公开(公告)号：US3896346A

公开(公告)日：1975-07-22

申请号：US37795673

申请日：1973-07-10

Applicant: ELECTRONIC CAMSHAFT CORP

Inventor： ULE LOUIS A

IPC: F02D41/20 ,  H01H47/32

CPC classification number: H01H47/325 ,  F02D41/20 ,  F02D2041/201 ,  F02D2041/2017 ,  F02D2041/2058

Abstract: A solid state electrical switching circuit of high efficiency is employed to increase the speed with which an electromagnet operated device, such as a relay or a hydraulic valve, can be actuated without increasing the power required to maintain the device in the actuated state. The circuit can also be made to provide the momentary increased electrical current required to obtain a given mechanical force when the magnetic gap between the solenoid core and the movable pole piece is open. Both actuation and de-actuation speed of the electromagnet are increased and rapid deactuation is achieved either by a high reverse voltage applied to the solenoid and the return of its energy to the power source or by a diode and capacitor network which transfers the magnetic energy to a second solenoid which thereupon becomes energized.