CN112568906B - Detection circuit, wearable device detection method and wearable device - Google Patents
Detection circuit, wearable device detection method and wearable device Download PDFInfo
- Publication number
- CN112568906B CN112568906B CN201910936668.XA CN201910936668A CN112568906B CN 112568906 B CN112568906 B CN 112568906B CN 201910936668 A CN201910936668 A CN 201910936668A CN 112568906 B CN112568906 B CN 112568906B
- Authority
- CN
- China
- Prior art keywords
- electrode
- circuit
- signal output
- node
- detection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/681—Wristwatch-type devices
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Medical Informatics (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Heart & Thoracic Surgery (AREA)
- Physics & Mathematics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Electronic Switches (AREA)
- Measurement And Recording Of Electrical Phenomena And Electrical Characteristics Of The Living Body (AREA)
Abstract
The disclosure relates to a detection circuit, a wearable device detection method and a wearable device, wherein the detection circuit comprises: the device comprises a first power supply, a first electrode, a second power supply, a second electrode, a third electrode, an anti-interference subcircuit and a switching subcircuit, wherein the first power supply is connected to a first node, and the first node is connected with a signal output end; a first electrode connected to the first node; the second power supply is connected to a second node, and the second node is connected with the signal output end; the anti-interference sub-circuit is used for transmitting an anti-interference signal; the switching sub-circuit is respectively connected with a second electrode, a third electrode, a second node and an anti-interference sub-circuit, and is used for enabling the second electrode to be connected with the second node and enabling the third electrode to be connected with the anti-interference sub-circuit in a first mode, and is used for enabling the second electrode to be connected with the anti-interference sub-circuit and enabling the third electrode to be connected with the second node in a second mode.
Description
Technical Field
The disclosure relates to the technical field of wearable equipment, in particular to a detection circuit, a wearable equipment detection method and wearable equipment.
Background
Wearable devices such as smart watches, bracelets, and bracelets often need to detect the wearing state to determine whether the wearable device is being worn. Currently, wearable devices detect the wearing state mainly through capacitive touch sensors. The capacitance of the capacitive sensor is changed by contacting the human body, thereby determining the wearing state. However, in practical applications, the detection of the capacitive sensor is easily disturbed, for example, the contact of a metal conductor or clothing with the capacitive sensor may cause the capacitance of the capacitive sensor to change, which may further result in erroneous detection results.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The disclosure aims to provide a detection circuit, a wearable device detection method and a wearable device, which at least solve the problem of detection errors caused by the fact that detection of a capacitive sensor in the related art is easily interfered to a certain extent.
According to a first aspect of the present disclosure, there is provided a detection circuit for a wearable device, the detection circuit comprising:
the first power supply is connected to the first node, and the first node is connected with the signal output end;
the first electrode is connected to the first node and is used for being in contact with a first part of a human body;
the second power supply is connected to a second node, and the second node is connected with the signal output end;
the second electrode is used for being in contact with a second part of the human body;
the third electrode is used for being connected with a third part of the human body;
the anti-interference sub-circuit is used for transmitting anti-interference signals; and
a switching sub-circuit respectively connected to the second electrode, the third electrode, the second node, and the anti-tamper sub-circuit, the switching sub-circuit being configured to connect the second electrode to the second node and the third electrode to the anti-tamper sub-circuit in a first mode, the switching sub-circuit being configured to connect the second electrode to the anti-tamper sub-circuit and the third electrode to the second node in a second mode;
the first mode is a wearing state detection mode, and the second mode is an electrocardiograph detection mode.
According to a second aspect of the present disclosure, there is provided a wearable device detection method for the detection circuit described above, the method comprising:
acquiring a signal output by a signal output end;
detecting the voltage of the signal output by the signal output end;
when the voltage of the signal output by the signal output end is within a first threshold range, the wearable device is determined to be in a wearing state, and the switching sub-circuit is controlled to switch the detection circuit from a first mode to a second mode.
According to a third aspect of the present disclosure, there is provided a wearable device comprising the detection circuit described above.
The detection circuit provided by the disclosure is characterized in that the sub-circuit is switched so that the second electrode is connected to the second node and the third electrode is connected to the anti-interference sub-circuit in the first mode, and the second electrode is connected to the anti-interference sub-circuit and the third electrode is connected to the second node in the second mode. The wearable device is judged to be in a wearing state according to the voltage of the signal output end when the wearable device is in the first mode, and the wearable device is switched to the second mode when the wearable device is in the wearing state so as to perform electrocardiograph detection; further, the problem that detection errors of the wearable equipment wearing state are caused by the fact that detection through the capacitive sensor is easy to interfere in the related art is solved, and detection accuracy is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic diagram of a first detection circuit provided in an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a second detection circuit provided in an exemplary embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a third detection circuit provided in an exemplary embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a fourth detection circuit provided by an exemplary embodiment of the present disclosure;
FIG. 5 is a schematic diagram of a detection circuit power waveform provided by an exemplary embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a fifth detection circuit provided by an exemplary embodiment of the present disclosure;
FIG. 7 is a schematic diagram of an equivalent detection circuit provided by an exemplary embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a sixth detection circuit provided by an exemplary embodiment of the present disclosure;
fig. 9 is a flowchart of a method for detecting a wearable device according to an exemplary embodiment of the present disclosure;
fig. 10 is a schematic diagram of a wearable device provided in an exemplary embodiment of the present disclosure.
In the figure:
110. a first power supply; 111. a first current source; 112. a first voltage source; 113. a first resistor; 120. a second power supply; 121. a second current source; 122. a second voltage source; 123. a second resistor; 210. a first electrode; 220. a second electrode; 230. a third electrode; 310. a switching sub-circuit; 311. a first switching unit; 312. a second switching unit; 313. a detection controller; 410. an anti-tamper sub-circuit; 411. a first operational amplifier; 510. a signal output terminal; 610. a second operational amplifier; 620. a third operational amplifier; 630. a fourth operational amplifier; d1, a first node; d2, a second node; t1, a first transistor; t2, a second transistor; t3, third transistor; and T4, a fourth transistor.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and thus a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the disclosed aspects may be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, etc. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
The present disclosure first provides a detection circuit for a wearable device, as shown in fig. 1, the detection circuit including: the first power source 110, the first electrode 210, the second power source 120, the second electrode 220, the third electrode 230, the tamper resistant sub-circuit 410, and the switching sub-circuit 310. The first power supply 110 is connected to the first node D1, and the first node D1 is connected to the signal output terminal 510. The first electrode 210 is connected to the first node D1 for contacting a first portion of the human body. The second power source 120 is connected to the second node D2, and the second node D2 is connected to the signal output terminal 510. The second electrode 220 is for contacting a second portion of the human body. The third electrode 230 is for connection to a third part of the human body. The immunity sub-circuit 410 is used to transmit the immunity signal. The switching sub-circuit 310 is respectively connected to the second electrode 220, the third electrode 230, the second node D2 and the anti-interference sub-circuit 410, the switching sub-circuit 310 is configured to connect the second electrode 220 to the second node D2 and the third electrode 230 to the anti-interference sub-circuit 410 in the first mode, and the switching sub-circuit 310 is configured to connect the second electrode 220 to the anti-interference sub-circuit 410 and the third electrode 230 to the second node D2 in the second mode.
The first mode is a wearing state detection mode, and the second mode is an electrocardiograph detection mode. The first part, the second part and the third part of the human body are three parts which are mutually different on the human body. In the initial state, the detection circuit is in the first mode, the second electrode 220 is connected to the second node D2, and the third electrode 230 is connected to the anti-tamper sub-circuit 410. When the wearing state is detected to be worn, the detection circuit enters a second mode, and is conducted into an ECG (electric car-diode) circuit, and the detection circuit detects an electrocardiogram of the human body by contacting three different positions of the human body.
In the first mode, when the wearable device is in the unworn state, an open state is between the first electrode 210 and the second electrode 220. When the wearable device is in a wearing state, the first electrode 210 and the second electrode 220 are turned on by the human body. Therefore, the signal voltage output by the signal output terminal 510 in the wearing state is different from the signal voltage output by the signal output terminal 510 in the non-wearing state, and the wearing state of the wearable device can be determined according to the signal voltage output terminal 510.
The detection circuit provided in the embodiment of the present disclosure is configured such that, by switching the sub-circuit 310, in the first mode, the second electrode 220 is connected to the second node D2 and the third electrode 230 is connected to the anti-interference sub-circuit 410, and in the second mode, the second electrode 220 is connected to the anti-interference sub-circuit 410 and the third electrode 230 is connected to the second node D2. The wearable device is judged to be in a wearing state according to the voltage of the signal output end 510 when the wearable device is in the first mode, and the wearable device is switched to the second mode when the wearable device is in the wearing state so as to perform electrocardiograph detection; further, the problem that detection errors of the wearable equipment wearing state are caused by the fact that detection through the capacitive sensor is easy to interfere in the related art is solved, and detection accuracy is improved.
The following will describe each part of the detection circuit provided in the embodiment of the present disclosure in detail:
as shown in fig. 2, the switching sub-circuit 310 may include: the first switching unit 311, the second switching unit 312, and the detection controller 313. The first end of the first switching unit 311 is connected to the second electrode 220 and the third electrode 230, respectively, and the second end of the first switching unit 311 is connected to the second node D2. The first end of the second switch unit 312 is connected to the second electrode 220 and the third electrode 230, respectively, and the second end of the second switch unit 312 is connected to the anti-interference sub-circuit. The detection controller 313 is respectively connected to the signal output terminal 510, the first switch unit 311 and the second switch unit 312, and the detection controller 313 outputs a control signal to the first switch unit 311 and the second switch unit 312 according to the signal of the signal output terminal 510, and the first switch unit 311 and the second switch unit 312 switch to the first mode or the second mode in response to the control signal.
As shown in fig. 3, the first switch unit 311 includes a first transistor T1 and a second transistor T2, a first terminal of the first transistor T1 is connected to the second electrode 220, a second terminal of the first transistor T1 is connected to the second node D2, and a control terminal of the first transistor T1 is connected to the detection controller 313. The first end of the second transistor T2 is connected to the third electrode 230, the second end of the second transistor T2 is connected to the second node D2, and the control end of the second transistor T2 is connected to the detection controller 313.
The second switch unit 312 includes a third transistor T3 and a fourth transistor T4, where a first end of the third transistor T3 is connected to the second electrode 220, a second end is connected to the anti-interference sub-circuit, and a control end is connected to the detection controller 313; the first end of the fourth transistor T4 is connected to the third electrode 230, the second end is connected to the anti-tamper circuit, and the control end is connected to the detection controller 313;
in the initial state, the detection controller 313 outputs a first control signal to the control terminals of the first transistor T1 and the fourth transistor T4, and the first transistor T1 and the fourth transistor T4 are turned on in response to the first control signal. When the detection controller 313 detects that the voltage of the signal output terminal 510 is within the first threshold range, the detection controller 313 outputs a second control signal to the control terminals of the second transistor T2 and the third transistor T3, and the second transistor T2 and the third transistor T3 are turned on in response to the second control signal.
It should be noted that, the first transistor T1 to the fourth transistor T4 in the embodiment of the disclosure each have a first terminal, a second terminal, and a control terminal. The first terminal of the transistor may be a source, the second terminal may be a drain, and the control terminal may be a gate; or the first terminal of the transistor may be the drain, the second terminal may be the source, and the control terminal may be the gate. Each transistor can be an N-type transistor or a P-type transistor, and when each transistor is an N-type transistor, the first control signal and the second control signal are high-level voltages; when each transistor is a P-type transistor, the first control signal and the second control signal are low level voltages.
Of course, the switch unit in the detection circuit provided in the present disclosure may also include a CMOS (Complementary Metal Oxide Semiconductor ) circuit and the like, and is not limited to the detection circuit provided in the present embodiment, and will not be described here again.
In the initial state, the first electrode 210, the second electrode 220, and the third electrode 230 are insulated from each other, so that the voltage of the signal output terminal 510 is the first voltage. For example, the first voltage is a power supply voltage or the first voltage is a saturation voltage value of the operational amplifier after the power supply signal passes through the operational amplifier. In the first mode, when the wearable device is in the wearing state, the first electrode 210 and the second electrode 220 are conducted through the human body, which is equivalent to that a resistor with a resistance value of several hundred ohms to several hundred thousand ohms is connected between the first electrode 210 and the second electrode 220. At this time, the voltage at the signal output terminal 510 changes, and the voltage may be calculated according to the power supply voltage and other circuit parameters. The first threshold range of the voltage of the signal output terminal 510 at this time is obtained by theoretical calculation and stored in the storage device in the detection controller 313. When the voltage of the signal actually output by the signal output terminal 510 is detected to be within the first threshold range, the wearable device is judged to be in the wearing state.
When the wearable device is in the wearing state, the detection controller 313 outputs a second control signal, and the second transistor T2 and the third transistor T3 are turned on in response to the second control signal. The first electrode 210 is connected to the first node D1, the third electrode 230 is connected to the second node D2, and the second electrode 220 is connected to the anti-tamper sub-circuit 410. The first electrode 210 and the third electrode 230 collect electrocardiographic signals of the human body, and the second electrode 220 transmits anti-interference signals to the human body. When the wearable device is in a wearing state to an unworn state, the second electrode 220 leaves the human body, that is, the anti-interference subcircuit 410 is broken, the current state of the anti-interference subcircuit 410 can be detected by the detection controller 313, when the anti-interference subcircuit 410 has no current, the detection controller 313 controls the detection circuit to switch from the second mode to the first mode, and the detection circuit is initialized.
The detection controller 313 may include a processor and a voltage detection sensor, where the voltage sensor is disposed at the signal output terminal 510 and the voltage sensor is electrically connected to the processor. The voltage sensor detects the voltage of the signal output terminal 510 in real time and transmits the detected voltage to the processor. The processor outputs a corresponding control signal according to the voltage transmitted by the voltage sensor.
As shown in fig. 4, the first power supply 110 includes a first current source 111, and the first current source 111 is connected to the first node D1 for outputting a first current. The second power supply 120 includes a second current source 121, and the second current source 121 is connected to the second node D2 and is configured to output a second current.
For example, when the wearable device is in the unworn state, the first electrode 210 and the second electrode 220 are disconnected. At this time, the first current source 111 and the second current source 121 output currents in accordance with waveforms shown in fig. 5, and alternately switch current source directions. When the first current source 111 is in sink (pull current SK) state, the second current source 121 is in source (sink current SC) state; conversely, when the first current source 111 is in the sink state, the second current source 121 is in the source state. The current value of the current source is fixedly set around a typical value of 10nA, and the switching frequency is set to the first frequency. At this time, since the first electrode 210 and the second electrode 220 are open, the voltage of the signal output terminal 510 is an alternating amplifier positive and negative saturation voltage value. For example, when the power voltage is 3.3V, the signal output terminal 510 outputs a square wave voltage with a first frequency and a magnitude of 3.3V.
When the wearable device is in a wearing state, the first electrode 210 and the second electrode 220 are turned on by a human body, an equivalent circuit diagram of the detection circuit is shown in fig. 7, and a resistance value of the human body equivalent resistance R1 is between several hundred ohms and several hundred thousand ohms. At this time, the first current source 111 and the second current source 121 alternately switch the current source directions according to the waveforms shown in fig. 5. When the first current source 111 is in the sink state, the second current source 121 is in the source state; conversely, when the first current source 111 is in the sink state, the second current source 121 is in the source state. The current value of the current source is fixedly set around a typical value of 10nA, and the switching frequency is set to the first frequency. At this time, since the human body equivalent resistance R1 of the input terminal is between several hundred ohms and several hundred thousand ohms, the voltage of the signal output terminal 510 is an output voltage of about ten millivolts and a micro amplitude alternating. By setting a relatively suitable amplification factor (e.g., 100 times) for the amplifier, an alternating voltage signal having a frequency of about several hundred millivolts to about 1 volt at the first frequency is output at the circuit signal output 510.
It will be appreciated that as shown in fig. 6, the first power supply 110 may also include a first voltage source 112 and a first resistor 113; the first resistor 113 is connected to the first voltage source 112 and the first node D1, respectively. The second power supply 120 may also include a second voltage source 122 and a second resistor 123; the second resistor 123 is connected to the second voltage source 122 and the second node D2, respectively.
An input terminal of the anti-interference sub-circuit 410 is connected to the signal output terminal 510, and an output terminal of the anti-interference sub-circuit 410 is connected to the switching sub-circuit 310. The signal output by the signal output terminal 510 is used as an anti-interference signal, so that the signal source of the circuit can be saved. Of course, in practical applications, the detection circuit may also provide the anti-interference signal through other signal sources, which is not limited in this disclosure.
As shown in fig. 8, the anti-interference sub-circuit 410 may include a first operational amplifier 411, where the first operational amplifier 411 is connected between the switching sub-circuit and the signal output terminal 510, and is used for operational amplifying the signal output by the signal output terminal 510.
Further, the detection circuit may further include a second operational amplifier 610, a third operational amplifier 620, and a fourth operational amplifier 630. The second operational amplifier 610 is connected between the first node D1 and the signal output terminal 510, and is configured to perform operational amplification on the signal collected by the first electrode 210. The third operational amplifier 620 is connected between the second node D2 and the signal output terminal 510, and is configured to amplify the signal collected by the second electrode 220 in the first mode and to operational amplify the signal collected by the third electrode 230 in the second mode. The fourth operational amplifier 630 is connected to the second operational amplifier 610, the third operational amplifier 620 and the signal output terminal 510, and is used for performing operational amplification on signals output by the second operational amplifier 610 and the third operational amplifier 620.
It should be noted that, in the second mode, the first electrode 210 may be an RA (Right-Arm or R) electrode of the ECG circuit, the second electrode 220 may be an RL (Right-Leg or FA) electrode of the ECG circuit, and the third electrode 230 may be an LL (Left-Leg or F) electrode of the ECG circuit. This connection is known medically as a 2-lead, where the nomenclature of RA, LL and RL is related to medical terminology and not described in detail herein, considering that only these 3 signals come from 3 different physical locations on the biological surface. For example, when the wearable device is a wristwatch, the first electrode 210 and the second electrode 220 are in contact with two positions of a wrist wearing the wristwatch, and the third electrode 230 is connected to the human body by contact with the other hand of the user.
The detection circuit provided in the embodiment of the present disclosure is configured such that, by switching the sub-circuit 310, in the first mode, the second electrode 220 is connected to the second node D2 and the third electrode 230 is connected to the anti-interference sub-circuit 410, and in the second mode, the second electrode 220 is connected to the anti-interference sub-circuit 410 and the third electrode 230 is connected to the second node D2. The wearable device is judged to be in a wearing state according to the voltage of the signal output end 510 when the wearable device is in the first mode, and the wearable device is switched to the second mode when the wearable device is in the wearing state so as to perform electrocardiograph detection; further, the problem that detection errors of the wearable equipment wearing state are caused by the fact that detection through the capacitive sensor is easy to interfere in the related art is solved, and detection accuracy is improved. And the detection circuit has simple structure and low energy consumption, and is beneficial to improving the endurance time of the wearable equipment.
The exemplary embodiment of the disclosure further provides a wearable device detection method, which is used for the detection circuit, as shown in fig. 9, and the method includes the following steps:
step S910, obtaining a signal output by a signal output end;
step S920, detecting the voltage of the signal output by the signal output terminal;
in step S930, when the voltage of the signal output by the signal output end is within the first threshold range, the wearable device is determined to be in a wearing state, and the switching sub-circuit is controlled to switch the detection circuit from the first mode to the second mode.
The wearable device provided in the embodiment of the present disclosure detects the voltage of the signal output by the signal output end 510 by acquiring the signal output by the signal output end 510, determines that the wearable device is in a wearing state when the voltage of the signal output by the signal output end 510 is within the first threshold range, and controls the switching sub-circuit 310 to switch the detection circuit from the first mode to the second mode. The wearable device is judged to be in a wearing state according to the voltage of the signal output end 510 when the wearable device is in the first mode, and the wearable device is switched to the second mode when the wearable device is in the wearing state so as to perform electrocardiograph detection; further, the problem that detection errors of the wearable equipment wearing state are caused by the fact that detection through the capacitive sensor is easy to interfere in the related art is solved, and detection accuracy is improved.
In step S910, the signal output by the signal output terminal 510 may be acquired.
In the initial state, the detection circuit is in the first mode, the second electrode 220 is connected to the second node D2, and the third electrode 230 is connected to the tamper resistant sub-circuit 410. At this time, signals of the first electrode 210 and the second electrode 220 are supplied to the signal output terminal 510.
In step S920, the voltage of the signal output from the signal output terminal 510 may be detected.
The voltage of the signal output by the signal output terminal 510 can be detected in real time by the switching sub-circuit 310. The detection controller 313 in the switching sub-circuit 310 may include a voltage sensor and a processor, detect the voltage of the signal output terminal 510 in real time through the voltage sensor, and transmit the detection result to the processor.
In step S930, when the voltage of the signal output by the signal output terminal 510 is within the first threshold range, the wearable device is determined to be in a wearing state, and the switching sub-circuit 310 is controlled to switch the detection circuit from the first mode to the second mode.
When the detection circuit is in the first mode and the first electrode 210 and the second electrode 220 are in contact with the human body to be turned on, the voltage of the signal output terminal 510 is in the first threshold range; when the first electrode 210 and the second electrode 220 are disconnected, the voltage of the signal output terminal 510 is outside the first threshold range. When it is detected that the voltage of the signal output by the signal output terminal 510 is within the first threshold range, the wearable device is determined to be in a wearing state. At this time, the detection circuit is switched to an electrocardiographic detection mode by the switching circuit.
When the wearable device is changed from the wearing state to the non-wearing state, that is, the wearable device is taken off, the anti-interference sub-circuit 410 is turned off, and the control detection circuit returns to the initial state, that is, is switched to the first mode by the switching circuit.
It should be noted that although the steps of the methods of the present disclosure are illustrated in the accompanying drawings in a particular order, this does not require or imply that the steps must be performed in that particular order or that all of the illustrated steps be performed in order to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step to perform, and/or one step decomposed into multiple steps to perform, etc.
The exemplary embodiments of the present disclosure also provide a wearable device including the detection circuit described above.
The wearable device provided by the implementation of the present disclosure may be a watch, a bracelet, a wristband, or the like. On this basis, as shown in fig. 10, the wearable device may further include a watch body 240, the first electrode 210 and the second electrode 220 are disposed on the inner side of the watch body 240, the inner side of the watch body 240 is a side close to a human body when worn, and the third electrode 230 is disposed on the side of the watch body 240.
When the wearable device is in a wearing state, the first electrode 210 and the second electrode 220 are in contact with the wrist of a user, the third electrode 230 is positioned at the side part of the watch body 240, and when the electrocardiosignals of the user are acquired, the other parts of the user are in contact with the third electrode 230, so that the electrocardiograph acquisition is realized. For example, the wristwatch may be carried on the left wrist of the user, with the first and second electrodes 210, 220 in contact with the left wrist of the user. During electrocardiograph signal acquisition, the third electrode 230 can be touched by a right hand, so that an electrocardiograph acquisition loop is formed.
The wearable device provided in the embodiments of the present disclosure switches the sub-circuit 310 such that, in the first mode, the second electrode 220 is connected to the second node D2 and the third electrode 230 is connected to the anti-interference sub-circuit 410, and in the second mode, the second electrode 220 is connected to the anti-interference sub-circuit 410 and the third electrode 230 is connected to the second node D2. The wearable device is judged to be in a wearing state according to the voltage of the signal output end 510 when the wearable device is in the first mode, and the wearable device is switched to the second mode when the wearable device is in the wearing state so as to perform electrocardiograph detection; further, the problem that detection errors of the wearable equipment wearing state are caused by the fact that detection through the capacitive sensor is easy to interfere in the related art is solved, and detection accuracy is improved.
Those skilled in the art will appreciate that the various aspects of the present disclosure may be implemented as a system, method, or program product. Accordingly, aspects of the invention may be embodied in the following forms, namely: an entirely hardware embodiment, an entirely software embodiment (including firmware, micro-code, etc.) or an embodiment combining hardware and software aspects may be referred to herein as a "circuit," module "or" system.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (13)
1. A detection circuit for a wearable device, the detection circuit comprising:
the first power supply is connected to the first node, and the first node is connected with the signal output end;
the first electrode is connected to the first node and is used for being in contact with a first part of a human body;
the second power supply is connected to a second node, and the second node is connected with the signal output end;
the second electrode is used for being in contact with a second part of the human body;
the third electrode is used for being connected with a third part of the human body;
the anti-interference sub-circuit is used for transmitting anti-interference signals; and
a switching sub-circuit respectively connected to the second electrode, the third electrode, the second node, and the anti-tamper sub-circuit, the switching sub-circuit being configured to connect the second electrode to the second node and the third electrode to the anti-tamper sub-circuit in a first mode, the switching sub-circuit being configured to connect the second electrode to the anti-tamper sub-circuit and the third electrode to the second node in a second mode;
the wearable device comprises a wearable device, a detection controller, a detection circuit and a detection circuit, wherein the first mode is a wearing state detection mode, the second mode is an electrocardiograph detection mode, when the wearable device is in a non-wearing state from a wearing state, the second electrode leaves a human body, the anti-interference subcircuit is broken, and when the detection controller detects that the anti-interference subcircuit has no current, the detection controller controls the detection circuit to be switched from the second mode to the first mode, so that the initialization of the detection circuit is realized.
2. The detection circuit of claim 1, wherein the switching sub-circuit comprises:
the first end of the first switch unit is connected with the second electrode and the third electrode respectively, and the second end of the first switch unit is connected with the second node;
and the first end of the second switch unit is connected with the second electrode and the third electrode respectively, and the second end of the second switch unit is connected with the anti-interference sub-circuit.
3. The detection circuit of claim 2, wherein the switching sub-circuit further comprises:
the detection controller is respectively connected with the signal output end, the first switch unit and the second switch unit, and outputs control signals to the first switch unit and the second switch unit according to signals of the signal output end, and the first switch unit and the second switch unit respond to the control signals and switch to the first mode or the second mode.
4. The detection circuit of claim 3, wherein the first switching unit comprises:
the first end of the first transistor is connected with the second electrode, the second end of the first transistor is connected with the second node, and the control end of the first transistor is connected with the detection controller;
the first end of the second transistor is connected with the third electrode, the second end of the second transistor is connected with the second node, and the control end of the second transistor is connected with the detection controller;
and when the detection controller detects that the voltage of the signal output end is within a first threshold range, the detection controller outputs a second control signal to a second transistor control end, and the second transistor is turned on in response to the second control signal.
5. A detection circuit according to claim 3, wherein the second switching unit comprises:
the first end of the third transistor is connected with the second electrode, the second end of the third transistor is connected with the anti-interference sub-circuit, and the control end of the third transistor is connected with the detection controller;
the first end of the fourth transistor is connected with the third electrode, the second end of the fourth transistor is connected with the anti-interference sub-circuit, and the control end of the fourth transistor is connected with the detection controller;
and when the detection controller detects that the voltage of the signal output end is within a first threshold range, the detection controller outputs a second control signal to a third transistor control end, and the third transistor is turned on in response to the second control signal.
6. The detection circuit of claim 1, wherein the first power supply comprises:
the first current source is connected to the first node and is used for outputting a first current;
the second current source includes:
and the second current source is connected to the second node and is used for outputting a second current.
7. The detection circuit of claim 1, wherein the first power supply comprises:
a first voltage source;
the first resistor is respectively connected with the first voltage source and the first node;
the second power supply includes:
a second voltage source;
and the second resistor is respectively connected with the second voltage source and the second node.
8. The detection circuit of claim 1, wherein an input of the tamper resistant sub-circuit is connected to the signal output, and an output of the tamper resistant sub-circuit is connected to the switching sub-circuit.
9. The detection circuit of claim 8, wherein the tamper resistant subcircuit comprises:
and the first operational amplifier is connected between the switching sub-circuit and the signal output end and is used for operational amplification of signals output by the signal output end.
10. The detection circuit of claim 1, wherein the detection circuit further comprises:
the second operational amplifier is connected between the first node and the signal output end and is used for carrying out operational amplification on the signals acquired by the first electrode;
the third operational amplifier is connected between the second node and the signal output end and is used for amplifying the signal collected by the second electrode in the first mode and amplifying the signal collected by the third electrode in the second mode;
and the fourth operational amplifier is respectively connected with the second operational amplifier, the third operational amplifier and the signal output end and is used for carrying out operational amplification on signals output by the second operational amplifier and the third operational amplifier.
11. A method of wearable device detection for the detection circuit of any of claims 1-9, the method comprising:
acquiring a signal output by a signal output end;
detecting the voltage of the signal output by the signal output end;
when the voltage of the signal output by the signal output end is within a first threshold range, the wearable device is determined to be in a wearing state, and the switching sub-circuit is controlled to switch the detection circuit from a first mode to a second mode.
12. A wearable device comprising the detection circuit of any of claims 1-9.
13. The wearable device of claim 12, wherein the wearable device further comprises:
the watch body, first electrode and second electrode locate the inboard of watch body, the watch body inboard is the one side that is close to the human body when wearing, the third electrode is located the lateral part of watch body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910936668.XA CN112568906B (en) | 2019-09-29 | 2019-09-29 | Detection circuit, wearable device detection method and wearable device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910936668.XA CN112568906B (en) | 2019-09-29 | 2019-09-29 | Detection circuit, wearable device detection method and wearable device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112568906A CN112568906A (en) | 2021-03-30 |
| CN112568906B true CN112568906B (en) | 2023-05-12 |
Family
ID=75110839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910936668.XA Active CN112568906B (en) | 2019-09-29 | 2019-09-29 | Detection circuit, wearable device detection method and wearable device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112568906B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2756117B1 (en) * | 1996-11-18 | 1998-12-24 | Schneider Electric Sa | PROXIMITY DETECTOR WITH STABLE CURRENT SOURCE |
| US7245961B2 (en) * | 2004-07-19 | 2007-07-17 | Hewlett-Packard Development Company, L.P. | ECG electrode characterization and compensation |
| CN102488511A (en) * | 2011-10-28 | 2012-06-13 | 中国人民解放军第四军医大学 | 3G (The 3rd Generation Telecommunication) electro-cardio monitoring system |
| CN203914906U (en) * | 2014-05-21 | 2014-11-05 | 青岛歌尔声学科技有限公司 | A kind of electrocardio testing circuit and electronic equipment |
| CN208659363U (en) * | 2017-12-15 | 2019-03-29 | 歌尔科技有限公司 | A kind of electrode multiplex circuit and wearable device |
| CN108051861B (en) * | 2018-01-10 | 2024-01-30 | 歌尔科技有限公司 | Wear detection circuitry and intelligent wearing equipment |
| CN109889169A (en) * | 2019-03-21 | 2019-06-14 | 达铭实业（宿州）股份有限公司 | A kind of electrocardiogram acquisition circuit with anti-interference function |
-
2019
- 2019-09-29 CN CN201910936668.XA patent/CN112568906B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN112568906A (en) | 2021-03-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| AU2014380313B2 (en) | Wearing dependent operation of wearable device | |
| US10003334B2 (en) | Capacitative sensor system | |
| JP4683148B2 (en) | Electrical equipment | |
| CN1853155B (en) | Electric field object detection system and method for providing output from the receiving electrode of the system | |
| US10980479B2 (en) | Control method of wearable device execution module and wearable device | |
| US20170373686A1 (en) | Capacitive sensor | |
| WO2006124481A3 (en) | Implantable medical device with mri and gradient field induced capture detection methods | |
| CN107865653B (en) | Electrode multiplexing circuit for improving body fat rate measurement accuracy and wearable equipment | |
| TW200518716A (en) | Baby dress and mattress with baby measure sensor, and body measuring method | |
| JP2010204724A (en) | Input system and electric equipment | |
| KR101912870B1 (en) | A non-contact electrocardiography monitoring circuit and a method for non-contact electrocardiography monitoring and an appratus for electrocardiography monitoring | |
| CN112568906B (en) | Detection circuit, wearable device detection method and wearable device | |
| KR101998066B1 (en) | Signal processing device without mechanical switch for on/off operation | |
| CN116712322B (en) | Multi-point polling sampling meridian detection device | |
| JP2011156194A (en) | Electrocardiographic device | |
| US20220346718A1 (en) | Biological information measuring device | |
| CN215503051U (en) | Driver hands-off and health detection device, steering wheel and protective sleeve | |
| TW201239711A (en) | Circuit for determining positions of touch points on capacitive position detecting panel, touch panel module and method for detecting touch points on capacitive type touch panel | |
| US11446494B2 (en) | Skin care device and control method therefor | |
| CN112450940A (en) | Electrocardio detection device, chip, method and wearable electronic equipment | |
| CN112305320A (en) | Proximity detection circuit, wearable device and proximity detection method | |
| JP2012084453A (en) | Capacitance switch | |
| JPH10179531A (en) | Detecting circuit for detached electrode | |
| EP4059410A1 (en) | Arrangement and method for measuring an electrical property of a body | |
| JP2018510022A (en) | Measurement signal amplifier and energy supply method for measurement signal amplifier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |