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| Number | Title | Issue Date |
| 4449080 | Electric vehicle protection scheme A fault detection and inhibit circuit for a power control unit in an electric traction motor propelled vehicle of the type wherein the power control unit includes a chopper circuit and a bypass contactor for shunting the chopper circuit when its percent c... | 05/15/1984 |
| 4307793 | Elevator system An elevator system of the traction type having a direct current drive motor and a solid-state, dual-bridge converter power supply. Protective and monitoring apparatus reduce the probability of fuse blowing due to improper gating of a controlled rectifier ... | 12/29/1981 |
| 4150325 | Power conversion system having inversion fault detection and correction circuit A system, for supplying electrical power from a source to a load, of the type employing phase controlled rectifiers for controlling the power from a polyphase source to the load includes circuitry to detect the existence of a rectifier which is conducting... | 04/17/1979 |
| 4030018 | Power converter system A power converter system for converting an AC voltage into a DC voltage, comprising a transformer means provided with a primary winding connected to an AC power source and a secondary winding divided into a plurality of sets of coils; and rectifier means ... | 06/14/1977 |
| 4016468 | Controlled rectifier motor drive system including d.c. fault detection and commutation means A motor control system of the type employing phase controlled rectifiers for controlling the power supplied from a polyphase alternating current source to a direct current motor includes circuitry to detect the existence of a rectifier which is conducting... | 04/05/1977 |
| 3940680 | A.C. - D.C. power converter for D.C. load A power converter which can operate with both a D.C. power source and an A.C. power source for supplying electric power to a D.C. load such as a D.C. motor. The power converter comprises thyristors, a diode, a reactor and a capacitor. A plurality of serie... | 02/24/1976 |
