A control circuit for fetal heart simulation

Abstract

The application relates to the technical field of fetal heart simulation, in particular to a control circuit for fetal heart simulation, which comprises a control signal module, an amplitude adjustment module and a motor driving module; the control signal module is used for sending an amplitude adjustment signal and a motor driving signal; the amplitude adjustment module comprises an electromagnetic coil and is used for adjusting the magnetic force size and direction generated by the electromagnetic coil according to the amplitude adjustment signal, so as to simulate the heartbeat strength of a fetal heart; the motor driving module comprises a motor and is used for controlling the motor driving according to the motor driving signal, controlling the displacement of the simulated fetal heart, and simulating the distance change between the fetal heart and an ultrasonic probe; the application can realize the beneficial effects of simulating the strength of the fetal heart beating and the distance between the fetal heart and the ultrasonic probe.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fetal heart simulation, and particularly to a control circuit for fetal heart simulation. BACKGROUND

[0002] The artificial fetal heart simulator is a special device, and its working principle is to artificially design a device for simulating the beating of a fetal heart. In the research and development design process of the Doppler ultrasound fetal heart rate detection probe, on-site clinical testing of the fetus of a pregnant woman, data tracking, system debugging, etc. are required, and the test needs to be completed in the obstetrics and gynecology department of a hospital, which brings great difficulty to the design, debugging and testing of the engineering product.

[0003] At present, the fetal heart simulator on the market can only set fixed heart rate values (such as 30, 60, 90, 120, 150, 180, 210, and 240 bpm), and only fixed heart rate values cannot completely simulate the fetal heart rate fluctuation range. The vibration amplitude of the vibrator cannot be adjusted, the strength of the fetal heart beating cannot be simulated, the distance between the vibrator and the measured ultrasound probe is fixed, and the distance between the fetal heart and the ultrasound probe cannot be simulated.

[0004] Therefore, how to simulate the strength of the fetal heart beating and the distance between the fetal heart and the ultrasound probe is a technical problem to be solved. SUMMARY

[0005] The embodiment of the present application provides a control circuit for fetal heart simulation, which can realize the beneficial effects of simulating the strength of the fetal heart beating and the distance between the fetal heart and the ultrasound probe.

[0006] The present application provides a control circuit for fetal heart simulation: the circuit includes a control signal module, an amplitude adjustment module and a motor driving module;

[0007] The control signal module is used to send amplitude adjustment signals and motor driving signals;

[0008] The amplitude adjustment module includes an electromagnetic coil, which is used to adjust the magnetic force size and direction generated by the electromagnetic coil according to the amplitude adjustment signal, so as to simulate the strength of the fetal heart beating;

[0009] The motor driving module includes a motor, which is used to control the motor driving according to the motor driving signal, control the displacement of the simulated fetal heart, and simulate the distance change between the fetal heart and the ultrasound probe;

[0010] The control signal module includes a first amplitude modulation signal end, a second amplitude modulation signal end, a first driving signal end and a second driving signal end;

[0011] The amplitude adjustment module comprises a first amplitude modulation unit and a second amplitude modulation unit, the first amplitude modulation unit comprises a first amplitude modulation input end and a second amplitude modulation input end, and the second amplitude modulation unit comprises a third amplitude modulation input end and a fourth amplitude modulation input end;

[0012] The first amplitude modulation input end and the second amplitude modulation input end are connected to the first amplitude modulation signal end, and are used for controlling the first magnetic force direction borne by the simulated fetal heart according to the amplitude adjustment signal;

[0013] The third amplitude modulation input end and the fourth amplitude modulation input end are connected to the second amplitude modulation signal end, and are used for controlling the second magnetic force direction borne by the simulated fetal heart according to the amplitude adjustment signal;

[0014] The motor driving module comprises a first driving unit and a second driving unit, the first driving unit comprises a first driving input end and a second driving input end, and the second driving unit comprises a third driving input end and a fourth driving input end;

[0015] The first driving input end and the second driving input end are connected to the first driving signal end, and are used for controlling the first displacement direction of the simulated fetal heart according to the motor driving signal;

[0016] The third driving input end and the fourth driving input end are connected to the second driving signal end, and are used for controlling the second displacement direction of the simulated fetal heart according to the motor driving signal.

[0017] By adopting the above technical scheme, the heart rate value setting of the simulated fetal heart is realized by using the control signal module, the amplitude adjustment signal and the motor driving signal are output according to the heart rate value setting, the current direction in the electromagnetic coil in the amplitude adjustment module can be adjusted by the amplitude adjustment signal, so that the magnetic force direction generated by the electromagnetic coil is adjusted, thereby adjusting the heartbeat strength of the simulated fetal heart; according to the motor driving signal, the power direction generated by the motor in the motor driving module is controlled, thereby adjusting the distance between the simulated fetal heart and the probe.

[0018] Optionally, the control signal module comprises a single-chip microcomputer, a first AND gate device and a second AND gate device;

[0019] The first pin of the single-chip microcomputer is connected to the first pin of the first AND gate device, and the second pin of the single-chip microcomputer is connected to the second pin of the first AND gate device;

[0020] The output pin of the first AND gate device is connected to the first amplitude modulation input end and the second amplitude modulation input end;

[0021] The third pin of the single-chip microcomputer is connected to the first pin of the second AND gate device, and the fourth pin of the single-chip microcomputer is connected to the second pin of the second AND gate device;

[0022] The output pin of the second AND gate device is connected with the third amplitude modulation input end and the fourth amplitude modulation input end;

[0023] The fifth pin of the single-chip microcomputer is connected with the first drive input end and the second drive input end;

[0024] The sixth pin of the single-chip microcomputer is connected with the third drive input end and the fourth drive input end.

[0025] By adopting the above technical scheme, the heart rate control signal and the analog fetal heart amplitude control signal sent by the single-chip microcomputer are subjected to AND gate logic calculation through the AND gate device to form an amplitude adjustment signal; meanwhile, the single-chip microcomputer also sends a high-low level signal of a motor drive signal to control the driving direction of the motor.

[0026] Optionally, the first amplitude modulation unit comprises a first triode, a second triode, a third triode and a fourth triode.

[0027] The base of the first triode is connected with the output pin of the first AND gate device, the emitter of the first triode is grounded, and the collector of the first triode is connected with the base of the second triode and an external direct current signal source;

[0028] The emitter of the second triode is connected with the direct current signal source, and the collector of the second triode is connected with one end of the electromagnetic coil; the other end of the electromagnetic coil is connected with the collectors of the third triode and the fourth triode;

[0029] The emitter of the third triode is grounded, and the emitter of the fourth triode is connected with the base of the third triode, the base of the fourth triode and the output pin of the first AND gate device.

[0030] By adopting the above technical scheme, the first amplitude unit receives the amplitude adjustment signal from the first AND gate device; when a high level is received, the first triode is turned on to turn on the second triode, the fourth triode is turned on to turn on the third triode, and the electromagnetic coil current flows from one end to the other end to form a magnetic force in one direction.

[0031] Optionally, the first amplitude modulation unit further comprises a first freewheeling diode and a second freewheeling diode.

[0032] The anode of the first freewheeling diode is connected with the collector of the second triode, and the cathode of the first freewheeling diode is connected with the emitter of the second triode;

[0033] The anode of the second freewheeling diode is connected with the emitter of the third triode, and the cathode of the second freewheeling diode is connected with the collector of the third triode.

[0034] By adopting the technical scheme, the first freewheeling diode protects the second triode, and the second freewheeling diode protects the third triode, thereby playing a freewheeling role when being turned off, and protecting the corresponding triode from being damaged.

[0035] Optionally, the second amplitude modulation unit comprises a fifth triode, a sixth triode, a seventh triode and an eighth triode.

[0036] The base of the fifth triode is connected to the output pin of the second AND device, the emitter of the fifth triode is grounded, and the collector of the fifth triode is connected to the base of the sixth triode and the direct current signal source.

[0037] The emitter of the sixth triode is connected to the direct current signal source, and the collector of the sixth triode is connected to the other end of the electromagnetic coil, one end of the electromagnetic coil being connected to the collectors of the seventh triode and the eighth triode.

[0038] The emitter of the seventh triode is grounded, and the emitter of the eighth triode is connected to the base of the seventh triode, the base of the eighth triode and the output pin of the second AND device.

[0039] By adopting the technical scheme, the second amplitude unit receives the amplitude adjustment signal from the second AND device, when receiving a high level, the fifth triode is turned on to turn on the sixth triode, the eighth triode is turned on to turn on the seventh triode, and the electromagnetic coil current flows from the other end to one end, thereby forming a magnetic force in another direction.

[0040] Optionally, the second amplitude modulation unit further comprises a third freewheeling diode and a fourth freewheeling diode.

[0041] The positive electrode of the third freewheeling diode is connected to the collector of the sixth triode, and the negative electrode of the third freewheeling diode is connected to the emitter of the sixth triode.

[0042] The positive electrode of the fourth freewheeling diode is connected to the emitter of the seventh triode, and the negative electrode of the fourth freewheeling diode is connected to the collector of the seventh triode.

[0043] By adopting the technical scheme, the third freewheeling diode protects the sixth triode, and the fourth freewheeling diode protects the seventh triode, thereby playing a freewheeling role when being turned off, and protecting the corresponding triode from being damaged.

[0044] Optionally, the first driving unit comprises a ninth triode, a thirteenth triode, an eleventh triode and a twelfth triode.

[0045] The base of the ninth triode is connected to the fifth pin of the single-chip microcomputer, the emitter of the ninth triode is grounded, and the collector of the ninth triode is connected to the base of the thirteenth triode and the direct current signal source.

[0046] the emitter of the thirteenth transistor is connected to the direct current signal source, the collector of the thirteenth transistor is connected to one end of the motor, the other end of the motor is connected to the collector of the eleventh transistor and the twelfth transistor;

[0047] the emitter of the eleventh transistor is grounded, the emitter of the twelfth transistor is connected to the base of the eleventh transistor, the base of the twelfth transistor and the fifth pin of the single-chip microcomputer.

[0048] By adopting the technical scheme, the first driving unit receives the motor driving signal from the single-chip microcomputer, when receiving a high level, the ninth transistor is turned on to turn on the thirteenth transistor, the twelfth transistor is turned on to turn on the eleventh transistor, the current direction in the motor flows from one end to the other end, and the motor rotates clockwise or counterclockwise, the rotating direction is opposite to the rotating direction of the motor.

[0049] Optionally, the first driving unit further comprises a fifth freewheeling diode and a sixth freewheeling diode.

[0050] the anode of the fifth freewheeling diode is connected to the collector of the thirteenth transistor, and the cathode of the fifth freewheeling diode is connected to the emitter of the thirteenth transistor.

[0051] the anode of the sixth freewheeling diode is connected to the emitter of the eleventh transistor, and the cathode of the sixth freewheeling diode is connected to the collector of the eleventh transistor.

[0052] By adopting the technical scheme, the fifth freewheeling diode protects the thirteenth transistor, and the sixth freewheeling diode protects the eleventh transistor, and the two freewheeling diodes play a freewheeling role when being turned off, and protect the corresponding transistors from being damaged.

[0053] Optionally, the second driving unit comprises a tenth transistor, a fourteenth transistor, a fifteenth transistor and a sixteenth transistor.

[0054] the base of the tenth transistor is connected to the sixth pin of the single-chip microcomputer, the emitter of the tenth transistor is grounded, and the collector of the tenth transistor is connected to the base of the fourteenth transistor and the direct current signal source.

[0055] the emitter of the fourteenth transistor is connected to the direct current signal source, the collector of the fourteenth transistor is connected to the other end of the motor, and one end of the motor is connected to the collector of the fifteenth transistor and the sixteenth transistor.

[0056] the emitter of the fifteenth transistor is grounded, and the emitter of the sixteenth transistor is connected to the base of the fifteenth transistor, the base of the sixteenth transistor and the sixth pin of the single-chip microcomputer.

[0057] By adopting the technical scheme, the first driving unit receives the motor driving signal from the single-chip microcomputer, when receiving a high level, the tenth three-electrode tube is turned on to turn on the fourteenth three-electrode tube, the sixteenth three-electrode tube is turned on to turn on the fifteenth three-electrode tube, the current direction in the motor flows from the other end to one end, and the motor rotates reversely or clockwise, the rotating direction is opposite to the rotating direction of the motor.

[0058] Optionally, the second driving unit further comprises a seventh freewheeling diode and an eighth freewheeling diode.

[0059] The anode of the seventh freewheeling diode is connected to the collector of the fourteenth three-electrode tube, and the cathode is connected to the emitter of the fourteenth three-electrode tube.

[0060] The anode of the eighth freewheeling diode is connected to the emitter of the fifteenth three-electrode tube, and the cathode is connected to the collector of the fifteenth three-electrode tube.

[0061] By adopting the technical scheme, the seventh freewheeling diode protects the fourteenth three-electrode tube, and the eighth freewheeling diode protects the fifteenth three-electrode tube, which plays a freewheeling role when being turned off, and protects the corresponding three-electrode tube from being damaged.

[0062] In summary, the present application has at least one of the following beneficial effects:

[0063] 1. The control signal module is used to set the heart rate value of the simulated fetal heart, the amplitude adjustment signal and the motor driving signal are output according to the heart rate value, the amplitude adjustment signal can adjust the current direction in the electromagnetic coil in the amplitude adjustment module, so as to adjust the magnetic force direction generated by the electromagnetic coil, thereby adjusting the heartbeat strength of the simulated fetal heart; according to the motor driving signal, the power direction generated by the motor in the motor driving module is controlled, thereby adjusting the distance between the simulated fetal heart and the probe. Through the above two aspects, the strength of the simulated fetal heart and the distance between the fetal heart and the ultrasonic probe are realized.

[0064] 2. Each unit is provided with a freewheeling diode, because in actual use, the three-electrode tube in the circuit needs to be turned on and turned off constantly, the freewheeling diode is arranged to form a freewheeling effect, which can avoid damage to the three-electrode tube when being turned on and turned off constantly, thereby improving the reliability of the circuit.

[0065] 3. The pulse width modulation signal is sent by the single-chip microcomputer for control, the heart rate value setting and the measurement range of the simulated fetal heart can be artificially changed, and the parameters can be adjusted according to the actual use demand. BRIEF DESCRIPTION OF DRAWINGS

[0066] Figure 1 is a module connection diagram of the control circuit for fetal heart simulation provided by the embodiment of the present application;

[0067] Figure 2is a circuit schematic diagram of a control circuit for fetal heart simulation provided by an embodiment of the present application;

[0068] Figure 3 is an output pulse signal diagram of a control circuit for fetal heart simulation provided by an embodiment of the present application. DETAILED DESCRIPTION

[0069] The following examples will facilitate further understanding of the role of the present application by those skilled in the art, but do not limit the present application in any form. It should be noted that for those skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can also be made. These all belong to the protection scope of the present application.

[0070] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the application. However, persons of ordinary skill in the art will appreciate that embodiments of the application can be practiced without the specific details, which are presented in the following description and accompanying drawings. In other instances, well-known systems, devices, circuits, and methods have not been described in detail so as not to unnecessarily obscure aspects of the application.

[0071] It should be understood that the term "comprising" as used in the specification and the appended claims indicates the presence of the recited features, integers, steps, operations, elements, and / or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0072] It should also be understood that the term "and / or" as used in the specification and the appended claims indicates any combination of one or more of the associated listed items and all possible combinations of the items.

[0073] As used in the specification and the appended claims, the term "if" can be interpreted as meaning "when" or "once" or "in response to a determination" or "in response to detecting" depending on the context. Similarly, the phrase "if determined" or "if detected [the described condition or event]" can be interpreted as meaning "once determined" or "in response to a determination" or "once detected [the described condition or event]" or "in response to detecting [the described condition or event]" depending on the context.

[0074] In addition, in the description of the present application and the appended claims, the terms "first", "second", "third", etc. are only used for differentiation in description and cannot be understood as indicating or implying relative importance.

[0075] Reference throughout this application to "one embodiment" or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. The appearances of the phrase "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment, however, but can refer to one or more but not all embodiments. The terms "including," "comprising," "carrying," "having," "containing," and variations thereof are meant to encompass the item listed thereafter, but do not exclude additional, unrecited items. The terms "a" or "an," as used herein in the disclosure, mean "one or more" unless otherwise indicated.

[0076] The application is further described in detail below with reference to the accompanying drawings.

[0077] With reference to Figure 1 The module connection diagram of the control circuit for fetal heart simulation provided by the embodiments of the application includes a control signal module 1, an amplitude adjustment module 2, and a motor driving module 3.

[0078] The control signal module 1 is configured to send amplitude adjustment signals and motor driving signals.

[0079] The amplitude adjustment module 2 includes an electromagnetic coil, which is configured to adjust the size and direction of the magnetic force generated by the electromagnetic coil according to the amplitude adjustment signals, so as to simulate the strength of the fetal heart.

[0080] The motor driving module 3 includes a motor, which is configured to control the driving of the motor according to the motor driving signals, so as to control the displacement of the simulated fetal heart, thereby simulating the change in the distance between the fetal heart and the ultrasonic probe.

[0081] The control signal module 1 includes a first amplitude modulation signal end, a second amplitude modulation signal end, a first driving signal end, and a second driving signal end.

[0082] Regarding the control signal module 1: The control signal module 1 includes a controller, which can be a microcontroller, including but not limited to a single-chip microcomputer (MCU). Taking the single-chip microcomputer as an example, the circuit receives the pulse width modulation signal sent by the single-chip microcomputer. The amplitude adjustment module 2 described below generates a magnetic force energy of the electromagnetic coil in the amplitude adjustment module 2 each time it receives an amplitude adjustment signal. Since the pulse width signal also forms two magnetic force directions, the average heart rate value of the fetal heart beating per minute is simulated. The motor driving signal controls the driving of the motor in the motor driving module 3 described below. According to the high and low level signals output by at least two pins of the single-chip microcomputer, the rotation direction of the motor is adjusted, so that the simulated fetal heart is displaced in different directions.

[0083] The amplitude adjustment module 2 includes a first amplitude modulation unit 21 and a second amplitude modulation unit 22, the first amplitude modulation unit 21 includes a first amplitude modulation input end and a second amplitude modulation input end, and the second amplitude modulation unit 22 includes a third amplitude modulation input end and a fourth amplitude modulation input end;

[0084] The first amplitude modulation input end and the second amplitude modulation input end are connected to the first amplitude modulation signal end, for controlling the first magnetic force direction of the analog fetal heart according to the amplitude adjustment signal;

[0085] The third amplitude modulation input end and the fourth amplitude modulation input end are connected to the second amplitude modulation signal end, for controlling the second magnetic force direction of the analog fetal heart according to the amplitude adjustment signal;

[0086] Regarding the amplitude adjustment module 2: the first amplitude modulation unit 21 and the second amplitude modulation unit 22 in the amplitude adjustment module 2 are connected at both ends of the electromagnetic coil, when the first amplitude modulation unit 21 is turned on, the second amplitude modulation unit 22 is turned off, the current direction of the electromagnetic coil flows from one end to the other end, and a magnetic force direction is formed according to the electromagnetism; the second amplitude modulation unit 22 is turned on, and the current direction of the electromagnetic coil flows from the other end to the one end, that is, the current direction is opposite to that when the first amplitude modulation unit 21 is turned on, and another magnetic force direction is formed according to the electromagnetism. The analog fetal heart is usually a magnetic force adjustable block, including but not limited to a solid iron ball, and the change of the magnetic force direction will affect the vibration of the analog fetal heart, so as to simulate the heart rate value of the fetal heart.

[0087] The motor driving module 3 includes a first driving unit 31 and a second driving unit 32, the first driving unit 31 includes a first driving input end and a second driving input end, and the second driving unit 32 includes a third driving input end and a fourth driving input end;

[0088] The first driving input end and the second driving input end are connected to the first driving signal end, for controlling the first displacement direction of the analog fetal heart according to the motor driving signal;

[0089] The third driving input end and the fourth driving input end are connected to the second driving signal end, for controlling the second displacement direction of the analog fetal heart according to the motor driving signal.

[0090] Regarding motor drive module 3: The first drive unit 31 and the second drive unit 32 in motor drive module 3 are connected to both ends of the motor. When the first drive unit 31 receives a high level from the microcontroller, it is turned on. At this time, the second drive unit 32 is turned off, and the current in the motor flows from one end to the other, causing the motor to rotate clockwise / counterclockwise. The direction of motor rotation is opposite to the direction of motor rotation when the second drive unit 32 is turned on, thereby controlling the simulated fetal heart to move in the first displacement direction. Similarly, when the second drive unit 32 receives a high level and is turned on, the motor rotates counterclockwise / clockwise, thereby controlling the simulated fetal heart to move in the second displacement direction. By simulating the movement of the fetal heart, the distance between the fetal heart and the ultrasound probe is simulated, meeting the needs of practical use.

[0091] Reference Figure 2 The diagram below shows the circuit schematic of the control circuit for fetal heart rate simulation provided in this application embodiment. The control signal module 1, amplitude adjustment module 2, and motor drive module 3 will be described in detail below with reference to the circuit schematic:

[0092] The control signal module 1 includes a microcontroller U1, a first AND gate device U2, and a second AND gate device U3;

[0093] The first pin of the microcontroller U1 is connected to the first pin of the first AND gate device U2, and the second pin of the microcontroller U1 is connected to the second pin of the first AND gate device U2.

[0094] The output pin of the first AND gate device U2 is connected to the first amplitude modulation input terminal and the second amplitude modulation input terminal;

[0095] The third pin of the microcontroller U1 is connected to the first pin of the second AND gate device, and the fourth pin of the microcontroller is connected to the second pin of the second AND gate device U3.

[0096] The output pin of the second AND gate device U3 is connected to the third amplitude modulation input terminal and the fourth amplitude modulation input terminal;

[0097] The fifth pin of the microcontroller U1 is connected to the first drive input terminal and the second drive input terminal;

[0098] The sixth pin of the microcontroller U1 is connected to the third drive input terminal and the fourth drive input terminal.

[0099] Specifically, the first and second AND gate devices can be AND gate circuit chips that can perform AND gate logic calculation, U1 can output high and low level signals to U2 and U3, and only when the inputs of the first and second amplitude modulation input ends of U2 are both high level signals, the output pin of U2 will output a high level to the first amplitude modulation unit 21; U3 is the same, and only when the third and fourth amplitude modulation input ends are both high level signals, the output pin of U3 will output a high level to the second amplitude modulation unit 22.

[0100] Reference Figure 3 The output pulse signal diagram provided by the embodiment of the application, A pulse is a heart rate value control signal input by the first or third amplitude modulation input end, W1 is a pulse width with a fixed value, which can be 150 milliseconds, W2 is a pulse interval, the smaller the interval, the higher the pulse frequency, and the faster the simulation of fetal heart movement (similar to faster heartbeats), the larger the W2 interval, the smaller the frequency, and the slower the simulation of fetal heart movement;

[0101] B pulse is a movement amplitude control signal input by the second or fourth amplitude modulation input end, a PWM pulse width modulation signal is used, the higher the PWM duty cycle, the larger the coil current, and the larger the simulation of fetal heart vibration amplitude, and vice versa, the smaller the PWM duty cycle, the smaller the simulation of fetal heart vibration amplitude;

[0102] C pulse is the logic AND calculation result of A pulse and B pulse, that is, the output signal of U2 or U3.

[0103] More specifically, the fifth pin of the single-chip microcomputer U1 is connected to the first driving unit 31, and the sixth pin is connected to the second driving unit 32, and U1 can adjust the output high and low levels to the corresponding driving units through the connection relationship.

[0104] The circuit principle will be described in detail below in combination with the current limiting resistor and the pull-up and pull-down resistors:

[0105] The first amplitude modulation unit 21 comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a first triode Q1, a second triode Q2, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, a third triode Q3 and a fourth triode Q4.

[0106] One end of the first resistor R1 is connected to the output pin of the first AND gate device U2, and the other end is connected to the base of the first triode Q1 and one end of the second resistor R2, and the other end of the second resistor R2 and the emitter of the first triode Q1 are grounded.

[0107] The collector of the first transistor Q1 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to one end of the fourth resistor R4 and the base of the second transistor Q2, the emitter of the second transistor Q2 and the other end of the fourth resistor R4 are connected to an external DC signal source VCC;

[0108] The collector of the second transistor Q2 is connected to one end of the electromagnetic coil, the other end of the electromagnetic coil is connected to the collector of the third transistor Q3 and the collector of the fourth transistor Q4;

[0109] The emitter of the third transistor Q3 is grounded, the base is connected to the emitter of the fourth transistor Q4 and one end of the fifth resistor R5, the other end of the fifth resistor R5 is grounded;

[0110] The emitter of the fourth transistor Q4 is also connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the base of the fourth transistor Q4 and one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to the output pin of the first AND device U2.

[0111] Specifically, R1 is a current limiting resistor for voltage division and current limiting of the electrical signal; R2 is a pull-down resistor for ensuring that the base of Q1 is at a low level in the normal state, since Q1 is an NPN transistor, it is in the off state in the normal state; R3 is a current limiting resistor; R4 is a pull-up resistor for ensuring that the base of Q2 is at a high level in the normal state, since Q2 is a PNP transistor, it is in the off state in the normal state; R5 and R6 are pull-down resistors for setting the bases of Q3 and Q4 to a low level in the normal state; and R7 is a current limiting resistor.

[0112] More specifically, when the first amplitude modulation unit 21 receives the high level signal output by U2, the high level signal is output to the base of Q1 through R1, thereby turning on Q1, after Q1 is turned on, the level signal output by VCC is output to the ground through Q1, the base voltage of Q2 is pulled down, Q2 is turned on, and the role of Q1 is to maximize the conduction current of Q2, that is, to improve the driving capability of Q2; at the same time, the high level signal is output to the bases of Q3 and Q4 through R7, after Q4 is turned on, it will further open the body diode of Q3, so that Q3 is completely opened and the conduction current reaches the maximum value, that is, the driving capability of Q3 is improved. In this case, the electromagnetic coil is turned on by the positive to negative circuit, according to the principle of electromagnetism, a magnetic force in the upward direction is generated, and the positive, negative and electromagnetic directions are for explanation and illustration only, and can be adjusted according to actual use.

[0113] The first amplitude modulation unit 21 further comprises a first freewheeling diode D1 and a second freewheeling diode D2;

[0114] The positive electrode of the first freewheeling diode D1 is connected to the collector of the second triode Q2, and the negative electrode is connected to the emitter of the second triode Q2;

[0115] The positive electrode of the second freewheeling diode D2 is connected to the emitter of the third triode Q3, and the negative electrode is connected to the collector of the third triode Q3.

[0116] Specifically, the freewheeling diode is connected in parallel across the device to be protected, and when the voltage across the protected device changes abruptly, a freewheeling path is provided to avoid damage to the device caused by voltage surges.

[0117] The following second amplitude modulation unit 22, first drive unit 31 and second drive unit 32 are connected and act on the current limiting resistor, pull-up and pull-down resistor, and the circuit principle of the above-mentioned first amplitude modulation unit 21 is the same as the above-mentioned circuit principle, which can be understood by referring to the above-mentioned circuit principle, therefore not to repeat.

[0118] The second amplitude modulation unit 22 is described in detail below, which includes a fifth triode Q5, a sixth triode Q6, a seventh triode Q7 and an eighth triode Q8;

[0119] The base of the fifth triode Q5 is connected to the output pin of the second AND device U3, the emitter of the fifth triode Q5 is grounded, and the collector of the fifth triode Q5 is connected to the base of the sixth triode Q6 and the DC signal source VCC;

[0120] The emitter of the sixth triode Q6 is connected to the DC signal source VCC, and the collector is connected to the other end of the electromagnetic coil, one end of the electromagnetic coil is connected to the collectors of the seventh triode Q7 and the eighth triode Q8;

[0121] The emitter of the seventh triode Q7 is grounded, and the emitter of the eighth triode Q8 is connected to the base of the seventh triode Q7, the base of the eighth triode Q8 and the output pin of the second AND device U3.

[0122] Specifically, the circuit principle is similar to the above-mentioned first amplitude modulation unit 21, Q5 is used to maximize the driving capability of Q6, and Q8 is used to maximize the driving capability of Q7. When U3 outputs a high level, the current direction in the electromagnetic coil is opposite to that when the above-mentioned first amplitude modulation unit 21 is turned on, and according to the principle of electricity generating magnetism, another direction of magnetic force is generated.

[0123] The second amplitude modulation unit 22 further comprises a third freewheeling diode D3 and a fourth freewheeling diode D4;

[0124] The positive electrode of the third freewheeling diode D3 is connected to the collector of the sixth transistor Q6, and the negative electrode is connected to the emitter of the sixth transistor Q6.

[0125] The positive electrode of the fourth freewheeling diode D4 is connected to the emitter of the seventh transistor Q7, and the negative electrode is connected to the collector of the seventh transistor Q7.

[0126] Specifically, D3 provides freewheeling protection for both ends of Q6 to prevent damage caused by sudden changes in voltage across Q6; D4 provides freewheeling protection for both ends of Q7 to prevent damage caused by sudden changes in voltage across Q7.

[0127] The first drive unit 31 includes a ninth transistor Q9, a thirteenth transistor Q10, an eleventh transistor Q11, and a twelfth transistor Q12.

[0128] The base of the ninth transistor Q9 is connected to the fifth pin of the single-chip microcomputer U1, the emitter of the ninth transistor Q9 is grounded, and the collector of the ninth transistor Q9 is connected to the base of the thirteenth transistor Q13 and the direct current signal source VCC.

[0129] The emitter of the thirteenth transistor Q10 is connected to the direct current signal source VCC, and the collector is connected to one end of the motor. The other end of the motor is connected to the collectors of the eleventh transistor Q11 and the twelfth transistor Q12.

[0130] The emitter of the eleventh transistor Q11 is grounded, and the emitter of the twelfth transistor Q12 is connected to the base of the eleventh transistor Q11, the base of the twelfth transistor Q12, and the fifth pin of the single-chip microcomputer U1.

[0131] Specifically, Q9 is turned on when it receives a high-level signal output by the fifth pin of U1. After Q9 is turned on, Q10 is also turned on. Meanwhile, the high-level signal output by U1 turns on Q12 and Q11, forming a path for the current in the motor. The motor rotates according to the direction of the current. In this embodiment, taking the clockwise direction as an example, the clockwise rotating motor drives the simulated fetal heart to move upwards. The upward movement is only for illustration, and in fact, the direction of movement can be adjusted according to actual needs. When the simulated fetal heart moves upwards, it can be used to simulate the situation where the distance between the fetal heart and the probe increases.

[0132] The first drive unit 31 further includes a fifth freewheeling diode D5 and a sixth freewheeling diode D6.

[0133] The positive electrode of the fifth freewheeling diode D5 is connected to the collector of the thirteenth transistor Q10, and the negative electrode is connected to the emitter of the thirteenth transistor.

[0134] The anode of the sixth freewheeling diode D6 is connected to the emitter of the eleventh triode Q11, and the cathode is connected to the collector of the eleventh triode Q11.

[0135] Specifically, D5 provides a freewheeling circuit for Q10, and D6 provides a freewheeling circuit for Q11, avoiding damage to Q10 and Q11 due to voltage surges when turning on or off.

[0136] The second driving unit 32 is specifically described below, which includes a tenth triode Q13, a fourteenth triode Q14, a fifteenth triode Q15, and a sixteenth triode Q16.

[0137] The base of the tenth triode Q13 is connected to the sixth pin of the single-chip microcomputer U1, the emitter is grounded, and the collector is connected to the base of the fourteenth triode Q14 and the DC signal source VCC.

[0138] The emitter of the fourteenth triode Q14 is connected to the DC signal source VCC, and the collector is connected to the other end of the motor, and one end of the motor is connected to the collectors of the fifteenth triode Q15 and the sixteenth triode Q16.

[0139] The emitter of the fifteenth triode Q15 is grounded, and the emitter of the sixteenth triode Q16 is connected to the base of the fifteenth triode Q15, the base of the sixteenth triode Q16, and the sixth pin of the single-chip microcomputer U1.

[0140] Specifically, the circuit principle can be understood with reference to the first driving unit 31 described above. In the embodiment of the application, the counterclockwise rotating motor drives the simulated fetal heart to move downward. The downward movement is because it corresponds to the upward movement described above, and is only used for illustration. The actual direction of movement can be adjusted according to actual needs. When the simulated fetal heart moves downward, it can be used to simulate the situation that the distance between the fetal heart and the probe decreases.

[0141] The second driving unit 32 further includes a seventh freewheeling diode D7 and an eighth freewheeling diode D8.

[0142] The anode of the seventh freewheeling diode D7 is connected to the collector of the fourteenth triode Q14, and the cathode is connected to the emitter of the fourteenth triode Q14.

[0143] The anode of the eighth freewheeling diode D8 is connected to the emitter of the fifteenth triode Q15, and the cathode is connected to the collector of the fifteenth triode Q15.

[0144] Specifically, D7 provides a freewheeling circuit for Q14, and D8 provides a freewheeling circuit for Q15, avoiding damage of Q14 and Q15 caused by voltage mutation due to turn-on or turn-off.

[0145] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0146] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A control circuit for fetal heart simulation, characterized by: The circuit comprises a control signal module, an amplitude adjustment module and a motor driving module; The control signal module is configured to send an amplitude adjustment signal and a motor driving signal; The amplitude adjustment module comprises an electromagnetic coil, configured to adjust the magnetic force generated by the electromagnetic coil according to the amplitude adjustment signal, so as to simulate the strength of the fetal heart; The motor driving module comprises a motor, configured to control the motor driving according to the motor driving signal, control the displacement of the simulated fetal heart, and simulate the distance change between the fetal heart and the ultrasonic probe; The control signal module comprises a first amplitude modulation signal end, a second amplitude modulation signal end, a first driving signal end and a second driving signal end; The amplitude adjustment module comprises a first amplitude modulation unit and a second amplitude modulation unit, the first amplitude modulation unit comprises a first amplitude modulation input end and a second amplitude modulation input end, and the second amplitude modulation unit comprises a third amplitude modulation input end and a fourth amplitude modulation input end; The first amplitude modulation input end and the second amplitude modulation input end are connected to the first amplitude modulation signal end, and are configured to control the first magnetic force direction acting on the simulated fetal heart according to the amplitude adjustment signal; The third amplitude modulation input end and the fourth amplitude modulation input end are connected to the second amplitude modulation signal end, and are configured to control the second magnetic force direction acting on the simulated fetal heart according to the amplitude adjustment signal; The motor driving module comprises a first driving unit and a second driving unit, the first driving unit comprises a first driving input end and a second driving input end, and the second driving unit comprises a third driving input end and a fourth driving input end; The first driving input end and the second driving input end are connected to the first driving signal end, and are configured to control the first displacement direction of the simulated fetal heart according to the motor driving signal; The third driving input end and the fourth driving input end are connected to the second driving signal end, and are configured to control the second displacement direction of the simulated fetal heart according to the motor driving signal.

2. The control circuit for fetal heart simulation according to claim 1, characterized in that: The control signal module comprises a single-chip microcomputer, a first AND gate device and a second AND gate device; A first pin of the single-chip microcomputer is connected to a first pin of the first AND gate device, and a second pin of the single-chip microcomputer is connected to a second pin of the first AND gate device; An output pin of the first AND gate device is connected to the first amplitude modulation input end and the second amplitude modulation input end; A third pin of the single-chip microcomputer is connected to a first pin of the second AND gate device, and a fourth pin of the single-chip microcomputer is connected to a second pin of the second AND gate device; An output pin of the second AND gate device is connected to the third amplitude modulation input end and the fourth amplitude modulation input end; A fifth pin of the single-chip microcomputer is connected to the first driving input end and the second driving input end; A sixth pin of the single-chip microcomputer is connected to the third driving input end and the fourth driving input end.

3. The control circuit for fetal heart simulation according to claim 2, characterized in that: The first amplitude modulation unit comprises a first triode, a second triode, a third triode and a fourth triode; A base of the first triode is connected to the output pin of the first AND gate device, an emitter of the first triode is grounded, and a collector of the first triode is connected to a base of the second triode and an external direct-current signal source; The emitter of the second triode is connected with the direct current signal source, and the collector is connected with one end of the electromagnetic coil; the other end of the electromagnetic coil is connected with the collectors of the third triode and the fourth triode; The emitter of the third triode is grounded, and the emitter of the fourth triode is connected with the base of the third triode, the base of the fourth triode and the output pin of the first AND device.

4. The control circuit for fetal heart simulation according to claim 3, characterized in that: The first amplitude modulation unit further comprises a first freewheeling diode and a second freewheeling diode; The positive electrode of the first freewheeling diode is connected with the collector of the second triode, and the negative electrode is connected with the emitter of the second triode; The positive electrode of the second freewheeling diode is connected with the emitter of the third triode, and the negative electrode is connected with the collector of the third triode.

5. The control circuit for fetal heart simulation according to claim 3, wherein: The second amplitude modulation unit comprises a fifth triode, a sixth triode, a seventh triode and an eighth triode; The base of the fifth triode is connected with the output pin of the second AND device, the emitter of the fifth triode is grounded, and the collector is connected with the base of the sixth triode and the direct current signal source; The emitter of the sixth triode is connected with the direct current signal source, and the collector is connected with the other end of the electromagnetic coil; one end of the electromagnetic coil is connected with the collectors of the seventh triode and the eighth triode; The emitter of the seventh triode is grounded, and the emitter of the eighth triode is connected with the base of the seventh triode, the base of the eighth triode and the output pin of the second AND device.

6. The control circuit for fetal heart simulation according to claim 5, characterized in that: The second amplitude modulation unit further comprises a third freewheeling diode and a fourth freewheeling diode; The positive electrode of the third freewheeling diode is connected with the collector of the sixth triode, and the negative electrode is connected with the emitter of the sixth triode; The positive electrode of the fourth freewheeling diode is connected with the emitter of the seventh triode, and the negative electrode is connected with the collector of the seventh triode.

7. The control circuit for fetal heart simulation according to claim 5, wherein: The first driving unit comprises a ninth triode, a thirteenth triode, an eleventh triode and a twelfth triode; The base of the ninth triode is connected with the fifth pin of the single-chip microcomputer, the emitter of the ninth triode is grounded, and the collector is connected with the base of the thirteenth triode and the direct current signal source; The emitter of the thirteenth triode is connected with the direct current signal source, and the collector is connected with one end of the motor; the other end of the motor is connected with the collectors of the eleventh triode and the twelfth triode; The emitter of the eleventh triode is grounded, and the emitter of the twelfth triode is connected with the base of the eleventh triode, the base of the twelfth triode and the fifth pin of the single-chip microcomputer.

8. The control circuit for fetal heart simulation according to claim 7, characterized in that: The first driving unit further comprises a fifth freewheeling diode and a sixth freewheeling diode; The positive electrode of the fifth freewheeling diode is connected with the collector of the thirteenth triode, and the negative electrode is connected with the emitter of the thirteenth triode; The positive electrode of the sixth freewheeling diode is connected with the emitter of the eleventh triode, and the negative electrode is connected with the collector of the eleventh triode.

9. The control circuit for fetal heart simulation according to claim 7, wherein: The second driving unit comprises a tenth triode, a fourteenth triode, a fifteenth triode and a sixteenth triode; The base of the tenth three-electrode tube is connected with the sixth pin of the single-chip microcomputer, the emitter of the tenth three-electrode tube is grounded, and the collector of the tenth three-electrode tube is connected with the base of the fourteenth three-electrode tube and the direct current signal source; The emitter of the fourteenth three-electrode tube is connected with the direct current signal source, and the collector of the fourteenth three-electrode tube is connected with the other end of the motor, one end of the motor being connected with the collectors of the fifteenth three-electrode tube and the sixteenth three-electrode tube; The emitter of the fifteenth three-electrode tube is grounded, and the emitter of the sixteenth three-electrode tube is connected with the base of the fifteenth three-electrode tube, the base of the sixteenth three-electrode tube and the sixth pin of the single-chip microcomputer.

10. The control circuit for fetal heart simulation according to claim 9, characterized in that: The second driving unit further comprises a seventh freewheeling diode and an eighth freewheeling diode; The positive electrode of the seventh freewheeling diode is connected with the collector of the fourteenth three-electrode tube, and the negative electrode of the seventh freewheeling diode is connected with the emitter of the fourteenth three-electrode tube; The positive electrode of the eighth freewheeling diode is connected with the emitter of the fifteenth three-electrode tube, and the negative electrode of the eighth freewheeling diode is connected with the collector of the fifteenth three-electrode tube.

Images