CN118010184A - Wireless temperature sensor circuit - Google Patents
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Abstract
The invention discloses a wireless temperature measurement sensor circuit, wherein an electric energy conversion module is electrically connected with low-voltage low-power energy to convert an electric energy voltage value into a rated working voltage value of a sensor; the energy storage control module is electrically connected with the electric energy conversion module to output electric energy, the electric energy is stored by the energy storage element, a control circuit is built to control the charge and discharge of the energy storage element, and the energy storage control module comprises the energy storage element and a control circuit for controlling the charge and discharge of the energy storage element; the temperature measuring module is connected with the energy storage control module and comprises a PT1000 platinum resistor and a 1KΩ bias resistor; the micro-processing unit is electrically connected with the energy storage control module and comprises an ADC controller for acquiring and processing sensor temperature data and input voltage data; the wireless communication module is electrically connected with the energy storage control module and the microprocessor unit, and is connected with the receiving end wireless communication module for timing wireless communication; the photoelectric awakening module is connected with the wireless communication module to awaken the wireless communication module from outside.
Description
Technical Field
The invention relates to the technical field of temperature sensor circuits, in particular to a wireless temperature sensor circuit.
Background
The wireless sensor network plays an important role in improving information connection for a control system in the industrial automation process, and has wide application prospect along with the improvement of the whole industrial level in China. The wireless sensor network system is very suitable for data acquisition of medium-and-long-term industrial environments of the Internet of things, so that the wireless sensor network system also becomes a key point of research in industrial intelligence.
Wireless sensor systems are evolving towards digitization, integration, micro-power consumption, miniaturization, with the lowest power of some sensing devices already being able to achieve microwatts, while the volume is only on-chip. With the rapid increase of the number of the sensor devices, the conventional power supply mode and the complicated wiring of the sensor can influence the normal operation of industrial equipment. Moreover, there are many times when the cable power is used because good electrical isolation between the power supply cable portion and the portion of the power equipment of the sensor is difficult to establish, and there are great drawbacks in using the cable for power supply, and if the flexibility of installing the sensing equipment is poor, it is also unfavorable for adding equipment in a later stage. The wireless sensor is powered by a built-in battery in the simplest and common non-wiring energy supply mode, the disadvantage of the mode is obvious, the battery is exhausted, the replacement and maintenance of a large number of batteries are very troublesome problems, and meanwhile, the environment pollution is aggravated by using a large number of batteries. To overcome the cable and battery powered drawbacks, passive sensor technology is currently being studied in large numbers.
In recent years, new sensor self-powered technologies are vigorous, and the new sensor self-powered technologies realize collection of environmental micro-energy by designing new materials and structures to supply power to the sensor, and are the most promising technologies for solving the power supply of the energy internet sensor, such as friction nano power generation, thermoelectric power generation, solar power generation, piezoelectric energy taking, environmental electromagnetic energy collection and the like. By utilizing the energy, the current self-powered technology has some applications in the aspects of wireless sensor network power supply and Internet of things technology, solves the problems of difficult wiring of a traditional sensor cable and difficult battery replacement, and lays a foundation for industrial intellectualization. In contrast, however, this technique has the problem of low output power and low output voltage, which also places demands on the construction of self-powered wireless sensor systems: the wireless sensor system satisfies wireless transmission and the overall power consumption of the sensor is low; the adaptability to different working conditions is strong; the flexibility of the industrial application of the system is improved. It is therefore desirable to design a low voltage, low power energy powered wireless temperature sensor circuit.
The information disclosed in the background section is only for enhancement of understanding of the background of the invention and therefore may contain information that does not form the prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
Aiming at the defects or drawbacks existing in the prior art, the wireless temperature measurement sensor circuit is provided, a circuit system aiming at low voltage and low power input characteristics is designed by utilizing an electric energy conversion and energy storage control technology to boost, store energy, control and the like on electric energy collected by the environment, so that the utilization rate of energy is improved, and finally the wireless temperature measurement function is realized.
The aim of the invention is achieved by the following technical scheme.
A wireless temperature sensor circuit comprising a circuit for detecting the temperature of a patient,
The electric energy conversion module is electrically connected with low-voltage low-power energy which is energy with voltage value of 130mV to 3V and power of 0.01mW to 300mW and converts the electric energy voltage value of the electric energy conversion module into the rated working voltage value of the sensor, and comprises a boosting chip for providing a boosting function and a peripheral circuit of the boosting chip;
the energy storage control module is electrically connected with the electric energy conversion module to output electric energy, the electric energy is stored by the energy storage element, a control circuit is built to control the charge and discharge of the energy storage element, and the energy storage control module comprises the energy storage element and a control circuit for controlling the charge and discharge of the energy storage element;
the temperature measurement module is connected with the energy storage control module and comprises a PT1000 platinum resistor and a 1KΩ bias resistor;
The micro-processing unit is electrically connected with the energy storage control module and comprises an ADC controller for acquiring and processing sensor temperature data and input voltage data;
The wireless communication module is electrically connected with the energy storage control module and the micro-processing unit, and is connected with the receiving end wireless communication module for timing wireless communication;
And the photoelectric awakening module is connected with the wireless communication module to awaken the wireless communication module from outside.
In the wireless temperature sensor circuit, the lowest value of the input voltage of low-voltage low-power energy is marked as V in_min, the lowest value of the input energy is marked as P in_min, the power of the input energy is marked as P in, the open-circuit voltage of the input energy is marked as V oc, and when the voltage is V oc≥Vin_min and P in≥Pin_min, the electric energy conversion module performs boosting processing through a boosting chip.
In the wireless temperature measurement sensor circuit, the voltage-boosting chip controls the input voltage of the electric energy conversion module to be in fixed proportion to the open-circuit voltage Voc by adjusting the voltage-dividing resistor at the input end, and the output voltage value of the voltage-boosting chip is programmed and set through the peripheral circuit, and the voltage setting range is 2.5V to 5.25V.
In the wireless temperature measurement sensor circuit, the energy storage element comprises a lithium ion capacitor, and when the voltage value of the energy storage element is lower than the minimum value of a set voltage threshold, the energy storage element is charged and power supply is disconnected; when the voltage value of the energy storage element is higher than the minimum value of the set voltage threshold and lower than the maximum value of the set voltage threshold, the energy storage element is charged and simultaneously supplies power; when the voltage value of the energy storage element is higher than the set voltage threshold maximum value, the energy storage element is disconnected from charging and is powered.
In the wireless temperature measurement sensor circuit, the micro-processing unit comprises an 8051 single chip microcomputer, wherein the 8051 single chip microcomputer uses a multi-channel ADC controller to collect temperature data and voltage data, packages the temperature data and the voltage data, sends the temperature data and the voltage data to the wireless communication module, and controls dormancy and awakening of the wireless communication module.
In the wireless temperature measurement sensor circuit, two I/O ports of the micro-processing unit are connected to two ends of the PT1000 platinum resistor, and the ADC controller is used for reading the voltage of the two ports, so that PT1000 platinum resistor temperature data are obtained.
In the wireless temperature measurement sensor circuit, the ADC controller is utilized to directly read the input voltage of the electric energy conversion module to judge the condition of the input energy of the sensor, if the minimum input condition is met, the wireless temperature measurement sensor circuit works at a set frequency, and if the minimum input condition is not met, the wireless temperature measurement sensor circuit is in a low-frequency state until the wireless temperature measurement sensor circuit is powered off.
In the wireless temperature measurement sensor circuit, the photoelectric wake-up module wakes up at fixed time to enable the wireless communication module to work in a fixed frequency state, and after signals are sent, the wireless communication module works in a sleep mode, and at the moment, the temperature measurement circuit is disconnected through the I/O port and the MOS tube.
In the wireless temperature measurement sensor circuit, a photoelectric wake-up module divides voltage by using a photoelectric triode and an I/O port pull-down resistor, and when the light intensity is lower than a light intensity threshold value, the wireless communication module is in a dormant state; and when the light intensity is higher than the light intensity threshold value, the wireless communication module wakes up.
In the wireless temperature measurement sensor circuit, when illumination is not used for waking up, the static current of the wireless temperature measurement sensor circuit is recorded as I Q, the wireless communication module is woken up after the illumination by an external light source, the current in the wake-up state is recorded as I W, the consumed power in the wake-up state is recorded as P W, the sensor enters a sleep state after data are transmitted, the current in the sleep state is I S, the consumed power in the sleep state is recorded as P S, the working period of the sensor is T, the wake-up time is the constant frequency work of T W, the average value of P S and P W in time is recorded as P AVG, the output power of the energy supply module is recorded as P in, the wireless temperature measurement sensor circuit keeps the working period to be T under the condition of open circuit voltage V oc≥Vin_min and P AVG≤Pin, the constant frequency work of T W is recorded by the wake-up time, meanwhile, the energy storage module stores the residual energy, and supplies energy to the wireless temperature measurement sensor circuit continuously when the energy input is lost.
Compared with the prior art, the invention has the beneficial effects that:
The invention provides electric energy for the temperature measurement wireless sensor by using electric energy conversion and energy storage control technology through energy collected by industrial field environment. For the energy with the voltage value of more than or equal to 130mV and less than or equal to 3V and the output power of more than or equal to 0.01mW and less than or equal to 300mW, the rated voltage can be converted into 2.2V to 5.25V and stored by the energy storage element. The control circuit can ensure that the sensor realizes fixed frequency work through charge and discharge and low power consumption design, namely, the multichannel temperature measurement acquisition of the platinum resistor and the ZigBee wireless communication function are realized. In particular, the input energy is monitored and the sensor operating frequency is appropriately adjusted based on the input energy conditions. In addition, the sensor can also wake up through an external light source when working in a dormant state. Tests show that under the input conditions that the open-circuit voltage is 150mV to 3V and the input power is 0.5mW to 2.8mW, the sensor can realize the constant-frequency operation for 10 minutes. The sensor circuit can support the normal working cycle for more than 50 ten thousand times, and the service life can exceed 10 years. In summary, the circuit is suitable for various energy collection scenes, and provides a new scheme for improving the applicability and flexibility of the self-powered sensor in an industrial environment.
The description is merely an overview of the technical solutions of the present invention, in order to make the technical means of the present invention more clearly apparent to those skilled in the art, and in order to make the description of the present invention and other objects, features and advantages of the present invention more obvious, the following description of the specific embodiments of the present invention will be exemplified.
Drawings
Various other advantages and benefits of the present invention will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. It is evident that the figures described below are only some embodiments of the invention, from which other figures can be obtained without inventive effort for a person skilled in the art. Also, like reference numerals are used to designate like parts throughout the figures.
In the drawings:
FIG. 1 is a schematic diagram of a tin through structure of a wireless temperature sensor circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an electrical energy conversion module of a wireless temperature sensor circuit according to an embodiment of the present invention;
FIG. 3 is a voltage waveform diagram of a control signal of an energy storage control module of a wireless temperature sensor circuit according to an embodiment of the present invention;
FIG. 4 is a comparison chart of temperature measurement results of a temperature measurement module of a wireless temperature measurement sensor circuit according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a sensor current waveform of a wireless temperature sensor circuit according to an embodiment of the present invention.
The invention is further explained below with reference to the drawings and examples.
Detailed Description
Specific embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While specific embodiments of the invention are shown in the drawings, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will understand that a person may refer to the same component by different names. The description and claims do not identify differences in terms of components, but rather differences in terms of the functionality of the components. As used throughout the specification and claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description hereinafter sets forth a preferred embodiment for practicing the invention, but is not intended to limit the scope of the invention, as the description proceeds with reference to the general principles of the description. The scope of the invention is defined by the appended claims.
For the purpose of facilitating an understanding of the embodiments of the invention, reference will now be made to the drawings of several embodiments illustrated in the drawings, and the accompanying drawings are not to be taken as limiting the embodiments of the invention.
For better understanding, as shown in fig. 1-5, a wireless temperature sensor circuit includes,
The electric energy conversion module is electrically connected with low-voltage low-power energy which is energy with voltage value of 130mV to 3V and power of 0.01mW to 300mW and converts the electric energy voltage value of the electric energy conversion module into the rated working voltage value of the sensor, and comprises a boosting chip for providing a boosting function and a peripheral circuit of the boosting chip;
the energy storage control module is electrically connected with the electric energy conversion module to output electric energy, the electric energy is stored by the energy storage element, a control circuit is built to control the charge and discharge of the energy storage element, and the energy storage control module comprises the energy storage element and a control circuit for controlling the charge and discharge of the energy storage element;
the temperature measurement module is connected with the energy storage control module and comprises a PT1000 platinum resistor and a 1KΩ bias resistor;
The micro-processing unit is electrically connected with the energy storage control module and comprises an ADC controller for acquiring and processing sensor temperature data and input voltage data;
The wireless communication module is electrically connected with the energy storage control module and the micro-processing unit, and is connected with the receiving end wireless communication module for timing wireless communication;
And the photoelectric awakening module is connected with the wireless communication module to awaken the wireless communication module from outside.
In the preferred embodiment of the wireless temperature sensor circuit, the lowest value of the input voltage of the low voltage and low power energy is denoted as V in_min, the lowest value of the input energy is denoted as P in_min, the power of the input energy is denoted as P in, the open circuit voltage of the input energy is denoted as V oc, and the power conversion module performs boosting processing through the boosting chip at the time of V oc≥Vin_min and P in≥Pin_min.
In the preferred embodiment of the wireless temperature sensor circuit, the voltage-boosting chip controls the input voltage of the electric energy conversion module to be in a fixed proportion with the open-circuit voltage Voc by adjusting the voltage-dividing resistor at the input end, and the output voltage value of the voltage-boosting chip is programmed and set through the peripheral circuit, and the voltage setting range is 2.5V to 5.25V.
In a preferred embodiment of the wireless temperature sensor circuit, the energy storage element comprises a lithium ion capacitor, and when the voltage value of the energy storage element is lower than a set voltage threshold minimum value, the energy storage element is charged and power supply is disconnected; when the voltage value of the energy storage element is higher than the minimum value of the set voltage threshold and lower than the maximum value of the set voltage threshold, the energy storage element is charged and simultaneously supplies power; when the voltage value of the energy storage element is higher than the set voltage threshold maximum value, the energy storage element is disconnected from charging and is powered.
In the preferred embodiment of the wireless temperature sensor circuit, the micro-processing unit comprises an 8051 single chip microcomputer, which uses a multi-channel ADC controller to collect temperature data and voltage data, packages and sends the temperature data and the voltage data to the wireless communication module, and controls dormancy and awakening of the wireless communication module.
In the preferred embodiment of the wireless temperature sensor circuit, two I/O ports of the micro-processing unit are connected to two ends of the PT1000 platinum resistor, and the ADC controller is used for reading the voltage of the two ports, so that PT1000 platinum resistor temperature data are obtained.
In the preferred embodiment of the wireless temperature sensor circuit, the ADC controller is used to directly read the input voltage of the electric energy conversion module to determine the condition of the sensor input energy, if the lowest input condition is met, the wireless temperature sensor circuit works at the set frequency, and if the lowest input condition is not met, the wireless temperature sensor circuit is in the low frequency state until the wireless temperature sensor circuit is powered off.
In the preferred embodiment of the wireless temperature measurement sensor circuit, the photoelectric wake-up module wakes up at fixed time to enable the wireless communication module to work in a fixed frequency state, and after signals are sent, the wireless communication module works in a sleep mode, and at the moment, the temperature measurement circuit is disconnected through the I/O port and the MOS tube.
In the preferred embodiment of the wireless temperature sensor circuit, the photoelectric wake-up module uses a photoelectric triode and an I/O port pull-down resistor to divide voltage, and when the light intensity is lower than a light intensity threshold value, the wireless communication module is in a dormant state; and when the light intensity is higher than the light intensity threshold value, the wireless communication module wakes up.
In the preferred embodiment of the wireless temperature sensor circuit, when no illumination is used for waking up, the quiescent current of the wireless temperature sensor circuit is marked as I Q, the wireless communication module is woken up after being irradiated by an external light source, the current in the woken-up state is marked as I W, the power consumed in the woken-up state is marked as P W, the sensor enters a dormant state after sending data, the dormant state current is marked as I S, the power consumed in the dormant state is marked as P S, the working period of the sensor is marked as T, the wake-up time is the constant frequency work of T W, the average value of the time of P S and P W is marked as P AVG, the output power of the energy supply module is marked as P in, the wireless temperature sensor circuit keeps the working period as T under the condition of open circuit voltage V oc≥Vin_min and P AVG≤Pin, the wake-up time is marked as T W, meanwhile, the energy storage module stores the rest energy, and supplies power to the wireless temperature sensor circuit continuously when the energy input is lost.
In one embodiment, the optoelectronic wake-up module uses a phototransistor and a pull-down resistor internal to the I/O port to divide the voltage. The debugging stage can use external light source to illuminate, and uses phototriode to implement the conversion of optical signal into electric signal, and uses photoelectric awakening module to awaken wireless communication module from dormancy. When the light intensity is weaker, the phototriode presents a high resistance value, the voltage value of the I/O port is lower than the logic 0 voltage threshold value of the singlechip, the input of the I/O port is low level, and the wireless communication module is in a dormant state; when the light intensity is strong, the phototriode presents a low resistance value, the voltage value of the I/O port is higher than the logic 1 voltage threshold value of the singlechip, the input of the I/O port is high level, and the wireless communication module is triggered to wake up.
In one embodiment, the low-voltage low-power electric energy at the input end is connected with an electric energy conversion module to convert the energy voltage value into a rated working voltage value of the sensor and store the electric energy through being connected with an energy storage control module. The energy storage control module is used for comparing the voltage value of the energy storage element with a programmable control signal voltage threshold value to realize the charge and discharge control of the energy storage element. The control link avoids the over-discharge and over-charge of the energy storage element and realizes the power supply of the sensor. The temperature measurement module comprises a PT1000 platinum resistor and a 1KΩ bias resistor. The micro-processing unit mainly comprises an ADC controller and is responsible for collecting and processing sensor temperature data and input voltage data. The wireless communication frequency can be properly adjusted according to the input voltage conversion. The wireless communication module is in wireless connection with the receiving end and sends information such as sensor numbers, positions and temperatures. In addition, the photoelectric awakening module can be irradiated by an external light source so as to awaken the wireless communication module. The circuit system supports the normal working cycle for more than 50 ten thousand times, and the service life can exceed 10 years.
In one embodiment, the wireless temperature sensor circuit comprises,
The electric energy conversion module is electrically connected with the low-voltage low-power energy and converts the electric energy voltage value into a rated working voltage value of the sensor, and mainly comprises a boosting chip and a peripheral circuit thereof, wherein the boosting chip provides a boosting function;
The energy storage control module is electrically connected with the electric energy conversion module to output electric energy, the electric energy is stored by the energy storage element, a control circuit is built to control the charge and discharge of the energy storage element, and the energy storage control module mainly comprises the energy storage element and the control circuit;
the temperature measurement module mainly comprises a PT1000 platinum resistor and a 1KΩ bias resistor, and the energy storage element provides current.
The micro-processing unit is electrically connected with the energy storage control module to output electric energy, and mainly utilizes the ADC controller to collect and process sensor temperature data and input voltage data and control the wireless communication module to send data;
And the wireless communication module is electrically connected with the energy storage control module and the micro-processing unit, is connected with the receiving end wireless communication module, and is used for sending information such as temperature data and the like in a timing wireless manner.
And the photoelectric awakening module is used for externally awakening the wireless communication module.
The wireless temperature sensor circuit powered by low-voltage low-power energy can boost the energy with the voltage value of more than or equal to 130mV and less than or equal to 3V and the output power of more than 0.01mW and less than or equal to 300mW through the electric energy conversion module. The module integrates a Maximum Power Point Tracking (MPPT) function, and indirectly modulates the equivalent input impedance of the boost chip by monitoring the input voltage of the VIN_DC pin to adjust the sampling reference voltage VREF_SAMP. In the use process, the MPPT circuit can periodically detect the open-circuit value VOC of the input voltage to obtain a new reference voltage at intervals, so that the dynamic optimization of the input power can be ensured. As shown in fig. 2, the reference voltage vref_samp of the MPPT circuit can be adjusted by adjusting the resistance values of R 1 and R 2, and the expression is:
for solar power, the maximum power point is about 70-80% of the open circuit voltage. For temperature-differential power, the maximum power point is about 50% of the open circuit voltage. Therefore, the circuit can be suitable for various field energy collection scenes such as temperature difference power supply, solar power supply and the like. As shown in fig. 2, the over-voltage vbat_ov threshold level can be adjusted by setting the resistance values of the peripheral circuit resistors R 3 and R 4. This is also the steady voltage value output by the power conversion module. The vbat_ov threshold has the expression:
wherein VBIAS is the voltage node of the programmable voltage threshold reference, fluctuating between 1.21V to 1.27V. For the nominal operating voltage of the sensor circuit, vbat_ov has a value of 3.3V.
The wireless temperature sensor circuit powered by low-voltage low-power energy stores the output electric energy of the electric energy conversion module through an energy storage element in the energy storage control module. Wherein the energy storage element uses a lithium ion capacitor. Compared with a common super capacitor, the capacitor has the advantages of higher energy density, better self-discharge characteristic and longer cycle life. The control circuit can avoid the problem of overcharge and overdischarge of the energy storage element, and compares and judges the voltage value of the energy storage element with the voltage threshold value which is set in a programmable mode. As shown in fig. 2, the control circuit uses the vbat_ok signal as a control signal for controlling the charge and discharge of the energy storage element to be turned on and off. In circuit operation, there are three cases: when the voltage value of the energy storage element is lower than the minimum value of the set voltage threshold, the energy storage element is charged, the VBAT_OK signal presents a low level, the signal controls the MOS tube circuit to be disconnected, and the energy storage element is disconnected electrically with the sensor system at the moment; when the voltage value of the energy storage element is higher than the minimum value of the set voltage threshold and lower than the maximum value of the set voltage threshold, the energy storage element is charged, a VBAT_OK signal presents a high level, the signal controls the MOS tube circuit to be opened, and the energy storage element supplies power for the sensor system; when the voltage value of the energy storage element is higher than the maximum value of the set voltage threshold, the VBAT_OK signal still presents a high level, and the energy storage element supplies power for the sensor system. But at this time the voltage value of the energy storage element has exceeded the vbat_ov threshold, and the energy storage element is then disconnected from charging, avoiding damage to the energy storage element and the sensor circuit due to overcharging. When the storage element voltage drops, the threshold vbat_ok_prog expression is:
when the storage element voltage rises, the threshold value vbat_ok_hyst expression is:
the hysteresis characteristic between the vbat_ok signal and the output voltage is shown in fig. 3.
The micro-processing unit of the wireless temperature measurement sensor circuit powered by low voltage and low power energy uses an 8051 singlechip, and has the main functions of: acquiring temperature data and voltage data by using a multi-channel ADC controller; processing and packaging the acquired signals and sending the processed and packaged acquired signals to a wireless communication module; and controlling dormancy and awakening of the wireless communication module, wherein the awakening mode comprises two modes of timed awakening and external awakening.
The temperature measuring module of the wireless temperature measuring sensor circuit powered by low voltage and low power energy comprises a PT1000 platinum resistor and a 1KΩ bias resistor. The energy storage element provides current for the temperature measuring resistor, two I/O ports of the micro-processing unit are connected to two ends of the platinum resistor, and the voltage of the two ports is read by the internal ADC controller, so that platinum resistor temperature data are obtained. The three-way temperature measurement result of the invention is compared with the data of a commercial temperature measurement instrument, and the comparison result is shown in fig. 4. The comparison shows that the temperature measurement precision of the sensor circuit can reach +/-1 ℃ within the range of 30-100 ℃.
The input power of the low-voltage low-power energy-powered wireless temperature measurement sensor circuit is lower than the rated power of the sensor, so that the micro-processing unit is required to control the intermittent operation of the temperature measurement module and the wireless communication module. The wireless communication module works in a fixed frequency state through timing awakening. After the signal is sent, the wireless communication module works in a sleep mode, and the temperature measuring circuit is disconnected through the I/O port and the MOS tube, so that the power consumption of a circuit system can be reduced, and the energy utilization rate is improved.
In practical use, the sensor system may lose input energy. And the ADC controller in the micro-processing unit is used for directly reading the input voltage of the electric energy conversion module, so that the input energy condition of the sensor can be judged. If the minimum input condition is met, the sensor system operates at the set frequency. And if the minimum input condition is not met, the sensor system works in a low-frequency state until the sensor system is powered off.
The wireless communication module in the wireless temperature sensor circuit powered by low voltage and low power energy adopts a ZigBee communication chip carrying a CC2530 radio frequency chip to support a ZigBee3.0 communication protocol. The wireless communication module may transmit a beacon signal prior to connection. And the wireless data is transmitted after being connected with the receiving end communication module, and mainly comprises information such as sensor numbers, positions, temperatures and the like. The invention aims at the use scene of low-power, medium-long distance wireless transmission, so the ZigBee wireless communication mode is used for data transmission. In particular, different wireless transmission modes may be used for different application requirements, for example: lora, bluetooth, NBIoT, etc.
The low-voltage low-power energy-powered wireless temperature measurement sensor circuit can use an external light source to irradiate in a debugging stage, and the wireless communication module is awakened from dormancy through the photoelectric awakening module. The photoelectric wake-up module uses a photoelectric triode and an I/O port pull-down resistor to divide voltage. When the light intensity is weak, the phototriode presents a high resistance value, the voltage value of the I/O port is low, and the wireless communication module is in a dormant state; when the light intensity is strong, the phototriode presents a low resistance value, the voltage value of the I/O port is high at the moment, and the wireless communication module wakes up.
The current waveform diagram of the wireless temperature sensor circuit powered by low voltage and low power energy is shown in fig. 5. The working voltage of the wireless communication module is recorded as U O, the beacon connection signal current is recorded as I B, the current value of the sensor in the wake-up working state is recorded as I W, the current in the sleep state is recorded as I Q, and the power P 1 consumed by the sensor in the wake-up state is as follows:
P1＝UOIW
when the sensor is in the sleep state, the power P 2 consumed is:
P2＝UOIQ
Let the duty cycle of the sensor be T and the wake-up time in one duty cycle be T W, then the average power consumed by the sensor P AVG is:
The output power of the electric energy conversion module is recorded as P O, when the output power of the electric energy conversion module is larger than the average power P AVG consumed by the sensor, the sensor can keep the working period to be T, the wake-up time is T W, the fixed frequency work is carried out, meanwhile, the energy storage module can store the residual energy, and when the energy input is lost, the energy continues to be supplied to the sensor module.
In order to verify that the wireless temperature measurement sensing device can normally perform wireless temperature measurement sensing under the condition of low-voltage and low-power energy power supply input, the device is subjected to experimental verification, wherein parameters are configured as follows: setting the resistance values of R 1、R2 to be 10MΩ, and setting the MPPT voltage dividing ratio to be about 50%; the resistance values of R 7、R8 and R 9 are set to 3.9 M.OMEGA, 6.2 M.OMEGA.and 0.16 K.OMEGA.and the value of VBAT_OK_PROG is about 3.197V and the value of VBAT_OK_HYST is about 3.268V, respectively; setting the resistance of R 5、R6 to be 4.3W omega and 5.6M omega respectively, and the value of VBAT_UV is about 3.075V; setting the resistance of R 3、R4 to be 4.7MΩ and 5.1MΩ, respectively, and the value of VBAT_OV is about 3.550V; inductor L 1 has an inductance of about 22uH and an internal resistance of about 168mΩ; the capacitance of the capacitor C 1、C3、C5 is 4.7 mu F, 4.7 mu F and 100 mu F respectively; capacitor C 4 is a lithium ion capacitor with an equivalent capacity of 10F. The wireless communication module selects a CC2530 chip of the Zigbee protocol. Tested: the beacon connection signal current value is about 27.4mA, the wireless signal current value is about 8mA to 11.4mA after connection, and the dormant state current is 1.12 mu A to 2 mu A. Under the input condition that the open circuit voltage is 150mV to 1V and the input power is 0.5mW to 125mW, the sensor can realize the working period of 10min and the fixed frequency work with the wake-up time of 3s in one period. Under this condition, the voltage of the two ports is read by the controller of the ADC inside the CC2530, thereby acquiring platinum resistance temperature data. The temperature test result of the invention is compared with the data of a commercial temperature measuring instrument, and the comparison result is shown in fig. 4. The comparison shows that the temperature measurement precision of the sensor circuit can reach +/-1 ℃ within the range of 30-100 ℃.
The basic principles of the present application have been described above in connection with specific embodiments, but it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are merely examples and not intended to be limiting, and these advantages, benefits, effects, etc. are not to be construed as necessarily possessed by the various embodiments of the application. Furthermore, the specific details disclosed herein are for purposes of illustration and understanding only, and are not intended to be limiting, as the application is not necessarily limited to practice with the above described specific details.
The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit embodiments of the application to the form disclosed herein. Although a number of example aspects and embodiments have been discussed above, a person of ordinary skill in the art will recognize certain variations, modifications, alterations, additions, and subcombinations thereof.
Claims (9)
1. A wireless temperature sensor circuit is characterized in that the circuit comprises,
The electric energy conversion module is electrically connected with low-voltage low-power energy which is energy with voltage value of 130mV to 3V and power of 0.01mW to 300mW and converts the electric energy voltage value of the electric energy conversion module into the rated working voltage value of the sensor, and comprises a boosting chip for providing a boosting function and a peripheral circuit of the boosting chip;
the energy storage control module is electrically connected with the electric energy conversion module to output electric energy, the electric energy is stored by the energy storage element, a control circuit is built to control the charge and discharge of the energy storage element, and the energy storage control module comprises the energy storage element and a control circuit for controlling the charge and discharge of the energy storage element;
the temperature measurement module is connected with the energy storage control module and comprises a PT1000 platinum resistor and a 1KΩ bias resistor;
The micro-processing unit is electrically connected with the energy storage control module and comprises an ADC controller for acquiring and processing sensor temperature data and input voltage data;
The wireless communication module is electrically connected with the energy storage control module and the micro-processing unit, and is connected with the receiving end wireless communication module for timing wireless communication;
And the photoelectric awakening module is connected with the wireless communication module to awaken the wireless communication module from outside.
2. The wireless temperature sensor circuit of claim 1, wherein preferably, the lowest value of the input voltage of the low voltage and low power energy is denoted as V in_min, the lowest value of the input energy is denoted as P in_min, the power of the input energy is denoted as P in, the open circuit voltage of the input energy is denoted as V oc, and the power conversion module performs a boosting process through the boosting chip at the time of V oc≥Vin_min and P in≥Pin_min.
3. The wireless temperature sensor circuit according to claim 1, wherein the voltage-boosting chip controls the input voltage of the power conversion module to be in a fixed proportion to the open-circuit voltage Voc by adjusting the voltage-dividing resistance of the input end, and the output voltage value of the voltage-boosting chip is programmed and set by the peripheral circuit, and the voltage setting range is 2.5V to 5.25V.
4. The wireless temperature sensor circuit of claim 1, wherein the energy storage element comprises a lithium ion capacitor, the energy storage element charging and disconnecting power when the energy storage element voltage value is below a set voltage threshold minimum value; when the voltage value of the energy storage element is higher than the minimum value of the set voltage threshold and lower than the maximum value of the set voltage threshold, the energy storage element is charged and simultaneously supplies power; when the voltage value of the energy storage element is higher than the set voltage threshold maximum value, the energy storage element is disconnected from charging and is powered.
5. The wireless temperature sensor circuit of claim 1, wherein the microprocessor unit comprises an 8051 single-chip microcomputer that uses a multi-channel ADC controller to collect temperature data and voltage data and package and send to the wireless communication module, and to control sleep and wake-up of the wireless communication module.
6. The wireless temperature sensor circuit of claim 1, wherein two I/O ports of the micro-processing unit are connected to two ends of the PT1000 platinum resistor, and the ADC controller is used to read the voltages of the two ports, thereby obtaining PT1000 platinum resistor temperature data.
7. The wireless temperature sensor circuit of claim 1, wherein the ADC controller is configured to directly read the input voltage of the power conversion module to determine the sensor input energy condition, and if the minimum input condition is met, the wireless temperature sensor circuit operates at the set frequency, and if the minimum input condition is not met, the wireless temperature sensor circuit is in a low frequency state until the wireless temperature sensor circuit is powered off.
8. The wireless temperature sensor circuit of claim 1, wherein the optoelectronic wake-up module wakes up at regular time to enable the wireless communication module to operate in a fixed frequency state, and after the signal is sent, the wireless communication module operates in a sleep mode, and at the moment, the temperature measuring circuit is disconnected through the I/O port and the MOS tube.
9. The wireless temperature sensor circuit of claim 8, wherein the optoelectronic wake-up module uses a phototransistor and an I/O port pull-down resistor to divide the voltage, and the wireless communication module is in a sleep state when the light intensity is lower than a light intensity threshold; and when the light intensity is higher than the light intensity threshold value, the wireless communication module wakes up.
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| CN202410168241.0A CN118010184A (en) | 2024-02-06 | 2024-02-06 | Wireless temperature sensor circuit |
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