Medical communication call equipment host

Abstract

The invention discloses a medical communication calling device mainframe, and belongs to the field of nursing communication systems for a hospital. The medical communication calling device mainframe comprises a shell and is characterized in that a phone module, a sound signal power amplifying circuit, a sound signal coupling circuit and a transformer DC magnetic bias bucking circuit are arranged inside the shell; sound signals pass through the sound signal power amplifying circuit and are coupled to a two-wire system bus through a voice frequency coupling transformer, and the sound signals are sent to extension set terminals through the two-wire system bus. According to the medical communication calling device mainframe, under the condition that a large DC load can exist on the output side of the voice frequency coupling transformer, the sound signals are smoothly coupled to the two-wire system bus, the signal distorting phenomenon caused by magnetic biasing of the voice frequency coupling transformer under the large DC load is removed, and power consumption in a standby state is extremely low. The medical communication calling device 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. Background technique [0002] The communication call system between patients and nurses in hospital wards, its 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; the traditional extension has only one indicator light, and the power consumption is very small , the implementation is relatively simple; but now extensions generally have LCD screens, the current of the bus is getting larger and larger, and the transmission of call audio signals becomes very difficult under the condition of high voltage and high current. The current common method is to reduce the current of the bus by adding an external power supply or an amplifier. This solution reduces the stability of the system, increases the difficulty ...

AI Technical Summary

Problems solved by technology

[0004] The above patents use a two-wire power supply. The audio transmission of this patent does not affect the command transmission between the host and the extension; however, the extension is powered by a power amplifier, which limits the use of the device when the load increases; resulting in the power supply capacity of the host. Insufficient, the load capacity is not strong, or by adding an 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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