Power supply switching circuit and power supply switching system

Abstract

The invention discloses a power supply switching circuit and a power supply switching system. The power supply switching circuit comprises a first protection unit, a second protection unit, a switching unit and a comparison unit, the input end of the first protection unit is connected with a main power supply, and the output end of the first protection unit is separately connected with the input end of the switching unit and the input end of the comparison unit. The input end of the second protection unit is connected with a standby power supply, the output end of the second protection unit isseparately connected with the input end of the switching unit and the input end of the comparison unit, the output end of the switching unit is connected with a to-be-powered device, and the output end of the comparison unit is connected with the input end of the switching unit. According to the power supply switching circuit, the comparison unit can know the working conditions of the main powersupply and the standby power supply, if the main power supply works abnormally, the comparison unit outputs the control signal to the switching unit, and the switching unit switches to the standby power supply for power supply, so that the normal power supply is ensured, and the power supply stability is improved.

Description

technical field [0001] The invention relates to the technical field of power supply circuits, in particular to a power supply switching circuit and a power supply switching system. Background technique [0002] Optical workstations are often used in broadcasting, television, communications and other fields. In hybrid fiber-coaxial networks, optical workstations are used to complete the conversion of bidirectional optical and electrical signals from the front end to users, providing users with high-quality TV, radio and data signals. [0003] Existing optical workstations generally use only one power supply for power supply during the working process, and one power supply provides stable working voltage for multiple master controllers at the same time, and one master controller controls multiple optical workstations at the same time; assuming the power supply When the power supply fails to supply power to the optical workstation due to problems such as damage, it will cause m...

AI Technical Summary

Problems solved by technology

[0003] Existing optical workstations generally use only one power supply for power supply during the working process, and one power supply provides stable working voltage for multiple master controllers at the same time, and one master controller controls multiple optical workstations at the same time; assuming the power supply When the power supply is damaged and cannot supply power to the optical workstation, it will cause multiple users to be unable to perform network communication or watch TV normally, which reduces the user experience

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