Blood oxygen control circuit and monitor

Abstract

The utility model discloses a blood oxygen control circuit and a monitor, and relates to the technical field of infrared imaging. The blood oxygen control circuit comprises a constant current control input module, a constant current control module, a control input module and a photoelectric controller. The constant current control input module obtains an input signal and filters the input signal to output the input signal under a set frequency; the constant current control module is connected to the constant current control input module and outputs constant current according to the input signal under the set frequency; the control input module is used for acquiring a turn-on signal or a turn-off signal; the photoelectric controller is connected to the constant current control module and the control input module; the photoelectric controller comprises an infrared light-emitting device and an infrared receiving device and obtains the constant current so as to maintain stable work of the infrared light-emitting device and the infrared receiving device. And the infrared light-emitting device and the infrared receiving device are correspondingly turned on and off in response to the turn-on signal or the turn-off signal.

Description

Technical Field

[0001] The utility model relates to the technical field of infrared imaging, and particularly relates to a blood oxygen control circuit and a monitor. Background Technique

[0002] Blood oxygen is one of the important physiological parameters reflecting respiratory and circulatory functions, and has wide applications in the fields of clinical monitoring and daily health monitoring. The blood oxygen function in a monitor is a medical device that can continuously monitor blood oxygen levels. When the blood oxygen saturation is less than or equal to 93%, medical treatment is theoretically required at a hospital.

[0003] The signals fed back by blood oxygen have the following characteristics: (1) The signals are weak and are prone to introducing background interference. (2) The frequency is low, and the main frequency spectrum is distributed within 20 Hz. Considering the influence of the transition band, reasonable settings need to be made for each cut-off frequency when designing each low-pass and band-pass circuit.

[0004] In the existing blood oxygen control circuits of monitors, most of them use a general current-limiting circuit in cooperation with transistors to supply power to an infrared light-emitting diode and a red light-emitting diode. The current flowing through the light-emitting diodes will change with the environment and time. However, the blood oxygen feedback signals are relatively weak, generally in the order of millivolts, and are easily affected by factors related to the patient, resulting in incorrect blood oxygen readings on the monitor, bringing great inconvenience. Content of the Utility Model

[0005] The main technical problem to be solved by the utility model is to provide a more stable blood oxygen control circuit and its corresponding monitor.

[0006] According to a first aspect, in one embodiment, a blood oxygen control circuit is provided, including:

[0007] A constant current control input module, which acquires an input signal and filters the input signal to output an input signal at a set frequency;

[0008] A constant current control module, connected to the constant current control input module, and outputs a constant current according to the input signal at the set frequency;

[0009] A control input module, used to acquire a conduction signal or a cut-off signal;

[0010] An optoelectronic controller, connected to the constant current control module and the control input module; the optoelectronic controller includes an infrared light-emitting device and an infrared receiving device. The optoelectronic controller acquires the constant current to maintain the stable operation of the infrared light-emitting device and the infrared receiving device, and the infrared light-emitting device and the infrared receiving device turn on and off correspondingly in response to the conduction signal or the cut-off signal.

[0011] In one embodiment, the constant current control input module employs a second-order passive band-pass filter.

[0012] In one embodiment, the second-order passive band-pass filter includes a resistor R1, a resistor R2, a capacitor C1, and a capacitor C2;

[0013] The first end of the capacitor C1 is used to obtain an input signal. The second end of the capacitor C1 is connected to the resistor R1. The second end of the resistor R1 is connected to the first end of the resistor R2. The second end of the resistor R2 is grounded. The second end of the resistor R1 is also connected to the first end of the capacitor C2. The second end of the capacitor C2 is grounded. The second end of the resistor R1 is used to output the input signal at a set frequency.

[0014] In one embodiment, the constant current control module includes an amplifier U1, a resistor R3, a resistor R4, and a switching transistor Q1;

[0015] The non-inverting input terminal of the amplifier U1 is used to connect to the constant current control input module. The inverting input terminal of the amplifier U1 is connected to the first end of the resistor R3. The second end of the resistor R3 is grounded. The output terminal of the amplifier U1 is connected to the first end of the resistor R4. The second end of the resistor R4 is connected to the control terminal of the switching transistor Q1. The first end of the switching transistor Q1 is used to output a constant current. The second end of the switching transistor Q1 is connected to the first end of the resistor R3.

[0016] In one embodiment, the control input module employs a first-order passive low-pass filter.

[0017] In one embodiment, the first-order passive low-pass filter includes a resistor R5, a resistor R6, a capacitor C4, and a capacitor C5;

[0018] The first end of the resistor R5 is used to obtain a conduction signal or a turn-off signal. The second end of the resistor R5 is used to connect to an optoelectronic controller. The second end of the resistor R5 is also connected to the first end of the capacitor C4. The second end of the capacitor C4 is grounded. The first end of the resistor R6 is used to obtain a conduction signal or a turn-off signal. The second end of the resistor R6 is used to connect to an optoelectronic controller. The second end of the resistor R6 is also connected to the first end of the capacitor C5. The second end of the capacitor C5 is grounded.

[0019] In one embodiment, the optoelectronic controller further includes a first analog switch chip, a second analog switch chip, and a capacitor C3;

[0020] The first data port of the first analog switch chip is used to connect to the constant current control module, and the first data port of the second analog switch chip is used to connect to the constant current control module; the ground port of the first analog switch chip is grounded, and the ground port of the second analog switch chip is grounded; the second data port of the first analog switch chip is used to connect to the working power supply, and the second data port of the second analog switch chip is used to connect to the working power supply; the control port of the first analog switch chip is used to connect to the control input module, and the control port of the second analog switch chip is used to connect to the control input module; the power supply port of the first analog switch chip is used to connect to the working power supply, and the power supply port of the second analog switch chip is used to connect to the working power supply; the third data port of the first analog switch chip is connected to the first end of the capacitor C3, and the second end of the capacitor C3 is connected to the third data port of the second analog switch chip; the third data port of the first analog switch chip is also connected to the output end of the infrared light emitting device, and the input end of the infrared light emitting device is connected to the third data port of the second analog switch chip; the third data port of the first analog switch chip is also connected to the input end of the infrared receiving device, and the output end of the infrared receiving device is connected to the third data port of the second analog switch chip.

[0021] In one embodiment, both the first analog switch chip and the second analog switch chip are FSA4157P6X chips.

[0022] In one embodiment, the infrared light emitting device is an infrared light emitting diode, and the infrared receiving device is a red light emitting diode.

[0023] According to a second aspect, in one embodiment, a monitor is provided, including the blood oxygen control circuit in any of the above embodiments.

[0024] According to the blood oxygen control circuit and the monitor of the above embodiments, the blood oxygen control circuit includes a constant current control input module, a constant current control module, a control input module, and an optoelectronic controller. The constant current control input module obtains an input signal and inputs the input signal into the constant current control module to output a constant current. The control input module obtains a turn-on signal or a turn-off signal, and the optoelectronic controller obtains the constant current to maintain the stable operation of the infrared light emitting device and the infrared receiving device. The infrared light emitting device and the infrared receiving device turn on and off correspondingly in response to the turn-on signal or the turn-off signal. The constant current control module in the present application adjusts the output current according to the input signal input by the constant current control input module to keep the current constant, so as to ensure that the blood oxygen signal obtained by using the infrared receiving device in blood oxygen measurement is more stable and accurate. Moreover, the infrared light emitting device and the infrared receiving device of the optoelectronic controller turn on and off correspondingly in response to the turn-on signal or the turn-off signal, so as to minimize the interference between the two lights and avoid errors in the blood oxygen signal. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of a blood oxygen control circuit in an embodiment;

[0026] Figure 2 It is a circuit diagram of a blood oxygen control circuit in an embodiment;

[0027] Figure 3 It is a schematic structural diagram of a monitor in another embodiment. Detailed implementation manners

[0028] The present utility model will be further described in detail below in conjunction with the accompanying drawings through specific implementation manners. Similar elements in different implementation manners adopt related similar element numbers. In the following implementation manners, many detailed descriptions are for enabling a better understanding of the present application. However, those skilled in the art can easily recognize that some of the features can be omitted in different situations, or can be replaced by other elements, materials, or methods. In some cases, some operations related to the present application are not shown or described in the specification, which is to avoid the core part of the present application being overwhelmed by excessive descriptions. For those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the descriptions in the specification and the general technical knowledge in the art.

[0029] In addition, the features, operations, or characteristics described in the specification can be combined in any appropriate manner to form various implementation manners. At the same time, the steps or actions in the method description can also be reordered or adjusted in an obvious manner by those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for clearly describing a certain embodiment, and do not mean that they are necessary sequences, unless it is stated that a certain sequence must be followed.

[0030] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in the present application, unless otherwise specified, both include direct and indirect connections (couplings).

[0031] Please refer to Figure 1 , a blood oxygen control circuit 110 is provided in an embodiment, including a constant current control input module 111, a constant current control module 112, a control input module 113, and a photoelectric controller 114.

[0032] In one embodiment, the constant current control input module 111 is used to obtain an input signal, filter the input signal, and thus output an input signal at a set frequency. The input signal of the constant current control input module 111 is used to control the constant current control module 112, enabling the constant current control module 112 to provide a stable and accurate constant current. Unwanted frequency components are filtered out in the constant current control input module 111, and only the input signal at the set frequency is allowed to pass through, thereby improving the control accuracy.

[0033] Please refer to Figure 2 , in one embodiment, the constant current control input module 111 employs a second-order passive band-pass filter, specifically including a resistor R1, a resistor R2, a capacitor C1, and a capacitor C2. The first end of the capacitor C1 is used to obtain the input signal, the second end of the capacitor C1 is connected to the resistor R1, the second end of the resistor R1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is grounded to VSS. The second end of the resistor R1 is also connected to the first end of the capacitor C2, the second end of the capacitor C2 is grounded to VSS, and the second end of the resistor R1 is used to output the input signal at the set frequency.

[0034] In one embodiment, the lower cut-off frequency in the constant current control input module 111 is F L , and the higher cut-off frequency is F H , and the calculation formula is as follows:

[0035]

[0036] Where C C1 represents the capacitance value of the capacitor C1, R R1 represents the resistance value of the resistor R1, and R R2 represents the resistance value of the resistor R2.

[0037] In one embodiment, in the case where the input signal does not change at all, the second-order passive band-pass filter will only pass frequencies between F L and F H , and the amplification factor is less than 1. Among them, the amplification factor can be adjusted by adjusting the relationship between the resistor R1 and the resistor R2, R R1 / (R R1 +R R2 ), and the second-order passive band-pass filter will not generate any additional noise in this frequency band.

[0038] In one embodiment, the constant current control module 112 is connected to the constant current control input module 111 to output a constant current according to the input signal at the set frequency. The constant current control module 112 adjusts the output current according to the input signal input by the constant current control input module 111 to keep the current constant, which is very important for the stability and accuracy of the sensor in blood oxygen measurement.

[0039] Please refer toFigure 2 In one embodiment, the constant current control module 112 includes an amplifier U1, a resistor R3, a resistor R4, and a switching transistor Q1. The non-inverting input terminal of the amplifier U1 is used to connect to the constant current control input module 111 (i.e., connect to the second terminal of the resistor R1), the inverting input terminal of the amplifier U1 is connected to the first terminal of the resistor R3, the second terminal of the resistor R3 is grounded to VSS, the output terminal of the amplifier U1 is connected to the first terminal of the resistor R4, the second terminal of the resistor R4 is connected to the control terminal of the switching transistor Q1, the first terminal of the switching transistor Q1 is used to output a constant current, and the second terminal of the switching transistor Q1 is connected to the first terminal of the resistor R3.

[0040] In one embodiment, the switching transistor Q1 in the constant current control module 112 uses an NPN bipolar transistor MMBT3904LT1G. This bipolar transistor is suitable for low-power linear applications. In the constant current control module 112, the constant current output through the bipolar transistor can be jointly controlled by the resistor R3 and the input signal.

[0041] In one embodiment, the control input module 113 is used to obtain a turn-on signal or a turn-off signal. Among them, the control input module 113 uses a first-order passive low-pass filter. The turn-on signal or turn-off signal obtained by the control input module 113 is used to control the operation of the photoelectric controller 114. The low-pass filter allows low-frequency signals to pass through while filtering out high-frequency noise signals, so as to ensure that the photoelectric controller 114 can accurately respond to the turn-on signal or turn-off signal.

[0042] Please refer to Figure 2 In one embodiment, the first-order passive low-pass filter includes a resistor R5, a resistor R6, a capacitor C4, and a capacitor C5. The first terminal of the resistor R5 is used to obtain a turn-on signal or a turn-off signal, the second terminal of the resistor R5 is used to connect to the photoelectric controller 114, the second terminal of the resistor R5 is also connected to the first terminal of the capacitor C4, and the second terminal of the capacitor C4 is grounded to VSS. The first terminal of the resistor R6 is used to obtain a turn-on signal or a turn-off signal, the second terminal of the resistor R6 is used to connect to the photoelectric controller 114, the second terminal of the resistor R6 is also connected to the first terminal of the capacitor C5, and the second terminal of the capacitor C5 is grounded to VSS.

[0043] In one embodiment, the cut-off frequency at the input terminal of the resistor R5 in the first-order passive low-pass filter is F1, and the cut-off frequency at the input terminal of the resistor R6 in the first-order passive low-pass filter is F2, which can prevent high-frequency interference signals in the control input module 113 from being coupled into the photoelectric controller 114. The calculation formulas for the cut-off frequencies F1 and F2 are as follows:

[0044]

[0045] Among them, C C4 represents the capacitance value of the capacitor C4, R R5 represents the resistance value of the resistor R5, CC5 represents the capacitance value of capacitor C5, R R6 represents the resistance value of resistor R6.

[0046] In one embodiment, the optoelectronic controller 114 is connected between the constant current control module 112 and the control input module 113. The optoelectronic controller 114 includes an infrared light emitting device and an infrared receiving device. The optoelectronic controller 114 obtains a constant current to maintain the stable operation of the infrared light emitting device and the infrared receiving device. The infrared light emitting device and the infrared receiving device turn on and off correspondingly in response to a conduction signal or a turn-off signal to obtain a blood oxygen signal.

[0047] Please refer to Figure 2 , in one embodiment, the optoelectronic controller 114 further includes a first analog switch chip U2, a second analog switch chip U3, and a capacitor C3. The first data port of the first analog switch chip U2 (i.e., the B1 pin of the U2 chip in Figure 2 is used to connect to the constant current control module 112 (i.e., connect to the first end of the switching transistor Q1). The first data port of the second analog switch chip U3 (i.e., the B1 pin of the U3 chip in Figure 2 is used to connect to the constant current control module 112 (i.e., connect to the first end of the switching transistor Q1). The ground port of the first analog switch chip U2 (i.e., the GND pin of the U2 chip in Figure 2 is grounded to VSS. The ground port of the second analog switch chip U3 (i.e., the GND pin of the U3 chip in Figure 2 is grounded to VSS. The second data port of the first analog switch chip U2 (i.e., the B0 pin of the U2 chip in Figure 2 is used to connect to the working power supply VCC. The second data port of the second analog switch chip U3 (i.e., the B0 pin of the U3 chip in Figure 3 is used to connect to the working power supply VCC. The control port of the first analog switch chip U2 (i.e., the S pin of the U2 chip in Figure 2 is used to connect to the control input module 113 (i.e., connect to the second end of the resistor R5). The control port of the second analog switch chip U3 (i.e., the S pin of the U3 chip in Figure 2 is used to connect to the control input module 113 (i.e., connect to the second end of the resistor R6). The power supply port of the first analog switch chip U2 (i.e., the VCC pin of the U2 chip in Figure 2 is used to connect to the working power supply VCC. The power supply port of the second analog switch chip U3 (i.e., the VCC pin of the U3 chip in Figure 2 is used to connect to the working power supply VCC. The third data port of the first analog switch chip U2 (i.e., the A pin of the U2 chip in Figure 2 is connected to the first end of the capacitor C3. The second end of the capacitor C3 is connected to the third data port of the second analog switch chip U3 (i.e., the A pin of the U3 chip in Figure 2The A pin of the U3 chip). The third data port of the first analog switch chip U2 is also connected to the output end of the infrared light-emitting device, and the input end of the infrared light-emitting device is connected to the third data port of the second analog switch chip U3. The third data port of the first analog switch chip U2 is also connected to the input end of the infrared receiving device, and the output end of the infrared receiving device is connected to the third data port of the second analog switch chip U3.

[0048] In one embodiment, both the first analog switch chip U2 and the second analog switch chip U3 are FSA4157P6X chips, which have low on-time, low on-resistance, low input capacitance, and high bandwidth performance. The infrared light-emitting device is an infrared light-emitting diode CGQ1, and the infrared receiving device is a red light-emitting diode LED1.

[0049] In one embodiment, the optoelectronic controller 114 sequentially lights up the infrared light-emitting diode CGQ1 and the red light-emitting diode LED1. To prevent interference between the two lights, an alternating lighting method with a certain time interval t is adopted: the first end of the resistor R5 obtains a high level and the first end of the resistor R6 obtains a low level, the infrared light-emitting diode CGQ1 is in the lit state, and the red light-emitting diode LED1 is in the extinguished state; after t time, the first end of the resistor R5 obtains a high level and the first end of the resistor R6 obtains a high level, both the infrared light-emitting diode CGQ1 and the red light-emitting diode LED1 are in the extinguished state; after t time, the first end of the resistor R5 obtains a low level and the first end of the resistor R6 obtains a high level, the red light-emitting diode LED1 is in the lit state, and the infrared light-emitting diode CGQ1 is in the extinguished state; after t time, the first end of the resistor R5 obtains a low level and the first end of the resistor R6 obtains a low level, both the infrared light-emitting diode CGQ1 and the red light-emitting diode LED1 are in the extinguished state; after t time, the first end of the resistor R5 obtains a high level and the first end of the resistor R6 obtains a low level, the infrared light-emitting diode CGQ1 lights up again, and the red light-emitting diode LED1 goes out again. With this timing of alternating on and off, the blood oxygen acquisition circuit detects the red light-emitting diode LED1 to minimize the crosstalk between the two lights.

[0050] It should be noted that in the FSA4157P6X chip, when the S pin gets a high level, the B0 pin and the A pin are conducted; when the S pin gets a low level, the B1 pin and the A pin are conducted. Therefore, taking the example that the first end of the resistor R5 gets a high level and the first end of the resistor R6 gets a low level, the infrared light-emitting diode CGQ1 is in the lit state and the red light-emitting diode LED1 is in the off state. When the S pin of the first analog switch chip U2 gets a high level and the S pin of the second analog switch chip U3 gets a low level, the B0 pin and the A pin of the first analog switch chip U2 are conducted, and the B1 pin and the A pin in the second analog switch chip U3 are conducted. At this time, the circuit where the infrared light-emitting diode CGQ1 is located is conducted, and the circuit where the red light-emitting diode LED1 is located is turned off. Therefore, the infrared light-emitting diode CGQ1 is in the lit state and the red light-emitting diode LED1 is in the off state.

[0051] Please refer to Figure 3 , in another embodiment, a monitor 100 is provided. The monitor 100 includes a blood oxygen control circuit 110, and the blood oxygen control circuit 110 includes a constant current control input module 111, a constant current control module 112, a control input module 113, and an optoelectronic controller 114.

[0052] In one embodiment, the constant current control input module 111 is used to obtain an input signal, filter the input signal, and thus output an input signal at a set frequency. The input signal of the constant current control input module 111 is used to control the constant current control module 112, so that the constant current control module 112 can provide a stable and accurate constant current. Unwanted frequency components are filtered out in the constant current control input module 111, and only the input signal at the set frequency is allowed to pass through, thereby improving the control accuracy.

[0053] In one embodiment, the constant current control module 112 is connected to the constant current control input module 111 to output a constant current according to the input signal at the set frequency. The constant current control module 112 adjusts the output current according to the input signal input by the constant current control input module 111 to keep the current constant, which is very important for the stability and accuracy of the sensor in blood oxygen measurement.

[0054] In one embodiment, the control input module 113 is used to obtain a conduction signal or a turn-off signal. Among them, the control input module 113 adopts a first-order passive low-pass filter. The conduction signal or turn-off signal obtained by the control input module 113 is used to control the operation of the optoelectronic controller 114. Low-frequency signals are allowed to pass through in the low-pass filter, and at the same time, high-frequency noise signals are filtered out, so as to ensure that the optoelectronic controller 114 can accurately respond to the conduction signal or turn-off signal.

[0055] In one embodiment, the optoelectronic controller 114 is connected between the constant current control module 112 and the control input module 113. The optoelectronic controller 114 includes an infrared light-emitting device and an infrared receiving device. The optoelectronic controller 114 obtains a constant current to maintain the stable operation of the infrared light-emitting device and the infrared receiving device. The infrared light-emitting device and the infrared receiving device turn on or off correspondingly in response to a conduction signal or a turn-off signal to obtain a blood oxygen signal.

[0056] Since the specific circuit structures of the constant current control input module 111, the constant current control module 112, the control input module 113, and the optoelectronic controller 114 have been clearly described in the blood oxygen control circuit 110, they will not be elaborated here.

[0057] In the monitor 100 provided in the present application, when the blood oxygen control function of the monitor 100 needs to be enabled, the blood oxygen circuit can be accurately controlled. The blood oxygen control circuit 110 has good anti-crosstalk ability and can avoid incorrect blood oxygen readings of the monitor 100.

[0058] The above uses specific examples to elaborate on the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the technical field to which the present invention belongs, according to the idea of the present invention, several simple deductions, deformations or substitutions can also be made.

Claims

1. A blood oxygen control circuit, characterized in that: include: A constant current control input module obtains an input signal, filters the input signal, and outputs an input signal at a set frequency; A constant current control module, connected to the constant current control input module, outputs a constant current according to the input signal at the set frequency; A control input module is used to obtain an on signal or an off signal; A photoelectric controller is connected to the constant current control module and the control input module; the photoelectric controller includes an infrared light-emitting device and an infrared receiving device, and the photoelectric controller obtains the constant current to maintain the stable operation of the infrared light-emitting device and the infrared receiving device. The infrared light-emitting device and the infrared receiving device turn on and off accordingly in response to the on-signal or off-signal.

2. The blood oxygen control circuit according to claim 1, characterized in that: The constant current control input module adopts a second-order passive bandpass filter.

3. The blood oxygen control circuit according to claim 2, characterized in that: The second-order passive bandpass filter comprises a resistor R1, a resistor R2, a capacitor C1 and a capacitor C2; The first end of the capacitor C1 is used to obtain an input signal, the second end of the capacitor C1 is connected to the resistor R1, the second end of the resistor R1 is connected to the first end of the resistor R2, and the second end of the resistor R2 is grounded; the second end of the resistor R1 is also connected to the first end of the capacitor C2, and the second end of the capacitor C2 is grounded; the second end of the resistor R1 is used to output the input signal at a set frequency.

4. The blood oxygen control circuit according to claim 1, characterized in that: The constant current control module includes an amplifier U1, a resistor R3, a resistor R4 and a switch tube Q1; The in-phase input terminal of the amplifier U1 is used to connect to the constant current control input module, the inverting input terminal of the amplifier U1 is connected to the first end of the resistor R3, the second end of the resistor R3 is grounded, the output terminal of the amplifier U1 is connected to the first end of the resistor R4, the second end of the resistor R4 is connected to the control end of the switch tube Q1, the first end of the switch tube Q1 is used to output a constant current, and the second end of the switch tube Q1 is connected to the first end of the resistor R3.

5. The blood oxygen control circuit according to claim 1, characterized in that: The control input module adopts a first-order passive low-pass filter.

6. The blood oxygen control circuit as claimed in claim 5, characterized in that: The first-order passive low-pass filter comprises a resistor R5, a resistor R6, a capacitor C4 and a capacitor C5; The first end of the resistor R5 is used to obtain a turn-on signal or a turn-off signal, the second end of the resistor R5 is used to connect to a photoelectric controller, the second end of the resistor R5 is also connected to the first end of the capacitor C4, and the second end of the capacitor C4 is grounded; the first end of the resistor R6 is used to obtain a turn-on signal or a turn-off signal, the second end of the resistor R6 is used to connect to a photoelectric controller, the second end of the resistor R6 is also connected to the first end of the capacitor C5, and the second end of the capacitor C5 is grounded.

7. The blood oxygen control circuit according to claim 1, characterized in that: The photoelectric controller also includes a first analog switch chip, a second analog switch chip, and a capacitor C3; The first data port of the first analog switch chip is used to connect the constant current control module, and the first data port of the second analog switch chip is used to connect the constant current control module; the ground port of the first analog switch chip is grounded, and the ground port of the second analog switch chip is grounded; the second data port of the first analog switch chip is used to connect the working power supply, and the second data port of the second analog switch chip is used to connect the working power supply; the control port of the first analog switch chip is used to connect the control input module, and the control port of the second analog switch chip is used to connect the control input module; the power port of the first analog switch chip is used to connect the working power supply, and the power port of the second analog switch chip is used to connect the working power supply; the third data port of the first analog switch chip is connected to the first end of the capacitor C3, and the second end of the capacitor C3 is connected to the third data port of the second analog switch chip; the third data port of the first analog switch chip is also connected to the output end of the infrared light-emitting device, and the input end of the infrared light-emitting device is connected to the third data port of the second analog switch chip; the third data port of the first analog switch chip is also connected to the input end of the infrared receiving device, and the output end of the infrared receiving device is connected to the third data port of the second analog switch chip.

8. The blood oxygen control circuit as claimed in claim 7, characterized in that: The first analog switch chip and the second analog switch chip are both FSA4157P6X chips.

9. The blood oxygen control circuit according to claim 1, characterized in that: The infrared light emitting device is an infrared light emitting tube, and the infrared receiving device is a red light emitting tube.

10. A monitor, characterized in that: Comprising the blood oxygen control circuit as described in any one of claims 1-9.

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