专利名称：CONTROL CIRCUITS FOR AN ELECTRIC
TRACTOR
发明人：WILLIAM B. MASON,DOUGLAS R. HOUST申请号：US3649896D申请日：19700212公开号：US3649896A公开日：19720314
摘要：The main current conduction path of a controlled rectifier and a startingnetwork therefore are connected in parallel across a source of unidirectional potentialthrough a single pole, double throw switch. With the switch in the start position with thepole engaging one contact the starting network is connected in circuit with the source ofoperating potential and in the other position with the pole engaging the other contact,circuit is completed through the controlled rectifier. The triggering voltage developedby the starting network decays rapidly with time the starting network is out of circuit.Accordingly, after conduction has been established in the controlled rectifier by switchingthe pole of the switch from the start to the operate position, should conduction beinterrupted by a safety switch in the main conduction circuit of the controlled rectifierconduction cannot be reestablished therein by simply closing the safety switch butrequires the return of the single pole, double throw switch to the start position toestablish triggering potential for the controlled rectifier.
申请人：GENERAL ELECTRIC CO.
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