CN211187269U - Pulse wave driving circuit of sleep monitor - Google Patents
Pulse wave driving circuit of sleep monitor Download PDFInfo
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- CN211187269U CN211187269U CN201920738668.4U CN201920738668U CN211187269U CN 211187269 U CN211187269 U CN 211187269U CN 201920738668 U CN201920738668 U CN 201920738668U CN 211187269 U CN211187269 U CN 211187269U
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Abstract
The utility model provides a sleep monitor's pulse wave drive circuit, including infrared drive circuit and ruddiness drive circuit, wherein, the external first drive control signal of first input of infrared drive circuit, the second input is connected with digital analog conversion circuit's first output, infrared drive circuit's output and the infrared ray L ED lamp in the blood oxygen probe are connected, the external second drive control signal of first input of ruddiness drive circuit, the second input is connected with digital analog conversion circuit's second output, ruddiness drive circuit's output and the ruddiness L ED lamp in the blood oxygen probe are connected, through implementing the utility model discloses, realized the suppression to mains noise and drive circuit self internal noise to realize the regulation to infrared L ED lamp and ruddiness L ED lamp luminance, and then improved the accuracy of oxyhemoglobin saturation detection result, have luminous stable, strong, the advantage of anti-noise ability, luminance adjustable for traditional drive circuit.
Description
Technical Field
The utility model relates to the technical field of medical equipment, concretely relates to pulse wave drive circuit of sleep monitor.
Background
The sleep monitor can objectively evaluate the sleep quality of a patient, monitor the sleep time, the sleep efficiency and stages by monitoring physiological signals of electrocardio, electrooculogram, myoelectricity and the like of the user in the whole night sleep, eliminate the concept of sleep cognition error, enable the patient to correctly know the sleep problem of the patient, has an objective evaluation and cognition on the sleep quality of the patient, and plays more and more important roles in diagnosing and treating various diseases related to sleep disorders and ensuring the health of people.
When the sleep monitor is collecting the photoplethysmography signal in the user physiological signal to monitor the oxyhemoglobin saturation, need adopt noninvasive transmission formula blood oxygen sensor and the collection that finger clip formula oxyhemoglobin saturation detecting probe realized the photoplethysmography, its principle is that L ED lamp through controlling in the blood oxygen probe carries out alternate light-emitting, in order to obtain the absorbance signal of human finger fingertip, and then convert into the photoplethysmography pulse wave signal, and the tradition carries out the noise and the power frequency interference that the scheme of drive can't effectively restrain drive circuit to L ED lamp, and because the thickness of human fingertip differs, and the luminous intensity of traditional L ED lamp can not adjust, can produce the error to different users, and then influence final oxyhemoglobin saturation's testing result.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a pulse wave drive circuit of sleep monitor to there is the interference of noise and power frequency to the drive method of L ED lamp in the blood oxygen probe among the overcome prior art, and luminous intensity can not be adjusted, thereby influences the problem of oxyhemoglobin saturation testing result accuracy.
The embodiment of the utility model provides a pulse wave drive circuit of sleep monitor, including infrared drive circuit and ruddiness drive circuit, wherein, the external first drive control signal of first input of infrared drive circuit, the second input is connected with digital analog conversion circuit's first output, the output of infrared drive circuit is connected with the infrared ray L ED lamp in the blood oxygen probe, the external second drive control signal of first input of ruddiness drive circuit, the second input with digital analog conversion circuit's second output is connected, ruddiness drive circuit's output with ruddiness L ED lamp in the blood oxygen probe is connected.
Optionally, the infrared light driving circuit includes a first switch, a second switch and a third switch, where a control end of the first switch is externally connected to the first driving control signal, a first end of the first switch is connected to a control end of the second switch and an external dc power supply, a second end of the first switch is grounded, a first end of the second switch is connected to a first end of the third switch and the infrared light L ED lamp, a second end of the second switch is connected to the external dc power supply, a control end of the third switch is connected to a first output end of the digital-to-analog conversion circuit, and a second end of the third switch is grounded.
Optionally, the red light driving circuit includes a fourth switch, a fifth switch and a sixth switch, where a control end of the fourth switch is externally connected to the second driving control signal, a first end of the fourth switch is connected to a control end of the fifth switch and an external dc power supply, a second end of the fourth switch is grounded, a first end of the fifth switch is connected to a first end of the sixth switch and the red light L ED lamp, a second end of the fifth switch is connected to the external dc power supply, a control end of the sixth switch is connected to a second output end of the digital-to-analog conversion circuit, and a second end of the sixth switch is grounded.
Optionally, the infrared light driving circuit further includes: the driving circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein the control end of the first switch is externally connected with the first driving control signal through the first resistor; the first end of the first switch is connected with the external direct-current power supply through the second resistor, and the first end of the first switch is connected with the control end of the second switch through the third resistor; the control end of the third switch is connected with the first output end of the digital-to-analog conversion circuit through the fourth resistor, the control end of the third switch is grounded through the fifth resistor, and the second end of the third switch is grounded through the sixth resistor.
Optionally, the red light driving circuit further includes: the control end of the fourth switch is externally connected with the second driving control signal through the seventh resistor; a first end of the fourth switch is connected with the external direct-current power supply through the eighth resistor, and a first end of the fourth switch is connected with a control end of the fifth switch through the ninth resistor; the control end of the sixth switch is connected with the second output end of the digital-to-analog conversion circuit through the tenth resistor, the control end of the sixth switch is grounded through the eleventh resistor, and the second end of the sixth switch is grounded through the twelfth resistor.
Optionally, the first switch and the third switch are PNP transistors, and the second switch is an NPN transistor.
Optionally, the fourth switch and the sixth switch are PNP transistors, and the fifth switch is an NPN transistor.
Optionally, the digital-to-analog conversion circuit is a T L V5618A chip.
Optionally, the first drive control signal and the second drive control signal are generated by a single chip microcomputer.
The utility model discloses technical scheme has following advantage:
the embodiment of the utility model provides a sleep monitor's pulse wave drive circuit, this circuit includes infrared drive circuit and ruddiness drive circuit and sends out light L ED lamp and ruddiness L ED lamp in turn through external drive control signal drive blood oxygen probe, the luminous luminance is stable, the accessible is gathered adjacent a pair of not giving out light, the signal of telecommunication constantly gives out light by contrast, thereby realize the suppression to mains noise and drive circuit self internal noise, anti-noise ability is strong, and through external digital-to-analog conversion circuit, the regulation to infrared L ED lamp and ruddiness L ED lamp luminance is realized to output current through control digital-to-analog conversion circuit, and then the accuracy of oxyhemoglobin saturation testing result has been improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in 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 pulse wave driving circuit of a sleep monitor according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of the pulse wave driving circuit of the sleep monitor according to the embodiment of the present invention.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, 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 work belong to the protection scope of the present invention.
In the description of the present invention, it is noted that the terms "first", "second", "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides a pulse wave drive circuit of sleep monitor, as shown in figure 1, the pulse wave drive circuit of sleep monitor includes infrared drive circuit 1 and ruddiness drive circuit 2, wherein, the external first drive control signal of first input of infrared drive circuit 1, the second input is connected with digital analog conversion circuit 3's first output, the output of infrared drive circuit 1 is connected with infrared L ED lamp D1 in the blood oxygen probe, the external second drive control signal of first input of ruddiness drive circuit 2, the second input is connected with digital analog conversion circuit 3's second output, the output of ruddiness drive circuit 2 is connected with ruddiness L ED lamp D2 in the blood oxygen probe, in practical application, foretell infrared L ED lamp D1 and ruddiness L ED lamp D2 pass through above-mentioned pulse wave drive circuit control, with the frequency about 2KHz, according to "the red light shines", the luminous "dark glow", the luminous in order of infrared light "," glow "alternately shines".
Through the cooperation in coordination of above-mentioned each component part, the embodiment of the utility model provides a sleep monitor's pulse wave drive circuit has realized the suppression to power noise and drive circuit self internal noise to the realization is to the regulation of infrared light L ED lamp D1 and ruddiness L ED lamp D2 luminance, and then has improved the accuracy of oxyhemoglobin saturation testing result, has the advantage that luminous stability, noise immunity are strong, luminance is adjustable for traditional drive circuit.
The pulse wave driving circuit of the sleep monitor according to the embodiment of the present invention will be described in detail with reference to the specific examples.
The embodiment of the utility model provides a sleep monitor comprises several parts such as host computer, physiological signal sensor, embedded software, state confirmation software, analysis software.
a) The sleep monitor host computer is used for establishing a detection platform by adopting a NXP company high-performance embedded MCU chip L PC1788 as a core, and is responsible for circuit design and realization and finishing the pickup of human physiological signals;
b) the physiological signal sensor: the sensor is used for classifying electroencephalogram, electrocardio, electrooculogram and myoelectricity into weak electrophysiological signals, and the sensor is supposed to adopt a snap-button electrocardio-electrode plate and a lead wire to realize the input of the weak electrophysiological signals of a human body; the blood oxygen saturation monitoring adopts a noninvasive transmission type blood oxygen sensor and a finger-clipped blood oxygen saturation detection probe to realize the collection of the photoelectric volume wave; the respiratory signals adopt 1 group of mouth-nose airflow thermistor sensors, and 2 group of chest-abdomen respiratory binding belts with piezoelectric detection sensors inside to collect respiratory signals;
c) the sleep embedded software comprises the following steps: the sleep embedded software is based on a sleep monitor host hardware platform, completes the acquisition, storage and transmission of all data, defines a communication protocol standard, and realizes the real-time and synchronous display function of all monitored physiological signals together with the sleep state confirmation software;
d) sleep state validation software: the sleep state confirmation software interacts with the sleep embedded software to complete the functions of self-checking state confirmation of the product, display, storage and playback of sleep data signals, connection indication of the sensor and the lead wire, impedance detection and the like;
e) sleep analysis software: the sleep analysis software analyzes and processes the acquired electroencephalogram, myoelectricity, electrooculogram, electrocardio, photoplethysmography and respiratory signals, obtains sleep stages and sleep quality evaluation, and provides data reference for users and doctors.
In a preferred embodiment, as shown in fig. 2, the infrared optical driving circuit 1 includes a first switch K1, a second switch K2 and a third switch K3, wherein a control terminal of the first switch K1 is externally connected to a first driving control signal, a first terminal of the first switch K1 is respectively connected to a control terminal of the second switch K2 and an externally connected dc power source, a second terminal of the first switch K1 is grounded, a first terminal of the second switch K2 is respectively connected to a first terminal of the third switch K3 and an infrared light L ED lamp D1, a second terminal of the second switch K2 is connected to the externally connected dc power source, a control terminal of the third switch K3 is connected to a first output terminal of the digital-to-analog conversion circuit 3, a second terminal of the third switch K3 is grounded, it should be noted that, in the present embodiment, the first switch K1 and the third switch K3 are PNP type triodes MMBT5551, wherein a base, a collector, a base, a collector, a base, a collector, a.
In a preferred embodiment, as shown in fig. 2, the red driving circuit 2 comprises a fourth switch K4, a fifth switch K5 and a sixth switch K6, wherein a control terminal of the fourth switch K4 is externally connected with a second driving control signal, a first terminal of the fourth switch K4 is respectively connected with a control terminal of the fifth switch K5 and an externally connected dc power source, a second terminal of the fourth switch K4 is grounded, a first terminal of the fifth switch K5 is respectively connected with a first terminal of the sixth switch K6 and the red light L ED lamp D2, a second terminal of the fifth switch K6384 is connected with an externally connected dc power source, a control terminal of the sixth switch K6 is connected with a second output terminal of the digital-to-analog conversion circuit 3, a second terminal of the sixth switch K6 is grounded, it should be noted that, in the present embodiment, the fourth switch K4 and the sixth switch K6 are of the type triode with the MMBT5551, wherein the first terminal of the first switch K, the sixth switch K6 and the fourth switch K are connected with a collector of the same type as the third switch K5, the third switch K595, the third switch K599 and the third switch K5, the third switch K599 is not used for controlling the emitter of the NPN transistor.
In a preferred embodiment, as shown in fig. 2, the infrared light driving circuit 1 further includes: the driving circuit comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a sixth resistor R6, wherein a control end of a first switch K1 is externally connected with a first driving control signal through the first resistor R1; a first end of the first switch K1 is connected with an external direct-current power supply through a second resistor R2, and a first end of the first switch K1 is connected with a control end of a second switch K2 through a third resistor R3; a control terminal of the third switch K3 is connected to the first output terminal of the digital-to-analog conversion circuit 3 through a fourth resistor R4, a control terminal of the third switch K3 is grounded through a fifth resistor R5, and a second terminal of the third switch K3 is grounded through a sixth resistor R6. In practical applications, the first resistor R1 to the sixth resistor R6 can provide functions of overvoltage protection and overcurrent protection.
In a preferred embodiment, as shown in fig. 2, the red driving circuit 2 further includes: a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11 and a twelfth resistor R12, wherein a control end of the fourth switch K4 is externally connected with a second driving control signal through the seventh resistor R7; a first end of the fourth switch K4 is connected with an external direct-current power supply through an eighth resistor R8, and a first end of the fourth switch K4 is connected with a control end of the fifth switch K5 through a ninth resistor R9; a control terminal of the sixth switch K6 is connected to the second output terminal of the digital-to-analog conversion circuit 3 through a tenth resistor R10, a control terminal of the sixth switch K6 is grounded through an eleventh resistor R11, and a second terminal of the sixth switch K6 is grounded through a twelfth resistor R12. In practical applications, the seventh resistor R7 to the twelfth resistor R12 can provide functions of overvoltage protection and overcurrent protection.
In practical applications, the digital-to-analog conversion circuit 3 is implemented by a T L V5618A chip, and controls the driving current of the red light L ED lamp D2 and the infrared light L ED lamp D1 by adjusting the base current of the corresponding connected triode in the pulse wave driving circuit, so as to control the light intensity of the L ED lamp.
In practical application, two I/O control signals generated by a main control chip of the sleep monitor are used as the first drive control signal and the second drive control signal to control the on and off of an infrared L ED lamp D1, a red light L ED and the like, and the main control chip also controls the output of the digital-to-analog conversion circuit 3T L V5618A chip, so that the pulse wave drive circuit in the embodiment of the invention can adjust the magnitude of the drive current according to the instruction of the main control chip, thereby realizing the quantitative control of the drive light intensity of the blood oxygen probe, and enabling the blood oxygen saturation detection result to reach the best.
Through the cooperation in coordination of each above-mentioned component part, the utility model discloses sleep monitor's pulse wave drive circuit has realized the suppression to power noise and drive circuit self internal noise to the realization is to the regulation of infrared light L ED lamp D1 and ruddiness L ED lamp D2 luminance, and then has improved the accuracy of oxyhemoglobin saturation testing result, has the advantage that luminous stability, noise immunity are strong, luminance is adjustable for traditional drive circuit.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.
Claims (9)
1. A pulse wave driving circuit of a sleep monitor, comprising: an infrared light driving circuit (1) and a red light driving circuit (2), wherein,
a first input end of the infrared light drive circuit (1) is externally connected with a first drive control signal, and a second input end of the infrared light drive circuit is connected with a first output end of the digital-to-analog conversion circuit (3);
the output end of the infrared light drive circuit (1) is connected with an infrared light L ED lamp (D1) in the blood oxygen probe;
a first input end of the red light drive circuit (2) is externally connected with a second drive control signal, and a second input end of the red light drive circuit is connected with a second output end of the digital-to-analog conversion circuit (3);
the output end of the red light driving circuit (2) is connected with a red light L ED lamp (D2) in the blood oxygen probe.
2. The pulse wave driving circuit of the sleep monitor according to claim 1, wherein the infrared light driving circuit (1) comprises: a first switch (K1), a second switch (K2), and a third switch (K3), wherein,
the control end of the first switch (K1) is externally connected with the first driving control signal, the first end of the first switch (K1) is respectively connected with the control end of the second switch (K2) and an external direct current power supply, and the second end of the first switch (K1) is grounded;
a first end of the second switch (K2) is respectively connected with a first end of the third switch (K3) and the infrared light L ED lamp (D1), and a second end of the second switch (K2) is connected with the external direct-current power supply;
the control end of the third switch (K3) is connected with the first output end of the digital-to-analog conversion circuit (3), and the second end of the third switch (K3) is grounded.
3. The pulse wave driving circuit of the sleep monitor according to claim 1, wherein the red light driving circuit (2) comprises: a fourth switch (K4), a fifth switch (K5), and a sixth switch (K6), wherein,
a control end of the fourth switch (K4) is externally connected with the second driving control signal, a first end of the fourth switch (K4) is respectively connected with a control end of the fifth switch (K5) and an externally connected direct current power supply, and a second end of the fourth switch (K4) is grounded;
a first end of the fifth switch (K5) is respectively connected with a first end of the sixth switch (K6) and the red light L ED lamp (D2), and a second end of the fifth switch (K5) is connected with the external direct-current power supply;
the control end of the sixth switch (K6) is connected with the second output end of the digital-to-analog conversion circuit (3), and the second end of the sixth switch (K6) is grounded.
4. The pulse wave driving circuit of the sleep monitor according to claim 2, wherein the infrared light driving circuit (1) further comprises: a first resistor (R1), a second resistor (R2), a third resistor (R3), a fourth resistor (R4), a fifth resistor (R5), and a sixth resistor (R6), wherein,
a control terminal of the first switch (K1) is externally connected with the first driving control signal through the first resistor (R1);
a first end of the first switch (K1) is connected with the external direct current power supply and the external direct current power supply through the second resistor (R2), and a first end of the first switch (K1) is connected with a control end of the second switch (K2) through the third resistor (R3);
the control end of the third switch (K3) is connected with the first output end of the digital-to-analog conversion circuit (3) through the fourth resistor (R4), the control end of the third switch (K3) is grounded through the fifth resistor (R5), and the second end of the third switch (K3) is grounded through the sixth resistor (R6).
5. The pulse wave driving circuit of the sleep monitor according to claim 3, wherein the red light driving circuit (2) further comprises: a seventh resistor (R7), an eighth resistor (R8), a ninth resistor (R9), a tenth resistor (R10), an eleventh resistor (R11), and a twelfth resistor (R12), wherein,
a control terminal of the fourth switch (K4) is externally connected with the second driving control signal through the seventh resistor (R7);
a first terminal of the fourth switch (K4) is connected to the external dc power supply through the eighth resistor (R8), and a first terminal of the fourth switch (K4) is connected to a control terminal of the fifth switch (K5) through the ninth resistor (R9);
the control end of the sixth switch (K6) is connected to the second output end of the digital-to-analog conversion circuit (3) through the tenth resistor (R10), the control end of the sixth switch (K6) is grounded through the eleventh resistor (R11), and the second end of the sixth switch (K6) is grounded through the twelfth resistor (R12).
6. The pulse wave driving circuit of the sleep monitor according to claim 2, wherein the first switch (K1) and the third switch (K3) are PNP transistors and the second switch (K2) is an NPN transistor.
7. The pulse wave driving circuit of the sleep monitor according to claim 3, wherein the fourth switch (K4) and the sixth switch (K6) are PNP transistors, and the fifth switch (K5) is NPN transistors.
8. The pulse wave driving circuit of the sleep monitor according to claim 1, wherein the digital-to-analog conversion circuit (3) is a T L V5618A chip.
9. The pulse wave driving circuit of a sleep monitor according to claim 1, wherein the first driving control signal and the second driving control signal are generated by a single chip microcomputer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2019200389944 | 2019-01-09 | ||
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114376538A (en) * | 2020-10-21 | 2022-04-22 | 华为技术有限公司 | Method for periodically measuring blood oxygen and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114376538A (en) * | 2020-10-21 | 2022-04-22 | 华为技术有限公司 | Method for periodically measuring blood oxygen and electronic equipment |
| WO2022083363A1 (en) * | 2020-10-21 | 2022-04-28 | 华为技术有限公司 | Method for periodically measuring blood oxygen, and electronic device |
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