Hybrid relay

Details Hybrid relay Hybrid relay

1990-03-14

1991-10-01

DeBoer, Todd E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Arc suppression at switching point

361 13, 307134, H01H 930

Patent

active

050539078

ABSTRACT:
A hybrid relay comprising a mechanical relay provided with mechanical contact unit adapted to be actuated by an electromagnet, an electronic relay consisting of a semiconductor device, and a drive switch for supplying a drive current to the electromagnet, wherein the mechanical contact unit comprises: a first contact mechanism for controlling a load current of the hybrid relay; and a second contact mechanism for controlling a control current for a control gate of the semiconductor device; a contact point gap of the first contact mechanism being larger than that of the second contact mechanism. Thus, it is ensured that the first contact mechanism is engaged after the second contact mechanism and is disengaged before the second contact mechanism. Preferably, the mechanical contact unit further comprises a third contact mechanism, for controlling the leak current of the semiconductor device, which may be provided with a delay mechanism for delaying the returning action thereof. By maintaining the orders of engagement and disengagement of the three contact mechanisms, even when the load of the hybrid relay contains an inductive element, the generation of electric arcs in the first and third contact mechanisms is avoided. The addition of the delay mechanism simplifies the adjustment of the contact gaps of the three contact mechanisms.

REFERENCES:
patent: 4772809 (1988-09-01), Koga et al.
patent: 4802051 (1989-01-01), Kim
IEEE Transactions on Components, Hybrids, and Manufacturing, Krstic, S., et al., "Push-Button Hybrid Switch", vol. 9, No. 1, Mar. 1986, pp. 101-105.

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