CN108931956B - Body temperature signal analog output device and method - Google Patents
Body temperature signal analog output device and method Download PDFInfo
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- CN108931956B CN108931956B CN201811020274.1A CN201811020274A CN108931956B CN 108931956 B CN108931956 B CN 108931956B CN 201811020274 A CN201811020274 A CN 201811020274A CN 108931956 B CN108931956 B CN 108931956B
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- G—PHYSICS
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0423—Input/output
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/21—Pc I-O input output
- G05B2219/21024—Analog output
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Abstract
The invention provides a body temperature signal analog output device and a method, wherein the device comprises: the device comprises a voltage source module, an adjustable resistance circuit and a detection circuit; two ends of the detection circuit are respectively connected with two terminals of an interface of the output device, and the circuit parameter value of the detection device connected with the interface is measured; one end of the voltage source module is connected with one terminal of the interface, the other end of the voltage source module is connected with one end of the adjustable resistance circuit, and the other end of the adjustable resistance circuit is connected with the other terminal of the interface; the output voltage of the voltage source module is adjustable. The voltage source module, the adjustable resistance circuit and the detection equipment form a serial passage, and the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit are changed, so that the resistance value between two terminals of an interface of the body temperature signal analog output equipment is changed, and the continuous output of the resistance value is realized.
Description
Technical Field
The invention relates to the field of medical equipment, in particular to body temperature signal analog output equipment and a body temperature signal analog output method.
Background
The physiological signal simulation is mainly used for quality control and technical training of a patient multi-parameter monitor, and the body temperature signal is one of common physiological signals, and the implementation principle is that the corresponding relation between the resistance value of a thermistor and the temperature is utilized, and the resistance value is used for replacing the designated temperature to simulate the body temperature.
The most common method for analog output of body temperature signals is to use several fixed high-precision resistors or potentiometers. The high-precision resistor can simulate specific temperature values, but continuous output of the temperature values cannot be realized, and the existing monitoring body temperature probes are various in variety, and the corresponding resistance values of the body temperature are different. The potentiometer can realize continuous output of the resistance value, and the analog body temperature has larger error due to the fact that the potentiometer is low in accuracy and has larger change along with temperature change.
Disclosure of Invention
The present invention provides a body temperature signal analog output device and method that overcomes or at least partially solves the above-referenced problems.
An embodiment of the present invention provides a body temperature signal analog output device, including: the device comprises a voltage source module, an adjustable resistance circuit and a detection circuit;
two ends of the detection circuit are respectively connected with two terminals of an interface of the output equipment, and circuit parameter values of the detection equipment connected with the interface are measured;
one end of the voltage source module is connected with one terminal of the interface, the other end of the voltage source module is connected with one end of the adjustable resistance circuit, and the other end of the adjustable resistance circuit is connected with the other terminal of the interface;
the output voltage of the voltage source module is adjustable.
The embodiment of the invention provides body temperature signal analog output equipment, which comprises a voltage source module, a detection circuit, a first selection switch and a second selection switch;
the input end of the first selection switch is connected with one terminal of an interface of the output device, and the input end of the second selection switch is connected with the other terminal of the interface;
the output end of the first selection switch is connected with one end of the voltage source module or one end of the detection circuit;
the output end of the second selection switch is connected with the other end of the voltage source module or the other end of the detection circuit;
the detection circuit measures a circuit parameter value of detection equipment connected with the interface;
the output voltage of the voltage source module is adjustable.
The embodiment of the invention provides an output method of the output equipment, which comprises the following steps:
measuring a circuit parameter value of a detection device connected to the interface; and determining the resistance value output by the output device according to the circuit parameter value of the detection device, the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit or the circuit parameter value of the detection device and the voltage value output by the voltage source module.
The embodiment of the invention provides body temperature signal analog output equipment and a body temperature signal analog output method, which have the beneficial effects that:
the embodiment of the invention provides a body temperature signal analog output device and a body temperature signal analog output method, when a detection device is externally connected with an interface of the body temperature signal analog output device, the resistance value of a voltage source module and the resistance value of an adjustable resistance circuit or the voltage value output by the voltage source module are changed, so that the resistance value between two terminals of the interface of the body temperature signal analog output device is changed, the continuous output of the resistance value is realized, different body temperature signals are simulated, and the continuous and accurate output of the simulated body temperature signals is obtained.
Drawings
Fig. 1 is a schematic structural diagram of a body temperature signal analog output device according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an embodiment of a body temperature signal analog output device provided by the present invention;
fig. 3 is a schematic structural diagram of a body temperature signal analog output device according to another embodiment of the present invention;
fig. 4 is a circuit diagram of a body temperature signal analog output device according to another embodiment of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
The body temperature signal simulation output device performs simulation of the body temperature signal by outputting a resistance value instead of the specified temperature. In the specific use process, the external detection equipment is connected with the output equipment through an interface of the output equipment, the detection equipment comprises constant current detection equipment and partial pressure detection equipment, the constant current detection equipment measures the resistance value of the output equipment through outputting constant current, and the partial pressure detection equipment measures the resistance value of the output equipment through outputting partial pressure. The analog output device of the body temperature signal generally adopts a plurality of fixed high-precision resistors or potentiometers with adjustable resistors, but the high-precision resistors cannot realize continuous output of the resistance values, and the potentiometers with adjustable resistors can realize continuous output of the resistance values, but the precision of the potentiometers is not high, and the analog body temperature signal influenced by temperature change has larger errors.
In view of the above problems, embodiments of the present invention provide a body temperature signal analog output device, which includes a voltage source module 100, an adjustable resistance circuit 200, and a detection circuit 300.
Both ends of the detection circuit 300 are connected to both terminals of the interface 400 of the output device, respectively, and the circuit parameter value of the detection device connected to the interface 400 is measured.
One end of the voltage source module 100 is connected to one terminal of the interface 400, the other end of the voltage source module 100 is connected to one end of the adjustable resistance circuit 200, and the other end of the adjustable resistance circuit 200 is connected to the other terminal of the interface 400.
The output voltage of the voltage source module 100 is adjustable.
When the interface of the body temperature signal simulation output equipment is externally connected with the detection equipment, the voltage source module, the adjustable resistance circuit and the detection equipment form a serial path, and the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit are changed, so that the resistance value between two terminals of the interface of the body temperature signal simulation output equipment is changed, the continuous output of the resistance value is realized, different body temperature signals are simulated, and the continuous and accurate output of the simulated body temperature signals is obtained.
As shown in fig. 2, which is a circuit diagram of an embodiment of a body temperature analog output device according to the present invention, as can be seen from fig. 2, the output device according to the embodiment of the present invention includes a microprocessor control unit 500. The microprocessor control unit 500 is communicatively coupled to the voltage source module 100, the adjustable resistance circuit 200, and the detection circuit 300, respectively.
The detection circuit 300 sends the measured circuit parameter values of the detection device to the microprocessor control unit 500. The microprocessor control unit 500 controls the change of the output voltage value of the voltage source module 100 and the resistance value of the adjustable resistance circuit 200. The microprocessor control unit 500 determines the resistance value output by the output device according to the circuit parameter value of the detection device, the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit.
When the detection device is connected to the outside of the interface 400 of the output device, the voltage source module 100, the adjustable resistor circuit 200 and the detection device form a serial path, and the resistance value of the equivalent resistor between the two terminals of the interface is obtained by calculating according to the circuit parameters of the serial path, wherein the resistance value of the equivalent resistor is the resistance value output by the output device.
Many electronic components in the circuit are greatly affected by temperature variation, which may cause a large error in the body temperature signal simulated by the output device, and in view of the above situation, the voltage source module 100 provided in the embodiment of the invention includes the DAC circuit 110. The ground terminal of the voltage source module 100 is connected to one terminal of the interface 400, the voltage output terminal of the DAC circuit is connected to one terminal of the adjustable resistor circuit 200, and the microprocessor control unit 500 controls the adjustment of the output voltage of the DAC circuit. The DAC circuit outputs a bipolar voltage.
The voltage source module selects DAC devices insensitive to the ambient temperature, and the voltage output by the DAC circuit can be positive pressure or negative pressure, so that the body temperature analog signal output by the body temperature signal analog output device has good stability, high precision and wide range, and the ambient temperature does not need to be monitored.
Fig. 3 is a block diagram of another embodiment of a body temperature analog output device according to the present invention, and as can be seen from fig. 3, the body temperature analog output device according to the embodiment of the present invention includes a voltage source module 100, a detection circuit 300, a first selection switch 510 and a second selection switch 520.
An input of the first selection switch 510 is connected to one terminal a of the interface 400, and an input of the second selection switch 520 is connected to the other terminal B of the interface 400. An output terminal of the first selection switch 510 is connected to one end of the voltage source module 100 or one end of the detection circuit 300, and an output terminal of the second selection switch 520 is connected to the other end of the voltage source module 100 or the other end of the detection circuit 300.
The detection circuit 300 measures a circuit parameter value of a detection device connected to the interface 400, and the output voltage of the voltage source module 100 is adjustable.
When the interface of the body temperature signal analog output device is externally connected with the detection device, the detection process and the analog output process are separately carried out through the first selection switch 510 and the second selection switch 520, the detection circuit measures the circuit parameters of the detection device in the detection process, and the analog output process changes the resistance value between two terminals of the interface of the body temperature signal analog output device by changing the voltage value output by the voltage source module (namely the voltage value at two ends of the interface), so that the continuous output of the resistance value is realized, different body temperature signals are simulated, and the continuous and accurate output of the simulated body temperature signals is obtained.
Fig. 4 is a circuit diagram of another embodiment of a body temperature analog output device according to the present invention, and fig. 4 shows that in the output device according to the embodiment of the present invention, the voltage source module includes a DAC circuit 110, a resistor 120, a variable resistor 130, a power supply 140, an N-type metal oxide semiconductor (N-MOS, N-metal oxide semiconductor) field effect transistor 150 and an amplifier 160.
The power supply 140, the variable resistor 130, the N-MOS field effect transistor 150 and the resistor 120 are sequentially connected in series, wherein the drain of the N-MOS field effect transistor 150 is connected to one end of the variable resistor 130, the source of the N-MOS field effect transistor 150 is connected to one end of the resistor 120, and the other end of the resistor 120 is connected to the ground terminal of the DAC circuit 110.
The voltage output of DAC circuit 110 is coupled to the positive input of amplifier 160, the negative input of amplifier 160 is coupled to the source of N-MOS field effect transistor 150, and the output of amplifier 160 is coupled to the gate of N-MOS field effect transistor 150.
The two ends of the variable resistor 130 are further connected to the output ends of the first selection switch 510 and the second selection switch 520 after passing through the voltage follower circuit 530, respectively.
By changing the output voltage of the DAC circuit 110 to change the current of the resistor 120, the variable resistor 130 and the resistor 120 are connected in series, and the currents are equal, so that the current of the variable resistor 130 can be obtained, and the voltage at two ends of the variable resistor 130 can be obtained according to the resistance value of the variable resistor 130, which is the output voltage of the voltage source module 100, and the output voltage is the voltage at two ends of the interface 400 after being output by the voltage follower circuit 530.
Further, a body temperature analog output device provided in an embodiment of the present invention includes a microprocessor control unit 500. The microprocessor control unit 500 is communicatively coupled to the DAC circuit 110, the variable resistor 130, and the detection circuit 300, respectively.
The detection circuit 300 sends the measured circuit parameter values of the detection device to the microprocessor control unit 500. The microprocessor control unit 500 controls the change of the output voltage value of the DAC circuit 110 and the resistance value of the variable resistor 130. The microprocessor control unit 500 determines the resistance value output by the output device according to the circuit parameter value of the detection device, the resistance value of the resistor 120, the voltage value output by the DAC circuit 110, and the resistance value of the variable resistor 130.
When the detection device is connected to the outside of the interface 400 of the output device, the detection circuit 300 firstly measures the current parameter value of the detection device, and calculates the resistance value of the equivalent resistor between the two terminals of the interface by controlling and changing the output voltage of the voltage source module 100, namely the voltage at the two ends of the interface, wherein the resistance value of the equivalent resistor is the resistance value output by the output device.
The variable resistor 130 includes a potentiometer and a variable resistance circuit connected in series or parallel. The resistance values of the potentiometer and the variable resistance circuit can be flexibly selected according to the range of the output resistance value required by the body temperature simulation module, the precision of the output resistance value of the body temperature simulation circuit is improved, the precision of the output resistance value of the equipment is ensured, and meanwhile, the continuous output of the resistance value of the equipment is realized.
In view of the situation that the accuracy of the output resistance value of the body temperature simulation module is improved only when the number of potentiometers and the variable resistance circuits is small and the connection relationship is simple, as can be seen from fig. 4, the variable resistor 130 comprises a potentiometer 131, a first variable resistance circuit 132 and a second variable resistance circuit 133, and the potentiometer 131 is connected in parallel with the first variable resistance circuit 132 and then connected in series with the second variable resistance circuit 133. Variable resistor 130 outputs the value R of the resistor CD The method comprises the following steps:
wherein R is 2 、R 3 And R is 4 The resistance values of the potentiometer 131, the first variable resistance circuit 132, and the second variable resistance circuit 133 are respectively.
Resistance R of variable resistor 130 CD The resistance values of the potentiometer 131, the first variable resistance circuit 132, and the second variable resistance circuit 133 can be flexibly selected according to the range of the required resistance values.
Further, the output device further includes a voltage detection circuit 600, two ends of an input end of the voltage detection circuit 600 are respectively connected with two ends of the variable resistor 130, an output end of the voltage detection circuit 600 is connected with the microprocessor control unit 500, and the microprocessor control unit 500 determines whether the voltage of two ends of the variable resistor 130 is equal to the calculated voltage value.
The embodiment of the invention also provides an output method of the body temperature signal simulation output device, which comprises the following steps:
measuring a circuit parameter value of a detection device connected to the interface; and determining the resistance value output by the output device according to the circuit parameter value of the detection device, the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit or the circuit parameter value of the detection device and the voltage value output by the voltage source module.
The detection devices connected with the output device comprise different types, and the types of the detection devices comprise constant current detection devices and partial pressure detection devices. In view of the above, the output method of the body temperature signal analog output device provided by the invention measures the current value output by the detection device when the resistance value or the voltage value of the circuit connected in series with the detection device is changed before measuring the circuit parameter value of the detection device, judges that the detection device is a constant current detection device when the current value is unchanged, and judges that the detection device is a partial pressure detection device when the current value is changed.
Specifically, as shown in fig. 2, both ends of the detection circuit 300 are connected to two terminals A, B of the interface 400 of the output device, respectively. When the detection equipment is connected to two terminals A, B of the interface 400 of the output equipment, changing the voltage output by the voltage source module 100, and when the current flowing through the adjustable resistance circuit 200 is unchanged, indicating that the connected detection equipment is constant current detection equipment; when the current flowing through the adjustable resistance circuit 200 changes, the connected detection device is a voltage division detection device.
When the types of the detection devices connected at the interfaces are different, the types of the circuit parameters of the detection devices to be measured are different, and when the detection devices are detected to be constant-current detection devices, the circuit parameter value of the detection device to be measured is the output current I. When the detection device is detected to be a partial pressure detection device, the measured circuit parameter values of the detection device are output voltage U and internal resistance R.
Specifically, as shown in fig. 2, the detection circuit measures the voltage between the two terminals A, B of the interface 400, and when the connected detection device is a constant current detection device:
in the detection process, it can be calculated that:
wherein R is b To detect the resistance value of the adjustable resistor circuit 200 during the process, U CA To detect the voltage value at two ends of the adjustable resistor circuit 200 in the process, U BC The microprocessor control unit controls the voltage value output by the DAC circuit in the detection process, U BA Is the voltage value at both ends of the output end of the voltage division detecting device detected by the detecting circuit 300 in the detecting process, and the detecting circuit 300 can measure the positive pressure or the negative pressure at both ends of B, A.
In the analog output process, the voltage U between A, B BA '＝U CA '+U BC '＝I×R b '+U BC ' wherein U CA ' is the voltage value at two ends of the adjustable resistor circuit 200 in the analog output process, U BC ' is the voltage value, R ' output by the DAC circuit 110 controlled by the microprocessor control unit during analog output ' b To simulate the resistance value of the adjustable resistance circuit 200 in the output process, the resistance R between the two points A, B can be obtained AB The body temperature signal which is simulated and output by the output equipment is:
when the accessed detection equipment is partial pressure detection equipment:
in the detection process, the resistance value R of the adjustable resistance circuit 200 is controlled to be changed b The voltage value between the two points B, A is measured at the moment to be infinite (open circuit), namely the output voltage U of the detection device. Controlling and changing resistance value R of adjustable resistance circuit 200 b To fix the resistance value, flow through the resistor R b Is set according to the current of (1):
then calculate the internal resistance of the detection device
In the analog output process, the resistance value R of the adjustable resistance circuit 200 is controlled to be changed b ' 0 ohm, U BA '＝U BC ', adjust U BC The 'value' can simulate different body temperature signals, namely the resistance R between the A, B points can be obtained AB The body temperature signal which is simulated and output by the output equipment is:
furthermore, in the analog output process of the output device, the detection circuit can monitor the magnitude of the body temperature analog signal which is output by the output device in real time and judge whether the body temperature analog signal is correct in real time.
Specifically, as shown in fig. 4, when the detection process and the analog output process are separately performed by the first selection switch 510 and the second selection switch 520, during the detection process, the output end of the first selection switch 510 is connected to one end of the detection circuit 300, the output end of the second selection switch 520 is connected to the other end of the detection circuit 300, and the detection circuit 300 determines the type of the detection device connected to the interface and measures the circuit parameter value of the detection device. That is, when the detection circuit 300 detects that the detection device is a constant current detection device, the measured circuit parameter value of the detection device is the output current I. When the detection circuit 300 detects that the detection device is a voltage division detection device, the measured circuit parameter values of the detection device are the output voltage U and the internal resistance R.
In the analog output process, the output end of the first selection switch 510 is connected to one end of the voltage source module 100, and the output end of the second selection switch 520 is connected to the other end of the voltage source module 100.
DAC circuit 110 controls the current of the series circuit of resistor 120 and variable resistor 130:
wherein,U DAC r is the output voltage of DAC circuit 110 1 The resistance of resistor 120.
The voltage between the junction C of the N-MOS field effect transistor 150 and the variable resistor 130 and the junction D of the power source 140 and the variable resistor 130 is:
because the C point and the D point are voltage following outputs, U CD ＝U AB 。
The microprocessor control unit 500 calculates and determines the output voltage of the output device according to the output voltage of the DAC circuit 110, the resistance of the resistor 120, and the resistance of the variable resistor 130, and the detection circuit 600 detects the voltage between the point C and the point D, so as to calibrate in real time whether the calculated output voltage is correct. Abnormal time adjustment I' and/or R CD And the output is normal.
When the detection equipment is constant current detection equipment, the resistance between the two points of A, B is obtained:
when the detection equipment is partial pressure detection equipment, the resistance between the A, B two points is obtained:
the R is AB The body temperature signal is simulated and output by the output device.
Finally, the methods of the present application are only preferred embodiments and are not intended to limit the scope of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A body temperature signal analog output device, the output device comprising: the device comprises a voltage source module, an adjustable resistance circuit and a detection circuit;
two ends of the detection circuit are respectively connected with two terminals of an interface of the output equipment, and circuit parameter values of the detection equipment connected with the interface are measured;
one end of the voltage source module is connected with one terminal of the interface, the other end of the voltage source module is connected with one end of the adjustable resistance circuit, and the other end of the adjustable resistance circuit is connected with the other terminal of the interface;
the output voltage of the voltage source module is adjustable;
the output equipment comprises a microprocessor control unit which is respectively in communication connection with the voltage source module, the adjustable resistance circuit and the detection circuit;
the detection circuit sends the measured circuit parameter value of the detection equipment to the microprocessor control unit;
the microprocessor control unit is used for controlling and changing the output voltage value of the voltage source module and the resistance value of the adjustable resistance circuit;
the microprocessor control unit determines the resistance value output by the output device according to the circuit parameter value of the detection device, the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit;
the microprocessor control unit determines the resistance value output by the output device according to the circuit parameter value of the detection device, the voltage value output by the voltage source module and the resistance value of the adjustable resistance circuit, and comprises the following components:
calculating according to circuit parameters of the serial path to obtain the resistance value of an equivalent resistor between two terminals of the interface, and taking the resistance value of the equivalent resistor as the resistance value output by output equipment; the series circuit is formed by a voltage source module, an adjustable resistance circuit and detection equipment.
2. The output device of claim 1, wherein the voltage source module comprises a DAC circuit communicatively coupled to the microprocessor control unit;
the grounding end of the voltage source module is connected with one terminal of the interface, and the voltage output end of the DAC circuit is connected with one end of the adjustable resistance circuit;
the microprocessor control unit controls and adjusts the output voltage of the DAC circuit.
3. The body temperature signal analog output device is characterized by comprising a voltage source module, a detection circuit, a first selection switch and a second selection switch;
the input end of the first selection switch is connected with one terminal of an interface of the output device, and the input end of the second selection switch is connected with the other terminal of the interface;
the output end of the first selection switch is connected with one end of the voltage source module or one end of the detection circuit;
the output end of the second selection switch is connected with the other end of the voltage source module or the other end of the detection circuit;
the detection circuit measures a circuit parameter value of detection equipment connected with the interface;
the output voltage of the voltage source module is adjustable;
the output equipment also comprises a microprocessor control unit which is respectively in communication connection with the DAC circuit, the variable resistor and the detection circuit;
the detection circuit sends the measured circuit parameter value of the detection equipment to the microprocessor control unit;
the microprocessor control unit controls and changes the output voltage value of the DAC circuit and the resistance value of the variable resistor;
the microprocessor control unit determines the resistance value output by the output device according to the circuit parameter value of the detection device, the resistance value of the resistor, the voltage value output by the DAC circuit and the resistance value of the variable resistor;
the microprocessor control unit determines the resistance value output by the output device according to the circuit parameter value of the detection device, the resistance value of the resistor, the voltage value output by the DAC circuit and the resistance value of the variable resistor, and comprises the following steps:
calculating according to circuit parameters of the serial path to obtain the resistance value of an equivalent resistor between two terminals of the interface, and taking the resistance value of the equivalent resistor as the resistance value output by output equipment; the series circuit is formed by a voltage source module, an adjustable resistance circuit and detection equipment.
4. The output device of claim 3, wherein the voltage source module comprises a DAC circuit, a resistor, a variable resistor, a power supply, an N-MOS field effect transistor, and an amplifier;
the power supply, the variable resistor, the N-MOS field effect transistor and the resistor are sequentially connected in series, the drain electrode of the N-MOS field effect transistor is connected with one end of the variable resistor, the source electrode of the N-MOS field effect transistor is connected with one end of the resistor, and the other end of the resistor is connected with the grounding end of the DAC circuit;
the voltage output end of the DAC circuit is connected with the positive input end of the amplifier;
the reverse input end of the amplifier is connected with the source electrode of the N-MOS field effect transistor, and the output end of the amplifier is connected with the grid electrode of the N-MOS field effect transistor;
and two ends of the variable resistor are respectively connected with the output ends of the first selection switch and the second selection switch after passing through the voltage follower circuit.
5. The output device according to claim 4, wherein the variable resistor includes a potentiometer, a first variable resistor circuit, and a second variable resistor circuit;
the potentiometer is connected with the first variable resistance circuit in parallel and then connected with the second variable resistance circuit in series.
6. A method of outputting an output device according to any one of claims 1 to 5, characterized in that the method comprises:
measuring a circuit parameter value of a detection device connected to the interface;
and determining the resistance value output by the output device according to the circuit parameter value of the detection device, the resistance value of the resistor, the voltage value output by the DAC circuit and the resistance value of the variable resistor.
7. The output method according to claim 6, wherein the measuring the value of the current output from the detecting device is performed while changing the magnitude of the resistance value or the voltage value of the circuit connected in series with the detecting device before the measuring the value of the circuit parameter of the detecting device connected to the interface;
judging the detection equipment to be constant current detection equipment when the current value is unchanged;
and judging that the detection equipment is partial pressure detection equipment when the current value changes.
8. The output method according to claim 7, wherein when the detecting device is a constant current detecting device, the circuit parameter value of the detecting device to which the interface is connected is measured as an output current;
when the detection equipment is a partial pressure detection equipment, the circuit parameter value of the detection equipment connected with the interface is measured to be output voltage and internal resistance.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202408872U (en) * | 2011-12-26 | 2012-09-05 | 秦皇岛市康泰医学系统有限公司 | Biomedical signal simulator |
| CN105300269A (en) * | 2015-11-16 | 2016-02-03 | 广东省自动化研究所 | Wireless precision strain measuring device and wireless precision strain measuring method |
| CN205019031U (en) * | 2015-08-14 | 2016-02-10 | 重庆工业职业技术学院 | Body temperature detecting system |
| CN105353334A (en) * | 2015-11-10 | 2016-02-24 | 中国电力科学研究院 | Output model for controlling simulation thermal resistance through servo motor and operation method thereof |
| JP2016070835A (en) * | 2014-09-30 | 2016-05-09 | パナソニックＩｐマネジメント株式会社 | Detection device and detection system |
| CN108036804A (en) * | 2018-01-08 | 2018-05-15 | 成都柔电云科科技有限公司 | A kind of device adjusted for resistance strain gage output |
| CN108181544A (en) * | 2018-01-16 | 2018-06-19 | 苏州华旃航天电器有限公司 | A kind of electric connector leakage current and insulation resistance measuring device and its measuring method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102759661A (en) * | 2011-04-28 | 2012-10-31 | 鸿富锦精密工业（深圳）有限公司 | Testing circuit and testing method for temperature compensating resistor |
-
2018
- 2018-09-03 CN CN201811020274.1A patent/CN108931956B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202408872U (en) * | 2011-12-26 | 2012-09-05 | 秦皇岛市康泰医学系统有限公司 | Biomedical signal simulator |
| JP2016070835A (en) * | 2014-09-30 | 2016-05-09 | パナソニックＩｐマネジメント株式会社 | Detection device and detection system |
| CN205019031U (en) * | 2015-08-14 | 2016-02-10 | 重庆工业职业技术学院 | Body temperature detecting system |
| CN105353334A (en) * | 2015-11-10 | 2016-02-24 | 中国电力科学研究院 | Output model for controlling simulation thermal resistance through servo motor and operation method thereof |
| CN105300269A (en) * | 2015-11-16 | 2016-02-03 | 广东省自动化研究所 | Wireless precision strain measuring device and wireless precision strain measuring method |
| CN108036804A (en) * | 2018-01-08 | 2018-05-15 | 成都柔电云科科技有限公司 | A kind of device adjusted for resistance strain gage output |
| CN108181544A (en) * | 2018-01-16 | 2018-06-19 | 苏州华旃航天电器有限公司 | A kind of electric connector leakage current and insulation resistance measuring device and its measuring method |
Non-Patent Citations (2)
| Title |
|---|
| 基于分压式原理测量热电阻阻值的方法;赵振华;周伟;;电子测量技术(08) * |
| 多种温度传感器信号调理电路设计;兀伟;王航宇;;电子设计工程(22) * |
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