Operating apparatus for electrically driven vehicles
US3936707A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1974 |
| Grant date | Feb 3, 1976 |
| Priority date | — |
| Expiry date | Feb 12, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/72
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An operating apparatus for electrically driven vehicle, for example a fork lift truck, of the type that has an electric motor connected to a DC source via a chopper circuit. The apparatus includes a relay for supplying DC power to said motor, a switching element for operating the relay and a transistorized detector circuit pararelly connected to said switching element which sense the normal operation of the chopper circuit, and makes the switching element non-conductive in the event of malfunctioning. Further, the apparatus includes a chopper control circuit for controlling the chopper circuit effectively and a overcurrent detector circuit for control chopper current by detecting the overcurrent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.