Mainframe of medical communication calling device

Abstract

The invention relates to a mainframe of a medical communication calling device and belongs to the field of hospital nursing communication systems. The mainframe comprises a casing and is characterized in that a central processing unit (CPU), a polarity driving circuit and a high-power output circuit are arranged in the casing. An output end of the CPU is connected with an input end of the polarity driving circuit, an output end of the polarity driving circuit is connected with the high-power output circuit, and an output end of the high-power output circuit is connected with a two-wire system bus. The CPU outputs a data signal, the data signal is driven by the polarity driving circuit to switch on or switch off the high-power output circuit, a current direction of the two-wire system bus is converted by alternately opening and closing a two-way switch so as to send command data to an extension, and simultaneously high-voltage large current is output to the bus to supply power to the extension. The mainframe can provide power output with the high-voltage large current, an amplifier or a power source does not need adding additionally, the bus is strong in power supply capability and long in transmission distance, the speed in sending the command data is extremely quick, and the signals are stable. The mainframe can be widely applied to hospital ward communication calling and hospital queuing and calling systems.

Description

technical field [0001] The invention provides a host of medical communication calling equipment, which belongs to the field of hospital nursing communication systems, and is specifically applied to a communication calling system between patients and nurses in a hospital ward, and a hospital queuing and calling system. Background technique [0002] The two-wire bus has been recognized by the majority of users because of its advantages of less wiring, simple wiring, convenient installation, and easy maintenance; however, the existing technology has its shortcomings, mainly because of the power supply capacity of the host. The power is small, which is acceptable; but now extensions generally have LCD screens, which require more and more power, and many of them are realized by adding an external power supply or amplifier, which reduces the stability of the system and increases the difficulty of wiring. The cost is also relatively increased. [0003] The patent No. ZL20102012530...

AI Technical Summary

Problems solved by technology

[0004] The above patents use a two-wire power supply, and this patent sends data at a fast speed; however, the power amplifier is used to supply power to the extension, which limits the use of the device in the case of increased load; resulting in insufficient power supply capacity of the host, weak load capacity, or through the power amplifier. Amplifier, or by adding a power supply, which increases the complexity of the system and increases the difficulty of installation and maintenance; and the host uses a plus or minus 15V power supply, which is not easy to expand to other voltage power supplies

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