-
公开(公告)号：US20220293372A1
公开(公告)日：2022-09-15
申请号：US17632308
申请日：2020-10-05
摘要： A coil drive device energizes an operation coil to close an electromagnetic contactor. A rectifier outputs, to a power supply line, an input voltage obtained by full-wave rectification of an AC voltage supplied from a main power source. A controller controls on and off of a switching element connected to a power supply line in series with the operation coil. The controller controls a duty ratio that is an on period ratio of the switching element in each switching period in accordance with a value of a parameter calculated from a detected value of the input voltage, in at least a partial period after start of energization of the operation coil in response to a close command for the electromagnetic contactor.
-
公开(公告)号：US20200219691A1
公开(公告)日：2020-07-09
申请号：US16649992
申请日：2017-12-01
IPC分类号： H01H71/24
摘要： A contactor includes a fixed iron core, a movable iron core, an operation coil, a first crossbar, a tripping spring, and a second crossbar. The contactor includes a push spring to push a movable contact toward a fixed contact, a trip coil connected to the fixed contact, and a plunger that is operated by an electromagnetic force generated in the trip coil when a current of a predetermined value or higher flows through the trip coil. The contactor includes an opening lever to push the second crossbar in a direction away from the first crossbar in conjunction with the operation of the plunger.
-
公开(公告)号：US20170288388A1
公开(公告)日：2017-10-05
申请号：US15513858
申请日：2015-06-05
CPC分类号： H02H3/087 , H01H9/54 , H01H33/59 , H01H33/596 , H01H33/6661 , H01H77/02
摘要： A DC circuit breaker includes: a mechanical switch provided on an electrical path through which a direct current flows; and a semiconductor switch connected in parallel with the mechanical switch. The mechanical switch includes a gas disconnector and a vacuum circuit breaker connected in series. Normally, the direct current flows through the mechanical switch. When interrupting the direct current, the vacuum circuit breaker is made nonconductive to allow the direct current to be commutated to the semiconductor switch, and subsequently the gas disconnector and the semiconductor switch are made nonconductive. A vacuum circuit breaker having a low withstand voltage can be used.
-
-
搜索结果
3 条记录 (耗时 0.013 秒)
