A power-off delay relay output circuit

Abstract

The invention discloses an off-delay type relay output circuit. The circuit comprises a control unit, an MOSFET (Metal Oxide Semiconductor Field Effect Transistor) driving optocoupler, an MOSFET shutoff optocoupler, an MOSFET driving network, an MOSFET tube and an output unit; the control unit is respectively connected with the MOSFET driving optocoupler and the MOSFET shutoff optocoupler; both the MOSFET driving optocoupler and the MOSFET shutoff optocoupler are connected with the MOSFET tube by the MOSFET driving network; and the MOSFET tube is connected with the output unit. By the circuit design adopted by the invention, a signal is controlled in an off-delay stage and an additional current does not need to be consumed for maintaining an output state, so that the energy storage requirement of a signal delay control circuit is reduced, and when a volume of the product is reduced, element cost can be reduced; and meanwhile, due to no adoption of a conventional magnetic latching relay, all the products can be packaged by using patches, a more light and thinner product size is easy to achieve, the off-delay type relay output circuit is convenient for SMT (Surface Mount Technology) production, production time is reduced, and the off-delay type relay output circuit has wide application prospect.

Description

technical field [0001] The invention relates to a relay output circuit, in particular to a power-off delay relay output circuit, belonging to the technical field of time relays in industrial control applications. Background technique [0002] In industrial control, some millisecond-level pulse control signals are inconvenient to be recognized by general-purpose controllers. In this case, the industry generally uses power-off delay relays to expand the pulse width and convert millisecond-level switching signals into second-level level signals, making it easy to be recognized by general-purpose controllers; at the same time, this This kind of power-off delay relay can also eliminate the influence of the false reversal of the output signal caused by some circuit fluctuations. [0003] In addition, since the delay module and output device of the power-off delay relay still continue to work after power-off, it is generally maintained by an energy storage capacitor, and its energ...

AI Technical Summary

Problems solved by technology

However, due to specific institutional requirements, electromagnetic relays are generally relatively large in size, and it is difficult to miniaturize the corresponding products. The cost of components is high, and there are certain limitations in application.

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