Schneider Electric Sa

Telemecanique

Manuel Lima

Alain Gousset

Karim Benkaroun

Pierre Boudet

Frederic Noirot

A power supply circuit, using direct current or rectified alternating current sources having output and return supply lines (a, b), for a coil of an electromagnet having at least one principal winding (B1) and a secondary winding (B2). The power supply circuit includes a first semiconductor element (T2) having a gate and a source drain path and capable of providing or blocking a supply of current to the secondary winding (B2), the source drain path connected between the secondary winding (B2) and the return supply line (b); and a switching means (10) connected between the primary winding (B1) and the gate of the first semiconductor element (T2). The switching means (10) includes a second semiconductor element (T1) having a gate and a source drain path and capable of keeping the first semiconductor element (T2) from conducting when a voltage between the gate of the second semiconductor element (T1) and the return supply line (b) reaches a threshold voltage (Vs) greater than a value (V1) corresponding to a start of a closing of the electromagnet, the source drain path of the second semiconductor element (T1) connected between the gate of the first semiconductor element (T2) and the return supply line (b), and an adaptation circuit connected between the primary winding (B1) and the gate of the second semiconductor element (T1).

Power supply circuit of an excitation coil of an electromagnet

A thermal relay is disclosed which can be remotely re-set and/or tripped by means of remote control electromagnets. The case of the relay has second fixing means adapted to receive first fixing means belonging to one and the same electromagnet can in which an extension of the core or plate is orientable so as to come opposite each of the re-setting and testing pushers placed on the front face of the relay.

Growing community of inventors

Paris, France

Manuel Lima