Drive control device for direct current motor, rotation drive system for direct current motor and semiconductor integrated circuit for driving coil
US7119508B2 · kind B2 · utility
17Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2004 |
| Grant date | Oct 10, 2006 |
| Priority date | — |
| Expiry date | Sep 27, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A dc motor drive system with a PWM control system permits a high-accuracy rotation drive control while detecting the currents flowing into the coils without using shunt resistors. The system drives output MOS transistors by the PWM control to make the currents flow into the coils, and drives to rotate the dc motor. The system includes current sensing MOS transistors having a predetermined size ratio 1/m (M>1) to the output MOS transistors that make the currents flow into the coils. The current sensing MOS transistors are capable of making flow reduced currents proportional to the currents of the output MOS transistors.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.