CN117269842B - Electrode drop detection circuit and equipment - Google Patents
Electrode drop detection circuit and equipment Download PDFInfo
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- CN117269842B CN117269842B CN202311543499.6A CN202311543499A CN117269842B CN 117269842 B CN117269842 B CN 117269842B CN 202311543499 A CN202311543499 A CN 202311543499A CN 117269842 B CN117269842 B CN 117269842B
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- 238000001514 detection method Methods 0.000 title claims abstract description 134
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims abstract description 9
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
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Abstract
The application discloses an electrode falling detection circuit and equipment, wherein the circuit comprises a signal generation unit, a processing unit and a detection unit, and the signal generation unit and the processing unit are respectively connected with the detection unit; when the input voltage is connected to the signal generating unit, the signal generating unit generates electrode voltage corresponding to the electrode voltage acquisition point and transmits the electrode voltage to the detecting unit; the processing unit generates a voltage signal corresponding to the input voltage and transmits the voltage signal to the detection unit; when the voltage signal meets a preset condition, the detection unit outputs a first falling detection result of the electrode based on the electrode voltage, so that the electrode falling is detected.
Description
Technical Field
The application relates to the technical field of circuits, in particular to an electrode falling detection circuit and device.
Background
In the electrical stimulation treatment, two electrodes of a therapeutic apparatus are usually required to be contacted with the skin surface of a patient, and then a switch of the therapeutic apparatus is turned on, so that a current path is formed between the two electrodes and the body of the patient, thereby electrically stimulating the patient.
However, since there is a possibility that the two electrodes fall off during the electrical stimulation, which affects the therapeutic effect of the electrical stimulation, a technical solution is needed to detect the falling off of the electrodes.
Disclosure of Invention
The application discloses an electrode falling detection circuit and equipment, which are used for detecting electrode falling.
In a first aspect, an embodiment of the present application provides an electrode falling detection circuit, including a signal generating unit, a processing unit, and a detection unit, where the signal generating unit and the processing unit are respectively connected to the detection unit;
When the input voltage is connected to the signal generating unit, the signal generating unit generates electrode voltage corresponding to an electrode voltage acquisition point and transmits the electrode voltage to the detecting unit; the processing unit generates a voltage signal corresponding to the input voltage and transmits the voltage signal to the detection unit;
And the detection unit outputs a first falling detection result of the electrode based on the electrode voltage when the voltage signal meets a preset condition.
In a possible embodiment, the input voltage is generated by a power supply unit, which is connected to the processing unit, which is connected to the signal generating unit;
Wherein, when the electrode falls off, the electrode voltage is at a low level; when the electrode voltage is at a low level, the processing unit controls the power supply unit to disconnect the input voltage; when the electrode voltage is at a high level, the processing unit controls the power supply unit to output the input voltage.
In one possible embodiment, the signal generating unit includes a first switching tube, a second switching tube, a third switching tube, and a fourth switching tube;
The first switching tube, the second switching tube, the third switching tube and the fourth switching tube are connected in an annular mode, and the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the processing unit;
an access point of the input voltage is arranged between the first switching tube and the second switching tube connecting line, and a grounding point is arranged between the third switching tube and the fourth switching tube connecting line;
When the first switching tube is controlled to be conducted by the processing unit through a first control signal, the second switching tube is controlled to be closed through a second control signal, the third switching tube is controlled to be closed through a third control signal, and the fourth switching tube is controlled to be conducted through a fourth control signal; when the processing unit controls the first switching tube to be closed through a first control signal, the second switching tube is controlled to be conducted through a second control signal, the third switching tube is controlled to be conducted through a third control signal, and the fourth switching tube is controlled to be closed through a fourth control signal.
In a possible embodiment, any of the above circuits further comprises a first protection unit;
The first pin of the first protection unit is connected with the access end of the second control signal corresponding to the second switch tube, the second pin of the first protection unit is connected with the processing unit, and the third pin of the first protection unit is grounded;
The processing unit controls on or off between the first pin of the first protection unit and the third pin of the first protection unit by inputting a fifth control signal to the second pin of the first protection unit, and the processing unit comprises:
When the electrode voltage is a low-level signal, the fifth control signal is a high-level signal, and the first pin of the first protection unit is conducted with the third pin of the first protection unit; when the electrode voltage is a high-level signal, the fifth control signal is a low-level signal, and the first pin of the first protection unit and the third pin of the first protection unit are closed.
In one possible embodiment, any one of the above circuit further includes a second protection unit, where the second protection unit includes a first resistor, a second resistor, a third resistor, a fifth switch tube, and a first capacitor;
The first end of the first resistor is connected with the first pin of the first switching tube, and the second end of the first resistor is connected with the second pin of the first switching tube and the first end of the second resistor;
The second end of the second resistor is connected with the first pin of the fifth switching tube;
The second pin of the fifth switching tube is connected with the first end of the third resistor and the first end of the first capacitor, and the third pin of the fifth switching tube and the second end of the first capacitor are grounded;
the second end of the third resistor is connected with the processing unit to receive the first control signal transmitted by the processing unit.
In one possible embodiment, any one of the above circuits further includes a third protection unit, where the third protection unit includes a fourth resistor, a fifth resistor, a sixth switching tube, and a second capacitor;
The first end of the fourth resistor is connected with the first pin of the third switching tube, and the second end of the fourth resistor is connected with the second pin of the third switching tube and the first end of the fifth resistor;
the second end of the fifth resistor is connected with the first pin of the sixth switching tube;
The second pin of the sixth switching tube is connected with the first end of the sixth resistor and the first end of the second capacitor, and the third pin of the sixth switching tube and the second end of the second capacitor are grounded;
the second end of the sixth resistor is connected with the processing unit to receive the third control signal transmitted by the processing unit.
In a possible embodiment, any of the above circuits further comprises a security recovery unit, said security recovery unit being connected to said signal generation unit;
when the electrode voltage is at a high level, the electrode current flowing through the electrode corresponds to the set voltage accessed by the safety recovery unit, and the method comprises the following steps:
When the set voltage increases, the electrode current increases;
as the set voltage decreases, the electrode current decreases.
In one possible embodiment, the safety recovery unit includes an amplifier, a seventh switching tube, a seventh resistor;
the first pin of the seventh switching tube is connected with the signal generating unit, the second pin of the seventh switching tube is connected with the output end of the amplifier, and the third pin of the seventh switching tube is connected with the first end of the seventh resistor and the negative input end of the amplifier;
the second end of the seventh resistor is grounded;
and the positive input end of the amplifier is connected to the set voltage.
In a possible embodiment, the detection unit comprises at least 3 pins; a first pin of the at least 3 pins is connected with the signal generating unit, a second pin of the at least 3 pins is connected with the processing unit, and a third pin of the at least 3 pins is used for outputting a falling detection result of the electrode;
And when the voltage signal received by the second pin of the at least 3 pins is smaller than the reference voltage, a path is formed between the third pin of the at least 3 pins and the first pin of the at least 3 pins.
In a possible embodiment, the detection unit includes a comparator and an eighth switching tube, and the comparator is connected to the eighth switching tube;
the first end of the comparator is connected with a reference voltage, the second end of the comparator is connected with the processing unit, and the third end of the comparator is connected with the first pin of the eighth switching tube;
the second pin of the eighth switching tube is connected with the signal generating unit, and the third pin of the eighth switching tube is used for outputting a first falling detection result of the electrode;
And when the reference voltage is larger than the voltage signal, the third end of the comparator outputs a sixth control signal to control the conduction between the second pin of the eighth switching tube and the third pin of the eighth switching tube.
In a possible embodiment, the detection unit includes an optocoupler and an eighth resistor;
The first end of the optical coupler is connected with a reference voltage through the eighth resistor, the second end of the optical coupler is connected with the processing unit, the third end of the optical coupler is connected with the signal generating unit, and the fourth end of the optical coupler outputs a first falling-off detection result of the electrode;
and when the reference voltage is larger than the voltage signal, the third end of the optocoupler is conducted with the fourth end of the optocoupler.
In a possible embodiment, any of the above circuits further includes a fourth protection unit, the fourth protection unit including a ninth resistor, a tenth resistor, and a diode;
The first end of the ninth resistor is connected with the output end of the detection unit, the second end of the ninth resistor is connected with the first end of the tenth resistor, and the second end of the tenth resistor is grounded;
The anode of the diode is connected with the second end of the tenth resistor, and the cathode of the diode is connected with the first end of the tenth resistor;
the first end of the ninth resistor is used for receiving a first falling-off detection result of the electrode, and the second end of the ninth resistor is used for outputting a second falling-off detection result of the electrode.
In a first aspect, an embodiment of the present application provides an electrode falling-off detection apparatus, including a circuit as described in any one of the above.
The electrode falling detection circuit and the device provided by the embodiment of the application can realize the following technical effects:
according to the electrode falling detection circuit and the electrode falling detection device, when falling detection is carried out on the electrode, the input voltage is converted into the corresponding voltage signal, and the voltage signal is used as the trigger signal for triggering the detection unit to output the falling detection result. In addition, when the voltage signal meets the preset condition, the falling detection result of the electrode is output based on the electrode voltage, and the electrode voltage is prevented from being directly detected, so that the damage to detection equipment is prevented when the electrode voltage is too high.
Drawings
Fig. 1 is a schematic structural diagram of an electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 3 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 4 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 5 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 7 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 8 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 10 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 11 is a schematic structural diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 12 is an exemplary diagram of another electrode falling-off detection circuit according to an embodiment of the present application.
Fig. 13 is a schematic diagram of a control signal according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings. Specific circuits in the circuit embodiments may also be applied in the device embodiments. In the description of the present application, "a plurality of" means "at least two". "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. A is connected with B, and can be represented as follows: both cases of direct connection of A and B and connection of A and B through C. In addition, in the description of the present application, the words "first," "second," and the like are used merely for distinguishing between the descriptions and not be construed as indicating or implying a relative importance or order.
It is noted that in the following description, specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than those herein described, and those skilled in the art may readily devise numerous other arrangements that do not depart from the spirit of the application. Therefore, the present application is not limited by the specific embodiments disclosed below. The description hereinafter sets forth a preferred embodiment for practicing the application, but is not intended to limit the scope of the application, as the description is given for the purpose of illustrating the general principles of the application. The scope of the application is defined by the appended claims.
Embodiments of the present application will be described in detail below with reference to the accompanying drawings.
In the electrical stimulation treatment, it is generally necessary to contact two electrodes of the therapeutic apparatus on the surface of the skin of the patient, and then turn on a switch of the therapeutic apparatus so that a current path is formed between the two electrodes and the body of the patient to achieve electrical stimulation of the patient. However, since there is a possibility that the two electrodes fall off during the electrical stimulation, which affects the therapeutic effect of the electrical stimulation, a technical solution is needed to detect the falling off of the electrodes.
In order to solve the above problems, the present application provides an electrode falling detection circuit, which includes a signal generating unit, a processing unit and a detection unit, wherein the signal generating unit and the processing unit are respectively connected with the detection unit; when the input voltage is connected to the signal generating unit, the signal generating unit generates electrode voltage corresponding to the electrode voltage acquisition point and transmits the electrode voltage to the detecting unit; the processing unit generates a voltage signal corresponding to the input voltage and transmits the voltage signal to the detection unit; the detection unit outputs a first falling detection result of the electrode based on the electrode voltage when the voltage signal meets a preset condition. Through the circuit, when the electrode is subjected to falling detection, the input voltage is converted into the corresponding voltage signal, and the voltage signal is used as the trigger signal for triggering the detection unit to output the falling detection result. In addition, when the voltage signal meets the preset condition, the falling detection result of the electrode is output based on the electrode voltage, and the electrode voltage is prevented from being directly detected, so that the damage to detection equipment is prevented when the electrode voltage is too high.
As shown in fig. 1, a schematic structural diagram of an electrode falling detection circuit according to an embodiment of the present application includes a signal generating unit 11, a processing unit 12, and a detection unit 13, where the signal generating unit 11 and the processing unit 12 are respectively connected to the detection unit 13. The signal generating unit is provided with two electrode contacts, the two electrode contacts are respectively connected with two electrodes of the therapeutic apparatus, of course, the number of the electrode contacts can be more than two, and the specific number of the electrode contacts is determined according to the number of the electrodes of the therapeutic apparatus.
When the input voltage is connected to the signal generating unit 11, the signal generating unit 11 generates an electrode voltage corresponding to the electrode voltage acquisition point, and transmits the electrode voltage to the detecting unit 13. It is easy to understand that when the input voltage is connected to the signal generating unit 11, if no electrode is dropped out of the two electrodes of the therapeutic apparatus, a current path is formed between the two electrodes through the body, and at this time, the current between the two electrodes electrically stimulates the body to realize the therapeutic effect; if there is electrode drop out in the two electrodes of the therapeutic apparatus, no current path is formed between the two electrodes, and at this time, electrode drop out detection is required. Since the current path between the two electrodes is disconnected when the electrodes fall off, which affects the electrode voltage, in the embodiment of the present application, when the electrode fall off is detected, the electrode voltage of the target electrode needs to be collected, and the collected electrode voltage is transmitted to the detection unit 13, where the electrode contact of the target electrode is an electrode voltage collection point.
When the input voltage is connected to the signal generating unit 11, the processing unit 12 generates a voltage signal corresponding to the input voltage, and transmits the voltage signal to the detecting unit 13. Wherein the voltage signal may be a digital signal, the process of the processing unit 12 generating the corresponding voltage signal from the input voltage may be understood as analog-to-digital (a/D) conversion; the voltage signal may also be other signals within a preset range, and the process of the processing unit 12 generating the corresponding voltage signal from the input voltage may be understood as mapping. Since the input voltage is relatively high in practical application, there may be a safety hazard in the direct input detection unit 13, so that the input voltage is mapped into a voltage signal in a preset range, so as to facilitate the subsequent electrode detachment detection.
The detecting unit 13, after receiving the voltage signal transmitted by the processing unit 12, outputs a first drop detection result of the electrode based on the electrode voltage when the voltage signal meets a preset condition, specifically includes: when the voltage signal is at a low level, judging whether the electrode voltage is continuously kept at the low level within a preset time, if so, confirming that the electrode is dropped, otherwise, confirming that the electrode is not dropped; or when the voltage signal is in a preset range, judging whether the electrode voltage is continuously maintained at a low level in a preset time, if so, confirming that the electrode is dropped, otherwise, confirming that the electrode is not dropped.
Based on the circuit, when the electrode is subjected to falling detection, the input voltage is converted into a corresponding voltage signal, and the voltage signal is used as a trigger signal for triggering the detection unit to output a falling detection result. In addition, when the voltage signal meets the preset condition, the falling detection result of the electrode is output based on the electrode voltage, and the electrode voltage is prevented from being directly detected, so that the damage to detection equipment is prevented when the electrode voltage is too high.
In one possible embodiment, as shown in fig. 2, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 2, the input voltage is generated by a power supply unit 21, the power supply unit 21 is connected to a processing unit 12, and the processing unit 12 is connected to a signal generating unit 11; when the electrode falls off, the electrode voltage is low; when the electrode voltage is at a low level, the processing unit 12 controls the power supply unit 21 to turn off the input voltage; when the electrode voltage is at a high level, the processing unit 12 controls the power supply unit 21 to output an input voltage. Here, if the electrode voltage received by the processing unit 12 is at a low level, it is indicated that there is electrode falling, and the input voltage is disconnected at this time, so that the power supply unit 21 still supplies power when the electrode falls, and the power use safety is ensured.
In one possible embodiment, as shown in fig. 3, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 3, the signal generating unit 11 includes a first switching tube 31, a second switching tube 32, a third switching tube 33, and a fourth switching tube 34; the first switching tube 31, the second switching tube 32, the third switching tube 33 and the fourth switching tube 34 are connected in an annular manner, and the first switching tube 31, the second switching tube 32, the third switching tube 33 and the fourth switching tube 34 are respectively connected with the processing unit 12; an access point for input voltage is arranged between the connection lines of the first switching tube 31 and the second switching tube 32, and a grounding point G is arranged between the connection lines of the third switching tube 33 and the fourth switching tube 34.
When the processing unit 12 controls the first switching tube 31 to be turned on through the first control signal, controls the second switching tube 32 to be turned off through the second control signal, controls the third switching tube 33 to be turned off through the third control signal, and controls the fourth switching tube 34 to be turned on through the fourth control signal; when the processing unit 12 controls the first switching tube 31 to be turned off through the first control signal, controls the second switching tube 32 to be turned on through the second control signal, controls the third switching tube 33 to be turned on through the third control signal, and controls the fourth switching tube 34 to be turned off through the fourth control signal.
That is, the first pin of the first switching tube 31 is an input voltage access point, the second pin of the first switching tube 31 is a first control signal access point, and the third pin of the first switching tube 31 is connected to the first pin of the second switching tube 32; a second pin of the second switching tube 32 is connected with a second control signal, and a third pin of the second switching tube 32 is connected with a ground point G; the first pin of the third switching tube 33 is an input voltage access point, the second pin of the third switching tube 33 is connected with a third control signal, and the third pin of the third switching tube 33 is connected with the first pin of the fourth switching tube 34; the second pin of the fourth switching tube 34 is connected to a fourth control signal, and the third pin of the fourth switching tube 34 is connected to the ground point G.
Optionally, in the circuit shown in fig. 3, when the first control signal is at a low level, the second control signal is at a low level, the third control signal is at a high level, and the fourth control signal is at a low level; when the first control signal is at a high level, the second control signal is at a high level, the third control signal is at a high level, and the fourth control signal is at a high level. In both cases, if there is no electrode falling, a path is formed between the two electrodes and the body, and the electrode voltage is not at a low level; when the electrode falls off, an open circuit is formed between the two electrodes, and at this time, if the first control signal goes low, the electrode voltage is low. Therefore, when the electrode voltage is at a low level, the electrode can be considered to be detached.
Based on the circuit, the signal generating unit is provided with a plurality of control signal interfaces, so that the signal generating unit can be controlled conveniently.
In fig. 3, points N and P in the signal generation unit 11 are electrode access points, where point N is an electrode voltage acquisition point. When the first control signal is at a low level, the first switching tube 31 and the fourth switching tube 34 are turned on, the second switching tube 32 and the third switching tube 33 are turned off, and if no electrode is dropped, the input voltage forms a ground path through the first switching tube 31, the N point, the P point and the fourth switching tube 34; when the first control signal is at a high level, the first switching tube 31 and the fourth switching tube 34 are closed, the second switching tube 32 and the third switching tube 33 are conducted, and if no electrode is dropped, the input voltage forms a ground path through the third switching tube 33, the point P, the point N and the second switching tube 32. When a passage is formed between the N point and the P point, the current passing through the N point, namely the electrode current, can generate electric stimulation on the body, so that the treatment effect is realized.
In one possible embodiment, as shown in fig. 4, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 4, the circuit further comprises a first protection unit 41; the first pin of the first protection unit 41 is connected with the access end of the second control signal corresponding to the second switch tube 32, the second pin of the first protection unit 41 is connected with the processing unit 12, and the third pin of the first protection unit 41 is grounded; the processing unit 12 controls on or off between the first pin of the first protection unit 41 and the third pin of the first protection unit 41 by inputting a fifth control signal to the second pin of the first protection unit 41, including: when the electrode voltage is a low level signal, the fifth control signal is a high level signal, and the first pin of the first protection unit 41 is conducted with the third pin of the first protection unit 41, and at this time, the second switching tube 32 is turned off; when the electrode voltage is a high level signal, the fifth control signal is a low level signal, and the first pin of the first protection unit 41 and the third pin of the first protection unit 41 are turned off.
Optionally, the first protection unit 41 is an N-channel enhancement MOS transistor, a first pin of the N-channel enhancement MOS transistor is a drain, a second pin of the N-channel enhancement MOS transistor is a source, and a third pin of the N-channel enhancement MOS transistor is a gate.
Based on the circuit, the electrode voltage is low level to indicate electrode falling, at this time, if the second switching tube is turned on, the electrode voltage becomes high level, and the accuracy of electrode falling detection is further affected, so when the electrode voltage is low level, the second switching tube is turned off, thereby preventing the electrode voltage from becoming high level, and improving the accuracy of electrode falling detection.
In one possible embodiment, as shown in fig. 5, another schematic structure of the electrode falling-off detection circuit provided by the present application is shown. In fig. 5, the circuit further includes a second protection unit 51, where the second protection unit 51 includes a first resistor 511, a second resistor 512, a third resistor 513, a fifth switching tube 514, and a first capacitor 515; the first end of the first resistor 511 is connected with the first pin of the first switching tube 31, and the second end of the first resistor 511 is connected with the second pin of the first switching tube 31 and the first end of the second resistor 512; a second end of the second resistor 512 is connected to a first pin of the fifth switching tube 514; the second pin of the fifth switching tube 514 is connected with the first end of the third resistor 513 and the first end of the first capacitor 515, and the third pin of the fifth switching tube 514 and the second end of the first capacitor 515 are grounded; a second terminal of the third resistor 513 is connected to the processing unit 12 for receiving the first control signal transmitted by the processing unit 12.
In the circuit shown in fig. 5, the first capacitor 515 has a charge-discharge characteristic, and when the first control signal is at a high level, the first capacitor 515 is charged, so that when the first control signal is switched to a low level, the fifth switching tube 514 is still kept on due to the discharging action of the first capacitor 515, so that a path is formed between the first resistor 511, the second resistor 512, the fifth switching tube 514 and the ground point, thereby realizing the protection action of the first switching tube 31.
In one possible embodiment, as shown in fig. 6, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 6, the circuit further includes a third protection unit 61, where the third protection unit 61 includes a fourth resistor 611, a fifth resistor 612, a sixth resistor 613, a sixth switching tube 614, and a second capacitor 615; the first end of the fourth resistor 611 is connected with the first pin of the third switching tube 33, and the second end of the fourth resistor 611 is connected with the second pin of the third switching tube 33 and the first end of the fifth resistor 612; a second end of the fifth resistor 612 is connected to a first pin of the sixth switching tube 614; the second pin of the sixth switching tube 614 is connected to the first end of the sixth resistor 613 and the first end of the second capacitor 615, and the third pin of the sixth switching tube 614 and the second end of the second capacitor 615 are grounded; a second terminal of the sixth resistor 613 is connected to the processing unit 12, so as to receive the third control signal transmitted by the processing unit 12.
In the circuit shown in fig. 6, the second capacitor 615 has a charge-discharge characteristic, and when the third control signal is at a high level, the first capacitor 615 is charged, so that when the third control signal is switched to a low level, the sixth switching tube 614 can still maintain on due to the discharging action of the first capacitor 615, so that a path is formed between the fourth resistor 611, the fifth resistor 612, the sixth switching tube 614 and the ground point, and the protection action of the third switching tube 33 is realized.
In one possible embodiment, as shown in fig. 7, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 7, the circuit further includes a safety recovery unit 71, the safety recovery unit 71 being connected to the signal generation unit 11; wherein, when the electrode voltage of the electrode acquisition point of the signal generating unit 11 is at a high level, the electrode current flowing through the electrode corresponds to the set voltage accessed by the safety recovery unit 71, comprising: when the set voltage increases, the electrode current increases; as the set voltage decreases, the electrode current decreases.
Based on the above-described circuit, the electrode current corresponds to the set voltage to which the safety recovery unit 71 is connected, so that the magnitude of the electrode current is not affected by the input voltage of the signal generating unit 11, and can be controlled by the set voltage of the safety recovery unit, thereby meeting the requirements of different patients for the tolerance of different electrode currents. When the bearing degree of the user to the electrode current is large, the setting voltage can be gradually increased, so that the electrode current is increased, and the electric stimulation is enhanced; when the bearing degree of the user to the electrode current is smaller, the setting voltage can be adjusted down step by step, so that the electrode current is reduced, the electric stimulation is reduced, and the user experience is improved.
In one possible embodiment, as shown in fig. 8, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 8, the safety recovery unit 71 includes an amplifier 81, a seventh switching tube 82, a seventh resistor 83; the first pin of the seventh switching tube 82 is connected with the signal generating unit 11, the second pin of the seventh switching tube 82 is connected with the output end of the amplifier 81, and the third pin of the seventh switching tube 82 is connected with the first end of the seventh resistor 83 and the negative input end of the amplifier 81; the second end of the seventh resistor 83 is grounded; the positive input of the amplifier 81 is connected to a set voltage. According to the characteristics of the amplifier, the voltages at the positive input terminal and the negative input terminal of the amplifier 81 are equal, and the voltage at the negative input terminal of the amplifier 81 is equal to the set voltage, and the magnitude of the current flowing through the seventh resistor 83 is determined by the set voltage and the seventh resistor 83. Since the current flowing through the seventh resistor 83 is equal to the electrode current generated by the signal generating unit 11, when the set voltage increases when the seventh resistor 83 is a constant resistor, the current flowing through the seventh resistor 83 increases, and the electrode current increases; if the set voltage decreases, the current flowing through the seventh resistor 83 decreases, thereby decreasing the electrode current.
Based on the circuit, the electrode current is not influenced by the input voltage of the signal generating unit, and can be controlled by the set voltage of the safety recovery unit, so that the requirements of different patients on the bearing degree of different electrode currents can be met. When the bearing degree of the user to the electrode current is large, the setting voltage can be gradually increased, so that the electrode current is increased, and the electric stimulation is enhanced; when the bearing degree of the user to the electrode current is smaller, the setting voltage can be adjusted down step by step, so that the electrode current is reduced, the electric stimulation is reduced, and the user experience is improved.
In a possible embodiment, the detection unit 13 in the above-mentioned circuit comprises at least 3 pins; a first pin of at least 3 pins is connected with the signal generating unit 11, a second pin of at least 3 pins is connected with the processing unit 12, and a third pin of at least 3 pins is used for outputting a falling detection result of the electrode; and when the voltage signal received by the second pin of the at least 3 pins is smaller than the reference voltage, a path is formed between the third pin of the at least 3 pins and the first pin of the at least 3 pins.
Exemplary, as shown in fig. 9, a schematic structural diagram of another electrode falling-off detection circuit provided by the application is shown. In fig. 9, the detection unit 13 includes a comparator 91 and an eighth switching tube 92, and the comparator 91 and the eighth switching tube 92 are connected; a first end of the comparator 91 is connected with a reference voltage, a second end of the comparator 91 is connected with the processing unit 12, and a third end of the comparator 91 is connected with a first pin of the eighth switching tube 92; the second pin of the eighth switching tube 92 is connected with the signal generating unit 11, and the third pin of the eighth switching tube 92 is used for outputting a first falling detection result of the electrode; when the input reference voltage is greater than the voltage signal, the third terminal of the comparator 91 outputs a sixth control signal to control conduction between the second pin of the eighth switching tube 92 and the third pin of the eighth switching tube 92.
Exemplary, as shown in fig. 10, a schematic structural diagram of another electrode falling-off detection circuit provided by the present application is shown. In fig. 10, the detection unit 13 includes an optocoupler 101 and an eighth resistor 102; the first end of the optical coupler 101 is connected with a reference voltage through an eighth resistor 102, the second end of the optical coupler 101 is connected with the processing unit 12, the third end of the optical coupler 101 is connected with the signal generating unit 11, and the fourth end of the optical coupler 101 outputs a first falling-off detection result of an electrode; when the reference voltage is greater than the voltage signal, the light emitting resistor in the optocoupler 101 is turned on, so as to emit light, so that the sensing side (the third end of the optocoupler 101 and the fourth end of the optocoupler 101) is turned on after sensing the light emitted by the light emitting diode.
Based on the circuit, when the voltage signal is smaller than the reference voltage, the detection unit can be triggered to output a trigger signal of the falling detection result, and the switching rule of the voltage signal is controllable, so that the trigger range of the trigger signal is controllable, and the falling detection precision of the electrode is improved. In addition, when the voltage signal meets the preset condition, the falling detection result of the electrode is output based on the electrode voltage, and the electrode voltage is prevented from being directly detected, so that the damage to detection equipment is prevented when the electrode voltage is too high.
In one possible embodiment, as shown in fig. 11, another schematic structure of the electrode falling-off detection circuit provided in the present application is shown. In fig. 11, the circuit further includes a fourth protection unit 111, and the fourth protection unit 111 includes a ninth resistor 1111, a tenth resistor 1112, and a diode 1113; a first end of the ninth resistor 1111 is connected to the output end of the detecting unit 13, a second end of the ninth resistor 1111 is connected to the first end of the tenth resistor 1112, and a second end of the tenth resistor 1112 is grounded; the anode of the diode 1113 is connected to the second end of the tenth resistor 1112, and the cathode of the diode 1113 is connected to the first end of the tenth resistor 1112; wherein, a first end of the ninth resistor 1111 is used for receiving the first drop detection result of the electrode, and a second end of the ninth resistor 1111 is used for outputting the second drop detection result of the electrode.
Based on the above circuit, when the electrode voltage is too large, the diode 1113 breaks down, so that the detection point of the detection device is grounded, and protection of the detection device is realized. Optionally, diode 1113 is a zener diode.
In order to more clearly illustrate the overcurrent protection circuit diagram provided by the embodiment of the application, the following detailed description is given by a specific example.
Specifically, as shown in fig. 12, an exemplary diagram of an electrode falling-off detection circuit according to an embodiment of the present application is shown. In fig. 12, R1 to R10 are resistors, Q1 to Q8 are triodes, Q8 is an N-channel enhancement MOS transistor, C1 to C2 are capacitors, D1 is a zener diode, stim_n and stim_p are electrode voltages respectively, HVDC and VCC are supply voltages, hv_ctrl is a voltage signal generated by a processing unit for HVDC, rec_det is an electrode falling detection result, dac_out is a set voltage, hv_lat is a control signal generated for HVDC, and HA, HB, HC, HD is a control signal corresponding to Q3, Q4, Q1, and Q2 respectively. The waveforms of the control signals of HA, HB, HC, HD may refer to fig. 13, in which in fig. 13, the waveforms of HA and HD are the same, the waveforms of HB and HC are the same, and the waveforms of HA and HD are opposite to those of HB and HC.
When HA and HD are in high level, HB and HC are in low level, at the moment, Q3 and Q2 are conducted, and Q1 and Q4 are closed; when HA and HD are low, HB and HC are high, and Q3 and Q2 are off, and Q1 and Q4 are on. In both cases, if there is no electrode drop, a path is formed between the electrodes corresponding to stim_n and stim_p, respectively, and the body, and the electrode voltage stim_n is not 0; when the electrode falls off, an open circuit is formed between the electrodes corresponding to stim_n and stim_p, and when HA goes low, the electrode voltage stim_n is 0.
When the electrode voltage stim_n is detected to be 0, the processing unit controls HVDC to be 0 and controls hv_lat of the output to be 0 in order to secure the circuit safety. In addition, the processing unit also controls HV_CTRL to be 0, and as HV_CTRL is 0, HV_CTRL in the optocoupler is smaller than VCC, so that the diode emits light, the sensing side is conducted, the REC_DET is output to be 0, and the electrode falling is determined. Here, it is not directly determined whether or not there is electrode detachment by taking the electrode voltage stim_n as a detection target, and since the voltage is relatively high when the electrode voltage stim_n is not 0, there is a possibility that the detection device is damaged, and thus the detection device can be protected by taking hv_lat as a control signal for triggering the optocoupler.
In addition, in the circuit, the size of the DAC_OUT can be flexibly adjusted, so that the current flowing through the resistor R7 is flexibly adjusted, the control of the current flowing through the electrode is realized, and the user experience is improved.
Based on the circuit, when the electrode is subjected to falling detection, the input voltage HVDC is converted into the corresponding voltage signal HV_CTRL, and the voltage signal HV_CTRL is used as a trigger signal for triggering the detection unit to output a falling detection result. In addition, when the voltage signal hv_ctrl is 0, the falling detection result of the electrode is output based on the electrode voltage, so that the electrode voltage stim_n is prevented from being directly detected, and damage to the detection equipment is prevented when the electrode voltage is too high.
The application also provides electrode falling detection equipment, which comprises any electrode falling detection circuit according to the embodiment, so that when the electrode falling detection equipment is used for carrying out falling detection on an electrode, input voltage is converted into corresponding voltage signals, the voltage signals are used as trigger signals for triggering a detection unit to output falling detection results, and the conversion rule of the voltage signals is controllable, so that the trigger range of the trigger signals is controllable, and the falling detection precision of the electrode is improved. In addition, when the voltage signal meets the preset condition, the electrode voltage is output based on the falling detection result of the electrode, so that the electrode voltage is prevented from being directly detected, and the damage to detection equipment is prevented when the electrode voltage is too high.
It should be noted that, the drawings merely illustrate examples, and are not limiting to the structure of the circuit diagrams, where each circuit diagram may be parallel, progressive, or combined, or the circuit units in each circuit diagram may be combined with each other by reference to each other, and the embodiment of the present application is not limited by the specific combination manner.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (11)
1. The electrode falling detection circuit is characterized by comprising a signal generation unit, a processing unit and a detection unit, wherein the signal generation unit and the processing unit are respectively connected with the detection unit;
The signal generating unit comprises a first switching tube, a second switching tube, a third switching tube and a fourth switching tube; the first switching tube, the second switching tube, the fourth switching tube and the third switching tube are connected in an annular mode, and the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively connected with the processing unit; an access point for input voltage is arranged between the first switching tube and the third switching tube connecting line, and a grounding point is arranged between the second switching tube and the fourth switching tube connecting line; the first switching tube, the second switching tube, the third switching tube and the fourth switching tube are respectively provided with an access point of an electrode, and the access point of the electrode is an acquisition point of electrode voltage; when the first switching tube is controlled to be conducted by the processing unit through a first control signal, the second switching tube is controlled to be closed through a second control signal, the third switching tube is controlled to be closed through a third control signal, and the fourth switching tube is controlled to be conducted through a fourth control signal; when the processing unit controls the first switching tube to be closed through a first control signal, the second switching tube is controlled to be conducted through a second control signal, the third switching tube is controlled to be conducted through a third control signal, and the fourth switching tube is controlled to be closed through a fourth control signal;
The detection unit comprises at least 3 pins; a first pin of the at least 3 pins is connected with the signal generating unit, a second pin of the at least 3 pins is connected with the processing unit, and a third pin of the at least 3 pins is used for outputting a falling detection result of the electrode; when the voltage signal received by the second pin of the at least 3 pins is smaller than the reference voltage, a passage is formed between the third pin of the at least 3 pins and the first pin of the at least 3 pins, and the falling detection result of the electrode is output based on the electrode voltage;
When the input voltage is connected to the signal generating unit, the signal generating unit generates the electrode voltage and transmits the electrode voltage to the detecting unit; the processing unit generates a voltage signal corresponding to the input voltage and transmits the voltage signal to the detection unit; and when the voltage signal is at a low level, the detection unit judges whether the electrode voltage continuously maintains the low level within a preset time, and if so, the detection unit confirms that the electrode falls off.
2. The circuit of claim 1, wherein the input voltage is generated by a power supply unit, the power supply unit being coupled to the processing unit, the processing unit being coupled to the signal generation unit;
Wherein, when the electrode falls off, the electrode voltage is at a low level; when the electrode voltage is at a low level, the processing unit controls the power supply unit to disconnect the input voltage; when the electrode voltage is at a high level, the processing unit controls the power supply unit to output the input voltage.
3. The circuit of claim 1, further comprising a first protection unit;
The first pin of the first protection unit is connected with the access end of the second control signal corresponding to the second switch tube, the second pin of the first protection unit is connected with the processing unit, and the third pin of the first protection unit is grounded;
The processing unit controls on or off between the first pin of the first protection unit and the third pin of the first protection unit by inputting a fifth control signal to the second pin of the first protection unit, and the processing unit comprises:
When the electrode voltage is a low-level signal, the fifth control signal is a high-level signal, and the first pin of the first protection unit is conducted with the third pin of the first protection unit; when the electrode voltage is a high-level signal, the fifth control signal is a low-level signal, and the first pin of the first protection unit and the third pin of the first protection unit are closed.
4. The circuit of claim 1, further comprising a second protection unit comprising a first resistor, a second resistor, a third resistor, a fifth switching tube, and a first capacitor;
The first end of the first resistor is connected with the first pin of the first switching tube, and the second end of the first resistor is connected with the second pin of the first switching tube and the first end of the second resistor;
The second end of the second resistor is connected with the first pin of the fifth switching tube;
The second pin of the fifth switching tube is connected with the first end of the third resistor and the first end of the first capacitor, and the third pin of the fifth switching tube and the second end of the first capacitor are grounded;
the second end of the third resistor is connected with the processing unit to receive the first control signal transmitted by the processing unit.
5. The circuit of claim 1, further comprising a third protection unit comprising a fourth resistor, a fifth resistor, a sixth switching tube, and a second capacitor;
The first end of the fourth resistor is connected with the first pin of the third switching tube, and the second end of the fourth resistor is connected with the second pin of the third switching tube and the first end of the fifth resistor;
the second end of the fifth resistor is connected with the first pin of the sixth switching tube;
The second pin of the sixth switching tube is connected with the first end of the sixth resistor and the first end of the second capacitor, and the third pin of the sixth switching tube and the second end of the second capacitor are grounded;
the second end of the sixth resistor is connected with the processing unit to receive the third control signal transmitted by the processing unit.
6. The circuit of claim 1, further comprising a security recovery unit coupled to the signal generation unit;
when the electrode voltage is at a high level, the electrode current flowing through the electrode corresponds to the set voltage accessed by the safety recovery unit, and the method comprises the following steps:
When the set voltage increases, the electrode current increases;
as the set voltage decreases, the electrode current decreases.
7. The circuit of claim 6, wherein the safety recovery unit comprises an amplifier, a seventh switching tube, a seventh resistor;
the first pin of the seventh switching tube is connected with the signal generating unit, the second pin of the seventh switching tube is connected with the output end of the amplifier, and the third pin of the seventh switching tube is connected with the first end of the seventh resistor and the negative input end of the amplifier;
the second end of the seventh resistor is grounded;
and the positive input end of the amplifier is connected to the set voltage.
8. The circuit of claim 1, wherein the detection unit comprises a comparator and an eighth switching tube, the comparator being connected to the eighth switching tube;
the first end of the comparator is connected with a reference voltage, the second end of the comparator is connected with the processing unit, and the third end of the comparator is connected with the first pin of the eighth switching tube;
the second pin of the eighth switching tube is connected with the signal generating unit, and the third pin of the eighth switching tube is used for outputting a first falling detection result of the electrode;
When the reference voltage is input and is larger than the voltage signal, the third end of the comparator outputs a sixth control signal to control conduction between the second pin of the eighth switching tube and the third pin of the eighth switching tube.
9. The circuit of claim 1, wherein the detection unit comprises an optocoupler and an eighth resistor;
The first end of the optical coupler is connected with a reference voltage through the eighth resistor, the second end of the optical coupler is connected with the processing unit, the third end of the optical coupler is connected with the signal generating unit, and the fourth end of the optical coupler outputs a first falling-off detection result of the electrode;
and when the reference voltage is larger than the voltage signal, the third end of the optocoupler is conducted with the fourth end of the optocoupler.
10. The circuit of claim 1, further comprising a fourth protection unit comprising a ninth resistor, a tenth resistor, and a diode;
The first end of the ninth resistor is connected with the output end of the detection unit, the second end of the ninth resistor is connected with the first end of the tenth resistor, and the second end of the tenth resistor is grounded;
The anode of the diode is connected with the second end of the tenth resistor, and the cathode of the diode is connected with the first end of the tenth resistor;
the first end of the ninth resistor is used for receiving a first falling-off detection result of the electrode, and the second end of the ninth resistor is used for outputting a second falling-off detection result of the electrode.
11. An electrode fall-off detection apparatus comprising the circuit of any one of claims 1-10.
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