Switching circuit based on priorities and multi-path power supply swtiching system containing same

Abstract

The invention discloses a commutation circuit based on priorities, which comprises a plurality of switch units, wherein each switch unit has a preset priority different from that of other switch units. Each switch unit comprises a switch tube connected between one of a plurality of power supplies and a power bus in series, connected with an external control device and used for receiving a control signal from the external control device so as to control the switching-on and the switching-off of the switch tubes, wherein the power supplies and the switch units are in one-to-one correspondence. Priority control lines are led out between the switch tubes of the switch units with relatively higher priorities in the switch units and the power bus and connected to the position of the switch tube of each switch unit with relatively lower priority.

Description

technical field [0001] The present invention relates to a multi-channel power switching system, more particularly, relates to a multi-channel power switching system configured with a priority-based switching circuit. Background technique [0002] The power supply system of medical electrical equipment such as ventilator and anesthesia machine often needs a backup power supply, so there are usually two or more input power supplies. [0003] Usually AC (220V) is used as the main power supply mode, and the built-in battery power supply is used as the backup power supply mode. Among them, the AC power supply has a higher priority. When the AC power is cut off, the battery starts to supply power, and when the AC is normal, the AC power supply is restored. [0004] In order to improve safety and adaptability, some ventilators can also use an external battery as a backup power supply, so that there will be three power supplies, and there will be a certain level of power supply prio...

AI Technical Summary

Problems solved by technology

In this way, when the external battery is exhausted, the automatic switching power supply of the internal battery cannot be realized, and it is not a real three-way automatic switching circuit.

[0007] Another three-way switching method is often completed by relay interlocking, but it cannot realize accurate voltage judgment before making priority judgment. Due to the use of contact relays, the response time is slow, arcing will occur, the life is short, and there is mechanical noise and other shortcomings

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