A power supply for a cascaded bus

Abstract

The invention belongs to the technical field of switching power supply and discloses a supply device of cascaded bus power supply, which comprises a rectifying filter circuit, a power factor correction circuit and a resonant DC / DC isolation conversion circuit. The supply device comprises a rectifying filter circuit, a power factor correction circuit and a resonant DC / DC isolation conversion circuit. It also includes fan control circuit and active alarm circuit. The fan control circuit includes a DC power supply for supplying power to the fan, a first transistor for controlling the current magnitude of the DC power supply to the fan, and a base current control circuit for controlling the current magnitude of the base of the first transistor according to the ambient temperature. The active alarm circuit comprises an alarm, a switch for controlling the alarm to be disconnected or connected from the DC power supply, and a switch control circuit for controlling the switch to be opened or closed according to the PWM signal of the resonant DC / DC isolation conversion circuit. The invention makes the fan start and stop and the speed change according to the ambient temperature, thereby prolonging the service life of the fan. In the event of failure of the supply, it can be quickly located, which greatly facilitates troubleshooting.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a cascaded bus power supply. Background technique [0002] Power supply is an important part of various electronic equipment, it is like the heart of the human body, providing power for the normal operation of all electrical equipment. With the rapid development of various electronic equipment and electrical appliances, there is a great demand for high-quality power supplies with high efficiency and stable performance. The switching power supply is widely used in almost all electronic equipment due to its small size, light weight and high efficiency. It is an indispensable power supply method for the rapid development of today's electronic information industry. However, in power systems such as space stations, base stations, and computer servers that require high-power, high-precision uninterrupted power supply, a single switching power supply can no...

AI Technical Summary

Problems solved by technology

[0003] However, the single switching power supply in the existing high-power distributed power supply does not have a fault alarm function, and it is extremely inconvenient to troubleshoot after it fails; moreover, the fan of each switching power supply cannot be started or stopped according to changes in the ambient temperature. Speed ​​regulation, greatly shortening the service life of the fan

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