Drive apparatus for PWM control of two inductive loads with reduced generation of electrical noise
US6891342B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 2003 |
| Grant date | May 10, 2005 |
| Priority date | — |
| Expiry date | Oct 17, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1555
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive apparatus for driving two motors by PWM control of respective switching elements connected to the motors, whereby respective control signals are applied to the switching elements such that each commencement of a transition of one of the switching elements from the non-conducting to the conducting state coincides with the termination of a transition of the other switching element from the conducting to the non-conducting state, thereby reducing generated electrical noise, and for supplying equivalent values of drive voltage to two motors of different power ratings which rotate respective cooling fans, to obtain equalized levels of air flow rate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.