A COIL ACTUATOR FOR LOW AND MEDIUM VOLTAGE APPLICATIONS

• Main Authors: Testa, Marco, Usai, Roberto
• Format: Patent
• Language: English; French; German
• Published: 01.04.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; INDUCTANCES; MAGNETS; RELAYS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SELECTORS; TRANSFORMERS

A coil actuator (1) for low and medium voltage applications comprising:- a coil electromagnet (2) having a single coil winding (21) and a movable member (22); and- a power and control unit (3) comprising:- a power circuit (4) operatively coupled with said coil electromagnet, said power circuit comprising input terminals (T1, T2) for receiving an input voltage (VIN) and an intermediate node (T3), said electromagnet being electrically connected with said input terminal (T1) and said intermediate node (T3), said power circuit further comprising a discharge circuit (42), which is electrically connected with said first input terminal (T1) and said intermediate node (T3) in parallel with said coil winding (21), and a switch circuit (41), which is electrically connected with said intermediate node (T3) and said second input terminal (T2), said switch circuit comprising at least a power switch (410);- a controller (6) operatively coupled with said power circuit (4) to drive said at least a power switch (410) to control of an input current (IIN) circulating through said power circuit (4), said controller being adapted to perform a PWM control of said input current (IIN) to operate said coil electromagnet (2);- a power supply circuit (10) adapted to feed said controller (6).Said power supply circuit (10) is electrically connected with said intermediate node (T3) and said controller (6).