Low frequency drive control circuit and method for driving an inductive load
US8698440B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 27, 2010 |
| Grant date | Apr 15, 2014 |
| Priority date | — |
| Expiry date | Nov 17, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P7/29
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
According to one embodiment, a low frequency drive control circuit for use with an inductive load comprises a comparator configured to receive a high frequency signal at a first input and a smoothly varying low frequency signal for modulating the high frequency signal at a second input. The comparator is further configured to produce a pulse width modulated output of the low frequency drive control circuit for use in generating a smoothly varying low frequency load current in the inductive load. In one embodiment, the inductive load can comprise a DC brushed motor. In one embodiment, the low frequency drive control circuit can be implemented as part of an integrated circuit further comprising a switching circuit configured to use the pulse width modulated output of the comparator to generate the smoothly varying low frequency load current, which may be a substantially sinusoidal load current, for example.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.