Motor drive circuit
US5142433A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1990 |
| Grant date | Aug 25, 1992 |
| Priority date | — |
| Expiry date | Aug 15, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H9/047
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor drive circuit comprises a motor, a DC source connected to said motor, first and second switching elements turned on and off to control a current flowing to the motor having one terminal connected to a common connecting point of the first and second switching elements, and when the current flowing to the motor is stopped by the first switching element, the second switching elements is turned on to break the motor, a reverse current bypassing circuit connected to at least one of said first switching element and said second switching element for bypassing a reverse current supplied by the DC source, a reverse current blocking circuit connected to said second switching element for blocking the reverse current and a surge absorbing circuit connected to at least one of the first switching element, the second switching element and a series circuit of the second switching element and the reverse current blocking circuit for absorbing a surge generated when the first switching element is turned off in response to a locking to the motor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.