Drive apparatus for driving an oscillator and a powder feeder having the drive apparatus therein
US6050393A · kind A · utility
57Cited by
5References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 30, 1997 |
| Grant date | Apr 18, 2000 |
| Priority date | — |
| Expiry date | Sep 30, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S331/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Disclosed is the drive apparatus for the powder feeder, which has; the duty ratio control circuit 12 which applies the alternating voltage with the resonance frequency to the vibrator 10 during a time corresponding to the duty ratio; the current monitor 15 which detects the residual frequency of the electro motive force produced due to the residual oscillation of the vibrator 10 when the alternating voltage with the resonance frequency is not applied from the duty ratio control circuit 12 and feeds back the detected residual frequency to the PLL control circuit 11 through the zero-cross comparator 17.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.