| 摘要 |
<p>1,119,773. Inverters. BORG-WARNER CORP. 14 Dec., 1965 [11 Feb., 1965], No. 53096/65. Heading H2F. An inverter (one phase of which is shown in Fig. 6) having a pair of semi-conductor switches 22, 23 connected in series with commutating inductances 27, 28 across the D.C. lines 20, 21 has an energy return circuit for the commutating energy stored in each inductor. For inductor 28 this comprises the other inductor 27, diode 50 and a primary winding 48 of transformer 56. Energy is returned to the supply both conductively through this circuit and inductively through the transformer 56 and the rectifying circuit 51, 52 connected to its secondary winding 49. In a more practical circuit (Fig. 7) reverse current diodes 33, 34 are provided which function also as the rectifier connected to the transformer secondary winding. The capacitors 31, 32 are not commutating capacitors but store energy to ensure that when the associated semiconductor switch is turned on energy is rapidly passed to the load. In the embodiment of Fig. 9 the first transformer comprises the windings 62, 63, 64 and the windings of the commutating inductors (all wound on a common core) are extended as shown at 70, 71.</p> |
