公开(公告)号：US20240304403A1

公开(公告)日：2024-09-12

申请号：US18119903

申请日：2023-03-10

Applicant: EATON INTELLIGENT POWER LIMITED

Inventor： Harish Gode ,  David Walter Brooking ,  Theodore James Miller ,  Sapana Darekar

IPC: H01H47/32 ,  H01H47/00

CPC classification number: H01H47/325 ,  H01H47/002

Abstract: A solenoid driver circuit for a circuit breaker is provided. The circuit breaker includes a control circuit, a solenoid and secondary contacts and is structured to be coupled between a power source and a load. The solenoid driver circuit includes a first switch coupled to a solenoid and a first resistor structured to sense solenoid current; a second switch coupled to a second resistor, the second switch structured to be turned on based on a switch drive signal from the control circuit; one pulse width modulation (PWM) current controller coupled to the control circuit, the first switch, the second switch and the first resistor, the one PWM current controller structured to adjust the solenoid current and drive the solenoid to open or close the secondary contacts using a plurality of peak solenoid current limits including a first peak solenoid current limit and a second peak solenoid current limit.

公开(公告)号：US20250070544A1

公开(公告)日：2025-02-27

申请号：US18237216

申请日：2023-08-23

Applicant: EATON INTELLIGENT POWER LIMITED

Inventor： Michael Thomas Martin ,  Theodore James Miller ,  David Walter Brooking

IPC: H02H3/08 ,  H01H47/22 ,  H01H50/18 ,  H01H50/54 ,  H02H1/00

Abstract: A remotely operated circuit interrupter includes: primary separable contacts coupled to an operating mechanism and a thermal-magnetic trip device structured to interrupt current from flowing to loads by opening the primary separable contacts during a fault event; and a fault current tolerant secondary switching mechanism including secondary separable contacts coupled to the primary separable contacts in series, Rogowski coils, a di/dt measurement circuit, a secondary solenoid driver, the Rogowski coils structured to continuously sense a rate (di/dt) of change of load current, the di/dt measurement circuit structured to receive a signal including the sensed di/dt, determine that the sensed di/dt has reached or exceeded a threshold current rate of change, and output a fault signal to the secondary solenoid driver based on the determination, the secondary solenoid driver structured to actuate the solenoids to fully open the secondary separable contacts using arc voltages of the primary and secondary contacts.