CN204600460U - The induction reactance regulating circuit of ECG detecting circuit and ECG detecting equipment - Google Patents
The induction reactance regulating circuit of ECG detecting circuit and ECG detecting equipment Download PDFInfo
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Abstract
The utility model discloses a kind of induction reactance regulating circuit of ECG detecting circuit, the induction reactance regulating circuit of this ECG detecting circuit comprises voltage comparator circuit and induction reactance translation circuit, the input of voltage comparator circuit is connected with the outfan of pre-amplification circuit, the outfan of voltage comparator circuit is connected with the input of induction reactance translation circuit, and the outfan of induction reactance translation circuit is connected with the input of pre-amplification circuit.The invention also discloses a kind of ECG detecting equipment.This utility model solves the technical problem of the input induction reactance instability of ECG detecting circuit, improves the stability of circuit, and can improve the accuracy of the electrocardiosignal that circuit exports.
Description
Technical Field
The utility model relates to an electrocardio detects technical field, especially relates to an electrocardio detection circuitry's inductance and reactance regulating circuit and electrocardio check out test set.
Background
Cardiovascular diseases have been receiving medical attention as one of three major diseases threatening human health (cardiovascular diseases, cerebrovascular diseases, cancer). With the progress of society and the improvement of living standard of people, the demand of the general public for the monitoring of heart health condition is also increased explosively, and the diagnosis of cardiovascular diseases and the monitoring of heart condition are already hot topics of the current society.
The human body surface waveguide theory tells that the changing electric potential generated by the heart in the processes of depolarization and repolarization forms a changing electric field on the surface of the human body, and the changing trend is displayed on a drawing or a screen by monitoring the change of the electric field, which is the Electrocardiogram (ECG) monitoring which is commonly seen in hospitals. Most of the existing electrocardiograph monitoring devices monitor electrocardiograph based on resistance coupling, capacitance coupling or inductance coupling. The new technologies bring great convenience to people for dynamically monitoring electrocardio and using at home, and have been widely applied to actual clinical and health care.
Based on the existing inductance coupling type electrocardio monitoring system, the signal processing mode is that electrocardio signals collected by an electrocardio sensor are directly transmitted to a preamplifier circuit, followed and processed and then output to a post-stage processing circuit. However, because the input stage inductive reactance of the inductive coupling type electrocardiograph monitoring system is relatively small, and the inductive reactance characteristic of the human body surface is very complex and not invariable, if the detection electrode of the electrocardiograph sensor slides or the surface skin humidity and the salinity and alkalinity of the detected body change in the monitoring process, the inductance output by the inductive coupling type electrocardiograph monitoring system can be irregularly changed, and the change can influence the accuracy of the rear-stage circuit for reading the electrocardiograph data, so that the electrocardiograph detection effect is greatly reduced, and even the judgment of a doctor can be misled.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electrocardio detection circuitry's inductance adjusting circuit aims at solving the easy technical problem who changes of inductance coupling formula electrocardio detection circuitry's input inductance, improves the accuracy that the electrocardio detected.
In order to achieve the above object, the present invention provides an impedance adjusting circuit for an electrocardiograph detection circuit, wherein the electrocardiograph detection circuit comprises an electrocardiograph detection electrode and a preamplifier circuit, and the preamplifier circuit receives an electrocardiograph signal collected by the electrocardiograph detection electrode, and outputs the received electrocardiograph signal after signal following; the inductive reactance regulating circuit of the electrocardio detection circuit comprises a voltage comparison circuit and an inductive reactance converting circuit, wherein the input end of the voltage comparison circuit is connected with the output end of the preamplification circuit, the output end of the voltage comparison circuit is connected with the input end of the inductive reactance converting circuit, and the output end of the inductive reactance converting circuit is connected with the input end of the preamplification circuit; wherein,
the voltage comparison circuit is used for detecting the electrocardiosignals output after the processing of the preamplification circuit, comparing the voltage values of the detected electrocardiosignals with the reference voltage signals and then outputting voltage control signals generated after the comparison; the inductive reactance conversion circuit outputs inductive reactance signals with corresponding sizes to compensate to the input end of the preamplification circuit along with the voltage change of the voltage control signal.
Preferably, the voltage comparison circuit includes a comparator, a positive input terminal of the comparator is connected to the output terminal of the pre-amplification circuit, a negative input terminal of the comparator inputs the reference voltage signal, and an output terminal of the comparator is connected to the input terminal of the inductive reactance conversion circuit.
Preferably, the voltage comparison circuit further includes a signal amplifier, an input end of the signal amplifier is connected to an output end of the pre-amplification circuit, an output end of the signal amplifier is connected to a positive input end of the comparator, and the signal amplifier amplifies a voltage signal output by the pre-amplification circuit and then transmits the amplified voltage signal to the comparator for voltage comparison.
Preferably, the signal amplifier includes a first operational amplifier, a first resistor, a second resistor, and a third resistor, an inverting input terminal of the first operational amplifier is an input terminal of the signal amplifier, and an output terminal of the first operational amplifier is an output terminal of the signal amplifier; the forward input end of the first operational amplifier is grounded through the first resistor, the reverse input end of the first operational amplifier is connected with the output end of the pre-amplification circuit through the second resistor, the output end of the first operational amplifier is connected with the forward input end of the comparator, and meanwhile, the reverse input end of the first operational amplifier is connected through the third resistor.
Preferably, the inductive reactance conversion circuit comprises a variable capacitor, a second operational amplifier, a third operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, and the electrocardiograph detection electrode is connected with the positive input end of the preamplifier circuit through the fourth resistor, the fifth resistor and the sixth resistor in sequence; the reverse input end of the second operational amplifier is connected between the fourth resistor and the fifth resistor, the output end of the second operational amplifier is connected between the fifth resistor and the sixth resistor, the forward input end of the second operational amplifier is connected between the sixth resistor and the forward input end of the pre-amplification circuit, and the forward input end of the second operational amplifier is further connected with the reverse input end of the third operational amplifier through the seventh resistor; a positive input end of the third operational amplifier is connected with a cathode of the variable capacitor, an output end of the third operational amplifier is respectively connected with a first end of the eighth resistor and a first end of the ninth resistor, a second end of the eighth resistor is connected between the seventh resistor and a reverse input end of the third operational amplifier, a second end of the ninth resistor is respectively connected with the positive input end of the third operational amplifier, the cathode of the variable capacitor and a first end of the tenth resistor, and a second end of the tenth resistor is grounded; and the anode of the variable capacitor is connected between the electrocardio detection electrode and the fourth resistor.
Preferably, the variable capacitance is a varactor.
In order to achieve the above object, the present invention provides an electrocardiograph detection apparatus, which comprises an electrocardiograph detection electrode for collecting electrocardiograph signals of a measured object, a preamplifier circuit for performing signal following processing on the electrocardiograph signals collected by the electrocardiograph detection electrode, and an impedance adjusting circuit of the electrocardiograph detection circuit; the inductive reactance regulating circuit of the electrocardio detection circuit comprises a voltage comparison circuit and an inductive reactance converting circuit, wherein the input end of the voltage comparison circuit is connected with the output end of the preamplification circuit, the output end of the voltage comparison circuit is connected with the input end of the inductive reactance converting circuit, and the output end of the inductive reactance converting circuit is connected with the input end of the preamplification circuit; the voltage comparison circuit is used for detecting the electrocardiosignals output after being processed by the preamplification circuit, comparing the voltage values of the detected electrocardiosignals with a reference voltage signal and then outputting a voltage control signal generated after comparison; the inductive reactance conversion circuit outputs inductive reactance signals with corresponding sizes to compensate to the input end of the preamplification circuit along with the voltage change of the voltage control signal; the input end of the preamplification circuit is connected with the electrocardio detection electrode and the output end of the inductance-reactance conversion circuit of the inductance-reactance regulation circuit of the electrocardio detection circuit, and the output end of the preamplification circuit is connected with the input end of the voltage comparison circuit of the inductance-reactance regulation circuit of the electrocardio detection circuit.
Preferably, the preamplifier circuit includes an operational amplifier, a forward input end of the operational amplifier is an input end of the preamplifier circuit, an output end of the operational amplifier is an output end of the preamplifier circuit, and an output end of the operational amplifier is further connected to a reverse input end of the operational amplifier.
Preferably, the electrocardio-detecting electrode comprises an insulator, the insulator comprises a first side surface and a second side surface which are opposite, the first side surface is provided with a first inductance coil for inducing electrocardiosignals of a detected body, and the second side surface is provided with a second inductance coil corresponding to the first inductance coil; when the first inductance coil induces the electrocardiosignals of the detected body, the second inductance coil and the first inductance coil form mutual inductance, and electric signals corresponding to the electrocardiosignals on the first inductance coil are formed on the second inductance coil.
Preferably, the first inductance coil is formed by arranging a high-permeability metal wire in a planar spiral shape.
The utility model discloses a set up the electrocardiosignal of output after the leading amplifier circuit of voltage comparison circuit detection this electrocardio detection circuitry handles, then carry out the magnitude of voltage comparison with the reference voltage signal electrocardiosignal that will detect, then carry the voltage control signal that will generate after the comparison to the inductance transform circuit for the inductance transform circuit follows the magnitude of the voltage control signal of voltage comparison circuit output and exports corresponding size the inductance signal extremely the input of leading amplifier circuit to compensate the inductance of this electrocardio detection circuitry, thereby play the purpose of adaptive control electrocardio detection circuitry inductance, improve the stability of circuit and the accuracy of the electrocardiosignal of output.
Drawings
FIG. 1 is a circuit block diagram of a preferred embodiment of an inductive reactance adjusting circuit of the electrocardiograph detection circuit of the present invention;
FIG. 2 is a schematic diagram of a preferred embodiment of an inductive reactance adjusting circuit of the electrocardiograph detection circuit of the present invention;
fig. 3 is the structural schematic diagram of the electrocardiograph detection electrode in the electrocardiograph detection device of the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides an electrocardio detection circuitry's inductance reactance regulating circuit for adjust the inductance in the electrocardio detection circuitry, electrocardio detection circuitry includes electrocardio detection electrode and leading amplifier circuit, and leading amplifier circuit's input is connected with electrocardio detection electrode, with the electrocardiosignal that receives electrocardio detection electrode and gather, and to receiving electrocardiosignal carry out the signal with export to back end processing circuit afterwards, carry out further processing.
Referring to fig. 1 and 2, in an embodiment, the impedance adjusting circuit of the electrocardiograph detection circuit includes a voltage comparing circuit 100 and an impedance transforming circuit 200, an input terminal of the voltage comparing circuit 100 is connected to an output terminal of the pre-amplifier circuit 300, an output terminal of the voltage comparing circuit 100 is connected to an input terminal of the impedance transforming circuit 200, and an output terminal of the impedance transforming circuit 200 is connected to an input terminal of the pre-amplifier circuit 300.
The voltage comparison circuit 100 is configured to detect an electrocardiographic signal output after being processed by the preamplifier circuit 300, compare the voltage value of the detected electrocardiographic signal with a reference voltage signal VREF, and output a voltage control signal generated after the comparison; the inductance-reactance converting circuit 200 outputs the inductance-reactance signal with the corresponding magnitude to compensate to the input end of the pre-amplifier circuit 300 following the voltage change of the voltage control signal, so as to adjust the input inductance of the pre-amplifier circuit 300.
It should be noted that the electrocardiographic signal induced in the electrocardiographic detection circuit changes correspondingly with the fluctuation of the input inductive reactance, that is, when the input inductive reactance rises, the induced electrocardiographic signal (voltage) rises, and when the input inductive reactance falls, the induced electrocardiographic signal (voltage) also falls, so that the change of the input inductive reactance of the preamplifier circuit can be known by detecting the voltage change of the electrocardiographic signal output by the preamplifier circuit 300, and the accuracy of the finally output electrocardiographic signal can be ensured by adjusting the input inductive reactance of the electrocardiographic detection circuit according to the voltage change of the electrocardiographic signal.
In this embodiment, the voltage comparison circuit 100 includes a comparator 11, a forward input terminal of the comparator 11 is connected to an output terminal of the pre-amplification circuit 300, a backward input terminal of the comparator 11 inputs the reference voltage signal VREF, and an output terminal of the comparator 11 is connected to an input terminal of the inductive reactance conversion circuit 200.
It can be understood that the electrocardiographic signal input to the positive input terminal of the comparator 11 is an alternating current signal, the reference voltage signal VREF is a direct current level signal, according to the pulse width modulation theory, the detected electrocardiographic signal is compared with the reference voltage signal VREF, the proportion of the high level of the electrocardiographic signal (alternating current signal) above the reference voltage signal VREF (fixed level) and the low level of the electrocardiographic signal below the reference voltage signal VREF in one period is analyzed, the output terminal of the comparator 11 outputs an equivalent voltage corresponding to the duty ratio of the high level, and the equivalent voltage is a voltage control signal generated after the electrocardiographic signal and the reference voltage signal VREF are compared by the voltage comparator 11.
In this embodiment, because the signal collected by the electrocardiograph detection electrode 400 is relatively small, the signal amplifier 12 can be further arranged to amplify the electrocardiograph signal and then compare the amplified electrocardiograph signal, so as to improve the accuracy of signal detection; the input end of the signal amplifier 12 is connected to the output end of the pre-amplification circuit 300, the output end of the signal amplifier 12 is connected to the positive input end of the comparator 11, and the signal amplifier 12 amplifies the voltage signal output by the pre-amplification circuit 300 and then transmits the amplified voltage signal to the comparator 11 for voltage comparison.
The signal amplifier 12 comprises a first operational amplifier U1, a first resistor R1, a second resistor R2 and a third resistor R3, wherein an inverting input terminal of the first operational amplifier U1 is an input terminal of the signal amplifier 12, and an output terminal of the first operational amplifier U1 is an output terminal of the signal amplifier 12; the forward input end of U1 is put to first fortune is through first resistance R1 ground connection, the reverse input end of U1 is put to first fortune is through second resistance R2 with the output of preamplification circuit 300 is connected, the output that U1 was put to first fortune is divided into two tunnel, all the way with the reverse input end of comparator 11 is connected, another way warp third resistance R3 with the reverse input end of first fortune is put U1 is connected.
In this embodiment, the inductance-reactance converting circuit 200 includes a variable capacitor C1, a second operational amplifier U2, a third operational amplifier U3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10, and the electrocardiograph detection electrode 400 is connected to the positive input terminal of the pre-amplification circuit 300 through the fourth resistor R4, the fifth resistor R5, and the sixth resistor R6 of the inductance-reactance converting circuit 200 in sequence; the reverse input end of the second operational amplifier U2 is connected between the fourth resistor R4 and the fifth resistor R5, the output end of the second operational amplifier U2 is connected between the fifth resistor R5 and the sixth resistor R6, the forward input end of the second operational amplifier U2 is connected between the sixth resistor R6 and the forward input end of the preamplifier circuit 300, and the forward input end of the second operational amplifier U2 is further connected with the reverse input end of the third operational amplifier U3 through the seventh resistor R7; a positive input end of the third operational amplifier U3 is connected to a cathode of the variable capacitor C1, output ends of the third operational amplifier U3 are respectively connected to a first end of the eighth resistor R8 and a first end of the ninth resistor R9, a second end of the eighth resistor R8 is connected between the seventh resistor R7 and a reverse input end of the third operational amplifier U3, a second end of the ninth resistor R9 is respectively connected to a positive input end of the third operational amplifier U3, a cathode of the variable capacitor C1 and a first end of the tenth resistor R10, and a second end of the tenth resistor R10 is grounded; the anode of the variable capacitor C1 is connected between the ECG detecting electrode 400 and the fourth resistor R4.
The second operational amplifier U2 and the third operational amplifier U3 form a gyrator through peripheral bias resistors, the output inductive reactance of the gyrator changes correspondingly along with the change of the capacitance of the variable capacitor C1, and the change is as follows: the larger the capacitance of the variable capacitor C1, the larger the output inductive reactance of the gyrator, and the smaller the capacitance of the variable capacitor C1, the smaller the output inductive reactance of the gyrator. The variable capacitor C1 can be implemented by a varactor diode, wherein the junction capacitance is smaller when the reverse bias voltage of the varactor diode is larger. Therefore, when the cathode of the variable capacitor C1 receives the voltage control signal outputted from the voltage comparison circuit 100, the capacitance of the variable capacitor C1 becomes smaller as the voltage outputted from the voltage comparison circuit 100 increases, and becomes larger as the voltage outputted from the voltage comparison circuit 100 decreases.
It can be understood that, when the voltage comparison circuit 100 detects that the voltage corresponding to the electrocardiographic signal output by the preamplifier circuit 300 of the electrocardiograph detection circuit is high (indicating that the input inductive reactance in the electrocardiograph detection circuit is high), after the comparison by the comparator 11 in the voltage comparison circuit 100, the output end of the comparator 11 outputs a voltage control signal with a high level, then the capacitance of the variable capacitor C1 is correspondingly reduced, and then the output inductive reactance of the gyrator composed of the second operational amplifier U2 and the third operational amplifier U3 through the peripheral bias resistors thereof is correspondingly reduced, so that the inductive reactance of the gyrator compensated to the electrocardiograph detection circuit is reduced, thereby reducing the input inductive reactance of the electrocardiograph detection circuit, making the circuit tend to be stable, and ensuring the accuracy of the electrocardiographic signal. Similarly, when the voltage comparison circuit 100 detects that the voltage corresponding to the electrocardiographic signal output by the preamplifier circuit 300 of the electrocardiograph detection circuit is low (indicating that the input inductive reactance in the electrocardiograph detection circuit is low), after the comparison by the comparator 11 in the voltage comparison circuit 100, the output end of the comparator 11 outputs a voltage control signal with a low level, so that the capacitance of the variable capacitor C1 is correspondingly increased, and then the output inductive reactance of the gyrator composed of the second operational amplifier U2 and the third operational amplifier U3 through the peripheral bias resistors thereof is correspondingly increased, so that the inductive reactance of the gyrator in the electrocardiograph detection circuit is increased, and further the input inductive reactance of the electrocardiograph detection circuit is increased, so that the circuit tends to be stable, and the accuracy of the electrocardiographic signal is ensured.
To sum up, the utility model provides an electrocardio detection circuitry's inductance reactance regulating circuit passes through the electrocardiosignal that this electrocardio detection circuitry's preamplification circuit 300 handled the back output of voltage comparison circuit 100 detection, then carries out the voltage value with electrocardiosignal that detects and reference voltage signal VREF and compares, then carries the voltage control signal who generates after comparing to inductance reactance converting circuit 200 for inductance reactance converting circuit 200 follows the voltage control signal's of voltage comparison circuit 100 output size and output corresponding size inductance signal extremely the input of preamplification circuit 300 to compensate this electrocardio detection circuitry's input inductance, thereby play the purpose of self-adaptation regulation electrocardio detection circuitry input inductance, improve the stability of circuit and the electrocardiosignal's of output accuracy.
The utility model also provides an electrocardiograph detection device, referring to fig. 1, fig. 2 and fig. 3, in an embodiment, the electrocardiograph detection device comprises an electrocardiograph detection electrode 400, a preamplification circuit 300 and an inductive reactance adjusting circuit 500 of the electrocardiograph detection circuit; the input end of the pre-amplification circuit 300 is connected with the electrocardiograph detection electrode 400 and the output end of the inductive reactance converting circuit 200 of the inductive reactance adjusting circuit 500 of the electrocardiograph detection circuit, and the output end of the pre-amplification circuit 300 is connected with the input end of the voltage comparing circuit 100 of the inductive reactance adjusting circuit 500 of the electrocardiograph detection circuit.
The electrocardio detection electrode 400 is used for collecting electrocardiosignals of a detected body; the preamplification circuit 300 is used for performing signal following processing on the electrocardiosignals acquired by the electrocardio detection electrode 400 so as to improve the stability of the electrocardiosignals; the impedance adjusting circuit 500 of the electrocardiograph detection circuit is used for detecting the electrocardiograph signal output by the preamplifier circuit 300 and correspondingly adjusting the input impedance according to the signal voltage, so that the input impedance of the circuit is reduced when the input impedance is higher, and the input impedance of the circuit is increased when the input impedance of the circuit is lower, thereby ensuring the stability of the circuit. The detailed structure of the reactance adjustment circuit 500 of the electrocardiograph detection circuit can refer to the above embodiments, and is not described herein again; it can be understood that, because the inductance and reactance adjusting circuit 500 of the electrocardiograph detection circuit is used in the electrocardiograph detection device, the embodiment of the electrocardiograph detection device includes all technical solutions of all embodiments of the inductance and reactance adjusting circuit 500 of the electrocardiograph detection circuit, and the achieved technical effects are also completely the same, and are not described herein again.
In this embodiment, the pre-amplifier circuit 300 includes an operational amplifier U4, a positive input terminal of the operational amplifier U4 is an input terminal of the pre-amplifier circuit 300, an output terminal of the operational amplifier U4 is an output terminal of the pre-amplifier circuit 300, and an output terminal of the operational amplifier 300 is further connected to a negative input terminal thereof.
In this embodiment, the electrocardiograph detection electrode 400 includes an insulator 41, where the insulator 41 includes a first side surface and a second side surface opposite to each other, the first side surface is provided with a first inductance coil 42 for inducing electrocardiograph signals of a measured subject, and the second side surface is provided with a second inductance coil 43 corresponding to the first inductance coil 42; when the first inductor coil 42 induces an electrocardiographic signal of the subject, the second inductor coil 43 and the first inductor coil 42 form mutual inductance, and an electrical signal corresponding to the electrocardiographic signal on the first inductor coil 42 is formed on the second inductor coil 43. The first inductor coil 42 is preferably formed by a wire with high magnetic permeability in a planar spiral shape.
It should be understood that when the first inductance coil 42 is in contact with or close to the surface of the measured object, a primary side inductance resonance loop is formed with the surface of the measured object, so that weak electrocardiosignals of the measured object can be acquired; when weak electrocardiosignals are generated on the first inductance coil 42, the second inductance coil 43 and the first inductance coil 42 form mutual inductance, and the same electric signals are formed on the second inductance coil 43, so that the electrocardiosignals of the detected body are acquired.
In this embodiment, the first inductor coil 42 can be made of various metal conductor materials, and the preferred solution of this embodiment is to form the first inductor coil by a metal wire with high magnetic permeability in a planar spiral arrangement. The helical structure may be a circular arc-shaped helical structure, or may be another helical structure, such as a rectangular helical structure or an elliptical helical structure. The first inductance coil 42 made of the material and having the spiral structure is sensitive to the electrocardiosignals of the detected body such as a human body, and can sense the weak electrocardiosignals on the detected body under the condition that the first inductance coil is close to the skin surface of the detected body and does not directly contact the skin of the detected body. It should be noted that the inductive signal has little influence on the human body, does not cause the human body to feel uncomfortable, and is convenient for dynamically monitoring the electrocardio state of the human body. Similarly, the second inductor 43 can be made of various metal conductor materials as the first inductor 42, and preferably, the second inductor 43 is made of the same material as the first inductor 42 and has the same structure, so as to ensure the consistency of the electric induction signal generated on the second inductor 43 and the signal induced on the first inductor 42.
It can be understood that because the electrocardiosignal of the detected body is acquired by the inductance coil, no conductive paste is needed, the signal is less interfered and stable, and the electrocardiosignal of the detected body can be acquired under the condition that the electrocardiosignal is not directly contacted with the skin on the surface of the detected body. It is worth mentioning that the electrocardiograph detection device provided by the embodiment is applicable to dynamic electrocardiograph monitoring and household use, does not need to directly contact human skin (or can be in contact with monitoring) during use, is compatible with human bodies, and has very high practicability.
The above is only the preferred embodiment of the present invention, and not the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings or the direct or indirect application in other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. An inductance impedance adjusting circuit of an electrocardio detection circuit comprises an electrocardio detection electrode and a preamplifier circuit, wherein the preamplifier circuit receives an electrocardio signal acquired by the electrocardio detection electrode, and outputs the received electrocardio signal after signal following; the electrocardio detection circuit is characterized in that an inductive reactance regulating circuit of the electrocardio detection circuit comprises a voltage comparison circuit and an inductive reactance converting circuit, wherein the input end of the voltage comparison circuit is connected with the output end of the preamplification circuit, the output end of the voltage comparison circuit is connected with the input end of the inductive reactance converting circuit, and the output end of the inductive reactance converting circuit is connected with the input end of the preamplification circuit; wherein,
the voltage comparison circuit is used for detecting the electrocardiosignals output after the processing of the preamplification circuit, comparing the voltage values of the detected electrocardiosignals with the reference voltage signals and then outputting voltage control signals generated after the comparison; the inductive reactance conversion circuit outputs inductive reactance signals with corresponding sizes to compensate to the input end of the preamplification circuit along with the voltage change of the voltage control signal.
2. The inductance adjusting circuit of claim 1, wherein the voltage comparing circuit comprises a comparator, a positive input terminal of the comparator is connected to the output terminal of the pre-amplifying circuit, a negative input terminal of the comparator is connected to the reference voltage signal, and an output terminal of the comparator is connected to the input terminal of the inductance converting circuit.
3. The inductance-reactance adjusting circuit for electrocardiograph detection circuit according to claim 2, wherein said voltage comparison circuit further comprises a signal amplifier, an input terminal of said signal amplifier is connected to an output terminal of said pre-amplification circuit, an output terminal of said signal amplifier is connected to a positive input terminal of said comparator, said signal amplifier amplifies the voltage signal outputted from the pre-amplification circuit and then transmits the amplified voltage signal to said comparator for voltage comparison.
4. The inductance-reactance adjusting circuit for an electrocardiograph detecting circuit according to claim 3, wherein said signal amplifier comprises a first operational amplifier, a first resistor, a second resistor, and a third resistor, an inverting input terminal of said first operational amplifier is an input terminal of said signal amplifier, and an output terminal of said first operational amplifier is an output terminal of said signal amplifier; the forward input end of the first operational amplifier is grounded through the first resistor, the reverse input end of the first operational amplifier is connected with the output end of the pre-amplification circuit through the second resistor, the output end of the first operational amplifier is connected with the forward input end of the comparator, and meanwhile, the reverse input end of the first operational amplifier is connected through the third resistor.
5. The inductance reactance regulating circuit of the electrocardiograph detection circuit according to claim 3, wherein the inductance reactance converting circuit comprises a variable capacitor, a second operational amplifier, a third operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, and the electrocardiograph detection electrode is connected with the positive input end of the preamplifier circuit through the fourth resistor, the fifth resistor and the sixth resistor in sequence; the reverse input end of the second operational amplifier is connected between the fourth resistor and the fifth resistor, the output end of the second operational amplifier is connected between the fifth resistor and the sixth resistor, the forward input end of the second operational amplifier is connected between the sixth resistor and the forward input end of the pre-amplification circuit, and the forward input end of the second operational amplifier is further connected with the reverse input end of the third operational amplifier through the seventh resistor; a positive input end of the third operational amplifier is connected with a cathode of the variable capacitor, an output end of the third operational amplifier is respectively connected with a first end of the eighth resistor and a first end of the ninth resistor, a second end of the eighth resistor is connected between the seventh resistor and a reverse input end of the third operational amplifier, a second end of the ninth resistor is respectively connected with the positive input end of the third operational amplifier, the cathode of the variable capacitor and a first end of the tenth resistor, and a second end of the tenth resistor is grounded; and the anode of the variable capacitor is connected between the electrocardio detection electrode and the fourth resistor.
6. The inductance-reactance adjusting circuit of electrocardiographic detection circuit according to claim 5, wherein said variable capacitance is a varactor diode.
7. An electrocardiograph detection apparatus, characterized in that the electrocardiograph detection apparatus comprises an electrocardiograph detection electrode for collecting electrocardiograph signals of a subject, a preamplifier circuit for performing signal following processing on the electrocardiograph signals collected by the electrocardiograph detection electrode, and an inductive reactance adjustment circuit of the electrocardiograph detection circuit according to any one of claims 1 to 6; the input end of the preamplification circuit is connected with the electrocardio detection electrode and the output end of the inductance-reactance conversion circuit of the inductance-reactance regulation circuit of the electrocardio detection circuit, and the output end of the preamplification circuit is connected with the input end of the voltage comparison circuit of the inductance-reactance regulation circuit of the electrocardio detection circuit.
8. The cardiac electrical detection apparatus of claim 7, wherein the pre-amplifier circuit comprises an operational amplifier, wherein the positive input of the operational amplifier is the input of the pre-amplifier circuit, wherein the output of the operational amplifier is the output of the pre-amplifier circuit, and wherein the output of the operational amplifier is further connected to the negative input thereof.
9. The electrocardiograph sensing apparatus according to claim 7, wherein said electrocardiograph sensing electrode comprises an insulator having a first side and a second side opposite to each other, said first side having a first inductor coil for inducing electrocardiograph signals of the subject, said second side having a second inductor coil corresponding to said first inductor coil; when the first inductance coil induces the electrocardiosignals of the detected body, the second inductance coil and the first inductance coil form mutual inductance, and electric signals corresponding to the electrocardiosignals on the first inductance coil are formed on the second inductance coil.
10. The cardiac electrical detection apparatus of claim 9, wherein the first inductive coil is formed of a high permeability wire in a planar helical arrangement.
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| CN201520219859.1U CN204600460U (en) | 2015-04-13 | 2015-04-13 | The induction reactance regulating circuit of ECG detecting circuit and ECG detecting equipment |
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| CN201520219859.1U CN204600460U (en) | 2015-04-13 | 2015-04-13 | The induction reactance regulating circuit of ECG detecting circuit and ECG detecting equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104757962A (en) * | 2015-04-13 | 2015-07-08 | 深圳市飞马与星月科技研究有限公司 | Electrocardiograph detection circuit inductive reactance adjusting circuit and electrocardiograph detection equipment |
| CN111487955A (en) * | 2020-04-28 | 2020-08-04 | 北华航天工业学院 | A kind of unmanned aerial vehicle signal enhancement device and its enhancement method |
-
2015
- 2015-04-13 CN CN201520219859.1U patent/CN204600460U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104757962A (en) * | 2015-04-13 | 2015-07-08 | 深圳市飞马与星月科技研究有限公司 | Electrocardiograph detection circuit inductive reactance adjusting circuit and electrocardiograph detection equipment |
| CN104757962B (en) * | 2015-04-13 | 2018-05-08 | 深圳市飞马与星月科技研究有限公司 | The induction reactance of ECG detecting circuit adjusts circuit and ECG detecting equipment |
| CN111487955A (en) * | 2020-04-28 | 2020-08-04 | 北华航天工业学院 | A kind of unmanned aerial vehicle signal enhancement device and its enhancement method |
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