公开(公告)号：US4065802A

公开(公告)日：1977-12-27

申请号：US661991

申请日：1976-02-27

Applicant: Takumi Mizukawa ,  Masatatsu Nakamura ,  Kouzi Funakoshi ,  Hideyuki Kominami

Inventor： Takumi Mizukawa ,  Masatatsu Nakamura ,  Kouzi Funakoshi ,  Hideyuki Kominami

IPC: H02H7/127 ,  H02M7/515 ,  H02M7/523 ,  H02M7/525 ,  H05B6/06 ,  H05B6/12 ,  H02H7/122

CPC classification number: H05B6/062 ,  H02H7/127 ,  H02M7/523 ,  H02M7/525

Abstract: A protection device for a thyristor inverter circuit of an induction heating cooking oven wherein commutation failure of a thyristor is detected by determining that the conduction period of the thyristor is outside a predetermined period or that a voltage applied to the thyristor is outside of a predetermined magnitude. The protection device deactuates the inverter to prevent breakdown of the thyristor and reduces the number of operations of the circuit breaker which is a final protection device. Additionally provided are linked switch actuator apparatus for placing a switch for actuating a thyristor control circuit in a state in which it is always actuated in advance of the actuation of a switch for a heating coil in order to prevent occurrance of a transient high voltage due to the switching of an inductive load in the inverter circuit, and an overheating protection circuit for detecting an abnormal temperature rise of the heating coil and an abnormal load condition to deactuate the inverter.

Abstract translation: 一种用于感应加热烹饪炉的晶闸管逆变器电路的保护装置，其中通过确定晶闸管的导通周期在预定周期之外或施加到晶闸管的电压超出预定量值来检测晶闸管的换向故障 。 保护装置使变频器停用，以防止晶闸管故障，并减少作为最终保护装置的断路器的操作次数。 另外提供了用于放置用于致动晶闸管控制电路的开关的连接开关致动器装置，其处于在用于加热线圈的开关的致动之前总是被致动的状态，以便防止由于 逆变器电路中的感性负载的切换，以及用于检测加热线圈的异常升温的过热保护电路和异常负载状态，以使逆变器停止。