure caused by insufficient energy, and having the effect of reasonable energy configuration; the receiving end 9 is turned on and off according to the interval time to realize the energy-saving function.
The working principle is as follows:
when the power line 1 has alternating current IpAfter flowing through, the transformer T1 generates a voltage V across its primary winding1Voltage V of1Is determined by equation 1.
Wherein L is primary inductance, IpIs the primary current.
According to the transformer principle, the secondary stage generates induced voltage, and the secondary voltage V is obtained under the condition that the mutual inductor is not connected with a load and the leakage inductance is not considered2Determined by equation 2.
Wherein n1 and n2 are primary and secondary turns respectively.
But when the secondary is connected to the load, a current I is generatedsDue to the current IsThe generated magnetic flux will counteract the original magnetic flux, V2Will be subjected to IsInfluence of the magnitude of (1), current IsThe larger the value is, the larger V2The smaller, the mathematical expression is shown in formula 3
V2＝Ve-IsR-jIsX formula 3
Wherein R is load impedance, X is leakage reactance, and VeFor the next most ideal output voltage, j represents a plurality of currents in different directions.
Current of secondary stage IsWill influence V2If V is2Too small will render the temperature measuring unit 8 and the wireless communication and control unit 7 inoperable. At the moment, the primary current I of the mutual inductor needs to be increased to work normallypOf amplitude or frequency, but in practice the primary current IpIs not controllable.
In order to solve the problem, the invention utilizes the power supply module to cut off the DC-DC converter when the output energy is insufficient, and stops the power supply to the temperature measurement unit 8 and the wireless communication and control unit 7 to ensure that the current I of the temperature measurement unit 8 and the wireless communication and control unit 7 flowssMainly supplies power to the capacitor C1, and when no other load exists, the voltage V at the two ends of the capacitor C1cWill be very close to V2. The wireless temperature measurement module works periodically, and only the energy is enough to work once.
The working electric energy of the wireless temperature measurement module is as follows:
Wd＝Pd*tdwherein W isdThe wireless temperature measurement module works with electric energy;
the energy storage circuit has the following electric energy:
According to the fact that the electric energy of the capacitor C1 is larger than the working electric energy (namely W) of the wireless temperature measurement modulec≥Wd) To derive
VcShould be equal to or greater than the lowest operating voltage of the temperature sensor and the bluetooth module. When the capacitance value C has been determined, as long as VcThe value of (A) is high enough to provide sufficient working energy, and must be maintainedThe work is proved to be normal at one time.
The specific operating principle of the circuit of fig. 2 is as follows:
when the voltage V2 is generated by the secondary of the transformer T1, the voltage V is rectified by a diode D1 to charge a capacitor C1. The voltage at two ends of R2 is obtained by dividing the voltage through resistors R1 and R2, the voltage is stabilized through a Zener diode D2, and the transistor is driven when V is equal to VcWhen the voltage exceeds the sum of the zener diode D2 turn-on voltage and the transistor turn-on voltage, the NMOS field diode Q2 is turned on, and the PNP transistor Q1 is caused to turn on. The energy stored in the capacitor C will now supply power to the DC-DC converter, the temperature sensor and the bluetooth module together with the energy on the power line 1. The DC-DC converter will convert the voltage VcConverted into a proper voltage V3 to be supplied to the temperature sensor and the Bluetooth module.
When V iscDoes not exceed the sum of the zener diode D2 turn-on voltage and the transistor turn-on voltage, causing the enhancement NMOS field diode Q2 to turn off and the PNP transistor Q1 to turn off. At this time, the power consumption of the whole system is very small, and most of the current is used for charging the capacitor C1, so that V iscAnd (4) rising. Fig. 3 is a graph showing the relationship between the capacitor voltage and the wireless module transmission power, and V0 in fig. 3 represents the lowest voltage after the capacitor transmits energy.
Interval time tTSatisfies the following conditions:
tT＝RCln[Vm/(Vm-Vc)]
wherein, VmThe maximum voltage of the capacitor end, R is the internal resistance of the capacitor, and C is the capacitance value.
Terminal voltage V of capacitorcSatisfies the following conditions:
the interval time t of the next data transmission can be obtained according to the formulaT。
The rectifying unit 3 is provided with a bridge rectifier, a half-wave rectifier or a full-wave rectifier circuit composed of a diode D1, and a half-wave rectifier circuit is adopted in the embodiment; the temperature measuring unit is a temperature sensor, a thermistor or a thermocouple.
Conduction condition of PNP transistor Q1: veb＞VonIn which V isebIs the emitter-base voltage difference, VonThe conduction voltage value of the PNP type transistor Q1 is obtained.
Enhancement NMOS field diode Q2 conduction condition:
wherein VcTo a terminal voltage of a capacitor, VGSTurn on voltage for enhancement NMOS field diode Q2; r1、R2Respectively, the resistance values of the first resistor and the second resistor.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art will appreciate that the invention includes, but is not limited to, the accompanying drawings and the description of the embodiments above. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. A wireless temperature measurement system is characterized by comprising a power supply module and a wireless temperature measurement module,
the power supply module includes:
the power taking unit is used for acquiring electric quantity from a power line of a power grid;
the rectifying unit is connected with the electricity taking unit and is used for rectifying the electric energy acquired by the electricity taking unit;
the energy storage unit stores the electric energy rectified by the rectifying unit;
the energy detection and switch unit is connected with the energy storage unit, detects the energy of the energy storage unit and is turned on or turned off according to the energy of the energy storage unit;
the voltage conversion unit is connected between the energy detection and switch unit and the wireless temperature measurement module, and transmits the electric energy on the energy storage unit and the power line to the wireless temperature measurement module when the energy detection and switch unit is started;
the wireless temperature measurement module includes:
the temperature measuring unit is powered by the voltage conversion unit and is used for measuring the temperature on the power line;
and the wireless communication and control unit is powered by the voltage conversion unit, is connected with the temperature measurement unit, is used for transmitting the temperature measurement data of the temperature measurement unit, calculates the interval time for transmitting the temperature measurement data next time, and sends out the interval time.
2. The wireless temperature measurement system of claim 2, wherein the energy storage unit is one or more capacitors, and when a voltage V at a terminal of the capacitor is measuredcSatisfy the requirement of
When the energy detection and switch unit is started, the energy detection and switch unit is started; when the voltage at the capacitor terminal VcSatisfy the requirement of
When the energy detection and switch unit is turned off, C is a capacitance value, PdOperating power, t, of the wireless temperature measuring moduledThe working time of the wireless temperature measurement module is.
3. The wireless thermometry system of claim 2, wherein the interval t isTSatisfies the following conditions:
tT＝RCln[Vm/(Vm-Vc)]
wherein, VmThe maximum voltage of the capacitor end, R is the internal resistance of the capacitor, and C is the capacitance value.
4. The wireless temperature measuring system of claim 2, wherein the energy detecting and switching unit comprises a first input terminal and a second input terminal connected to the energy storage unit, a first output terminal and a second output terminal connected to the voltage transforming unit, a first resistor and a second resistor, and a first transistor and a second transistor, the second input terminal is connected to the second output terminal, the first terminal of the first resistor is coupled to the first input terminal, the second terminal of the first resistor is coupled to the first terminal of the second resistor, the second terminal of the second resistor is coupled to the connection of the second input terminal and the second output terminal, the first terminal of the first transistor is coupled to the first input terminal, the second terminal of the first transistor is coupled to the first output terminal, the first terminal of the second transistor is coupled to the third terminal of the first transistor, the second terminal of the second transistor is coupled to the connection of the second resistor and the second output terminal, the third end of the second transistor is coupled to the junction of the first resistor and the second resistor.
5. The wireless thermometry system of claim 4, wherein the voltage V at the capacitor terminalcSatisfy the requirement of
When the first transistor is turned on, the second transistor is turned on and triggers the first transistor to be turned on.
6. The wireless temperature measurement system of claim 4, wherein the first transistor is a PNP type triode, the first end of the PNP type triode is an emitter, the second end of the PNP type triode is a collector, and the third end of the PNP type triode is a base; the second transistor is an enhanced NMOS field diode, the first end of the second transistor is a drain electrode, the second end of the second transistor is a source electrode, and the third end of the second transistor is a grid electrode.
7. The wireless thermometric system of claim 4, wherein the energy detection and switch unit further comprises a Zener diode, an anode of the Zener diode is coupled to the third terminal of the second transistor, and a cathode of the Zener diode is coupled to the junction of the first resistor and the second resistor.
8. The wireless thermometric system of claim 7, wherein the energy detection and switch unit further comprises a third resistor, one end of the third resistor is coupled to the junction of the second transistor and the Zener diode, and the other end of the third resistor is coupled to the junction of the second transistor and the second resistor.
9. The wireless temperature measurement system according to claim 1 or 4, wherein the power taking unit is a mutual inductance transformer, and the rectifying unit is provided with a bridge rectifier, a half-wave rectifier or a full-wave rectifier circuit; the temperature measuring unit is a temperature sensor, a thermistor or a thermocouple.
10. The wireless temperature measurement system of claim 1, further comprising a receiving end, wherein the receiving end is configured to receive the temperature measurement data and the interval time sent by the wireless communication and control unit, and is turned on or off according to the received interval time.
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