Motor drive circuit and motor drive system using the circuit thereof
US5289089A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 21, 1992 |
| Grant date | Feb 22, 1994 |
| Priority date | — |
| Expiry date | May 21, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor drive circuit comprising, an amplifier which receives output signals of a Hall element for determining the phase of the rotor in a single phase DC motor and outputs the same after amplification; a drive signal generating circuit which receives the amplified signals of the amplifier, generates first and second pulses each having a duty of about 50% of which phases differ by about 180.degree. and outputs the same; a first drive circuit connected to a first terminal of the single phase DC motor and a second drive circuit connected to a second terminal of the single phase DC motor. The first and second drive circuits each including, a first transistor circuit which supplies a current to the single phase DC motor, a second transistor circuit which sinks a current from the single phase DC motor; and a diode which bypasses a current flown out from the single phase DC motor toward a power source line side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.