CN211318711U - Invasive sphygmomanometer lead falling detection circuit - Google Patents
Invasive sphygmomanometer lead falling detection circuit Download PDFInfo
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- CN211318711U CN211318711U CN201922002306.1U CN201922002306U CN211318711U CN 211318711 U CN211318711 U CN 211318711U CN 201922002306 U CN201922002306 U CN 201922002306U CN 211318711 U CN211318711 U CN 211318711U
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Abstract
The utility model provides a noninvasive sphygmomanometer leads detection circuitry that drops, this circuit includes: a power supply circuit and a lead fall-off detection circuit electrically connected to each other; the power supply circuit is used for acquiring the state of the leads of the invasive sphygmomanometer, converting the state into a drop voltage signal and transmitting the drop voltage signal to the lead drop detection circuit; the lead falling detection circuit comprises an instrument operation amplification unit and a comparison unit which are electrically connected in sequence; the instrument operation amplification unit is used for removing common-mode interference from the falling voltage signal and then performing differential voltage amplification processing to obtain a differential amplified voltage signal; the comparison unit is used for comparing the differential amplification voltage signal with the drop reference voltage and then outputting a logic level signal. The embodiment of the utility model provides a noninvasive sphygmomanometer leads detection circuitry that drops through the improvement to lead detection circuitry that drops, has improved the detection range of wide voltage, overcomes among the prior art because the mode circuit of ac coupling is complicated, precision requirement shortcoming such as high.
Description
Technical Field
The utility model relates to an electronic circuit technical field especially relates to a noninvasive sphygmomanometer leads detection circuitry that drops.
Background
Blood pressure parameters are one of the indispensable parameters for detecting human electrophysiological signals in monitoring equipment. The monitoring of real-time changes of blood pressure in critical patients such as shock patients, some cardiac surgeries and other major surgeries is of great clinical value, and needs to be realized by invasive sphygmomanometer monitoring technology.
Because invasive sphygmomanometer belongs to isolation application part, most of power supply schemes adopt isolation power supply to directly supply power, or voltage reduction treatment is carried out through voltage stabilization chip. The conventional invasive sphygmomanometer lead falling detection is mostly realized by adopting an alternating current coupling mode, an alternating current signal is mainly directly added at an electrode input end, an amplifying circuit of the invasive sphygmomanometer adopts bipolar differential amplification, the added alternating current signal is subjected to common mode offset at an amplification tail end, and meanwhile, another bypass realizes amplification and filtering of a tiny alternating current signal so as to judge the current electrode falling state.
However, the invasive sphygmomanometer is detected in a mode of electrode falling in an alternating current coupling mode, so that an alternating current input excitation circuit is added at an input end, and the burden of filtering processing is added for the whole amplification trunk circuit; moreover, a drop detection circuit for bypass needs continuous amplification and filtering, so that the chip cost is increased, the detection precision is easily interfered by the environment, and the judgment effect is influenced; moreover, the isolation power supply supplies large ripples, the analog circuit is required to have a higher power supply rejection ratio, and the adoption of the voltage stabilizing chip increases the power consumption of the circuit.
Therefore, a simple and effective method for detecting the falling-off of the wide-voltage electrode is provided to overcome the defects of complicated circuit, high precision requirement and the like in the alternating current coupling mode in the prior art, and the method becomes a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a there is the leading detection circuitry that drops of wound sphygmomanometer for the mode circuit of the ac coupling that solves the prior art existence is complicated, and the detection circuitry precision that drops hangs down waits defect.
The embodiment of the utility model provides a noninvasive sphygmomanometer leads detection circuitry that drops, include: a power supply circuit and a lead-off detection circuit electrically connected to each other, wherein:
the power supply circuit is used for acquiring the state of the leads of the invasive sphygmomanometer, converting the state into a drop voltage signal and transmitting the drop voltage signal to the lead drop detection circuit;
the lead falling detection circuit comprises an instrument operational amplification unit and a comparison unit which are sequentially and electrically connected, wherein the instrument operational amplification unit is used for removing common-mode interference from a falling voltage signal and then carrying out differential voltage amplification processing to obtain a differential amplified voltage signal; the comparison unit is used for comparing the differential amplification voltage signal with the drop reference voltage and then outputting a logic level signal.
Furthermore, the power supply circuit comprises a voltage-stabilizing source unit, an operational amplifier and a PNP triode which are electrically connected;
the anode of the voltage-stabilizing source unit is connected with one end of a resistor R5 and is grounded; the cathode of the voltage stabilizing source unit is connected with the homodromous input pin of the operational amplifier, one end of a resistor R4 and one end of a resistor R2; the reference pole of the voltage-stabilizing source unit is connected with the other end of the resistor R4 and the other end of the resistor R5, wherein: the inverting input pin of the operational amplifier is connected with the output pin of the operational amplifier and one end of a resistor R3; the fourth pin of the operational amplifier is grounded; the seventh pin of the operational amplifier is connected with the anode of an external direct-current power supply, one end of a capacitor C1 and the other end of a resistor R2, and the other end of the capacitor C1 is grounded; the emitter of the PNP triode is connected with a wound sphygmomanometer lead, the base of the PNP triode is connected with the other end of the resistor R3, the collector of the PNP triode is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with the anode of an external direct-current power supply.
Furthermore, the instrument operational amplification unit mainly comprises a differential amplifier; the second pin and the third pin of the differential amplifier are respectively connected with the emitter and the collector of the PNP triode; the fourth pin of the differential amplifier is connected with one end of a capacitor C2 and the negative electrode of an external direct-current power supply, and the other end of the capacitor C2 is grounded; the fifth pin of the differential amplifier is grounded; and the sixth pin of the differential amplifier is connected with the comparison unit.
Further, the first pin of the differential amplifier is connected to one end of a resistor R10, and the other end of the resistor R10 is connected to the eighth pin of the differential amplifier.
Furthermore, the comparison unit mainly comprises a comparator; the first input end of the comparator is connected with the sixth pin of the differential amplifier; the second input end of the comparator is connected with one end of the resistor R7 and one end of the resistor R11, the other end of the resistor R11 is grounded, and the other end of the resistor R7 is connected with the anode of the external direct-current power supply; the output end of the comparator is used for outputting a logic level signal.
Furthermore, the lead fall-off detection circuit also comprises an optical coupling unit, wherein the optical coupling unit is used for carrying out photoelectric isolation on the logic level signal and outputting a detection current signal according to the received logic level signal.
Further, the optical coupler unit mainly comprises an optical coupler; the first input end of the optical coupler is connected with one end of a resistor R6, and the other end of the resistor R6 is grounded; the second input end of the optical coupler is connected with one end of a capacitor C4, one end of a resistor R8 and the output end of the comparator, the other end of the capacitor C4 is grounded, and the other end of the resistor R8 is connected with the anode of the external direct-current power supply; the first output end of the optical coupler and the second output end of the optical coupler are used for outputting a detection current signal, the first output end of the optical coupler is connected with one end of a resistor R9, and the other end of the resistor R9 is grounded; and the second output end of the optical coupler is connected with an optical coupler driving power supply.
Furthermore, the invasive sphygmomanometer lead drop detection circuit provided by the embodiment of the utility model also comprises an indication unit, wherein the indication unit comprises a display device and an audible and visual alarm; the indicating unit is connected with the first output end of the optical coupler.
Further, in the embodiment of the present invention, the voltage regulator unit is a precision voltage regulator TL43, and the operational amplifier is an LF351 operational amplifier; the PNP triode is an IBP RF triode, the differential amplifier is an INA128 amplifier, the comparator is an LM339 comparator, and the optical coupler is a TLP521 coupler.
Further, in the embodiment of the present invention, the resistance of the resistor R1 is 51 Ω/1W, the resistance of the resistor R2 is 1K Ω, the resistance of the resistor R3 is 1K Ω, the resistance of the resistor R4 is 20K Ω, the resistance of the resistor R5 is 9.1K Ω, the resistance of the resistor R6 is 3.6K Ω, the resistance of the resistor R7 is 5.9K Ω, the resistance of the resistor R8 is 300K Ω, the resistance of the resistor R9 is 10K Ω, the resistance of the resistor R10 is 5.9K Ω, and the resistance of the resistor R11 is 5.9K Ω; the capacitance of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are all 0.1 muF.
The embodiment of the utility model provides a pair of invasive sphygmomanometer leads detection circuitry that drops, leads the detection circuitry that drops through setting up the invasive sphygmomanometer that comprises supply circuit and the detection circuitry that drops leads, through the design to the detection circuitry that drops that leads wherein, has improved the detection range of wide voltage, overcomes among the prior art because the mode circuit of ac coupling is complicated, precision requirement height grade shortcoming.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a invasive sphygmomanometer lead fall-off detection circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a power supply circuit according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a circuit for detecting the drop of leads of an invasive sphygmomanometer according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a TL43 precision voltage regulator TL43 according to an embodiment of the present invention;
fig. 5 is a schematic voltage distribution diagram of a TL43 precision voltage regulator according to an embodiment of the present invention;
fig. 6 is an internal structural diagram of an LF351 operational amplifier according to an embodiment of the present invention;
fig. 7 is an internal structural diagram of an INA128 amplifier according to an embodiment of the present invention;
fig. 8 is an internal structural diagram of an LM339 comparator according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a invasive sphygmomanometer lead fall-off detection circuit, including but not limited to: a power supply circuit and a lead-off detection circuit electrically connected to each other, wherein:
the power supply circuit is used for acquiring the state of the leads of the invasive sphygmomanometer, converting the state into a drop voltage signal and transmitting the drop voltage signal to the lead drop detection circuit; the lead falling detection circuit comprises an instrument operation amplification unit and a comparison unit which are electrically connected in sequence; the instrument operation amplification unit is used for removing common-mode interference from the falling voltage signal and then performing differential voltage amplification processing to obtain a differential amplified voltage signal; the comparison unit is used for comparing the differential amplification voltage signal with the drop reference voltage and then outputting a logic level signal.
Among them, the invasive sphygmomanometer measuring device is used for directly measuring the pressure in a blood vessel, and the measuring principle thereof is as follows: the measuring catheter is first placed inside the blood vessel of the measured part via puncture, the outer end of the catheter is connected directly to the pressure sensor, and the fluid has pressure transferring effect to transfer the pressure inside the blood vessel to the outer pressure sensor so as to obtain dynamic waveform of the real-time pressure change inside the blood vessel. The non-invasive blood pressure measuring method is an indirect method for measuring the blood pressure of the human body, and the blood pressure measured by various non-invasive blood pressure measuring methods has a certain difference with the real blood pressure value of the human body. Since invasive blood pressure meters are generally used for continuous, reliable and accurate real-time monitoring of blood pressure of patients with shock, some cardiac surgery or other major surgery. Therefore, whether the leads of the invasive sphygmomanometer fall off or not needs to be monitored, and when the leads fall off, workers can be reminded of processing timely.
The embodiment of the utility model provides a pair of invasive sphygmomanometer leads and drops is mainly used for being connected with the pressure sensor of invasive sphygmomanometer, through the pressure variation that detects pressure sensor, converts the current change that corresponds to, then exports corresponding instruction unit, makes things convenient for staff direct reading. Specifically, when a lead of the invasive sphygmomanometer falls off or partially falls off, the change of a piezoresistor in the pressure sensor can be caused; the voltage dependent resistor is connected in series with the setting branch of the power supply circuit, so that the resistance change of the branch can be converted into a voltage change signal, namely, a drop voltage signal is generated.
Further, the power supply circuit is electrically connected with the lead falling detection circuit so as to transmit the falling voltage signal to the lead falling detection circuit. Since the normal blood pressure is generally 90-140mmHg (systolic pressure), the resistance of the pressure sensor is very limited due to the change of the blood pressure, and the generated dropping voltage signal is weak and is not easy to be directly read and processed. The embodiment of the utility model provides an in, drop detection circuitry through leading and set up at least one instrument operation amplification unit to be used for conveniently enlargiing the processing with the voltage signal that drops, so that follow-up circuit's processing.
Furthermore, the invasive sphygmomanometer lead fall-off detection circuit provided by the embodiment is provided with a comparison unit, and is used for judging whether the sphygmomanometer lead falls off or not according to the differential amplification voltage signal generated after amplification and output by the instrument operation amplification unit. Specifically, the differential amplification voltage signal and the drop-off state voltage signal can be respectively connected to two input ends of the comparison unit, and at this time, whether the voltmeter lead drops or not can be judged according to the logic level signal output by the comparison unit. Wherein the logic level signal may be a high level signal or a low level signal.
The embodiment of the utility model provides an invasive sphygmomanometer leads detection circuitry that drops, leads the detection circuitry that drops through setting up the invasive sphygmomanometer that comprises supply circuit and the detection circuitry that drops leads, through the design to the detection circuitry that drops that leads wherein, has improved the detection range of wide voltage, overcomes among the prior art because the mode circuit of alternating current coupling is complicated, precision requirement height grade shortcoming.
Based on the content of the above embodiment, as an alternative embodiment, as shown in fig. 2, the above power supply circuit includes a voltage regulator unit, an operational amplifier and a PNP triode, which are electrically connected, wherein an anode (2) of the voltage regulator unit is connected with one end of a resistor R5 and is grounded; the cathode (3) of the voltage stabilizing source unit is connected with the homodromous input pin (3) of the operational amplifier, one end of the resistor R4 and one end of the resistor R2; and a reference electrode (1) of the voltage-stabilizing source unit is connected with the other end of the resistor R4 and the other end of the resistor R5.
The inverting input pin (2) of the operational amplifier is connected with the output pin (6) of the operational amplifier and one end of a resistor R3; the fourth pin of the operational amplifier is grounded (4); the seventh pin (7) of the operational amplifier is connected with the positive electrode (such as +12VS) of the external direct current power supply, one end of a capacitor C1 and the other end of a resistor R2, and the other end of the capacitor C1 is grounded.
The emitter (2) of the PNP triode is connected with a wound sphygmomanometer lead, the base (1) of the PNP triode is connected with the other end of the resistor R3, the collector (3) of the PNP triode is connected with one end of the resistor R1, and the other end of the resistor R1 is connected with the anode of an external direct-current power supply.
The present embodiment is not specifically limited, and the ground refers to a working ground, where the working ground may be 9V, 12V, 36V, and the like.
In the embodiment of the present invention, the model selection of the regulator unit Q2, the operational amplifier U1, and the NPN type triode Q1 is not specifically limited.
Wherein, the emitter of NPN triode Q1 is connected with sensor BP-DR of the invasive sphygmomanometer. The working principle of the power supply circuit provided by the embodiment of the utility model is that as the sensor BP-DR presents resistance characteristics, the resistance changes along with the change of pressure,
when the lead of the invasive sphygmomanometer is not dropped, the emitter of the NPN triode is connected with the invasive blood pressure sensor, current flows through the NPN triode at the moment, and the base and the emitter have potential difference; once the lead of the invasive sphygmomanometer falls off, the emitter of the NPN triode is suspended, no current flows through the NPN triode, and the base and the emitter have equal potential; at this time, the change of the base electrode and the emitter electrode can be converted into corresponding drop voltage signals, and the signals are transmitted to a lead drop detection circuit.
The embodiment of the utility model provides a supply circuit has realized the production of dropout voltage signal through setting up benchmark steady voltage source, operational amplifier, NPN type triode, and no power frequency interference is introduced, and circuit structure is simple stable, receives environmental impact less.
Based on the content of the above embodiment, as shown in fig. 3, as an alternative embodiment, the meter operational amplification unit mainly includes a differential amplifier U4; a second pin (2) and a third pin (3) of the differential amplifier U4 are respectively connected with an emitter (2) and a collector (3) of the PNP triode Q1; a fourth pin (4) of the differential amplifier is connected with one end of a capacitor C2 and the negative electrode of an external direct-current power supply, and the other end of the capacitor C2 is grounded; the fifth pin (5) of the differential amplifier is grounded; and a sixth pin (6) of the differential amplifier is connected with the comparison unit.
The embodiment of the utility model provides a noninvasive sphygmomanometer leads detection circuitry that drops through setting up an instrument operational amplification unit for can effectually get rid of the common mode interference when carrying out signal amplification with received drop voltage signal, and can effectually provide wide voltage detection scope through this components and parts.
Based on the content of the above embodiment, as an alternative embodiment, the first pin (1) of the differential amplifier is connected to one end of the resistor R10, and the other end of the resistor R10 is connected to the eighth pin (8) of the differential amplifier.
In this embodiment, the resistor 10 may be configured as a sliding rheostat, and the differential amplification factor of the differential amplifier U4 can be effectively adjusted by adjusting different resistance values.
Based on the content of the above embodiment, as shown in fig. 3, as an alternative embodiment, the comparing unit mainly includes a comparator U3; the first input end (4) of the comparator is connected with the sixth pin (6) of the differential amplifier U4; a second input end (5) of the comparator U3 is connected with one end of the resistor R7 and one end of the resistor R11, the other end of the resistor R11 is grounded, and the other end of the resistor R7 is connected with the anode of the external direct-current power supply; the output terminal (2) of the comparator U3 is used for outputting the logic level signal.
As another embodiment, the connection relationship of the first input end (4) and the second output end (5) can be interchanged.
Further, the magnitude of the drop-off reference voltage connected to the second input terminal of the comparator may be set according to the magnitude of the resistors R7 and R11.
Since the comparators are all open-drain output, in this embodiment, a pull-up resistor R8 is added to the output terminal of the comparator to strengthen the transmitted logic level signal.
The embodiment of the utility model provides a through setting up the comparative unit, through the drop voltage signal with anomalous process after enlargiing, convert the logic level signal into, be convenient for audio-visual demonstration and read.
Based on the content of above-mentioned embodiment, as shown in fig. 3, the embodiment of the present invention provides a invasive sphygmomanometer lead drop detection circuit, further comprising an optical coupling unit, wherein the optical coupling unit is used for performing photoelectric isolation on a logic level signal and outputting a detection current signal according to a received logic level signal.
Because the invasive sphygmomanometer lead drop detection circuit provided in the embodiment is used for monitoring the invasive sphygmomanometer, an external application device part for further processing and analyzing the logic level signal may be connected with the mains supply, thereby causing hidden danger to the safety of a monitored person. In order to ensure the safety of the monitored person, effective human-electric isolation needs to be achieved. In the embodiment, the logic level signal output by the comparator U3 is connected into the optical coupling unit, so that the photoelectric isolation of the application device part is realized.
Further, as shown in fig. 3, the optical coupler unit mainly includes an optical coupler U2; a first input end (1) of the optical coupler U2 is connected with one end of a resistor R6, and the other end of the resistor R6 is grounded; a second input end (2) of the optical coupler is connected with one end of a capacitor C4, one end of a resistor R8 and an output end (2) of a comparator U3, the other end of the capacitor C4 is grounded, and the other end of the resistor R8 is connected with the anode of an external direct-current power supply; a first output end (15) of the optical coupler and a second output end (16) of the optical coupler are used for outputting a detection current signal, the first output end (15) of the optical coupler is connected with one end of a resistor R9, and the other end of the resistor R9 is grounded; and a second output end (16) of the optical coupler is connected with an optical coupler driving power supply.
Under the action of the optical coupler, a logic level signal received by the input end of the optical coupler is converted into a corresponding detection current signal, and the detection current signal is output through a first output end (15).
Based on the content of the above embodiment, as shown in fig. 3, in the invasive sphygmomanometer lead drop detection circuit provided by the embodiment of the present invention, the invasive sphygmomanometer further includes an indication unit, where the indication unit includes a display device and an audible and visual alarm; the indicating unit is connected with the first output end of the optical coupler.
Further, the voltage regulator unit in the above embodiment may be selected as a precision voltage regulator TL43, and the operational amplifier may be selected as an LF351 operational amplifier; the PNP triode can be selected as an IBP RF triode, the differential amplifier can be selected as an INA128 amplifier, the comparator can be selected as an LM339 comparator, and the optical coupler can be selected as a TLP521 coupler.
Specifically, fig. 4 is the utility model provides a schematic diagram of the accurate steady voltage source TL43 of TL43, wherein first picture is the outside shape structure picture, including steady voltage source main part and 3 pins, is respectively: a reference electrode R, an anode a and a cathode K. The middle diagram is an electrical component diagram, and the last diagram is a pin diagram.
Fig. 5 is a schematic voltage distribution diagram of a TL43 precision voltage regulator according to an embodiment of the present invention; FIG. 5 shows the current flow and voltage distribution within a TL43 precision regulator by setting the R1 and R2 according to the input voltage (input or V)KA) Providing an accurate output voltage (V)ref) And an output current (I)ref)。
Fig. 6 is an internal structural diagram of an LF351 operational amplifier according to an embodiment of the present invention; as shown in fig. 6, the VCC terminal is used for receiving the trigger voltage, and may amplify the input voltage (-VEE) to output the voltage VO.
Fig. 7 is an internal structural diagram of an INA128 amplifier according to an embodiment of the present invention; as shown in fig. 7, wherein the magnification G can be obtained by setting R using the formula shown in the figureGIs set.
Fig. 8 is an internal structure diagram of an LM339 comparator according to an embodiment of the present invention, as shown IN fig. 8, the comparator according to this embodiment can be used to compare voltages of two input terminals (IN +, IN-) to determine whether a corresponding level signal is output at an output terminal (OUT).
Based on the content of the above embodiments, as an optional embodiment, with reference to fig. 1 and fig. 2, a resistance value of the resistor R1 is 51 Ω/1W, a resistance value of the resistor R2 is 1K Ω, a resistance value of the resistor R3 is 1K Ω, a resistance value of the resistor R4 is 20K Ω, a resistance value of the resistor R5 is 9.1K Ω, a resistance value of the resistor R6 is 3.6K Ω, a resistance value of the resistor R7 is 5.9K Ω, a resistance value of the resistor R8 is 300K Ω, a resistance value of the resistor R9 is 10K Ω, a resistance value of the resistor R10 is 5.9K Ω, and a resistance value of the resistor R11 is 5.9K Ω; the capacitance of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 are all 0.1 muF.
Through the reasonable selection of all the resistors and the capacitors, the wide voltage detection range is realized and the reference voltage is adjustable while the lead falling is effectively detected. Moreover, the voltage at two ends of the triode is amplified by the instrument operational amplifier and compared with the resistance value in the designed voltage division circuit, so that the measurement precision is convenient and accurate; meanwhile, the operational amplifier element is used for providing stable power supply voltage, and meanwhile, the triode element is used for increasing the current output capacity of the power supply end, no power frequency interference is introduced, the circuit structure is simple and stable, and the influence of the environment is small.
The above-described apparatus embodiments are merely illustrative, wherein the units described as separate components may or may not be physically separate. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (10)
1. A circuit for detecting the lead drop of an invasive sphygmomanometer, comprising: a power supply circuit and a lead fall-off detection circuit electrically connected to each other;
the power supply circuit is used for acquiring the state of the leads of the invasive sphygmomanometer, converting the state into a drop voltage signal and transmitting the drop voltage signal to the lead drop detection circuit;
the lead falling detection circuit comprises an instrument operation amplification unit and a comparison unit which are electrically connected in sequence;
the instrument operation amplification unit is used for removing common-mode interference from the falling voltage signal and then performing differential voltage amplification processing to obtain a differential amplified voltage signal;
and the comparison unit is used for comparing the differential amplification voltage signal with the drop reference voltage and then outputting a logic level signal.
2. The invasive sphygmomanometer lead drop detection circuit according to claim 1, wherein the power supply circuit comprises a voltage regulator unit, an operational amplifier and a PNP triode which are electrically connected;
the anode of the voltage-stabilizing source unit is connected with one end of a resistor R5 and is grounded; the cathode of the voltage stabilizing source unit is connected with the homodromous input pin of the operational amplifier, one end of a resistor R4 and one end of a resistor R2; a reference electrode of the voltage stabilizing source unit is connected with the other end of the resistor R4 and the other end of the resistor R5;
the inverted input pin of the operational amplifier is connected with the output pin of the operational amplifier and one end of a resistor R3; a fourth pin of the operational amplifier is grounded; a seventh pin of the operational amplifier is connected with an anode of an external direct-current power supply, one end of a capacitor C1 and the other end of the resistor R2, and the other end of the capacitor C1 is grounded;
the projecting pole of PNP triode is connected the invasive sphygmomanometer leads, the base of PNP triode is connected the other end of resistance R3, the one end of PNP triode's collecting electrode connecting resistance R1, resistance R1's the other end is connected external DC power supply's positive pole.
3. The invasive sphygmomanometer lead drop-out detection circuit according to claim 2, wherein the instrument operational amplification unit mainly comprises a differential amplifier;
the second pin and the third pin of the differential amplifier are respectively connected with the emitter of the PNP triode and the collector of the PNP triode;
a fourth pin of the differential amplifier is connected with one end of a capacitor C2 and the negative electrode of the external direct-current power supply, and the other end of the capacitor C2 is grounded;
a fifth pin of the differential amplifier is grounded;
and the sixth pin of the differential amplifier is connected with the comparison unit.
4. The invasive sphygmomanometer lead drop detection circuit according to claim 3, wherein the first pin of the differential amplifier is connected to one end of a resistor R10, and the other end of the resistor R10 is connected to the eighth pin of the differential amplifier.
5. The invasive sphygmomanometer lead drop-out detection circuit according to claim 3, wherein the comparison unit mainly comprises a comparator;
a first input end of the comparator is connected with a sixth pin of the differential amplifier;
the second input end of the comparator is connected with one end of a resistor R7 and one end of a resistor R11, the other end of the resistor R11 is grounded, and the other end of the resistor R7 is connected with the anode of the external direct-current power supply;
and the output end of the comparator is used for outputting the logic level signal.
6. The invasive sphygmomanometer lead drop detection circuit according to claim 5, further comprising an optical coupling unit, wherein the optical coupling unit is configured to perform optoelectronic isolation on the logic level signal and output a detection current signal according to the logic level signal.
7. The invasive sphygmomanometer lead drop detection circuit according to claim 6, wherein the optical coupling unit mainly comprises an optical coupler;
a first input end of the optical coupler is connected with one end of a resistor R6, and the other end of the resistor R6 is grounded;
a second input end of the optical coupler is connected with one end of a capacitor C4, one end of a resistor R8 and an output end of the comparator, the other end of the capacitor C4 is grounded, and the other end of the resistor R8 is connected with the anode of the external direct-current power supply;
the first output end of the optical coupler and the second output end of the optical coupler are used for outputting the detection current signal, the first output end of the optical coupler is connected with one end of a resistor R9, and the other end of the resistor R9 is grounded;
and the second output end of the optical coupler is connected with an optical coupler driving power supply.
8. The invasive sphygmomanometer lead drop-out detection circuit according to claim 7, further comprising an indication unit, the indication unit comprising a display device and an audible and visual alarm;
the indicating unit is connected with a first output end of the optical coupler.
9. The invasive sphygmomanometer lead drop detection circuit according to claim 8,
the voltage-stabilizing source unit is a precision voltage-stabilizing source TL43, and the operational amplifier is an LF351 operational amplifier; the PNP triode is an IBP RF triode, the differential amplifier is an INA128 amplifier, the comparator is an LM339 comparator, and the optical coupler is a TLP521 coupler.
10. The invasive sphygmomanometer lead drop detection circuit according to claim 9, wherein the resistance of the resistor R1 is 51 Ω/1W, the resistance of the resistor R2 is 1K Ω, the resistance of the resistor R3 is 1K Ω, the resistance of the resistor R4 is 20K Ω, the resistance of the resistor R5 is 9.1K Ω, the resistance of the resistor R6 is 3.6K Ω, the resistance of the resistor R7 is 5.9K Ω, the resistance of the resistor R8 is 300K Ω, the resistance of the resistor R9 is 10K Ω, the resistance of the resistor R10 is 5.9K Ω, and the resistance of the resistor R11 is 5.9K Ω; the capacitance of the capacitor C1, the capacitor C2, the capacitor C3 and the capacitor C4 is 0.1 muF.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922002306.1U CN211318711U (en) | 2019-11-19 | 2019-11-19 | Invasive sphygmomanometer lead falling detection circuit |
Applications Claiming Priority (1)
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