COIL ACTUATOR FOR LOW AND MEDIUM VOLTAGE APPLICATIONS

• Main Authors: Testa, Marco, Usai, Roberto
• Format: Patent
• Language: English
• Published: 02.04.2020
• Subjects: BASIC ELECTRIC ELEMENTS; BASIC ELECTRONIC CIRCUITRY; ELECTRIC SWITCHES; ELECTRICITY; EMERGENCY PROTECTIVE DEVICES; INDUCTANCES; MAGNETS; PULSE TECHNIQUE; RELAYS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SELECTORS; TRANSFORMERS

A coil actuator for low and medium voltage applications including: a coil electromagnet having a single coil winding and a movable member; and a power and control unit including: a power circuit operatively coupled with the coil electromagnet, the power circuit including input terminals for receiving an input voltage and an intermediate node, the electromagnet being electrically connected with the input terminal and the intermediate node, the power circuit further including a discharge circuit, which is electrically connected with the first input terminal and the intermediate node in parallel with the coil winding, and a switch circuit, which is electrically connected with the intermediate node and the second input terminal, the switch circuit including at least a power switch; a controller operatively coupled with the power circuit to drive the at least a power switch to control of an input current circulating through the power circuit, the controller being adapted to perform a PWM control of the input current to operate the coil electromagnet; a power supply circuit adapted to feed the controller. The power supply circuit is electrically connected with the intermediate node and the controller.