The embodiment of the invention provides a switching circuit for a frequency converter, frequency conversion equipment and a crane, and the switching circuit comprises a change-over switch which comprises a movable end, a first static contact and a second static contact, and the movable end is used for being connected with a first power supply; the first contactor comprises a first coil and a first normally-closed auxiliary contact; the second contactor comprises a second coil and a second normally-closed auxiliary contact; the first end of the second normally-closed auxiliary contact is electrically connected with the first static contact, the second end of the second normally-closed auxiliary contact is electrically connected with the first end of the first coil, and the second end of the first coil is electrically connected to a first common reference potential end; the first end of the first normally-closed auxiliary contact is electrically connected with the second static contact, the second end of the first normally-closed auxiliary contact is electrically connected with the first end of the second coil, and the second end of the second coil is electrically connected to the first common reference potential end. According to the embodiment of the invention, the reliability, the intelligent degree and the operation safety of the electric control system can be improved.
本发明实施例提供一种用于变频器的开关电路、变频设备和起重机,所述开关电路包括:切换开关,包括动端、第一静触点和第二静触点,动端用于接入第一电源;第一接触器,包括第一线圈和第一常闭辅助触点;以及第二接触器,包括第二线圈和第二常闭辅助触点;第二常闭辅助触点的第一端与第一静触点电连接,第二常闭辅助触点的第二端与第一线圈的第一端电连接,第一线圈的第二端电连接到第一公共参考电位端;第一常闭辅助触点的第一端与第二静触点电连接,第一常闭辅助触点的第二端与第二线圈的第一端电连接,第二线圈的第二端电连接到第一公共参考电位端。本发明实施例可以提高电控系统的可靠性、智能化程度和操作安全性。
Switching circuit for frequency converter, frequency conversion equipment and crane
用于变频器的开关电路、变频设备和起重机
2022-03-01
Patent
Electronic Resource
Chinese
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B66C Krane , CRANES / H02P CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS , Steuern oder Regeln von elektrischen Motoren, elektrischen Generatoren, dynamoelektrischen Umformern |
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