Low-voltage direct-current redundant power supply control system

Abstract

The invention provides a low-voltage direct-current redundant power supply control system, and the system comprises a transformer T1, a rectifying circuit Z1, a main power supply circuit, a storage battery BAT, a storage battery charging management circuit, a storage battery switching control circuit, a first relay, a second relay and a storage battery reverse connection detection control circuit. A normally-closed switch K1 of the first relay is arranged in a power-on loop of a primary winding of the transformer T1, a normally-closed switch K2 of the second relay is arranged between a secondary winding of the transformer T1 and the ground, and the storage battery reverse connection detection control circuit is used for detecting whether the storage battery is reversely connected or not and controlling the first relay and the second relay to be disconnected; the positive output end of a secondary winding of the transformer T1 is connected with the input end of the rectifying circuit Z1, the output end of the rectifying circuit Z1 is connected with the input end of the main power supply circuit, and the output end of the main power supply circuit supplies power to a load; the input end of the storage battery switching control circuit is connected to the positive electrode of the storage battery BAT, the output end of the storage battery switching control circuit supplies power to a load, and the control input end of the storage battery switching control circuit is connected with the detection output end of the main power supply circuit.

Description

technical field [0001] The invention relates to a power supply control system, in particular to a low-voltage DC redundant power supply control system. Background technique [0002] In DC power supply, a transformer is generally used to step down and rectify the mains power and provide it to the subsequent load. However, there are unstable states in the power supply process of the mains power, such as overvoltage, power failure, etc. In this case It is necessary to implement overvoltage protection to switch the power supply of the mains. However, after the cut-off, for example, sensors in the Internet of Things need to collect continuous data in real time. Once the power supply is interrupted, it will cause data interruption, which will affect the monitoring and control of the Internet of Things. Existing In technology, batteries and mains power are often used to form redundant power supply. However, the existing battery-based redundant power supply control system often has ...

AI Technical Summary

Problems solved by technology

[0002] In DC power supply, a transformer is generally used to step down and rectify the mains power and provide it to the subsequent load. However, there are unstable states in the power supply process of the mains power, such as overvoltage, power failure, etc. In this case It is necessary to implement overvoltage protection to switch the power supply of the mains. However, after the cut-off, for example, sensors in the Internet of Things need to collect continuous data in real time. Once the power supply is interrupted, it will cause data interruption, which will affect the monitoring and control of the Internet of Things. Existing In technology, batteries and mains power are often used to form redundant power supply. However, the existing battery-based redundant power supply control system often has complex circuit structures, and there is a phenomenon of switching lock, which cannot automatically complete the conversion of batteries and mains power. Although there are Circuits that can be converted, but these circuits often rely on control chips, and their circuit structures are complex

[0003] On the other hand, as a part of the redundant power supply system, the battery often has the risk of reverse connection. The reverse connection of the battery cannot make the whole system work normally, and the high voltage when it is powered on will reversely impact the secondary winding of the transformer. A high self-inductance electromotive force is generated in the secondary winding, which causes the secondary winding to burn out, and even endangers the subsequent circuit, resulting in damage to the entire system.

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