Blood oxygen simulation device based on multi-path optical device feedback regulation circuit

Abstract

The utility model provides a blood oxygen simulation device based on a multipath light device feedback regulation circuit, which belongs to the technical field of electronic control and comprises a light-emitting driving module, a feedback regulation module and a light-emitting tube. The feedback adjustment module comprises a first feedback adjustment sub-module and a second feedback adjustment sub-module; the light-emitting driving module is electrically connected to the first end of the light-emitting tube and is used for collecting a light signal emitted by the to-be-tested equipment and driving the light-emitting tube to emit light; one end of the first feedback adjustment sub-module is electrically connected to one end of the second feedback adjustment sub-module; the first feedback regulation sub-module is used for carrying out feedback regulation on the light-emitting tube according to the light-emitting intensity of the light-emitting tube; and the second feedback regulation sub-module is used for carrying out feedback regulation on the light-emitting tube according to the intensity of the current flowing through the light-emitting tube. According to the utility model, through multi-dimensional feedback adjustment, the light intensity and the current intensity of the light-emitting tube are controlled, and the precision and the stability of the device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic control, in particular to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit. Background Art

[0002] With the widespread adoption of pulse oximeters in health monitoring, accurate detection of blood oxygen concentration and pulse signals is crucial to device effectiveness. During the development and calibration of oximeters, simulation devices are often required to simulate the oximeter's operating environment in order to test the device's performance under different conditions. The core task of a pulse oximeter simulator is to simulate the oximeter's optical behavior under varying pulse and blood oxygen concentrations, particularly the light signal emitted by the light-emitting diode (LED), which directly impacts the detection accuracy and stability of the device under test.

[0003] Traditional blood oxygen simulation devices typically use a simple drive circuit to control the light-emitting diode (LED). However, due to the lack of a precise feedback regulation mechanism, the LED's luminous intensity and current are easily affected by external environmental changes or circuit fluctuations, resulting in optical signal instability. For example, changes in ambient temperature, unstable power supply voltage, or the nonlinear characteristics of the device itself can cause deviations in the LED's output light intensity, thereby affecting the simulation accuracy of the device.

[0004] Therefore, how to accurately control the light intensity of the light-emitting tube in the oximeter simulation device to ensure the stability of the optical signal and the simulation accuracy during the simulation process has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The utility model provides a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit, which is used to solve the defects in the prior art and realize the precise control of the light intensity of the light emitting tube in the oximeter simulation device to ensure the stability of the light signal and the simulation accuracy during the simulation process.

[0006] The utility model provides a blood oxygen simulation device based on a multi-path light device feedback regulation circuit, comprising: a light driving module, a feedback regulation module and a light emitting tube; the feedback regulation module comprises a first feedback regulation submodule and a second feedback regulation submodule;

[0007] The light driving module is electrically connected to the first end of the light emitting diode, and is used to collect the light signal emitted by the device to be tested and drive the light emitting diode to emit light;

[0008] One end of the first feedback regulation submodule is electrically connected to one end of the second feedback regulation submodule;

[0009] The first feedback regulation submodule is configured to perform feedback regulation on the light emitting tube according to the light emitting intensity of the light emitting tube;

[0010] The second feedback regulation submodule is used to perform feedback regulation on the light emitting tube according to the intensity of the current flowing through the light emitting tube.

[0011] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the first feedback regulation submodule includes: a first silicon photocell PC1, a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a second resistor R2 and a third resistor R3;

[0012] The inverting input terminal of the first operational amplifier U1 is electrically connected to one end of the first resistor R1 and the output terminal of the first silicon photocell PC1 at the same time;

[0013] The other end of the first resistor R1 and the non-inverting input end of the second operational amplifier U2 are both electrically connected to the output end of the first operational amplifier U1;

[0014] One end of the second resistor R2 is electrically connected to the inverting input terminal of the second operational amplifier U2, and the other end of the second resistor R2 is electrically connected to the output terminal of the second operational amplifier U2;

[0015] One end of the third resistor R3 is electrically connected to the output end of the second operational amplifier U2.

[0016] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the second feedback regulation submodule includes: a voltage input unit, a second operational amplifier U2, a third operational amplifier U3, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1;

[0017] One end of the second resistor R2 is electrically connected to the inverting input terminal of the second operational amplifier U2, and the other end of the second resistor R2 is electrically connected to the output terminal of the second operational amplifier U2;

[0018] One end of the third resistor R3 is electrically connected to the output end of the second operational amplifier U2;

[0019] One end of the fourth resistor R4 is electrically connected to the voltage input unit, and the other end of the fourth resistor R4 is electrically connected to the inverting input terminal of the third operational amplifier U3 and one end of the first capacitor C1. At the same time, the fourth resistor R4 is electrically connected to the output terminal of the third operational amplifier U3 through the first capacitor C1.

[0020] One end of the sixth resistor R6 is electrically connected to the output end of the third operational amplifier U3;

[0021] One end of the fifth resistor R5 is electrically connected to the other end of the sixth resistor R6 and the inverting input end of the second operational amplifier U2.

[0022] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the feedback regulation module further comprises: a light emitting diode drive control submodule and a current control submodule;

[0023] One end of the light-emitting diode drive control submodule is electrically connected to the output end of the first feedback regulation submodule and the output end of the second feedback regulation submodule, and the other end of the light-emitting diode drive control submodule is electrically connected to the input end of the current control submodule;

[0024] The output end of the current control submodule is electrically connected to the negative feedback end of the second feedback regulation submodule.

[0025] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the light-emitting diode drive control submodule includes a fourth operational amplifier U4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q1, a second capacitor C2, a light-emitting diode drive signal terminal, and a control signal unit;

[0026] One end of the seventh resistor R7 is electrically connected to the non-inverting input terminal of the fourth operational amplifier U4, one end of the ninth resistor R9 and the collector of the first transistor Q1, and the other end of the seventh resistor R7 is electrically connected to the light-emitting diode drive signal terminal;

[0027] One end of the eighth resistor R8 is electrically connected to the inverting input terminal of the fourth operational amplifier U4, and the other end of the eighth resistor R8 is electrically connected to one end of the second capacitor C2;

[0028] The output end of the fourth operational amplifier U4 is electrically connected to the input end of the current control submodule and the other end of the second capacitor C2 at the same time;

[0029] The emitter of the first transistor Q1 is electrically connected to the other end of the ninth resistor R9;

[0030] The control signal unit is electrically connected to the base of the first transistor Q1 and is used to control the conduction state of the first transistor Q1.

[0031] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the current control submodule includes a second transistor Q2, a third transistor Q3, a tenth resistor R10, an eleventh resistor R11, a first diode D1 and a control signal unit;

[0032] The base of the second transistor Q2 is electrically connected to the other end of the light-emitting diode drive control submodule, the collector of the second transistor Q2 is electrically connected to the cathode of the light-emitting diode, and the emitter of the second transistor Q2 is electrically connected to one end of the tenth resistor R10 and the collector of the third transistor Q3.

[0033] The other end of the tenth resistor R10 is electrically connected to the anode of the first diode D1;

[0034] The cathode of the first diode D1 is electrically connected to the base of the third transistor Q3 through the control signal unit;

[0035] The control signal unit is used to control the conduction state of the third transistor Q3;

[0036] The emitter of the third transistor Q3 is electrically connected to the negative feedback terminal of the second feedback regulation submodule through the eleventh resistor.

[0037] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the voltage input unit includes: a digital-to-analog converter, a twelfth resistor R12, a thirteenth resistor R13, and a fifth operational amplifier U5;

[0038] The output end of the digital-to-analog converter is electrically connected to one end of the twelfth resistor R12;

[0039] The other end of the twelfth resistor R12 and one end of the thirteenth resistor R13 are both electrically connected to the inverting input terminal of the fifth operational amplifier U5;

[0040] The other end of the thirteenth resistor R13 is electrically connected to the output end of the fifth operational amplifier U5;

[0041] An output terminal of the fifth operational amplifier U5 is electrically connected to one end of the fourth resistor R4 .

[0042] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the control signal unit includes an optical signal acquisition and amplification subunit and a signal comparison and output subunit;

[0043] One end of the optical signal collection and amplification subunit is electrically connected to one end of the signal comparison and output subunit, and is used to collect the optical signal of the light-emitting tube and convert it into an electrical signal, amplify the electrical signal, and output the amplified electrical signal to the signal comparison and output subunit;

[0044] The signal comparison and output subunit is used to compare the amplified electrical signal with a preset reference voltage to generate an output signal.

[0045] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the optical signal acquisition and amplification subunit includes a second silicon photocell PC2, a sixth operational amplifier U6, a seventh operational amplifier U7, a fourteenth resistor R14, a fifteenth resistor R15, a third capacitor C3 and a fourth capacitor C4;

[0046] The output end of the second silicon photocell PC2 is electrically connected to the inverting input end of the sixth operational amplifier U6;

[0047] The inverting input terminal of the sixth operational amplifier U6 is electrically connected to the output terminal of the sixth operational amplifier U6 through the third capacitor C3 and the fourteenth resistor R14 connected in parallel;

[0048] The output terminal of the sixth operational amplifier U6 is electrically connected to one end of the fifteenth resistor R15 and the non-inverting input terminal of the seventh operational amplifier U7 through the fourth capacitor C4;

[0049] The inverting input terminal of the seventh operational amplifier U7 is electrically connected to the output terminal of the seventh operational amplifier U7.

[0050] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the signal comparison and output subunit includes a reference voltage input terminal, a pull-up voltage input terminal, an eighth operational amplifier U8, a sixteenth resistor R16, and a seventeenth resistor R17;

[0051] The reference voltage input terminal is electrically connected to the non-inverting input terminal of the eighth operational amplifier U8 through the sixteenth resistor R16;

[0052] The inverting input terminal of the eighth operational amplifier U8 is electrically connected to the output terminal of the optical signal acquisition and amplification subunit;

[0053] The pull-up voltage input terminal is electrically connected to the output terminal of the eighth operational amplifier U8 through the seventeenth resistor R17, and is used to pull up the low level output by the eighth operational amplifier U8 to a pull-up voltage level.

[0054] According to a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention, the light driving module includes an acquisition submodule, an output submodule and a data processing submodule;

[0055] One end of the acquisition submodule is electrically connected to the first end of the data processing submodule, and is used to acquire the optical signal emitted by the device to be tested and input the optical signal to the data processing submodule;

[0056] The first end of the output submodule is electrically connected to the second end of the data processing submodule, and the second end of the output submodule is electrically connected to the first end of the light-emitting tube;

[0057] The data processing submodule is used to modulate the optical signal and transmit the processed optical signal to the light emitting tube through the output submodule to drive the light emitting tube to emit light.

[0058] In summary, one or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0059] First, the light-emitting driver module is electrically connected to the first end of the light-emitting diode (LED). It primarily collects light signals emitted by the device under test and drives the LED to emit light based on these signals. This allows the device to flexibly adjust the LED's light output based on real-world signals provided by an external device, accurately simulating the device's optical behavior under different conditions. Simultaneously, one end of the feedback regulation module is electrically connected to the second end of the LED, enabling the device to obtain real-time information about the LED's operating status during the lighting process, enabling feedback regulation. Within the feedback regulation module, a first feedback regulation submodule and a second feedback regulation submodule are interconnected. This design enables the device to precisely regulate the LED's luminous intensity and current, respectively. The first feedback regulation submodule is responsible for feedback regulation based on the LED's light intensity, ensuring that the LED's light output remains within a preset range, thereby preventing the light signal from being too strong or too weak. Simultaneously, the second feedback regulation submodule performs feedback regulation by monitoring the current flowing through the LED. The LED's operating current directly affects the stability of its light output. Therefore, controlling the current through the second feedback regulation submodule effectively prevents current fluctuations from affecting the LED's operating state. In summary, through the solution of the feedback regulation circuit of the multi-channel optical device, the device can flexibly collect and drive the light-emitting tube. At the same time, through the multi-level feedback regulation mechanism, the light intensity of the light-emitting tube in the oximeter simulation device can be precisely controlled to ensure the stability of the optical signal and the simulation accuracy during the simulation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0061] Figure 1 The utility model is a structural diagram of a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit.

[0062] Figure 2 This is a circuit diagram of the feedback regulation module provided by the present invention.

[0063] Figure 3 This is a circuit diagram of the voltage input unit provided by the utility model.

[0064] Figure 4 This is a circuit diagram of the control signal unit provided by the utility model. DETAILED DESCRIPTION

[0065] To make the purpose, technical solutions, and advantages of the present invention more clear, the following will be combined with the accompanying drawings to clearly and completely describe the technical solutions of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0066] It should be noted that in the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly identifying the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. The terms "including," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0067] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "electrical connection," "electrical connection," or "communication electrical connection" should be understood in a broad sense. For example, "electrical connection," "electrical connection," or "communication electrical connection" may refer not only to physical electrical connection but also to electrical connection or signal electrical connection. For example, it may be a direct electrical connection, i.e., a physical electrical connection, or an indirect electrical connection through at least one intermediate element, as long as the circuit is interconnected. It may also refer to internal connectivity between two elements. In addition to signal electrical connection through a circuit, signal electrical connection may also refer to signal electrical connection through a media medium, such as radio waves. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0068] The following combination Figures 1-4 The present invention describes a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit.

[0069] Figure 1 This is a schematic diagram of the structure of a blood oxygen simulation device based on a multi-path optical device feedback regulation circuit provided by the present invention. Figure 1 As shown, the device includes: a light-emitting driving module, a feedback regulating module and a light-emitting tube; the feedback regulating module includes a first feedback regulating submodule and a second feedback regulating submodule;

[0070] The light driving module is electrically connected to the first end of the light emitting tube, and is used to collect the light signal emitted by the device to be tested and drive the light emitting tube to emit light;

[0071] One end of the first feedback regulation submodule is electrically connected to one end of the second feedback regulation submodule;

[0072] A first feedback regulation submodule, configured to perform feedback regulation on the light emitting tube according to the light emitting intensity of the light emitting tube;

[0073] The second feedback regulation submodule is used to perform feedback regulation on the light emitting tube according to the intensity of the current flowing through the light emitting tube.

[0074] In this embodiment, the device achieves precise control of the light signal and current signal of the light-emitting tube through the coordinated work of the light-emitting drive module, the feedback regulation module and the light-emitting tube, so as to ensure that the blood oxygen simulation device remains stable and efficient under various working conditions.

[0075] To further optimize the output stability of the LED, one end of the feedback regulation module is connected to the second end of the LED, forming a closed-loop feedback control circuit. This design not only monitors the real-time status of the LED but also enables precise feedback regulation based on the light and current signals. The feedback regulation module comprises a first feedback regulation submodule and a second feedback regulation submodule, each of which independently regulates the LED's light intensity and current.

[0076] The first feedback regulation submodule detects the light intensity signal of the LED in real time and adjusts the LED's operating state through a feedback loop. By continuously monitoring the light signal, the submodule can make precise adjustments based on changes in light intensity, ensuring that the LED's output signal consistently meets predetermined requirements under varying operating conditions. Meanwhile, the second feedback regulation submodule primarily regulates the current flowing through the LED. Since current fluctuations directly affect the LED's light intensity output, this module's design ensures precise control of the LED's current.

[0077] In one possible implementation, Figure 1 As shown, the light-emitting driving module includes an acquisition submodule, an output submodule and a data processing submodule;

[0078] One end of the acquisition submodule is electrically connected to the first end of the data processing submodule, and is used to acquire the optical signal emitted by the device to be tested and input the optical signal to the data processing submodule;

[0079] The first end of the output submodule is electrically connected to the second end of the data processing submodule, and the second end of the output submodule is electrically connected to the first end of the light-emitting tube;

[0080] The data processing submodule is used to modulate the optical signal and transmit the processed optical signal to the light emitting tube through the output submodule to drive the light emitting tube to emit light.

[0081] Specifically, one end of the acquisition submodule is electrically connected to the first end of the data processing submodule, primarily responsible for collecting optical signals emitted by the device under test. Light signal acquisition is a core step in the light-emitting driver module. Through this connection, the acquisition submodule rapidly transmits the received optical signals to the data processing submodule. This design enables the device to respond to the optical output of the test device in real time and feed it into the internal circuitry for subsequent processing.

[0082] After processing the optical signal, the output submodule is responsible for transmitting the processed signal to the light-emitting diode. The first end of the output submodule is electrically connected to the second end of the data processing submodule, ensuring smooth transmission of the processed signal. The second end of the output submodule is electrically connected to the first end of the light-emitting diode. Through this connection, the device can directly transmit the signal output by the data processing submodule to the light-emitting diode, driving the light-emitting diode to emit light.

[0083] The advantage of this circuit connection is that, through efficient signal transmission between the submodules, the device can quickly acquire optical signals from external devices. Through processing and output, it ensures that the light output of the LED matches the actual test conditions. The acquisition submodule captures the external optical signal, the data processing submodule modulates the signal to ensure it meets simulation requirements, and the output submodule ensures seamless signal transmission to the LED. The tight circuit connection of the entire module ensures consistency and accuracy in signal acquisition, processing, and output, enabling the device to flexibly control the LED based on the input optical signal, improving simulation accuracy and device response speed.

[0084] It should be noted that in this embodiment, in addition to the core light-emitting driving module and feedback adjustment module, the device also includes a display module, a power module, a microprocessor and a button module. The integration of these modules enables the entire blood oxygen simulation device to have higher functionality and user interactivity.

[0085] Reference Figure 2 , Figure 2 This is a circuit diagram of the feedback regulation module provided by the present invention.

[0086] In one possible implementation, Figure 2 As shown, the first feedback regulation submodule includes: a first silicon photocell PC1, a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a second resistor R2 and a third resistor R3;

[0087] The inverting input terminal of the first operational amplifier U1 is electrically connected to one end of the first resistor R1 and the output terminal of the first silicon photocell PC1;

[0088] The other end of the first resistor R1 and the non-inverting input end of the second operational amplifier U2 are both electrically connected to the output end of the first operational amplifier U1;

[0089] One end of the second resistor R2 is electrically connected to the inverting input terminal of the second operational amplifier U2, and the other end of the second resistor R2 is electrically connected to the output terminal of the second operational amplifier U2;

[0090] One end of the third resistor R3 is electrically connected to the output end of the second operational amplifier U2 .

[0091] Specifically, the output of the first silicon photocell PC1 is electrically connected to the inverting input of the first operational amplifier U1. Through this connection, the device converts the light signal from the LED into an electrical signal. As the optical signal conversion element, PC1's core function is to capture the LED's light intensity and convert it into a corresponding electrical signal, which is then transmitted to amplifier U1. U1 performs preliminary processing on this signal and stabilizes it through a negative feedback loop, ensuring that the signal accurately reflects the changes in the LED's light intensity.

[0092] To ensure the stability and accuracy of the operational amplifier, the first resistor R1 is designed to connect the inverting input and output of the first operational amplifier U1, forming a negative feedback loop. This design effectively limits U1's gain, preventing signal distortion caused by over-amplification. Simultaneously, the other end of R1 is connected to the non-inverting input of the second operational amplifier U2, ensuring that the output signal from U1 is smoothly transmitted to U2 for further processing. Through this circuit design, the first feedback regulation submodule can convert the optical signal and maintain it within a reasonable electrical signal range, preventing excessive or insufficient signals from affecting the accuracy of the feedback regulation.

[0093] Next, the inverting input of the second operational amplifier, U2, is connected to its output via a second resistor, R2, forming a feedback loop for more precise signal regulation. R2 controls U2's gain, enabling further amplification or adjustment based on the signal from U1, ensuring the output signal accurately reflects the changes in the LED's light intensity. This dual-stage amplification design allows for more precise processing of the input signal, making the feedback regulation more sensitive and efficient.

[0094] Finally, one end of the third resistor R3 is connected to the output of the second operational amplifier U2. R3 is designed to further stabilize the signal during transmission and provide appropriate current control for subsequent circuits. R3 not only ensures signal transmission stability but also provides the device with the ability to adjust the output level, further enhancing the overall control capabilities of the first feedback regulation submodule.

[0095] Through the circuit connection of the above components, the first feedback regulation submodule in this embodiment can collect and accurately regulate the light intensity signal of the light emitting tube in real time.

[0096] In one possible implementation, Figure 2 As shown, the second feedback regulation submodule includes: a voltage input unit, a second operational amplifier U2, a third operational amplifier U3, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1;

[0097] One end of the second resistor R2 is electrically connected to the inverting input terminal of the second operational amplifier U2, and the other end of the second resistor R2 is electrically connected to the output terminal of the second operational amplifier U2;

[0098] One end of the third resistor R3 is electrically connected to the output end of the second operational amplifier U2;

[0099] One end of the fourth resistor R4 is electrically connected to the voltage input unit, and the other end of the fourth resistor R4 is electrically connected to the inverting input terminal of the third operational amplifier U3 and one end of the first capacitor C1. At the same time, the fourth resistor R4 is electrically connected to the output terminal of the third operational amplifier U3 through the first capacitor C1.

[0100] One end of the sixth resistor R6 is electrically connected to the output end of the third operational amplifier U3;

[0101] One end of the fifth resistor R5 is electrically connected to the other end of the sixth resistor R6 and the inverting input end of the second operational amplifier U2 .

[0102] Specifically, one end of the second resistor R2 is connected to the inverting input of the second operational amplifier U2, and the other end is connected to the output of U2, forming U2's negative feedback loop. This design allows U2 to initially amplify and regulate the LED current signal, ensuring that the output signal accurately reflects the actual current changes. R2 controls U2's gain, preventing over-amplification of the signal while ensuring the stability of the feedback regulation.

[0103] Next, one end of the third resistor, R3, is connected to the output of U2, transmitting the initially amplified signal to the next stage of the circuit. R3 acts as a current limiter during signal transmission, ensuring that the signal current remains within a reasonable range and preventing excessive current from damaging subsequent circuit components. This design ensures signal stability during transmission, providing a reliable foundation for subsequent regulation.

[0104] One end of the fourth resistor R4 is connected to the voltage input unit, and the other end is connected to both the inverting input of the third operational amplifier U3 and one end of the first capacitor C1. R4 provides the voltage input signal to U3, while C1, in parallel, modulates the signal, filtering out high-frequency noise and ensuring the smoothness of the input signal. This circuit design allows U3 to receive a stable voltage signal and further amplify it. In this process, C1, in synergy with R4, effectively improves the device's ability to resist interference from the input signal.

[0105] At the same time, R4 is electrically connected to the output of the third operational amplifier, U3, via the first capacitor, C1, forming a negative feedback loop for U3. This feedback loop design allows U3 to dynamically adjust the input signal, ensuring the stability and accuracy of the output signal. As the second-stage amplifier, U3 plays a crucial role in this design, responsible for further adjusting the amplified signal from U2 to ensure that the LED current is precisely controlled.

[0106] One end of the sixth resistor R6 is connected to the output of U3, controlling the output current and preventing excessive current from impacting the device. By limiting current, R6 ensures signal stability as it enters the feedback loop. Simultaneously, one end of the fifth resistor R5 is connected to the other end of the sixth resistor R6 and the inverting input of the second operational amplifier U2, forming a complete feedback loop. This dual-feedback design enables efficient and precise regulation of the current signal, ensuring the stability and control accuracy of the LED current.

[0107] In one possible implementation, Figure 2 As shown, the feedback regulation module also includes: a light-emitting diode drive control submodule and a current control submodule;

[0108] One end of the light-emitting diode drive control submodule is electrically connected to the output end of the first feedback regulation submodule and the output end of the second feedback regulation submodule, and the other end of the light-emitting diode drive control submodule is electrically connected to the input end of the current control submodule;

[0109] The output end of the current control submodule is electrically connected to the negative feedback end of the second feedback regulation submodule.

[0110] Specifically, the design of the LED drive control submodule relies on the joint processing of output signals from the first and second feedback regulation submodules. One end is connected to the output of the first feedback regulation submodule, receiving signals related to the LED's light intensity; the other end is connected to the output of the second feedback regulation submodule, receiving signals related to the current intensity. This dual connection allows the LED drive control submodule to simultaneously monitor and process signals from both feedback regulation loops, ensuring a close match between the LED's light intensity and current.

[0111] To ensure accurate and stable current control for the LED, the other end of the LED driver control submodule is electrically connected to the input of the current control submodule. The current control submodule's task is to further regulate and limit the current based on the signal output by the LED driver control submodule, ensuring that the LED's operating current remains within a set range.

[0112] Next, the output of the current control submodule is electrically connected to the negative feedback terminal of the second feedback regulation submodule. This connection forms a closed feedback loop, enabling the current control submodule to receive feedback signals in real time and dynamically adjust the current output based on the feedback results. By feeding the current signal back to the second feedback regulation submodule, the current control submodule can quickly make adjustments based on actual current changes, ensuring precise control of the LED current.

[0113] This circuit connection enables the feedback control module to achieve dual feedback regulation, controlling both light intensity and current signals simultaneously. The LED driver control submodule receives both light intensity and current feedback signals, processes them, and outputs them to the current control submodule, ultimately ensuring current stability through the feedback loop.

[0114] In one possible implementation, Figure 2 As shown, the light-emitting diode drive control submodule includes a fourth operational amplifier U4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q1, a second capacitor C2, a light-emitting diode drive signal terminal and a control signal unit;

[0115] One end of the seventh resistor R7 is electrically connected to the non-inverting input terminal of the fourth operational amplifier U4, one end of the ninth resistor R9 and the collector of the first transistor Q1, and the other end of the seventh resistor R7 is electrically connected to the light-emitting diode drive signal terminal;

[0116] One end of the eighth resistor R8 is electrically connected to the inverting input terminal of the fourth operational amplifier U4, and the other end of the eighth resistor R8 is electrically connected to one end of the second capacitor C2;

[0117] The output end of the fourth operational amplifier U4 is electrically connected to the input end of the current control submodule and the other end of the second capacitor C2;

[0118] The emitter of the first transistor Q1 is electrically connected to the other end of the ninth resistor R9;

[0119] The control signal unit is electrically connected to the base of the first transistor Q1 and is used to control the conduction state of the first transistor Q1.

[0120] Specifically, one end of the seventh resistor R7 is electrically connected to the non-inverting input of the fourth operational amplifier U4, and is also connected to one end of the ninth resistor R9 and the collector of the first transistor Q1. The other end of R7 is connected to the LED drive signal terminal. This design allows the LED drive signal to enter the non-inverting input of U4 through R7, thereby controlling the drive of the LED.

[0121] One end of the eighth resistor R8 is connected to the inverting input of the fourth operational amplifier U4, and the other end is connected to one end of the second capacitor C2. The combination of R8 and C2 forms a feedback loop, ensuring effective control of U4's gain and maintaining a stable output signal. C2 acts as a filter, removing high-frequency noise and ensuring smooth signal transmission.

[0122] The output of the fourth operational amplifier U4 is connected to both the input of the current control submodule and the other end of the second capacitor C2. This means that the output signal of U4 is not only transmitted to the current control submodule for further current regulation, but also provides feedback regulation through the connection with C2, further stabilizing the output signal.

[0123] The emitter of the first transistor Q1 is connected to the other end of the ninth resistor R9, forming the transistor's amplification control loop. The base of Q1 is controlled by a control signal unit, which determines the transistor's conduction state. The control signal unit is introduced to adjust the conduction or cutoff of Q1 using an external signal, thereby achieving real-time control of the LED's drive. When Q1 is on, current flows through Q1, driving the LED to emit light; when Q1 is off, the current is blocked, and the LED stops operating.

[0124] In one possible implementation, Figure 2 As shown, the current control submodule includes a second transistor Q2, a third transistor Q3, a tenth resistor R10, an eleventh resistor R11, a first diode D1 and a control signal unit;

[0125] The base of the second triode Q2 is electrically connected to the other end of the light emitting diode drive control submodule, the collector of the second triode Q2 is electrically connected to the cathode of the light emitting diode, and the emitter of the second triode Q2 is electrically connected to one end of the tenth resistor R10 and the collector of the third triode Q3.

[0126] The other end of the tenth resistor R10 is electrically connected to the anode of the first diode D1;

[0127] The cathode of the first diode D1 is electrically connected to the base of the third transistor Q3 through the control signal unit;

[0128] A control signal unit, used to control the conduction state of the third transistor Q3;

[0129] The emitter of the third transistor Q3 is electrically connected to the negative feedback terminal of the second feedback regulation submodule through an eleventh resistor.

[0130] Specifically, the base of the second transistor Q2 is connected to the other end of the LED drive control submodule. This connection ensures that Q2 can receive signals from the drive control module, thereby controlling the LED's operating current based on the signal's strength. Q2's collector is connected to the LED's cathode, directly participating in the LED's current control. This design allows Q2 to regulate the current flowing through the LED during operation, ensuring stable light output. Simultaneously, Q2's emitter is connected to one end of the tenth resistor R10 and to the collector of the third transistor Q3. This connection forms a current transmission path, ensuring effective control and regulation of the LED's current.

[0131] The other end of the tenth resistor R10 is electrically connected to the anode of the first diode D1. R10 limits the current flowing through Q2, preventing excessive current from causing device instability or damage. The current limiting effect of R10 ensures that the current flowing through the light-emitting diode in the device remains within a safe range, thereby protecting the normal operation of the circuit. Simultaneously, the first diode D1 provides reverse phase protection in this circuit, with its cathode connected to the base of the third transistor Q3 via the control signal unit. The design of D1 ensures that when the current direction or voltage polarity changes, the diode prevents reverse current from damaging the transistor and the circuit.

[0132] The control signal unit controls the conduction state of the third transistor, Q3, by controlling its base. Q3's on or off state determines the current flow in the device, thereby affecting the operating current of the LED. When the control signal unit determines that Q3 needs to be turned on, a path is formed between Q3's collector and emitter, allowing current to flow smoothly through the LED. Conversely, when Q3 is in the off state, the current path is blocked, and the LED stops operating. This design ensures that the device can flexibly and accurately control the operating state of the LED, thereby achieving precise current regulation.

[0133] Furthermore, the emitter of the third transistor Q3 is connected to the negative feedback terminal of the second feedback regulation submodule via the eleventh resistor R11. This feedback loop design ensures that the device can adjust the LED current in real time based on feedback information. R11 acts as a current-limiting resistor, further ensuring safe current transmission and preventing excessive current from affecting the feedback loop. This closed-loop feedback control mechanism allows the device to dynamically adjust the LED operating current, ensuring stability under various loads and operating conditions.

[0134] Reference Figure 3 , Figure 3 This is a circuit diagram of the voltage input unit provided by the utility model.

[0135] In a possible implementation, the voltage input unit includes: a digital-to-analog converter, a twelfth resistor R12, a thirteenth resistor R13, and a fifth operational amplifier U5;

[0136] The output terminal of the digital-to-analog converter is electrically connected to one end of the twelfth resistor R12;

[0137] The other end of the twelfth resistor R12 and one end of the thirteenth resistor R13 are both electrically connected to the inverting input terminal of the fifth operational amplifier U5;

[0138] The other end of the thirteenth resistor R13 is electrically connected to the output end of the fifth operational amplifier U5;

[0139] An output terminal of the fifth operational amplifier U5 is electrically connected to one end of the fourth resistor R4 .

[0140] Specifically, the digital-to-analog converter (DAC) converts the input digital signal into an analog voltage signal. This process is crucial because the device's output voltage is controlled by a digital input, and the DAC converts the digital signal into an analog signal that can be processed by subsequent circuits. The DAC's output is electrically connected to one end of the twelfth resistor, R12. R12 acts as a current limiter, ensuring that the current output from the DAC does not exceed the limit, thereby protecting subsequent circuit components from damage.

[0141] The other end of the twelfth resistor R12 and one end of the thirteenth resistor R13 are both connected to the inverting input of the fifth operational amplifier U5. This connection design forms a negative feedback network. The parallel connection of R12 and R13 is used to adjust the gain of U5, ensuring that the input analog signal is stably amplified during transmission. The introduction of a negative feedback loop ensures the stability of operational amplifier U5, enabling it to appropriately amplify the received signal and avoid device instability caused by excessive or insufficient signals. Through this circuit, the device can stably regulate the input voltage, ensuring its accuracy and reliability.

[0142] The other end of resistor R13 is connected to the output of the fifth operational amplifier U5, forming a complete feedback loop. R13 further adjusts U5's gain so that the output voltage accurately reflects changes in the input signal. This feedback control enables U5 to appropriately amplify and stabilize the input signal, generating a precise output voltage. Through the synergistic effect of R12 and R13, the circuit ensures that the input signal remains stable under varying load conditions, preventing voltage signal fluctuations from affecting the operation of subsequent circuits.

[0143] The output of the fifth operational amplifier U5 is electrically connected to one end of the fourth resistor R4, ensuring stable transmission of the amplified voltage signal to the next circuit stage. U5 plays a key role in voltage signal conditioning and amplification. Its precise control and stable output provide a reliable foundation for the device's voltage control. R4 further limits the current during transmission, preventing excessive current from entering the subsequent control loop and ensuring device safety.

[0144] It should be noted that the voltage input unit can also be composed of a separate negative -2.5V power supply.

[0145] Reference Figure 4 , Figure 4 This is a circuit diagram of the control signal unit provided by the utility model.

[0146] In one possible implementation, Figure 4 As shown, the control signal unit includes an optical signal acquisition and amplification subunit and a signal comparison and output subunit;

[0147] One end of the optical signal collection and amplification subunit is electrically connected to one end of the signal comparison and output subunit, and is used to collect the optical signal of the light-emitting tube and convert it into an electrical signal, amplify the electrical signal, and output the amplified electrical signal to the signal comparison and output subunit;

[0148] The signal comparison and output subunit is used to compare the amplified electrical signal with a preset reference voltage to generate an output signal.

[0149] Specifically, first, the optical signal acquisition and amplification subunit is used to collect optical signals from the light-emitting tube and convert them into electrical signals. The design of the acquisition subunit is based on a photoelectric converter, such as a photodiode, which converts the optical signal into a corresponding electrical signal. This electrical signal is then transmitted to the amplifier circuit for amplification processing to ensure that the subsequent signal processing has sufficient signal strength. The amplified electrical signal is output from the subunit and transmitted through the circuit to the signal comparison and output subunit for further processing. This circuit connection ensures that the optical signal from the light-emitting tube can be accurately collected, and the signal strength is enhanced by the amplifier circuit to prevent the signal from being distorted or attenuated during transmission.

[0150] The signal comparison and output subunit is responsible for comparing the amplified signal from the light signal acquisition and amplification subunit with a preset reference voltage. Using a comparator or operational amplifier, this subunit compares the amplified electrical signal with the reference voltage within the device. By comparing the voltage corresponding to the light signal with a preset standard, the device determines whether the current light output of the LED is within the set range. If the signal deviates from the set value, the device generates an output signal to adjust the operating state of the LED. This comparison process is the core of control signal generation, ensuring that the device can provide feedback and adjustments based on actual light intensity changes.

[0151] The optical signal acquisition and amplification subunit and the signal comparison and output subunit utilize a direct transmission circuit connection, ensuring that, after conversion and amplification, the optical signal is immediately transmitted to the comparison unit for processing. This direct connection reduces potential interference during signal transmission and ensures real-time and accurate signal processing. This tight circuit connection enables the entire control signal unit to continuously monitor and provide instant feedback on the LED's light output.

[0152] In one possible implementation, Figure 4 As shown, the optical signal acquisition and amplification subunit includes a second silicon photocell PC2, a sixth operational amplifier U6, a seventh operational amplifier U7, a fourteenth resistor R14, a fifteenth resistor R15, a third capacitor C3 and a fourth capacitor C4;

[0153] The output terminal of the second silicon photocell PC2 is electrically connected to the inverting input terminal of the sixth operational amplifier U6;

[0154] The inverting input terminal of the sixth operational amplifier U6 is electrically connected to the output terminal of the sixth operational amplifier U6 through the third capacitor C3 and the fourteenth resistor R14 connected in parallel;

[0155] The output terminal of the sixth operational amplifier U6 is electrically connected to one end of the fifteenth resistor R15 and the non-inverting input terminal of the seventh operational amplifier U7 through the fourth capacitor C4;

[0156] An inverting input terminal of the seventh operational amplifier U7 is electrically connected to an output terminal of the seventh operational amplifier U7 .

[0157] Specifically, the output of the second silicon photocell PC2 is electrically connected to the inverting input of the sixth operational amplifier U6. PC2 is responsible for converting the light signal from the LED into an electrical signal for subsequent processing. As a photoelectric conversion device, PC2 captures the light output from the LED and converts it into an electrical signal proportional to the light intensity. This electrical signal, through its connection to U6, enters the operational amplifier's signal processing circuit.

[0158] To ensure signal stability during transmission and amplification, the inverting input of the sixth operational amplifier U6 is electrically connected to its output via a third capacitor C3 and a fourteenth resistor R14 connected in parallel. This feedback structure enables the circuit to stably amplify the input signal while limiting the gain. R14 acts as a gain control, limiting U6's amplification factor and preventing signal distortion, while C3 filters out high-frequency noise to ensure signal smoothness. The introduction of this feedback loop enhances the device's amplification accuracy for weak optical signals while preventing signal interference caused by noise.

[0159] The output of the sixth operational amplifier U6 is connected to one end of a fifteenth resistor R15 and the non-inverting input of the seventh operational amplifier U7 via a fourth capacitor C4. C4 further filters the signal, removing any remaining high-frequency noise and ensuring sufficient stability of the signal transmitted to U7. R15 limits the current flowing through the input of U7 to prevent damage to the operational amplifier due to excessive current. This design allows the device to stably transmit the initially amplified electrical signal to the second-stage amplifier for further processing.

[0160] The seventh operational amplifier, U7, serves as the second-stage amplifier, further amplifying the signal to ensure sufficient signal strength for subsequent comparison units. The inverting input of U7 is connected to its output, forming a negative feedback loop. This feedback loop controls U7's gain, preventing over-amplification and ensuring output signal stability. U7's design ensures high precision and low noise in the amplified signal, providing a reliable electrical signal for subsequent signal comparison and output.

[0161] In one possible implementation, Figure 4 As shown, the signal comparison and output subunit includes a reference voltage input terminal, a pull-up voltage input terminal, an eighth operational amplifier U8, a sixteenth resistor R16, and a seventeenth resistor R17;

[0162] The reference voltage input terminal is electrically connected to the non-inverting input terminal of the eighth operational amplifier U8 through a sixteenth resistor R16;

[0163] The inverting input terminal of the eighth operational amplifier U8 is electrically connected to the output terminal of the optical signal acquisition and amplification subunit;

[0164] The pull-up voltage input terminal is electrically connected to the output terminal of the eighth operational amplifier U8 through the seventeenth resistor R17 , and is used to pull the low level output by the eighth operational amplifier U8 up to the pull-up voltage level.

[0165] Specifically, the reference voltage input is electrically connected to the non-inverting input of the eighth operational amplifier U8 via a sixteenth resistor, R16. The reference voltage is a reference voltage used by the device to assess whether the light output of the LED is within a predetermined range. Through the connection of R16, the reference voltage can be stably transmitted to the non-inverting input of U8, providing a standard for signal comparison. R16 acts as a current limiter and signal stabilizer, preventing excessive reference voltage signal fluctuations that could affect the normal operation of U8. This design ensures that the device consistently maintains a stable reference voltage, serving as an important basis for determining whether the light signal meets expectations.

[0166] Meanwhile, the inverting input of the eighth operational amplifier, U8, is connected to the output of the optical signal acquisition and amplification subunit. This design allows the amplified optical signal to be introduced into U8 for real-time comparison with a reference voltage. As the core comparator, U8 accurately compares the input optical signal with the reference voltage. If the amplified optical signal is greater than or less than the reference voltage, U8 outputs a corresponding high or low signal. This design enables the device to quickly respond to changes in the optical signal and adjust the operating state of the light-emitting diode.

[0167] To ensure that the signal output by the eighth operational amplifier U8 can drive subsequent circuitry, the pull-up voltage input is connected to the output of U8 via a seventeenth resistor, R17. The pull-up voltage is used to pull the low-level signal output by U8 up to an appropriate voltage level, ensuring that the output signal has sufficient strength to drive subsequent circuitry. R17 acts as a current limiter, ensuring that the pull-up process does not cause excessive current surges that could affect device stability. Through this connection, when U8 outputs a low level, R17 pulls the signal up to the pull-up voltage level, ensuring that the output signal meets the device's voltage level requirements.

[0168] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A blood oxygen simulation device based on a multi-path optical device feedback regulation circuit, characterized in that: include: Light-emitting drive module, feedback regulation module and light-emitting diode; The feedback regulation module includes a first feedback regulation submodule and a second feedback regulation submodule; The light driving module is electrically connected to the first end of the light emitting diode, and is used to collect the light signal emitted by the device to be tested and drive the light emitting diode to emit light; One end of the first feedback regulation submodule is electrically connected to one end of the second feedback regulation submodule; The first feedback regulation submodule is configured to perform feedback regulation on the light emitting tube according to the light emitting intensity of the light emitting tube; The second feedback regulation submodule is used to perform feedback regulation on the light emitting tube according to the intensity of the current flowing through the light emitting tube.

2. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 1, characterized in that: The first feedback regulation submodule includes: a first silicon photocell PC1, a first operational amplifier U1, a second operational amplifier U2, a first resistor R1, a second resistor R2 and a third resistor R3; The inverting input terminal of the first operational amplifier U1 is electrically connected to one end of the first resistor R1 and the output terminal of the first silicon photocell PC1 at the same time; The other end of the first resistor R1 and the non-inverting input end of the second operational amplifier U2 are both electrically connected to the output end of the first operational amplifier U1; One end of the second resistor R2 is electrically connected to the inverting input terminal of the second operational amplifier U2, and the other end of the second resistor R2 is electrically connected to the output terminal of the second operational amplifier U2; One end of the third resistor R3 is electrically connected to the output end of the second operational amplifier U2.

3. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 1, characterized in that: The second feedback regulation submodule includes: a voltage input unit, a second operational amplifier U2, a third operational amplifier U3, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a first capacitor C1; One end of the second resistor R2 is electrically connected to the inverting input terminal of the second operational amplifier U2, and the other end of the second resistor R2 is electrically connected to the output terminal of the second operational amplifier U2; One end of the third resistor R3 is electrically connected to the output end of the second operational amplifier U2; One end of the fourth resistor R4 is electrically connected to the voltage input unit, and the other end of the fourth resistor R4 is electrically connected to the inverting input terminal of the third operational amplifier U3 and one end of the first capacitor C1. At the same time, the fourth resistor R4 is electrically connected to the output terminal of the third operational amplifier U3 through the first capacitor C1. One end of the sixth resistor R6 is electrically connected to the output end of the third operational amplifier U3; One end of the fifth resistor R5 is electrically connected to the other end of the sixth resistor R6 and the inverting input end of the second operational amplifier U2.

4. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 1, characterized in that: The feedback regulation module further includes: a light emitting diode drive control submodule and a current control submodule; One end of the light-emitting diode drive control submodule is electrically connected to the output end of the first feedback regulation submodule and the output end of the second feedback regulation submodule, and the other end of the light-emitting diode drive control submodule is electrically connected to the input end of the current control submodule; The output end of the current control submodule is electrically connected to the negative feedback end of the second feedback regulation submodule.

5. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 4, characterized in that: The light-emitting diode drive control submodule includes a fourth operational amplifier U4, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a first transistor Q1, a second capacitor C2, a light-emitting diode drive signal terminal and a control signal unit; One end of the seventh resistor R7 is electrically connected to the non-inverting input terminal of the fourth operational amplifier U4, one end of the ninth resistor R9 and the collector of the first transistor Q1, and the other end of the seventh resistor R7 is electrically connected to the light-emitting diode drive signal terminal; One end of the eighth resistor R8 is electrically connected to the inverting input terminal of the fourth operational amplifier U4, and the other end of the eighth resistor R8 is electrically connected to one end of the second capacitor C2; The output end of the fourth operational amplifier U4 is electrically connected to the input end of the current control submodule and the other end of the second capacitor C2 at the same time; The emitter of the first transistor Q1 is electrically connected to the other end of the ninth resistor R9; The control signal unit is electrically connected to the base of the first transistor Q1 and is used to control the conduction state of the first transistor Q1.

6. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 4, characterized in that: The current control submodule includes a second transistor Q2, a third transistor Q3, a tenth resistor R10, an eleventh resistor R11, a first diode D1 and a control signal unit; The base of the second transistor Q2 is electrically connected to the other end of the light-emitting diode drive control submodule, the collector of the second transistor Q2 is electrically connected to the cathode of the light-emitting diode, and the emitter of the second transistor Q2 is electrically connected to one end of the tenth resistor R10 and the collector of the third transistor Q3. The other end of the tenth resistor R10 is electrically connected to the anode of the first diode D1; The cathode of the first diode D1 is electrically connected to the base of the third transistor Q3 through the control signal unit; The control signal unit is used to control the conduction state of the third transistor Q3; The emitter of the third transistor Q3 is electrically connected to the negative feedback terminal of the second feedback regulation submodule through the eleventh resistor.

7. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 3, characterized in that: The voltage input unit includes: a digital-to-analog converter, a twelfth resistor R12, a thirteenth resistor R13, and a fifth operational amplifier U5; The output end of the digital-to-analog converter is electrically connected to one end of the twelfth resistor R12; The other end of the twelfth resistor R12 and one end of the thirteenth resistor R13 are both electrically connected to the inverting input terminal of the fifth operational amplifier U5; The other end of the thirteenth resistor R13 is electrically connected to the output end of the fifth operational amplifier U5; An output terminal of the fifth operational amplifier U5 is electrically connected to one end of the fourth resistor R4 .

8. The blood oxygen simulation device based on a multi-path optical device feedback regulation circuit according to any one of claims 5 and 6, characterized in that: The control signal unit includes an optical signal acquisition and amplification subunit and a signal comparison and output subunit; One end of the optical signal collection and amplification subunit is electrically connected to one end of the signal comparison and output subunit, and is used to collect the optical signal of the light-emitting tube and convert it into an electrical signal, amplify the electrical signal, and output the amplified electrical signal to the signal comparison and output subunit; The signal comparison and output subunit is used to compare the amplified electrical signal with a preset reference voltage to generate an output signal.

9. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 8, characterized in that: The optical signal acquisition and amplification subunit includes a second silicon photocell PC2, a sixth operational amplifier U6, a seventh operational amplifier U7, a fourteenth resistor R14, a fifteenth resistor R15, a third capacitor C3 and a fourth capacitor C4; The output end of the second silicon photocell PC2 is electrically connected to the inverting input end of the sixth operational amplifier U6; The inverting input terminal of the sixth operational amplifier U6 is electrically connected to the output terminal of the sixth operational amplifier U6 through the third capacitor C3 and the fourteenth resistor R14 connected in parallel; The output terminal of the sixth operational amplifier U6 is electrically connected to one end of the fifteenth resistor R15 and the non-inverting input terminal of the seventh operational amplifier U7 through the fourth capacitor C4; The inverting input terminal of the seventh operational amplifier U7 is electrically connected to the output terminal of the seventh operational amplifier U7.

10. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 8, characterized in that: The signal comparison and output subunit includes a reference voltage input terminal, a pull-up voltage input terminal, an eighth operational amplifier U8, a sixteenth resistor R16, and a seventeenth resistor R17; The reference voltage input terminal is electrically connected to the non-inverting input terminal of the eighth operational amplifier U8 through the sixteenth resistor R16; The inverting input terminal of the eighth operational amplifier U8 is electrically connected to the output terminal of the optical signal acquisition and amplification subunit; The pull-up voltage input terminal is electrically connected to the output terminal of the eighth operational amplifier U8 through the seventeenth resistor R17, and is used to pull up the low level output by the eighth operational amplifier U8 to a pull-up voltage level.

11. The blood oxygen simulation device based on the multi-path optical device feedback regulation circuit according to claim 1, characterized in that: The light-emitting driving module includes an acquisition submodule, an output submodule and a data processing submodule; One end of the acquisition submodule is electrically connected to the first end of the data processing submodule, and is used to acquire the optical signal emitted by the device to be tested and input the optical signal to the data processing submodule; The first end of the output submodule is electrically connected to the second end of the data processing submodule, and the second end of the output submodule is electrically connected to the first end of the light-emitting tube; The data processing submodule is used to modulate the optical signal and transmit the processed optical signal to the light emitting tube through the output submodule to drive the light emitting tube to emit light.

Images