CN115729300A - Signal conditioning circuit, life monitoring device and electronic equipment - Google Patents
Signal conditioning circuit, life monitoring device and electronic equipment Download PDFInfo
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- CN115729300A CN115729300A CN202211456625.XA CN202211456625A CN115729300A CN 115729300 A CN115729300 A CN 115729300A CN 202211456625 A CN202211456625 A CN 202211456625A CN 115729300 A CN115729300 A CN 115729300A
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Abstract
The application discloses signal conditioning circuit, life monitoring devices and electronic equipment, this signal conditioning circuit electricity is connected to life monitoring devices, includes: the voltage follower circuit is used for receiving the vital sign signal and reducing the impedance of the vital sign signal; the operational amplification circuit is connected with the voltage following circuit and the life monitoring device and is used for amplifying the amplitude of the vital sign signal and transmitting the amplified vital sign signal to the life monitoring device; and the operational amplifier adjusting circuit is connected with the operational amplifying circuit, is used for being connected with the operational amplifying circuit and is used for receiving the adjusting instruction and adjusting the amplification factor of the operational amplifying circuit according to the adjusting instruction so as to adjust the amplitude of the amplified vital sign signal to the preset amplitude range of the vital monitoring device. The method and the device can improve the detection accuracy of the vital sign signals and reduce the influence of the transfer of the use scene on the detection accuracy of the vital sign signals.
Description
Technical Field
The application relates to the technical field of health monitoring, in particular to a signal regulating circuit, a life monitoring device and electronic equipment.
Background
At present, in a life monitoring device in the related art, the quality of an acquired vital sign signal is easily affected by a use scene. The main reason is that the life monitoring device in the related art is designed according to a single use scene or electronic equipment, especially, a circuit for acquiring a vital sign signal in the life monitoring device fixes the amplification factor of the signal according to the use scene, so that the amplitude of the acquired vital sign signal is low after the use scene is changed, the detection accuracy of the vital sign signal is low, and the subsequent effect of detecting the state of the vital sign according to the vital sign signal is influenced.
Disclosure of Invention
In view of this, the present application provides a signal conditioning circuit, a vital monitoring device and an electronic apparatus for reducing the influence of the shift of the usage scenario on the detection accuracy of the vital sign signal. The technical scheme of the application is as follows:
a signal conditioning circuit electrically connected to a life monitoring device, the signal conditioning circuit comprising: a voltage follower circuit for receiving a vital sign signal and reducing an impedance of the vital sign signal; the operational amplification circuit is connected with the voltage following circuit and the life monitoring device and is used for amplifying the amplitude of the vital sign signal and transmitting the amplified vital sign signal to the life monitoring device; and the operational amplifier adjusting circuit is connected with the operational amplifying circuit and is used for receiving an adjusting instruction and adjusting the amplification factor of the operational amplifying circuit according to the adjusting instruction, so that the amplitude of the amplified vital sign signal is adjusted to the preset amplitude range of the life monitoring device.
In one embodiment, the operational amplifier circuit includes a first operational amplifier and a first resistor; the inverting input end of the first operational amplifier is connected with the voltage follower circuit through the first resistor, the non-inverting input end of the first operational amplifier is grounded, and the output end of the first operational amplifier is used for being connected with the life monitoring device.
In one embodiment, the signal adjusting circuit further includes a control circuit, and the control circuit is connected to the operational amplifier adjusting circuit and configured to output the adjusting instruction to the operational amplifier adjusting circuit.
In one embodiment, the operational amplifier adjusting circuit comprises a digital potentiometer, a first capacitor and a first power supply; a first pin of the digital potentiometer is connected to the first power supply and is grounded through the first capacitor; a second pin of the digital potentiometer is grounded; a third pin and a fourth pin of the digital potentiometer are connected to the control circuit; a fifth pin of the digital potentiometer is connected to the inverting input end of the first operational amplifier; and a sixth pin of the digital potentiometer is connected to the output end of the first operational amplifier.
In one embodiment, the operational amplifier regulating circuit comprises eight analog switches, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a second power supply and a third power supply; a first pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the second resistor; a second pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the third resistor; a third pin of the eight-way analog switch is connected to the inverting input end of the first operational amplifier; a fourth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the fourth resistor; a fifth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the fifth resistor; a sixth pin and an eighth pin of the eight-way analog switch are grounded; a seventh pin of the eight-way analog switch is connected to the third power supply; a ninth pin, a tenth pin and an eleventh pin of the eight-way analog switch are connected to the control circuit; a twelfth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the sixth resistor; a thirteenth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the seventh resistor; a fourteenth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the eighth resistor; a fifteenth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the ninth resistor; and a sixteenth pin of the eight-way analog switch is connected to the second power supply and is grounded through the second capacitor.
In one embodiment, the voltage follower circuit comprises a second operational amplifier, a third capacitor, a fourth power supply and a fifth power supply; the positive phase input end of the second operational amplifier is used for receiving the vital sign signal; the inverting input end of the second operational amplifier is connected to the output end of the second operational amplifier; the output end of the second operational amplifier is connected to the operational amplification circuit; the positive power supply end of the second operational amplifier is connected to the fourth power supply and is grounded through the third capacitor; and the negative electrode power supply end of the second operational amplifier is connected to the fifth power supply and is grounded through the fourth capacitor.
In one embodiment, the signal conditioning circuit further comprises: the voltage follower circuit receives the vital sign signals through the surge protection circuit, and the surge protection circuit is used for filtering transient voltage signals in the vital sign signals.
In one embodiment, the surge protection circuit includes a tenth resistor and an electrostatic protection diode; a first end of the tenth resistor is connected to a receiving end of the vital sign signal and connected to the voltage follower circuit, and a second end of the tenth resistor is grounded; the first end of the electrostatic protection diode is connected to the receiving end of the vital sign signal and connected to the voltage follower circuit, and the second end of the electrostatic protection diode is grounded.
In a second aspect, the present application provides a life monitoring device, which includes a receiving end, a sign state determining circuit, and the signal conditioning circuit; the receiving end is used for receiving the vital sign signals, the sign state judging circuit is used for obtaining corresponding sign state information according to the vital sign signals, and the signal adjusting circuit is used for adjusting the amplitude of the vital sign signals to a preset amplitude range of the vital monitoring device.
In a third aspect, the present application provides an electronic device, comprising a vital sign sensor and the vital monitoring apparatus; the vital sign sensor is used for acquiring the vital sign signal.
The beneficial effect that technical scheme that this application provided brought includes at least:
the operational amplification circuit is adjusted through the operational amplifier adjusting circuit, so that the amplitude of the vital sign signal can be flexibly adjusted, the vital sign signal is adjusted to a preset amplitude range required by the vital monitoring device, the detection accuracy of the vital sign signal is improved, and the influence of the transfer of a use scene on the detection accuracy of the vital sign signal is reduced.
Drawings
Fig. 1 is a schematic structural diagram of a sleep monitoring device according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure.
Fig. 3 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure.
Fig. 4 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure.
Fig. 6 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure.
Fig. 7 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure.
Fig. 8 is a schematic structural diagram of a life monitoring device according to an embodiment of the present disclosure.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
DESCRIPTION OF SYMBOLS IN THE DRAWINGS
100-a sleep monitoring device; 110-a piezoelectric sensor; 120-a life monitoring device;
200-signal conditioning circuitry-; 210-a voltage follower circuit; 220-an operational amplifier circuit; 230-an operational amplifier regulating circuit; 240-a control circuit;
300-signal conditioning circuitry-; 310-a voltage follower circuit; 320-operational amplifier circuit; 330-an operational amplifier regulating circuit; 340-a control circuit; 321-a first operational amplifier; 322-a first resistance; 331-a digital potentiometer; 332-a first capacitance; 333-a first power supply;
400-signal conditioning circuit-; 410-a voltage follower circuit; 420-operational amplifier circuit; 430-an operational amplifier regulating circuit; 440-a control circuit; 421-a first operational amplifier; 422-a first resistance; 4301-eight analog switchers; 4302-second resistance; 4303-third resistance; 4304-fourth resistance; 4305-fifth resistance; 4306-sixth resistance; 4307-seventh resistance; 4308-eighth resistance; 4309-ninth resistance; 4310-second capacitance; 4311-second power supply; 4312-third power supply;
500-signal conditioning circuitry-; 510-a voltage follower circuit; 520-operational amplifier circuit; 530-an operational amplifier adjusting circuit; 540-a control circuit; 511-a second operational amplifier; 512-third capacitance; 513-a fourth capacitance; 514-a fourth power supply; 515-a fifth power supply;
500-signal conditioning circuitry-; 510-a voltage follower circuit; 520-operational amplification circuit; 530-an operational amplifier regulating circuit; 540-a control circuit; 650-surge protection circuit; 651-tenth resistance; 652-electrostatic protection diode;
700-a life monitoring device; 710-a receiving end; 720-signal conditioning circuitry; 730-sign state judgment circuit;
800-an electronic device; 810-vital signs sensors; 820-life monitoring device.
Detailed Description
In the embodiments of the present application, "at least one" means one or more, "and" a plurality "means two or more than two. "and/or" describes the association relationship of the associated object, indicating that there may be three relationships, for example, a and/or B may represent: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural. The terms "first," "second," "third," "fourth," and the like in the description and in the claims and drawings of the present application, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
It is further noted that the methods shown in the methods or flowcharts disclosed in the embodiments of the present application include one or more steps for implementing the methods, and the execution orders of the steps may be interchanged with each other, and some steps may be deleted without departing from the scope of the claims.
At present, the quality of a vital sign signal acquired by a vital monitoring device in the related art is relatively easily influenced by a use scene. The main reason is that the life monitoring device in the related art is designed according to a single use scene or electronic equipment, especially, a circuit for acquiring the vital sign signal in the life monitoring device fixes the amplification factor of the signal according to the use scene, so that the amplitude of the acquired vital sign signal is often lower after the use scene is changed, the detection accuracy of the vital sign signal is lower, and the subsequent effect of detecting the state of the vital sign according to the vital sign signal is influenced. The life monitoring device can be applied to sleep monitoring equipment.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a sleep monitoring apparatus 100 according to an embodiment of the present disclosure, which includes a piezoelectric sensor 110 and a life monitoring device 120. The piezoelectric sensor 110 can be laid on the mattress for receiving the body movement signal of the user during sleeping and converting the body movement signal into the vital sign signal. The vital sign signal is received by the vital monitoring device 120 and processed.
However, the vital sign signals acquired by the piezoelectric sensor 110 are relatively easily affected by the usage scenario, for example, in a scenario where the mattress is relatively hard, the deformation amplitude of the piezoelectric sensor 110 is relatively small, and the intensity of the acquired vital sign signals is relatively low at this time, and if the vital sign signals acquired by the vital monitoring device 120 are directly processed, the sleep state cannot be accurately detected. Meanwhile, in the soft scene of the mattress, the deformation amplitude of the piezoelectric sensor 110 is large, the strength of the acquired vital sign signal is large, and the vital sign signal is prone to be misjudged as a continuous body movement state when being used for detecting the sleep state, so that the detection result is influenced. In addition, the deformation amplitudes of the piezoelectric sensor 110 are different when users with different weights use the device, and the detection result is also affected.
Therefore, the present application provides a signal conditioning circuit for conditioning a vital sign signal to a preset amplitude range of a vital monitoring device, so as to reduce the influence of the shift of a usage scenario on the detection accuracy of the vital sign signal.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure, in which the signal conditioning circuit 200 is electrically connected to a life monitoring device, and includes a voltage follower circuit 210, an operational amplifier circuit 220, an operational amplifier circuit 230, and a control circuit 240.
And the voltage following circuit 210, wherein the voltage following circuit 210 is connected with a receiving end of the vital sign signal, and is used for receiving the vital sign signal and reducing the impedance of the vital sign signal.
In an embodiment of the present application, the vital sign signals are analog signals and acquired by a vital sign sensor. The vital sign sensor may include a combination of at least one sensor such as a body temperature sensor, a body motion sensor, a respiration sensor, and a pulse sensor, for example, the body temperature sensor may be a temperature sensitive resistance sensor, and the body motion sensor may be a piezoelectric sensor, and the like, which is not limited herein.
The vital sign signal is an analog signal, and the impedance of the sensor is particularly large in a resistance type sensor such as a temperature-sensitive resistor and a piezoelectric sensor. Therefore, after the vital sign signal is received, the impedance of the voltage follower circuit 210 can be effectively reduced, so that the signal interference after the vital sign signal is transmitted to the next stage circuit is reduced.
The operational amplifier circuit 220, the operational amplifier circuit 220 is connected with the voltage follower circuit 210 and the life monitoring device, and is used for amplifying the amplitude of the vital sign signal and transmitting the amplified vital sign signal to the life monitoring device.
In the embodiment of the present application, since the intensity of the initial signal generated by the vital sign sensor is relatively weak, that is, the amplitude of the initial vital sign signal is relatively low, the signal amplitude needs to be amplified by the operational amplifier circuit 220, and then the vital sign signal is easily converted into a digital signal, and is easily subjected to algorithm processing in the vital monitoring device.
The amplification factor of the operational amplifier circuit 220 is not fixed, and after receiving the analog adjustment signal, the amplification factor can be adjusted according to the analog adjustment signal, so that the amplitude of the finally output vital sign signal meets the requirement of the vital monitoring device.
And the operational amplifier adjusting circuit 230, wherein the operational amplifier adjusting circuit 230 is connected to the operational amplifier circuit 220, and is configured to receive an adjusting instruction and adjust an amplification factor of the operational amplifier circuit 220 according to the adjusting instruction, so that the amplitude of the amplified vital sign signal is adjusted to a preset amplitude range of the life monitoring device.
In this embodiment, the adjusting instruction may be a digital signal, and after receiving the adjusting instruction, the operational amplifier adjusting circuit 230 generates a corresponding analog adjusting signal according to the adjusting instruction, so as to transmit the analog adjusting signal to the operational amplifier circuit 220, so that the operational amplifier circuit 220 adjusts the corresponding amplification factor, thereby adjusting the amplitude of the vital sign signal to a preset amplitude range.
Wherein, this preset amplitude range can be a fixed range, when going to use this life monitoring device in different scenes promptly, can adjust the vital sign signal that obtains to this preset amplitude range through this signal conditioning circuit 200 to can eliminate the influence of different scenes to the detection precision of vital sign signal.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure, and compared with fig. 2, the signal conditioning circuit 200 in fig. 3 further includes a control circuit 240.
And the control circuit 240, the control circuit 240 is connected to the operational amplifier regulating circuit 230, and is configured to output a regulating instruction to the operational amplifier regulating circuit 230.
In this embodiment, the control circuit 240 may include a control Unit including, but not limited to, an MCU (Micro controller Unit), a DSP (Digital Signal Processing/Processor), an MPU (Micro Processor Unit), and the like, and the present embodiment does not specifically limit the control Unit.
The adjustment instruction may be pre-stored in the control circuit 240, that is, the control circuit 240 further includes a storage medium connected to the control unit. For example, the storage medium may store a plurality of adjustment instructions, and the amplification factor corresponding to each adjustment instruction is different, and the control unit may select the adjustment instruction to transmit to the operational amplifier adjustment circuit 230. Moreover, the control unit may be connected to the output end of the operational amplifier circuit 220 to collect the vital sign signal, and select a corresponding adjustment instruction according to the strength of the vital sign signal, i.e., form a closed-loop control.
In the embodiment of the present application, the signal conditioning circuit adjusts the amplification factor of the operational amplifier circuit 220 through the operational amplifier conditioning circuit 230, so that the amplitude of the vital sign signal can be flexibly adjusted, the vital sign signal is adjusted to the preset amplitude range required by the life monitoring device, the detection accuracy of the vital sign signal is improved, and the influence of the transfer of the use scene on the detection accuracy of the vital sign signal is reduced.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a signal conditioning circuit 300 according to an embodiment of the present disclosure, where the signal conditioning circuit includes a voltage follower circuit 310, an operational amplifier circuit 320, an operational amplifier circuit 330, and a control circuit 340.
The voltage follower circuit 310 and the control circuit 340 are the same as or similar to the voltage follower circuit 210 and the control circuit 240 in fig. 2, and reference may be made to the description of the voltage follower circuit 210 and the control circuit 240 in fig. 2, and the description thereof is omitted here for brevity. It is understood that the signal conditioning circuit 300 shown in fig. 3 differs from the signal conditioning circuit 200 shown in fig. 2 in the operational amplifier circuit 320 and the operational amplifier circuit 330.
In the embodiment of the present application, the operational amplifier circuit 320 includes a first operational amplifier 321, and a first resistor 322; the inverting input terminal of the first operational amplifier 321 is connected to the voltage follower circuit through the first resistor 322, the non-inverting input terminal of the first operational amplifier 321 is grounded, and the output terminal of the first operational amplifier 321 is used for connecting to the life monitoring device.
In the embodiment of the present application, the operational amplifier adjustment circuit 330 includes a digital potentiometer 331, a first capacitor 332, and a first power source 333; a first pin of the digital potentiometer 331 is connected to the first power source 333 and is grounded through the first capacitor 332; the second pin of the digital potentiometer 331 is grounded; the third pin and the fourth pin of the digital potentiometer 331 are connected to the control circuit; the fifth pin of the digital potentiometer 331 is connected to the inverting input terminal of the first operational amplifier 321; the sixth pin of the digital potentiometer 331 is connected to the output terminal of the first operational amplifier 321.
The control circuit 340 transmits an adjustment command to the digital potentiometer 331 through the third pin and the fourth pin, so as to adjust a resistance between the fifth pin and the sixth pin of the digital potentiometer 331, thereby adjusting the amplification factor of the first operational amplifier 321. Assuming that the resistance of the first resistor 322 is R1 and the resistance between the fifth pin and the sixth pin of the digital potentiometer 331 is Rf, the resistance is
Referring to fig. 5, fig. 5 is a schematic structural diagram of a signal conditioning circuit 400 according to an embodiment of the present disclosure, where the signal conditioning circuit 400 includes a voltage follower circuit 410, an operational amplifier circuit 420, an operational amplifier circuit 430, and a control circuit 440.
The voltage follower circuit 410, the operational amplifier circuit 420, and the control circuit 440 are the same as or similar to the voltage follower circuit 310, the operational amplifier circuit 320, and the control circuit 340 in fig. 3, and reference may be made to the description of the voltage follower circuit 310, the operational amplifier circuit 320, and the control circuit 340 in fig. 3, which is not repeated herein. It will be appreciated that the signal conditioning circuit 400 shown in fig. 4 differs from the signal conditioning circuit 300 shown in fig. 3 by the operational amplifier conditioning circuit 430.
In the present embodiment, the operational amplifier circuit 420 includes a first operational amplifier 421 and a first resistor 422.
In the embodiment of the present application, the operational amplifier adjusting circuit 430 includes eight analog switches 4301, a second resistor 4302, a third resistor 4303, a fourth resistor 4304, a fifth resistor 4305, a sixth resistor 4306, a seventh resistor 4307, an eighth resistor 4308, a ninth resistor 4309, a second capacitor 4310, a second power source 4311, and a third power source 4312;
a first pin of the eight analog switches 4301 is connected to an output terminal of the first operational amplifier 421 through a second resistor 4302; the second pin of the eight analog switches 4301 is connected to the output terminal of the first operational amplifier 421 through a third resistor 4303; the third pin of the eight-way analog switch 4301 is connected to the inverting input terminal of the first operational amplifier 421; a fourth pin of the eight-way analog switch 4301 is connected to the output end of the first operational amplifier 421 through a fourth resistor 4304; a fifth pin of the eight-way analog switch 4301 is connected to an output end of the first operational amplifier 421 through a fifth resistor 4305; the sixth pin and the eighth pin of the eight-way analog switch 4301 are grounded; a seventh pin of the eight-way analog switch 4301 is connected to a third power supply 4312; a ninth pin, a tenth pin and an eleventh pin of the eight-way analog switch 4301 are connected to the control circuit; a twelfth pin of the eight-way analog switch 4301 is connected to the output end of the first operational amplifier 421 through a sixth resistor 4306; a thirteenth pin of the eight-way analog switch 4301 is connected to the output end of the first operational amplifier 421 through a seventh resistor 4307; a fourteenth pin of the eight-way analog switch 4301 is connected to the output end of the first operational amplifier 421 through an eighth resistor 4308; a fifteenth pin of the eight analog switches 4301 is connected to the output terminal of the first operational amplifier 421 through a ninth resistor 4309; the sixteenth pin of the eight-way analog switch 4301 is connected to the second power source 4311 and grounded through the second capacitor 4310.
The resistance values of the second resistor 4302, the third resistor 4303, the fourth resistor 4304, the fifth resistor 4305, the sixth resistor 4306, the seventh resistor 4307, the eighth resistor 4308, and the ninth resistor 4309 are different.
That is, the control circuit 440 may transmit a regulation instruction to the eight-way analog switch 4301, so that the eight-way analog switch 4301 selects one of the pins connected with the resistor according to the regulation instruction, and closes the pin with the third pin. Thereby adjusting the amplification of the first operational amplifier 421. For example, the control circuit 440 transmits a high level to the ninth pin and the tenth pin, and transmits a low level to the eleventh pin, so that the second pin and the third pin of the eight-way analog switch 4301 can be controlled to be closed.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure, in which the signal conditioning circuit 500 includes a voltage follower circuit 510, an operational amplifier circuit 520, an operational amplifier circuit 530, and a control circuit 540.
The operational amplifier circuit 520, the operational amplifier adjusting circuit 530, and the control circuit 540 are the same as or similar to the operational amplifier circuit 220, the operational amplifier adjusting circuit 230, and the control circuit 240 in fig. 2, and reference may be made to the description of the operational amplifier circuit 220, the operational amplifier adjusting circuit 230, and the control circuit 240 in fig. 2, which is not repeated herein. It will be appreciated that the signal conditioning circuit 500 shown in fig. 4 differs from the signal conditioning circuit 200 shown in fig. 2 by a voltage follower circuit 510.
In the embodiment of the present application, the voltage follower circuit 510 includes a second operational amplifier 511, a third capacitor 512, a fourth capacitor 513, a fourth power supply 514, and a fifth power supply 515; the positive phase input end of the second operational amplifier 511 is connected to the receiving end of the vital sign signal; the inverting input terminal of the second operational amplifier 511 is connected to the output terminal of the second operational amplifier 511; the output end of the second operational amplifier 511 is connected to the operational amplifier circuit; the positive power supply terminal of the second operational amplifier 511 is connected to the fourth power supply 514 and is grounded through the third capacitor 512; a negative power source terminal of the second operational amplifier 511 is connected to a fifth power source 515 and is grounded through a fourth capacitor 513.
The inverting input terminal of the second operational amplifier 511 is connected to the output terminal to form a voltage follower, and the impedance of the vital sign signal can be effectively reduced after the vital sign signal is processed by the voltage follower, so that signal interference caused by the impedance in the subsequent signal processing process is reduced. The fourth power supply 514 supplies power to the positive electrode of the second operational amplifier 511, and the third capacitor 512 can filter out noise in the fourth power supply 514 to prevent the noise from affecting vital sign signals. Similarly, the fifth power supply 515 supplies power to the negative electrode of the second operational amplifier 511, and the fourth capacitor 513 can filter out noise in the fifth power supply 515 to prevent the noise from affecting the vital sign signal.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a signal conditioning circuit according to an embodiment of the present disclosure, in which the signal conditioning circuit 600 includes a voltage follower circuit 610, an operational amplifier circuit 620, an operational amplifier circuit 630, a control circuit 640, and a surge protection circuit 650.
The voltage follower circuit 610, the operational amplifier circuit 620, the operational amplifier adjusting circuit 630, and the control circuit 640 are the same as or similar to those of the foregoing embodiments, and reference may be made to the corresponding contents of the foregoing embodiments, which are not repeated herein.
In the embodiment of the present application, the surge protection circuit 650, the voltage follower circuit 610 is connected to the receiving end of the vital sign signal through the surge protection circuit 650, and the surge protection circuit 650 is configured to filter the transient voltage signal in the vital sign signal.
The surge protection circuit 650 includes a tenth resistor 651 and an electrostatic protection diode 652; a first end of the tenth resistor 651 is connected to a receiving end of the vital sign signal and connected to the voltage follower circuit, and a second end of the tenth resistor 651 is grounded; a first terminal of the esd diode 652 is connected to a receiving terminal of the vital sign signal and to the voltage follower circuit, and a second terminal of the esd diode 652 is grounded. The esd protection diode 652 is used to prevent electrostatic or transient voltage breakdown of the operational amplifier elements in the voltage follower circuit 610.
Please refer to fig. 8, fig. 8 is a schematic structural diagram of a life monitoring device according to an embodiment of the present disclosure. The vital monitoring apparatus 700 includes a receiving end 710, a sign status determining circuit 730, and the signal conditioning circuit 720.
Wherein, the receiving end 710 is configured to receive a vital sign signal; the sign state judging circuit 730 is used for obtaining corresponding sign state information according to the vital sign signals; the signal conditioning circuit 720 is configured to adjust the amplitude of the vital sign signal to a preset amplitude range of the vital monitoring device 700.
In the embodiment of the application, the amplification factor of the operational amplifier circuit is adjusted by the operational amplifier adjusting circuit through the signal adjusting circuit 720, so that the amplitude of the vital sign signal can be flexibly adjusted, the vital sign signal is adjusted to the preset amplitude range required by the vital sign state judging circuit 730, the detection accuracy of the vital sign signal is improved, the influence of the transition of a use scene on the detection accuracy of the vital sign signal is reduced, and the accuracy of the vital sign state information output by the vital sign state judging circuit 730 is higher.
Referring to fig. 9, fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present disclosure, where the electronic device 800 includes a vital sign sensor 810 and the vital monitoring apparatus 820; the vital sign sensor is used for acquiring vital sign signals.
The electronic device 800 may be a sleep monitoring device, a health monitoring device, a motion monitoring device, or other electronic devices using human vital sign signals. Through the signal adjusting circuit in the life monitoring device 820, the amplitude of the vital sign signal can be flexibly adjusted, and the vital sign signal is adjusted to a preset amplitude range required by the electronic equipment 800, so that the detection accuracy of the vital sign signal is improved, and the influence of the transfer of a use scene on the accuracy of the electronic equipment 800 is reduced.
The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the design spirit of the present application should fall within the protection scope defined by the claims of the present application.
Claims (10)
1. A signal conditioning circuit electrically connected to a life monitoring device, the signal conditioning circuit comprising:
the voltage follower circuit is used for receiving the vital sign signals and reducing the impedance of the vital sign signals;
the operational amplification circuit is connected with the voltage following circuit and the life monitoring device and is used for amplifying the amplitude of the vital sign signal and transmitting the amplified vital sign signal to the life monitoring device;
and the operational amplifier adjusting circuit is connected with the operational amplifier circuit and is used for receiving an adjusting instruction and adjusting the amplification factor of the operational amplifier circuit according to the adjusting instruction so as to adjust the amplitude of the amplified vital sign signal to the preset amplitude range of the life monitoring device.
2. The signal conditioning circuit of claim 1, wherein the operational amplification circuit comprises a first operational amplifier and a first resistor;
the inverting input end of the first operational amplifier is connected with the voltage follower circuit through the first resistor, the non-inverting input end of the first operational amplifier is grounded, and the output end of the first operational amplifier is used for being connected with the life monitoring device.
3. The signal conditioning circuit of claim 2, wherein the signal conditioning circuit further comprises a control circuit coupled to the op-amp conditioning circuit for outputting the conditioning instruction to the op-amp conditioning circuit.
4. The signal conditioning circuit of claim 3, wherein the operational amplifier conditioning circuit comprises a digital potentiometer, a first capacitor, and a first power supply;
a first pin of the digital potentiometer is connected to the first power supply and is grounded through the first capacitor; a second pin of the digital potentiometer is grounded; a third pin and a fourth pin of the digital potentiometer are connected to the control circuit; a fifth pin of the digital potentiometer is connected to an inverting input end of the first operational amplifier; and a sixth pin of the digital potentiometer is connected to the output end of the first operational amplifier.
5. The signal conditioning circuit of claim 3, wherein the operational amplifier conditioning circuit comprises eight analog switches, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a second capacitor, a second power supply, and a third power supply;
a first pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the second resistor; a second pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the third resistor; a third pin of the eight-way analog switch is connected to the inverting input end of the first operational amplifier; a fourth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the fourth resistor; a fifth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the fifth resistor; a sixth pin and an eighth pin of the eight-way analog switch are grounded; a seventh pin of the eight-way analog switch is connected to the third power supply; a ninth pin, a tenth pin and an eleventh pin of the eight-way analog switch are connected to the control circuit; a twelfth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the sixth resistor; a thirteenth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the seventh resistor; a fourteenth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the eighth resistor; a fifteenth pin of the eight-way analog switch is connected to the output end of the first operational amplifier through the ninth resistor; and a sixteenth pin of the eight-way analog switch is connected to the second power supply and is grounded through the second capacitor.
6. The signal conditioning circuit of claim 1, wherein the voltage follower circuit comprises a second operational amplifier, a third capacitor, a fourth power supply, and a fifth power supply;
the positive phase input end of the second operational amplifier is used for receiving the vital sign signal; the inverting input end of the second operational amplifier is connected to the output end of the second operational amplifier; the output end of the second operational amplifier is connected to the operational amplification circuit; the positive power supply end of the second operational amplifier is connected to the fourth power supply and is grounded through the third capacitor; and the negative electrode power supply end of the second operational amplifier is connected to the fifth power supply and is grounded through the fourth capacitor.
7. The signal conditioning circuit of claim 1, wherein the signal conditioning circuit further comprises:
the voltage follower circuit receives the vital sign signals through the surge protection circuit, and the surge protection circuit is used for filtering transient voltage signals in the vital sign signals.
8. The signal conditioning circuit of claim 7, wherein the surge protection circuit comprises a tenth resistor and an electrostatic protection diode;
a first end of the tenth resistor is connected to a receiving end of the vital sign signal and the voltage follower circuit, and a second end of the tenth resistor is grounded;
the first end of the electrostatic protection diode is connected to the receiving end of the vital sign signal and connected to the voltage follower circuit, and the second end of the electrostatic protection diode is grounded.
9. A life monitoring device, comprising a receiving end, a sign state judging circuit and a signal conditioning circuit according to any one of claims 1 to 8;
the receiving end is used for receiving the vital sign signals, the sign state judging circuit is used for obtaining corresponding sign state information according to the vital sign signals, and the signal adjusting circuit is used for adjusting the amplitudes of the vital sign signals to a preset amplitude range of the vital monitoring device.
10. An electronic device comprising a vital signs sensor and a life monitoring apparatus as claimed in claim 9; the vital sign sensor is used for acquiring the vital sign signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211456625.XA CN115729300A (en) | 2022-11-21 | 2022-11-21 | Signal conditioning circuit, life monitoring device and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211456625.XA CN115729300A (en) | 2022-11-21 | 2022-11-21 | Signal conditioning circuit, life monitoring device and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115729300A true CN115729300A (en) | 2023-03-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211456625.XA Pending CN115729300A (en) | 2022-11-21 | 2022-11-21 | Signal conditioning circuit, life monitoring device and electronic equipment |
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| Country | Link |
|---|---|
| CN (1) | CN115729300A (en) |
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2022
- 2022-11-21 CN CN202211456625.XA patent/CN115729300A/en active Pending
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