Miniaturized heavy-load solid-state relay

Abstract

The invention provides a miniaturized heavy-load solid-state relay, which comprises a tube shell, an inner ceramic chip and a driving circuit, and is characterized in that the driving circuit is provided with a light-emitting diode D1 and a photovoltaic V1 to form a driving control circuit, and the driving control circuit is isolated through light; a triode Q1, a capacitor C1 and a switching diodes D4 and D5 form an amplification charging circuit; the switching diode D3 and the photovoltaic V1 form a bleeder circuit; MOS chips V2 and V3 form a switching circuit; components are each of a surface-mounted structure and are interconnected by using a bonding process; the tube shell and the inner ceramic chip are each provided with a plurality of electrode bonding pads; the light-emitting diode D1 and the switching diode D2 are respectively and fixedly attached to the electrode bonding pads of the inner ceramic chip; the other components are respectively and fixedly attached to the electrode bonding pads of the tube shell; the inner ceramic chip is buckled on the tube shell; and the light-emitting diode D1 is aligned with the photovoltaic V1. According to the miniaturized heavy-load solid-state relay provided by the invention, by designing the rapid charging and discharging circuit, the product size is reduced, and meanwhile, the driving capability of the relay is improved.

Description

technical field [0001] The invention belongs to the technical field of relays, and in particular relates to a solid-state relay with miniaturization and large load. Background technique [0002] For a relay, a relay is a switch with input and output isolation. Generally speaking, small size and load capacity are the goals that relays are constantly pursuing. Now, the smallest type of relay is the optical MOS relay packaged in ceramics. To increase its load capacity, its driving capacity must be improved. Only when the driving capacity is improved can it provide protection for large loads. Nowadays, conventional optical MOS relays use photovoltaics to drive MOS chips. For example, a solid relay provided by a Chinese patent with a publication number of CN103516343A is difficult to drive a large-load MOS chip due to the weak driving ability of photovoltaics. Because the MOS chip with a large load has a large junction capacitance, and the photovoltaic drive current is small. ...

AI Technical Summary

Problems solved by technology

Nowadays, conventional optical MOS relays use photovoltaics to drive MOS chips. For example, a solid relay provided by a Chinese patent with a publication number of CN103516343A is difficult to drive a large-load MOS chip due to the weak driving ability of photovoltaics. Because the MOS chip with a large load has a large junction capacitance, and the photovoltaic drive current is small

If you want to improve its driving ability, you generally need to improve its driving ability through a driving circuit, such as an optical coupling device provided by a Chinese patent with a publication number of CN101872761A, which achieves improving driving ability by connecting multiple light-receiving elements (photovoltaics) in parallel However, this kind of parallel connection is very limited, because the driving current of the light-receiving element is generally several microamperes to tens of microamperes. If it is necessary to drive a large load, it cannot meet the requirements, and after multiple parallel connections, its volume is bound to increase. Can not meet the needs of miniaturization and large load

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