Integrated chip for detecting human body heart rate in photoelectric mode

Abstract

The invention provides an integrated chip for detecting the human body heart rate in a photoelectric mode. The integrated chip comprises a light-emitting diode driving circuit, a photoelectric converter, a current-voltage conversion circuit, an analog-digital conversion circuit and a digital signal processing circuit. The light-emitting diode driving circuit is connected with light-emitting diodes, the output end of the photoelectric converter is connected with the current-voltage conversion circuit, the output end of the current-voltage conversion circuit is connected with the analog-digital conversion circuit, and the output end of the analog-digital conversion circuit is connected with the digital signal processing circuit. The integrated chip has the advantages that a traditional amplification and filtering circuit is abandoned, the structure is simpler, power consumption is lower, the area and power consumption of the circuits are greatly reduced, and miniaturization of equipment is facilitated. The photoelectric mode is different from a light-frequency conversion mode, the signal range and the signal to noise ratio are increased through the analog-digital conversion circuit, and the individual variation of human bodies are considered.

Description

technical field [0001] The invention relates to detection equipment, in particular to an integrated chip for detecting human heart rate by means of photoelectricity. Background technique [0002] Mobile health and personal portable medical monitoring are one of the important components of my country's future medical and health system. Being able to continuously monitor individuals for a long time, and to be able to detect sudden illnesses or abnormal physiological conditions of the wards in a timely manner will be one of the important requirements for the development of medical and health services in the future. The real-time and universality of this application requires that this new monitoring system should have the characteristics of portability, miniaturization, integration and low power consumption. [0003] At present, the photoelectric heart rate meter adopts a separate circuit board-level circuit, and the light change received by transmission or reflection is conver...

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Problems solved by technology

[0003] At present, the photoelectric heart rate meter adopts a separate circuit board-level circuit, and the light change received by transmission or reflection is converted into an electrical pulse signal, which is processed by a current-voltage conversion circuit, an amplification circuit, and a low-pass filter circuit to obtain a volumetric pulse wave signal. and other processing to obtain the heart rate value; this method has complex analog circuits and a large board-level occupation area, which is not convenient for miniaturization and integration of equipment

There is also a digital photoelectric heart rate measurement method, using the light-frequency conversion method, using the light-frequency converter to convert the received light signal into an electrical pulse signal whose frequency is proportional to the light intensity, and performing frequency technology on the pulse signal and digital Signal processing to obtain the heart rate value; however, the frequency range of the currently available optical-frequency converter is below 1MHz. To allow the frequency technology to achieve the required resolution, it is necessary to automatically adjust the driving current of the light-emitting tube, so that for any thickness of human tissue , the output pulse of the light-frequency converter has sufficient pulse width to maintain the accuracy of period measurement, but to do this, when the tissue thickness is thin, the driving current and the light pulse intensity will be adjusted to a small value, which will cause signal noise lower than serious

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