Dual power supply switching control circuit based on 555 timer

Abstract

The invention relates to the technical field of dual power supply output control circuits, in particular to a dual power supply switching control circuit with a high electrical interlocking requirement based on a 555 timer. The dual power supply switching control circuit based on the 555 timer adopts the technical scheme that the dual power supply switching control circuit based on the 555 timer is characterized by comprising a relay and 555 timer power supply circuit, a common power supply sampling circuit, an emergency power supply sampling circuit, a sampling signal processing circuit, an interlocking switching signal output circuit and a switching control circuit. With the adoption of the scheme, the novel dual power supply switching control circuit based on the 555 timer overcomes the defects existing in the prior art, and is simple in route, reliable in detection judgment, reliable in control and good in anti-interference effect.

Description

technical field [0001] The invention relates to the technical field of a dual power supply output control circuit, in particular to a dual power supply conversion control circuit based on a 555 timer with higher electrical interlock requirements. Background technique [0002] In some application occasions of dual power conversion control, the execution unit is mostly driven by electromagnet or single-phase asynchronous motor. If the product vibrates back and forth, it cannot be converted normally; if it is an electromagnet operating mechanism, it may seriously cause an electrical accident in which the two power supplies are switched on at the same time. Contents of the invention [0003] Aiming at the deficiencies in the prior art, the present invention provides a new dual power conversion control circuit based on a 555 timer with simple circuit, reliable detection and judgment, reliable control and good anti-interference effect. [0004] To achieve the above object, the ...

AI Technical Summary

Problems solved by technology

[0002] In some applications of dual power conversion control, the execution unit is mostly driven by an electromagnet or a single-phase asynchronous motor. Although the product structure will be designed with a corresponding mechanical interlock, if there is a fault in the simultaneous output of two power supply signals, it will be easy. If the product vibrates back and forth, it cannot be converted normally; if it is an electromagnet operating mechanism, it may seriously cause an electrical accident in which the two power sources are closed at the same time.

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