DC-motor bridge driver with end-of-braking detector
US5471122A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1993 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Sep 14, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/921
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A full-bridge driver, and especially an entirely integrated bridge driver, for driving DC motors in either direction is capable of automatically braking the motor when the motor direction is to be reversed. The bridge circuit is of "H" configuration and has four transistor switches connected in bridge configuration and has two bridge output terminals to which a motor may be connected. A differential window comparator has the input connected to the two bridge output terminals, producing a high level binary signal only when the voltage across the two output terminals is within a small voltage range centered at about zero volts. A pulse-width filter circuit having an input connected to the window comparator produces a high binary output signal only when the comparator-produced binary signal remains high for greater than a predetermined time. The effect of the pulse-width filter in combination with the window comparator is to ignore the first occurrence during braking of zero motor voltage, and to recognize the second occurrence of zero motor voltage which indicates the end of the braking period at which time the motor has stopped, after which the motor can be operated in the reverse d…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.