Ward calling system design - based on PLC Medical electronic -

Aiming at the shortcomings of the traditional ward calling system exists, this paper designed a ward calling system based on PLC controller. When patients request medical personnel through keys help ward calling system related request information through power carrier transport to PC system, medical personnel according to the current request message to the corresponding help patients.

1, the system overall scheme and working principle in this paper, according to the actual ward calling system functional requirements for ward calling system hardware circuit design. System hardware circuit is mainly composed of power supply module, a power carrier delivery module, electric power carrier wave receiving module, clock module, data display module, the call button module, serial port module and watchdog module and so on, the whole hardware circuit is shown in figure 1.

figure 1 ward calling system hardware structure diagram

in this paper, we design the system effectively solves the traditional ward calling system structure complicated, difficult construction, and poor ability to scale. When patients need staff to help patients by ward call system will call request information transmission to the appropriate doctor or nurse, doctor or nurse on duty after receive the requested information, give corresponding response, through ward call system stable mood, patient to improve medical service level.

2 ward call hardware circuit, the control system hardware design is mainly composed of the following function modules, power carrier respectively sending module, electric power carrier wave receiving module, power supply module, serial port module, human-computer interaction module, etc.

2。 1 for any a system, power supply module, power module overall stability determines the overall system reliability and stability. Due to the system volume limitation and the actual functional requirements, this paper designed a high-performance switch regulated power supply. The POWER to choose the POWER companies to develop TOP224Y chips as the main control chip, the circuit is shown in figure 2.

figure 2 switching power supply design

switch regulated power supply circuit principle of work is as follows: 220 v ac power through rectifier bridge and filter capacitor output fluctuation of dc power supply, the power supply output directly to drain pin TOP224Y chips, conduction TOP224Y chip, power supply voltage transformers Q20 primary coil and the source form loop, Q20 secondary coil output power supply voltage, at the same time system using the rectifier diode and filter capacitor on the voltage of power supply output rectifier filter processing. In order to guarantee the stability of switch power supply output voltage, this system adopts the transformer secondary coil of the power of the output voltage sampling, when collecting voltage is greater than 12 v, light coupling light conduction, TOP224Y chip close drain pin, thereby reducing switching power supply output voltage size. Because the transformer primary coil has energy storage, its easy to produce in the process of high frequency switch TOP224Y high peak pulse, in order to ensure the normal order of the system can T make the C32 system designed by the R28 resistance, capacitance and diode of D36 absorption loop to absorb the spike pulse, thus effectively avoid TOP224Y chip damage caused by the peak pulse switch power supply.

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