CN204072062U - A kind of temperature sensing device and armarium - Google Patents
A kind of temperature sensing device and armarium Download PDFInfo
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- CN204072062U CN204072062U CN201420450471.8U CN201420450471U CN204072062U CN 204072062 U CN204072062 U CN 204072062U CN 201420450471 U CN201420450471 U CN 201420450471U CN 204072062 U CN204072062 U CN 204072062U
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- 238000005259 measurement Methods 0.000 claims abstract description 45
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- 239000007924 injection Substances 0.000 claims description 43
- 239000008280 blood Substances 0.000 claims description 30
- 210000004369 blood Anatomy 0.000 claims description 30
- 230000009286 beneficial effect Effects 0.000 abstract description 2
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- 238000009826 distribution Methods 0.000 description 2
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- 230000003321 amplification Effects 0.000 description 1
- 230000036760 body temperature Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
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- 238000005265 energy consumption Methods 0.000 description 1
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Abstract
This utility model provides a kind of temperature sensing device, comprise the constant-current source circuit and temperature sensing circuit that are in series, described temperature sensing circuit comprises critesistor, reference resistance and analog switch, the first end of described critesistor connects the current channel Y2 of described analog switch, second end of described critesistor connects the current channel Y0 of described analog switch, the first end of described reference resistance connects the current channel Y2 of described analog switch, second end of described reference resistance connects the current channel Y1 of described analog switch, the current signal output end of described constant-current source circuit is connected with described analog switch.This utility model additionally provides a kind of armarium.The beneficial effects of the utility model are: utilize analog switch to make constant-current source timesharing drive critesistor and reference resistance, to reduce the requirement of measuring circuit to system power source voltage, simplify power circuit, reduce costs, ensure high certainty of measurement simultaneously.
Description
Technical field
This utility model relates to temperature sensing device, particularly relates to a kind of temperature sensing device and armarium.
Background technology
Temperature survey is significant in armarium, such as, measure body temperature, blood heat etc. for reflecting the vital sign of patient.The advantages such as certainty of measurement is high, safety non-toxic, equipment are simple and cheap that utilize thermosensitive resistance measurement temperature to have, thus critesistor is widely used in medical field temperature measurement equipment.
Critesistor is divided into semistor (Positive Temperature Coefficient Thermistor, and negative tempperature coefficient thermistor (Negative Temperature Coefficient Thermistor PTC), NTC) two kinds, when thermistor temp changes, its resistance changes.Measuring tempeature is obtained by measuring its resistance in temperature survey.Resistance measurement can not directly be carried out usually, and needs measurement to flow through the electric current of resistance and the pressure drop at resistance two ends.
Traditional thermosensitive resistance measurement circuit is that reference resistance resistance is known by critesistor and the minimum reference resistance series connection of temperature coefficient.Because the electric current flowing through critesistor and reference resistance is equal, the resistance of the two is proportional to the pressure drop at respective two ends, can calculate the resistance of critesistor thus.
Current electronic equipment mesolow, low-power consumption become trend, especially in armarium, no matter from the portability of patient safety, equipment or reduce energy consumption aspect, all need to reduce system voltage.And traditional thermosensitive resistance measurement circuit uses voltage source to drive or driven with current sources is all difficult to take into account certainty of measurement and lower supply voltage.To ask high certainty of measurement, when then needing critesistor resistance maximum, two ends pressure drop is close to the maximum input voltage of rear class tension measuring circuit (such as operational amplifier and analog-digital converter ADC etc.), and now the stagnation pressure of series circuit reduces to critesistor and reference resistance pressure drop sum.If reduce series resistance pressure drop, then critesistor maximum output voltage reduces, and affects certainty of measurement.
Summary of the invention
In order to solve the problems of the prior art, this utility model provides a kind of temperature sensing device and armarium.
This utility model provides a kind of temperature sensing device, comprise the constant-current source circuit and temperature sensing circuit that are in series, described temperature sensing circuit comprises critesistor, reference resistance and analog switch, the first end of described critesistor connects the current channel Y2 of described analog switch, second end of described critesistor connects the current channel Y0 of described analog switch, the first end of described reference resistance connects the current channel Y2 of described analog switch, second end of described reference resistance connects the current channel Y1 of described analog switch, the current signal output end of described constant-current source circuit is connected with described analog switch, one is arranged for by current channel Y0 in described analog switch, current channel Y1, the current channel commutation circuit of current channel Y2 difference turn-on current passage Y.
As further improvement of the utility model, the first end of described critesistor also connects the voltage measurement passage X2 of described analog switch, second end of described critesistor also connects the voltage measurement passage X0 of described analog switch, the first end of described reference resistance also connects the voltage measurement passage X2 of described analog switch, and the second end of described reference resistance also connects the voltage measurement passage X1 of described analog switch.
As further improvement of the utility model, arrange one in described analog switch for the voltage measurement channel switching circuit by voltage measurement passage X0, voltage measurement passage X1, voltage measurement passage X2 difference turn-on voltage Measurement channel X.。
As further improvement of the utility model, voltage measurement passage X2, the current channel Y2 of described analog switch ground connection or connect positive voltage source respectively or connect negative voltage source respectively respectively.
As further improvement of the utility model, described constant-current source circuit comprises operational amplifier, audion Q, resistance R3, resistance R4, wherein, the inverting input of described operational amplifier respectively with one end of described resistance R4, the emitter stage of described audion Q connects, the other end of described resistance R4 connects voltage source V CC, , the in-phase input end of described operational amplifier meets signal Vin, the outfan of described operational amplifier is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the base stage of described audion Q, the colelctor electrode of described audion Q is connected with described analog switch, the colelctor electrode of described audion Q is connected with the current channel Y of described analog switch, the voltage measurement passage X of described analog switch is voltage signal output end
This utility model additionally provides a kind of armarium, comprise as the temperature sensing device according to any one of above-mentioned, also comprise temperature survey low-pass filter circuit, Analog to Digital Converter and microprocessor, the voltage signal output end of described analog switch is connected with the input of described temperature survey low-pass filter circuit, the outfan of described temperature survey low-pass filter circuit is connected with the input of described Analog to Digital Converter, the outfan of described Analog to Digital Converter is connected with the input of described microprocessor, the outfan of described microprocessor is connected with the channel selecting control port of described analog switch.
As further improvement of the utility model, the voltage measurement passage X of described analog switch is connected with the input of described temperature survey low-pass filter circuit, the outfan of described temperature survey low-pass filter circuit is connected with the analogue signal input channel of described Analog to Digital Converter, the digital signal output end DOUT of described Analog to Digital Converter is connected microprocessor respectively with channel selecting port SW, and the outfan of described microprocessor is connected with channel selecting control port A, the channel selecting control port B of described analog switch respectively.
As further improvement of the utility model, described temperature sensing circuit comprises injection temperature sensing circuit and blood heat sensing circuit, described constant-current source circuit comprises injection temperature sensing constant-current source circuit and blood heat sensing constant-current source circuit, described temperature survey low-pass filter circuit comprises injection temperature survey low-pass filter circuit and low-pass filter circuit is measured in blood heat, the current signal output end of described injection temperature sensing constant-current source circuit is connected with described injection temperature sensing circuit, the voltage signal output end of described injection temperature sensing circuit is connected with the input of described injection temperature survey low-pass filter circuit, the described outfan of injection temperature survey low-pass filter circuit is connected with the analogue signal input channel CH1 of described Analog to Digital Converter, the current signal output end of described blood heat sensing constant-current source circuit is connected with described blood heat sensing circuit, the voltage signal output end of described blood heat sensing circuit is connected with the input of described injection temperature survey low-pass filter circuit, and the described outfan of injection temperature survey low-pass filter circuit is connected with the analogue signal input channel CH2 of described Analog to Digital Converter, the digital signal output end DOUT of described Analog to Digital Converter is connected described microprocessor respectively with channel selecting port SW, channel selecting control port A, the channel selecting control port B of described injection temperature sensing circuit are connected to described microprocessor, and channel selecting control port A, the channel selecting control port B of described blood heat sensing constant-current source circuit are connected to described microprocessor.
As further improvement of the utility model, described temperature sensing device also comprises the first resistance, the second resistance, first electric capacity and the second electric capacity, one end of described first resistance is connected with the outfan of described injection temperature survey low-pass filter circuit, the other end of described first resistance is connected with the analogue signal input channel CH1 of described Analog to Digital Converter, one end of the first electric capacity respectively, the other end ground connection of described first electric capacity; One end of described second resistance is connected with the outfan of described injection temperature survey low-pass filter circuit, the other end of described second resistance is connected with the analogue signal input channel CH2 of described Analog to Digital Converter, one end of the second electric capacity respectively, the other end ground connection of described second electric capacity.
As further improvement of the utility model, described injection temperature survey low-pass filter circuit and described blood heat are measured low-pass filter circuit and are second order active low-pass filter circuit.
The beneficial effects of the utility model are: utilize analog switch to make constant-current source timesharing drive critesistor and reference resistance, to reduce the requirement of measuring circuit to system power source voltage, simplify power circuit, reduce costs, ensure high certainty of measurement simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of a kind of temperature sensing device of this utility model;
Fig. 2 is the cardiac output measuring circuit figure of a kind of temperature sensing device of this utility model.
Detailed description of the invention
To illustrate below in conjunction with accompanying drawing and detailed description of the invention further illustrates this utility model.
As shown in Figure 1, a kind of temperature sensing device, comprises the constant-current source circuit 11 and temperature sensing circuit 12 that are in series, and wherein, temperature sensing circuit 12, comprises critesistor 121, reference resistance 122 and analog switch 123.One end of critesistor 121 meets voltage measurement passage X2, the current channel Y2 of analog switch 123 respectively, and the other end of critesistor 121 meets voltage measurement passage X0, the current channel Y0 of analog switch 123 respectively; One end of reference resistance 122 meets voltage measurement passage X2, the current channel Y2 of analog switch 123 respectively, and the other end of reference resistance 122 meets voltage measurement passage X1, the current channel Y1 of analog switch 123 respectively.Voltage measurement passage X2, the current channel Y2 of analog switch 123 connect the public port G of critesistor 121 and reference resistance 122, and temperature sensing circuit 12 is connected in drive current path that constant-current source circuit 11 provides with the current channel Y of analog switch 123 and port G.
In Fig. 1; the electric current that constant-current source circuit 11 provides is flowed into by the current channel Y of analog switch 123; flow out from the public port G of critesistor 121 and reference resistance 122, but the sense of current of this utility model institute protection circuit is not limited to be flowed out by the common port G of critesistor 121 and reference resistance 122.
The temperature coefficient of reference resistance 122, far below conventional resistive element, generally not can be thought and vary with temperature.
The model of analog switch 123 shown in Fig. 1 can be preferably MAX4582, for two-way multichannel analog switch, port A, B are channel selecting control port, and menu, as table 1, uses passage 0,1 and 2 in the temperature sensing circuit 12 of a kind of temperature sensing device that this utility model provides.In a kind of temperature sensing device that this utility model provides, the model of analog switch 123 is not limited to MAX4582.
Table 1 analog switch MAX4582 menu
For A, B control port of MAX4582, generally thinking high level higher than 1.5V, is low level lower than 1.5V; But for the sake of assurance, ensure to be identified as high level by chip higher than 2.4V, ensure to be identified as low level by chip lower than 0.8; Between 1.5 to 2.4, the discreteness by chip between 0.8 to 1.5 affects, and that is segment chip thinks that 1.6 is high, segment chip thinks that 1.6 is low, be not insure very much, but most chip threshold value is all at about 1.5V, characteristic distributions is almost normal distribution.Usual single-chip microcomputer datasheet can state, its I/O exports high level higher than 2.4V (CMOS type), and this chip of Single-chip Controlling of general more than 3.3V power voltage supply is no problem.
As shown in Figure 1, constant-current source circuit 11 is Voltage-controlled Current Source, comprises operational amplifier 111, audion Q112, resistance R3 113 and resistance R4 114.Operational amplifier 111 in-phase input end meets signal Vin, the anti-phase input terminating resistor R4 114 of operational amplifier 111 and the emitter stage of audion Q112, the outfan connecting resistance R3 113 of operational amplifier 111; Resistance R4 114 two ends connect the inverting input of voltage source V CC and operational amplifier 111 respectively; The base stage contact resistance R3 113 of audion Q112, the inverting input (i.e. the common node of the inverting input of resistance R4 114 and operational amplifier 111) of the emitter stage concatenation operation amplifier 111 of audion Q112, the current collection very constant-current source current output terminal mouth of audion Q112; Resistance R3 113 two ends are the outfan of concatenation operation amplifier 111 and the base stage of audion Q112 respectively.For the collector emitter voltage reduced due to audion Q112 changes the output current change caused, audion Q112 preferably adopts the Darlington transistor that current amplification factor is high.In Fig. 1, operational amplifier 111 preferably uses TL072C, but this utility model use the model of operational amplifier 111 to be not limited to TL072C; The type of audion Q112 is not limited to positive-negative-positive, if changing audion Q112 is NPN type, and correspondingly simply changes constant-current source structure or the sense of current, equally in this utility model protection domain.
The electric current that constant-current source circuit 11 exports is by analog switch 123, and critesistor 121 and reference resistance 122 are flow through in timesharing, and detailed process is as follows:
Analog switch 123 is switched to passage 2, when namely X connects X2, Y connection Y2, can obtain the current potential VG of critesistor 121 and reference resistance 122 public port G.This process is called calibration, and object is to eliminate circuit parameter drift to measuring the impact produced.Public port G can need to connect the structure that ground, positive voltage source, negative voltage source, resistance etc. can provide complete current path according to circuit, all belongs to this utility model unit protection scope.
Analog switch 123 is switched to passage 1, and when namely X connects X1, Y connection Y1, constant-current source flows through reference resistance 122.The voltage that note reference resistance 122 connects X1 one end is V2d, and voltage V2d exports through the voltage measurement passage X of analog switch 123.
Analog switch 123 is switched to passage 0, and when namely X connects X0, Y connection Y0, constant-current source flows through critesistor 121.The voltage that note critesistor 121 connects X0 one end is V1d, and voltage V1d exports through the voltage measurement passage X of analog switch 123.
If make analog switch 123 at passage 0, switch fast between passage 1 and passage 2, because interval is short, circuit parameter drift can not change rapidly, therefore think that the current potential VG of critesistor 121 and reference resistance 122 common port does not change, reference resistance 122 two ends pressure drop V2=|V2d-VG| can be obtained thus, critesistor 121 two ends pressure drop V1=|V1d-VG|.Note critesistor 121 and reference resistance 122 resistance are respectively R121 and R122, because critesistor 121 and reference resistance 122 use identical constant-current source, namely
can obtain
The voltage signal that temperature sensing circuit 12 exports can be measured by the tension measuring circuit of rear class (such as wave filter, analog-digital converter (ADC) and microprocessor etc.).The non-emphasis of the present utility model of wave filter, analog-digital converter and microprocessor, therefore be not described further at this.
The maximum of note critesistor 121 two ends pressure drop V1 is V1max, in the structure of traditional critesistor and reference resistance series connection, when driving current value is identical with this circuit (the respective output voltage of critesistor and reference resistance and this circuit structure in identical respectively), critesistor and reference resistance cascaded structure stagnation pressure reduce to V1max+V2, and critesistor 121 and reference resistance 122 stagnation pressure reduce to Max{V1max in this circuit, V2}, the maximum namely in V1max and V2.Under normal circumstances for improving certainty of measurement, V1max and V2 is all close to the maximum input voltage that rear class tension measuring circuit allows, and namely V1max and V2 is close; And audion Q112 and resistance 114 pressure drop are general lower in constant-current source circuit.Ignore the pressure drop of audion Q112 and resistance 114, this circuit structure critesistor and reference resistance stagnation pressure reduce to about 50% of conventional serial structure.If this circuit uses 5V power supply, in conventional serial structure, then need about 10V could obtain identical certainty of measurement.
The structure that the structure that critesistor and reference resistance are flow through in current source timesharing is connected relative to traditional critesistor and reference resistance, significantly can reduce electric current and flow through overall presure drop on path, reduce measuring circuit to the requirement of power supply, and by choose reasonable critesistor and reference resistance parameter, the two maximum output voltage can be made all close to the maximum input level of rear class filter circuit and analog-digital converter, improve signal to noise ratio and accuracy of measurement.
This utility model additionally provides a kind of armarium, comprise above-mentioned temperature sensing device, this armarium comprises the cardiac output measuring circuit of temperature sensing device, as shown in Figure 2 (the cardiac output measuring circuit figure of a kind of temperature sensing device that Fig. 2 provides), for an embodiment of the present utility model, for measuring cardiac output, comprise injection temperature sensing circuit 200, injection temperature sensing constant-current source circuit 210, injection temperature survey low-pass filter circuit 220, blood heat sensing circuit 230, blood heat sensing constant-current source circuit 240, low-pass filter circuit 250 is measured in blood heat, first resistance 261, first electric capacity 262, second resistance 263, second electric capacity 264, Analog to Digital Converter 260 and microprocessor 270.
As shown in Figure 2, the electric current that injection temperature sensing constant-current source circuit 210 exports inputs to injection temperature sensing circuit 200, the voltage that injection temperature sensing circuit 200 exports, after injection temperature survey low-pass filter circuit 220 and the first resistance 261, first electric capacity 262, inputs to the analogue signal input channel CH1 of Analog to Digital Converter 260; The electric current that blood heat sensing constant-current source circuit 240 exports inputs to blood heat sensing circuit 230, the voltage that blood heat sensing circuit 230 exports, after injection temperature survey low-pass filter circuit 250 and the second resistance 263, second electric capacity 264, inputs to the analogue signal input channel CH2 of Analog to Digital Converter 260; The digital signal output end DOUT of Analog to Digital Converter 260 is connected microprocessor 270 respectively with channel selecting port SW, channel selecting control port A, the channel selecting control port B of injection temperature sensing circuit 200 are connected to microprocessor 270, and channel selecting control port A, the channel selecting control port B of blood heat sensing constant-current source circuit 240 are connected to microprocessor 270.
As shown in Figure 2, injection temperature sensing circuit 200 is identical with blood heat sensing circuit 230 structure, comprises negative tempperature coefficient thermistor (NTC) 201, reference resistance 202, analog switch 203 and negative tempperature coefficient thermistor (NTC) 231, reference resistance 232, analog switch 233 respectively.Because injection is different with blood heat scope, negative tempperature coefficient thermistor (NTC) 201 is all not identical with resolution with negative tempperature coefficient thermistor (NTC) 231 resistance.Reference resistance 202 and reference resistance 232 correspond respectively to negative tempperature coefficient thermistor (NTC) and negative tempperature coefficient thermistor (NTC) 231.
As shown in Figure 2, injection temperature sensing constant-current source circuit 210 is identical with blood heat sensing constant-current source circuit 240 structure, comprises resistance 211, audion 212, resistance 213, operational amplifier 214 and resistance 241, audion 242, resistance 243, operational amplifier 244 respectively.The colelctor electrode of audion 212 and audion 242, as current output terminal, is made up of MMBT3906 cascade.Injection temperature sensing constant-current source circuit 210 and blood heat sensing constant-current source circuit 240 is respectively injection temperature sensing circuit 200 and blood heat sensing circuit 230 provides drive current, current value is respectively 12uA and 50uA.
As shown in Figure 2, it is identical that low-pass filter circuit 250 structure is measured in injection temperature survey low-pass filter circuit 220 and blood heat, be second order active low-pass filter circuit, bandwidth 10Hz, comprises resistance 221, electric capacity 222, resistance 223, electric capacity 224, operational amplifier 225 and resistance 251, electric capacity 252, resistance 253, electric capacity 254, operational amplifier 255 respectively.
As shown in Figure 2, the first resistance 261 concatenation operation amplifier 225 outfan and Analog to Digital Converter 260 analog input channel CH1, the first electric capacity 262 connects Analog to Digital Converter 260 analog input channel CH1 and ground; Second resistance 263 concatenation operation amplifier 255 outfan and Analog to Digital Converter 260 analog input channel CH2, the second electric capacity 264 connects Analog to Digital Converter 260 analog input channel CH2 and ground.First resistance 261, first electric capacity 262 and the second resistance 263, second electric capacity 264 are respectively used to the ability improving operational amplifier 225 and operational amplifier 255 outfan driving Analog to Digital Converter 260.
In embodiment illustrated in fig. 2, analog switch 203,233 model is MAX4582, operational amplifier 214,244,225,255 model is TL072C, and Analog to Digital Converter 260 model is ADS1254, and this utility model temperature sensing device and cardiac output measuring circuit are not limited to above chip model.
A kind of armarium that this utility model provides comprises custodial care facility, tire prison equipment, electronic clinical thermometer etc.
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 temperature sensing device, it is characterized in that: comprise the constant-current source circuit and temperature sensing circuit that are in series, described temperature sensing circuit comprises critesistor, reference resistance and analog switch, the first end of described critesistor connects the current channel Y2 of described analog switch, second end of described critesistor connects the current channel Y0 of described analog switch, the first end of described reference resistance connects the current channel Y2 of described analog switch, second end of described reference resistance connects the current channel Y1 of described analog switch, the current signal output end of described constant-current source circuit is connected with described analog switch, one is arranged for by current channel Y0 in described analog switch, current channel Y1, the current channel commutation circuit of current channel Y2 difference turn-on current passage Y.
2. temperature sensing device according to claim 1, it is characterized in that: the first end of described critesistor also connects the voltage measurement passage X2 of described analog switch, second end of described critesistor also connects the voltage measurement passage X0 of described analog switch, the first end of described reference resistance also connects the voltage measurement passage X2 of described analog switch, and the second end of described reference resistance also connects the voltage measurement passage X1 of described analog switch.
3. temperature sensing device according to claim 2, is characterized in that: arrange one in described analog switch for the voltage measurement channel switching circuit by voltage measurement passage X0, voltage measurement passage X1, voltage measurement passage X2 difference turn-on voltage Measurement channel X.
4. temperature sensing device according to claim 2, is characterized in that: voltage measurement passage X2, the current channel Y2 of described analog switch ground connection or connect positive voltage source respectively or connect negative voltage source respectively respectively.
5. temperature sensing device according to claim 2, it is characterized in that: described constant-current source circuit comprises operational amplifier, audion Q, resistance R3, resistance R4, wherein, the inverting input of described operational amplifier respectively with one end of described resistance R4, the emitter stage of described audion Q connects, the other end of described resistance R4 connects voltage source V CC, , the in-phase input end of described operational amplifier meets signal Vin, the outfan of described operational amplifier is connected with one end of described resistance R3, the other end of described resistance R3 is connected with the base stage of described audion Q, the colelctor electrode of described audion Q is connected with described analog switch, the colelctor electrode of described audion Q is connected with the current channel Y of described analog switch, the voltage measurement passage X of described analog switch is voltage signal output end.
6. an armarium, it is characterized in that: comprise the temperature sensing device according to any one of claim 1 to 5, also comprise temperature survey low-pass filter circuit, Analog to Digital Converter and microprocessor, the voltage signal output end of described analog switch is connected with the input of described temperature survey low-pass filter circuit, the outfan of described temperature survey low-pass filter circuit is connected with the input of described Analog to Digital Converter, the outfan of described Analog to Digital Converter is connected with the input of described microprocessor, the outfan of described microprocessor is connected with the channel selecting control port of described analog switch.
7. armarium according to claim 6, it is characterized in that: the voltage measurement passage X of described analog switch is connected with the input of described temperature survey low-pass filter circuit, the outfan of described temperature survey low-pass filter circuit is connected with the analogue signal input channel of described Analog to Digital Converter, the digital signal output end DOUT of described Analog to Digital Converter is connected microprocessor respectively with channel selecting port SW, and the outfan of described microprocessor is connected with channel selecting control port A, the channel selecting control port B of described analog switch respectively.
8. armarium according to claim 7, it is characterized in that: described temperature sensing circuit comprises injection temperature sensing circuit and blood heat sensing circuit, described constant-current source circuit comprises injection temperature sensing constant-current source circuit and blood heat sensing constant-current source circuit, described temperature survey low-pass filter circuit comprises injection temperature survey low-pass filter circuit and low-pass filter circuit is measured in blood heat, the current signal output end of described injection temperature sensing constant-current source circuit is connected with described injection temperature sensing circuit, the voltage signal output end of described injection temperature sensing circuit is connected with the input of described injection temperature survey low-pass filter circuit, the described outfan of injection temperature survey low-pass filter circuit is connected with the analogue signal input channel CH1 of described Analog to Digital Converter, the current signal output end of described blood heat sensing constant-current source circuit is connected with described blood heat sensing circuit, the voltage signal output end of described blood heat sensing circuit is connected with the input of described injection temperature survey low-pass filter circuit, and the described outfan of injection temperature survey low-pass filter circuit is connected with the analogue signal input channel CH2 of described Analog to Digital Converter, the digital signal output end DOUT of described Analog to Digital Converter is connected described microprocessor respectively with channel selecting port SW, channel selecting control port A, the channel selecting control port B of described injection temperature sensing circuit are connected to described microprocessor, and channel selecting control port A, the channel selecting control port B of described blood heat sensing constant-current source circuit are connected to described microprocessor.
9. armarium according to claim 8, it is characterized in that: described temperature sensing device also comprises the first resistance, the second resistance, first electric capacity and the second electric capacity, one end of described first resistance is connected with the outfan of described injection temperature survey low-pass filter circuit, the other end of described first resistance is connected with the analogue signal input channel CH1 of described Analog to Digital Converter, one end of the first electric capacity respectively, the other end ground connection of described first electric capacity; One end of described second resistance is connected with the outfan of described injection temperature survey low-pass filter circuit, the other end of described second resistance is connected with the analogue signal input channel CH2 of described Analog to Digital Converter, one end of the second electric capacity respectively, the other end ground connection of described second electric capacity.
10. armarium according to claim 8, is characterized in that: described injection temperature survey low-pass filter circuit and described blood heat are measured low-pass filter circuit and be second order active low-pass filter circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420450471.8U CN204072062U (en) | 2014-08-11 | 2014-08-11 | A kind of temperature sensing device and armarium |
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| CN201420450471.8U CN204072062U (en) | 2014-08-11 | 2014-08-11 | A kind of temperature sensing device and armarium |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104970776A (en) * | 2015-07-03 | 2015-10-14 | 深圳市掌康科技有限公司 | Body temperature detection method and high-precision dynamic calibration electronic thermometer device |
| WO2017000295A1 (en) * | 2015-07-02 | 2017-01-05 | 深圳市谷玛鹤健康科技有限公司 | Electronic clinical thermometer and control method therefor |
| CN111552275A (en) * | 2020-05-20 | 2020-08-18 | 深圳开立生物医疗科技股份有限公司 | Temperature control calibration device, temperature control equipment and method thereof |
-
2014
- 2014-08-11 CN CN201420450471.8U patent/CN204072062U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017000295A1 (en) * | 2015-07-02 | 2017-01-05 | 深圳市谷玛鹤健康科技有限公司 | Electronic clinical thermometer and control method therefor |
| CN104970776A (en) * | 2015-07-03 | 2015-10-14 | 深圳市掌康科技有限公司 | Body temperature detection method and high-precision dynamic calibration electronic thermometer device |
| CN111552275A (en) * | 2020-05-20 | 2020-08-18 | 深圳开立生物医疗科技股份有限公司 | Temperature control calibration device, temperature control equipment and method thereof |
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Granted publication date: 20150107 |