The electronic sphygmomanometer has many advantages over the mechanical mercury sphygmomanometer. The measurement and calculation in the design of the sphygmomanometer have been optimized, which improves the accuracy and stability of the system. The sphygmomanometer is portable and easy to use by selecting devices with low power consumption, compact system architecture and user-friendly software design.

1. Introduction

The electronic sphygmomanometer is simpler than the mechanical mercury sphygmomanometer in measuring operation, and is suitable for monitoring blood pressure at any time. Advanced signal processing technology and intelligent control technology are used in the design of sphygmomanometer to improve the accuracy and stability of blood pressure measurement and improve the automation and intelligence of measurement.

2. Selection of microprocessors

The microcontroller is the brain of the entire system, which monitors and processes data, and adjusts hardware parameters by judging measurement results. The system can automatically adjust the working state of the system and has intelligence.

3. Sensor Circuit Design

The output signal of the pressure sensor is first filtered by a filtering circuit and then amplified. At the same time, the microcontroller will generate pulse width to control the sawtooth wave generator. The generated sawtooth wave will be compared with the processed pressure signal, and the level signal will be converted into a pulse width signal, and then converted into the required data through the corresponding operation.

4. Filter circuit design

In the process of blood pressure measurement, if the circuit design is not reasonable, weak signals will be submerged by noise. Therefore, in each amplification circuit, there is a corresponding noise filtering or suppression circuit.

5. Design of Charging and Discharging Control Circuit

The charging and discharging circuit is also an important factor affecting measurement accuracy, and how to control the charging and discharging valves is the key to obtaining measurement results. During the measurement process, the microcontroller controls the action of the inflation and deflation valves based on pressure, which can accurately control the inflation and deflation rate and monitor the operation of the entire system.

The above is the role of hardware in the design of sphygmomanometer. There is also system calibration in the design. There is a special pressure calibration program in the software system to help debug the debugger.