CN110912399B - Time domain power supply system of temperature sensor - Google Patents
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- CN110912399B CN110912399B CN201911268015.5A CN201911268015A CN110912399B CN 110912399 B CN110912399 B CN 110912399B CN 201911268015 A CN201911268015 A CN 201911268015A CN 110912399 B CN110912399 B CN 110912399B
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- 239000003990 capacitor Substances 0.000 claims abstract description 50
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 12
- 230000001012 protector Effects 0.000 claims abstract description 7
- 230000001105 regulatory effect Effects 0.000 claims abstract description 4
- 238000012937 correction Methods 0.000 claims description 18
- 238000004146 energy storage Methods 0.000 claims description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001629 suppression Effects 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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Abstract
The invention discloses a time domain power supply system of a temperature sensor, which comprises: the auxiliary expansion circuit consists of a switching tube, a load resistor, a lower limit correcting resistor and a gain resistor; the power supply compensation circuit consists of a linear compensation resistor, an integral compensation network, a current converter, a voltage converter, a linear amplifier and a current source; the power supply voltage adjusting circuit consists of a primary unidirectional capacitor, a voltage stabilizing adjuster and a secondary unidirectional capacitor; a reference voltage protection circuit comprising: the power supply comprises a regulating resistor, a voltage stabilizing diode, an over-current protector and a power supply gain circuit, wherein the power supply gain circuit consists of a filter, a primary feedback circuit, a secondary feedback circuit and a current source loop, and a better power supply rejection ratio can be obtained; the phase position of the power supply voltage of the power supply gain circuit is equal to the difference between the phase position of the output end of the primary feedback circuit and the phase position of the output end of the secondary feedback circuit, and the power supply gain circuit has good power supply suppression performance.
Description
Technical Field
The invention relates to the technical field of power supply, in particular to a time domain power supply system of a temperature sensor.
Background
The sensor is widely applied to the fields and departments of military affairs, aerospace, scientific research, industry, agriculture, medical treatment, traffic and the like, and has very wide application prospect. With the development of the intelligent concept of the sensor, people have higher and higher requirements on the sensor, particularly, the temperature sensor with the demand quantity at the head of the sensor is developing towards the temperature sensor, the high-precision and intelligent power supply of the temperature sensor is very important, and the invention patent with the application number of 201810484643.6 provides a self-powered temperature sensor, wherein the inner wall of the right side of a shell is connected with a power supply device, and the left side of the power supply device is electrically connected with a circuit board, so that self power supply is realized, and the energy consumption can be reduced, and the effects of energy conservation and environmental protection are achieved.
The power supply system of the current temperature sensor easily causes the sensor internal circuit to consume large power consumption, and the internal circuit resistance can bring measurement errors, so that the measurement precision is not high, the long-term development of the field of the sensor is not facilitated, the prior art can not meet the requirements of people at the current stage, and the prior art is urgently needed to be reformed based on the current situation.
Disclosure of Invention
The present invention is directed to a time domain power supply system for a temperature sensor, so as to solve the problems in the background art.
The invention provides a time domain power supply system of a temperature sensor, which comprises the following technical scheme:
the auxiliary expansion circuit consists of an RTD (resistance temperature sensor), a switching tube, a load resistor, a lower limit correction resistor and a gain resistor;
the input end of the RTD is connected with a load resistor which provides sampling voltage in series, the output end of the RTD is connected with a lower limit correction resistor which corrects input offset voltage in series, the lower limit correction resistor is connected with a gain resistor in series, the resistance value of the gain resistor is in direct proportion to extra common mode voltage output by the RTD, the resistance value of the lower limit correction resistor is set in direct proportion to the amplified gain of the gain resistor, the other end of the gain resistor is electrically connected with a switching tube, and the switching tube is provided with an emitting electrode which is connected with the gain resistor in series, a base electrode which is electrically connected with a power supply compensation circuit and a collecting electrode which is grounded and output;
the current input by the RTD is converted into a voltage signal through a series load resistor R1, the output loop current is measured through the voltage of a series load resistor R1, a current source excites the RTD, and the input current is amplified by an instrument amplifier to measure the potential difference between the RTD and a lower limit correction resistor R2.
The power supply compensation circuit consists of a linear compensation resistor, an integral compensation network, a current converter, a voltage converter, a linear amplifier and a current source;
the linear compensation resistor comprises a feedback resistor R4 and a bias resistor R5 which are connected in parallel, one end of the linear compensation resistor is electrically connected with the auxiliary expansion circuit, the other end of the linear compensation resistor is electrically connected with a current source, the current source provides a 15V alternating current power supply for the power compensation circuit, a primary LC filter circuit consisting of the inductor L1 and the capacitor C7 and a secondary filter circuit consisting of the resistor R8 and the filter capacitor C1 jointly form an integral compensation network, the 15V alternating current circuit is subjected to primary filtering through the LC filter circuit, and a direct current source is output after the secondary filtering through the filter capacitor;
a linear compensation resistor is used as an initial compensation end of a power supply compensation circuit, a feedback resistor R4 provides positive feedback for linearization, a bias R5 provides a bias offset current to compensate the resistance of a lead wire encountered by an RTD in a remote place, and R5 is connected with an RC circuit in series, wherein the capacitance is a filter capacitance of 150nF, so that the noise in a normal mode is reduced.
The power supply voltage adjusting circuit consists of a primary unidirectional capacitor, a voltage stabilizing adjuster and a secondary unidirectional capacitor;
the primary one-way capacitor is composed of capacitors connected in parallel with an RC circuit, reactive power of inductive load of the linear amplifier is compensated to improve power factor, the voltage regulator is composed of a diode and a resistor, 15V voltage provided by a power supply compensation circuit is converted into required 5V voltage, the secondary one-way capacitor is composed of two filter capacitors connected in parallel, filtering is further carried out on the output end of the circuit to reduce circuit impedance, voltage quality is improved, line loss is reduced, the primary one-way capacitor and the secondary one-way capacitor are symmetrically arranged at two ends of the voltage regulator to achieve low static current output, and interference of circuit noise is effectively restrained.
A reference voltage protection circuit comprising: the device comprises a regulating resistor, a voltage stabilizing diode and an over-current protector; the over-current protector is formed by connecting two diodes in parallel in different directions, and after the forward voltage passes through the voltage stabilizing diode, the conducting diode VD3 is grounded, so that the excessive voltage is prevented from continuously flowing through a subsequent circuit, and the circuit is protected from being burnt by the large voltage; the resistance value of the adjusting resistor R7 is variable, adjustment is carried out according to actual voltage requirements, the radio frequency collector stores collected energy in the capacitor C6, and the capacitor for storing energy is used for supplying power to the temperature sensor, so that the power supply voltage of the temperature sensor during working changes obviously, and a better power supply rejection ratio can be obtained.
The power supply gain circuit consists of a filter, a primary feedback circuit, a secondary feedback circuit and a current source loop; the filter is composed of a resistor R10 and a capacitor C7 in series, and the resistor R10, the capacitor C7 and the capacitor C8 form a filtering energy storage circuit,
the primary feedback circuit and the secondary feedback circuit are both provided with oscillators, and a feedback loop is formed between the two oscillators to realize low-frequency gain for the primary feedback circuit and the secondary feedback circuit. Therefore, the circuit is matched with low-frequency temperature detection, when the power supply voltage changes, the phase difference of the power supply voltage of the primary feedback circuit and the phase difference of the power supply voltage of the secondary feedback circuit are in direct proportion, the phase of the power supply voltage is equal to the difference between the phase of the output end of the primary feedback circuit and the phase of the output end of the secondary feedback circuit, namely if the phase of the output end of the primary feedback circuit is U1 and the phase of the output end of the secondary feedback circuit is U2, the phase difference U of the power supply voltage is U1-U2, therefore, the change of the power supply voltage does not actually affect the output phase, and the voltage of the output end of the primary feedback circuit and the voltage of the output end of the secondary feedback circuit have good power supply suppression performance.
Has the advantages that: the resistance value of a lower limit correction resistor R2 of the power conversion circuit is the lower limit resistance value of the RTD in the minimum temperature range, and the lower limit correction resistor R2 is adjusted to enable the current to output 10 milliamperes so as to correct mismatching of the input offset voltage and the reference current; the power supply compensation circuit is electrically connected to a 15V current source, the change of the resistance value of the linear compensation resistor is measured, and the resistance value of the gain resistor R2 is determined according to the common-mode voltage output by the RTD, so that the measurement error caused by a power supply compensation circuit line can be eliminated, secondary linear compensation can be performed on the RTD, and the linearity and the measurement precision of the temperature measurement system are improved; the power supply voltage adjusting circuit converts the 15V voltage provided by the power supply compensation circuit into the required 5V voltage, the secondary unidirectional capacitor is formed by connecting two filter capacitors in parallel, and the filter is further carried out on the output end of the circuit to reduce the circuit impedance, improve the voltage quality and reduce the line loss; the reference voltage protection circuit supplies power to the temperature sensor by using the capacitor for storing energy, so that the power supply voltage of the temperature sensor during working changes obviously, and a better power supply rejection ratio can be obtained; the phase position of the power supply voltage of the power supply gain circuit is equal to the difference between the phase position of the output end of the primary feedback circuit and the phase position of the output end of the secondary feedback circuit, and the power supply gain circuit has good power supply suppression performance.
Drawings
FIG. 1 is a schematic diagram of an auxiliary expansion circuit of the power conversion circuit of the present invention;
FIG. 2 is a power compensation circuit diagram of the power conversion circuit of the present invention;
FIG. 3 is a circuit diagram of a power supply voltage adjusting circuit of the power conversion circuit of the present invention;
FIG. 4 is a diagram of a reference voltage protection circuit according to the present invention;
FIG. 5 is a power gain circuit diagram according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the invention without making any creative effort, shall fall within the protection scope of the invention.
Referring to fig. 1, the invention provides a time domain power supply system of a temperature sensor according to the following technical solution, including a power conversion circuit including: the auxiliary expansion circuit, the power supply compensation circuit and the power supply voltage adjusting circuit;
the auxiliary expansion circuit consists of an RTD (resistance temperature sensor), a switching tube, a load resistor, a lower limit correction resistor and a gain resistor;
the input end of the RTD is connected with a load resistor which provides sampling voltage in series, the output end of the RTD is connected with a lower limit correction resistor which corrects input offset voltage in series, the lower limit correction resistor is connected with a gain resistor in series, the resistance value of the gain resistor is in direct proportion to extra common mode voltage output by the RTD, the resistance value of the lower limit correction resistor is set in direct proportion to the amplified gain of the gain resistor, the other end of the gain resistor is electrically connected with a switching tube, and the switching tube is provided with an emitting electrode which is connected with the gain resistor in series, a base electrode which is electrically connected with a power supply compensation circuit and a collecting electrode which is grounded and output;
the current input by the RTD is converted into a voltage signal through a series load resistor R1, the output loop current is measured through the voltage of a series load resistor R1, a current source excites the RTD, and the potential difference between the input measurement RTD and a lower limit correction resistor R2 is amplified through an instrument amplifier, wherein the resistance value of the lower limit correction resistor R2 is the lower limit resistance value of the RTD in the minimum temperature range, the current of 10 milliamperes of current output can be used for correcting the mismatching between the input offset voltage and the reference current by adjusting the lower limit correction resistor R2, meanwhile, the lower limit correction resistor R2 provides an extra common mode voltage for the RTD, and a gain resistor R3 is set according to the common mode voltage.
Referring to fig. 2, the power supply compensation circuit includes: the linear compensation resistor, the integral compensation network, the current converter, the voltage converter, the linear amplifier and the current source;
the linear compensation resistor comprises a feedback resistor R4 and a bias resistor R5 which are connected in parallel, one end of the linear compensation resistor is electrically connected with the auxiliary expansion circuit, the other end of the linear compensation resistor is electrically connected with a current source, the current source provides a 15V alternating current power supply for the power compensation circuit, a primary LC filter circuit consisting of the inductor L1 and the capacitor C7 and a secondary filter circuit consisting of the resistor R8 and the filter capacitor C1 jointly form an integral compensation network, the 15V alternating current circuit is subjected to primary filtering through the LC filter circuit, and a direct current source is output after the secondary filtering through the filter capacitor;
a linear compensation resistor is used as an initial compensation end of a power supply compensation circuit, a feedback resistor R4 provides positive feedback for linearization, a bias R5 provides a bias offset current to compensate the resistance of a lead wire encountered by an RTD in a remote place, and R5 is connected with an RC circuit in series, wherein the capacitance is a filter capacitance of 150nF, so that the noise in a normal mode is reduced. The resistance value of the linear compensation resistor is measured through the current source electrically connected to 15V, the resistance value of the gain resistor R2 is determined according to the common-mode voltage output by the RTD, the measured resistance value is only related to the RTD and is not related to the resistance of the whole power supply compensation circuit, not only can the measurement error brought by a power supply compensation circuit be eliminated, but also the secondary linear compensation can be carried out on the RTD, and the linearity and the measurement precision of the temperature measurement system are improved.
Referring to fig. 3, the power supply voltage adjusting circuit includes a primary unidirectional capacitor, a regulator and a secondary unidirectional capacitor, the primary unidirectional capacitor includes an RC circuit connected in parallel with a capacitor to compensate the reactive power of the inductive load of the linear amplifier to improve the power factor, the regulator includes a diode and a resistor to convert the 15V voltage provided by the power supply compensating circuit into the required 5V voltage, the secondary unidirectional capacitor includes two filter capacitors connected in parallel to further filter the output of the circuit to reduce the circuit impedance, improve the voltage quality and reduce the line loss, the primary unidirectional capacitor and the secondary unidirectional capacitor are symmetrically disposed at two ends of the regulator to achieve low quiescent current output and effectively suppress the interference of the circuit noise.
Referring to fig. 4, the reference voltage protection circuit is provided with a regulating resistor, a voltage stabilizing diode and an over-current protector, wherein the over-current protector is formed by connecting two diodes in parallel in different directions, and after an excessive current passes through the voltage stabilizing diode, a forward voltage grounds a conducting diode VD3 to prevent the excessive voltage from continuously flowing through a subsequent circuit, so that the circuit is protected from being burnt by the large voltage; the resistance value of the adjusting resistor R7 is variable, adjustment is carried out according to actual voltage requirements, the radio frequency collector stores collected energy in the capacitor C6, and the capacitor for storing energy is used for supplying power to the temperature sensor, so that the power supply voltage of the temperature sensor during working changes obviously, and a better power supply rejection ratio can be obtained.
Referring to fig. 5, the power gain circuit is composed of a filter, a primary feedback circuit, a secondary feedback circuit, and a current source loop; the filter is formed by connecting a resistor R10 in series with a capacitor C7, and a filter energy storage circuit is formed by the resistor R10, the capacitor C7 and the capacitor C8;
the primary feedback circuit and the secondary feedback circuit are both provided with oscillators, and a feedback loop is formed between the two oscillators to realize low-frequency gain for the primary feedback circuit and the secondary feedback circuit. Therefore, the circuit is matched with low-frequency temperature detection, when the power supply voltage changes, the phase difference of the power supply voltage of the primary feedback circuit and the phase difference of the power supply voltage of the secondary feedback circuit are in direct proportion, the phase of the power supply voltage is equal to the difference between the phase of the output end of the primary feedback circuit and the phase of the output end of the secondary feedback circuit, namely if the phase of the output end of the primary feedback circuit is U1 and the phase of the output end of the secondary feedback circuit is U2, the phase difference U of the power supply voltage is U1-U2, therefore, the change of the power supply voltage does not actually affect the output phase, and the voltage of the output end of the primary feedback circuit and the voltage of the output end of the secondary feedback circuit have good power supply suppression performance.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (8)
1. A temperature sensor time domain power supply system, comprising:
the auxiliary expansion circuit consists of an RTD, a switching tube, a load resistor, a lower limit correction resistor and a gain resistor;
the input end of the RTD is connected in series with a load resistor which provides sampling voltage; and the number of the first and second electrodes,
the output end of the RTD is connected in series with a lower limit correction resistor for correcting the input offset voltage;
the power supply compensation circuit consists of a linear compensation resistor, an integral compensation network, a current converter, a voltage converter, a linear amplifier and a current source;
the linear compensation resistor includes: the feedback resistor and the bias resistor are connected in parallel;
the integral compensation network consists of a primary LC filter circuit consisting of an inductor L1 and a capacitor C7 and a secondary filter circuit consisting of a resistor R8 and a filter capacitor C1;
the power supply voltage adjusting circuit consists of a primary unidirectional capacitor, a voltage stabilizing adjuster and a secondary unidirectional capacitor;
the primary unidirectional capacitor is formed by connecting capacitors in parallel through an RC circuit;
the voltage stabilizing regulator consists of a diode and a resistor and converts the 15V voltage provided by the power supply compensation circuit into the required 5V voltage;
the secondary unidirectional capacitor is formed by connecting two filter capacitors in parallel, and further filters the output end of the circuit to reduce the circuit impedance;
a reference voltage protection circuit comprising: the device comprises a regulating resistor, a voltage stabilizing diode and an over-current protector;
the over-current protector is formed by connecting two diodes in parallel in different directions; when the over-large forward voltage flows through the voltage stabilizing diode, the conducting diode VD3 is grounded;
the power supply gain circuit consists of a filter, a primary feedback circuit, a secondary feedback circuit and a current source loop;
the filter is formed by connecting a resistor R10 in series with a capacitor C7, and a filter energy storage circuit is formed by the resistor R10, the capacitor C7 and the capacitor C8;
the primary feedback circuit and the secondary feedback circuit are both provided with oscillators, and a feedback loop is formed between the two oscillators to realize low-frequency gain on the primary feedback circuit and the secondary feedback circuit; when the power supply voltage changes, the phase difference between the power supply voltages of the primary feedback circuit and the secondary feedback circuit is in direct proportion, and the phase of the power supply voltage is equal to the difference between the phase of the output end of the primary feedback circuit and the phase of the output end of the secondary feedback circuit.
2. The temperature sensor time domain power supply system of claim 1, wherein: the lower limit correction resistor is connected with the gain resistor in series, and the resistance value of the gain resistor is in direct proportion to the extra common-mode voltage output by the RTD.
3. The temperature sensor time domain power supply system of claim 1, wherein: the other end of the gain resistor is electrically connected with a switch tube, and the switch tube is provided with an emitter connected with the gain resistor in series, a base electrode electrically connected with the power supply compensation circuit and a collector electrode with a grounding output.
4. The temperature sensor time domain power supply system of claim 1, wherein: the current of the RTD input is converted to a voltage signal through a series load resistor R1, and the RTD output loop current is measured by the voltage of the series load resistor R1.
5. The temperature sensor time domain power supply system of claim 1, wherein: one end of the linear compensation resistor is electrically connected with the auxiliary expansion circuit, the other end of the linear compensation resistor is electrically connected with the current source, and the current source provides a 15V alternating current power supply for the power supply compensation circuit.
6. The temperature sensor time domain power supply system of claim 1, wherein: the feedback resistor provides positive feedback for the power supply compensation circuit linearization, and the bias resistor provides a bias offset current for the power supply compensation circuit.
7. The temperature sensor time domain power supply system of claim 1, wherein: the linear compensation resistor serves as an initial compensation terminal of the power supply compensation circuit and compensates for the resistance of the lead wire encountered by the RTD in a remote location.
8. The temperature sensor time domain power supply system of claim 1, wherein: the primary unidirectional capacitor and the secondary unidirectional capacitor are symmetrically arranged at two ends of the voltage stabilizing regulator to realize low quiescent current output.
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| CN115200732A (en) * | 2022-05-31 | 2022-10-18 | 山西汾西电子科技股份有限公司 | Compensation type RTD measuring circuit of vehicle charging module |
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