CN204105948U - A kind of measurement of bldy temperature circuit - Google Patents
A kind of measurement of bldy temperature circuit Download PDFInfo
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- CN204105948U CN204105948U CN201420344525.2U CN201420344525U CN204105948U CN 204105948 U CN204105948 U CN 204105948U CN 201420344525 U CN201420344525 U CN 201420344525U CN 204105948 U CN204105948 U CN 204105948U
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Abstract
This utility model provides a kind of measurement of bldy temperature circuit, comprise the probe for detecting temperature (101), electrostatic discharge protection circuit (102), pumping signal circuit (103), signal conditioning circuit (105), the analog-digital converter (106) that are connected successively, described pumping signal circuit (103) is for injecting the pumping signal of DC constant voltage to described probe for detecting temperature (101); Described probe for detecting temperature (101) comprises critesistor (R), described pumping signal circuit (103) comprises the second resistance (R2), described critesistor (R) two ends connect first line (A) and the second circuit (B) respectively, described first line (A) is connected with DC voltage circuit, and described second resistance (R2) one end is connected with described second circuit (B).The beneficial effects of the utility model are that measurement of bldy temperature circuit structure of the present utility model is simple, cost is low, reliability is high.
Description
Technical field
This utility model relates to electronic technology field, particularly relates to a kind of measurement of bldy temperature circuit.
Background technology
Body temperature is an important parameter of reaction human body physical sign health status.A large amount of clinical thermometer adopts heavy metal mercury manufacture on the market at home, easily causes Heavy-metal Polluted Environment, forbidden the sale of mercury clinical thermometer at Systems in Certain Developed Countries after the breakage of hydrargyrum bubble.Therefore study a employing critesistor and carry out measurement of bldy temperature, and can the circuit of Measurement accuracy body temperature have great importance.
The change of critesistor Yin Wendu and the change of resistance value occurs, and temperature and resistance value have relation one to one, can extrapolate temperature value by measuring resistance, this is that we can by the foundation of thermosensitive resistance measurement body temperature.
For detecting the resistance of critesistor, we need to inject pumping signal to critesistor, general mode adopts constant current as driving source, such as, data conversion chip ADS1147, ADS1247 of TI company specially for thermosensitive resistance measurement temperature provides solution, this integrated chip constant current excitation circuit.
Current measurement of bldy temperature circuit structure is complicated, cost is high, poor reliability.
Utility model content
In order to solve the problems of the prior art, this utility model provides a kind of measurement of bldy temperature circuit.
This utility model provides a kind of measurement of bldy temperature circuit, comprise the probe for detecting temperature, electrostatic discharge protection circuit, pumping signal circuit, signal conditioning circuit, the analog-digital converter that are connected successively, described pumping signal circuit is used for the pumping signal injecting DC constant voltage to described probe for detecting temperature; Described probe for detecting temperature comprises critesistor, described pumping signal circuit comprises the second resistance, described critesistor two ends connect first line and the second circuit respectively, and described first line is connected with DC voltage circuit, and described second resistance one end is connected with described second circuit.
As further improvement of the utility model, described pumping signal circuit also comprises the first resistance, the 3rd resistance, described first resistance one end is connected with described first line, the described first resistance other end is connected with described DC voltage circuit, the described second resistance other end and described 3rd resistant series; This measurement of bldy temperature circuit also comprises tertiary circuit, and described tertiary circuit one end is connected between described second resistance and described 3rd resistance, and the described tertiary circuit other end is connected with described signal conditioning circuit.
As further improvement of the utility model, described signal conditioning circuit comprises filter circuit, described filter circuit comprises three wave filter, three described filter input ends are connected with described first line, described second circuit and described tertiary circuit respectively, and three described filter outputs are connected with described analog-digital converter.
As further improvement of the utility model, described signal conditioning circuit also comprises amplifying circuit, described amplifying circuit comprises three amplifiers, three described amplifier ins are connected with described first line, described second circuit and described tertiary circuit respectively, and three described amplifier outs are connected with three described filter input ends respectively.
As further improvement of the utility model, this measurement of bldy temperature circuit also comprises gating circuit, described signal conditioning circuit comprises filter circuit, described filter circuit comprises two wave filter, described first line is connected with described gating circuit input with described tertiary circuit, described gating circuit outfan is connected with one of them filter input end, and described second circuit is connected with wherein another filter input end, and two filter outputs are connected with described analog-digital converter.
As further improvement of the utility model, this measurement of bldy temperature circuit also comprises gating circuit, described signal conditioning circuit comprises filter circuit, described filter circuit comprises a wave filter, described first line, described second circuit, described tertiary circuit are connected with described gating circuit input respectively, described gating circuit outfan is connected with described filter input end, and described filter output is connected with described analog-digital converter.
As further improvement of the utility model, described signal conditioning circuit also comprises amplifying circuit, described amplifying circuit comprises an amplifier, described first line, described second circuit, described tertiary circuit are connected with described gating circuit input respectively, described gating circuit outfan is connected with described amplifier in, described amplifier out is connected with described filter input end, and described filter output is connected with described analog-digital converter.
As further improvement of the utility model, described amplifier is in-phase proportion amplifier.
As further improvement of the utility model, described wave filter is RC wave filter.
As further improvement of the utility model, this measurement of bldy temperature circuit also comprises digital signal processing module, described digital signal processing module is connected with described analog-digital converter, the digital signal that described digital signal processing module exports for receiving described analog-digital converter, and process is carried out to digital signal obtain temperature value.
The beneficial effects of the utility model are: measurement of bldy temperature circuit structure of the present utility model is simple, cost is low, reliability is high.
Accompanying drawing explanation
Fig. 1 is measurement of bldy temperature schematic block circuit diagram of the present utility model;
Fig. 2 is the front-end circuit figure of measurement of bldy temperature circuit of the present utility model;
Fig. 3 is the circuit diagram of the 3rd embodiment of measurement of bldy temperature circuit of the present utility model;
Fig. 4 is the circuit diagram of the 4th embodiment of measurement of bldy temperature circuit of the present utility model;
Fig. 5 is the circuit diagram of the 5th embodiment of measurement of bldy temperature circuit of the present utility model;
Fig. 6 is the circuit diagram of the 6th embodiment of measurement of bldy temperature circuit of the present utility model;
Fig. 7 is the circuit diagram of the 7th embodiment of measurement of bldy temperature circuit of the present utility model.
Detailed description of the invention
As shown in Figure 1, the utility model discloses a kind of measurement of bldy temperature circuit, comprising:
Probe for detecting temperature 101: probe for detecting temperature 101 is positioned at complete machine outside, is positioned over the specific temperature check position of human body as application end, and probe for detecting temperature type is comparatively common YSI-2.252k and YSI-10k these two kinds.
Electrostatic discharge protection circuit 102: consider that probe for detecting temperature 101 is connected to complete machine outside, needs to increase electrostatic discharge protection circuit at probe for detecting temperature 101 seam, to suppress electrostatic on the impact of circuit, plays the effect of protection circuit.
Pumping signal circuit 103: adopt DC constant voltage as pumping signal.
Gating circuit 104: the selectivity conducting adopting analog switch realizing circuit, timesharing detects needing the voltage test points measured, and the benefit of this circuit is the reusability that improve circuit, decreases the use of device; Not high to board area requirements at some, and when port number abundance, this gating circuit 104 can omit.
Signal conditioning circuit 105: this main circuit will realize amplification to signal, Filtering Processing, according to different application environment, this circuit slightly difference, such as, if there is gating circuit 104, signal conditioning circuit 105 only needs a road; Have high-resolution analog-digital converter 106 to some to apply, then signal conditioning circuit 105 is not containing signal amplification circuit etc.The scheme that concrete application provides with embodiment is as the criterion.
Analog-digital converter 106: to analog signal sampling, converts digital signal to, is the prerequisite that digital signal processing module 107 carries out digital processing.
Digital signal processing module 107: digital signal analog digital conversion obtained processes, process comprises calculating critesistor resistance value, calculates final temperature value.
This measurement of bldy temperature circuit also comprises cable 108.
As shown in Figure 2; probe for detecting temperature 101 is equivalent to one and varies with temperature and the critesistor R of change in resistance; electrostatic discharge protection circuit 102 is the LC network of two groups of equities; make use of inductance L electric current can not to suddenly change and electric capacity C voltage carry out of schematic diagram to electrostatic instantaneous pressure that can not suddenly change suppresses, thus play the effect of protection circuit.Pumping signal circuit 103 is critesistor R injection pumping signal, it is the foundation that body temperature can be measured, this pumping signal circuit 103 only needs 3 resistance and a DC voltage circuit, DC voltage circuit is used for providing galvanic current pressure (in figure VCC), and 3 resistance are respectively the first resistance R1, the second resistance R2, the 3rd resistance R3; According to concrete application, the first resistance R1, the 3rd resistance R3 can remove one and even can remove simultaneously.
If by the method for single-point acquiring, gather A, B, C point relative voltage value, count V respectively
a, V
b, V
c; If by the method that difference gathers, gather the voltage between A and B, B and C, be designated as (V respectively
a-V
b), (V
b-V
c).Calculate the electric current I of whole pumping signal circuit 103,
calculate critesistor R,
therefore only need to know resistance R
2resistance just can calculate critesistor R.R in formula
2be exactly the second resistance R2 of the present utility model.
Therefore, as first embodiment of the present utility model, described probe for detecting temperature 101 comprises critesistor R, described pumping signal circuit 103 comprises the second resistance R2, described critesistor R two ends connect first line A and the second circuit B respectively, described first line A is connected with DC voltage circuit, and described second resistance R2 is connected with described second circuit B.
As improving further first embodiment, the basis of first embodiment forms second embodiment, in the second embodiment, described pumping signal circuit 103 also comprises the first resistance R1, the 3rd resistance R3, described first resistance R1 one end is connected with described first line A, and the described first resistance R1 other end is connected with described DC voltage circuit; Described second resistance R2 one end is connected with described second circuit B, and the described second resistance R2 other end is connected with described 3rd resistance R3.
Described pumping signal circuit 103 also comprises the tertiary circuit C be connected between described second resistance R2 and described 3rd resistance R3; Described signal conditioning circuit 105 input is connected with described pumping signal circuit 103, and described signal conditioning circuit 105 outfan is connected with described analog-digital converter 106.
As shown in Figure 3, as the 3rd embodiment of the present utility model, described signal conditioning circuit 105 comprises filter circuit 1051, described filter circuit 1051 comprises three wave filter, three described filter input ends are connected with described first line A, described second circuit B and described tertiary circuit C respectively, and three described filter outputs are connected with described analog-digital converter 106.In the 3rd embodiment, higher to the requirement of analog-digital converter 106 figure place, input impedance, generally need the analog-digital converter using more than 16bit, hundreds of K Ω input impedance, the delta-sigma type ADS1148 of the 16bit of such as TI company.The measurement of bldy temperature circuit of the 3rd embodiment is generally applied in the analog-digital converter of high accuracy, high input impedance, the situation of port number abundance.
As shown in Figure 4, as the 4th embodiment of the present utility model, described signal conditioning circuit 105 also comprises amplifying circuit 1052, described amplifying circuit 1052 comprises three amplifiers, three described amplifier ins are connected with described first line A, described second circuit B and described tertiary circuit C respectively, and three described amplifier outs are connected with three described filter input ends respectively.
As shown in Figure 5, as the 5th embodiment of the present utility model, this measurement of bldy temperature circuit also comprises gating circuit 104, described signal conditioning circuit 105 comprises filter circuit 1051, described filter circuit 1051 comprises two wave filter, described first line A is connected with described gating circuit 104 input with described tertiary circuit C, described gating circuit 104 outfan is connected with one of them filter input end, described second circuit B is connected with wherein another filter input end, and two filter outputs are connected with described analog-digital converter 106.Gating circuit 104 selects 1 analog switch to carry out timesharing gating to A, C signal by 2, B fixes, such generation one group of differential signal, this group differential signal carries out anti-aliasing filter through filter circuit 1051 pairs of signals, then just directly analog-digital converter 106 is entered, the requirement of this design to analog-digital converter 106 figure place, input impedance is higher, generally need the analog-digital converter using more than 16bit, hundreds of K Ω input impedance, and be input as the form of differential pair, the delta-sigma type ADS131 of the delta-sigma type ADS1146 of the 16bit of such as TI company, 24bit.The measurement of bldy temperature circuit of the 5th embodiment is generally applied in the analog-digital converter of high accuracy, high input impedance, and is the situation with differential path input.
As shown in Figure 6, as the 6th embodiment of the present utility model, this measurement of bldy temperature circuit also comprises gating circuit 104, described signal conditioning circuit 105 comprises filter circuit 1051, described filter circuit 1051 comprises a wave filter, described first line A, described second circuit B, described tertiary circuit C are connected with described gating circuit 104 input respectively, and described gating circuit 104 outfan is connected with described filter input end, and described filter output is connected with described analog-digital converter 106.In the 6th embodiment, by a wave filter, anti-aliasing filter is carried out to signal, then just directly analog-digital converter 106 is entered, the requirement of this design analog-digital converter 106 figure place, input impedance is higher, generally need the analog-digital converter using more than 16bit, hundreds of K Ω input impedance, the delta-sigma type ADS1146 of the 16bit of such as TI company.The measurement of bldy temperature circuit of the 6th embodiment is generally applied in the analog-digital converter of high accuracy, high input impedance, and the situation that port number is limited.
As shown in Figure 7, as the 7th embodiment of the present utility model, described signal conditioning circuit 105 also comprises amplifying circuit 1052, described amplifying circuit 1052 comprises an amplifier, described first line A, described second circuit B, described tertiary circuit C are connected with described gating circuit 104 input respectively, described gating circuit 104 outfan is connected with described amplifier in, described amplifier out is connected with described filter input end, and described filter output is connected with described analog-digital converter 106.Gating circuit 104 has carried out gate action by analog switch to signal, the voltage timesharing entering signal modulate circuit 105 of A, B, C point.In figure, signal conditioning circuit 105 is made up of an amplifier and a wave filter, and wherein amplifier carries out suitable multiple amplification to signal, to meet the requirement of analog-digital converter 106 resolution; Wave filter then carries out anti-aliasing filter to signal, and provides low output impedance.This design is intended to the requirement reducing analog-digital converter 106 number of bits, input impedance, and the general analog-digital converter using 12bit, the such as AD7927 of the ADC78H89 of TI company, ADI company, if use the analog-digital converter of more seniority top digit better.The measurement of bldy temperature circuit of the 7th embodiment is generally applied in board limited area, the situation that analog-digital converter 106 number of channels is limited.
In this utility model, amplifier is in-phase proportion amplifier, and described wave filter is RC wave filter.
Described by this utility model is that a kind of constant voltage that adopts is as the measurement of bldy temperature circuit of pumping signal, this pumping signal circuit 103 a small amount of devices of needs (general only needs 3 resistance) can complete function, and the gating circuit 104 in ligand temperature measurement circuit, signal conditioning circuit 105, analog-digital converter 106 realize the high-performance measured.Because simplifying pumping signal circuit 103, both reducing cost, also improving the reliability of circuit.
Above content is in conjunction with concrete preferred implementation further detailed description of the utility model, can not assert that concrete enforcement of the present utility model is confined to these explanations.For this utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, some simple deduction or replace can also be made, all should be considered as belonging to protection domain of the present utility model.
Claims (10)
1. a measurement of bldy temperature circuit, it is characterized in that: comprise the probe for detecting temperature (101), electrostatic discharge protection circuit (102), pumping signal circuit (103), signal conditioning circuit (105), the analog-digital converter (106) that are connected successively, described pumping signal circuit (103) is for injecting the pumping signal of DC constant voltage to described probe for detecting temperature (101); Described probe for detecting temperature (101) comprises critesistor (R), described pumping signal circuit (103) comprises the second resistance (R2), described critesistor (R) two ends connect first line (A) and the second circuit (B) respectively, described first line (A) is connected with DC voltage circuit, and described second resistance (R2) one end is connected with described second circuit (B).
2. measurement of bldy temperature circuit according to claim 1, it is characterized in that: described pumping signal circuit (103) also comprises the first resistance (R1), the 3rd resistance (R3), described first resistance (R1) one end is connected with described first line (A), described first resistance (R1) other end is connected with described DC voltage circuit, and described second resistance (R2) other end is connected with described 3rd resistance (R3); This measurement of bldy temperature circuit also comprises tertiary circuit (C), described tertiary circuit (C) one end is connected between described second resistance (R2) and described 3rd resistance (R3), and described tertiary circuit (C) other end is connected with described signal conditioning circuit (105).
3. measurement of bldy temperature circuit according to claim 2, it is characterized in that: described signal conditioning circuit (105) comprises filter circuit (1051), described filter circuit (1051) comprises three wave filter, three described filter input ends are connected with described first line (A), described second circuit (B) and described tertiary circuit (C) respectively, and three described filter outputs are connected with described analog-digital converter (106).
4. measurement of bldy temperature circuit according to claim 3, it is characterized in that: described signal conditioning circuit (105) also comprises amplifying circuit (1052), described amplifying circuit (1052) comprises three amplifiers, three described amplifier ins are connected with described first line (A), described second circuit (B) and described tertiary circuit (C) respectively, and three described amplifier outs are connected with three described filter input ends respectively.
5. measurement of bldy temperature circuit according to claim 2, it is characterized in that: this measurement of bldy temperature circuit also comprises gating circuit (104), described signal conditioning circuit (105) comprises filter circuit (1051), described filter circuit (1051) comprises two wave filter, described first line (A) is connected with described gating circuit (104) input with described tertiary circuit (C), described gating circuit (104) outfan is connected with one of them filter input end, described second circuit (B) is connected with wherein another filter input end, two filter outputs are connected with described analog-digital converter (106).
6. measurement of bldy temperature circuit according to claim 2, it is characterized in that: this measurement of bldy temperature circuit also comprises gating circuit (104), described signal conditioning circuit (105) comprises filter circuit (1051), described filter circuit (1051) comprises a wave filter, described first line (A), described second circuit (B), described tertiary circuit (C) is connected with described gating circuit (104) input respectively, described gating circuit (104) outfan is connected with described filter input end, described filter output is connected with described analog-digital converter (106).
7. measurement of bldy temperature circuit according to claim 6, it is characterized in that: described signal conditioning circuit (105) also comprises amplifying circuit (1052), described amplifying circuit (1052) comprises an amplifier, described first line (A), described second circuit (B), described tertiary circuit (C) is connected with described gating circuit (104) input respectively, described gating circuit (104) outfan is connected with described amplifier in, described amplifier out is connected with described filter input end, described filter output is connected with described analog-digital converter (106).
8. measurement of bldy temperature circuit according to claim 4, is characterized in that: described amplifier is in-phase proportion amplifier.
9. measurement of bldy temperature circuit according to claim 3, is characterized in that: described wave filter is RC wave filter.
10. the measurement of bldy temperature circuit according to any one of claim 1 to 9, it is characterized in that: this measurement of bldy temperature circuit also comprises digital signal processing module (107), described digital signal processing module (107) is connected with described analog-digital converter (106), the digital signal that described digital signal processing module (107) exports for receiving described analog-digital converter (106), and process is carried out to digital signal obtain temperature value.
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| CN201420344525.2U CN204105948U (en) | 2014-06-25 | 2014-06-25 | A kind of measurement of bldy temperature circuit |
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| CN201420344525.2U CN204105948U (en) | 2014-06-25 | 2014-06-25 | A kind of measurement of bldy temperature circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422182A (en) * | 2017-06-14 | 2017-12-01 | 珠海中慧微电子股份有限公司 | Direct current energy meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107422182A (en) * | 2017-06-14 | 2017-12-01 | 珠海中慧微电子股份有限公司 | Direct current energy meter |
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