CN104573317A - Photoelectric health parameter detector based on audio port - Google Patents

Abstract

The invention provides a photoelectric health parameter detector based on an audio interface, including an audio interface, a power supply resonant circuit, a receiving resonant circuit, a signal receiving circuit, an energy storage circuit, an electronic switch circuit, a single-chip microcomputer, a voltage regulation circuit, and an H-bridge circuit , infrared light-emitting diode, red light-emitting diode, photodiode and operational amplifier circuit; the signal receiving circuit is used to convert the resonant waveform signal output by the receiving resonant circuit into a square wave pulse signal recognized by the single-chip microcomputer; The control signal sent by the H-bridge power supply control signal output terminal changes the output voltage value of the controllable voltage output terminal of the voltage regulation circuit; the operational amplifier circuit is used to amplify the acquisition signal sent by the signal output terminal of the photodiode. The detector has a low bit error rate, high universality, and does not need its own power supply, so it has a high market application prospect.

Description

A photoelectric health parameter detector based on audio port

technical field

The invention relates to a photoelectric health parameter detector, in particular to a photoelectric health parameter detector based on an audio port.

Background technique

With the advancement of economy and technology, smart mobile terminal devices such as mobile phones, PDA devices, and tablet computers are more and more closely related to people's lives. At the same time, its performance and functions are getting stronger and stronger. There are more and more peripheral devices and applications related to it. On the one hand, these peripheral devices need to communicate with smart mobile terminals. On the other hand, for some low-power devices, it is also hoped that the power supply can be taken into account to avoid the loss and cost increase caused by the need for external batteries. The current communication methods of peripheral devices and mobile terminals mainly include the following methods: 1) Wireless communication, mainly using Bluetooth technology, WiFi, second-generation and third-generation communication technologies. The advantage is that the communication technology is mature and the scope of application is wide. 2) Use the USB port of the mobile phone for communication, but at present most mobile phones still do not support the OTG protocol, and cannot control peripheral devices through the USB port of the mobile phone; 3) Use the audio port for communication, using the most Lakala equipment is widely used, which uses analog signals, has a high communication bit error rate, and does not support all mobile phones. Wireless communication cannot provide terminal power, and USB has different interface forms for different mobile phones, making it difficult for peripheral devices to adapt to all smart mobile terminals. The only feasible way is to use the audio port for communication and power supply. However, a complete set of solutions for communication and power supply using the audio port has not yet been seen.

Contents of the invention

The technical problem to be solved by the present invention is that in the prior art, the bit error rate of the audio port communication is high, the universality is low, and the peripheral equipment cannot be powered.

In order to solve the above-mentioned technical problems, the present invention provides a photoelectric health parameter detector based on an audio interface, including an audio interface, a power supply resonant circuit, a receiving resonant circuit, a signal receiving circuit, an energy storage circuit, an electronic switch circuit, a single-chip microcomputer, a voltage Adjusting circuit, H bridge circuit, infrared light emitting diode, red light emitting diode, photodiode and operational amplifier circuit; the audio interface is composed of left channel line, right channel line and microphone line, and the left channel line and power supply resonant circuit The resonant signal input end is connected, the right channel line is connected with the resonant signal input end of the receiving resonant circuit, the microphone line is connected with the data sending port of the single chip microcomputer; the resonant signal output end of the power supply resonant circuit is connected with the electric energy input end of the energy storage circuit, and the receiving end The resonant signal output end of the resonant circuit is respectively connected with the electric energy input end of the energy storage circuit and the signal input end of the signal receiving circuit; the signal output end of the signal receiving circuit is connected with the signal input port of the single-chip microcomputer; The input terminal of the switch circuit and the power supply terminal of the single-chip microcomputer are connected with each other, the control terminal of the electronic switch circuit is connected with the switch control signal output port of the single-chip microcomputer, and the output terminal of the electronic switch circuit is respectively connected with the power supply terminal of the voltage regulation circuit and the high-voltage terminal of the H-bridge circuit. And the power supply terminal of the operational amplifier circuit is connected; the control signal terminal of the voltage regulation circuit is connected with the H bridge power supply control signal output terminal of the single chip microcomputer, and the controllable voltage output terminal of the voltage regulation circuit is connected with the low voltage terminal of the H bridge circuit; the infrared light emitting diode It is connected in series with the red light-emitting diode on the middle beam of the H-bridge circuit, and the bias polarity of the infrared light-emitting diode and the red light-emitting diode is opposite; the bridge conduction signal input terminal of the H-bridge circuit is conducted with the bridge circuit of the microcontroller The signal output port is connected; the signal output end of the photodiode is connected with the signal input end of the operational amplifier circuit, and the signal output end of the operational amplifier circuit is connected with the signal acquisition port of the single-chip microcomputer;

The signal receiving circuit is used to convert the resonant waveform signal output by the receiving resonant circuit into a square wave pulse signal recognized by the single-chip microcomputer; the H-bridge circuit has only one set of two diagonal bridges conducting at the same time; The control signal sent by the control signal output end of the H-bridge power supply changes the output voltage value of the controllable voltage output end of the voltage regulation circuit; The optical signal sent by the light-emitting diode; the operational amplifier circuit is used to amplify and process the acquisition signal sent by the signal output end of the photodiode.

The power supply resonant circuit is used to receive the frequency signal transmitted by the left channel, which can provide electric energy for the energy storage circuit for storage, thereby further providing sufficient power demand for other circuits of the detector, and the detector itself does not have a power supply, which effectively reduces the detection The volume and cost of use of the instrument; the receiving resonant circuit is used to receive the frequency signal transmitted by the right channel, and it can also provide electric energy for the energy storage circuit for storage when the signal is not received, which further improves the charging efficiency of the energy storage circuit. The detection time shortens the charging time, prolongs the collection time of blood oxygen data, enhances the data collection success rate of the detector, and shortens the detection cycle; the single-chip microcomputer is used to control the on-off of the electronic switch circuit, which can be cut off in time after the data collection is completed. The power supply of the main power consumption circuit, so that the detector enters the dormant state, effectively saves the loss of electric energy, and improves the single charge utilization rate of the energy storage circuit; the signal receiving circuit can convert the resonant waveform signal output by the receiving resonant circuit into The single-chip microcomputer can recognize the square wave pulse signal, so that the right channel has both the charging function and the signal transmission function, which improves the utilization rate of the audio port hardware; the infrared light-emitting diode and the red light-emitting diode are biased in opposite polarity Connected in series on the middle beam of the H-bridge circuit, it can ensure that only one light-emitting diode can emit light at the same time. At the same time, it can also prevent two light-emitting diodes from being on at the same time from the hardware design; The signal is amplified and processed so that the A/D end of the single-chip microcomputer can be effectively collected.

As a further improvement of the present invention, a voltage division detection circuit is also included, the high voltage end of the voltage division detection circuit is connected to the electric energy output end of the energy storage circuit, and the voltage division end of the voltage division detection circuit is connected to the voltage sampling port of the single-chip microcomputer. The voltage value of the energy storage circuit can be detected in real time by using the voltage division detection circuit, so that the single-chip microcomputer sends a frequency adjustment request to the external mobile device connected to the audio port through the microphone line, and the mobile device sends an audio signal of the corresponding frequency according to the frequency adjustment request to make the power supply The resonant circuit obtains the best resonance effect, so that the energy storage circuit further obtains electric energy of sufficient voltage.

As a further improvement of the present invention, an alarm is also included, and the alarm is connected with the alarm signal output end of the single-chip microcomputer. Because the audio port of the external mobile device is occupied during the docking detection process with the detector, it often does not have the sound alarm function, especially mobile devices such as mobile phones, when the audio port is occupied, the external speaker will be automatically set to mute, so It is especially important to set the alarm on the detector.

As a further limiting solution of the present invention, the power supply resonant circuit includes an oscillating capacitor C2, an oscillating capacitor C4, and an oscillating inductance L1. The oscillating capacitor C2 and the oscillating capacitor C4 are connected in parallel with the oscillating inductor L1 after being connected in series. The resonance signal input end of the power supply resonant circuit is located at the oscillation The junction of the capacitor C2 and the oscillating capacitor C4; one end of the oscillating inductor L1 is grounded, and the other end is the resonant signal output end of the power supply resonant circuit. The use of the power supply resonant circuit can effectively improve the resonant effect of the frequency signal received by the left channel, thereby successfully charging the energy storage circuit.

As a further improvement of the present invention, a voltage regulator tube D1 is provided between the resonance signal output end of the power supply resonance circuit and the energy input end of the energy storage circuit, and the positive pole of the voltage regulator tube D1 is connected to the resonance signal output end of the power supply resonance circuit. The negative electrode of the regulator tube D1 is connected to the electric energy input end of the energy storage circuit. The use of the regulator tube D1 can stabilize the resonant signal output from the resonant signal output end of the power supply resonant circuit, further improving the charging effect of the energy storage circuit.

As a further limiting solution of the present invention, the receiving resonant circuit includes an oscillating capacitor C5, an oscillating capacitor C6, and an oscillating inductance L2. The oscillating capacitor C5 and the oscillating capacitor C6 are connected in parallel with the oscillating inductor L2 after being connected in series. The resonant signal input terminal of the receiving resonant circuit is located at the oscillation The junction of the capacitor C5 and the oscillating capacitor C6; one end of the oscillating inductance L2 is grounded, and the other end is the output end of the resonant signal receiving resonant circuit. The use of the receiving resonance circuit can effectively improve the resonance effect of the frequency signal received by the right channel, thereby successfully charging the energy storage circuit.

As a further improvement of the present invention, a voltage regulator tube D2 is provided between the resonance signal input end of the receiving resonant circuit and the energy input end of the energy storage circuit, and the positive pole of the voltage regulator tube D2 is connected to the resonance signal output end of the receiving resonance circuit. The negative pole of the regulator tube D2 is connected to the electric energy input end of the energy storage circuit. The use of the regulator tube D2 can smoothly process the resonant signal output from the resonant signal output end of the receiving resonant circuit, further improving the charging effect of the energy storage circuit.

As a further limiting solution of the present invention, the signal receiving circuit includes a detection diode D3, a capacitor C7 and a resistor R8, the positive pole of the detection diode D3 is connected to the output terminal of the resonance signal of the receiving resonant circuit, and the negative pole of the detection diode D3 is connected to the signal input port of the single-chip microcomputer ; One end of the capacitor C7 is connected to the negative pole of the detection diode D3, and the other end is grounded; one end of the resistor R8 is connected to the negative pole of the detection diode D3, and the other end is grounded. The detection diode D3 is used for detection to realize the smooth processing of the resonance signal output from the resonance signal output end of the receiving resonance circuit, and then the high-frequency part is filtered through the RC circuit composed of the capacitor C7 and the resistor R8.

As a further limiting scheme of the present invention, a voltage adaptation circuit is also provided between the microphone line and the data transmission port of the microcontroller, and the voltage adaptation circuit includes a pull-down resistor R7, an adaptation resistor R5 and an adaptation resistor R6; the resistance of the adaptation resistor R5 is greater than the adaptation resistor The resistance value of R6; the adaptation resistor R5 is connected to one end of the adaptation resistance R6 and then connected to the microphone line, and the other end of the adaptation resistance R5 and the adaptation resistance R6 are respectively connected to different data sending ports of the MCU; The other end of the junction of the resistor R5 and the adaptive resistor R6 is grounded. An adaptation resistor R5 or an adaptation resistor R6 is set between the microphone line and the data transmission port of the single-chip microcomputer, which can enable the single-chip microcomputer to select a suitable transmission port for signal transmission according to the level requirements of the connected external mobile device, and improve the adaptability of the detector.

As a further limiting solution of the present invention, the voltage regulating circuit includes a resistor R16, a resistor R19, a resistor R20, a transistor Q6, and a transistor Q7; One end is connected, the base of the transistor Q6 is connected with the collector of the transistor Q7; the collector of the transistor Q7 is also connected with one end of the resistor R16, the emitter of the transistor Q7 is grounded, the base of the transistor Q7 is output with the H-bridge power supply control signal of the microcontroller The other end of the resistor R16 is connected to the output end of the electronic switch circuit; the other end of the resistor R19 is grounded; one end of the resistor R20 is connected to the base of the transistor Q7, and the other end of the resistor R20 is grounded; the transistor Q6 is an NPN transistor. The transistor Q7 is a PNP transistor. Using the single-chip microcomputer to send square wave signals of different frequencies to control the on-off of the triode Q7, so that the controllable voltage output terminal of the voltage regulation circuit can output a controllable voltage value, so that there is a controllable voltage between the high-voltage terminal and the low-voltage terminal of the H-bridge circuit. The controlled voltage drop makes the voltage value loaded on the infrared light-emitting diode and the red light-emitting diode controllable, so as to cope with different users and improve the universality of the detector.

The beneficial effects of the present invention are: (1) adopting the power supply resonant circuit to receive the frequency signal transmitted by the left channel can provide electric energy for the energy storage circuit for storage, thereby further providing enough electric energy demand for other circuits of the detector, and the detector It does not have a power source, which effectively reduces the size and cost of the detector; (2) The receiving resonant circuit is used to receive the frequency signal transmitted by the right channel, and it can also provide electric energy for the energy storage circuit for storage when the signal is not receiving , further improving the charging efficiency of the energy storage circuit, shortening the charging time within a limited detection time, prolonging the collection time of blood oxygen data, enhancing the success rate of data collection of the detector, and shortening the detection cycle; (3) using a single-chip microcomputer Controlling the on-off of the electronic switch circuit can cut off the power supply of the main power-consuming circuit in time after the data collection is completed, so that the detector enters a dormant state, which effectively saves the loss of electric energy and improves the single-charge utilization rate of the energy storage circuit; (4) The signal receiving circuit can convert the resonant waveform signal output by the receiving resonant circuit into a square wave pulse signal recognizable by the single-chip microcomputer, so that the right channel has both charging function and signal transmission function, and improves the utilization of audio port hardware (5) The infrared light-emitting diode and the red light-emitting diode are connected in series on the middle beam of the H-bridge circuit with opposite bias polarity, which can ensure that only one light-emitting diode can emit light at the same time. In terms of hardware design, two light-emitting diodes are prevented from being bright at the same time; (6) The signal collected by the photodiode can be amplified by using an operational amplifier circuit, so that the A/D terminal of the single-chip microcomputer can be effectively collected.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic diagram of the connection structure of the audio port circuit of the present invention;

Fig. 3 is the structural representation of H bridge circuit and voltage regulating circuit of the present invention;

Fig. 4 is the operational amplifier circuit structure schematic diagram of the present invention;

Fig. 5 is a schematic diagram of the port of the single-chip microcomputer of the present invention;

Fig. 6 is a schematic structural diagram of a voltage division detection circuit of the present invention;

Fig. 7 is the resonant signal output by the receiving resonant circuit of the present invention;

FIG. 8 is a square wave pulse signal obtained after processing by the signal receiving circuit of the present invention.

Detailed ways

As shown in Figure 1, the present invention provides a photoelectric health parameter detector based on an audio port, including an audio port, a power supply resonant circuit 1, a receiving resonant circuit 3, a signal receiving circuit 5, an energy storage circuit 2, and an electronic switch circuit 6. Single-chip microcomputer 10, voltage regulation circuit 8, H-bridge circuit 7, infrared light-emitting diode, red light-emitting diode, photodiode and operational amplifier circuit 9; the audio interface is composed of left channel line, right channel line and microphone line, The left channel line is connected with the resonance signal input end of the power supply resonance circuit 1, the right channel line is connected with the resonance signal input end of the receiving resonance circuit 3, and the microphone line is connected with the data sending port of the single-chip microcomputer 10; the resonance signal of the power supply resonance circuit 1 The output end is connected with the power input end of the energy storage circuit 2, and the resonance signal output end of the receiving resonant circuit 3 is respectively connected with the power input end of the energy storage circuit 2 and the signal input end of the signal receiving circuit 5; the signal output of the signal receiving circuit 5 terminal is connected with the signal input port of the single-chip microcomputer 10; the electric energy output terminal of the energy storage circuit 2 is connected with the input terminal of the electronic switch circuit 6 and the power supply terminal of the single-chip microcomputer 10; the control terminal of the electronic switch circuit 6 is connected with the switch control signal output of the single-chip microcomputer 10 Ports are connected, and the output terminal of electronic switch circuit 6 is connected with the power supply terminal of voltage regulating circuit 8, the high voltage terminal of H bridge circuit 7 and the power supply terminal of operational amplifier circuit 9 respectively; The control signal terminal of voltage regulating circuit 8 is connected with the H The control signal output end of the bridge power supply is connected, and the controllable voltage output end of the voltage regulating circuit 8 is connected with the low voltage end of the H bridge circuit 7; The bias polarity of the light emitting diode and the red light emitting diode is opposite; the bridge conduction signal input end of the H bridge circuit 7 is connected with the bridge conduction signal output port of the single chip microcomputer 10; the signal output end of the photodiode is connected with the operational amplifier circuit The signal input end of 9 is connected, and the signal output end of operational amplifier circuit 9 is connected with the signal acquisition port of single-chip microcomputer 10;

The signal receiving circuit 5 is used to convert the resonant waveform signal output by the receiving resonant circuit 3 into a square wave pulse signal recognized by the single-chip microcomputer 10; the H-bridge circuit 7 has only two bridges of a group of diagonals conducting at the same time; the voltage regulation circuit 8 is used to change the output voltage value of the controllable voltage output terminal of the voltage regulation circuit 8 according to the control signal sent by the H-bridge power supply control signal output terminal of the single-chip microcomputer 10; the photodiode is facing the infrared light emitting diode and the red light emitting diode for collecting The optical signal sent by the infrared light emitting diode and the red light emitting diode; the operational amplifier circuit 9 is used to amplify and process the acquisition signal sent by the signal output end of the photodiode.

In order to adjust the voltage of the energy storage circuit 2 in real time according to the actual detection voltage, so that the voltage of the energy storage circuit 2 can meet the electric energy of the energy consumption circuit of the detector, the present invention also includes a voltage division detection circuit 11, and the voltage division detection circuit 11 The high voltage terminal is connected to the electric energy output terminal of the energy storage circuit 2 , and the voltage dividing terminal of the voltage dividing detection circuit 11 is connected to the voltage sampling port of the single chip microcomputer 10 . Using the voltage division detection circuit 11 can detect the voltage value of the energy storage circuit 2 in real time, so that the single-chip microcomputer 10 sends a frequency adjustment request to the external mobile device docked with the audio port through the microphone line, and the mobile device sends an audio signal of a corresponding frequency according to the frequency adjustment request. , so that the power supply resonant circuit 1 can obtain the best resonance effect, so that the energy storage circuit 2 can further obtain electric energy of sufficient voltage.

In order to enable the detector to have an independent alarm function, the present invention also includes an alarm, which is connected to the alarm signal output end of the single-chip microcomputer 10 . Because the audio port of the external mobile device is occupied during the docking detection process with the detector, it often does not have the sound alarm function, especially mobile devices such as mobile phones, when the audio port is occupied, the external speaker will be automatically set to mute, so It is especially important to set the alarm on the detector.

Electronic switch circuit 6 of the present invention comprises resistance R1, resistance R3 and MOS transistor Q1, and one end of resistance R1 is connected with the gate of MOS transistor Q1, and the other end of resistance R1 is connected with the switch control signal output port IRC0 of single-chip microcomputer 10, and resistance R3 Connected between the gate and the source of the MOS transistor Q1, the output of the drain of the MOS transistor Q1 is a voltage source of VAA.

As shown in Figure 2, the power supply resonant circuit 1 of the present invention includes an oscillating capacitor C2, an oscillating capacitor C4, and an oscillating inductance L1. It is located at the junction of the oscillation capacitor C2 and the oscillation capacitor C4; one end of the oscillation inductor L1 is grounded, and the other end is the output end of the resonance signal of the power supply resonant circuit. The power supply resonant circuit 1 amplifies the amplitude of the frequency signal received by the left channel by 50 to 200 times. The use of the power supply resonance circuit 1 can effectively improve the resonance effect of the frequency signal received by the left channel, thereby successfully charging the energy storage circuit.

In order to further improve the charging effect of the energy storage circuit 2, a voltage regulator tube D1 is arranged between the resonance signal output end of the power supply resonant circuit 1 of the present invention and the electric energy input end of the energy storage circuit, and the positive pole of the voltage regulator tube D1 is connected to the power supply resonant circuit. The resonant signal output terminal of the voltage regulator tube D1 is connected to the output terminal of the electric energy of the energy storage circuit. The use of the regulator tube D1 can stabilize the resonant signal output from the resonant signal output end of the power supply resonant circuit 1 , further improving the charging effect of the energy storage circuit 2 .

The receiving resonant circuit 3 of the present invention includes an oscillating capacitor C5, an oscillating capacitor C6, and an oscillating inductance L2. The oscillating capacitor C5 and the oscillating capacitor C6 are connected in parallel with the oscillating inductance L2 after being connected in series. The connection of the capacitor C6; one end of the oscillating inductance L2 is grounded, and the other end is the resonant signal output end of the receiving resonant circuit. The receiving resonant circuit 3 amplifies the frequency signal received by the right channel by a multiple of 50-200. The use of the receiving resonance circuit 3 can effectively improve the resonance effect of the frequency signal received by the right channel, thereby successfully charging the energy storage circuit 2 .

In order to further improve the charging effect of the energy storage circuit 2, a voltage regulator tube D2 is arranged between the resonance signal input end of the receiving resonant circuit of the present invention and the electric energy input end of the energy storage circuit, and the positive pole of the voltage regulator tube D2 is connected to the receiving resonance circuit. The resonant signal output terminal is connected, and the negative electrode of the regulator tube D2 is connected with the electric energy input terminal of the energy storage circuit. The use of the voltage regulator tube D2 can smoothly process the resonance signal output from the resonance signal output end of the receiving resonance circuit 3 , further improving the charging effect of the energy storage circuit 2 .

As shown in Figures 1, 7 and 8, the signal receiving circuit 5 of the present invention includes a detection diode D3, a capacitor C7 and a resistor R8, the positive pole of the detection diode D3 is connected with the resonant signal output end of the receiving resonant circuit, and the negative terminal of the detection diode D3 It is connected with the signal input port RXD of the single-chip microcomputer; one end of the capacitor C7 is connected with the cathode of the detection diode D3, and the other end is grounded; one end of the resistor R8 is connected with the cathode of the detection diode D3, and the other end is grounded. Use the detection diode D3 to detect the resonance signal as shown in Figure 6, realize the smooth processing of the resonance signal output by the resonance signal output end of the receiving resonance circuit 5, and then perform high frequency through the RC circuit composed of the capacitor C7 and the resistor R8. Partial filtering finally obtains a square wave pulse signal as shown in Figure 8, assuming that the time constant of the RC circuit is τ, the audio frequency after resonance is f ₁ , and the frequency of the signal received by the single-chip microcomputer 10 is f ₂ , then the time constant τ is required Satisfying: f ₁ <1/τ<<f ₂ , setting the time constant τ of the RC circuit within this range can effectively prevent transmission failure or transmission error.

In order to further improve the universality of the detector, the present invention is also provided with a voltage adaptation circuit 4 between the data transmission port of the microphone circuit and the single-chip microcomputer 10, and the voltage adaptation circuit 4 includes a pull-down resistor R7, an adaptation resistor R5 and an adaptation resistor R6; The resistance value of the resistor R5 is greater than the resistance value of the adaptive resistor R6; one end of the adaptive resistor R5 is connected to the adaptive resistor R6 and then connected to the microphone line, and the other ends P0.1 and P0.2 of the adaptive resistor R5 and the adaptive resistor R6 are respectively connected to Different data sending ports P0.1 and P0.2 of the single-chip microcomputer; one end of the pull-down resistor R7 is connected to the junction of the adaptation resistor R5 and the adaptation resistor R6, and the other end is grounded. An adaptation resistor R5 or an adaptation resistor R6 is set between the microphone line and the data transmission port of the single-chip microcomputer, which can enable the single-chip microcomputer to select a suitable transmission port for signal transmission according to the level requirements of the connected external mobile device, and improve the adaptability of the detector.

As shown in Figure 3, the H-bridge circuit of the present invention is a commonly used H-bridge circuit, including four symmetrical bridge circuits. The other end of R16 is connected, and the positive pole LED+ of the infrared light-emitting diode and the positive pole IR+ of the red light-emitting diode are connected to the middle crossbeam of the H-bridge circuit. The bridge conduction signal output port IRO0 of the two bridges on the right is connected to the bridge conduction signal output port IRO1 of the single-chip microcomputer 10 .

The voltage regulating circuit 8 of the present invention comprises resistor R16, resistor R19, resistor R20, transistor Q6 and transistor Q7; The base of Q6 is connected to the collector of transistor Q7; the collector of transistor Q7 is also connected to one end of resistor R16, the emitter of transistor Q7 is grounded, and the base of transistor Q7 is connected to the H-bridge power supply control signal output terminal IDA of the single-chip microcomputer; The other end of the resistor R16 is connected to the output terminal VAA of the electronic switch circuit; the other end of the resistor R19 is grounded; one end of the resistor R20 is connected to the base of the transistor Q7, and the other end of the resistor R20 is grounded; the transistor Q6 is an NPN transistor, and the transistor Q7 It is a PNP transistor. The single-chip microcomputer 10 is used to send square wave signals of different frequencies to control the on-off of the triode Q7, so that the controllable voltage output terminal of the voltage regulation circuit 8 outputs a controllable voltage value, thereby making the connection between the high-voltage end and the low-voltage end of the H-bridge circuit 7 Presenting a controllable voltage drop, the voltage value loaded on the infrared light-emitting diode and the red light-emitting diode can be controlled, so as to cope with different users and improve the universality of the detector.

As shown in Figure 4, the operational amplifier circuit 9 of the present invention is a common operational amplifier circuit, which is used to amplify the acquisition signal of the photodiode by 8 to 10 times, wherein PHO+ and PHO- are respectively connected to the positive and negative poles of the photodiode , the signal output end is connected with the signal acquisition port ADC1 of the single-chip microcomputer 10, the VAA voltage is provided by the output end of the electronic switch circuit 6, the VDD voltage is connected with the DVV port of the single-chip microcomputer 10, and the multiple of the photodiode acquisition signal amplified by the operational amplifier circuit 9 is 50 ~150.

As shown in Figure 5, single-chip microcomputer 10 of the present invention is the microprocessor with A/D sampling function, is provided with switch control signal output port IRC0, signal input port RXD, data transmission port P0.1, data transmission on single-chip microcomputer 10 Port P0.2, bridge conduction signal output port IRO0, bridge conduction signal output port IRO1, H-bridge power supply control signal output terminal IDA, signal acquisition port ADC1, voltage sampling port ADC0, and DVV port.

As shown in Figure 6, the divided voltage detection circuit 11 of the present invention comprises a voltage divided resistor R2 and a resistor R4 connected in series between the electric energy output terminal of the energy storage circuit 2 and the ground, and the voltage sampling port ADC0 of the single-chip microcomputer is connected between the resistor R2 and the resistor R4. connection between resistor R4.

When the photoelectric health parameter detector of the present invention is working, an external mobile device is first connected to the detector through an audio interface, and a wake-up signal is sent to the single-chip microcomputer 10 through the right sound channel, and then the mobile device passes the left sound channel and the right sound The channel sends audio signals of mobile frequencies to the power supply resonant circuit 1 and the receiving resonant circuit 3, and the power supply resonant circuit 1 and the receiving resonant circuit 3 carry out resonant amplification, and then pass through the voltage regulator tube D1 and the voltage regulator tube D2 respectively to the energy storage circuit 2 The energy storage capacitor C1 is charged, and at the same time, the voltage division detection circuit 11 collects the voltage of the energy storage capacitor C1 in real time. If the voltage of the energy storage capacitor C1 has not reached the set working voltage, the single chip microcomputer 10 sends the data through the data transmission port P0.1 Audio frequency conversion information. At this time, if the voltage does not change after the data transmission port P0.1 is sent, then the audio frequency conversion information is sent through the data transmission port P0.2. After the external mobile device increases the audio frequency, the voltage division detection circuit 11 Collect the voltage of the energy storage capacitor C1 until the working voltage requirement is met, and after reaching the working voltage, the single-chip microcomputer 10 sends a charging completion signal to the mobile device through the microphone line, and then the mobile device connects to the signal receiving circuit 5 through the right channel Single-chip microcomputer sends collection order, and at this moment, left sound channel is still in charging state, will enter charging state again after right sound channel transmission completes collection order; When carrying out data collection, at first by single-chip microcomputer 10 control electronic switch circuit 6 and send connection order , turn on the power supply of the voltage regulating circuit 8, the H bridge circuit 7 and the op amp circuit 9, and then the single chip microcomputer 10 controls the alternate on-off of the diagonal bridge circuit of the H bridge circuit 7, so that the infrared light emitting diode and the red light emitting diode emit light alternately , and then the photodiode collects the optical signal in real time, and then completes the amplification of the signal through the operational amplifier circuit 9 for the single-chip microcomputer 10 to collect, and finally the single-chip microcomputer 10 sends the collected signal to the external mobile device through the microphone line, and thus completes the blood oxygen data. Acquisition, after the collection of all blood oxygen data is completed, the single-chip microcomputer 10 sends a disconnection command to the electronic switch circuit 6, and the power supply of the voltage regulation circuit 8, the H-bridge circuit 7 and the operational amplifier circuit 9 is disconnected, and the single-chip microcomputer 10 also enters the low-power mode at the same time. consumption mode.

Claims (10)

1. A photoelectric type health parameter detector based on audio interface, it is characterized in that: comprise audio interface, power supply resonant circuit, receive resonant circuit, signal receiving circuit, energy storage circuit, electronic switch circuit, single-chip microcomputer, voltage regulating circuit, H Bridge circuit, infrared light emitting diode, red light emitting diode, photodiode and operational amplifier circuit; the audio interface is made up of left sound channel line, right sound channel line and microphone line, and the left sound channel line and power supply resonant circuit The resonance signal input end is connected, the right channel line is connected with the resonance signal input end of the receiving resonance circuit, and the microphone line is connected with the data sending port of the single-chip microcomputer; the resonance signal output end of the power supply resonance circuit is connected with the energy storage circuit The electric energy input end is connected, and the resonant signal output end of the receiving resonant circuit is connected with the electric energy input end of the energy storage circuit and the signal input end of the signal receiving circuit respectively; The signal output end of the signal receiving circuit is connected with the signal input port of the single-chip microcomputer ; The power output end of the energy storage circuit is connected with the input end of the electronic switch circuit and the power supply end of the single-chip microcomputer, the control end of the electronic switch circuit is connected with the switch control signal output port of the single-chip microcomputer, and the output of the electronic switch circuit Terminals are respectively connected with the power supply terminal of the voltage regulating circuit, the high voltage terminal of the H bridge circuit and the power supply terminal of the operational amplifier circuit; The controllable voltage output end of the circuit is connected with the low-voltage end of the H-bridge circuit; the infrared light-emitting diode and the red light-emitting diode are connected in series on the middle beam of the H-bridge circuit, and the bias of the infrared light-emitting diode and the red light-emitting diode The polarities are opposite; the bridge conduction signal input end of the H-bridge circuit is connected with the bridge conduction signal output port of the single chip microcomputer; the signal output end of the photodiode is connected with the signal input end of the operational amplifier circuit, and the operational amplifier circuit The signal output terminal of the amplifier circuit is connected with the signal acquisition port of the single-chip microcomputer; The signal receiving circuit is used to convert the resonant waveform signal output by the receiving resonant circuit into a square wave pulse signal recognized by the single-chip microcomputer; the H bridge circuit has only two bridges of one group of diagonals conducting at the same time; the voltage The regulating circuit is used to change the output voltage value of the controllable voltage output terminal of the voltage regulating circuit according to the control signal sent by the H bridge power supply control signal output terminal of the single chip microcomputer; the photodiode is facing the infrared light emitting diode and the red light emitting diode for collecting light signals from infrared light emitting diodes and red light emitting diodes; the operational amplifier circuit is used to amplify and process the collection signals sent by the signal output terminals of the photodiodes. 2. The photoelectric health parameter detector based on the audio port according to claim 1, characterized in that: it also includes a voltage division detection circuit, the high voltage end of the voltage division detection circuit is connected with the electric energy output end of the energy storage circuit, The voltage-dividing end of the voltage-dividing detection circuit is connected with the voltage sampling port of the single-chip microcomputer. 3. The photoelectric health parameter detector based on the audio port according to claim 1, characterized in that: it also includes an alarm, and the alarm is connected to the alarm signal output terminal of the single-chip microcomputer. 4. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: the power supply resonant circuit includes an oscillating capacitor C2, an oscillating capacitor C4, and an oscillating inductance L1, and the oscillating capacitor C2 and the oscillating capacitor C4 are connected in parallel with the oscillating inductance L1 after being connected in series, the resonance signal input end of the power supply resonant circuit is located at the junction of the oscillating capacitor C2 and the oscillating capacitor C4; one end of the oscillating inductance L1 is grounded, and the other end is the power supply resonant circuit The resonant signal output terminal. 5. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: a resonant signal output end of the power supply resonant circuit and an electric energy input end of the energy storage circuit are provided A voltage stabilizing tube D1, the anode of the voltage stabilizing tube D1 is connected to the resonance signal output end of the power supply resonant circuit, and the negative pole of the voltage stabilizing tube D1 is connected to the electric energy input end of the energy storage circuit. 6. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: the receiving resonant circuit includes an oscillating capacitor C5, an oscillating capacitor C6, and an oscillating inductance L2, and the oscillating capacitor C5 and the oscillating capacitor C6 are connected in parallel with the oscillating inductance L2 after being connected in series, the resonant signal input end of the receiving resonant circuit is located at the junction of the oscillating capacitor C5 and the oscillating capacitor C6; one end of the oscillating inductance L2 is grounded, and the other end is the receiving resonant circuit The resonant signal output terminal. 7. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: between the resonant signal input end of the receiving resonant circuit and the electric energy input end of the energy storage circuit A voltage stabilizing tube D2, the anode of the voltage stabilizing tube D2 is connected to the output terminal of the resonance signal receiving the resonant circuit, and the negative pole of the voltage stabilizing tube D2 is connected to the power input terminal of the energy storage circuit. 8. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: the signal receiving circuit includes a detection diode D3, a capacitor C7 and a resistor R8, and the detection diode D3 The positive pole is connected to the resonant signal output end of the receiving resonant circuit, and the negative pole of the detection diode D3 is connected to the signal input port of the single-chip microcomputer; one end of the capacitor C7 is connected to the negative pole of the detection diode D3, and the other end is grounded; One end is connected to the cathode of the detection diode D3, and the other end is grounded. 9. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: a voltage adaptation circuit is also provided between the microphone line and the data transmission port of the single-chip microcomputer, and the voltage The adaptation circuit includes a pull-down resistor R7, an adaptation resistor R5, and an adaptation resistor R6; the resistance value of the adaptation resistor R5 is greater than the resistance value of the adaptation resistor R6; the adaptation resistor R5 is connected to one end of the adaptation resistor R6 and then connected to the microphone line, The other ends of the adaptation resistor R5 and the adaptation resistor R6 are respectively connected to different data sending ports of the microcontroller; one end of the pull-down resistor R7 is connected to the junction of the adaptation resistor R5 and the adaptation resistor R6, and the other end is grounded. 10. The photoelectric health parameter detector based on the audio port according to claim 1, 2 or 3, characterized in that: the voltage regulation circuit includes a resistor R16, a resistor R19, a resistor R20, a transistor Q6 and a transistor Q7; The collector of the triode Q6 is connected to the low voltage end of the H bridge circuit, the emitter of the triode Q6 is connected to one end of the resistor R19, the base of the triode Q6 is connected to the collector of the triode Q7; the collector of the triode Q7 The electrode is also connected to one end of the resistor R16, the emitter of the triode Q7 is grounded, the base of the triode Q7 is connected to the output terminal of the H-bridge power supply control signal of the microcontroller; the other end of the resistor R16 is connected to the output of the electronic switch circuit The other end of the resistor R19 is connected to the ground; one end of the resistor R20 is connected to the base of the transistor Q7, and the other end of the resistor R20 is grounded; the transistor Q6 is an NPN transistor, and the transistor Q7 is a PNP type triode.